-*- mode: org -*-
#+TITLE:       spine (doc_reform) document abstraction
#+DESCRIPTION: documents - structuring, publishing in multiple formats & search
#+FILETAGS:    :spine:abstraction:
#+AUTHOR:      Ralph Amissah
#+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
#+COPYRIGHT:   Copyright (C) 2015 - 2019 Ralph Amissah
#+LANGUAGE:    en
#+STARTUP:     indent content hideblocks hidestars
#+OPTIONS:     H:3 num:nil toc:t \n:nil @:t ::t |:t ^:nil _:nil -:t f:t *:t <:t
#+OPTIONS:     TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc
#+OPTIONS:     author:nil email:nil creator:nil timestamp:nil
#+PROPERTY:    header-args :padline no :exports code :cache no :noweb yes
#+EXPORT_SELECT_TAGS:  export
#+EXPORT_EXCLUDE_TAGS: noexport
#+TAGS: assert(a) class(c) debug(d) mixin(m) spine(s) tangle(T) template(t) WEB(W) noexport(n)

- [[./spine.org][spine]]  [[./][org/]]

* 1. Document Abstraction
Process markup document, create document abstraction.

** _module template_                                 :module:metadoc_from_src:

#+BEGIN_SRC d :tangle "../src/doc_reform/meta/metadoc_from_src.d"
/++
  document abstraction:
  abstraction of sisu markup for downstream processing
  metadoc_from_src.d
+/
module doc_reform.meta.metadoc_from_src;
template DocReformDocAbstraction() {
                                                                                /+ ↓ abstraction imports +/
  <<abs_top_imports>>
                                                                                /+ ↓ abstraction mixins +/
  <<abs_top_mixins>>
                                                                                /+ ↓ abstraction struct init +/
  <<abs_top_init_struct>>
  <<abs_inline_para_tag_associations>>
                                                                                /+ ↓ abstract marked up document +/
  auto DocReformDocAbstraction(CMM,Opt,Mf)(
    char[][]           markup_sourcefile_content,
    CMM                conf_make_meta,
    Opt                opt_action,
    Mf                 manifested,
    bool               _new_doc
  ) {
    static auto rgx = Rgx();
                                                                                /+ ↓ abstraction init +/
    <<abs_init_rest>>
                                                                                /+ abstraction init ↑ +/
    <<make_tests>>
                                                                                /+ ↓ ↻ loop markup document/text line by line +/
    srcDocLoop:
    foreach (line; markup_sourcefile_content) {                                 /+ ↓ markup document/text line by line +/
                                                                                // "line" variable can be empty but should never be null
      <<abs_in_loop_body_00>>
      if (obj_type_status["code"] == TriState.on) {
        <<abs_in_loop_body_00_code_block>>
      } else if (!matchFirst(line, rgx.skip_from_regular_parse)) {              /+ object other than "code block" object +/
                                                                                /+ (includes regular text paragraph, headings & blocks other than code) +/
                                                                                /+ heading, glossary, blurb, poem, group, block, quote, table +/
        <<abs_in_loop_body_non_code_obj>>
        } else {                                                                /+ not within a block group +/
          <<abs_in_loop_body_open_block_obj_assert>>
          if (line.matchFirst(rgx.block_open)) {
            <<abs_in_loop_body_open_block_obj>>
          } else if (!line.empty) {                                             /+ line not empty +/
                                                                                /+ non blocks (headings, paragraphs) & closed blocks +/
            <<abs_in_loop_body_not_block_obj>>
          } else if (obj_type_status["blocks"] == TriState.closing) {           /+ line empty, with blocks flag +/
            <<abs_in_loop_body_not_block_obj_line_empty_blocks_flags>>
          } else {                                                              /+ line.empty, post contents, empty variables: +/
            <<abs_in_loop_body_not_block_obj_line_empty>>
          }                                                                     // close else for line empty
        }                                                                       // close else for not the above
      }                                                                         // close after non code, other blocks or regular text
      <<abs_in_loop_body_01>>
    }                                                                           /+ ← srcDocLoop closed: loop markup document/text line by line +/
                                                                                /+ ↓ post loop markup document/text +/
    <<abs_post>>
    <<abs_post_doc_reloop_processing>>
    <<abs_struct_doc_has>>
    <<abs_return_tuple>>
                                                                                /+ post loop markup document/text ↑ +/
  }                                                                             /+ ← closed: abstract doc source +/
                                                                                /+ ↓ abstraction functions +/
  <<abs_functions_object_reset>>
  <<abs_functions_header_set_common>>
  <<abs_functions_ocn_status>>
  <<abs_functions_substitutions>>
  <<abs_functions_block>>
  <<abs_functions_block_quote>>
  <<abs_functions_block_group>>
  <<abs_functions_block_block>>
  <<abs_functions_block_poem>>
  <<abs_functions_block_code>>
  <<abs_functions_block_table>>
  <<abs_functions_block_biblio>>
  <<abs_functions_block_line_status_empty>>
  <<abs_functions_book_index>>
  <<abs_functions_heading>>
  <<abs_functions_para>>
  <<abs_functions_table>>
                                                                                /+ abstraction functions ↑ +/
                                                                                /+ ↓ abstraction function emitters +/
  <<meta_emitters_ocn>>
                                                                                /+ +/
  <<meta_emitters_obj_inline_markup_munge>>
  <<meta_emitters_obj_inline_markup>>
  <<meta_emitters_obj_inline_markup_and_anchor_tags_and_misc>>
  <<meta_emitters_obj_inline_markup_table_of_contents>>
  <<meta_emitters_obj_inline_markup_private>>
  <<meta_emitters_obj_inline_markup_heading_numbering_segment_anchor_tags>>
  <<meta_emitters_obj_inline_markup_close>>
                                                                                /+ +/
  <<meta_emitters_obj_attributes>>
  <<meta_emitters_obj_attributes_public>>
  <<meta_emitters_obj_attributes_private>>
  <<meta_emitters_obj_attributes_private_an_attribute>>
  <<meta_emitters_obj_attributes_private_json>>
  <<meta_emitters_obj_attributes_private_close>>
                                                                                /+ +/
  <<meta_emitters_book_index_nugget>>
  <<meta_emitters_book_index_report_indented>>
  <<meta_emitters_book_index_report_section>>
                                                                                /+ +/
  <<meta_emitters_endnotes>>
                                                                                /+ +/
  <<meta_emitters_bibliography>>
                                                                                /+ +/
  <<meta_emitters_metadata>>
                                                                                /+ abstraction functions emitters ↑ +/
                                                                                /+ ↓ abstraction functions assertions +/
  <<abs_functions_assertions>>
                                                                                /+ abstraction functions assertions ↑ +/
}                                                                               /+ ← closed: template DocReformDocAbstraction +/
<<template_doc_sect_keys_seq>>
#+END_SRC

** 1. _pre loop processing_                                              :pre:
*** imports                                                       :imports:
[[./meta_defaults.org][meta_defaults]]

#+name: abs_top_imports
#+BEGIN_SRC d
import doc_reform.meta;
import
  std.algorithm,
  std.container,
  std.file,
  std.json,
  std.path;
import
  doc_reform.meta.defaults,
  doc_reform.meta.object_setter,
  doc_reform.meta.rgx;
#+END_SRC

*** mixins                                                         :mixins:

#+name: abs_top_mixins
#+BEGIN_SRC d
mixin ObjectSetter;
mixin InternalMarkup;
mixin DocReformRgxInit;
#+END_SRC

*** initialize                                                 :initialize:
**** initialize general

#+name: abs_top_init_struct
#+BEGIN_SRC d
/+ initialize +/
ObjGenericComposite[] the_table_of_contents_section;
ObjGenericComposite[] the_document_head_section, the_document_body_section, the_bibliography_section, the_glossary_section, the_blurb_section;
ObjGenericComposite[] the_dom_tail_section;
string[string] an_object, processing;
string an_object_key;
string[] anchor_tags;
string anchor_tag;
string anchor_tag_;
string[string] tag_in_seg;
string lev_anchor_tag;
string[string][string] tag_assoc;
string[] lv0_to_3_tags;
/+ enum +/
enum State { off, on }
enum TriState { off, on, closing }
enum DocStructMarkupHeading {
  h_sect_A,
  h_sect_B,
  h_sect_C,
  h_sect_D,
  h_text_1,
  h_text_2,
  h_text_3,
  h_text_4,
  h_text_5, // extra level, drop
  content_non_header
} // header section A-D; header text 1-4
enum Status { off, on, }
enum OCNstatus { on, off, bkidx, closing, reset, }
enum OCN_off_block_status { off, on }
enum OCNtype { ocn, non, bkidx, }
/+ biblio variables +/
string biblio_tag_name, biblio_tag_entry, st;
string[] biblio_arr_json;
string biblio_entry_str_json;
JSONValue[] bib_arr_json;
int bib_entry;
/+ counters +/
int cntr, previous_count, previous_length;
bool reset_note_numbers=true;
int[string] line_occur;
int html_segnames_ptr=0;
int html_segnames_ptr_cntr=0;
int verse_line, heading_ptr;
/+ paragraph attributes +/
int[string] indent;
bool bullet = true;
string content_non_header = "8";
static auto obj_im = ObjInlineMarkup();
static auto obj_att = ObjAttributes();
/+ ocn +/
struct OCNset {
  int digit;
  int object_number;
  bool off;
  string identifier;
  int bkidx;
  int type;
}
OCNset obj_cite_digits;
int obj_cite_digit_, obj_cite_digit_off, obj_cite_digit_bkidx, obj_cite_digit_type;
auto object_citation_number = OCNemitter();
int[] dom_structure_markedup_tags_status         = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
int[] dom_structure_markedup_tags_status_buffer  = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
int[] dom_structure_collapsed_tags_status        = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
int[] dom_structure_collapsed_tags_status_buffer = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
enum DomTags { none, open, close, close_and_open, open_still, }
#+END_SRC

**** method heading ancestors

#+name: abs_top_init_struct
#+BEGIN_SRC d
pure ObjGenericComposite obj_heading_ancestors()(
  ObjGenericComposite  obj,
  string[]             lv_ancestors_txt,
) {
  switch (obj.metainfo.heading_lev_markup) {
  case 0:
    lv_ancestors_txt[0] = obj.text.to!string;
    foreach(k; 1..8) {
      lv_ancestors_txt[k] = "";
    }
    goto default;
  case 1:
    lv_ancestors_txt[1] = obj.text.to!string;
    foreach(k; 2..8) {
      lv_ancestors_txt[k] = "";
    }
    goto default;
  case 2:
    lv_ancestors_txt[2] = obj.text.to!string;
    foreach(k; 3..8) {
      lv_ancestors_txt[k] = "";
    }
    goto default;
  case 3:
    lv_ancestors_txt[3] = obj.text.to!string;
    foreach(k; 4..8) {
      lv_ancestors_txt[k] = "";
    }
    goto default;
  case 4:
    lv_ancestors_txt[4] = obj.text.to!string;
    foreach(k; 5..8) {
      lv_ancestors_txt[k] = "";
    }
    goto default;
  case 5:
    lv_ancestors_txt[5] = obj.text.to!string;
    foreach(k; 6..8) {
      lv_ancestors_txt[k] = "";
    }
    goto default;
  case 6:
    lv_ancestors_txt[6] = obj.text.to!string;
    lv_ancestors_txt[7] = "";
    goto default;
  case 7:
    lv_ancestors_txt[7] = obj.text.to!string;
    goto default;
  default:
    obj.tags.heading_ancestors_text = lv_ancestors_txt.dup;
  }
  return obj;
}
#+END_SRC

**** method dom markup tags

#+name: abs_top_init_struct
#+BEGIN_SRC d
pure ObjGenericComposite obj_dom_structure_set_markup_tags()(
  ObjGenericComposite  obj,
  int[]                dom,
  int                  lev
) {
  foreach (i; 0 .. 8) {
    if (i < lev) {
      if (dom[i] == DomTags.open
         || dom[i] == DomTags.close_and_open
      ) {
        dom[i] = DomTags.open_still;
      } else if (dom[i] == DomTags.close) {
        dom[i] = DomTags.none;
      }
    } else if (i == lev) {
      if (lev  == 0
        && dom[i] == DomTags.open_still
      ) {
        dom[i] = DomTags.close;
      } else if (dom[i] == DomTags.open
        || dom[i] == DomTags.open_still
        || dom[i] == DomTags.close_and_open
      ) {
        dom[i] = DomTags.close_and_open;
      } else {
        dom[i] = DomTags.open;
      }
    } else if (i > lev) {
      if (dom[i] == DomTags.close) {
        dom[i] = DomTags.none;
      } else if (dom[i] == DomTags.open
        || dom[i] == DomTags.open_still
        || dom[i] == DomTags.close_and_open
      ) {
        dom[i] = DomTags.close;
      }
    }
  }
  debug(dom_magic_numbers) {
    writeln("marked up: ", lev, ": ", dom);
  }
  obj.metainfo.dom_structure_markedup_tags_status = dom.dup;
  return obj;
}
#+END_SRC

**** method dom collapsed tags

#+name: abs_top_init_struct
#+BEGIN_SRC d
pure ObjGenericComposite obj_dom_set_collapsed_tags()(
  ObjGenericComposite  obj,
  int[]                dom,
  int                  lev
) {
  foreach (i; 0 .. 8) {
    if (i < lev) {
      if (dom[i] == DomTags.open
         || dom[i] == DomTags.close_and_open
      ) {
        dom[i] = DomTags.open_still;
      } else if (dom[i] == DomTags.close) {
        dom[i] = DomTags.none;
      }
    } else if (i == lev) {
      if (lev  == 0
        && dom[i] == DomTags.open_still
      ) {
        dom[i] = DomTags.close;
      } else if (dom[i] == DomTags.open
        || dom[i] == DomTags.open_still
        || dom[i] == DomTags.close_and_open
      ) {
        dom[i] = DomTags.close_and_open;
      } else {
        dom[i] = DomTags.open;
      }
    } else if (i > lev) {
      if (dom[i] == DomTags.close) {
        dom[i] = DomTags.none;
      } else if (dom[i] == DomTags.open
        || dom[i] == DomTags.open_still
        || dom[i] == DomTags.close_and_open
      ) {
        dom[i] = DomTags.close;
      }
    }
  }
  debug(dom_magic_numbers) {
    writeln("collapsed: ", lev, ": ", dom);
  }
  obj.metainfo.dom_structure_collapsed_tags_status = dom.dup;
  return obj;
}
#+END_SRC

**** method ocn emit

#+name: abs_top_init_struct
#+BEGIN_SRC d
static auto ocn_emit(int ocn_status_flag) {
  return object_citation_number.ocn_emitter(ocn_status_flag);
}
static auto inline_markup_faces(L)(L line) {
  static auto rgx = Rgx();
  static auto mkup = InlineMarkup();
  line = replaceAll!(m => mkup.quote_o ~ m[1] ~ mkup.quote_c)(line, rgx.within_quotes);
  line = replaceAll!(m => mkup.mono ~ mkup.ff_o ~ m["text"] ~ mkup.ff_c ~ mkup.mono)(line, rgx.inline_mark_mono);
  line = replaceAll!(m => mkup.cite ~ mkup.ff_o ~ m["text"] ~ mkup.ff_c ~ mkup.cite)(line, rgx.inline_mark_cite);
  foreach (regx; [rgx.inline_mark_emphasis, rgx.inline_mark_bold, rgx.inline_mark_underscore, rgx.inline_mark_italics, rgx.inline_mark_superscript, rgx.inline_mark_subscript, rgx.inline_mark_strike, rgx.inline_mark_insert]) {
    line = replaceAll!(m => m["mark"] ~ mkup.ff_o ~ m["text"] ~ mkup.ff_c ~ m["mark"])(line, regx);
  }
  return line;
}
static string links_and_images()(string obj_txt) {
  static auto rgx = Rgx();
  static auto mkup = InlineMarkup();
  if (obj_txt.match(rgx.smid_inline_url_generic)) {
    if (
      obj_txt.match(rgx.smid_inline_link_endnote_url_helper)
      || obj_txt.match(rgx.smid_inline_link_endnote_url_helper_punctuated)
    ) {
      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s %s%s%s%s%s%s %s%s",
        mkup.lnk_o, m["content"].strip, mkup.lnk_c,
        mkup.url_o, m["link"], mkup.url_c,
        mkup.en_a_o,
        mkup.lnk_o, m["link"].strip, mkup.lnk_c,
        mkup.url_o, m["link"], mkup.url_c,
        mkup.en_a_c,
        m[3]
      ))(obj_txt, rgx.smid_inline_link_endnote_url_helper_punctuated);
      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s %s%s%s%s%s%s %s",
        mkup.lnk_o, m["content"].strip, mkup.lnk_c,
        mkup.url_o, m["link"], mkup.url_c,
        mkup.en_a_o,
        mkup.lnk_o, m["link"].strip, mkup.lnk_c,
        mkup.url_o, m["link"], mkup.url_c,
        mkup.en_a_c
      ))(obj_txt, rgx.smid_inline_link_endnote_url_helper);
  } else {
      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s",
        m["pre"],
        mkup.lnk_o, m["content"].strip, mkup.lnk_c,
        mkup.url_o, m["link"], mkup.url_c
      ))(obj_txt, rgx.smid_inline_link_markup_regular);
    }
      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s",
        m["pre"],
        mkup.lnk_o, m["link"].strip, mkup.lnk_c,
        mkup.url_o, m["link"], mkup.url_c
      ))(obj_txt, rgx.smid_inline_link_naked_url); //
  }
  return obj_txt;
}
/+ book index variables +/
string book_idx_tmp;
string[][string][string] bookindex_unordered_hashes;
/+ node +/
ObjGenericComposite comp_obj_heading, comp_obj_location, comp_obj_block, comp_obj_code, comp_obj_poem_ocn, comp_obj_comment;
auto node_construct = NodeStructureMetadata();
enum sObj { content, anchor_tag, notes_reg, notes_star, links, image_no_dimensions }
#+END_SRC

*** inline para tag associations

#+name: abs_inline_para_tag_associations
#+BEGIN_SRC d
string[string][string] inline_para_link_anchor()(
  string[string]          an_object,
  string[string]          tag_in_seg,
  string[string][string]  tag_assoc
) {
  static auto rgx = Rgx();
  if (auto m = an_object["substantive"].match(rgx.inline_link_anchor)) {
    if (m.captures[1] !in tag_assoc) {
      tag_assoc[(m.captures[1])]["seg_lv4"] = tag_in_seg["seg_lv4"];
      tag_assoc[(m.captures[1])]["seg_lv1_to_4"] = tag_in_seg["seg_lv1_to_4"];
    } else {
      writeln("a tag named  already exists, check text line\n    ", an_object["substantive"]);
    }
  }
  return tag_assoc;
}
#+END_SRC

*** scope

#+name: abs_init_rest
#+BEGIN_SRC d
scope(success) {
}
scope(failure) {
}
scope(exit) {
  destroy(the_document_head_section);
  destroy(the_table_of_contents_section);
  destroy(the_document_body_section);
  destroy(the_bibliography_section);
  destroy(an_object);
  destroy(processing);
  destroy(biblio_arr_json);
  previous_length=0;
  reset_note_numbers=true;
}
#+END_SRC

*** init rest

#+name: abs_init_rest
#+BEGIN_SRC d
mixin DocReformRgxInitFlags;
mixin DocReformNode;
auto node_para_int_    = node_metadata_para_int;
auto node_para_str_    = node_metadata_para_str;
ObjGenericComposite comp_obj_heading_, comp_obj_para, comp_obj_toc;
line_occur = [
  "heading"  : 0,
  "para"     : 0,
  "glossary" : 0,
  "blurb"    : 0,
];
uint[string] dochas = [
  "inline_links"      : 0,
  "inline_notes"      : 0,
  "inline_notes_star" : 0,
  "codeblock"         : 0,
  "table"             : 0,
  "block"             : 0,
  "group"             : 0,
  "poem"              : 0,
  "quote"             : 0,
  "images"            : 0,
];
auto obj_type_status = flags_type_init;
string[string] object_number_poem = [
  "start" : "",
  "end"   : ""
];
string[] lv_ancestors_txt = [ "", "", "", "", "", "", "", "", ];
int[string] lv = [
  "lv" : State.off,
  "h0" : State.off,
  "h1" : State.off,
  "h2" : State.off,
  "h3" : State.off,
  "h4" : State.off,
  "h5" : State.off,
  "h6" : State.off,
  "h7" : State.off,
  "lev_int_collapsed" : 0,
];
int[string] collapsed_lev = [
  "h0" : State.off,
  "h1" : State.off,
  "h2" : State.off,
  "h3" : State.off,
  "h4" : State.off,
  "h5" : State.off,
  "h6" : State.off,
  "h7" : State.off
];
string[string] heading_match_str = [
  "h_A": "^(none)",
  "h_B": "^(none)",
  "h_C": "^(none)",
  "h_D": "^(none)",
  "h_1": "^(none)",
  "h_2": "^(none)",
  "h_3": "^(none)",
  "h_4": "^(none)"
];
Regex!char[string] heading_match_rgx = [
  "h_A": regex(r"^(none)"),
  "h_B": regex(r"^(none)"),
  "h_C": regex(r"^(none)"),
  "h_D": regex(r"^(none)"),
  "h_1": regex(r"^(none)"),
  "h_2": regex(r"^(none)"),
  "h_3": regex(r"^(none)"),
  "h_4": regex(r"^(none)")
];
string _anchor_tag;
string toc_txt_;
an_object["glossary_nugget"]                                   = "";
an_object["blurb_nugget"]                                      = "";
comp_obj_heading_                                              = comp_obj_heading_.init;
comp_obj_heading_.metainfo.is_of_part                          = "frontmatter";
comp_obj_heading_.metainfo.is_of_section                       = "toc";
comp_obj_heading_.metainfo.is_of_type                          = "para";
comp_obj_heading_.metainfo.is_a                                = "heading";
comp_obj_heading_.text                                         = "Table of Contents";
comp_obj_heading_.metainfo.ocn                                 = 0;
comp_obj_heading_.metainfo.identifier                          = "";
comp_obj_heading_.metainfo.dummy_heading                       = false;
comp_obj_heading_.metainfo.object_number_off                   = true;
comp_obj_heading_.metainfo.object_number_type                  = 0;
comp_obj_heading_.tags.segment_anchor_tag_epub                 = "toc";
comp_obj_heading_.tags.anchor_tag_html                         = comp_obj_heading_.tags.segment_anchor_tag_epub;
comp_obj_heading_.tags.in_segment_html                         = comp_obj_heading_.tags.anchor_tag_html;
comp_obj_heading_.metainfo.heading_lev_markup                  = 4;
comp_obj_heading_.metainfo.heading_lev_collapsed               = 1;
comp_obj_heading_.metainfo.parent_ocn                          = 1;
comp_obj_heading_.metainfo.parent_lev_markup                   = 0;
comp_obj_heading_.ptr.html_segnames                            = html_segnames_ptr;
comp_obj_heading_.tags.anchor_tags                             = ["toc"];
comp_obj_heading_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 1, 0, 0, 0];
comp_obj_heading_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 1, 0, 0, 0, 0, 0];
tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
auto toc_head                                                  = comp_obj_heading_;
html_segnames_ptr_cntr++;
the_table_of_contents_section = [toc_head];
static auto mkup = InlineMarkup();
static auto munge = ObjInlineMarkupMunge();
auto note_section = NotesSection();
auto bookindex_extract_hash = BookIndexNuggetHash();
string[][string] lev4_subtoc;
string[][string] segnames = ["html": ["toc"], "epub": ["toc"]];
int cnt1 = 1; int cnt2 = 1; int cnt3 = 1;
#+END_SRC

*** make tests

#+name: make_tests
#+BEGIN_SRC d
enum Substitute { match, markup, }
debug (substitutions) {
  writeln(__LINE__, ":", __FILE__, ": DEBUG substitutions:");
  if (!(conf_make_meta.make.headings.empty)) {
    writeln(conf_make_meta.make.headings);
  }
  if (conf_make_meta.make.substitute) {
    foreach(substitution_pair; conf_make_meta.make.substitute) {
       writeln("regex to match:       ", substitution_pair[Substitute.match]);
       writeln("substitution to make: ", substitution_pair[Substitute.markup]);
    }
  }
  if (conf_make_meta.make.bold) {
    writeln("regex to match:       ", conf_make_meta.make.bold[Substitute.match]);
    writeln("substitution to make: ", conf_make_meta.make.bold[Substitute.markup]);
  }
  if (conf_make_meta.make.emphasis) {
    writeln("regex to match:       ", conf_make_meta.make.emphasis[Substitute.match]);
    writeln("substitution to make: ", conf_make_meta.make.emphasis[Substitute.markup]);
  }
  if (conf_make_meta.make.italics) {
    writeln("regex to match:       ", conf_make_meta.make.italics[Substitute.match]);
    writeln("substitution to make: ", conf_make_meta.make.italics[Substitute.markup]);
  }
}
#+END_SRC

** 2. ↻ *LOOP* _loop: process document body_ [+6]                         :loop:
*** Loop scope                                                      :scope:

#+name: abs_in_loop_body_00
#+BEGIN_SRC d
/+ scope +/
scope(exit) {
}
scope(failure) {
  stderr.writefln(
    "%s\n%s\n%s:%s failed here:\n  line: %s",
    __MODULE__, __FUNCTION__,
    __FILE__, __LINE__,
    line,
  );
}
debug(source) {
  writeln(line);
}
debug(srclines) {
  if (!line.empty) {
    writefln(
      "* %s",
      line
    );
  }
}
#+END_SRC

*** check whether object_number is on or turned off                   :ocn:

#+name: abs_in_loop_body_00
#+BEGIN_SRC d
if (!line.empty) {
  obj_type_status = line._check_ocn_status_(obj_type_status);
}
#+END_SRC

*** separate _code blocks_ from _other markup text_ [+5] [#A]
**** _code blocks_                                            :block:code:

#+name: abs_in_loop_body_00_code_block
#+BEGIN_SRC d
/+ block object: code +/
line.flow_txt_block_code(an_object, obj_type_status);
continue;
#+END_SRC

**** _non code objects_ (non-code blocks & regular text: by line) [+4] :non_code:
***** inline fontface markup

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
line = line.inline_markup_faces; // by text line (rather than by text object), linebreaks in para problematic
#+END_SRC

***** in section (biblio, glossary, blurb) +(block group)+ [+1] :block:active:
****** in section: biblio                                       :biblio:

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
if ((line.matchFirst(rgx.heading_biblio)
  && obj_type_status["para"]  != State.on
  && obj_type_status["group"] != State.on
  && obj_type_status["block"] != State.on
  && obj_type_status["poem"]  != State.on
  && obj_type_status["table"] != State.on
  && obj_type_status["quote"] != State.on)
|| (obj_type_status["biblio_section"] == State.on
&& (!(line.matchFirst(rgx.heading_blurb_glossary)))
&& (!(line.matchFirst(rgx.heading)))
&& (!(line.matchFirst(rgx.comment))))) {
  /+ within section (block object): biblio +/
  obj_type_status["glossary_section"] = State.off;
  obj_type_status["biblio_section"]   = State.on;
  obj_type_status["blurb_section"]    = State.off;
  if (opt_action.backmatter && opt_action.section_biblio) {
    line.flow_txt_block_biblio(obj_type_status, bib_entry, biblio_entry_str_json, biblio_arr_json);
    debug(bibliobuild) {
      writeln("-  ", biblio_entry_str_json);
      writeln("-> ", biblio_arr_json.length);
    }
  }
  continue;
#+END_SRC

****** in section: glossary                                   :glossary:

if there is a glossary section you need to:
- extract it
- create standard headings
- markup contents in standard way like regular paragraphs
  - need indentation and regular paragraph inline markup
- reconstitute the document with the glossary section following the endnotes

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
} else if ((line.matchFirst(rgx.heading_glossary)
  && obj_type_status["para"]  != State.on
  && obj_type_status["group"] != State.on
  && obj_type_status["block"] != State.on
  && obj_type_status["poem"]  != State.on
  && obj_type_status["table"] != State.on
  && obj_type_status["quote"] != State.on)
|| (obj_type_status["glossary_section"] == State.on
&& (!(line.matchFirst(rgx.heading_biblio_blurb)))
&& (!(line.matchFirst(rgx.heading)))
&& (!(line.matchFirst(rgx.comment))))) {
  /+ within section (block object): glossary +/
  debug(glossary) {
    writeln(__LINE__);
    writeln(line);
  }
  obj_type_status["glossary_section"] = State.on;
  obj_type_status["biblio_section"]   = State.off;
  obj_type_status["blurb_section"]    = State.off;
  if (opt_action.backmatter && opt_action.section_glossary) {
    indent=[
      "hang_position" : 0,
      "base_position" : 0,
    ];
    bullet = false;
    obj_type_status["para"] = State.on;
    line_occur["para"] = State.off;
    an_object_key="glossary_nugget"; //
    if (line.matchFirst(rgx.heading_glossary)) {
      {
        comp_obj_heading_                                = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part            = "backmatter";
        comp_obj_heading_.metainfo.is_of_section         = "glossary";
        comp_obj_heading_.metainfo.is_of_type            = "para";
        comp_obj_heading_.metainfo.is_a                  = "heading";
        comp_obj_heading_.text                           = "Glossary";
        comp_obj_heading_.metainfo.ocn                   = 0;
        comp_obj_heading_.metainfo.identifier            = "";
        comp_obj_heading_.metainfo.dummy_heading         = false;
        comp_obj_heading_.metainfo.object_number_off     = true;
        comp_obj_heading_.metainfo.object_number_type    = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub   = "_part_glossary";
        comp_obj_heading_.tags.anchor_tag_html           = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html           = "glossary";
        comp_obj_heading_.tags.anchor_tags               = ["section_glossary"];
        comp_obj_heading_.metainfo.heading_lev_markup    = 1;
        comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
        comp_obj_heading_.metainfo.parent_ocn            = 1;
        comp_obj_heading_.metainfo.parent_lev_markup     = 0;
        comp_obj_heading_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 0, 0, 0, 0];
        comp_obj_heading_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 0, 0, 0, 0, 0, 0];
        the_glossary_section                             ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
      }
      {
        comp_obj_heading_                                = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part            = "backmatter";
        comp_obj_heading_.metainfo.is_of_section         = "glossary";
        comp_obj_heading_.metainfo.is_of_type            = "para";
        comp_obj_heading_.metainfo.is_a                  = "heading";
        comp_obj_heading_.text                           = "Glossary";
        comp_obj_heading_.metainfo.ocn                   = 0;
        comp_obj_heading_.metainfo.identifier            = "";
        comp_obj_heading_.metainfo.dummy_heading         = true;
        comp_obj_heading_.metainfo.object_number_off     = true;
        comp_obj_heading_.metainfo.object_number_type    = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub   = "glossary";
        comp_obj_heading_.tags.anchor_tag_html           = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html           = comp_obj_heading_.tags.anchor_tag_html;
        comp_obj_heading_.metainfo.heading_lev_markup    = 4;
        comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
        comp_obj_heading_.metainfo.parent_ocn            = 1;
        comp_obj_heading_.metainfo.parent_lev_markup     = 0;
        comp_obj_heading_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 1, 0, 0, 0];
        comp_obj_heading_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 1, 0, 0, 0, 0, 0];
        comp_obj_heading_.tags.anchor_tags               = ["glossary"];
        the_glossary_section                             ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
      }
    } else {
      an_object = line.flow_para_match_(an_object, an_object_key, indent, bullet, obj_type_status, line_occur);
      comp_obj_para                               = comp_obj_para.init;
      comp_obj_para.metainfo.is_of_part           = "backmatter";
      comp_obj_para.metainfo.is_of_section        = "glossary";
      comp_obj_para.metainfo.is_of_type           = "para";
      comp_obj_para.metainfo.is_a                 = "glossary";
      comp_obj_para.text                          = line.to!string.strip;
      comp_obj_para.metainfo.ocn                  = 0;
      comp_obj_para.metainfo.identifier           = "";
      comp_obj_para.metainfo.object_number_off    = true;
      comp_obj_para.metainfo.object_number_type   = 0;
      comp_obj_para.attrib.indent_hang            = indent["hang_position"];
      comp_obj_para.attrib.indent_base            = indent["base_position"];
      comp_obj_para.attrib.bullet                 = bullet;
      the_glossary_section                        ~= comp_obj_para;
    }
    obj_type_status["ocn_status"] = OCNstatus.on;
  }
  continue;
#+END_SRC

****** in section: blurb                                         :blurb:

if there is a blurb section you need to:
- extract it
- create standard headings (or use line provided in 1~ heading)
- markup contents in standard way like regular paragraphs
  - need regular paragraph inline markup
- reconstitute the document with the blurb section at the very end of the doucment

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
} else if ((line.matchFirst(rgx.heading_blurb)
  && obj_type_status["para"]  != State.on
  && obj_type_status["group"] != State.on
  && obj_type_status["block"] != State.on
  && obj_type_status["poem"]  != State.on
  && obj_type_status["table"] != State.on
  && obj_type_status["quote"] != State.on)
|| (obj_type_status["blurb_section"] == State.on
&& (!(line.matchFirst(rgx.heading_biblio_glossary)))
&& (!(line.matchFirst(rgx.heading)))
&& (!(line.matchFirst(rgx.comment))))) {
  /+ within section (block object): blurb +/
  debug(blurb) {
    writeln(__LINE__);
    writeln(line);
  }
  obj_type_status["glossary_section"] = State.off;
  obj_type_status["biblio_section"]   = State.off;
  obj_type_status["blurb_section"]    = State.on;
  if (opt_action.backmatter && opt_action.section_blurb) {
    indent=[
      "hang_position" : 0,
      "base_position" : 0,
    ];
    bullet = false;
    if (auto m = line.matchFirst(rgx.para_indent)) {
      debug(paraindent) {
        writeln(line);
      }
      indent["hang_position"] = (m["indent"]).to!int;
      indent["base_position"] = (m["indent"]).to!int;
    } else if (line.matchFirst(rgx.para_bullet)) {
      debug(parabullet) {
        writeln(line);
      }
      bullet = true;
    } else if (auto m = line.matchFirst(rgx.para_indent_hang)) {
      debug(paraindenthang) {
        writeln(line);
      }
      indent=[
        "hang_position" : (m["hang"]).to!int,
        "base_position" : (m["indent"]).to!int,
      ];
    } else if (auto m = line.matchFirst(rgx.para_bullet_indent)) {
      debug(parabulletindent) {
        writeln(line);
      }
      indent=[
        "hang_position" : (m["indent"]).to!int,
        "base_position" : (m["indent"]).to!int,
      ];
      bullet = true;
    }
    obj_type_status["para"] = State.on;
    line_occur["para"] = State.off;
    an_object_key="blurb_nugget";
    if (line.matchFirst(rgx.heading_blurb)) {
      {
        comp_obj_heading_                                              = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part                          = "backmatter";
        comp_obj_heading_.metainfo.is_of_section                       = "blurb";
        comp_obj_heading_.metainfo.is_of_type                          = "para";
        comp_obj_heading_.metainfo.is_a                                = "heading";
        comp_obj_heading_.text                                         = "Blurb";
        comp_obj_heading_.metainfo.ocn                                 = 0;
        comp_obj_heading_.metainfo.identifier                          = "";
        comp_obj_heading_.metainfo.dummy_heading                       = false;
        comp_obj_heading_.metainfo.object_number_off                   = true;
        comp_obj_heading_.metainfo.object_number_type                  = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub                 = "_part_blurb";
        comp_obj_heading_.tags.anchor_tag_html                         = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html                         = "blurb";
        comp_obj_heading_.tags.anchor_tags                             = ["section_blurb"];
        comp_obj_heading_.metainfo.heading_lev_markup                  = 1;
        comp_obj_heading_.metainfo.heading_lev_collapsed               = 1;
        comp_obj_heading_.metainfo.parent_ocn                          = 1;
        comp_obj_heading_.metainfo.parent_lev_markup                   = 0;
        comp_obj_heading_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 0, 0, 0, 0];
        comp_obj_heading_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 0, 0, 0, 0, 0, 0];
        the_blurb_section                                              ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
      }
      {
        comp_obj_heading_                                              = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part                          = "backmatter";
        comp_obj_heading_.metainfo.is_of_section                       = "blurb";
        comp_obj_heading_.metainfo.is_of_type                          = "para";
        comp_obj_heading_.metainfo.is_a                                = "heading";
        comp_obj_heading_.text                                         = "Blurb";
        comp_obj_heading_.metainfo.ocn                                 = 0;
        comp_obj_heading_.metainfo.identifier                          = "";
        comp_obj_heading_.metainfo.dummy_heading                       = true;
        comp_obj_heading_.metainfo.object_number_off                   = true;
        comp_obj_heading_.metainfo.object_number_type                  = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub                 = "blurb";
        comp_obj_heading_.tags.anchor_tag_html                         = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html                         = comp_obj_heading_.tags.anchor_tag_html;
        comp_obj_heading_.metainfo.heading_lev_markup                  = 4;
        comp_obj_heading_.metainfo.heading_lev_collapsed               = 2;
        comp_obj_heading_.metainfo.parent_ocn                          = 1;
        comp_obj_heading_.metainfo.parent_lev_markup                   = 0;
        comp_obj_heading_.tags.anchor_tags                             = ["blurb"];
        comp_obj_heading_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 1, 0, 0, 0];
        comp_obj_heading_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 1, 0, 0, 0, 0, 0];
        the_blurb_section                                              ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
      }
    } else if (line.matchFirst(rgx.heading)
    && (opt_action.backmatter && opt_action.section_blurb)) {
      comp_obj_heading_                                              = comp_obj_heading_.init;
      comp_obj_heading_.metainfo.is_of_part                          = "backmatter";
      comp_obj_heading_.metainfo.is_of_section                       = "blurb";
      comp_obj_heading_.metainfo.is_of_type                          = "para";
      comp_obj_heading_.metainfo.is_a                                = "heading";
      comp_obj_heading_.text                                         = line.to!string;
      comp_obj_heading_.metainfo.ocn                                 = 0;
      comp_obj_heading_.metainfo.identifier                          = "";
      comp_obj_heading_.metainfo.dummy_heading                       = false;
      comp_obj_heading_.metainfo.object_number_off                   = true;
      comp_obj_heading_.metainfo.object_number_type                  = 0;
      comp_obj_heading_.tags.segment_anchor_tag_epub                 = "blurb";
      comp_obj_heading_.tags.anchor_tag_html                         = comp_obj_heading_.tags.segment_anchor_tag_epub;
      comp_obj_heading_.tags.in_segment_html                         = comp_obj_heading_.tags.anchor_tag_html;
      comp_obj_heading_.metainfo.heading_lev_markup                  = an_object["lev_markup_number"].to!int;    // make int, remove need to conv
      comp_obj_heading_.metainfo.heading_lev_collapsed               = an_object["lev_collapsed_number"].to!int; // make int, remove need to conv
      comp_obj_heading_.metainfo.parent_ocn                          = 1;
      comp_obj_heading_.metainfo.parent_lev_markup                   = 0;
      the_blurb_section                                              ~= comp_obj_heading_;
      tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
      tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
    } else {
      an_object = line.flow_para_match_(an_object, an_object_key, indent, bullet, obj_type_status, line_occur);
      comp_obj_para                               = comp_obj_para.init;
      comp_obj_para.metainfo.is_of_part           = "backmatter";
      comp_obj_para.metainfo.is_of_section        = "blurb";
      comp_obj_para.metainfo.is_of_type           = "para";
      comp_obj_para.metainfo.is_a                 = "blurb";
      comp_obj_para.text                          = links_and_images(line.to!string.strip).replaceFirst(rgx.para_attribs, "");
      comp_obj_para.metainfo.ocn                  = 0;
      comp_obj_para.metainfo.identifier           = "";
      comp_obj_para.metainfo.object_number_off    = true;
      comp_obj_para.metainfo.object_number_type   = 0;
      comp_obj_para.attrib.indent_hang            = indent["hang_position"];
      comp_obj_para.attrib.indent_base            = indent["base_position"];
      comp_obj_para.has.inline_links              = true;
      comp_obj_para.attrib.bullet                 = bullet;
      the_blurb_section                           ~= comp_obj_para;
    }
    obj_type_status["ocn_status"] = OCNstatus.on;
  }
  continue;
#+END_SRC

***** in blocks [+1]                                       :block:active:
****** in block: quote                                           :quote:

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
} else if (obj_type_status["quote"] == TriState.on) {                          /+ within block object: quote +/
  line = line
    ._doc_header_and_make_substitutions_(conf_make_meta)
    ._doc_header_and_make_substitutions_fontface_(conf_make_meta);
  an_object = line.flow_txt_block_quote(an_object, obj_type_status);
  continue;
#+END_SRC

****** in block: group                                           :group:

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
/+ within block object: group +/
} else if (obj_type_status["group"] == TriState.on) {                          /+ within block object: group +/
  line = line
    ._doc_header_and_make_substitutions_(conf_make_meta)
    ._doc_header_and_make_substitutions_fontface_(conf_make_meta)
    .replaceAll(rgx.para_delimiter, mkup.br_paragraph ~ "$1");
  an_object = line.flow_txt_block_group(an_object, obj_type_status);
  continue;
#+END_SRC

****** in block: block                                           :block:

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
} else if (obj_type_status["block"] == TriState.on) {                          /+ within block object: block +/
  line = line
    ._doc_header_and_make_substitutions_(conf_make_meta)
    ._doc_header_and_make_substitutions_fontface_(conf_make_meta);
  if (auto m = line.match(rgx.spaces_keep)) {
    line = line
      .replaceAll(rgx.spaces_keep, (m.captures[1]).translate([ ' ' : mkup.nbsp ]));
  }
  an_object = line.flow_txt_block_block(an_object, obj_type_status);
  continue;
#+END_SRC

****** in block: poem                                             :poem:

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
} else if (obj_type_status["poem"] == TriState.on) {                           /+ within block object: poem +/
  an_object = line.flow_txt_block_poem(an_object, obj_type_status, cntr, object_number_poem, conf_make_meta, tag_in_seg);
  continue;
#+END_SRC

****** in block: table                                           :table:

#+name: abs_in_loop_body_non_code_obj
#+BEGIN_SRC d
} else if (obj_type_status["table"] == TriState.on) {                          /+ within block object: table +/
  an_object = line.flow_txt_block_table(an_object, obj_type_status, conf_make_meta);
  continue;
#+END_SRC

***** not identified as being within block group (could still be, or not) [+3]
****** assert

#+name: abs_in_loop_body_open_block_obj_assert
#+BEGIN_SRC d
assert(
  (obj_type_status["blocks"] == TriState.off)
  || (obj_type_status["blocks"] == TriState.closing),
  "block status: none or closed"
);
assertions_flag_types_block_status_none_or_closed(obj_type_status);
#+END_SRC

****** catch misc +block open+

#+name: abs_in_loop_body_open_block_obj
#+BEGIN_SRC d
if (line.matchFirst(rgx.block_poem_open)) {                                    /+ poem to verse exceptions! +/
  object_reset(an_object);
  processing.remove("verse");
  object_number_poem["start"] = obj_cite_digits.object_number.to!string;
}
line.flow_txt_block_start(obj_type_status, dochas, object_number_poem);
continue;
#+END_SRC

****** line not empty [+2]
******* asserts                                                :assert:

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
assert(
  !line.empty,
  "line tested, line not empty surely:\n  \"" ~ line ~ "\""
);
assert(
  (obj_type_status["blocks"] == TriState.off)
  || (obj_type_status["blocks"] == TriState.closing),
  "code block status: none or closed"
);
if (obj_type_status["blocks"] == TriState.closing) {
  debug(check) {
    writeln(__LINE__);
    writeln(line);
  }
  assert(
    line.matchFirst(rgx.book_index)
    || line.matchFirst(rgx.book_index_open)
    || obj_type_status["book_index"] == State.on,
    "\nblocks closed, unless followed by book index, non-matching line:\n  \""
    ~ line ~ "\""
  );
}
#+END_SRC

******* book index                                          :bookindex:

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
if (line.matchFirst(rgx.book_index)
|| line.matchFirst(rgx.book_index_open)
|| obj_type_status["book_index"] == State.on )  {                              /+ book_index +/
  an_object = line.flow_book_index_(an_object, book_idx_tmp, obj_type_status, opt_action);
#+END_SRC

******* not book index [+1]

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
} else {                                                                       /+ not book_index +/
#+END_SRC

******** matched: comment                              :comment:match:

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
  an_object_key="body_nugget";
  if (auto m = line.matchFirst(rgx.comment)) {                                 /+ matched comment +/
    debug(comment) {
      writeln(line);
    }
    an_object[an_object_key]                ~= line ~= "\n";
    comp_obj_comment                        = comp_obj_comment.init;
    comp_obj_comment.metainfo.is_of_part    = "comment"; // breaks flow
    comp_obj_comment.metainfo.is_of_section = "comment"; // breaks flow
    comp_obj_comment.metainfo.is_of_type    = "comment";
    comp_obj_comment.metainfo.is_a          = "comment";
    comp_obj_comment.text                   = an_object[an_object_key].strip;
    the_document_body_section               ~= comp_obj_comment;
    flow_common_reset_(line_occur, an_object, obj_type_status);
    processing.remove("verse");
    ++cntr;
#+END_SRC

******** flag !set & line !exist: heading or para  :heading:paragraph:

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
  } else if (((line_occur["para"] == State.off)
  && (line_occur["heading"] == State.off))
  && ((obj_type_status["para"] == State.off)
  && (obj_type_status["heading"] == State.off))) {                             /+ heading or para but neither flag nor line exists +/
    if ((conf_make_meta.make.headings.length > 2)
    && (obj_type_status["make_headings"] == State.off)) {                      /+ heading found +/
      heading_match_str = line.flow_heading_found_(heading_match_str, conf_make_meta.make.headings, heading_match_rgx, obj_type_status);
    }
    if ((obj_type_status["make_headings"] == State.on)
    && ((line_occur["para"] == State.off)
    && (line_occur["heading"] == State.off))
    && ((obj_type_status["para"] == State.off)
    && (obj_type_status["heading"] == State.off))) {                           /+ heading make set +/
      line = line.flow_heading_make_set_(line_occur, heading_match_rgx, obj_type_status);
    }
    /+ TODO node info: all headings identified at this point,
       - extract node info here??
       - how long can it wait?
       - should be incorporated in composite objects
       - should happen before endnote links set (they need to be moved down?)
    +/
    if (line.matchFirst(rgx.heading)) {                                        /+ heading match +/
      line = line._doc_header_and_make_substitutions_(conf_make_meta);
      an_object = line.flow_heading_matched_(an_object, line_occur, an_object_key, lv, collapsed_lev, obj_type_status, conf_make_meta);
    } else if (line_occur["para"] == State.off) {                              /+ para match +/
      an_object_key="body_nugget";
      line = line
        ._doc_header_and_make_substitutions_(conf_make_meta)
        ._doc_header_and_make_substitutions_fontface_(conf_make_meta);
      an_object = line.flow_para_match_(an_object, an_object_key, indent, bullet, obj_type_status, line_occur);
    }
#+END_SRC

******** line exist: heading                                 :heading:

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
  } else if (line_occur["heading"] > State.off) {                              /+ heading +/
    debug(heading) {
      writeln(line);
    }
    an_object[an_object_key] ~= line ~= "\n";
    ++line_occur["heading"];
#+END_SRC

******** line exist: para                                       :para:

#+name: abs_in_loop_body_not_block_obj
#+BEGIN_SRC d
  } else if (line_occur["para"] > State.off) {                                 /+ paragraph +/
    debug(para) {
      writeln(an_object_key, "-> ", line);
    }
    line = line
      ._doc_header_and_make_substitutions_(conf_make_meta)
      ._doc_header_and_make_substitutions_fontface_(conf_make_meta);
    an_object[an_object_key] ~= " " ~ line;
    ++line_occur["para"];
  }
}
#+END_SRC

****** line empty, with block flag

#+name: abs_in_loop_body_not_block_obj_line_empty_blocks_flags
#+BEGIN_SRC d
an_object = line.flow_block_flag_line_empty_(
  an_object,
  bookindex_extract_hash,
  the_document_body_section,
  bookindex_unordered_hashes,
  obj_cite_digits,
  comp_obj_heading,
  cntr,
  obj_type_status,
  object_number_poem,
  conf_make_meta,
  tag_in_seg,
);
#+END_SRC

****** line empty [+1]
******* assert line empty                                      :assert:

#+name: abs_in_loop_body_not_block_obj_line_empty
#+BEGIN_SRC d
assert(
  line.empty,
  "\nline should be empty:\n  \""
  ~ line ~ "\""
);
assert(
  (obj_type_status["blocks"] == State.off),
  "code block status: none"
);
#+END_SRC

******* heading object                                 :heading:object:

#+name: abs_in_loop_body_not_block_obj_line_empty
#+BEGIN_SRC d
if (_new_doc) {
  tag_assoc = tag_assoc.init;
  lv0_to_3_tags = lv0_to_3_tags.init;
  tag_in_seg = tag_in_seg.init;
}
if ((obj_type_status["heading"] == State.on)
&& (line_occur["heading"] > State.off)) {                                      /+ heading object (current line empty) +/
  obj_cite_digits = (an_object["lev_markup_number"].to!int == 0)
  ? ocn_emit(OCNstatus.reset)
  : ocn_emit(obj_type_status["ocn_status"]);
  an_object["is"] = "heading";
  an_object_key="body_nugget";
  auto substantive_object_and_anchor_tags_tuple
    = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, ((_new_doc) ? Yes._new_doc : No._new_doc));
  an_object["substantive"] = substantive_object_and_anchor_tags_tuple[sObj.content];
  anchor_tag = substantive_object_and_anchor_tags_tuple[sObj.anchor_tag];
  if (_new_doc) {
    cnt1 = 1;
    cnt2 = 1;
    cnt3 = 1;
    _new_doc = false;
  }
  if (
    an_object["lev_markup_number"].to!int == 4
    && (!(anchor_tag.empty)
    || (lv0_to_3_tags.length > 0))
  ) {
    tag_in_seg["seg_lv4"] = anchor_tag;
    tag_in_seg["seg_lv1_to_4"] = anchor_tag;
    lev_anchor_tag = anchor_tag;
    tag_assoc[anchor_tag]["seg_lv4"] = tag_in_seg["seg_lv4"];
    tag_assoc[anchor_tag]["seg_lv1_to_4"] = tag_in_seg["seg_lv1_to_4"];
    if (lv0_to_3_tags.length > 0) { /+ names used for html markup segments 1 to 4 (rather than epub which has separate segments for A to D) +/
      foreach (lv0_to_lv3_html_tag; lv0_to_3_tags) {
        tag_assoc[lv0_to_lv3_html_tag]["seg_lv4"] = anchor_tag;
      }
    }
    anchor_tag_ = anchor_tag;
    lv0_to_3_tags = lv0_to_3_tags.init;
  } else if (an_object["lev_markup_number"].to!int > 4) {
    tag_in_seg["seg_lv4"] = anchor_tag_;
    tag_in_seg["seg_lv1_to_4"] = anchor_tag_;
    lev_anchor_tag = anchor_tag;
    tag_assoc[anchor_tag]["seg_lv4"] = tag_in_seg["seg_lv4"];
    tag_assoc[anchor_tag]["seg_lv1_to_4"] = tag_in_seg["seg_lv1_to_4"];
  } else if (an_object["lev_markup_number"].to!int < 4) {
    string segn;
    switch (an_object["lev_markup_number"].to!int) {                           /+ names used for epub markup segments A to D +/
    case 0:
      segn = "_the_title";
      goto default;
    case 1:
      segn = "_part_" ~ cnt1.to!string;
      ++cnt1;
      goto default;
    case 2:
      segn = "_part_" ~ cnt1.to!string ~ "_" ~ cnt2.to!string;
      ++cnt2;
      goto default;
    case 3:
      segn =  "_part_" ~ cnt1.to!string ~ "_" ~ cnt2.to!string ~ "_" ~ cnt3.to!string;
      ++cnt3;
      goto default;
    default:
      lv0_to_3_tags ~= obj_cite_digits.object_number.to!string;
      lv0_to_3_tags ~= segn;
      tag_in_seg["seg_lv4"] = segn; // for html segname need following lv4 not yet known
      tag_in_seg["seg_lv1_to_4"] = segn;
      break;
    }
  }
  an_object["bookindex_nugget"]
    = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
  bookindex_unordered_hashes
    = bookindex_extract_hash.bookindex_nugget_hash(an_object["bookindex_nugget"], obj_cite_digits, tag_in_seg);
  /+ (incrementally build toc) table of contents here! +/
  _anchor_tag                   = obj_cite_digits.identifier;
  the_table_of_contents_section = obj_im.flow_table_of_contents_gather_headings(
    an_object,
    conf_make_meta,
    tag_in_seg,
    _anchor_tag,
    lev4_subtoc,
    the_table_of_contents_section,
  );
  if (an_object["lev_markup_number"] == "4") {
    segnames["html"] ~= tag_in_seg["seg_lv4"];
    html_segnames_ptr = html_segnames_ptr_cntr;
    html_segnames_ptr_cntr++;
  }
  if (an_object["lev_markup_number"].to!int <= 4) {
    segnames["epub"] ~= tag_in_seg["seg_lv1_to_4"];
  }
  auto comp_obj_heading
    = node_construct.node_emitter_heading(
      an_object["substantive"],
      an_object["lev_markup_number"],
      an_object["lev_collapsed_number"],
      an_object["dummy_heading_status"],
      tag_in_seg,
      lev_anchor_tag,
      tag_assoc,
      obj_cite_digits,                              // OCNset
      cntr,                                         // int
      heading_ptr,                                  // int
      lv_ancestors_txt,                             // string[]
      an_object["is"],                              // string
      html_segnames_ptr,                            // int
      substantive_object_and_anchor_tags_tuple[sObj.notes_reg],
      substantive_object_and_anchor_tags_tuple[sObj.notes_star],
      substantive_object_and_anchor_tags_tuple[sObj.links],
    );
  ++heading_ptr;
  debug(segments) {
    writeln(an_object["lev_markup_number"]);
    writeln(tag_in_seg["seg_lv4"]);
    writeln(tag_in_seg["seg_lv1_to_4"]);
  }
  the_document_body_section ~= comp_obj_heading;
  debug(objectrelated1) { // check
    writeln(line);
  }
  flow_common_reset_(line_occur, an_object, obj_type_status);
  an_object.remove("lev");
  an_object.remove("lev_markup_number");
  processing.remove("verse");
  ++cntr;
#+END_SRC

******* paragraph object                             :paragraph:object:

#+name: abs_in_loop_body_not_block_obj_line_empty
#+BEGIN_SRC d
} else if ((obj_type_status["para"] == State.on)
&& (line_occur["para"] > State.off)) {
  /+ paragraph object (current line empty) +/
  /+ repeated character paragraph separator +/
  if ((an_object[an_object_key].to!string).matchFirst(rgx.repeated_character_line_separator)) {
    obj_type_status["ocn_status"]                          = OCNstatus.off;
  }
  obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
  an_object["bookindex_nugget"]
    = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
  bookindex_unordered_hashes
    = bookindex_extract_hash.bookindex_nugget_hash(an_object["bookindex_nugget"], obj_cite_digits, tag_in_seg);
  an_object["is"] = "para";
  auto comp_obj_heading
    = node_construct.node_location_emitter(
      content_non_header,
      tag_in_seg,
      lev_anchor_tag,
      tag_assoc,
      obj_cite_digits,
      cntr,
      heading_ptr-1,
      an_object["is"],
    );
  auto substantive_obj_misc_tuple
    = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
  an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
  anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
  comp_obj_para                                             = comp_obj_para.init;
  comp_obj_para.metainfo.is_of_part                         = "body";
  comp_obj_para.metainfo.is_of_section                      = "body";
  comp_obj_para.metainfo.is_of_type                         = "para";
  comp_obj_para.metainfo.is_a                               = "para";
  comp_obj_para.text                                        = an_object["substantive"].to!string.strip;
  comp_obj_para.tags.html_segment_anchor_tag_is             = tag_in_seg["seg_lv4"];
  comp_obj_para.tags.epub_segment_anchor_tag_is             = tag_in_seg["seg_lv1_to_4"];
  comp_obj_para.metainfo.ocn                                = obj_cite_digits.object_number;
  comp_obj_para.metainfo.identifier                         = obj_cite_digits.identifier;
  comp_obj_para.metainfo.object_number_off                  = (obj_cite_digits.off==0)   ? true : false; // TODO
  comp_obj_para.metainfo.o_n_book_index                     = obj_cite_digits.bkidx;
  comp_obj_para.metainfo.object_number_type                 = obj_cite_digits.type;
  comp_obj_para.attrib.indent_hang                          = indent["hang_position"];
  comp_obj_para.attrib.indent_base                          = indent["base_position"];
  comp_obj_para.attrib.bullet                               = bullet;
  comp_obj_para.tags.anchor_tags                            = [anchor_tag];
  comp_obj_para.has.inline_notes_reg                        = substantive_obj_misc_tuple[sObj.notes_reg];
  comp_obj_para.has.inline_notes_star                       = substantive_obj_misc_tuple[sObj.notes_star];
  comp_obj_para.has.inline_links                            = substantive_obj_misc_tuple[sObj.links];
  comp_obj_para.has.image_without_dimensions                = substantive_obj_misc_tuple[sObj.image_no_dimensions];
  the_document_body_section                                 ~= comp_obj_para;
  tag_assoc                                                 = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
  flow_common_reset_(line_occur, an_object, obj_type_status);
  indent=[
    "hang_position" : 0,
    "base_position" : 0,
  ];
  bullet = false;
  processing.remove("verse");
  ++cntr;
} else {
  // could be useful to test line variable should be empty and never null
}
#+END_SRC

*** regular _text objects_ identified                        :text:paragraph:

#+name: abs_in_loop_body_01
#+BEGIN_SRC d
/+ unless (the_document_body_section.length == 0) ? +/
if (the_document_body_section.length > 0) {
  if (((the_document_body_section[$-1].metainfo.is_a == "para")
    || (the_document_body_section[$-1].metainfo.is_a == "heading")
    || (the_document_body_section[$-1].metainfo.is_a == "quote")
    || (the_document_body_section[$-1].metainfo.is_a == "group")
    || (the_document_body_section[$-1].metainfo.is_a == "block")
    || (the_document_body_section[$-1].metainfo.is_a == "verse"))
  && (the_document_body_section.length > previous_length)) {
    if ((the_document_body_section[$-1].metainfo.is_a == "heading")
    && (the_document_body_section[$-1].metainfo.heading_lev_markup < 5)) {
      obj_type_status["glossary_section"] = State.off;
      obj_type_status["biblio_section"]   = State.off;
      obj_type_status["blurb_section"]    = State.off;
    }
    if (the_document_body_section[$-1].metainfo.is_a == "verse") {             /+ scan for endnotes for whole poem (each verse in poem) +/
      foreach (i; previous_length .. the_document_body_section.length) {
        if (the_document_body_section[i].metainfo.is_a == "verse") {
          if ((the_document_body_section[i].text).match(
            rgx.inline_notes_al_all_note
          )) {
            note_section.gather_notes_for_endnote_section(
              the_document_body_section,
              tag_in_seg,
              (i).to!int,
            );
          }
        }
      }
    } else {                                                                   /+ scan object for endnotes +/
      previous_length = the_document_body_section.length.to!int;
      if ((the_document_body_section[$-1].text).match(
        rgx.inline_notes_al_all_note
      )) {
        previous_count=(the_document_body_section.length -1).to!int;
        note_section.gather_notes_for_endnote_section(
          the_document_body_section,
          tag_in_seg,
          (the_document_body_section.length-1).to!int,
        );
      }
    }
    previous_length = the_document_body_section.length.to!int;
  }
}
#+END_SRC

** 3. _post main-loop processing_                                       :post:
*** misc

/+
  Backmatter:
  - endnotes
  - glossary
  - bibliography / references
  - book index
  - blurb
+/

*** tie up preparation of document sections
**** endnotes section (scroll & seg)                            :endnotes:

#+name: abs_post
#+BEGIN_SRC d
auto en_tuple
  = note_section.endnote_objects(obj_cite_digits, opt_action);
static assert(!isTypeTuple!(en_tuple));
auto the_endnotes_section = en_tuple[0];
obj_cite_digits = en_tuple[1];
debug(endnotes) {
  writefln(
    "%s %s",
    __LINE__,
    the_endnotes_section.length
  );
  foreach (o; the_endnotes_section) {
    writeln(o);
  }
}
#+END_SRC

**** no glossary section?                                       :glossary:

#+name: abs_post
#+BEGIN_SRC d
if (an_object["glossary_nugget"].length == 0) {
  comp_obj_heading_                                 = comp_obj_heading_.init;
  comp_obj_heading_.metainfo.is_of_part             = "empty";
  comp_obj_heading_.metainfo.is_of_section          = "empty";
  comp_obj_heading_.metainfo.is_of_type             = "para";
  comp_obj_heading_.metainfo.is_a                   = "heading";
  comp_obj_heading_.text                            = "(skip) there is no Glossary section";
  comp_obj_heading_.metainfo.ocn                    = 0;
  comp_obj_heading_.metainfo.identifier             = "";
  comp_obj_heading_.metainfo.dummy_heading          = true;
  comp_obj_heading_.metainfo.object_number_off      = true;
  comp_obj_heading_.metainfo.object_number_type     = 0;
  comp_obj_heading_.metainfo.heading_lev_markup     = 1;
  comp_obj_heading_.metainfo.heading_lev_collapsed  = 1;
  comp_obj_heading_.metainfo.parent_ocn             = 1;
  comp_obj_heading_.metainfo.parent_lev_markup      = 0;
  the_glossary_section                              ~= comp_obj_heading_;
}
debug(glossary) {
  foreach (gloss; the_glossary_section) {
    writeln(gloss.text);
  }
}
#+END_SRC

**** bibliography section (objects)                         :bibliography:

#+name: abs_post
#+BEGIN_SRC d
auto biblio_unsorted_incomplete = biblio_arr_json.dup;
auto biblio = Bibliography();
auto biblio_ordered
  = biblio.flow_bibliography_(biblio_unsorted_incomplete, bib_arr_json);
#+END_SRC

#+name: abs_post
#+BEGIN_SRC d
if (biblio_ordered.length > 0) {
  {
    comp_obj_heading_                                 = comp_obj_heading_.init;
    comp_obj_heading_.metainfo.is_of_part             = "backmatter";
    comp_obj_heading_.metainfo.is_of_section          = "bibliography";
    comp_obj_heading_.metainfo.is_of_type             = "para";
    comp_obj_heading_.metainfo.is_a                   = "heading";
    comp_obj_heading_.text                            = "Bibliography";
    comp_obj_heading_.metainfo.ocn                    = 0;
    comp_obj_heading_.metainfo.identifier             = "";
    comp_obj_heading_.metainfo.dummy_heading          = true;
    comp_obj_heading_.metainfo.object_number_off      = true;
    comp_obj_heading_.metainfo.object_number_type     = 0;
    comp_obj_heading_.tags.segment_anchor_tag_epub    = "_part_bibliography";
    comp_obj_heading_.tags.anchor_tag_html            = comp_obj_heading_.tags.segment_anchor_tag_epub;
    comp_obj_heading_.tags.in_segment_html            = "bibliography";
    comp_obj_heading_.tags.anchor_tags                = ["section_bibliography"];
    comp_obj_heading_.metainfo.heading_lev_markup     = 1;
    comp_obj_heading_.metainfo.heading_lev_collapsed  = 1;
    comp_obj_heading_.metainfo.parent_ocn             = 1;
    comp_obj_heading_.metainfo.parent_lev_markup      = 0;
    the_bibliography_section                          ~= comp_obj_heading_;
    tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
    tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
  }
  {
    comp_obj_heading_                                 = comp_obj_heading_.init;
    comp_obj_heading_.metainfo.is_of_part             = "backmatter";
    comp_obj_heading_.metainfo.is_of_section          = "bibliography";
    comp_obj_heading_.metainfo.is_of_type             = "para";
    comp_obj_heading_.metainfo.is_a                   = "heading";
    comp_obj_heading_.text                            = "Bibliography";
    comp_obj_heading_.metainfo.ocn                    = 0;
    comp_obj_heading_.metainfo.identifier             = "";
    comp_obj_heading_.metainfo.dummy_heading          = true;
    comp_obj_heading_.metainfo.object_number_off      = true;
    comp_obj_heading_.metainfo.object_number_type     = 0;
    comp_obj_heading_.tags.segment_anchor_tag_epub    = "bibliography";
    comp_obj_heading_.tags.anchor_tag_html            = comp_obj_heading_.tags.segment_anchor_tag_epub;
    comp_obj_heading_.tags.in_segment_html            = comp_obj_heading_.tags.anchor_tag_html;
    comp_obj_heading_.metainfo.heading_lev_markup     = 4;
    comp_obj_heading_.metainfo.heading_lev_collapsed  = 2;
    comp_obj_heading_.metainfo.parent_ocn             = 1;
    comp_obj_heading_.metainfo.parent_lev_markup      = 0;
    comp_obj_heading_.tags.anchor_tags                = ["bibliography"];
    the_bibliography_section                          ~= comp_obj_heading_;
    tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
    tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
  }
} else {
  comp_obj_heading_                                 = comp_obj_heading_.init;
  comp_obj_heading_.metainfo.is_of_part             = "empty";
  comp_obj_heading_.metainfo.is_of_section          = "empty";
  comp_obj_heading_.metainfo.is_of_type             = "para";
  comp_obj_heading_.metainfo.is_a                   = "heading";
  comp_obj_heading_.text                            = "(skip) there is no Bibliography";
  comp_obj_heading_.metainfo.ocn                    = 0;
  comp_obj_heading_.metainfo.identifier             = "";
  comp_obj_heading_.metainfo.dummy_heading          = true;
  comp_obj_heading_.metainfo.object_number_off      = true;
  comp_obj_heading_.metainfo.object_number_type     = 0;
  comp_obj_heading_.metainfo.heading_lev_markup     = 1;
  comp_obj_heading_.metainfo.heading_lev_collapsed  = 1;
  comp_obj_heading_.metainfo.parent_ocn             = 1;
  comp_obj_heading_.metainfo.parent_lev_markup      = 0;
  the_bibliography_section                          ~= comp_obj_heading_;
}
#+END_SRC

***** format biblio string

#+name: abs_post
#+BEGIN_SRC d
string out_;
foreach (entry; biblio_ordered) {
  out_ = format(
    "%s \"%s\"%s%s%s%s%s%s%s%s%s.",
    ((entry["author"].str.empty) ? entry["editor"].str : entry["author"].str),
    entry["fulltitle"].str,
    ((entry["journal"].str.empty) ? "" : ", " ~ mkup.italic ~ mkup.ff_o ~ entry["journal"].str ~ mkup.ff_c ~ mkup.italic),
    ((entry["volume"].str.empty) ? "" : ", " ~ entry["volume"].str),
    ((entry["in"].str.empty) ? "" : ", " ~ entry["in"].str),
    ((!(entry["author"].str.empty) && (!(entry["editor"].str.empty))) ? entry["editor"].str : ""),
    ", " ~ entry["year"].str,
    ((entry["pages"].str.empty) ? "" : ", " ~ entry["pages"].str),
    ((entry["publisher"].str.empty) ? "" : ", " ~ entry["publisher"].str),
    ((entry["place"].str.empty) ? "" : ", " ~ entry["place"].str),
    ((entry["url"].str.empty) ? "" : ", [" ~ entry["url"].str ~ "]"),
  );
  comp_obj_para                               = comp_obj_para.init;
  comp_obj_para.metainfo.is_of_part           = "backmatter";
  comp_obj_para.metainfo.is_of_section        = "bibliography";
  comp_obj_para.metainfo.is_of_type           = "para";
  comp_obj_para.metainfo.is_a                 = "bibliography";
  comp_obj_para.text                          = out_.to!string.strip;
  comp_obj_para.metainfo.ocn                  = 0;
  comp_obj_para.metainfo.identifier           = "";
  comp_obj_para.metainfo.object_number_off    = true;
  comp_obj_para.metainfo.object_number_type   = 0;
  comp_obj_para.attrib.indent_hang            = 0;
  comp_obj_para.attrib.indent_base            = 1;
  comp_obj_para.attrib.bullet                 = bullet;
  comp_obj_para.tags.anchor_tags              = [anchor_tag];
  the_bibliography_section                    ~= comp_obj_para;
}
#+END_SRC

#+name: abs_post
#+BEGIN_SRC d
debug(bibliosection) {
  foreach (o; the_bibliography_section) {
    writeln(o.text);
  }
}
#+END_SRC

***** bibliography components

JSONValue biblio_entry_tags_jsonstr =  `{
  "is"                               : "",
  "sortby_deemed_author_year_title"  : "",
  "deemed_author"                    : "",
  "author_raw"                       : "",
  "author"                           : "",
  "author_arr"                       : [ "" ],
  "editor_raw"                       : "",
  "editor"                           : "",
  "editor_arr"                       : [ "" ],
  "title"                            : "",
  "subtitle"                         : "",
  "fulltitle"                        : "",
  "language"                         : "",
  "trans"                            : "",
  "src"                              : "",
  "journal"                          : "",
  "in"                               : "",
  "volume"                           : "",
  "edition"                          : "",
  "year"                             : "",
  "place"                            : "",
  "publisher"                        : "",
  "url"                              : "",
  "pages"                            : "",
  "note"                             : "",
  "short_name"                       : "",
  "id"                               : ""
}`; // is: book, article, magazine, newspaper, blog, other

**** bookindex section (scroll & seg)                         :book:index:

#+name: abs_post
#+BEGIN_SRC d
auto bi = BookIndexReportSection();
auto bi_tuple
  = bi.bookindex_build_abstraction_section(
    bookindex_unordered_hashes,
    obj_cite_digits,
    opt_action,
  );
destroy(bookindex_unordered_hashes);
static assert(!isTypeTuple!(bi_tuple));
auto the_bookindex_section = bi_tuple[0];
obj_cite_digits = bi_tuple[1];
debug(bookindex) {
  foreach (bi_entry; the_bookindex_section) {
    writeln(bi_entry);
  }
}
#+END_SRC

**** no blurb section?                                             :blurb:

#+name: abs_post
#+BEGIN_SRC d
if (an_object["blurb_nugget"].length == 0) {
  comp_obj_heading_                                = comp_obj_heading_.init;
  comp_obj_heading_.metainfo.is_of_part            = "empty";
  comp_obj_heading_.metainfo.is_of_section         = "empty";
  comp_obj_heading_.metainfo.is_of_type            = "para";
  comp_obj_heading_.metainfo.is_a                  = "heading";
  comp_obj_heading_.text                           = "(skip) there is no Blurb section";
  comp_obj_heading_.metainfo.ocn                   = 0;
  comp_obj_heading_.metainfo.identifier            = "";
  comp_obj_para.metainfo.object_number_off         = true;
  comp_obj_para.metainfo.object_number_type        = 0;
  comp_obj_heading_.tags.segment_anchor_tag_epub   = "";
  comp_obj_heading_.tags.anchor_tag_html           = "";
  comp_obj_heading_.tags.in_segment_html           = "";
  comp_obj_heading_.metainfo.heading_lev_markup    = 1;
  comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
  comp_obj_heading_.metainfo.parent_ocn            = 1;
  comp_obj_heading_.metainfo.parent_lev_markup     = 0;
  the_blurb_section                                ~= comp_obj_heading_;
}
debug(blurb) {
  foreach (blurb; the_blurb_section) {
    writeln(blurb.text);
  }
}
#+END_SRC

**** toc backmatter, table of contents backmatter (scroll & seg) :contents:

#+name: abs_post
#+BEGIN_SRC d
indent=[
  "hang_position" : 1,
  "base_position" : 1,
];
comp_obj_toc                               = comp_obj_toc.init;
comp_obj_toc.metainfo.is_of_part           = "frontmatter";
comp_obj_toc.metainfo.is_of_section        = "toc";
comp_obj_toc.metainfo.is_of_type           = "para";
comp_obj_toc.metainfo.is_a                 = "toc";
comp_obj_toc.metainfo.ocn                  = 0;
comp_obj_toc.metainfo.identifier           = "";
comp_obj_toc.metainfo.object_number_off    = true;
comp_obj_toc.metainfo.object_number_type   = 0;
comp_obj_toc.attrib.indent_hang            = indent["hang_position"];
comp_obj_toc.attrib.indent_base            = indent["base_position"];
comp_obj_toc.attrib.bullet                 = false;
if (the_endnotes_section.length > 1) {
  toc_txt_ = format(
    mkup.lnk_o ~ "%s" ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
    "Endnotes",
    "endnotes",
  );
  toc_txt_= toc_txt_.links_and_images;
  comp_obj_toc.text                       = toc_txt_.to!string.strip;
  comp_obj_toc.has.inline_links           = true;
  the_table_of_contents_section           ~= comp_obj_toc;
}
if (the_glossary_section.length > 1) {
  toc_txt_ = format(
    mkup.lnk_o ~ "%s" ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
    "Glossary",
    "glossary",
  );
  toc_txt_= toc_txt_.links_and_images;
  comp_obj_toc.text                       = toc_txt_.to!string.strip;
  comp_obj_toc.has.inline_links           = true;
  the_table_of_contents_section           ~= comp_obj_toc;
}
if (the_bibliography_section.length > 1){
  toc_txt_ = format(
    mkup.lnk_o ~ "%s" ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
    "Bibliography",
    "bibliography",
  );
  toc_txt_= toc_txt_.links_and_images;
  comp_obj_toc.text                       = toc_txt_.to!string.strip;
  comp_obj_toc.has.inline_links           = true;
  the_table_of_contents_section           ~= comp_obj_toc;
}
if (the_bookindex_section.length > 1) {
  toc_txt_ = format(
    mkup.lnk_o ~ "%s" ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
    "Book Index",
    "bookindex",
  );
  toc_txt_= toc_txt_.links_and_images;
  comp_obj_toc.text                       = toc_txt_.to!string.strip;
  comp_obj_toc.has.inline_links           = true;
  the_table_of_contents_section           ~= comp_obj_toc;
}
if (the_blurb_section.length > 1) {
  toc_txt_ = format(
    mkup.lnk_o ~ "%s" ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
    "Blurb",
    "blurb",
  );
  toc_txt_= toc_txt_.links_and_images;
  comp_obj_toc.has.inline_links           = true;
  comp_obj_toc.text                       = toc_txt_.to!string.strip;
  the_table_of_contents_section           ~= comp_obj_toc;
}
debug(toc) {
  writefln(
    "%s %s",
    __LINE__,
  );
  foreach (toc_linked_heading; the_table_of_contents_section) {
    writeln(mkup.indent_by_spaces_provided(toc_linked_heading.attrib.indent_hang), toc_linked_heading.text);
  }
}
#+END_SRC

**** doc head (separate document head from body, make space for toc)

#+name: abs_post
#+BEGIN_SRC d
the_document_head_section ~= the_document_body_section[0];
the_document_body_section=the_document_body_section[1..$];
#+END_SRC

*** ↻ *LOOPs* _post main-loop loops_                                :loop:post:
**** 1. ↻ _Loop as required_ (e.g. backmatter): loop up to lev4, extract html_segnames, set pointers

this extra loop is used/needed to determine pre and (in particular) next segment
for html, that is then used in a subsequent loop

NOTE there are issues attempting to do this on first pass as:
  - backmatter is created out of sequence and
  - it is not certain which are present

  - it is quite neat to have all in one place as we have here

  - could optimise a bit by
    - skipping this loop unless the html seg or epub output is selected

***** Methods
****** get ancestors markup

#+name: abs_post
#+BEGIN_SRC d
int[] _get_ancestors_markup(O)(O obj, ref int[] _ancestors_markup) {
  if (obj.metainfo.is_a == "heading") {
    debug(dom) {
      writeln(obj.text);
    }
    if (obj.metainfo.heading_lev_markup == 1) {
      _ancestors_markup = [
        _ancestors_markup[0],
        0,0,0,0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 2) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        0,0,0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 3) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        _ancestors_markup[2],
        0,0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 4) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        _ancestors_markup[2],
        _ancestors_markup[3],
        0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 5) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        _ancestors_markup[2],
        _ancestors_markup[3],
        _ancestors_markup[4],
        0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 6) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        _ancestors_markup[2],
        _ancestors_markup[3],
        _ancestors_markup[4],
        _ancestors_markup[5],
        0,0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 7) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        _ancestors_markup[2],
        _ancestors_markup[3],
        _ancestors_markup[4],
        _ancestors_markup[5],
        _ancestors_markup[6],
        0
      ];
    }
    if (obj.metainfo.heading_lev_markup == 8) {
      _ancestors_markup = [
        _ancestors_markup[0],
        _ancestors_markup[1],
        _ancestors_markup[2],
        _ancestors_markup[3],
        _ancestors_markup[4],
        _ancestors_markup[5],
        _ancestors_markup[6],
        _ancestors_markup[7]
      ];
    }
    _ancestors_markup[obj.metainfo.heading_lev_markup] = obj.metainfo.ocn;
  }
  debug(ancestor_markup) {
    writeln("marked up: ", _ancestors_markup);
  }
  return _ancestors_markup;
}
#+END_SRC

****** get ancestors collapsed

#+name: abs_post
#+BEGIN_SRC d
int[] _get_ancestors_collapsed(O)(O obj, ref int[] _ancestors_collapsed) {
  if (obj.metainfo.is_a == "heading") {
    if (obj.metainfo.heading_lev_collapsed == 1) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        0,0,0,0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 2) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        0,0,0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 3) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        _ancestors_collapsed[2],
        0,0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 4) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        _ancestors_collapsed[2],
        _ancestors_collapsed[3],
        0,0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 5) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        _ancestors_collapsed[2],
        _ancestors_collapsed[3],
        _ancestors_collapsed[4],
        0,0,0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 6) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        _ancestors_collapsed[2],
        _ancestors_collapsed[3],
        _ancestors_collapsed[4],
        _ancestors_collapsed[5],
        0,0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 7) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        _ancestors_collapsed[2],
        _ancestors_collapsed[3],
        _ancestors_collapsed[4],
        _ancestors_collapsed[5],
        _ancestors_collapsed[6],
        0
      ];
    }
    if (obj.metainfo.heading_lev_collapsed == 8) {
      _ancestors_collapsed = [
        _ancestors_collapsed[0],
        _ancestors_collapsed[1],
        _ancestors_collapsed[2],
        _ancestors_collapsed[3],
        _ancestors_collapsed[4],
        _ancestors_collapsed[5],
        _ancestors_collapsed[6],
        _ancestors_collapsed[7]
      ];
    }
    _ancestors_collapsed[obj.metainfo.heading_lev_collapsed] = obj.metainfo.ocn;
  }
  debug(ancestor_collapsed) {
    writeln("collapsed: ", _ancestors_collapsed);
  }
  return _ancestors_collapsed;
}
#+END_SRC

***** ↻ Loop section: document body [bd]

- substantive object numbers already exist
- number un-numbered non-substantive text

#+name: abs_post
#+BEGIN_SRC d
/+ multiple 1~ levels, loop through document body +/
if (the_document_body_section.length > 1) {
  int[] _ancestors_markup = [0,0,0,0,0,0,0,0];
  int[][] _ancestors_markup_;
  _ancestors_markup = [1,0,0,0,0,0,0,0];
  _ancestors_markup_ ~= _ancestors_markup;
  int[] _ancestors_collapsed = [0,0,0,0,0,0,0,0];
  int[][] _ancestors_collapsed_;
  _ancestors_collapsed = [1,0,0,0,0,0,0,0];
  _ancestors_collapsed_ ~= _ancestors_collapsed;
  foreach (ref obj; the_document_body_section) {
    if (obj.metainfo.is_a == "heading") {
      obj.metainfo.markedup_ancestors = _get_ancestors_markup(obj, _ancestors_markup);
      obj.metainfo.collapsed_ancestors = _get_ancestors_collapsed(obj, _ancestors_collapsed);
      obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
    }
  }
  debug(ancestors) {
    writeln("ancestors markup o_n:    ", obj.metainfo.markedup_ancestors);
    writeln("ancestors collapsed o_n: ", obj.metainfo.markedup_ancestors);
  }
}
#+END_SRC

***** ↻ Loop section: endnotes [en]

#+name: abs_post
#+BEGIN_SRC d
if (the_endnotes_section.length > 1) {
  segnames["html"] ~= "endnotes";
  segnames["epub"] ~= "endnotes";
  html_segnames_ptr = html_segnames_ptr_cntr;
  foreach (ref obj; the_endnotes_section) {
    if (obj.metainfo.is_a == "heading") {
      obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
    }
    if (obj.metainfo.heading_lev_markup == 4) {
      obj.ptr.html_segnames = html_segnames_ptr;
      break;
    }
  }
  html_segnames_ptr_cntr++;
}
#+END_SRC

***** ↻ Loop section: glossary [gl]

#+name: abs_post
#+BEGIN_SRC d
if (the_glossary_section.length > 1) {
  segnames["html"] ~= "glossary";
  segnames["epub"] ~= "glossary";
  html_segnames_ptr = html_segnames_ptr_cntr;
  foreach (ref obj; the_glossary_section) {
    if (obj.metainfo.is_a == "heading") {
      obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
    }
    if (obj.metainfo.heading_lev_markup == 4) {
      obj.ptr.html_segnames = html_segnames_ptr;
      break;
    }
  }
  html_segnames_ptr_cntr++;
}
#+END_SRC

***** ↻ Loop section: bibliography [bb]

#+name: abs_post
#+BEGIN_SRC d
if (the_bibliography_section.length > 1) {
  segnames["html"] ~= "bibliography";
  segnames["epub"] ~= "bibliography";
  html_segnames_ptr = html_segnames_ptr_cntr;
  foreach (ref obj; the_bibliography_section) {
    if (obj.metainfo.is_a == "heading") {
      obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
    }
    if (obj.metainfo.heading_lev_markup == 4) {
      obj.ptr.html_segnames = html_segnames_ptr;
      break;
    }
  }
  html_segnames_ptr_cntr++;
}
#+END_SRC

***** ↻ Loop section: book index [bi]

#+name: abs_post
#+BEGIN_SRC d
if (the_bookindex_section.length > 1) {
  segnames["html"] ~= "bookindex";
  segnames["epub"] ~= "bookindex";
  html_segnames_ptr = html_segnames_ptr_cntr;
  foreach (ref obj; the_bookindex_section) {
    if (obj.metainfo.is_a == "heading") {
      obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
    }
    if (obj.metainfo.heading_lev_markup == 4) {
      obj.ptr.html_segnames = html_segnames_ptr;
      break;
    }
  }
  html_segnames_ptr_cntr++;
}
#+END_SRC

***** ↻ Loop section: blurb [bl]

#+name: abs_post
#+BEGIN_SRC d
if (the_blurb_section.length > 1) {
  segnames["html"] ~= "blurb";
  segnames["epub"] ~= "blurb";
  html_segnames_ptr = html_segnames_ptr_cntr;
  foreach (ref obj; the_blurb_section) {
    if (obj.metainfo.is_a == "heading") {
      obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
    }
    if (obj.metainfo.heading_lev_markup == 4) {
      obj.ptr.html_segnames = html_segnames_ptr;
      break;
    }
  }
  html_segnames_ptr_cntr++;
}
#+END_SRC

**** 2. ↻ _Loop all objects:_ encode _structural relationships_ (sections, segments, objects)

needed for DOM structure, segnames & subtoc, backmatter pointers & unique image
list

if used minimally only for DOM structure, segnames, subtoc, could optimise by
- skipping second and third pass unless the output html seg or epub is being
  made!

- this loop could conveniently be used more extensively for ancestors as well
  (though this information can be extracted earlier)

Build here:
- DOM structure
  - ancestors & decendants
    - ancestors could be determined earlier, but convenient to have here
    - descendants could be in the form of:
      - headings contained under current heading, and/or;
      - the range of objects under the current heading
- numbering
  - already given
    - substantive object numbers
    - endnote
  - provide
    - glossary
    - bibliography
    - book index
    - blurb
    - other non-substantive objects (prefix & other stuff)
  - you could also decide on a sequential object list, containing all objects
    (both substantive and non-substantive objects), in addition to ocn, which
    are for substantive/ citable objects within the document

(as needed) up to document heading 1~, lev4 html:

- during this (the third) pass all previous and next segment names are known
- next are not yet known for backmatter during the second pas

***** Methods
****** decendants

#+name: abs_post
#+BEGIN_SRC d
auto get_decendants()(ObjGenericComposite[] document_sections) {
  int[string] _heading_ocn_decendants;
  string[] _ocn_open_key = ["","","","","","","",""];
  auto _doc_sect_length = document_sections.length - 1;
  int _last_ocn;
  foreach (_lg, ref obj; document_sections) {
    if (obj.metainfo.is_a == "heading") {
      foreach (_dts_lv, dom_tag_status; obj.metainfo.dom_structure_markedup_tags_status) {
        switch (dom_tag_status) with (DomTags) {
        case none: break;
        case open:
            _ocn_open_key[_dts_lv] = (obj.metainfo.ocn).to!string;
            _heading_ocn_decendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn;
          break;
        case close:
          if (_ocn_open_key[_dts_lv].empty) {
            _ocn_open_key[_dts_lv] = "0";
          }
          _heading_ocn_decendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn - 1;
          _ocn_open_key[_dts_lv] = (0).to!string;
          break;
        case close_and_open:
          if (_ocn_open_key[_dts_lv].empty) {
            _ocn_open_key[_dts_lv] = "0";
          }
          _heading_ocn_decendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn - 1;
          _ocn_open_key[_dts_lv] = (obj.metainfo.ocn).to!string;
          _heading_ocn_decendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn;
          break;
        case open_still: break;
        default: break;
        }
      }
    }
    if (obj.metainfo.ocn > 0) {
      _last_ocn = obj.metainfo.ocn;
    }
    if (_lg == _doc_sect_length) {
      _heading_ocn_decendants["1"] = _last_ocn; // close existing o_n key
    }
  }
  Tuple!(int, int)[] pairs;
  foreach (pair; _heading_ocn_decendants.byPair) {
    pairs ~= tuple(pair[0].to!int, pair[1]);
  }
  return pairs.sort;
}
#+END_SRC

****** images: extract

#+name: abs_post
#+BEGIN_SRC d
string[] _images;
string[] extract_images()(string content_block) {
  string[] images_;
  if (auto m = content_block.matchAll(rgx.image)) {
    images_ ~= m.captures[1];
  }
  return images_;
}
string[] segnames_0_to_4;
#+END_SRC

****** images: dimensions

#+name: abs_post
#+BEGIN_SRC d
auto _image_dimensions(O,M)(O obj, M manifested) {
  if (obj.has.image_without_dimensions) {
    import std.math;
    import imageformats;
    int w, h, chans;
    real _w, _h;
    int max_width = 640;
    foreach (m; obj.text.matchAll(rgx.inline_image_without_dimensions)) {
      debug(images) {
        writeln(manifested.src.image_dir_path ~ "/" ~ m["img"]);
      }
      read_image_info(manifested.src.image_dir_path ~ "/" ~ m["img"], w, h, chans);
      // calculate, decide max width and proportionally reduce to keep w & h within it
      debug(images) {
        writeln("width: ", w, ", height: ", h);
      }
      if (w > max_width) {
        _w = max_width;
        _h = round((max_width / w.to!real) * h.to!real);
      } else {
        _w = w;
        _h = h;
      }
      obj.text = obj.text.replaceFirst(
        rgx.inline_image_without_dimensions,
        format(q"┃%s☼%s,w%sh%s %s┃",
          "$1",
          "$3",
          _w.to!string,
          _h.to!string,
          "$6",
        )
      );
    }
    debug(images) {
      writeln("image without dimensions: ", obj.text);
    }
  }
  return obj;
}
#+END_SRC

***** links: think about!!!
- move actual links to an array in object struct so they cannot be regex munged within text block
  - you may wish to exclude certain types of internal document link
    - object number links
      - toc
      - book index
    - footnotes and footnote numbers

#+name: abs_post
#+BEGIN_SRC d
auto _links(O)(O obj) {
  if (auto m = obj.text.match(rgx.inline_link_stow_uri)) {
    debug(links) {
      writeln("number of link matches to stow: ", (obj.text.match(rgx.inline_link_stow_uri)).count);
      writeln("links to stow: ", (obj.text.match(rgx.inline_link_stow_uri)));
    }
    int _n_matches = (obj.text.match(rgx.inline_link_stow_uri)).count.to!int;
    for(int i=0; i < _n_matches; ++i) {
      if (obj.text.match(rgx.inline_link_stow_uri)) {
        obj.stow.link ~= obj.text.matchFirst(rgx.inline_link_stow_uri)[2];
        obj.text = obj.text.replaceFirst(
          rgx.inline_link_stow_uri,
          format(q"┃┥%s┝┤%s├┃", "$1", i)
        );
      }
    }
  }
  return obj;
}
#+END_SRC

***** ↻ Loop section: head

#+name: abs_post
#+BEGIN_SRC d
foreach (ref obj; the_document_head_section) {
  if (obj.metainfo.is_a == "heading") {
    debug(dom) {
      writeln(obj.text);
    }
    if (obj.metainfo.heading_lev_markup <= 4) {
      segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
    }
    if (obj.metainfo.heading_lev_markup == 0) {
      /+ TODO second hit (of two) with same assertion failure, check, fix and reinstate
      assert( obj.metainfo.ocn == 1,
        "Title OCN should be 1 not: " ~ obj.metainfo.ocn.to!string); // bug introduced 0.18.1
      +/
      obj.metainfo.ocn = 1;
      obj.metainfo.identifier = "1";
      obj.metainfo.object_number_type = OCNtype.ocn;
    }
    /+ dom structure (marked up & collapsed) +/
    if (opt_action.meta_processing_xml_dom) {
      obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
      obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
    }
    obj = obj.obj_heading_ancestors(lv_ancestors_txt);
  }
  obj = _links(obj);
}
#+END_SRC

***** ↻ Loop section: toc [to]

#+name: abs_post
#+BEGIN_SRC d
if (the_table_of_contents_section.length > 1) {
  /+ scroll +/
  dom_structure_markedup_tags_status_buffer = dom_structure_markedup_tags_status.dup;
  dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
  foreach (ref obj; the_table_of_contents_section) {
    if (obj.metainfo.is_a == "heading") {
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    }
    obj = _links(obj);
  }
}
#+END_SRC

***** ↻ Loop section: document body [bd]

#+name: abs_post
#+BEGIN_SRC d
/+ multiple 1~ levels, loop through document body +/
if (the_document_body_section.length > 1) {
  foreach (ref obj; the_document_body_section) {
    if (!(obj.metainfo.identifier.empty)) {
      if (!(((obj.metainfo.identifier) in tag_assoc)
        && ("seg_lv4" in tag_assoc[(obj.metainfo.identifier)]))
      ) {
        tag_assoc[(obj.metainfo.identifier)]["seg_lv4"]
        = obj.tags.html_segment_anchor_tag_is;
      }
      tag_assoc[(obj.metainfo.identifier)]["seg_lv1_to_4"]
      = obj.tags.epub_segment_anchor_tag_is;
    }
    if (obj.metainfo.is_a == "heading") {
      debug(dom) {
        writeln(obj.text);
      }
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.lev4_subtoc = lev4_subtoc[obj.tags.anchor_tag_html];
          obj.tags.segname_prev = segnames["html"][obj.ptr.html_segnames - 1];
          if (segnames["html"].length > obj.ptr.html_segnames + 1) {
            obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          }
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    } else if (obj.metainfo.is_a == "para") {
       _images ~= extract_images(obj.text);
       obj = _image_dimensions(obj, manifested);
    }
    obj = _links(obj);
  }
}
auto image_list = (_images.sort()).uniq;
#+END_SRC

***** ↻ Loop section: endnotes [en]

- endnotes have their own number, (also use in node) and they belong to calling object

#+name: abs_post
#+BEGIN_SRC d
/+ optional only one 1~ level +/
if (the_endnotes_section.length > 1) {
  dom_structure_markedup_tags_status_buffer  = dom_structure_markedup_tags_status.dup;
  dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
  dom_structure_markedup_tags_status         = dom_structure_markedup_tags_status_buffer.dup;
  dom_structure_collapsed_tags_status        = dom_structure_collapsed_tags_status_buffer.dup;
  foreach (ref obj; the_endnotes_section) {
    if (obj.metainfo.is_a == "heading") {
      debug(dom) {
        writeln(obj.text);
      }
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.segname_prev = segnames["html"][obj.ptr.html_segnames - 1];
          if (segnames["html"].length > obj.ptr.html_segnames + 1) {
            obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          }
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    }
    obj = _links(obj);
  }
}
#+END_SRC

***** ↻ Loop section: glossary [gl]

- add glossary numbering, (also use in node) no need to show in text

#+name: abs_post
#+BEGIN_SRC d
/+ optional only one 1~ level +/
if (the_glossary_section.length > 1) {
  foreach (ref obj; the_glossary_section) {
    if (obj.metainfo.is_a == "heading") {
      debug(dom) {
        writeln(obj.text);
      }
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.segname_prev = segnames["html"][obj.ptr.html_segnames - 1];
          if (segnames["html"].length > obj.ptr.html_segnames + 1) {
            obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          }
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    } else if (obj.metainfo.is_a == "glossary") {
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
    }
    obj = _links(obj);
  }
}
#+END_SRC

***** ↻ Loop section: bibliography [bb]

- add bibliography numbering, (also use in node) no need to show in text

#+name: abs_post
#+BEGIN_SRC d
/+ optional only one 1~ level +/
if (the_bibliography_section.length > 1) {
  foreach (ref obj; the_bibliography_section) {
    if (obj.metainfo.is_a == "heading") {
      debug(dom) {
        writeln(obj.text);
      }
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.segname_prev = segnames["html"][obj.ptr.html_segnames - 1];
          if (segnames["html"].length > obj.ptr.html_segnames + 1) {
            obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          }
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    } else if (obj.metainfo.is_a == "bibliography") {
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
    }
    obj = _links(obj);
  }
}
#+END_SRC

***** ↻ Loop section: book index (scroll, seg) [bi]

- add book index numbering?, (also use in node) no need to show in text

#+name: abs_post
#+BEGIN_SRC d
/+ optional only one 1~ level +/
int ocn_       = obj_cite_digits.object_number;
int ocn_bkidx_ = 0;
int ocn_bidx_;
if (the_bookindex_section.length > 1) {                                        /+ scroll +/
  dom_structure_markedup_tags_status_buffer = dom_structure_markedup_tags_status.dup;
  dom_structure_collapsed_tags_status_buffer = dom_structure_collapsed_tags_status.dup;
  foreach (ref obj; the_bookindex_section) {
    if (obj.metainfo.is_a == "heading") {
      debug(dom) {
      }
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
      }
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
      if (obj.metainfo.heading_lev_markup <= 4) {
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.segname_prev = segnames["html"][obj.ptr.html_segnames - 1];
          if (segnames["html"].length > obj.ptr.html_segnames + 1) {
            obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          }
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    } else if (obj.metainfo.is_a == "bookindex") {
      obj_cite_digits                       = ocn_emit(OCNstatus.bkidx);
      obj.metainfo.ocn                      = obj_cite_digits.object_number;
      obj.metainfo.identifier               = obj_cite_digits.identifier;
      obj.metainfo.o_n_book_index           = obj_cite_digits.bkidx;
      obj.metainfo.object_number_type       = OCNtype.bkidx;
    }
    obj = _links(obj);
  }
  /+ TODO assert failure, reinstate
  assert(obj_cite_digit_bkidx == ocn_bidx_
    obj_cite_digit_bkidx ~ " == ocn_" ~ ocn_ ~ "?");
  +/
}
#+END_SRC

***** ↻ Loop section: blurb [bl]

#+name: abs_post
#+BEGIN_SRC d
/+ optional only one 1~ level +/
if (the_blurb_section.length > 1) {
  foreach (ref obj; the_blurb_section) {
    if (obj.metainfo.is_a == "heading") {
      debug(dom) {
        writeln(obj.text);
      }
      obj_cite_digits         = ocn_emit(OCNstatus.on);
      obj.metainfo.ocn        = obj_cite_digits.object_number;
      obj.metainfo.identifier = obj_cite_digits.identifier;
      if (obj.metainfo.heading_lev_markup <= 4) {
        segnames_0_to_4 ~= obj.tags.segment_anchor_tag_epub;
        if (obj.metainfo.heading_lev_markup == 4) {
          obj.tags.segname_prev = segnames["html"][obj.ptr.html_segnames - 1];
          if (segnames["html"].length > obj.ptr.html_segnames + 1) {
            obj.tags.segname_next = segnames["html"][obj.ptr.html_segnames + 1];
          }
          assert(obj.tags.anchor_tag_html == segnames["html"][obj.ptr.html_segnames],
            obj.tags.anchor_tag_html ~ "!=" ~ segnames["html"][obj.ptr.html_segnames]);
        }
      }
      /+ dom structure (marked up & collapsed) +/
      if (opt_action.meta_processing_xml_dom) {
        obj = obj.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, obj.metainfo.heading_lev_markup);
        obj = obj.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, obj.metainfo.heading_lev_collapsed);
      }
      obj = obj.obj_heading_ancestors(lv_ancestors_txt);
    } else if (obj.metainfo.is_a == "blurb") {
      obj_cite_digits = ocn_emit(OCNstatus.off);
      obj.metainfo.object_number_off  = obj_cite_digits.off;
      obj.metainfo.object_number_type = OCNtype.non;
    }
    obj = _links(obj);
  }
}
#+END_SRC

***** ↻ Loop sections: get decendants

#+name: abs_post
#+BEGIN_SRC d
if (the_document_body_section.length > 1) {
  auto pairs = get_decendants(
    the_document_head_section ~
    the_document_body_section ~
    the_endnotes_section ~
    the_glossary_section ~
    the_bibliography_section ~
    the_bookindex_section ~
    the_blurb_section
  );
  debug(decendants_tuple) {
    pairs = pairs.sort();
    foreach (pair; pairs) {  // (pair; pairs.sort())
      writeln(pair[0], "..", pair[1]);
    }
  }
  foreach (ref obj; the_document_head_section) {
    if (obj.metainfo.is_a == "heading") {
      foreach (pair; pairs) {
        if (obj.metainfo.ocn == pair[0]) {
          obj.metainfo.last_decendant_ocn = pair[1];
        }
      }
    }
  }
  if (the_document_body_section.length > 1) {
    foreach (ref obj; the_document_body_section) {
      if (obj.metainfo.is_a == "heading") {
        foreach (pair; pairs) {
          if (obj.metainfo.ocn == pair[0]) {
            obj.metainfo.last_decendant_ocn = pair[1];
          }
        }
      }
    }
  }
  if (the_endnotes_section.length > 1) {
    foreach (ref obj; the_endnotes_section) {
      if (obj.metainfo.is_a == "heading") {
        foreach (pair; pairs) {
          if (obj.metainfo.ocn == pair[0]) {
            obj.metainfo.last_decendant_ocn = pair[1];
          }
        }
      }
    }
  }
  if (the_glossary_section.length > 1) {
    foreach (ref obj; the_glossary_section) {
      if (obj.metainfo.is_a == "heading") {
        foreach (pair; pairs) {
          if (obj.metainfo.ocn == pair[0]) {
            obj.metainfo.last_decendant_ocn = pair[1];
          }
        }
      }
    }
  }
  if (the_bibliography_section.length > 1) {
    foreach (ref obj; the_bibliography_section) {
      if (obj.metainfo.is_a == "heading") {
        foreach (pair; pairs) {
          if (obj.metainfo.ocn == pair[0]) {
            obj.metainfo.last_decendant_ocn = pair[1];
          }
        }
      }
    }
  }
  if (the_bookindex_section.length > 1) {
    foreach (ref obj; the_bookindex_section) {
      if (obj.metainfo.is_a == "heading") {
        foreach (pair; pairs) {
          if (obj.metainfo.ocn == pair[0]) {
            obj.metainfo.last_decendant_ocn = pair[1];
          }
        }
      }
    }
  }
  if (the_blurb_section.length > 1) {
    foreach (ref obj; the_blurb_section) {
      if (obj.metainfo.is_a == "heading") {
        foreach (pair; pairs) {
          if (obj.metainfo.ocn == pair[0]) {
            obj.metainfo.last_decendant_ocn = pair[1];
          }
        }
      }
    }
  }
}
#+END_SRC

**** TODO update BUG?

#+name: abs_post
#+BEGIN_SRC d
  /+ TODO
    - note create/insert heading object sole purpose eof close all open tags
      sort out:
      - obj.metainfo.dom_structure_markedup_tags_status = dom_structure_markedup_tags_status;
      - obj.metainfo.dom_structure_collapsed_tags_status = dom_structure_collapsed_tags_status;
  +/
comp_obj_heading_                                 = comp_obj_heading_.init;
comp_obj_heading_.metainfo.is_of_part             = "empty";
comp_obj_heading_.metainfo.is_of_section          = "empty";
comp_obj_heading_.metainfo.is_of_type             = "para";
comp_obj_heading_.metainfo.is_a                   = "heading";
comp_obj_heading_.metainfo.ocn                    = 0;
comp_obj_heading_.metainfo.identifier             = "";
comp_obj_heading_.metainfo.dummy_heading          = true;
comp_obj_heading_.metainfo.object_number_off      = true;
comp_obj_heading_.metainfo.object_number_type     = 0;
comp_obj_heading_.tags.segment_anchor_tag_epub    = "";
comp_obj_heading_.tags.anchor_tag_html            = "";
comp_obj_heading_.tags.in_segment_html            = "";
comp_obj_heading_.tags.html_segment_anchor_tag_is = "";
comp_obj_heading_.tags.epub_segment_anchor_tag_is = "";
comp_obj_heading_.metainfo.heading_lev_markup     = 9;
comp_obj_heading_.metainfo.heading_lev_collapsed  = 9;
comp_obj_heading_.metainfo.parent_ocn             = 0;
comp_obj_heading_.metainfo.parent_lev_markup      = 0;
comp_obj_heading_.metainfo.dom_structure_markedup_tags_status          = dom_structure_markedup_tags_status.dup;
comp_obj_heading_.metainfo.dom_structure_collapsed_tags_status         = dom_structure_collapsed_tags_status.dup;
comp_obj_heading_ = comp_obj_heading_.obj_dom_structure_set_markup_tags(dom_structure_markedup_tags_status, 0);
comp_obj_heading_ = comp_obj_heading_.obj_dom_set_collapsed_tags(dom_structure_collapsed_tags_status, 0);
comp_obj_heading_ = comp_obj_heading_.obj_heading_ancestors(lv_ancestors_txt);
// the_dom_tail_section                      ~= comp_obj_heading_; // remove tail for now, decide on later
#+END_SRC

** 4. _return document tuple_                                           :post:
*** _the document_                                                 :document:

#+name: abs_post
#+BEGIN_SRC d
ObjGenericComposite[][string] document_the = [
  "head":             the_document_head_section,
  "toc":              the_table_of_contents_section,
  /+ substantive/body: +/
  "body":             the_document_body_section,
  /+ backmatter: +/
  "endnotes":         the_endnotes_section,
  "glossary":         the_glossary_section,
  "bibliography":     the_bibliography_section,
  "bookindex":        the_bookindex_section,
  "blurb":            the_blurb_section,
  /+ dom tail only +/
  "tail":             the_dom_tail_section,
];
#+END_SRC

*** document _section keys_ sequence

#+name: abs_post
#+BEGIN_SRC d
string[][string] document_section_keys_sequenced = [
  "scroll": ["head", "toc", "body",],
  "seg":    ["head", "toc", "body",],
  "sql":    ["head", "body",],
  "latex":  ["head", "toc", "body",]
];
if (document_the["endnotes"].length > 1) {
  document_section_keys_sequenced["scroll"] ~= "endnotes";
  document_section_keys_sequenced["seg"]    ~= "endnotes";
  document_section_keys_sequenced["latex"]  ~= "endnotes";
}
if (document_the["glossary"].length > 1) {
  document_section_keys_sequenced["scroll"] ~= "glossary";
  document_section_keys_sequenced["seg"]    ~= "glossary";
  document_section_keys_sequenced["sql"]    ~= "glossary";
  document_section_keys_sequenced["latex"]  ~= "glossary";
}
if (document_the["bibliography"].length > 1) {
  document_section_keys_sequenced["scroll"] ~= "bibliography";
  document_section_keys_sequenced["seg"]    ~= "bibliography";
  document_section_keys_sequenced["sql"]    ~= "bibliography";
  document_section_keys_sequenced["latex"]  ~= "bibliography";
}
if (document_the["bookindex"].length > 1) {
  document_section_keys_sequenced["scroll"] ~= "bookindex";
  document_section_keys_sequenced["seg"]    ~= "bookindex";
  document_section_keys_sequenced["sql"]    ~= "bookindex";
  document_section_keys_sequenced["latex"]  ~= "bookindex";
}
if (document_the["blurb"].length > 1) {
  document_section_keys_sequenced["scroll"] ~= "blurb";
  document_section_keys_sequenced["seg"]    ~= "blurb";
  document_section_keys_sequenced["sql"]    ~= "blurb";
  document_section_keys_sequenced["latex"]  ~= "blurb";
}
if ((opt_action.html)
|| (opt_action.html_scroll)
|| (opt_action.html_seg)
|| (opt_action.epub)) {
  document_section_keys_sequenced["scroll"] ~= "tail";
  document_section_keys_sequenced["seg"]    ~= "tail";
}
#+END_SRC

*** dup

#+name: abs_post
#+BEGIN_SRC d
string[] segnames_4        = segnames["html"].dup;
string[] segnames_lv1_to_4 = segnames["epub"].dup;
debug(segnames) {
  writeln("segnames_lv4:      ", segnames_4);
  writeln("segnames_lv1_to_4: ", segnames_lv1_to_4);
}
#+END_SRC

*** clean out structure

#+name: abs_post
#+BEGIN_SRC d
destroy(the_document_head_section);
destroy(the_table_of_contents_section);
destroy(the_document_body_section);
destroy(the_endnotes_section);
destroy(the_glossary_section);
destroy(the_bibliography_section);
destroy(the_bookindex_section);
destroy(the_blurb_section);
destroy(segnames);
destroy(bookindex_unordered_hashes);
destroy(an_object);
obj_cite_digits                              = ocn_emit(OCNstatus.reset);
biblio_arr_json                              = [];
obj_cite_digit_                              = 0;
html_segnames_ptr                            = 0;
html_segnames_ptr_cntr                       = 0;
content_non_header                           = "8";
dom_structure_markedup_tags_status           = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
dom_structure_markedup_tags_status_buffer    = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
dom_structure_collapsed_tags_status          = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
dom_structure_collapsed_tags_status_buffer   = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
#+END_SRC

*** doc_has struct

#+name: abs_struct_doc_has
#+BEGIN_SRC d
auto doc_has() {
  struct DocHas_ {
    uint inline_links() {
      return dochas["inline_links"];
    }
    uint inline_notes_reg() {
      return dochas["inline_notes"];
    }
    uint inline_notes_star() {
      return dochas["inline_notes_star"];
    }
    uint codeblocks() {
      return dochas["codeblock"];
    }
    uint tables() {
      return dochas["table"];
    }
    uint blocks() {
      return dochas["block"];
    }
    uint groups() {
      return dochas["group"];
    }
    uint poems() {
      return dochas["poem"];
    }
    uint quotes() {
      return dochas["quote"];
    }
    ulong images() { // TODO not ideal rethink
      return (image_list.to!string.strip("[","]").split(",").length);
    }
    auto imagelist() {
      return image_list;
    }
    auto keys_seq() {
      return docSectKeysSeq!()(document_section_keys_sequenced);
    }
    string[] segnames_lv4() {
      return segnames_4;
    }
    string[] segnames_lv_0_to_4() {
      return segnames_0_to_4;
    }
    string[string][string] tag_associations() {
      return tag_assoc;
    }
  }
  return DocHas_();
}
#+END_SRC

*** _return document tuple_ [#A]                               :return:tuple:

#+name: abs_return_tuple
#+BEGIN_SRC d
auto t = tuple(
  document_the,
  doc_has,
);
return t;
#+END_SRC

** 5. Functions                                          :abstract:function:

functions used in document abstraction

*** set & resets                                                    :reset:
**** object reset: remove (clean)                          :object:remove:

#+name: abs_functions_object_reset
#+BEGIN_SRC d
static string[string] object_reset()(string[string] an_object) {
  an_object.remove("body_nugget");
  an_object.remove("substantive");
  an_object.remove("is");
  an_object.remove("attrib");
  an_object.remove("bookindex_nugget");
  return an_object;
}
#+END_SRC

**** set, initialize or re-initialize                                :set:

#+name: abs_functions_header_set_common
#+BEGIN_SRC d
void flow_common_reset_()(
  return ref int[string]     line_occur,
  return ref string[string]  an_object,
  return ref int[string]     obj_type_status,
) {
  line_occur["heading"]      = State.off;
  line_occur["para"]         = State.off;
  obj_type_status["heading"] = State.off;
  obj_type_status["para"]    = State.off;
  an_object                  = an_object.object_reset;
}
#+END_SRC

*** check object_number status in document                            :ocn:

#+name: abs_functions_ocn_status
#+BEGIN_SRC d
static int[string]         _check_ocn_status_()(
  char[]           line,
  int[string]      obj_type_status,
) {
  static auto rgx = Rgx();
  if (!(line.empty)
    && (obj_type_status["ocn_status_off_for_multiple_objects"] == OCN_off_block_status.off)
  ) {
    /+ not multi-line object, check whether object_number is on or turned off +/
    if (line.matchFirst(rgx.object_number_block_marks)) {                      /+ switch off object_number +/
      if (line.matchFirst(rgx.object_number_off_block)) {
        obj_type_status["ocn_status_off_for_multiple_objects"] = OCN_off_block_status.on;
        obj_type_status["ocn_status"]                          = OCNstatus.off;
        debug(ocnoff) {
          writeln(line);
        }
      }
      if (line.matchFirst(rgx.object_number_off_block_dummy_heading)) {
        obj_type_status["ocn_status_off_for_multiple_objects"] = OCN_off_block_status.on;
        obj_type_status["heading_off_for_multiple_objects"]    = Status.on;
        obj_type_status["ocn_status"]                          = OCNstatus.off;
        debug(ocnoff) {
          writeln(line);
        }
      }
    } else {
      if (obj_type_status["ocn_status_off_for_multiple_objects"] == OCN_off_block_status.off) {
        obj_type_status["dummy_heading_status"] = Status.off;
        if (obj_type_status["heading_off_for_multiple_objects"]) {
          obj_type_status["dummy_heading_status"] = Status.on;
        }
        if (line.matchFirst(rgx.object_number_off)) {
          obj_type_status["ocn_status"] = OCNstatus.off;
        } else if (line.matchFirst(rgx.object_number_off_dummy_heading)) {
          obj_type_status["ocn_status"]           = OCNstatus.off;
          obj_type_status["dummy_heading_status"] = Status.on;
        } else {
          obj_type_status["ocn_status"]           = OCNstatus.on;
          obj_type_status["dummy_heading_status"] = Status.off;
        }
      } else {
        obj_type_status["ocn_status"]             = obj_type_status["ocn_status_off_for_multiple_objects"];
      }
    }
  } else if (
    !(line.empty)
    && (obj_type_status["ocn_status_off_for_multiple_objects"] > OCN_off_block_status.off)
  ) {
    if (line.matchFirst(rgx.object_number_off_block_close)) {
      obj_type_status["ocn_status_off_for_multiple_objects"] = OCN_off_block_status.off;
      obj_type_status["ocn_status"]                          = OCNstatus.on;
      obj_type_status["dummy_heading_status"]                = Status.off;
      debug(ocnoff) {
        writeln(line);
      }
    }
  }
  return obj_type_status;
}
#+END_SRC

*** make substitutions
**** project

#+name: abs_functions_substitutions
#+BEGIN_SRC d
char[] _doc_header_and_make_substitutions_(CMM)(
  char[]  line,
  CMM     conf_make_meta,
) {
  enum Substitute { match, markup, }
  if (conf_make_meta.make.substitute) {
    foreach(substitution_pair; conf_make_meta.make.substitute) {
      line = line.replaceAll(
        regex("\b" ~ substitution_pair[Substitute.match]),
        substitution_pair[Substitute.markup]
      );
    }
  }
  return line;
}
#+END_SRC

**** fontface

#+name: abs_functions_substitutions
#+BEGIN_SRC d
char[] _doc_header_and_make_substitutions_fontface_(CMM)(
  char[]  line,
  CMM     conf_make_meta,
) {
  enum Substitute { match, markup, }
  if ( conf_make_meta.make.bold) {
    line = line.replaceAll(
      regex("\b" ~ conf_make_meta.make.bold[Substitute.match]),
      conf_make_meta.make.bold[Substitute.markup]
    );
  }
  if (conf_make_meta.make.emphasis) {
    line = line.replaceAll(
      regex("\b" ~ conf_make_meta.make.emphasis[Substitute.match]),
      conf_make_meta.make.emphasis[Substitute.markup]
    );
  }
  if (conf_make_meta.make.italics) {
    line = line.replaceAll(
      regex("\b" ~ conf_make_meta.make.italics[Substitute.match]),
      conf_make_meta.make.italics[Substitute.markup]
    );
  }
  return line;
}
#+END_SRC

*** block                                                           :block:
**** block start (open) block                                      :start:
***** { block starts function

#+name: abs_functions_block
#+BEGIN_SRC d
void flow_txt_block_start()(
             char[]         line,
  return ref int[string]    obj_type_status,
  return ref uint[string]   dochas,
  return ref string[string] object_number_poem
) {
#+END_SRC

****** block (various) curly open                                :curly:

#+name: abs_functions_block
#+BEGIN_SRC d
  static auto rgx = Rgx();
#+END_SRC

******* code

#+name: abs_functions_block
#+BEGIN_SRC d
  if (auto m = line.matchFirst(rgx.block_curly_code_open)) {
    dochas["codeblock"]++;
    an_object["lang"]              = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["syntax"]            = (m["syntax"]) ? m["syntax"].to!string : "";
    debug(codecurly) {                              // code (curly) open
      writefln(
        "* [code curly] %s",
        line
      );
    }
    obj_type_status["blocks"]     = TriState.on;
    obj_type_status["code"]       = TriState.on;
    obj_type_status["curly_code"] = TriState.on;
#+END_SRC

******* poem

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_curly_poem_open)) {
    dochas["poem"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["lang"]              = (m["lang"]) ? m["lang"].to!string : "";
    debug(poem) {                              // poem (curly) open
      writefln(
        "* [poem curly] %s",
        line
      );
    }
    object_number_poem["start"]   = obj_cite_digits.object_number.to!string;
    obj_type_status["blocks"]     = TriState.on;
    obj_type_status["verse_new"]  = State.on;
    obj_type_status["poem"]       = TriState.on;
    obj_type_status["curly_poem"] = TriState.on;
#+END_SRC

******* group

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_curly_group_open)) {
    dochas["group"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["lang"]              = (m["lang"]) ? m["lang"].to!string : "";
    debug(group) {                             // group (curly) open
      writefln(
        "* [group curly] %s",
        line
      );
    }
    obj_type_status["blocks"]      = TriState.on;
    obj_type_status["group"]       = TriState.on;
    obj_type_status["curly_group"] = TriState.on;
#+END_SRC

******* block

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_curly_block_open)) {
    dochas["block"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["lang"]              = (m["lang"]) ? m["lang"].to!string : "";
    debug(block) {                             // block (curly) open
      writefln(
        "* [block curly] %s",
        line
      );
    }
    obj_type_status["blocks"]      = TriState.on;
    obj_type_status["block"]       = TriState.on;
    obj_type_status["curly_block"] = TriState.on;
#+END_SRC

******* quote

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_curly_quote_open)) {
    dochas["quote"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = m["attrib"].to!string;
    an_object["lang"]              = m["lang"].to!string;
    debug(quote) {                             // quote (curly) open
      writefln(
        "* [quote curly] %s",
        line
      );
    }
    obj_type_status["blocks"]      = TriState.on;
    obj_type_status["quote"]       = TriState.on;
    obj_type_status["curly_quote"] = TriState.on;
#+END_SRC

******* table

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_curly_table_open)) {           /+ curly table open +/
    debug(table) {                             // table (curly) open
      writefln(
        "* [table curly] %s",
        line
      );
    }
    dochas["table"] ++;
    an_object["table_head"]        = m["attrib"].to!string;
    an_object["block_type"]        = "curly";
    obj_type_status["blocks"]      = TriState.on;
    obj_type_status["table"]       = TriState.on;
    obj_type_status["curly_table"] = TriState.on;
#+END_SRC

******* table special

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_curly_table_special_markup)) { /+ table: special table block markup syntax! +/
    dochas["table"]++;
    an_object["table_head"]                       = m["attrib"].to!string;
    an_object["block_type"]                       = "special";
    obj_type_status["blocks"]                     = TriState.on;
    obj_type_status["table"]                      = TriState.on;
    obj_type_status["curly_table_special_markup"] = TriState.on;
#+END_SRC

****** block (various) tic open                                    :tic:
******* code

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_tic_code_open)) {
    dochas["codeblock"]++;
    an_object["lang"]              = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["syntax"]            = (m["syntax"]) ? m["syntax"].to!string : "";
    debug(codetic) {                              // code (tic) open
      writefln(
        "* [code tic] %s",
        line
      );
    }
    obj_type_status["blocks"]   = TriState.on;
    obj_type_status["code"]     = TriState.on;
    obj_type_status["tic_code"] = TriState.on;
#+END_SRC

******* poem

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_tic_poem_open)) {
    dochas["poem"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["lang"]              = (m["lang"]) ? m["lang"].to!string : "";
    debug(poem) {                              // poem (tic) open
      writefln(
        "* [poem tic] %s",
        line
      );
    }
    object_number_poem["start"]  = obj_cite_digits.object_number.to!string;
    obj_type_status["blocks"]    = TriState.on;
    obj_type_status["verse_new"] = State.on;
    obj_type_status["poem"]      = TriState.on;
    obj_type_status["tic_poem"]  = TriState.on;
#+END_SRC

******* group

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_tic_group_open)) {
    dochas["group"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["lang"]              = (m["lang"]) ? m["lang"].to!string : "";
    debug(group) {                             // group (tic) open
      writefln(
        "* [group tic] %s",
        line
      );
    }
    obj_type_status["blocks"]    = TriState.on;
    obj_type_status["group"]     = TriState.on;
    obj_type_status["tic_group"] = TriState.on;
#+END_SRC

******* block

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_tic_block_open)) {
    dochas["block"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = (m["attrib"]) ? m["attrib"].to!string : "";
    an_object["lang"]              = (m["lang"]) ? m["lang"].to!string : "";
    debug(block) {                             // block (tic) open
      writefln(
        "* [block tic] %s",
        line
      );
    }
    obj_type_status["blocks"]    = TriState.on;
    obj_type_status["block"]     = TriState.on;
    obj_type_status["tic_block"] = TriState.on;
#+END_SRC

******* quote

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_tic_quote_open)) {
    dochas["quote"]++;
    an_object["syntax"]            = "";
    an_object["attrib"]            = m["attrib"].to!string;
    an_object["lang"]              = m["lang"].to!string;
    debug(quote) {                             // quote (tic) open
      writefln(
        "* [quote tic] %s",
        line
      );
    }
    obj_type_status["blocks"]    = TriState.on;
    obj_type_status["quote"]     = TriState.on;
    obj_type_status["tic_quote"] = TriState.on;
#+END_SRC

******* table

#+name: abs_functions_block
#+BEGIN_SRC d
  } else if (auto m = line.matchFirst(rgx.block_tic_table_open)) {             /+ tic table open +/
    debug(table) {                             // table (tic) open
      writefln(
        "* [table tic] %s",
        line
      );
    }
    dochas["table"] ++;
    an_object["table_head"]      = m["attrib"].to!string;
    an_object["block_type"]      = "tic";
    obj_type_status["blocks"]    = TriState.on;
    obj_type_status["table"]     = TriState.on;
    obj_type_status["tic_table"] = TriState.on;
  }
#+END_SRC

***** }

#+name: abs_functions_block
#+BEGIN_SRC d
}
#+END_SRC

**** block continue (an open block)                             :continue:
***** _code block_ (special status, deal with first)                 :code:

#+name: abs_functions_block_code
#+BEGIN_SRC d
void flow_txt_block_code()(
             char[]          line,
  return ref string[string]  an_object,
  return ref int[string]     obj_type_status
) {
  static auto rgx = Rgx();
  if (obj_type_status["curly_code"] == TriState.on) {
    if (line.matchFirst(rgx.block_curly_code_close)) {
      debug(codecurly) {                                    // code (curly) close
        writeln(line);
      }
      an_object[an_object_key] = an_object[an_object_key]
        .replaceFirst(rgx.newline_eol_delimiter_only, "")
        .stripRight;
      obj_type_status["blocks"]     = TriState.closing;
      obj_type_status["code"]       = TriState.closing;
      obj_type_status["curly_code"] = TriState.off;
    } else {
      debug(codecurly) {                                    // code (curly) line
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";        // code (curly) line
    }
  } else if (obj_type_status["tic_code"] == TriState.on) {
    if (line.matchFirst(rgx.block_tic_close)) {
      debug(codetic) {                                    // code (tic) close
        writeln(line);
      }
      an_object[an_object_key] = an_object[an_object_key]
        .replaceFirst(rgx.newline_eol_delimiter_only, "")
        .stripRight;
      obj_type_status["blocks"]   = TriState.closing;
      obj_type_status["code"]     = TriState.closing;
      obj_type_status["tic_code"] = TriState.off;
    } else {
      debug(codetic) {                                    // code (tic) line
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";        // code (tic) line
    }
  }
}
#+END_SRC

***** biblio block                                               :biblio:
****** biblio tag map

#+name: abs_functions_block_biblio
#+BEGIN_SRC d
final string biblio_tag_map()(string abr) {
  auto btm = [
    "au"           : "author_raw",
    "ed"           : "editor_raw",
    "ti"           : "fulltitle",
    "lng"          : "language",
    "jo"           : "journal",
    "vol"          : "volume",
    "edn"          : "edition",
    "yr"           : "year",
    "pl"           : "place",
    "pb"           : "publisher",
    "pub"          : "publisher",
    "pg"           : "pages",
    "pgs"          : "pages",
    "sn"           : "short_name"
  ];
  return btm[abr];
}
#+END_SRC

******* +consider+

#+name: none
#+BEGIN_SRC d
final string biblio_tag_map_()(string abr) {
  string name;
  switch (abr) {
  case "au"  : name = "author_raw"; break;
  case "ed"  : name = "editor_raw"; break;
  case "ti"  : name = "fulltitle";  break;
  case "lng" : name = "language";   break;
  case "jo"  : name = "journal";    break;
  case "vol" : name = "volume";     break;
  case "edn" : name = "edition";    break;
  case "yr"  : name = "year";       break;
  case "pl"  : name = "place";      break;
  case "pb"  : name = "publisher";  break;
  case "pub" : name = "publisher";  break;
  case "pg"  : name = "pages";      break;
  case "pgs" : name = "pages";      break;
  case "sn"  : name = "short_name"; break;
  default    : name = abr;          break;
  }
  return name;
}
#+END_SRC

****** biblio block

#+name: abs_functions_block_biblio
#+BEGIN_SRC d
void flow_txt_block_biblio(
  char[]                 line,
  return ref int[string] obj_type_status,
  return ref int         bib_entry,
  return ref string      biblio_entry_str_json,
  return ref string[]    biblio_arr_json
) {
  mixin DocReformBiblio;
  auto jsn = BibJsnStr();
  static auto rgx = Rgx();
  if (line.matchFirst(rgx.heading_biblio)
    && obj_type_status["para"]  != State.on
    && obj_type_status["group"] != State.on
    && obj_type_status["block"] != State.on
    && obj_type_status["poem"]  != State.on
    && obj_type_status["table"] != State.on
    && obj_type_status["quote"] != State.on
  ) {
    obj_type_status["glossary_section"] = State.off;
    obj_type_status["biblio_section"]   = TriState.on;
    obj_type_status["blurb_section"]    = State.off;
  }
  if (line.empty) {
    debug {
      debug(biblioblock) {
        writeln("---");
      }
      debug(biblioblockinclude) {
        writeln(biblio_entry_str_json.length);
      }
    }
    if ((bib_entry == State.off)
    && (biblio_entry_str_json.empty)) {
      bib_entry = State.on;
      biblio_entry_str_json = jsn.biblio_entry_tags_jsonstr;
    } else if (!(biblio_entry_str_json.empty)) {
      bib_entry = State.off;
      if (!(biblio_entry_str_json == jsn.biblio_entry_tags_jsonstr)) {
        auto biblio_entry = parseJSON(biblio_entry_str_json);
        if (biblio_entry["fulltitle"].str.empty) {
          writeln("check problem entry (Title missing): ", biblio_entry_str_json);
        } else if ((biblio_entry["author_raw"].str.empty) && (biblio_entry["editor_raw"].str.empty)) {
          writeln("check problem entry (No author and no editor): ", biblio_entry_str_json);
        } else {
          biblio_arr_json ~= biblio_entry_str_json;
        }
        biblio_entry_str_json = jsn.biblio_entry_tags_jsonstr;
      }
    } else { // CHECK ERROR
      writeln("?? 2. ERROR ", biblio_entry_str_json, "??");
      biblio_entry_str_json = "";
    }
  } else if (line.matchFirst(rgx.biblio_tags)) {
    debug(biblioblock) {
      writeln(line);
    }
    auto bt = line.match(rgx.biblio_tags);
    bib_entry = State.off;
    st = bt.captures[1].to!string;
    auto header_tag_value=(bt.captures[2]).to!string;
    JSONValue j = parseJSON(biblio_entry_str_json);
    biblio_tag_name = (st.match(rgx.biblio_abbreviations))
      ? (biblio_tag_map(st))
      : st;
    j.object[biblio_tag_name] = header_tag_value;
    debug(bibliounsortedcheckduplicates) {
      writeln(biblio_tag_name, ": ", header_tag_value);
      writeln("--");
    }
    switch (biblio_tag_name) {
    case "author_raw": // author_arr author (fn sn)
      j["author_arr"]
       = header_tag_value.split(rgx.arr_delimiter);
      string tmp;
      biblioAuthorLoop:
      foreach (au; j["author_arr"].array) {
        if (auto x = au.str.match(rgx.name_delimiter)) {
          tmp ~= x.captures[2] ~ " " ~ x.captures[1] ~ ", ";
        } else {
          tmp ~= au.str;
        }
      }
      tmp = tmp.replace(rgx.trailing_comma, "");
      j["author"].str = tmp;
      goto default;
    case "editor_raw": // editor_arr editor (fn sn)
      j["editor_arr"]
        = header_tag_value.split(rgx.arr_delimiter);
      string tmp;
      biblioEditorLoop:
      foreach (ed; j["editor_arr"].array) {
        if (auto x = ed.str.match(rgx.name_delimiter)) {
          tmp ~= x.captures[2] ~ " " ~ x.captures[1] ~ ", ";
        } else {
          tmp ~= ed.str;
        }
      }
      tmp = tmp.replace(rgx.trailing_comma, "");
      j["editor"].str = tmp;
      goto default;
    case "fulltitle": // title & subtitle
      goto default;
    default:
      break;
    }
    auto s = j.toString();
    debug(biblio1) {
      writefln(
        "* %s: %s\n%s",
        biblio_tag_name,
        biblio_tag_entry,
        j[biblio_tag_name]
      );
    }
    if (line.match(rgx.comment)) {
      writeln("ERROR", line, "COMMENT");
      writeln("ERROR", s, "%%");
    }
    if (!(match(line, rgx.comment))) {
      debug(biblioblockinclude) {
        writeln(line);
      }
      biblio_entry_str_json = s;
    } else {
      biblio_entry_str_json = "";
    }
    header_tag_value="";
  }
}
#+END_SRC

***** quote block                                                 :quote:

#+name: abs_functions_block_quote
#+BEGIN_SRC d
string[string] flow_txt_block_quote()(
             char[]          line,
             string[string]  an_object,
  return ref int[string]     obj_type_status
) {
  static auto rgx = Rgx();
  if (obj_type_status["curly_quote"] == TriState.on) {
    if (line.matchFirst(rgx.block_curly_quote_close)) {
      debug(quote) {                              // quote (curly) close
        writeln(line);
      }
      an_object[an_object_key]       = an_object[an_object_key].stripRight;
      obj_type_status["blocks"]      = TriState.closing;
      obj_type_status["quote"]       = TriState.closing;
      obj_type_status["curly_quote"] = TriState.off;
    } else {
      debug(quote) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";   // build quote array (or string)
    }
  } else if (obj_type_status["tic_quote"] == TriState.on) {
    if (line.matchFirst(rgx.block_tic_close)) {
      debug(quote) {                              // quote (tic) close
        writeln(line);
      }
      an_object[an_object_key]     = an_object[an_object_key].stripRight;
      obj_type_status["blocks"]    = TriState.closing;
      obj_type_status["quote"]     = TriState.closing;
      obj_type_status["tic_quote"] = TriState.off;
    } else {
      debug(quote) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";   // build quote array (or string)
    }
  }
  return an_object;
}
#+END_SRC

***** group block                                                 :group:

- apply inline markup
- discard leading and newline whitespace

#+name: abs_functions_block_group
#+BEGIN_SRC d
string[string] flow_txt_block_group()(
             char[]          line,
             string[string]  an_object,
  return ref int[string]     obj_type_status
) {
  static auto rgx = Rgx();
  if (obj_type_status["curly_group"] == State.on) {
    if (line.matchFirst(rgx.block_curly_group_close)) {
      debug(group) {
        writeln(line);
      }
      an_object[an_object_key]       = an_object[an_object_key].stripRight;
      obj_type_status["blocks"]      = TriState.closing;
      obj_type_status["group"]       = TriState.closing;
      obj_type_status["curly_group"] = TriState.off;
    } else {
      debug(group) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";   // build group array (or string)
    }
  } else if (obj_type_status["tic_group"] == TriState.on) {
    if (line.matchFirst(rgx.block_tic_close)) {
      debug(group) {
        writeln(line);
      }
      an_object[an_object_key]     = an_object[an_object_key].stripRight;
      obj_type_status["blocks"]    = TriState.closing;
      obj_type_status["group"]     = TriState.closing;
      obj_type_status["tic_group"] = TriState.off;
    } else {
      debug(group) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";   // build group array (or string)
    }
  }
  return an_object;
}
#+END_SRC

***** block block                                                 :block:

- apply inline markup
- keep whitespace indentation
- keep newlines

#+name: abs_functions_block_block
#+BEGIN_SRC d
string[string] flow_txt_block_block()(
             char[]          line,
             string[string]  an_object,
  return ref int[string]     obj_type_status
) {
  static auto rgx = Rgx();
  if (obj_type_status["curly_block"] == TriState.on) {
    if (line.matchFirst(rgx.block_curly_block_close)) {
      debug(block) {                             // block (curly) close
        writeln(line);
      }
      an_object[an_object_key]       = an_object[an_object_key].stripRight;
      obj_type_status["blocks"]      = TriState.closing;
      obj_type_status["block"]       = TriState.closing;
      obj_type_status["curly_block"] = TriState.off;
    } else {
      debug(block) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";   // build block array (or string)
    }
  } else if (obj_type_status["tic_block"] == TriState.on) {
    if (line.matchFirst(rgx.block_tic_close)) {
      debug(block) {
        writeln(line);
      }
      an_object[an_object_key]     = an_object[an_object_key].stripRight;
      obj_type_status["blocks"]    = TriState.closing;
      obj_type_status["block"]     = TriState.closing;
      obj_type_status["tic_block"] = TriState.off;
    } else {
      debug(block) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";   // build block array (or string)
    }
  }
  return an_object;
}
#+END_SRC

***** poem block, verse objects                              :poem:verse:

why extra object stuff only in poem/verse?

#+name: abs_functions_block_poem
#+BEGIN_SRC d
string[string]  flow_txt_block_poem(CMM)(
             char[]          line,
             string[string]  an_object,
  return ref int[string]     obj_type_status,
  return ref int             cntr,
             string[string]  object_number_poem,
             CMM             conf_make_meta,
             string[string]  tag_in_seg,
) {
  static auto rgx = Rgx();
  if (obj_type_status["curly_poem"] == TriState.on) {
    if (line.matchFirst(rgx.block_curly_poem_close)) {
      if (an_object_key in an_object
      || processing.length > 0) {
        an_object[an_object_key]                    = "";
        debug(poem) {
          writefln(
            "* [poem curly] %s",
            line
          );
        }
        if (processing.length > 0) {
          an_object[an_object_key] = processing["verse"];
        }
        debug(poem) {
          writeln(__LINE__);
          writefln(
            "* %s %s",
            obj_cite_digits.object_number,
            line
          );
        }
        if (an_object.length > 0) {
          debug(poem) {                             // poem (curly) close
            writeln(
              obj_cite_digits.object_number,
              an_object[an_object_key]
            );
          }
          an_object["is"]                           = "verse";
          auto substantive_obj_misc_tuple
            = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
          an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
          anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
          comp_obj_block                                 = comp_obj_block.init;
          comp_obj_block.metainfo.is_of_part             = "body";
          comp_obj_block.metainfo.is_of_section          = "body";
          comp_obj_block.metainfo.is_of_type             = "block";
          comp_obj_block.metainfo.is_a                   = "verse";
          comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
          comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
          comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
          comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
          comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
          comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
          comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
          comp_obj_block.text                            = an_object["substantive"];
          comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
          comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
          comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
          the_document_body_section                      ~= comp_obj_block;
          tag_assoc                                      = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
        }
        object_reset(an_object);
        processing.remove("verse");
        ++cntr;
      }
      object_number_poem["end"]     = obj_cite_digits.object_number.to!string;
      obj_type_status["blocks"]     = TriState.closing;
      obj_type_status["poem"]       = TriState.closing;
      obj_type_status["curly_poem"] = TriState.off;
    } else {
      processing["verse"] ~= line ~= "\n";
      if (obj_type_status["verse_new"] == State.on) {
        obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
        obj_type_status["verse_new"] = State.off;
      } else if (line.matchFirst(rgx.newline_eol_delimiter_only)) {
        processing["verse"] = processing["verse"].stripRight;
        verse_line = TriState.off;
        obj_type_status["verse_new"] = State.on;
      }
      if (obj_type_status["verse_new"] == State.on) {
        verse_line=1;
        an_object[an_object_key] = processing["verse"];
        debug(poem) {                          // poem verse
          writefln(
            "* %s curly\n%s",
            obj_cite_digits.object_number,
            an_object[an_object_key]
          );
        }
        processing.remove("verse");
        an_object["is"]                           = "verse";
        auto comp_obj_location = node_construct.node_location_emitter(
          content_non_header,
          tag_in_seg,
          lev_anchor_tag,
          tag_assoc,
          obj_cite_digits,
          cntr,
          heading_ptr-1,
          an_object["is"]
        );
        auto substantive_obj_misc_tuple
          = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
        an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
        anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
        comp_obj_block                                 = comp_obj_block.init;
        comp_obj_block.metainfo.is_of_part             = "body";
        comp_obj_block.metainfo.is_of_section          = "body";
        comp_obj_block.metainfo.is_of_type             = "block";
        comp_obj_block.metainfo.is_a                   = "verse";
        comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
        comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
        comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
        comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
        comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
        comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
        comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
        comp_obj_block.text                            = an_object["substantive"];
        comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
        comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
        comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
        the_document_body_section                      ~= comp_obj_block;
        tag_assoc                                      = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
        object_reset(an_object);
        processing.remove("verse");
        ++cntr;
      }
    }
  } else if (obj_type_status["tic_poem"] == TriState.on) {
    if (auto m = line.matchFirst(rgx.block_tic_close)) { // tic_poem_close
      an_object[an_object_key]="verse";
      debug(poem) {
        writefln(
          "* [poem tic] %s",
          line
        );
      }
      if (processing.length > 0) {
        an_object[an_object_key] = processing["verse"];
      }
      if (an_object.length > 0) {
        debug(poem) {                                     // poem (tic) close
          writeln(__LINE__);
          writeln(obj_cite_digits.object_number, line);
        }
        processing.remove("verse");
        an_object["is"]                                = "verse";
        auto substantive_obj_misc_tuple
          = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
        an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
        anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
        comp_obj_block                                 = comp_obj_block.init;
        comp_obj_block.metainfo.is_of_part             = "body";
        comp_obj_block.metainfo.is_of_section          = "body";
        comp_obj_block.metainfo.is_of_type             = "block";
        comp_obj_block.metainfo.is_a                   = "verse";
        comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
        comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
        comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
        comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
        comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
        comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
        comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
        comp_obj_block.text                            = an_object["substantive"];
        comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
        comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
        comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
        the_document_body_section                      ~= comp_obj_block;
        tag_assoc                                      = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
        object_number_poem["end"]                      = obj_cite_digits.object_number.to!string;
        object_reset(an_object);
        processing.remove("verse");
        ++cntr;
      }
      obj_type_status["blocks"]   = TriState.closing;
      obj_type_status["poem"]     = TriState.closing;
      obj_type_status["tic_poem"] = TriState.off;
    } else {
      processing["verse"] ~= line ~= "\n";
      if (obj_type_status["verse_new"] == State.on) {
        obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
        obj_type_status["verse_new"] = State.off;
      } else if (line.matchFirst(rgx.newline_eol_delimiter_only)) {
        processing["verse"] = processing["verse"].stripRight;
        obj_type_status["verse_new"] = State.on;
        verse_line = TriState.off;
      }
      if (obj_type_status["verse_new"] == State.on) {
        verse_line=1;
        an_object[an_object_key] = processing["verse"];
        debug(poem) {                            // poem (tic) close
          writefln(
            "* %s tic\n%s",
            obj_cite_digits.object_number,
            an_object[an_object_key]
          );
        }
        processing.remove("verse");
        an_object["is"]                           = "verse";
        auto comp_obj_location
          = node_construct.node_location_emitter(
            content_non_header,
            tag_in_seg,
            lev_anchor_tag,
            tag_assoc,
            obj_cite_digits,
            cntr,
            heading_ptr-1,
            an_object["is"]
          );
        auto substantive_obj_misc_tuple
          = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
        an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
        anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
        comp_obj_block                                 = comp_obj_block.init;
        comp_obj_block.metainfo.is_of_part             = "body";
        comp_obj_block.metainfo.is_of_section          = "body";
        comp_obj_block.metainfo.is_of_type             = "block";
        comp_obj_block.metainfo.is_a                   = "verse";
        comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
        comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
        comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
        comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
        comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
        comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
        comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
        comp_obj_block.text                            = an_object["substantive"];
        comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
        comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
        comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
        the_document_body_section                      ~= comp_obj_block;
        tag_assoc                                      = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
        object_reset(an_object);
        processing.remove("verse");
        ++cntr;
      }
    }
  }
  return an_object;
}
#+END_SRC

***** table block                                                 :table:

there are 3 types of table markup that need to be nomalized (given a single representation) here

- curly brace block
- tic block
- special notation block

you need:
- identify the type for the munging to create uniform presentation
  - curly, tick, special
  - table heading row, bool
- present table header info in uniform way
  - table_number_of_columns, int (count)
  - table_column_widths, int[] column widths (as given or calculate average)
  - show table walls, bool
- table content marked up in uniform way

#+name: abs_functions_block_table
#+BEGIN_SRC d
string[string] flow_txt_block_table(CMM)(
             char[]          line,
             string[string]  an_object,
  return ref int[string]     obj_type_status,
  return ref CMM             conf_make_meta,
) {
  static auto rgx = Rgx();
  if (obj_type_status["curly_table"] == TriState.on) {
    if (line.matchFirst(rgx.block_curly_table_close)) {
      debug(table) {                           // table (curly) close
        writeln(line);
      }
      obj_type_status["blocks"]      = TriState.closing;
      obj_type_status["table"]       = TriState.closing;
      obj_type_status["curly_table"] = TriState.off;
    } else {
      debug(table) {                           // table
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";           // build table array (or string)
    }
  } else if (obj_type_status["curly_table_special_markup"] == TriState.on) {
    if (line.empty) {
      obj_type_status["blocks"]                     = TriState.off;
      obj_type_status["table"]                      = TriState.off;
      obj_type_status["curly_table_special_markup"] = TriState.off;
      line.flow_table_closed_make_special_notation_table_(
        an_object,
        the_document_body_section,
        obj_cite_digits,
        comp_obj_heading,
        cntr,
        obj_type_status,
        conf_make_meta,
      );
    } else {
      debug(table) {
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";
    }
  } else if (obj_type_status["tic_table"] == TriState.on) {
    if (line.matchFirst(rgx.block_tic_close)) {
      debug(table) {                           // table (tic) close
        writeln(line);
      }
      obj_type_status["blocks"]    = TriState.closing;
      obj_type_status["table"]     = TriState.closing;
      obj_type_status["tic_table"] = TriState.off;
    } else {
      debug(table) {                           // table
        writeln(line);
      }
      an_object[an_object_key] ~= line ~= "\n";           // build table array (or string)
    }
  }
  return an_object;
}
#+END_SRC

**** special table notation, make: table

process and use an_object["table_head"] (then empty it)
- present table header info in uniform way
  - table_number_of_columns, int (count)
  - table_column_widths, int[] column widths (as given or calculate average)
  - show table walls, bool

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
void flow_table_closed_make_special_notation_table_(N,CMM)(
             char[]                line,
  return ref string[string]        an_object,
  return ref ObjGenericComposite[] the_document_body_section,
  return ref N                     obj_cite_digits,
  return ref ObjGenericComposite   _comp_obj_heading,
  return ref int                   cntr,
  return ref int[string]           obj_type_status,
  CMM                              conf_make_meta
) {
  comp_obj_block = comp_obj_block.init;
  obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
  auto comp_obj_location
    = node_construct.node_location_emitter(
      content_non_header,
      tag_in_seg,
      lev_anchor_tag,
      tag_assoc,
      obj_cite_digits,
      cntr,
      heading_ptr-1,
      "table"
    );
  an_object["is"] = "table";
  auto substantive_obj_misc_tuple
    = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, "body_nugget", conf_make_meta, No._new_doc);
  an_object["substantive"]                       = substantive_obj_misc_tuple[sObj.content];
  comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
  comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
  comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
  comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
  comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
  comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
  comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
  comp_obj_block                                 = comp_obj_block.flow_table_instructions(an_object["table_head"]);
  comp_obj_block                                 = comp_obj_block.flow_table_substantive_munge_special(an_object["substantive"]);
  the_document_body_section                      ~= comp_obj_block;
  object_reset(an_object);
  processing.remove("verse");
  ++cntr;
}
#+END_SRC

**** block end (close an open block): line empty, block flag _makes_ :close:

***** { line empty, _make block_

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
string[string] flow_block_flag_line_empty_(B,N,CMM,Ts)(
             char[]                   line,
             string[string]           an_object,
             B                        bookindex_extract_hash,
  return ref ObjGenericComposite[]    the_document_body_section,
  return ref string[][string][string] bookindex_unordered_hashes,
  return ref N                        obj_cite_digits,
  return ref ObjGenericComposite      _comp_obj_heading,
  return ref int                      cntr,
  return ref int[string]              obj_type_status,
  string[string]                      object_number_poem,
  CMM                                 conf_make_meta,
  Ts                                  tag_in_seg,
) {
  assert(
    line.empty,
    "\nline should be empty:\n  \""
    ~ line ~ "\""
  );
  assert(
    (obj_type_status["blocks"] == TriState.closing),
    "code block status: closed"
  );
  assertions_flag_types_block_status_none_or_closed(obj_type_status);
  static auto rgx = Rgx();
#+END_SRC

****** make: quote block

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  if (obj_type_status["quote"] == TriState.closing) {
    obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
    an_object["bookindex_nugget"]
      = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
    bookindex_unordered_hashes
      = bookindex_extract_hash.bookindex_nugget_hash(
        an_object["bookindex_nugget"],
        obj_cite_digits,
        tag_in_seg
      );
    an_object["is"] = "quote";
    auto comp_obj_location
      = node_construct.node_location_emitter(
        content_non_header,
        tag_in_seg,
        lev_anchor_tag,
        tag_assoc,
        obj_cite_digits,
        cntr,
        heading_ptr-1,
        an_object["is"]
      );
    auto substantive_obj_misc_tuple
      = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
    an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
    anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
    comp_obj_block                                 = comp_obj_block.init;
    comp_obj_block.metainfo.is_of_part             = "body";
    comp_obj_block.metainfo.is_of_section          = "body";
    comp_obj_block.metainfo.is_of_type             = "block";
    comp_obj_block.metainfo.is_a                   = "quote";
    comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
    comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
    comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
    comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
    comp_obj_block.metainfo.object_number_type     = obj_cite_digit_type;
    comp_obj_block.metainfo.lang                   = an_object["lang"];
    comp_obj_block.metainfo.attrib                 = an_object["attrib"];
    comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
    comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
    comp_obj_block.text                            = an_object["substantive"];
    comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
    comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
    comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
    the_document_body_section                      ~= comp_obj_block;
    tag_assoc                                      = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
    obj_type_status["blocks"]                      = TriState.off;
    obj_type_status["quote"]                       = TriState.off;
    object_reset(an_object);
    processing.remove("verse");
    ++cntr;
#+END_SRC

****** make: group block

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  } else if (obj_type_status["group"] == TriState.closing) {
    obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
    an_object["bookindex_nugget"]
      = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
    bookindex_unordered_hashes
      = bookindex_extract_hash.bookindex_nugget_hash(
        an_object["bookindex_nugget"],
        obj_cite_digits,
        tag_in_seg
      );
    an_object["is"] = "group";
    auto comp_obj_location
      = node_construct.node_location_emitter(
        content_non_header,
        tag_in_seg,
        lev_anchor_tag,
        tag_assoc,
        obj_cite_digits,
        cntr,
        heading_ptr-1,
        an_object["is"]
      );
    auto substantive_obj_misc_tuple
      = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
    an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
    anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
    comp_obj_block                                 = comp_obj_block.init;
    comp_obj_block.metainfo.is_of_part             = "body";
    comp_obj_block.metainfo.is_of_section          = "body";
    comp_obj_block.metainfo.is_of_type             = "block";
    comp_obj_block.metainfo.is_a                   = "group";
    comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
    comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
    comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
    comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
    comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
    comp_obj_block.metainfo.lang                   = an_object["lang"];
    comp_obj_block.metainfo.attrib                 = an_object["attrib"];
    comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
    comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
    comp_obj_block.text                            = an_object["substantive"];
    comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
    comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
    comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
    the_document_body_section                      ~= comp_obj_block;
    tag_assoc                                      = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
    obj_type_status["blocks"]                      = TriState.off;
    obj_type_status["group"]                       = TriState.off;
    object_reset(an_object);
    processing.remove("verse");
    ++cntr;
#+END_SRC

****** make: block

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  } else if (obj_type_status["block"] == TriState.closing) {
    obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
    an_object["bookindex_nugget"]
      = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
    bookindex_unordered_hashes
      = bookindex_extract_hash.bookindex_nugget_hash(
        an_object["bookindex_nugget"],
        obj_cite_digits,
        tag_in_seg
      );
    an_object["is"] = "block";
    auto comp_obj_location
      = node_construct.node_location_emitter(
        content_non_header,
        tag_in_seg,
        lev_anchor_tag,
        tag_assoc,
        obj_cite_digits,
        cntr,
        heading_ptr-1,
        an_object["is"]
      );
    auto substantive_obj_misc_tuple
      = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
    an_object["substantive"]                       = substantive_obj_misc_tuple[sObj.content];
    // anchor_tag                                  = substantive_obj_misc_tuple[sObj.anchor_tag];
    comp_obj_block                                 = comp_obj_block.init;
    comp_obj_block.metainfo.is_of_part             = "body";
    comp_obj_block.metainfo.is_of_section          = "body";
    comp_obj_block.metainfo.is_of_type             = "block";
    comp_obj_block.metainfo.is_a                   = "block";
    comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
    comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
    comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
    comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
    comp_obj_block.metainfo.object_number_type     = obj_cite_digit_type;
    comp_obj_block.metainfo.lang                   = an_object["lang"];
    comp_obj_block.metainfo.attrib                 = an_object["attrib"];
    comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
    comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
    comp_obj_block.text                            = an_object["substantive"];
    comp_obj_block.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
    comp_obj_block.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
    comp_obj_block.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
    the_document_body_section                      ~= comp_obj_block;
    obj_type_status["blocks"]                      = TriState.off;
    obj_type_status["block"]                       = TriState.off;
    object_reset(an_object);
    processing.remove("verse");
    ++cntr;
#+END_SRC

****** make: poem

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  } else if (obj_type_status["poem"] == TriState.closing) {
    an_object["bookindex_nugget"]
      = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
    bookindex_unordered_hashes
      = bookindex_extract_hash.bookindex_nugget_hash(
        an_object["bookindex_nugget"],
        obj_cite_digits,
        tag_in_seg
      );
    an_object["is"]                           = "verse";
    auto comp_obj_location
      = node_construct.node_location_emitter(
        content_non_header,
        tag_in_seg,
        lev_anchor_tag,
        tag_assoc,
        obj_cite_digits,
        cntr,
        heading_ptr-1,
        an_object["is"]
      );
    comp_obj_poem_ocn                               = comp_obj_poem_ocn.init;
    comp_obj_poem_ocn.metainfo.is_of_part           = "body";
    comp_obj_poem_ocn.metainfo.is_of_section        = "body";
    comp_obj_poem_ocn.metainfo.is_of_type           = "block";
    comp_obj_poem_ocn.metainfo.is_a                 = "poem";
    comp_obj_poem_ocn.metainfo.ocn                  = obj_cite_digits.object_number;
    comp_obj_poem_ocn.metainfo.identifier           = obj_cite_digits.identifier;
    comp_obj_poem_ocn.metainfo.object_number_off    = obj_cite_digits.off;
    comp_obj_poem_ocn.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
    comp_obj_poem_ocn.metainfo.object_number_type   = obj_cite_digits.type;
    comp_obj_poem_ocn.text                          = "";
    the_document_body_section                       ~= comp_obj_poem_ocn;
    obj_type_status["blocks"]                       = TriState.off;
    obj_type_status["poem"]                         = TriState.off;
    object_reset(an_object);
    processing.remove("verse");
#+END_SRC

****** make: code block

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  } else if (obj_type_status["code"] == TriState.closing) {
    obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
    an_object["bookindex_nugget"]
      = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
    bookindex_unordered_hashes
      = bookindex_extract_hash.bookindex_nugget_hash(
        an_object["bookindex_nugget"],
        obj_cite_digits,
        tag_in_seg
      );
    an_object["is"] = "code";
    auto comp_obj_location
      = node_construct.node_location_emitter(
        content_non_header,
        tag_in_seg,
        lev_anchor_tag,
        tag_assoc,
        obj_cite_digits,
        cntr,
        heading_ptr-1,
        an_object["is"]
      );
    auto substantive_obj_misc_tuple
      = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
    an_object["substantive"] = substantive_obj_misc_tuple[sObj.content];
    anchor_tag = substantive_obj_misc_tuple[sObj.anchor_tag];
    comp_obj_code                                 = comp_obj_code.init;
    comp_obj_code.metainfo.is_of_part             = "body";
    comp_obj_code.metainfo.is_of_section          = "body";
    comp_obj_code.metainfo.is_of_type             = "block";
    comp_obj_code.metainfo.is_a                   = "code";
    comp_obj_code.metainfo.ocn                    = obj_cite_digits.object_number;
    comp_obj_code.metainfo.identifier             = obj_cite_digits.identifier;
    comp_obj_code.metainfo.object_number_off      = obj_cite_digits.off;
    comp_obj_code.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
    comp_obj_code.metainfo.object_number_type     = obj_cite_digits.type;
    comp_obj_code.metainfo.syntax                 = an_object["syntax"];
    comp_obj_code.metainfo.attrib                 = an_object["attrib"];
    comp_obj_code.code_block.linenumbers          = (an_object["attrib"].match(rgx.code_numbering)) ? true : false;
    comp_obj_code.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
    comp_obj_code.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
    comp_obj_code.text                            = an_object["substantive"];
    comp_obj_code.has.inline_notes_reg            = substantive_obj_misc_tuple[sObj.notes_reg];
    comp_obj_code.has.inline_notes_star           = substantive_obj_misc_tuple[sObj.notes_star];
    comp_obj_code.has.inline_links                = substantive_obj_misc_tuple[sObj.links];
    the_document_body_section                     ~= comp_obj_code;
    obj_type_status["blocks"]                     = TriState.off;
    obj_type_status["code"]                       = TriState.off;
    object_reset(an_object);
    processing.remove("verse");
    ++cntr;
#+END_SRC

****** make: table

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  } else if (obj_type_status["table"] == TriState.closing) {
    comp_obj_block = comp_obj_block.init;
    obj_cite_digits = ocn_emit(obj_type_status["ocn_status"]);
    an_object["bookindex_nugget"]
      = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
    bookindex_unordered_hashes
      = bookindex_extract_hash.bookindex_nugget_hash(
        an_object["bookindex_nugget"],
        obj_cite_digits,
        tag_in_seg
      );
    an_object["is"] = "table";
    auto comp_obj_location
      = node_construct.node_location_emitter(
        content_non_header,
        tag_in_seg,
        lev_anchor_tag,
        tag_assoc,
        obj_cite_digits,
        cntr,
        heading_ptr-1,
        an_object["is"]
      );
    auto substantive_obj_misc_tuple
      = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
    an_object["substantive"]                       = substantive_obj_misc_tuple[sObj.content];
    comp_obj_block                                 = comp_obj_block.init;
    comp_obj_block.metainfo.ocn                    = obj_cite_digits.object_number;
    comp_obj_block.metainfo.identifier             = obj_cite_digits.identifier;
    comp_obj_block.metainfo.object_number_off      = obj_cite_digits.off;
    comp_obj_block.tags.html_segment_anchor_tag_is = tag_in_seg["seg_lv4"];
    comp_obj_block.tags.epub_segment_anchor_tag_is = tag_in_seg["seg_lv1_to_4"];
    comp_obj_block.metainfo.o_n_book_index         = obj_cite_digits.bkidx;
    comp_obj_block.metainfo.object_number_type     = obj_cite_digits.type;
    comp_obj_block                                 = comp_obj_block.flow_table_instructions(an_object["table_head"]);
    comp_obj_block                                 = comp_obj_block.flow_table_substantive_munge(an_object["substantive"]);
    the_document_body_section                      ~= comp_obj_block;
    obj_type_status["blocks"]                      = TriState.off;
    obj_type_status["table"]                       = TriState.off;
    object_reset(an_object);
    processing.remove("verse");
    ++cntr;
  }
#+END_SRC

***** }

#+name: abs_functions_block_line_status_empty
#+BEGIN_SRC d
  return an_object;
}
#+END_SRC

*** book index                                                  :bookindex:

#+name: abs_functions_book_index
#+BEGIN_SRC d
string[string] flow_book_index_(B)(
             char[]          line,
             string[string]  an_object,
  return ref string          book_idx_tmp,
  return ref int[string]     obj_type_status,
             B               opt_action,
) {
  static auto rgx = Rgx();
  if (auto m = line.match(rgx.book_index)) {                                   /+ match book_index +/
    debug(bookindexmatch) {
      writefln(
        "* [bookindex] %s\n",
        m["bookindex"].to!string,
      );
    }
    an_object["bookindex_nugget"] = m.captures[1].to!string;
  } else if (auto m = line.match(rgx.book_index_open))  {                      /+ match open book_index +/
    obj_type_status["book_index"] = State.on;
    if (opt_action.backmatter && opt_action.section_bookindex) {
      book_idx_tmp = m.captures[1].to!string;
      debug(bookindexmatch) {
        writefln(
          "* [bookindex] %s\n",
          book_idx_tmp,
        );
      }
    }
  } else if (obj_type_status["book_index"] == State.on )  {                    /+ book_index flag set +/
    if (auto m = line.match(rgx.book_index_close))  {
      obj_type_status["book_index"] = State.off;
      if (opt_action.backmatter
      && opt_action.section_bookindex) {
        an_object["bookindex_nugget"] = book_idx_tmp ~ m.captures[1].to!string;
        debug(bookindexmatch) {
          writefln(
            "* [bookindex] %s\n",
            book_idx_tmp,
          );
        }
      }
      book_idx_tmp = "";
    } else {
      if (opt_action.backmatter
      && opt_action.section_bookindex) {
        book_idx_tmp ~= line;
      }
    }
  }
  return an_object;
}
#+END_SRC

*** heading or paragraph                                :heading:paragraph:
**** heading found                                               :heading:

#+name: abs_functions_heading
#+BEGIN_SRC d
string[string] flow_heading_found_()(
             char[]                line,
             string[string]        heading_match_str,
             string[]              _make_unmarked_headings,
  return ref Regex!(char)[string]  heading_match_rgx,
  return ref int[string]           obj_type_status
) {
  static auto rgx = Rgx();
  if ((_make_unmarked_headings.length > 2)
  && (obj_type_status["make_headings"] == State.off)) {                        /+ headings found +/
    debug(headingsfound) {
      writeln(_make_unmarked_headings);
    }
    debug(headingsfound) {
      writeln(_make_unmarked_headings.length);
      writeln(_make_unmarked_headings);
    }
    switch (_make_unmarked_headings.length) {
    case 7 :
      if (!empty(_make_unmarked_headings[6])) {
        heading_match_str["h_4"]
          = "^(" ~ _make_unmarked_headings[6].to!string ~ ")";
        heading_match_rgx["h_4"]
          = regex(heading_match_str["h_4"]);
      }
      goto case;
    case 6 :
      if (!empty(_make_unmarked_headings[5])) {
        heading_match_str["h_3"]
          = "^(" ~ _make_unmarked_headings[5].to!string ~ ")";
        heading_match_rgx["h_3"]
          = regex(heading_match_str["h_3"]);
      }
      goto case;
    case 5 :
      if (!empty(_make_unmarked_headings[4])) {
        heading_match_str["h_2"]
          = "^(" ~ _make_unmarked_headings[4].to!string ~ ")";
        heading_match_rgx["h_2"]
          = regex(heading_match_str["h_2"]);
      }
      goto case;
    case 4 :
      if (!empty(_make_unmarked_headings[3])) {
        heading_match_str["h_1"]
          = "^(" ~ _make_unmarked_headings[3].to!string ~ ")";
        heading_match_rgx["h_1"]
          = regex(heading_match_str["h_1"]);
      }
      goto case;
    case 3 :
      if (!empty(_make_unmarked_headings[2])) {
        heading_match_str["h_D"]
          = "^(" ~ _make_unmarked_headings[2].to!string ~ ")";
        heading_match_rgx["h_D"]
          = regex(heading_match_str["h_D"]);
      }
      goto case;
    case 2 :
      if (!empty(_make_unmarked_headings[1])) {
        heading_match_str["h_C"]
          = "^(" ~ _make_unmarked_headings[1].to!string ~ ")";
        heading_match_rgx["h_C"]
          = regex(heading_match_str["h_C"]);
      }
      goto case;
    case 1 :
      if (!empty(_make_unmarked_headings[0])) {
        heading_match_str["h_B"]
          = "^(" ~ _make_unmarked_headings[0].to!string ~ ")";
        heading_match_rgx["h_B"]
          = regex(heading_match_str["h_B"]);
      }
      break;
    default:
      break;
    }
    obj_type_status["make_headings"] = State.on;
  }
  return heading_match_str;
}
#+END_SRC

**** heading make set                                            :heading:

#+name: abs_functions_heading
#+BEGIN_SRC d
char[] flow_heading_make_set_()(
             char[]                line,
             int[string]           line_occur,
  return ref Regex!(char)[string]  heading_match_rgx,
  return ref int[string]           obj_type_status
) {
  if ((obj_type_status["make_headings"] == State.on)
  && ((line_occur["para"] == State.off)
  && (line_occur["heading"] == State.off))
  && ((obj_type_status["para"] == State.off)
  && (obj_type_status["heading"] == State.off))) {                             /+ heading make set +/
    if (line.matchFirst(heading_match_rgx["h_B"])) {
      line = "B~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
    if (line.matchFirst(heading_match_rgx["h_C"])) {
      line = "C~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
    if (line.matchFirst(heading_match_rgx["h_D"])) {
      line = "D~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
    if (line.matchFirst(heading_match_rgx["h_1"])) {
      line = "1~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
    if (line.matchFirst(heading_match_rgx["h_2"])) {
      line = "2~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
    if (line.matchFirst(heading_match_rgx["h_3"])) {
      line = "3~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
    if (line.matchFirst(heading_match_rgx["h_4"])) {
      line = "4~ " ~ line;
      debug(headingsfound) {
        writeln(line);
      }
    }
  }
  return line;
}
#+END_SRC

**** heading match                                               :heading:

#+name: abs_functions_heading
#+BEGIN_SRC d
string[string] flow_heading_matched_(CMM)(
             char[]          line,
             string[string]  an_object,
  return ref int[string]     line_occur,
  return ref string          an_object_key,
  return ref int[string]     lv,
  return ref int[string]     collapsed_lev,
  return ref int[string]     obj_type_status,
  return ref CMM             conf_make_meta,
) {
  static auto rgx = Rgx();
  if (auto m = line.match(rgx.heading)) {                                      /+ heading match +/
    ++line_occur["heading"];
    obj_type_status["heading"]            = State.on;
    obj_type_status["para"]               = State.off;
    if (line.match(rgx.heading_seg_and_above)) {
      obj_type_status["glossary_section"] = State.off;
      obj_type_status["biblio_section"]   = State.off;
      obj_type_status["blurb_section"]    = State.off;
    }
    an_object[an_object_key] ~= line ~= "\n";
    an_object["lev"] ~= m.captures[1];
    assertions_doc_structure(an_object, lv); // includes most of the logic for collapsed levels
    switch (an_object["lev"]) {
    case "A":                                // Title set
      if (an_object[an_object_key].match(rgx.variable_doc_title)
      && an_object[an_object_key].match(rgx.variable_doc_author)) {
        an_object[an_object_key] = an_object[an_object_key]
          .replaceFirst(rgx.variable_doc_title,
            (conf_make_meta.meta.title_full ~ ", "))
          .replaceFirst(rgx.variable_doc_author,
            conf_make_meta.meta.creator_author);
      } else if (an_object[an_object_key].match(rgx.variable_doc_title)) {
        an_object[an_object_key] = an_object[an_object_key]
          .replaceFirst(rgx.variable_doc_title,
            conf_make_meta.meta.title_full);
      }
      collapsed_lev["h0"] = 0;
      an_object["lev_collapsed_number"]
        = collapsed_lev["h0"].to!string;
      lv["lv"] = DocStructMarkupHeading.h_sect_A;
      ++lv["h0"];
      lv["h1"] = State.off;
      lv["h2"] = State.off;
      lv["h3"] = State.off;
      lv["h4"] = State.off;
      lv["h5"] = State.off;
      lv["h6"] = State.off;
      lv["h7"] = State.off;
      goto default;
    case "B":
      collapsed_lev["h1"] = collapsed_lev["h0"] + 1;
      an_object["lev_collapsed_number"]
        = collapsed_lev["h1"].to!string;
      lv["lv"] = DocStructMarkupHeading.h_sect_B;
      ++lv["h1"];
      lv["h2"] = State.off;
      lv["h3"] = State.off;
      lv["h4"] = State.off;
      lv["h5"] = State.off;
      lv["h6"] = State.off;
      lv["h7"] = State.off;
      goto default;
    case "C":
      collapsed_lev["h2"] = collapsed_lev["h1"] + 1;
      an_object["lev_collapsed_number"]
        = collapsed_lev["h2"].to!string;
      lv["lv"] = DocStructMarkupHeading.h_sect_C;
      ++lv["h2"];
      lv["h3"] = State.off;
      lv["h4"] = State.off;
      lv["h5"] = State.off;
      lv["h6"] = State.off;
      lv["h7"] = State.off;
      goto default;
    case "D":
      collapsed_lev["h3"] = collapsed_lev["h2"] + 1;
      an_object["lev_collapsed_number"]
        = collapsed_lev["h3"].to!string;
      lv["lv"] = DocStructMarkupHeading.h_sect_D;
      ++lv["h3"];
      lv["h4"] = State.off;
      lv["h5"] = State.off;
      lv["h6"] = State.off;
      lv["h7"] = State.off;
      goto default;
    case "1":
      if (lv["h3"] > State.off) {
        collapsed_lev["h4"] = collapsed_lev["h3"] + 1;
      } else if (lv["h2"] > State.off) {
        collapsed_lev["h4"] = collapsed_lev["h2"] + 1;
      } else if (lv["h1"] > State.off) {
        collapsed_lev["h4"] = collapsed_lev["h1"] + 1;
      } else if (lv["h0"] > State.off) {
        collapsed_lev["h4"] = collapsed_lev["h0"] + 1;
      }
      an_object["lev_collapsed_number"]
        = collapsed_lev["h4"].to!string;
      lv["lv"] = DocStructMarkupHeading.h_text_1;
      ++lv["h4"];
      lv["h5"] = State.off;
      lv["h6"] = State.off;
      lv["h7"] = State.off;
      goto default;
    case "2":
      if (lv["h5"] > State.off) {
        an_object["lev_collapsed_number"]
          = collapsed_lev["h5"].to!string;
      } else if (lv["h4"] > State.off) {
        collapsed_lev["h5"] = collapsed_lev["h4"] + 1;
        an_object["lev_collapsed_number"]
          = collapsed_lev["h5"].to!string;
      }
      lv["lv"] = DocStructMarkupHeading.h_text_2;
      ++lv["h5"];
      lv["h6"] = State.off;
      lv["h7"] = State.off;
      goto default;
    case "3":
      if (lv["h6"] > State.off) {
        an_object["lev_collapsed_number"]
          = collapsed_lev["h6"].to!string;
      } else if (lv["h5"] > State.off) {
        collapsed_lev["h6"] = collapsed_lev["h5"] + 1;
        an_object["lev_collapsed_number"]
          = collapsed_lev["h6"].to!string;
      }
      lv["lv"] = DocStructMarkupHeading.h_text_3;
      ++lv["h6"];
      lv["h7"] = State.off;
      goto default;
    case "4":
      if (lv["h7"] > State.off) {
        an_object["lev_collapsed_number"]
          = collapsed_lev["h7"].to!string;
      } else if (lv["h6"] > State.off) {
        collapsed_lev["h7"] = collapsed_lev["h6"] + 1;
        an_object["lev_collapsed_number"]
          = collapsed_lev["h7"].to!string;
      }
      lv["lv"] = DocStructMarkupHeading.h_text_4;
      ++lv["h7"];
      goto default;
    default:
      an_object["lev_markup_number"] = lv["lv"].to!string;
    }
    an_object["dummy_heading_status"] = (obj_type_status["dummy_heading_status"] == State.off) ? "f" : "t";
    debug(heading) {
      writeln(line.strip);
    }
  }
  return an_object;
}
#+END_SRC

**** para match                                                     :para:

#+name: abs_functions_para
#+BEGIN_SRC d
string[string] flow_para_match_()(
             char[]         line,
             string[string]  an_object,
  return ref string          an_object_key,
  return ref int[string]     indent,
  return ref bool            bullet,
  return ref int[string]     obj_type_status,
  return ref int[string]     line_occur,
) {
  static auto rgx = Rgx();
  if (line_occur["para"] == State.off) {
    line = font_faces_line(line);
    /+ para matches +/
    obj_type_status["para"] = State.on;
    an_object[an_object_key] ~= line;
    indent=[
      "hang_position" : 0,
      "base_position" : 0,
    ];
    bullet = false;
    if (auto m = line.matchFirst(rgx.para_indent)) {
      debug(paraindent) {
        writeln(line);
      }
      indent["hang_position"] = (m["indent"]).to!int;
      indent["base_position"] = (m["indent"]).to!int;
    } else if (line.matchFirst(rgx.para_bullet)) {
      debug(parabullet) {
        writeln(line);
      }
      bullet = true;
    } else if (auto m = line.matchFirst(rgx.para_indent_hang)) {
      debug(paraindenthang) {
        writeln(line);
      }
      indent = [
        "hang_position" : (m["hang"]).to!int,
        "base_position" : (m["indent"]).to!int,
      ];
    } else if (auto m = line.matchFirst(rgx.para_bullet_indent)) {
      debug(parabulletindent) {
        writeln(line);
      }
      indent = [
        "hang_position" : (m["indent"]).to!int,
        "base_position" : (m["indent"]).to!int,
      ];
      bullet = true;
    }
    ++line_occur["para"];
  }
  return an_object;
}
#+END_SRC

**** text font face

#+name: abs_functions_para
#+BEGIN_SRC d
char[] font_faces_line()(
  char[]  textline,
) {
  static auto rgx = Rgx();
  static auto mkup = InlineMarkup();
  if (textline.match(rgx.inline_faces_line)) {
    textline = textline
      .replaceFirst(rgx.inline_emphasis_line,   format(q"┃%s%s%s%s%s%s┃", mkup.emph,       mkup.ff_o, "$1", mkup.ff_c, mkup.emph, "$2"))
      .replaceFirst(rgx.inline_bold_line,       format(q"┃%s%s%s%s%s%s┃", mkup.bold,       mkup.ff_o, "$1", mkup.ff_c, mkup.bold, "$2"))
      .replaceFirst(rgx.inline_underscore_line, format(q"┃%s%s%s%s%s%s┃", mkup.underscore, mkup.ff_o, "$1", mkup.ff_c, mkup.underscore, "$2"))
      .replaceFirst(rgx.inline_italics_line,    format(q"┃%s%s%s%s%s%s┃", mkup.italic,     mkup.ff_o, "$1", mkup.ff_c, mkup.italic, "$2"));
  }
  return textline;
}
#+END_SRC

**** tables

- number of columns
- column widths (either as given or uniform, first often different from rest)
- column aligns (as given else default left for text, check whether can default right for digits)
- table heading (auto align left)
- table walls
- TODO need to be able to align columns left or right (digits)

***** table instructions

#+name: abs_functions_table
#+BEGIN_SRC d
ObjGenericComposite flow_table_instructions(H)(
  return ref ObjGenericComposite  table_object,
             H                    table_head,
) {
  static auto rgx = Rgx();
  table_object.metainfo.is_of_part      = "body";
  table_object.metainfo.is_of_section   = "body";
  table_object.metainfo.is_of_type      = "block";
  table_object.metainfo.is_a            = "table";
  table_object.has.inline_notes_reg     = false;
  table_object.has.inline_notes_star    = false;
  table_object.has.inline_links         = false;
  if (auto m = table_head.matchFirst(rgx.table_head_instructions)) {
    table_object.table.heading
      = ((m["c_heading"].length > 0) && (m["c_heading"] == "h")) ? true : false;
    table_object.table.number_of_columns
      = ((m["c_num"].length > 0) && (m["c_num"].to!int > 0)) ? m["c_num"].to!int : 0;
    foreach (cw; m["c_widths"].matchAll(rgx.table_col_widths)) {
      auto x = cw.hit.matchFirst(rgx.table_col_widths_and_alignment);
      table_object.table.column_widths ~= x["width"].to!int;
      table_object.table.column_aligns ~= (x["align"].empty) ? "" : x["align"];
    }
  }
  return table_object;
}
#+END_SRC

***** table array munge

#+name: abs_functions_table
#+BEGIN_SRC d
ObjGenericComposite flow_table_array_munge(T)(
  return ref ObjGenericComposite  table_object,
  return ref T                    table_array,
) {
  static auto rgx = Rgx();
  static auto mng = InlineMarkup();
  string _table_substantive;
  ulong col_num;
  ulong col_num_;
  ulong col_num_chk = 0;
  foreach(idx_r, row; table_array) {
    debug(table_dev) {
      writeln("row ", idx_r);
    }
    col_num_ = 0;
    if (col_num == 0
    || col_num < row.length) {
      col_num = row.length;
    }
    if (col_num_chk == 0) {
      col_num_chk = col_num;
    } else if (col_num == 1) {
      debug(table_dev) {
        writeln("table note: ");
      }
    } else if (col_num_chk != col_num) {
      debug(table_dev) {
        writeln("warning irregular number of columns: ", col_num_chk, " != ", col_num);
      }
    } else {
    }
    foreach(idx_c, col; row) {
      debug(table_dev) {
        write(idx_c, ", ");
      }
      col_num_ = idx_c;
      _table_substantive ~= col ~ mng.tc_s;
      if (idx_r == 0 && comp_obj_block.table.heading) {
      } else if (col.match(rgx.numeric_col) && idx_r == 1) { // conditions reversed to avoid: gdc compiled program run segfault
        if ((comp_obj_block.table.column_aligns.length > idx_c)
        && (comp_obj_block.table.column_aligns[idx_c].matchFirst(rgx.table_col_align_match))) {
          comp_obj_block.table.column_aligns[idx_c]
            = comp_obj_block.table.column_aligns[idx_c];
        } else if (comp_obj_block.table.column_aligns.length > idx_c) {
          comp_obj_block.table.column_aligns[idx_c] = "r";
        } else {
          comp_obj_block.table.column_aligns ~= "r";
        }
      } else if (idx_r == 1) {
        if ((comp_obj_block.table.column_aligns.length > idx_c)
        && (comp_obj_block.table.column_aligns[idx_c].matchFirst(rgx.table_col_align_match))) {
          comp_obj_block.table.column_aligns[idx_c]
            = comp_obj_block.table.column_aligns[idx_c];
        } else if (comp_obj_block.table.column_aligns.length > idx_c) {
          comp_obj_block.table.column_aligns[idx_c] = "l";
        } else {
          comp_obj_block.table.column_aligns ~= "l";
        }
      }
    }
    debug(table_dev) {
      writeln("");
    }
    if (col_num_chk > 0 && (col_num != col_num_chk)) {
    } else if (col_num == col_num_chk){
    } else {
      col_num_chk = col_num;
    }
    _table_substantive = _table_substantive.replaceFirst(rgx.table_col_separator_nl, "\n");
  }
  if (comp_obj_block.table.number_of_columns != col_num) {
    if (comp_obj_block.table.number_of_columns == 0) {
      comp_obj_block.table.number_of_columns = (col_num).to!int;
    } else {
      debug(table_dev) {
        writeln(comp_obj_block.table.number_of_columns, " != ", col_num);
      }
    }
  }
  if (table_object.table.number_of_columns == 0
  && table_object.table.column_widths.length > 0) {
    writeln(__LINE__, " ERROR");
  }
  if (table_object.table.number_of_columns > 0
  && table_object.table.column_widths.length == 0) {
    double col_w = (100.00 / table_object.table.number_of_columns);
    foreach (i; 0..table_object.table.number_of_columns) {
      table_object.table.column_widths ~= col_w;
    }
  } else if (table_object.table.number_of_columns
  != table_object.table.column_widths.length) {
    debug(table_dev) {
      writeln(m.hit); // further logic required
    }
    if (table_object.table.number_of_columns > table_object.table.column_widths.length) {
      double col_w = (100.00 - (table_object.table.column_widths).sum)
        / (table_object.table.number_of_columns - table_object.table.column_widths.length);
      foreach (i; 0..table_object.table.column_widths.length) {
        table_object.table.column_widths ~= col_w;
      }
      foreach (i; 0..(table_object.table.number_of_columns - table_object.table.column_widths.length)) {
        table_object.table.column_widths ~= col_w;
      }
    } else if (table_object.table.number_of_columns < table_object.table.column_widths.length) {
      writeln(__LINE__, " warning, ERROR");
    }
  }
  if (table_object.table.column_widths.sum > 101
  || table_object.table.column_widths.sum < 95 ) {
    writeln("sum: ", table_object.table.column_widths.sum,
      ", array: ", table_object.table.column_widths,
      ", cols: ", table_object.table.number_of_columns);
    writeln(_table_substantive);
  }
  debug(table_res) {
    writeln("aligns: ", comp_obj_block.table.column_aligns, "\n",
      "no. of columns: ", comp_obj_block.table.number_of_columns, "\n",
      "col widths: ", comp_obj_block.table.column_widths,
        " sum: ", comp_obj_block.table.column_widths.sum, "\n",
      _table_substantive);
  }
  comp_obj_block.text = _table_substantive;
  return table_object;
}
#+END_SRC

***** table substantive munge

#+name: abs_functions_table
#+BEGIN_SRC d
ObjGenericComposite flow_table_substantive_munge(T)(
  return ref ObjGenericComposite  table_object,
  return ref T                    table_substantive,
) {
  static auto rgx = Rgx();
  static auto munge = ObjInlineMarkupMunge();
  string[] _table_rows = (table_substantive).split(rgx.table_row_delimiter);
  string[] _table_cols;
  string[][] _table;
  foreach(col; _table_rows) {
    _table_cols = col.split(rgx.table_col_delimiter);
    _table ~= _table_cols;
  }
  table_object = table_object.flow_table_array_munge(_table);
  return table_object;
}
#+END_SRC

***** table substantive munge special

#+name: abs_functions_table
#+BEGIN_SRC d
ObjGenericComposite flow_table_substantive_munge_special(T)(
  return ref ObjGenericComposite  table_object,
  return ref T                    table_substantive,
) {
  static auto rgx = Rgx();
  static auto munge = ObjInlineMarkupMunge();
  string[] _table_rows = (table_substantive).split(rgx.table_row_delimiter_special);
  string[] _table_cols;
  string[][] _table;
  foreach(col; _table_rows) {
    _table_cols = col.split(rgx.table_col_delimiter_special);
    _table ~= _table_cols;
  }
  table_object = table_object.flow_table_array_munge(_table);
  return table_object;
}
#+END_SRC

*** function emitters                                            :emitters:
**** object                                                       :object:
***** ocn                                                           :ocn:

#+name: meta_emitters_ocn
#+BEGIN_SRC d
pure struct OCNemitter {
  int ocn_digit, ocn_object_number, ocn_on_, ocn_off_, ocn_bkidx, ocn_bkidx_;
  string object_identifier;
  bool ocn_is_off;
  auto ocn_emitter(int ocn_status_flag) {
    OCNset ocn;
    assert(ocn_status_flag <= OCNstatus.reset);
    ocn_object_number = ocn_bkidx = 0;
    object_identifier = "";
    ocn_is_off = false;
    switch(ocn_status_flag) with (OCNstatus) {
    case reset:
      ocn_digit = ocn_on_ = 1;
      object_identifier = "1";
      ocn_is_off = false;
      ocn_off_ = ocn_bkidx_ = 0;
      break;
    case on:
      ocn_digit = ocn_object_number = ++ocn_on_;
      object_identifier = ocn_digit.to!string;
      ocn_is_off = false;
      break;
    case off:
      ocn_digit = 0;
      ocn_off_ = ++ocn_off_;
      object_identifier = "a" ~ ocn_off_.to!string;
      ocn_is_off = true;
      break;
    case bkidx:
      ocn_bkidx = ++ocn_bkidx_;
      break;
    case closing:
      break;
    default:
      ocn_digit = 0;
    }
    assert(ocn_digit >= 0);
    ocn.digit         = ocn_digit;
    ocn.object_number = ocn_object_number; // difference between .object_number and .digit?
    ocn.identifier    = object_identifier;
    ocn.off           = ocn_is_off;
    ocn.bkidx         = ocn_bkidx;
    ocn.type          = ocn_status_flag;
    return ocn;
  }
  invariant() {
  }
}
#+END_SRC

***** object inline markup munge                          :markup:inline:

****** { struct, inline markup munge

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
static struct ObjInlineMarkupMunge {
  string[string] obj_txt;
  int n_foot, n_foot_reg, n_foot_sp_asterisk, n_foot_sp_plus;
  string asterisks_, plus_;
  string obj_txt_out, tail, note;
  static auto rgx = Rgx();
  static auto mkup = InlineMarkup();
  int stage_reset_note_numbers = true;
  private auto initialize_note_numbers() {
    n_foot = 0;
    n_foot_reg = 0;
    n_foot_sp_asterisk = 0;
    n_foot_sp_plus = 0;
  }
#+END_SRC

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  static auto images()(string obj_txt_in) {
    static auto mng = InlineMarkup();
    /+ url matched +/
    obj_txt_in = obj_txt_in.replaceAll(rgx.inline_notes_al_special, ""); // TODO reinstate when special footnotes are implemented
    if (obj_txt_in.match(rgx.smid_image_generic)) {                            /+ images with and without links +/
      debug(images) {
        writeln("Image: ", obj_txt_in);
      }
      if (obj_txt_in.match(rgx.smid_image_with_dimensions)) {
        obj_txt_in = obj_txt_in
          .replaceAll(rgx.smid_image_with_dimensions, ("$1" ~ mkup.img ~ "$2,w$3h$4 " ~ "$5"))
          .replaceAll(rgx.smid_image_delimit, ("$1"
            ~ mkup.lnk_o ~ "$2".strip ~ mkup.lnk_c
            ~ mkup.url_o ~ mkup.url_c));
        debug(images) {
          writeln("IMAGE with size: ", obj_txt_in);
        }
      } else if (obj_txt_in.match(rgx.smid_image)) {
        obj_txt_in = obj_txt_in
          .replaceAll(rgx.smid_image, ("$1" ~ mkup.img ~ "$2,w0h0" ~ "$3"))
          .replaceAll(rgx.smid_image_delimit, ("$1"
            ~ mkup.lnk_o ~ "$2".strip ~ mkup.lnk_c
            ~ mkup.url_o ~ mkup.url_c));
        debug(images) {
          writeln("IMAGE: ", obj_txt_in); // decide on representation
        }
      }
    }
    return obj_txt_in;
  }
#+END_SRC

******* footnotes endnotes markup

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  auto footnotes_endnotes_markup_and_number_or_stars()(string obj_txt_in, bool reset_note_numbers) {
    /+ endnotes (regular) +/
    bool flg_notes_reg  = false;
    bool flg_notes_star = false;
    bool flg_notes_plus = false;
    obj_txt_in = obj_txt_in.replaceAll(
      rgx.inline_notes_curly,
      (mkup.en_a_o ~ " $1" ~ mkup.en_a_c)
    );
    if (!(stage_reset_note_numbers) && reset_note_numbers) {
      stage_reset_note_numbers = true;
    }
    if (obj_txt_in.match(rgx.inline_notes_al_gen)) {
      if (auto m = obj_txt_in.matchAll(rgx.inline_text_and_note_al_)) {
        if (stage_reset_note_numbers) {
          n_foot = 0;
          n_foot_reg = 0;
          n_foot_sp_asterisk = 0;
          n_foot_sp_plus = 0;
        }
        stage_reset_note_numbers = false;
        foreach(n; m) {
          if (n.hit.to!string.match(rgx.inline_al_delimiter_open_symbol_star)) {
            flg_notes_star =  true;
            ++n_foot_sp_asterisk;
            asterisks_ = "*";
            n_foot=n_foot_sp_asterisk;
            obj_txt_out ~= n.hit.to!string.replaceFirst(
              rgx.inline_al_delimiter_open_symbol_star,
              (mkup.en_a_o ~ replicate(asterisks_, n_foot_sp_asterisk) ~ " ")
            ) ~ "\n";
          } else if (n.hit.to!string.match(rgx.inline_al_delimiter_open_symbol_plus)) {
            flg_notes_plus =  true;
            ++n_foot_sp_plus;
            plus_ = "*";
            n_foot=n_foot_sp_plus;
            obj_txt_out ~= n.hit.to!string.replaceFirst(
              rgx.inline_al_delimiter_open_symbol_plus,
              (mkup.en_a_o ~ replicate(plus_, n_foot_sp_plus) ~ " ")
            ) ~ "\n";
          } else if (n.hit.to!string.match(rgx.inline_al_delimiter_open_regular)) {
            flg_notes_reg =  true;
            ++n_foot_reg;
            n_foot=n_foot_reg;
            obj_txt_out ~= n.hit.to!string.replaceFirst(
              rgx.inline_al_delimiter_open_regular,
              (mkup.en_a_o ~ n_foot.to!string ~ " ")
            ) ~ "\n";
          } else {
            obj_txt_out ~= n.hit.to!string ~ "\n";
          }
        }
      }
    } else {
      obj_txt_out = obj_txt_in;
    }
    auto t = tuple(
      obj_txt_out,
      flg_notes_reg,
      flg_notes_star,
      flg_notes_plus,
    );
    return t;
  }
#+END_SRC

******* object notes and links

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  private auto object_notes_and_links_()(
    string obj_txt_in,
    bool reset_note_numbers=false
  ) {
    obj_txt_out = "";
    bool urls = false;
    bool images_without_dimensions = false;
    tail = "";
    /+ special endnotes +/
    obj_txt_in = obj_txt_in.replaceAll(
      rgx.inline_notes_curly_sp_asterisk,
      (mkup.en_a_o ~ "*" ~ " $1" ~ mkup.en_a_c)
    );
    obj_txt_in
      = obj_txt_in.replaceAll(
        rgx.inline_notes_curly_sp_plus,
        (mkup.en_a_o ~ "+" ~ " $1" ~ mkup.en_a_c)
      );
    /+ image matched +/
    if (obj_txt_in.match(rgx.smid_image_generic)) {
      obj_txt_in = images(obj_txt_in);
      if (obj_txt_in.match(rgx.smid_mod_image_without_dimensions)) {
        images_without_dimensions = true;
      }
    }
    /+ url matched +/
    if (obj_txt_in.match(rgx.smid_inline_url)) {
      urls = true;
      obj_txt_in = obj_txt_in.links_and_images;
    }
    if (auto m = obj_txt_in.match(rgx.para_inline_link_anchor)) {
      obj_txt_in = obj_txt_in
        .replaceAll(rgx.para_inline_link_anchor, "┃$1┃");
    }
    auto ftn = footnotes_endnotes_markup_and_number_or_stars(obj_txt_in, reset_note_numbers);
    obj_txt_out = ftn[0];
    debug(footnotes) {
      writeln(obj_txt_out, tail);
    }
    obj_txt_out = obj_txt_out ~ tail;
    debug(footnotesdone) {
      foreach(m; matchAll(obj_txt_out,
      (mkup.en_a_o ~ `\s*(.+?)` ~ mkup.en_a_c))) {
        writeln(m[1]);
        writeln(m.hit);
      }
    }
    auto t = tuple(
      obj_txt_out,
      ftn[1],
      ftn[2],
      ftn[3],
      urls,
      images_without_dimensions,
    );
    return t;
  }
  auto init() {
    auto t = object_notes_and_links_("");
    return t;
  }
  invariant() {
  }
#+END_SRC

******* heading
- identified text by heading level marker followed by text until two new lines
- general markup

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  auto munge_heading()(
    string obj_txt_in,
    bool reset_note_numbers=false
  ) {
    obj_txt["munge"] = obj_txt_in
     .replaceFirst(rgx.heading, "")
     .replaceFirst(rgx.object_number_off_all, "")
     .strip;
    auto t = object_notes_and_links_(obj_txt["munge"], reset_note_numbers);
    debug(munge) {
      writeln(__LINE__);
      writeln(obj_txt_in);
      writeln(__LINE__);
      writeln(obj_txt["munge"].to!string);
    }
    return t;
  }
  invariant() {
  }
#+END_SRC

******* para
- paragraph text without other identification until two new lines
- general markup
  - paragraph attributes
  - font faces (bold, italics, underscore etc.)
  - footnotes/endnotes
  - links

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  auto munge_para()(string obj_txt_in) {
    obj_txt["munge"]=(obj_txt_in)
      .replaceFirst(rgx.para_attribs, "")
      .replaceFirst(rgx.object_number_off_all, "");
    auto t = object_notes_and_links_(obj_txt["munge"]);
    debug(munge) {
      writeln(__LINE__);
      writeln(obj_txt_in);
      writeln(__LINE__);
      writeln(obj_txt["munge"].to!string);
    }
    return t;
  }
#+END_SRC

******* quote

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  string munge_quote()(string obj_txt_in) {
    obj_txt["munge"]=obj_txt_in;
    return obj_txt["munge"];
  }
  invariant() {
  }
#+END_SRC

******* group
- group block identified by open an close tags
- general markup
  - paragraph attributes
  - font faces (bold, italics, underscore etc.)
  - footnotes/endnotes
  - links
- newlines detected and kept?

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  auto munge_group(string obj_txt_in) {
    obj_txt["munge"]=obj_txt_in;
    auto t = object_notes_and_links_(obj_txt["munge"]);
    return t;
  }
  invariant() {
  }
#+END_SRC

******* block
- group block identified by open an close tags
- general markup
  - paragraph attributes
  - font faces (bold, italics, underscore etc.)
  - footnotes/endnotes
  - links
- newlines detected and kept?

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  auto munge_block()(string obj_txt_in) {
    obj_txt["munge"]=obj_txt_in;
    auto t = object_notes_and_links_(obj_txt["munge"]);
    return t;
  }
  invariant() {
  }
#+END_SRC

******* verse (poem)
- sub part of poem block which is identified by open an close tags, separated from other verse by double newline
- newlines
- indentation
- what part of general markup?
  - font faces (bold, italics, underscore etc.)
  - footnotes/endnotes
  - links?

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  auto munge_verse()(string obj_txt_in) {
    obj_txt["munge"]=obj_txt_in;
    auto t = object_notes_and_links_(obj_txt["munge"]);
    return t;
  }
  invariant() {
  }
#+END_SRC

******* code
- newlines
- indentation
- possibly identify syntax for coloring (obj attribute)
- numbered code blocks (markup/obj attribute?)
- no general markup
- one special character represented by mkup.nbsp ░

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  string munge_code()(string obj_txt_in) {
    obj_txt_in = obj_txt_in.replaceAll(rgx.space, mkup.nbsp);
    obj_txt["munge"] = obj_txt_in;
    return obj_txt["munge"];
  }
  invariant() {
  }
#+END_SRC

******* table
- table block identified by open an close tags
- table markup

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  string munge_table()(string obj_txt_in) {
    obj_txt["munge"]=obj_txt_in;
    return obj_txt["munge"];
  }
  invariant() {
  }
#+END_SRC

******* comment

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
  string munge_comment()(string obj_txt_in) {
    obj_txt["munge"]=obj_txt_in;
    return obj_txt["munge"];
  }
  invariant() {
  }
#+END_SRC

****** }

#+name: meta_emitters_obj_inline_markup_munge
#+BEGIN_SRC d
}
#+END_SRC

***** toc, tags, object inline markup                     :markup:inline:
****** {

#+name: meta_emitters_obj_inline_markup
#+BEGIN_SRC d
static struct ObjInlineMarkup {
  static auto rgx = Rgx();
  static auto munge = ObjInlineMarkupMunge();
  string[string] obj_txt;
  static string anchor_tag = "";
#+END_SRC

******* object inline markup and anchor tags              :markup:inline:

#+name: meta_emitters_obj_inline_markup_and_anchor_tags_and_misc
#+BEGIN_SRC d
  auto obj_inline_markup_and_anchor_tags_and_misc(CMM)(
    string[string]   obj_,
    string           obj_key_,
    CMM              conf_make_meta,
    Flag!"_new_doc"  _new_doc
  ) {
    obj_txt["munge"] = obj_[obj_key_].dup;
    obj_txt["munge"] = (obj_["is"].match(ctRegex!(`verse|code`)))
    ? obj_txt["munge"]
    : obj_txt["munge"].strip;
    if (_new_doc) {
      anchor_tag = "";
    }
    auto x = munge.init;
    bool[string] obj_notes_and_links;
    obj_notes_and_links["notes_reg"]           = false;
    obj_notes_and_links["notes_star"]          = false;
    obj_notes_and_links["links"]               = false;
    obj_notes_and_links["image_no_dimensions"] = false;
    if ((obj_["is"] == "para")
      || (obj_["is"] == "heading")
      || (obj_["is"] == "quote")
      || (obj_["is"] == "group")
      || (obj_["is"] == "block")
      || (obj_["is"] == "verse")) {
      obj_txt["munge"] = (obj_txt["munge"]).inline_markup_faces;
      obj_txt["munge"] = (obj_txt["munge"]).links_and_images;
    }
    switch (obj_["is"]) {
    case "heading":
      if (_new_doc) {
        anchor_tag = "";
      }
      obj_txt["munge"]=_configured_auto_heading_numbering_and_segment_anchor_tags(obj_txt["munge"], obj_, conf_make_meta, _new_doc);
      obj_txt["munge"]=_make_segment_anchor_tags_if_none_provided(obj_txt["munge"], obj_["lev"], _new_doc);
      if (auto m = obj_txt["munge"].match(rgx.heading_anchor_tag)) {
        anchor_tag = m.captures[1];
      } else if (obj_["lev"] == "1") {
        writeln("heading anchor tag missing: ", obj_txt["munge"]);
      }
      x = munge.munge_heading(obj_txt["munge"], reset_note_numbers);
      reset_note_numbers=false;
      goto default;
    case "para":
      x = munge.munge_para(obj_txt["munge"]);
      goto default;
    case "group":
      x = munge.munge_group(obj_txt["munge"]);
      goto default;
    case "block":
      x = munge.munge_block(obj_txt["munge"]);
      goto default;
    case "verse":
      x = munge.munge_verse(obj_txt["munge"]);
      goto default;
    case "code":
      obj_txt["munge"] = munge.munge_code(obj_txt["munge"]);
      break;
    case "table":
      obj_txt["munge"] = munge.munge_table(obj_txt["munge"]);
      break;
    case "quote":
      obj_txt["munge"] = munge.munge_quote(obj_txt["munge"]);
      break;
    case "comment":
      obj_txt["munge"] = munge.munge_comment(obj_txt["munge"]);
      break;
    case "doc_end_reset":
      munge.initialize_note_numbers();
      break;
    default:
      /+ para, heading, group, block, verse +/
      obj_txt["munge"]                  = x[0];
      obj_notes_and_links["notes_reg"]  = x[1];
      obj_notes_and_links["notes_star"] = x[2];
      obj_notes_and_links["notes_plus"] = x[3];
      obj_notes_and_links["links"]      = x[4];
      obj_notes_and_links["image_no_dimensions"] = x[5];
      break;
    }
    auto t = tuple(
      obj_txt["munge"],
      anchor_tag,
      obj_notes_and_links["notes_reg"],
      obj_notes_and_links["notes_star"],
      obj_notes_and_links["links"],
      obj_notes_and_links["image_no_dimensions"],
    );
    anchor_tag = "";
    return t;
  }
  invariant() {
  }
#+END_SRC

******* toc (table of contents), build, gather headings   :markup:inline:

#+name: meta_emitters_obj_inline_markup_table_of_contents
#+BEGIN_SRC d
  auto _clean_heading_toc_()(
    char[] heading_toc_,
  ) {
   auto m = (cast(char[]) heading_toc_).matchFirst(rgx.heading);
   heading_toc_ = (m.post).replaceAll(
     rgx.inline_notes_curly_gen,
     "");
   return heading_toc_;
  };
  ObjGenericComposite[] flow_table_of_contents_gather_headings(CMM)(
               string[string]         obj_,
               CMM                    conf_make_meta,
               string[string]         tag_in_seg,
               string                 _anchor_tag,
    return ref string[][string]       lev4_subtoc,
               ObjGenericComposite[]  the_table_of_contents_section,
  ) {
    ObjGenericComposite comp_obj_toc;
    mixin InternalMarkup;
    static auto mkup = InlineMarkup();
    char[] heading_toc_ = (obj_["substantive"].dup.strip.to!(char[])).replaceAll(rgx.inline_notes_al, "");
    heading_toc_ = _clean_heading_toc_(heading_toc_);
    auto attrib="";
    string toc_txt_, subtoc_txt_;
    int[string] indent;
    if (obj_["lev_markup_number"].to!int > 0) {
      indent=[
        "hang_position" : obj_["lev_markup_number"].to!int,
        "base_position" : obj_["lev_markup_number"].to!int,
      ];
      toc_txt_ = format(
        mkup.lnk_o ~ "%s".strip ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
        heading_toc_,
        _anchor_tag,
      );
      toc_txt_= toc_txt_.links_and_images;
      comp_obj_toc                             = comp_obj_toc.init;
      comp_obj_toc.metainfo.is_of_part         = "frontmatter";
      comp_obj_toc.metainfo.is_of_section      = "toc";
      comp_obj_toc.metainfo.is_of_type         = "para";
      comp_obj_toc.metainfo.is_a               = "toc";
      comp_obj_toc.metainfo.ocn                = 0;
      comp_obj_toc.metainfo.identifier         = "";
      comp_obj_toc.metainfo.object_number_off  = true;
      comp_obj_toc.metainfo.object_number_type = 0;
      comp_obj_toc.metainfo.dummy_heading      = (an_object["dummy_heading_status"] == "t") ? true: false;
      comp_obj_toc.attrib.indent_hang          = indent["hang_position"];
      comp_obj_toc.attrib.indent_base          = indent["base_position"];
      comp_obj_toc.attrib.bullet               = false;
      comp_obj_toc.text                        = toc_txt_.to!string.strip;
      comp_obj_toc.has.inline_links            = true;
      the_table_of_contents_section            ~= comp_obj_toc;
    }
    comp_obj_toc                               = comp_obj_toc.init;
    comp_obj_toc.metainfo.is_of_part           = "frontmatter";
    comp_obj_toc.metainfo.is_of_section        = "toc";
    comp_obj_toc.metainfo.is_of_type           = "para";
    comp_obj_toc.metainfo.is_a                 = "toc";
    comp_obj_toc.metainfo.ocn                  = 0;
    comp_obj_toc.metainfo.identifier           = "";
    comp_obj_toc.metainfo.object_number_off    = true;
    comp_obj_toc.metainfo.object_number_type   = 0;
    comp_obj_toc.metainfo.dummy_heading        = (an_object["dummy_heading_status"] == "t") ? true: false;
    comp_obj_toc.attrib.bullet                 = false;
    comp_obj_toc.has.inline_links              = true;
    switch (obj_["lev_markup_number"].to!int) {
    case 0: .. case 3:
      break;
    case 4:
      lev4_subtoc[tag_in_seg["seg_lv4"]] = [];
      break;
    case 5: .. case 7:
      subtoc_txt_ = format(
        mkup.lnk_o ~ "%s".strip ~ mkup.lnk_c ~  mkup.url_o ~ "#%s"~  mkup.url_c,
        heading_toc_,
        _anchor_tag,
      );
      lev4_subtoc[tag_in_seg["seg_lv4"]]
      ~= links_and_images(obj_["lev_markup_number"]
           ~ "~ " ~ subtoc_txt_.to!string.strip
         );
      break;
    default:
      break;
    }
    return the_table_of_contents_section;
  }
  invariant() {
  }
#+END_SRC

******* private:

#+name: meta_emitters_obj_inline_markup_private
#+BEGIN_SRC d
private:
#+END_SRC

******** make heading number & segment anchor tags if instructed :markup:inline:segment:anchor:tags:

#+name: meta_emitters_obj_inline_markup_heading_numbering_segment_anchor_tags
#+BEGIN_SRC d
  static int[] heading_num = [ 0, 0, 0, 0 ];
  static string heading_number_auto_composite = "";
  static string heading_number_auto_composite_segname = "";
  static bool[] auto_heading_numbering = [ true, true, true, true];
  static string _configured_auto_heading_numbering_and_segment_anchor_tags(CMM)(
    string           munge_,
    string[string]   obj_,
    CMM              conf_make_meta,
    bool             _new_doc,
  ) {
    if (_new_doc) {
      heading_num = [ 0, 0, 0, 0 ];
      heading_number_auto_composite = "";
      auto_heading_numbering = [ true, true, true, true];
    }
    if (conf_make_meta.make.auto_num_top_lv) {
      if (obj_["lev_markup_number"].to!int == 0) {
        heading_num[0] = 0;
        heading_num[1] = 0;
        heading_num[2] = 0;
        heading_num[3] = 0;
        heading_number_auto_composite = "";
      }
      /+ auto_num_depth minimum 0
         (1.) default 2 (1.1.1) max 3 (1.1.1.1) implement +/
      if (
        conf_make_meta.make.auto_num_top_lv
        > obj_["lev_markup_number"].to!uint
      ) {
        heading_num[1] = 0;
        heading_num[2] = 0;
        heading_num[3] = 0;
      } else if (
        conf_make_meta.make.auto_num_top_lv
          == obj_["lev_markup_number"].to!uint
      ) {
        auto_heading_numbering[0] =
          (munge_.match(rgx.auto_heading_numbering_off_lv1)) ? false : true;
        if (auto_heading_numbering[0]) {
          heading_num[0] ++;
        }
        heading_num[1] = 0;
        heading_num[2] = 0;
        heading_num[3] = 0;
      } else if (
        conf_make_meta.make.auto_num_top_lv
          == (obj_["lev_markup_number"].to!uint - 1)
      ) {
        auto_heading_numbering[1] =
          (munge_.match(rgx.auto_heading_numbering_off_lv2)) ? false : true;
        if (auto_heading_numbering[0]
        && auto_heading_numbering[1]) {
          heading_num[1] ++;
        }
        heading_num[2] = 0;
        heading_num[3] = 0;
      } else if (
        conf_make_meta.make.auto_num_top_lv
          == (obj_["lev_markup_number"].to!uint - 2)
      ) {
        auto_heading_numbering[2] =
          (munge_.match(rgx.auto_heading_numbering_off_lv3)) ? false : true;
        if (auto_heading_numbering[0]
        && auto_heading_numbering[1]
        && auto_heading_numbering[2]) {
          heading_num[2] ++;
        }
        heading_num[3] = 0;
      } else if (
        conf_make_meta.make.auto_num_top_lv
          == (obj_["lev_markup_number"].to!uint - 3)
      ) {
        auto_heading_numbering[3] =
          (munge_.match(rgx.auto_heading_numbering_off_lv4)) ? false : true;
        if (auto_heading_numbering[0]
        && auto_heading_numbering[1]
        && auto_heading_numbering[2]
        && auto_heading_numbering[3]) {
          heading_num[3] ++;
        }
      }
      if (auto_heading_numbering[0]) {
        if (heading_num[3] > 0) {
          heading_number_auto_composite
            = (conf_make_meta.make.auto_num_depth.to!uint == 3
              && auto_heading_numbering[3])
            ? (format(q"┃%s.%s.%s.%s┃",
                heading_num[0].to!string,
                heading_num[1].to!string,
                heading_num[2].to!string,
                heading_num[3].to!string
              ))
            : "";
        } else if (heading_num[2] > 0) {
          heading_number_auto_composite
            = ((conf_make_meta.make.auto_num_depth.to!uint >= 2)
              && (conf_make_meta.make.auto_num_depth.to!uint <= 3)
              && auto_heading_numbering[2])
            ? (format(q"┃%s.%s.%s┃",
                heading_num[0].to!string,
                heading_num[1].to!string,
                heading_num[2].to!string
              ))
            : "";
        } else if (heading_num[1] > 0) {
          heading_number_auto_composite
            = ((conf_make_meta.make.auto_num_depth.to!uint >= 1)
              && (conf_make_meta.make.auto_num_depth.to!uint <= 3)
              && auto_heading_numbering[1])
            ? (format(q"┃%s.%s┃",
                heading_num[0].to!string,
                heading_num[1].to!string
              ))
            : "";
        } else if (heading_num[0] > 0
          && munge_.match(rgx.auto_heading_numbering_lv1)
        ) {
          heading_number_auto_composite
            = ((conf_make_meta.make.auto_num_depth.to!uint >= 0)
              && (conf_make_meta.make.auto_num_depth.to!uint <= 3)
              && auto_heading_numbering[0])
            ? (format(q"┃%s┃",
                heading_num[0].to!string
              ))
            : "";
        } else {
          heading_number_auto_composite = "";
        }
      }
      heading_number_auto_composite_segname =
        (heading_number_auto_composite.empty)
          ? ""
          : "seg_" ~ heading_number_auto_composite;
      debug(heading_number_auto) {
        writeln(heading_number_auto_composite);
      }
      if ((!empty(heading_number_auto_composite))
      && (obj_["lev_markup_number"].to!uint >= conf_make_meta.make.auto_num_top_lv)) {
        munge_ = munge_
        .replaceFirst(rgx.heading,
          "$1~$2 " ~ heading_number_auto_composite ~ ". ")
        .replaceFirst(rgx.heading_marker_missing_tag,
          "$1~" ~ heading_number_auto_composite_segname ~ " ");
      }
    }
    return munge_;
  }
#+END_SRC

******** make segment anchor tags if not provided :markup:inline:segment:anchor:tags:

#+name: meta_emitters_obj_inline_markup_heading_numbering_segment_anchor_tags
#+BEGIN_SRC d
  static int heading_num_lev1 = 0;
  static string _make_segment_anchor_tags_if_none_provided()(
    string munge_,
    string lev_,
    bool   _new_doc
  ) {
    if (!(munge_.match(rgx.heading_anchor_tag))) {
      if (munge_.match(rgx.heading_identify_anchor_tag)) {
        if (auto m = munge_.match(rgx.heading_extract_named_anchor_tag)) {
          munge_ = munge_.replaceFirst(
            rgx.heading_marker_missing_tag,
            "$1~" ~ m.captures[1].toLower ~ "_"  ~ m.captures[2] ~ " ");
          if (auto n = munge_.match(rgx.heading_anchor_tag_plus_colon)) {
            auto tag_remunge_ = n.captures[2]
              .replaceAll(rgx.heading_marker_tag_has_colon, "..");
            munge_ = munge_.replaceFirst(rgx.heading_anchor_tag_plus_colon, n.captures[1] ~ tag_remunge_ ~ " ");
          }
        } else if (auto m = munge_.match(rgx.heading_extract_unnamed_anchor_tag)) {
          munge_ = munge_.replaceFirst(
            rgx.heading_marker_missing_tag,
            "$1~" ~ "s" ~ m.captures[1] ~ " ");
        }
      } else if (lev_ == "1") { // (if not successful) manufacture a unique anchor tag for lev=="1"
        if (_new_doc) {
          heading_num_lev1 = 0;
        }
        heading_num_lev1 ++;
        munge_ = munge_.replaceFirst(
          rgx.heading_marker_missing_tag,
          "$1~" ~ "x" ~ heading_num_lev1.to!string ~ " ");
      }
    }
    return munge_;
  }
#+END_SRC

****** }

#+name: meta_emitters_obj_inline_markup_close
#+BEGIN_SRC d
}
#+END_SRC

***** object attrib                                          :attributes:
****** { attributes structure open, public

#+name: meta_emitters_obj_attributes
#+BEGIN_SRC d
struct ObjAttributes {
  string[string] _obj_attrib;
#+END_SRC

******* emitter obj attributes, public

#+name: meta_emitters_obj_attributes_public
#+BEGIN_SRC d
  string obj_attributes()(
    string              obj_is_,
    string              obj_raw,
    ObjGenericComposite _comp_obj_heading,
  ) {
    scope(exit) {
      destroy(obj_is_);
      destroy(obj_raw);
      destroy(_comp_obj_heading);
    }
    _obj_attrib["json"] ="{";
    switch (obj_is_) {
    case "heading":
      _obj_attrib["json"] ~= txt_heading(obj_raw);
      break;
    case "para":
      _obj_attrib["json"] ~= txt_para_and_blocks(obj_raw)
      ~ txt_para(obj_raw);
      break;
    case "code":
      _obj_attrib["json"] ~= txt_code(obj_raw);
      break;
    case "group":
      _obj_attrib["json"] ~= txt_para_and_blocks(obj_raw)
      ~ txt_group(obj_raw);
      break;
    case "block":
      _obj_attrib["json"] ~= txt_para_and_blocks(obj_raw)
      ~ txt_block(obj_raw);
      break;
    case "verse":
      _obj_attrib["json"] ~= txt_verse(obj_raw);
      break;
    case "quote":
      _obj_attrib["json"] ~= txt_quote(obj_raw);
      break;
    case "table":
      _obj_attrib["json"] ~= txt_table(obj_raw);
      break;
    case "comment":
      _obj_attrib["json"] ~= txt_comment(obj_raw);
      break;
    default:
      _obj_attrib["json"] ~= txt_para(obj_raw);
      break;
    }
    _obj_attrib["json"] ~=" }";
    _obj_attrib["json"]=_set_additional_values_parse_as_json(_obj_attrib["json"], obj_is_, _comp_obj_heading);
    debug(structattrib) {
      if (oa_j["is"].str() == "heading") {
        writeln(_obj_attrib["json"]);
        writeln(
          "is: ", oa_j["is"].str(),
          "; object_number: ", oa_j["object_number"].integer()
        );
      }
    }
    return _obj_attrib["json"];
  }
  invariant() {
  }
#+END_SRC

******* private

#+name: meta_emitters_obj_attributes_private
#+BEGIN_SRC d
  private:
  string _obj_attributes;
#+END_SRC

******** para & blocks

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_para_and_blocks()(string obj_txt_in) {
    if (obj_txt_in.matchFirst(rgx.para_bullet)) {
      _obj_attributes =" \"bullet\": \"true\","
      ~ " \"indent_hang\": 0,"
      ~ " \"indent_base\": 0,";
    } else if (auto m = obj_txt_in.matchFirst(rgx.para_bullet_indent)) {
      _obj_attributes =" \"bullet\": \"true\","
      ~ " \"indent_hang\": " ~ m["indent"].to!string ~ ","
      ~ " \"indent_base\": " ~ m["indent"].to!string ~ ",";
    } else if (auto m = obj_txt_in.matchFirst(rgx.para_indent_hang)) {
      _obj_attributes =" \"bullet\": \"false\","
      ~ " \"indent_hang\": " ~ m["hang"].to!string ~ ","
      ~ " \"indent_base\": " ~ m["indent"].to!string ~ ",";
    } else if (auto m = obj_txt_in.matchFirst(rgx.para_indent)) {
      _obj_attributes =" \"bullet\": \"false\","
      ~ " \"indent_hang\": " ~ m["indent"].to!string ~ ","
      ~ " \"indent_base\": " ~ m["indent"].to!string ~ ",";
    } else {
      _obj_attributes =" \"bullet\": \"false\","
      ~ " \"indent_hang\": 0,"
      ~ " \"indent_base\": 0,";
    }
    return _obj_attributes;
  }
#+END_SRC

******** heading

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_heading()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"para\","
    ~ " \"is\": \"heading\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** para

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_para()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"para\","
    ~ " \"is\": \"para\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** quote

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_quote()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"block\","
    ~ " \"is\": \"quote\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** group

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_group()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"block\","
    ~ " \"is\": \"group\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** block

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_block()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"block\","
    ~ " \"is\": \"block\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** verse

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_verse()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"block\","
    ~ " \"is\": \"verse\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** code

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_code()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"block\","
    ~ " \"is\": \"code\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** table

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_table()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"content\","
    ~ " \"of\": \"block\","
    ~ " \"is\": \"table\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** comment

#+name: meta_emitters_obj_attributes_private_an_attribute
#+BEGIN_SRC d
  string txt_comment()(string obj_txt_in) {
    _obj_attributes = " \"use\": \"comment\","
    ~ " \"of\": \"comment\","
    ~ " \"is\": \"comment\"";
    return _obj_attributes;
  }
  invariant() {
  }
#+END_SRC

******** set additional attribute values, parse as json

#+name: meta_emitters_obj_attributes_private_json
#+BEGIN_SRC d
  string _set_additional_values_parse_as_json()(
    string              _obj_attrib,
    string              obj_is_,
    ObjGenericComposite _comp_obj_heading,
  ) {
    JSONValue oa_j = parseJSON(_obj_attrib);
    assert(
      (oa_j.type == JSON_TYPE.OBJECT)
    );
    if (obj_is_ == "heading") {
      oa_j.object["object_number"]          = _comp_obj_heading.metainfo.ocn;
      oa_j.object["lev_markup_number"]      = _comp_obj_heading.metainfo.heading_lev_markup;
      oa_j.object["lev_collapsed_number"]   = _comp_obj_heading.metainfo.heading_lev_collapsed;
      oa_j.object["heading_ptr"]
        = _comp_obj_heading.ptr.heading;
      oa_j.object["doc_object_ptr"]
        = _comp_obj_heading.ptr.doc_object;
    }
    oa_j.object["parent_object_number"]     = _comp_obj_heading.metainfo.parent_ocn;
    oa_j.object["parent_lev_markup_number"] = _comp_obj_heading.metainfo.parent_lev_markup;
    _obj_attrib = oa_j.toString();
    return _obj_attrib;
  }
#+END_SRC

****** }

#+name: meta_emitters_obj_attributes_private_close
#+BEGIN_SRC d
}
#+END_SRC

**** book index                                               :book:index:
***** book index nugget hash                                :hash:nugget:

#+name: meta_emitters_book_index_nugget
#+BEGIN_SRC d
struct BookIndexNuggetHash {
  string main_term, sub_term, sub_term_bits;
  int object_number_offset, object_number_endpoint;
  string[] object_numbers;
  string[][string][string] bi_hash_nugget;
  string[] bi_main_terms_split_arr;
  string[][string][string] bookindex_nugget_hash(N,S)(
    string bookindex_section,
    N      obj_cite_digits,
    S      tag_in_seg,
  ) {
    debug(asserts) {
      static assert(is(typeof(obj_cite_digits.object_number) == int));
    }
    debug(bookindexraw) {
      if (!bookindex_section.empty) {
        writeln(
          "* [bookindex] ",
          "[", obj_cite_digits.object_number.to!string, ": ", tag_in_seg["seg_lv4"], "] ", bookindex_section,
          "  - - - ",
          "[", obj_cite_digits.object_number.to!string, "] ", bookindex_section
        );
      }
    }
    static auto rgx = Rgx();
    if (!bookindex_section.empty) {
      auto bi_main_terms_split_arr
        = bookindex_section.split(rgx.bi_main_terms_split);
      foreach (bi_main_terms_content; bi_main_terms_split_arr) {
        auto bi_main_term_and_rest
          = bi_main_terms_content.split(rgx.bi_main_term_plus_rest_split);
        if (auto m = bi_main_term_and_rest[0].match(
          rgx.bi_term_and_object_numbers_match)
        ) {
          main_term = m.captures[1].strip;
          object_number_offset = m.captures[2].to!int;
          object_number_endpoint=(obj_cite_digits.object_number + object_number_offset);
          object_numbers ~= (obj_cite_digits.object_number.to!string
          ~ "-" ~ object_number_endpoint.to!string);
        } else {
          main_term = bi_main_term_and_rest[0].strip;
          object_numbers ~= obj_cite_digits.object_number.to!string;
        }
        bi_hash_nugget[main_term]["_a"] ~= object_numbers;
        object_numbers = null;
        if (bi_main_term_and_rest.length > 1) {
          auto bi_sub_terms_split_arr
            = bi_main_term_and_rest[1].split(
              rgx.bi_sub_terms_plus_object_number_offset_split
            );
          foreach (sub_terms_bits; bi_sub_terms_split_arr) {
            if (auto m = sub_terms_bits.match(rgx.bi_term_and_object_numbers_match)) {
              sub_term = m.captures[1].strip;
              object_number_offset = m.captures[2].to!int;
              object_number_endpoint=(obj_cite_digits.object_number + object_number_offset);
              object_numbers ~= (obj_cite_digits.object_number.to!string
              ~ " - " ~ object_number_endpoint.to!string);
            } else {
              sub_term = sub_terms_bits.strip;
              object_numbers ~= obj_cite_digits.object_number.to!string;
            }
            if (!empty(sub_term)) {
              bi_hash_nugget[main_term][sub_term] ~= object_numbers;
            }
            object_numbers=null;
          }
        }
      }
    }
    return bi_hash_nugget;
  }
  invariant() {
  }
}
#+END_SRC

***** book index (sort &) report indented               :report:indented:

#+name: meta_emitters_book_index_report_indented
#+BEGIN_SRC d
struct BookIndexReportIndent {
  int mkn, skn;
  void bookindex_report_indented()(
    string[][string][string] bookindex_unordered_hashes
  ) {
    auto mainkeys
      = bookindex_unordered_hashes.byKey.array.sort().release;
    foreach (mainkey; mainkeys) {
      debug(bookindex1) {
        writeln(mainkey);
      }
      auto subkeys
        = bookindex_unordered_hashes[mainkey].byKey.array.sort().release;
      foreach (subkey; subkeys) {
        debug(bookindex1) {
          writeln("  ", subkey);
          writeln("    ", to!string(
            bookindex_unordered_hashes[mainkey][subkey]
          ));
        }
        ++skn;
      }
      ++mkn;
    }
  }
}
#+END_SRC

***** book index (sort &) report section                 :report:section:
****** { book index struct open

#+name: meta_emitters_book_index_report_section
#+BEGIN_SRC d
struct BookIndexReportSection {
  int  mkn, skn;
  static auto rgx = Rgx();
  static auto munge = ObjInlineMarkupMunge();
#+END_SRC

******* bookindex write section

#+name: meta_emitters_book_index_report_section
#+BEGIN_SRC d
  void bookindex_write_section()(
    string[][string][string] bookindex_unordered_hashes
  ) {
    auto mainkeys =
      bookindex_unordered_hashes.byKey.array
      .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
    foreach (mainkey; mainkeys) {
      write("_0_1 !┨", mainkey, "┣! ");
      foreach (ref_; bookindex_unordered_hashes[mainkey]["_a"]) {
        auto go = ref_.replaceAll(rgx.book_index_go, "$1");
        write(" {", ref_, "}#", go, ", ");
      }
      writeln(" \\\\");
      bookindex_unordered_hashes[mainkey].remove("_a");
      auto subkeys =
        bookindex_unordered_hashes[mainkey].byKey.array
        .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
      foreach (subkey; subkeys) {
        write("  ", subkey, ", ");
        foreach (ref_; bookindex_unordered_hashes[mainkey][subkey]) {
          auto go = ref_.replaceAll(rgx.book_index_go, "$1");
          write(" {", ref_, "}#", go, ", ");
        }
        writeln(" \\\\");
        ++skn;
      }
      ++mkn;
    }
  }
#+END_SRC

******* book index (sort &) build section                :report:section:

#+name: meta_emitters_book_index_report_section
#+BEGIN_SRC d
  auto bookindex_build_abstraction_section(N,B)(
    string[][string][string] bookindex_unordered_hashes,
    N                        obj_cite_digits,
    B                        opt_action,
  ) {
    debug(asserts) {
      static assert(is(typeof(obj_cite_digits.object_number)             == int));
    }
    mixin DocReformNode;
    mixin InternalMarkup;
    static auto mkup = InlineMarkup();
    string type_is;
    string lev;
    int heading_lev_markup, heading_lev_collapsed;
    string attrib;
    int[string] indent;
    auto mainkeys =
      bookindex_unordered_hashes.byKey.array
      .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
    ObjGenericComposite[] bookindex_section;
    ObjGenericComposite comp_obj_heading_, comp_obj_para;
    auto node_para_int_ = node_metadata_para_int;
    auto node_para_str_ = node_metadata_para_str;
    if ((mainkeys.length > 0)
    && (opt_action.backmatter
    && opt_action.section_bookindex)) {
      string bi_tmp;
      string[] bi_tmp_tags;
      {
        comp_obj_heading_                                = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part            = "backmatter";
        comp_obj_heading_.metainfo.is_of_section         = "bookindex";
        comp_obj_heading_.metainfo.is_of_type            = "para";
        comp_obj_heading_.metainfo.is_a                  = "heading";
        comp_obj_heading_.text                           = "Book Index";
        comp_obj_heading_.metainfo.ocn                   = 0;
        comp_obj_heading_.metainfo.identifier            = "";
        comp_obj_heading_.metainfo.dummy_heading         = false;
        comp_obj_heading_.metainfo.object_number_off     = true;
        comp_obj_heading_.metainfo.object_number_type    = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub   = "_part_book_index";
        comp_obj_heading_.tags.anchor_tag_html           = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html           = "bookindex";
        comp_obj_heading_.tags.anchor_tags               = ["section_bookindex"];
        comp_obj_heading_.metainfo.heading_lev_markup    = 1;
        comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
        comp_obj_heading_.metainfo.parent_ocn            = 1;
        comp_obj_heading_.metainfo.parent_lev_markup     = 0;
        comp_obj_heading.has.inline_links                = true;
        bookindex_section                                ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
        ++mkn;
      }
      {
        comp_obj_heading_                                = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part            = "backmatter";
        comp_obj_heading_.metainfo.is_of_section         = "bookindex";
        comp_obj_heading_.metainfo.is_of_type            = "para";
        comp_obj_heading_.metainfo.is_a                  = "heading";
        comp_obj_heading_.text                           = "Index";
        comp_obj_heading_.metainfo.ocn                   = 0;
        comp_obj_heading_.metainfo.identifier            = "";
        comp_obj_heading_.metainfo.dummy_heading         = true;
        comp_obj_heading_.metainfo.object_number_off     = true;
        comp_obj_heading_.metainfo.object_number_type    = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub   = "bookindex";
        comp_obj_heading_.tags.anchor_tag_html           = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html           = comp_obj_heading_.tags.anchor_tag_html;
        comp_obj_heading_.metainfo.heading_lev_markup    = 4;
        comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
        comp_obj_heading_.metainfo.parent_ocn            = 1;
        comp_obj_heading_.metainfo.parent_lev_markup     = 0;
        comp_obj_heading.has.inline_links                = false;
        comp_obj_heading_.tags.anchor_tags               = ["bookindex"];
        bookindex_section                                ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
        ++mkn;
      }
      import std.array : appender;
      auto buffer = appender!(char[])();
      string[dchar] transTable = [' ' : "_"];
      foreach (mainkey; mainkeys) {
        bi_tmp_tags = [""];
        bi_tmp = mkup.bold ~ mkup.ff_o ~ mainkey ~ mkup.ff_c ~ mkup.bold ~ " ";
        buffer.clear();
        bi_tmp_tags ~= translate(mainkey, transTable);
        auto bkidx_lnk(string locs) {
          string markup = "";
          if (auto m = locs.matchFirst(rgx.book_index_go)) {
            markup
              = links_and_images("{ " ~ m["link"] ~ " }"
              ~ "#" ~ m["ocn"] ~ ", ");
          } else {
            writeln(__LINE__, ": ", locs);
          }
          return markup;
        }
        foreach (ref_; bookindex_unordered_hashes[mainkey]["_a"]) {
          bi_tmp ~= bkidx_lnk(ref_);
        }
        bi_tmp ~= " \\\\\n    ";
        bookindex_unordered_hashes[mainkey].remove("_a");
        auto subkeys =
          bookindex_unordered_hashes[mainkey].byKey.array
          .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
        foreach (subkey; subkeys) {
          bi_tmp ~= subkey ~ ", ";
          buffer.clear();
          bi_tmp_tags ~= translate(subkey, transTable);
          foreach (ref_; bookindex_unordered_hashes[mainkey][subkey]) {
            bi_tmp ~= bkidx_lnk(ref_);
          }
          bi_tmp ~= " \\\\\n    ";
          ++skn;
        }
        bi_tmp                                         = bi_tmp.replaceFirst(rgx.trailing_linebreak, "");
        comp_obj_para                                  = comp_obj_para.init;
        comp_obj_para.metainfo.is_of_part              = "backmatter";
        comp_obj_para.metainfo.is_of_section           = "bookindex";
        comp_obj_para.metainfo.is_of_type              = "para";
        comp_obj_para.metainfo.is_a                    = "bookindex";
        comp_obj_para.text                             = bi_tmp.to!string.strip;
        comp_obj_para.metainfo.ocn                     = 0;
        comp_obj_para.metainfo.identifier              = "";
        comp_obj_para.metainfo.object_number_off       = true;
        comp_obj_para.metainfo.object_number_type      = 0;
        comp_obj_para.tags.anchor_tags                 = bi_tmp_tags;
        comp_obj_para.attrib.indent_hang               = 0;
        comp_obj_para.attrib.indent_base               = 1;
        comp_obj_para.attrib.bullet                    = false;
        comp_obj_para.has.inline_links                 = true;
        comp_obj_para.text                             = bi_tmp.to!string.strip;
        bookindex_section                              ~= comp_obj_para;
        ++mkn;
      }
    } else {                              // no book index, (figure out what to do here)
      comp_obj_heading_                                = comp_obj_heading_.init;
      comp_obj_heading_.text                           = "(skip) there is no Book Index";
      comp_obj_heading_.metainfo.ocn                   = 0;
      comp_obj_heading_.metainfo.identifier            = "";
      comp_obj_heading_.metainfo.dummy_heading         = true;
      comp_obj_heading_.metainfo.object_number_off     = true;
      comp_obj_heading_.metainfo.object_number_type    = 0;
      comp_obj_heading_.metainfo.heading_lev_markup    = 1;
      comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
      comp_obj_heading_.metainfo.parent_ocn            = 1;
      comp_obj_heading_.metainfo.parent_lev_markup     = 0;
      bookindex_section                                ~= comp_obj_heading_;
    }
    auto t = tuple(
      bookindex_section,
      obj_cite_digits
    );
    return t;
  }
#+END_SRC

****** }

#+name: meta_emitters_book_index_report_section
#+BEGIN_SRC d
}
#+END_SRC

**** (end)notes section                                 :endnotes:section:

#+name: meta_emitters_endnotes
#+BEGIN_SRC d
struct NotesSection {
  string[string] object_notes;
  int previous_count;
  int mkn;
  static auto rgx = Rgx();
#+END_SRC

***** { gather notes for endnote section struct open

#+name: meta_emitters_endnotes
#+BEGIN_SRC d
  private auto gather_notes_for_endnote_section(
    ObjGenericComposite[] contents_am,
    string[string]        tag_in_seg,
    int                   cntr,
  ) {
    assert((contents_am[cntr].metainfo.is_a == "para")
    || (contents_am[cntr].metainfo.is_a     == "heading")
    || (contents_am[cntr].metainfo.is_a     == "quote")
    || (contents_am[cntr].metainfo.is_a     == "group")
    || (contents_am[cntr].metainfo.is_a     == "block")
    || (contents_am[cntr].metainfo.is_a     == "verse"));
    assert(cntr >= previous_count);
    assert(
      (contents_am[cntr].text).match(
      rgx.inline_notes_al_all_note)
    );
    mixin InternalMarkup;
    previous_count=cntr;
    static auto mkup = InlineMarkup();
    static auto munge = ObjInlineMarkupMunge();
    foreach(m;
      (contents_am[cntr].text).matchAll(
        rgx.inline_notes_al_special_char_note)
    ) {
      debug(endnotes_build) {
        writeln(
          "{^", mkup.ff_o, m["char"], ".", mkup.ff_c, "^}"
          ~ mkup.mark_internal_site_lnk,
          tag_in_seg["seg_lv4"],
            ".fnSuffix#noteref_\n  ", m["char"], " ",
          m["note"]); // sometimes need segment name (segmented html & epub)
      }
      // you need anchor for segments at this point ->
      object_notes["anchor"] ~= "note_" ~ m["char"] ~ "』";
      object_notes["notes"]  ~= (tag_in_seg["seg_lv4"].empty)
      ? (links_and_images(
          "{" ~ mkup.superscript  ~ mkup.ff_o ~ m["char"] ~ "." ~ mkup.ff_c  ~ mkup.superscript  ~ "}#noteref_"
          ~ m["char"]) ~ " "
          ~ m["note"] ~ "』"
        )
      : (links_and_images(
          "{" ~ mkup.superscript ~ mkup.ff_o ~ m["char"] ~ "." ~ mkup.ff_c  ~ mkup.superscript ~ "}"
           ~ mkup.mark_internal_site_lnk
           ~ tag_in_seg["seg_lv4"]
           ~ ".fnSuffix#noteref_"
           ~ m["char"]) ~ " "
           ~ m["note"] ~ "』"
        );
    }
    foreach(m;
      (contents_am[cntr].text).matchAll(
        rgx.inline_notes_al_regular_number_note)
    ) {
      debug(endnotes_build) {
        writeln(
          "{^", mkup.ff_o, m["num"], ".", mkup.ff_c, "^}"
          ~ mkup.mark_internal_site_lnk,
          tag_in_seg["seg_lv4"],
            ".fnSuffix#noteref_\n  ", m["num"], " ",
          m["note"]); // sometimes need segment name (segmented html & epub)
      }
      // you need anchor for segments at this point ->
      object_notes["anchor"] ~= "note_" ~ m["num"] ~ "』";
      object_notes["notes"]  ~= (tag_in_seg["seg_lv4"].empty)
      ? (links_and_images(
          "{" ~ mkup.superscript  ~ mkup.ff_o ~ m["num"] ~ "." ~ mkup.ff_c  ~ mkup.superscript  ~ "}#noteref_"
          ~ m["num"]) ~ " "
          ~ m["note"] ~ "』"
        )
      : (links_and_images(
          "{" ~ mkup.superscript ~ mkup.ff_o ~ m["num"] ~ "." ~ mkup.ff_c  ~ mkup.superscript ~ "}"
           ~ mkup.mark_internal_site_lnk
           ~ tag_in_seg["seg_lv4"]
           ~ ".fnSuffix#noteref_"
           ~ m["num"]) ~ " "
           ~ m["note"] ~ "』"
        );
    }
    return object_notes;
  }
#+END_SRC

****** gathered notes

#+name: meta_emitters_endnotes
#+BEGIN_SRC d
  private auto gathered_notes() {
    string[][string] endnotes_;
    if (object_notes.length > 1) {
      endnotes_["notes"] = (object_notes["notes"].split(rgx.break_string))[0..$-1];
      endnotes_["anchor"] = (object_notes["anchor"].split(rgx.break_string))[0..$-1];
    } else {
      endnotes_["notes"] = [];
      endnotes_["anchor"] = [];
    }
    return endnotes_;
  }
#+END_SRC

****** endnote objects

#+name: meta_emitters_endnotes
#+BEGIN_SRC d
  private auto endnote_objects(N,O)(
    N              obj_cite_digits,
    O              opt_action,
  ) {
    mixin DocReformNode;
    ObjGenericComposite[] the_endnotes_section;
    auto endnotes_ = gathered_notes();
    string type_is;
    string lev, lev_markup_number, lev_collapsed_number;
    string attrib;
    int[string] indent;
    ObjGenericComposite comp_obj_heading_;
    if ((endnotes_["notes"].length > 0)
    && (opt_action.backmatter && opt_action.section_endnotes)) {
      {
        comp_obj_heading_                                = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part            = "backmatter";
        comp_obj_heading_.metainfo.is_of_section         = "endnotes";
        comp_obj_heading_.metainfo.is_of_type            = "para";
        comp_obj_heading_.metainfo.is_a                  = "heading";
        comp_obj_heading_.text                           = "Endnotes";
        comp_obj_heading_.metainfo.ocn                   = 0;
        comp_obj_heading_.metainfo.identifier            = "";
        comp_obj_heading_.metainfo.dummy_heading         = false;
        comp_obj_heading_.metainfo.object_number_off     = true;
        comp_obj_heading_.metainfo.object_number_type    = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub   = "_part_endnotes";
        comp_obj_heading_.tags.anchor_tag_html           = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html           = "endnotes";
        comp_obj_heading_.tags.anchor_tags               = ["section_endnotes"];
        comp_obj_heading_.metainfo.heading_lev_markup    = 1;
        comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
        comp_obj_heading_.metainfo.parent_ocn            = 1;
        comp_obj_heading_.metainfo.parent_lev_markup     = 0;
        the_endnotes_section                             ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
        ++mkn;
      }
      {
        comp_obj_heading_                                = comp_obj_heading_.init;
        comp_obj_heading_.metainfo.is_of_part            = "backmatter";
        comp_obj_heading_.metainfo.is_of_section         = "endnotes";
        comp_obj_heading_.metainfo.is_of_type            = "para";
        comp_obj_heading_.metainfo.is_a                  = "heading";
        comp_obj_heading_.text                           = "Endnotes";
        comp_obj_heading_.metainfo.ocn                   = 0;
        comp_obj_heading_.metainfo.identifier            = "";
        comp_obj_heading_.metainfo.dummy_heading         = true;
        comp_obj_heading_.metainfo.object_number_off     = true;
        comp_obj_heading_.metainfo.object_number_type    = 0;
        comp_obj_heading_.tags.segment_anchor_tag_epub   = "endnotes";
        comp_obj_heading_.tags.anchor_tag_html           = comp_obj_heading_.tags.segment_anchor_tag_epub;
        comp_obj_heading_.tags.in_segment_html           = comp_obj_heading_.tags.anchor_tag_html;
        comp_obj_heading_.metainfo.heading_lev_markup    = 4;
        comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
        comp_obj_heading_.metainfo.parent_ocn            = 1;
        comp_obj_heading_.metainfo.parent_lev_markup     = 0;
        comp_obj_heading_.tags.anchor_tags               = ["endnotes"];
        the_endnotes_section                             ~= comp_obj_heading_;
        tag_assoc[comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = comp_obj_heading_.tags.in_segment_html;
        tag_assoc[comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = comp_obj_heading_.tags.segment_anchor_tag_epub;
        ++mkn;
      }
    } else {
      comp_obj_heading_                                = comp_obj_heading_.init;
      comp_obj_heading_.metainfo.is_of_part            = "empty";
      comp_obj_heading_.metainfo.is_of_section         = "empty";
      comp_obj_heading_.metainfo.is_of_type            = "para";
      comp_obj_heading_.metainfo.is_a                  = "heading";
      comp_obj_heading_.text                           = "(skip) there are no Endnotes";
      comp_obj_heading_.metainfo.ocn                   = 0;
      comp_obj_heading_.metainfo.identifier            = "";
      comp_obj_heading_.metainfo.dummy_heading         = true;
      comp_obj_heading_.metainfo.object_number_off     = true;
      comp_obj_heading_.metainfo.object_number_type    = 0;
      comp_obj_heading_.metainfo.heading_lev_markup    = 1;
      comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
      comp_obj_heading_.metainfo.parent_ocn            = 1;
      comp_obj_heading_.metainfo.parent_lev_markup     = 0;
      the_endnotes_section                             ~= comp_obj_heading_;
    }
    if (opt_action.backmatter && opt_action.section_endnotes) {
      ObjGenericComposite comp_obj_endnote_;
      comp_obj_endnote_                                = comp_obj_endnote_.init;
      comp_obj_endnote_.metainfo.is_of_part            = "backmatter";
      comp_obj_endnote_.metainfo.is_of_section         = "endnote";
      comp_obj_endnote_.metainfo.is_of_type            = "para";
      comp_obj_endnote_.metainfo.is_a                  = "endnote";
      comp_obj_endnote_.metainfo.ocn                   = 0;
      comp_obj_endnote_.metainfo.identifier            = "";
      // comp_obj_heading_.metainfo.dummy_heading         = false;
      comp_obj_heading_.metainfo.object_number_off     = true; // check
      comp_obj_heading_.metainfo.object_number_type    = 0; // check
      comp_obj_endnote_.attrib.indent_hang             = 0;
      comp_obj_endnote_.attrib.indent_base             = 0;
      comp_obj_endnote_.attrib.bullet                  = false;
      foreach (i, endnote; endnotes_["notes"]) {
        auto     m                                     = endnote.matchFirst(rgx.note_ref);
        string   notenumber                            = m["ref"].to!string;
        string   anchor_tag                            = "note_" ~ notenumber;
        comp_obj_endnote_.tags.anchor_tags             = [ endnotes_["anchor"][i] ];
        comp_obj_endnote_.has.inline_links             = true;
        comp_obj_endnote_.text                         = endnote.inline_markup_faces.strip;
        the_endnotes_section                           ~= comp_obj_endnote_;
      }
    }
    auto t = tuple(the_endnotes_section, obj_cite_digits);
    return t;
  }
#+END_SRC

***** }

#+name: meta_emitters_endnotes
#+BEGIN_SRC d
}
#+END_SRC

**** bibliography                                           :bibliography:
***** { biblio struct

#+name: meta_emitters_bibliography
#+BEGIN_SRC d
struct Bibliography {
#+END_SRC

****** biblio

#+name: meta_emitters_bibliography
#+BEGIN_SRC d
  public JSONValue[] flow_bibliography_()(
    return ref string[]    biblio_unsorted_incomplete,
    return ref JSONValue[] bib_arr_json
  ) {
    JSONValue[] biblio_unsorted
      = biblio_make_unsorted_array_of_json_objects(biblio_unsorted_incomplete, bib_arr_json); // TODO lookat returns
    biblio_arr_json = [];
    biblio_unsorted_incomplete = [];
    JSONValue[] biblio_sorted__ = biblio_sort(biblio_unsorted);
    debug(biblio0) {
      biblio_debug(biblio_sorted__);
      writeln("---");
      writeln("unsorted incomplete: ", biblio_unsorted_incomplete.length);
      writeln("json:                ", bib_arr_json.length);
      writeln("unsorted:            ", biblio_unsorted.length);
      writeln("sorted:              ", biblio_sorted__.length);
      int cntr;
      int[7] x;
      while (cntr < x.length) {
        writeln(cntr, ": ", biblio_sorted__[cntr]["fulltitle"]);
        cntr++;
      }
    }
    return biblio_sorted__;
  }
#+END_SRC

****** biblio unsorted complete

#+name: meta_emitters_bibliography
#+BEGIN_SRC d
  final private JSONValue[] biblio_make_unsorted_array_of_json_objects()(
    string[]      biblio_unordered,
    JSONValue[]   bib_arr_json
  ) {
    foreach (bibent; biblio_unordered) {
      /+ update bib to include deemed_author, needed for:
        sort_bibliography_array_by_deemed_author_year_title
        either: sort on multiple fields, or; create such sort field
      +/
      JSONValue j = parseJSON(bibent);
      if (!empty(j["fulltitle"].str)) {
        if (!empty(j["author_raw"].str)) {
          j["deemed_author"]=j["author_arr"][0];
        } else if (!empty(j["editor_raw"].str)) {
          j["deemed_author"]=j["editor_arr"][0];
        }
        j["sortby_deemed_author_year_title"] = (
          j["deemed_author"].str ~
           "; " ~
           j["year"].str ~
           "; "  ~
           j["fulltitle"].str
        );
      }
      bib_arr_json ~= j;
    }
    return bib_arr_json.dup;
  }
#+END_SRC

****** biblio sort

#+name: meta_emitters_bibliography
#+BEGIN_SRC d
  final private JSONValue[] biblio_sort()(JSONValue[] biblio_unordered) {
    JSONValue[] biblio_sorted_;
    biblio_sorted_
      = sort!((a, b){
        return ((a["sortby_deemed_author_year_title"].str) < (b["sortby_deemed_author_year_title"].str));
      })(biblio_unordered).array;
    debug(bibliosorted) {
      foreach (j; biblio_sorted_) {
        if (!empty(j["fulltitle"].str)) {
          writeln(j["sortby_deemed_author_year_title"]);
        }
      }
    }
    return biblio_sorted_;
  }
#+END_SRC

****** biblio debug

#+name: meta_emitters_bibliography
#+BEGIN_SRC d
  void biblio_debug()(JSONValue[] biblio_sorted) {
    debug(biblio0) {
      foreach (j; biblio_sorted) {
        if (!empty(j["fulltitle"].str)) {
          writeln(j["sortby_deemed_author_year_title"]);
        }
      }
    }
  }
#+END_SRC

***** }

#+name: meta_emitters_bibliography
#+BEGIN_SRC d
}
#+END_SRC

**** node structure metadata                     :structure:metadata:node:
***** { metadata node struct

#+name: meta_emitters_metadata
#+BEGIN_SRC d
struct NodeStructureMetadata {
  int lv, lv0, lv1, lv2, lv3, lv4, lv5, lv6, lv7;
  int obj_cite_digit;
  int[string] p_; // p_ parent_
  static auto rgx = Rgx();
#+END_SRC

****** node metadata emitter

#+name: meta_emitters_metadata
#+BEGIN_SRC d
  ObjGenericComposite node_location_emitter(La,Ta,N)(
    string         lev_markup_number,
    string[string] tag_in_seg,
    La             lev_anchor_tag,
    Ta             tag_assoc,
    N              obj_cite_digits,
    int            cntr_,
    int            ptr_,
    string         is_
  ) {
    debug(asserts) {
      static assert(is(typeof(obj_cite_digits.object_number) == int));
    }
    assert(is_ != "heading");
    assert(obj_cite_digits.object_number.to!int >= 0);
    assert(is_ != "heading");                          // should not be necessary
    assert(obj_cite_digits.object_number.to!int >= 0); // should not be necessary
    if (lv7 > State.off) {
      p_["lev_markup_number"] = DocStructMarkupHeading.h_text_4;
      p_["object_number"] = lv7;
    } else if (lv6 > State.off) {
      p_["lev_markup_number"] = DocStructMarkupHeading.h_text_3;
      p_["object_number"] = lv6;
    } else if (lv5 > State.off) {
      p_["lev_markup_number"] = DocStructMarkupHeading.h_text_2;
      p_["object_number"] = lv5;
    } else {
      p_["lev_markup_number"] = DocStructMarkupHeading.h_text_1;
      p_["object_number"] = lv4;
    }
    ObjGenericComposite comp_obj_location;
    comp_obj_location                              = comp_obj_location.init;
    comp_obj_location.metainfo.is_a                = is_;
    comp_obj_location.metainfo.ocn                 = obj_cite_digits.object_number;
    comp_obj_location.metainfo.identifier          = obj_cite_digits.identifier;
    comp_obj_location.tags.anchor_tag_html         = tag_in_seg["seg_lv4"];
    comp_obj_location.tags.segment_anchor_tag_epub = tag_in_seg["seg_lv1_to_4"];
    comp_obj_location.tags.heading_lev_anchor_tag  = lev_anchor_tag;
    comp_obj_location.metainfo.parent_ocn          = p_["object_number"];
    comp_obj_location.metainfo.parent_lev_markup   = p_["lev_markup_number"];
    debug(_node) {
      if (lev_markup_number.match(rgx.levels_numbered_headings)) {
        writeln("x ", _node.to!string);
      } else {
        writeln("- ", _node.to!string);
      }
    }
    assert(comp_obj_location.metainfo.parent_lev_markup >= 4);
    assert(comp_obj_location.metainfo.parent_lev_markup <= 7);
    assert(comp_obj_location.metainfo.parent_ocn >= 0);
    return comp_obj_location;
  }
  invariant() {
  }
#+END_SRC

****** node metadata emitter heading, (including most segnames & their pointers)

#+name: meta_emitters_metadata
#+BEGIN_SRC d
  ObjGenericComposite node_emitter_heading(Hd,TaL,TA,N,fNr,fNs,fL)(
    string         _text,
    string         lev_markup_number,
    string         lev_collapsed_number,
    Hd             dummy_heading_status,
    string[string] tag_in_seg,
    TaL            lev_anchor_tag,
    TA             tag_assoc,
    N              obj_cite_digits,
    int            cntr_,
    int            ptr_,
    string[]       lv_ancestors_txt,
    string         is_,
    int            html_segnames_ptr,
    fNr            flag_notes_reg,
    fNs            flag_notes_star,
    fL             flag_links,
  ) {
    debug(asserts) {
      static assert(is(typeof(lev)                                       == string));
      static assert(is(typeof(obj_cite_digits.object_number)             == int));
    }
    assert(is_ == "heading");
    assert((obj_cite_digits.object_number).to!int >= 0);
    assert(
      lev_markup_number.match(rgx.levels_numbered),
      ("not a valid heading level: " ~ lev_markup_number ~ " at " ~ obj_cite_digits.object_number.to!string)
    );
    if (lev_markup_number.match(rgx.levels_numbered)) {
      if (lev_markup_number.to!int == 0) {
        /+ TODO first hit (of two) with this assertion failure, check, fix & reinstate
        assert(obj_cite_digits.object_number.to!int == 1,
          "ERROR header lev markup number is: " ~
          lev_markup_number.to!string ~
          " obj_cite_digits.object_number.to!int should == 1 but is: " ~
           obj_cite_digits.object_number.to!string ~
          "\n" ~ _text);
        +/
      }
    }
    switch (lev_markup_number.to!int) {
    case 0:
      lv = DocStructMarkupHeading.h_sect_A;
      lv0 = obj_cite_digit;
      lv1=0; lv2=0; lv3=0; lv4=0; lv5=0; lv6=0; lv7=0;
      p_["lev_markup_number"] = 0;
      p_["object_number"] = 0;
      break;
    case 1:
      lv = DocStructMarkupHeading.h_sect_B;
      lv1 = obj_cite_digit;
      lv2=0; lv3=0; lv4=0; lv5=0; lv6=0; lv7=0;
      p_["lev_markup_number"]
        = DocStructMarkupHeading.h_sect_A;
      p_["object_number"] = lv0;
      break;
    case 2:
      lv = DocStructMarkupHeading.h_sect_C;
      lv2 = obj_cite_digit;
      lv3=0; lv4=0; lv5=0; lv6=0; lv7=0;
      p_["lev_markup_number"]
        = DocStructMarkupHeading.h_sect_B;
      p_["object_number"] = lv1;
      break;
    case 3:
      lv = DocStructMarkupHeading.h_sect_D;
      lv3=obj_cite_digit;
      lv4=0; lv5=0; lv6=0; lv7=0;
      p_["lev_markup_number"]
        = DocStructMarkupHeading.h_sect_C;
      p_["object_number"] = lv2;
      break;
    case 4:
      lv = DocStructMarkupHeading.h_text_1;
      lv4 = obj_cite_digit;
      lv5=0; lv6=0; lv7=0;
      if (lv3 > State.off) {
        p_["lev_markup_number"]
          = DocStructMarkupHeading.h_sect_D;
        p_["object_number"] = lv3;
      } else if (lv2 > State.off) {
        p_["lev_markup_number"]
          = DocStructMarkupHeading.h_sect_C;
        p_["object_number"] = lv2;
      } else if (lv1 > State.off) {
        p_["lev_markup_number"]
          = DocStructMarkupHeading.h_sect_B;
        p_["object_number"] = lv1;
      } else {
        p_["lev_markup_number"]
          = DocStructMarkupHeading.h_sect_A;
        p_["object_number"] = lv0;
      }
      break;
    case 5:
      lv = DocStructMarkupHeading.h_text_2;
      lv5 = obj_cite_digit;
      lv6=0; lv7=0;
      p_["lev_markup_number"]
        = DocStructMarkupHeading.h_text_1;
      p_["object_number"] = lv4;
      break;
    case 6:
      lv = DocStructMarkupHeading.h_text_3;
      lv6 = obj_cite_digit;
      lv7=0;
      p_["lev_markup_number"]
        = DocStructMarkupHeading.h_text_2;
      p_["object_number"] = lv5;
      break;
    case 7:
      lv = DocStructMarkupHeading.h_text_4;
      lv7 = obj_cite_digit;
      p_["lev_markup_number"]
        = DocStructMarkupHeading.h_text_3;
      p_["object_number"] = lv6;
      break;
    default:
      break;
    }
    ObjGenericComposite _comp_obj_heading_;
    _comp_obj_heading_                                  = _comp_obj_heading_.init;
    _comp_obj_heading_.metainfo.is_of_part              = "body";
    _comp_obj_heading_.metainfo.is_of_section           = "body";
    _comp_obj_heading_.metainfo.is_of_type              = "para";
    _comp_obj_heading_.metainfo.is_a                    = "heading";
    _comp_obj_heading_.text                             = _text.to!string.strip;
    _comp_obj_heading_.metainfo.ocn                     = obj_cite_digits.object_number;
    _comp_obj_heading_.metainfo.identifier              = obj_cite_digits.identifier;
    _comp_obj_heading_.metainfo.dummy_heading           = (dummy_heading_status == "t") ? true: false;
    _comp_obj_heading_.metainfo.object_number_off       = obj_cite_digits.off;
    // _comp_obj_heading_.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
    _comp_obj_heading_.metainfo.object_number_type      = obj_cite_digits.type;
    _comp_obj_heading_.tags.segment_anchor_tag_epub     = tag_in_seg["seg_lv1_to_4"];
    _comp_obj_heading_.tags.anchor_tag_html             = tag_in_seg["seg_lv4"];
    _comp_obj_heading_.tags.in_segment_html             = _comp_obj_heading_.tags.anchor_tag_html;
    _comp_obj_heading_.tags.heading_lev_anchor_tag      = lev_anchor_tag;
    _comp_obj_heading_.tags.html_segment_anchor_tag_is  = tag_in_seg["seg_lv4"];
    _comp_obj_heading_.tags.epub_segment_anchor_tag_is  = tag_in_seg["seg_lv1_to_4"];
    _comp_obj_heading_.metainfo.heading_lev_markup      = (!(lev_markup_number.empty) ? lev_markup_number.to!int : 0);
    _comp_obj_heading_.metainfo.heading_lev_collapsed   = (!(lev_collapsed_number.empty) ? lev_collapsed_number.to!int : 0);
    _comp_obj_heading_.metainfo.parent_ocn              = p_["object_number"];
    _comp_obj_heading_.metainfo.parent_lev_markup       = p_["lev_markup_number"];
    _comp_obj_heading_.tags.heading_ancestors_text      = lv_ancestors_txt;
    _comp_obj_heading_.ptr.doc_object                   = cntr_;
    _comp_obj_heading_.ptr.html_segnames                = ((lev_markup_number == "4") ? html_segnames_ptr : 0);
    _comp_obj_heading_.ptr.heading                      = ptr_;
    _comp_obj_heading_.has.inline_notes_reg             = flag_notes_reg;
    _comp_obj_heading_.has.inline_notes_star            = flag_notes_star;
    _comp_obj_heading_.has.inline_links                 = flag_links;
    tag_assoc[_comp_obj_heading_.tags.anchor_tag_html]["seg_lv4"]              = _comp_obj_heading_.tags.in_segment_html;
    tag_assoc[_comp_obj_heading_.tags.segment_anchor_tag_epub]["seg_lv1_to_4"] = _comp_obj_heading_.tags.segment_anchor_tag_epub;
    debug(_node) {
      if (lev_markup_number.match(rgx.levels_numbered_headings)) {
        writeln("* ", _node.to!string);
      }
    }
    debug(nodeheading) {
      if (lev_markup_number.match(rgx.levels_numbered_headings)) {
        writeln("* ", _node.to!string);
      }
    }
    assert(_comp_obj_heading_.metainfo.parent_lev_markup <= 7);
    assert(_comp_obj_heading_.metainfo.parent_ocn >= 0);
    if (lev_markup_number.match(rgx.levels_numbered_headings)) {
      assert(_comp_obj_heading_.metainfo.heading_lev_markup <= 7);
      assert(_comp_obj_heading_.metainfo.ocn >= 0);
      if (_comp_obj_heading_.metainfo.parent_lev_markup > 0) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup < _comp_obj_heading_.metainfo.heading_lev_markup);
        if (_comp_obj_heading_.metainfo.ocn != 0) {
          assert(_comp_obj_heading_.metainfo.parent_ocn < _comp_obj_heading_.metainfo.ocn);
        }
      }
      if (_comp_obj_heading_.metainfo.heading_lev_markup == 0) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_A);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_sect_B) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_A);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_sect_C) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_B);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_sect_D) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_C);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_1) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup <= DocStructMarkupHeading.h_sect_D);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_2) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_text_1);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_3) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_text_2);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_4) {
        assert(_comp_obj_heading_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_text_3);
      } else if  (_comp_obj_heading_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_5) {
      }
    }
    return _comp_obj_heading_;
  }
  invariant() {
  }
#+END_SRC

***** }

#+name: meta_emitters_metadata
#+BEGIN_SRC d
}
#+END_SRC

*** function assertions                                        :assertions:
**** assertions on markup document structure               :doc_structure:

#+name: abs_functions_assertions
#+BEGIN_SRC d
pure void assertions_doc_structure()(
  string[string]  an_object,
  int[string]     lv
) {
  if (lv["h3"] > State.off) {
    assert(lv["h0"] > State.off);
    assert(lv["h1"] > State.off);
    assert(lv["h2"] > State.off);
  } else if (lv["h2"] > State.off) {
    assert(lv["h0"] > State.off);
    assert(lv["h1"] > State.off);
    assert(lv["h3"] == State.off);
  } else if (lv["h1"] > State.off) {
    assert(lv["h0"] > State.off);
    assert(lv["h2"] == State.off);
    assert(lv["h3"] == State.off);
  } else if (lv["h0"] > State.off) {
    assert(lv["h1"] == State.off);
    assert(lv["h2"] == State.off);
    assert(lv["h3"] == State.off);
  } else {
    assert(lv["h0"] == State.off);
    assert(lv["h1"] == State.off);
    assert(lv["h2"] == State.off);
    assert(lv["h3"] == State.off);
  }
  if (lv["h7"] > State.off) {
    assert(lv["h4"] > State.off);
    assert(lv["h5"] > State.off);
    assert(lv["h6"] > State.off);
  } else if (lv["h6"] > State.off) {
    assert(lv["h4"] > State.off);
    assert(lv["h5"] > State.off);
    assert(lv["h7"] == State.off);
  } else if (lv["h5"] > State.off) {
    assert(lv["h4"] > State.off);
    assert(lv["h6"] == State.off);
    assert(lv["h7"] == State.off);
  } else if (lv["h4"] > State.off) {
    assert(lv["h5"] == State.off);
    assert(lv["h6"] == State.off);
    assert(lv["h7"] == State.off);
  } else {
    assert(lv["h4"] == State.off);
    assert(lv["h5"] == State.off);
    assert(lv["h6"] == State.off);
    assert(lv["h7"] == State.off);
  }
  if (lv["h0"] == State.off) {
    assert(lv["h1"] == State.off);
    assert(lv["h2"] == State.off);
    assert(lv["h3"] == State.off);
    assert(lv["h4"] == State.off);
    assert(lv["h5"] == State.off);
    assert(lv["h6"] == State.off);
    assert(lv["h7"] == State.off);
  }
  if (lv["h1"] == State.off) {
    assert(lv["h2"] == State.off);
    assert(lv["h3"] == State.off);
  }
  if (lv["h2"] == State.off) {
    assert(lv["h3"] == State.off);
  }
  if (lv["h3"] == State.off) {
  }
  if (lv["h4"] == State.off) {
    assert(lv["h5"] == State.off);
    assert(lv["h6"] == State.off);
    assert(lv["h7"] == State.off);
  }
  if (lv["h5"] == State.off) {
    assert(lv["h6"] == State.off);
    assert(lv["h7"] == State.off);
  }
  if (lv["h6"] == State.off) {
    assert(lv["h7"] == State.off);
  }
  if (lv["h7"] == State.off) {
  }
  switch ((an_object["lev"]).to!string) {
  case "A":
    if (lv["h0"] == State.off) {
      assert(lv["h1"] == State.off);
      assert(lv["h2"] == State.off);
      assert(lv["h3"] == State.off);
      assert(lv["h4"] == State.off);
      assert(lv["h5"] == State.off);
      assert(lv["h6"] == State.off);
      assert(lv["h7"] == State.off);
    } else {                       // (lv["h0"] > State.off)
      assert(lv["h0"] == State.off,"error should not enter level A a second time");
    }
    break;
  case "B":
    if (lv["h1"] == State.off) {
      assert(lv["h0"] > State.off);
      assert(lv["h2"] == State.off);
      assert(lv["h3"] == State.off);
    } else {                       // (lv["h1"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h1"] > State.off);
    }
    break;
  case "C":
    if (lv["h2"] == State.off) {
      assert(lv["h0"] > State.off);
      assert(lv["h1"] > State.off);
      assert(lv["h3"] == State.off);
    } else {                       // (lv["h2"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h1"] > State.off);
      assert(lv["h2"] > State.off);
    }
    break;
  case "D":
    if (lv["h3"] == State.off) {
      assert(lv["h0"] > State.off);
      assert(lv["h1"] > State.off);
      assert(lv["h2"] > State.off);
    } else {                      // (lv["h3"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h1"] > State.off);
      assert(lv["h2"] > State.off);
      assert(lv["h3"] > State.off);
    }
    break;
  case "1":
    if (lv["h4"] == State.off) {
      assert(lv["h0"] > State.off);
    } else {                      // (lv["h4"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
    }
    break;
  case "2":
    if (lv["h5"] == State.off) {
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
    } else {                      // (lv["h5"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
      assert(lv["h5"] > State.off);
    }
    break;
  case "3":
    if (lv["h6"] == State.off) {
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
      assert(lv["h5"] > State.off);
    } else {                      // (lv["h6"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
      assert(lv["h5"] > State.off);
      assert(lv["h6"] > State.off);
    }
    break;
  case "4":
    if (lv["h7"] == State.off) {
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
      assert(lv["h5"] > State.off);
      assert(lv["h6"] > State.off);
    } else {                      // (lv["h7"] > State.off)
      assert(lv["h0"] > State.off);
      assert(lv["h4"] > State.off);
      assert(lv["h5"] > State.off);
      assert(lv["h6"] > State.off);
      assert(lv["h7"] > State.off);
    }
    break;
  default:
    break;
  }
}
#+END_SRC

**** assertions on blocks                                         :blocks:

#+name: abs_functions_assertions
#+BEGIN_SRC d
pure void assertions_flag_types_block_status_none_or_closed()(int[string] obj_type_status) {
  assert(
    (obj_type_status["code"] == TriState.off)
    || (obj_type_status["code"] == TriState.closing),
    "code block status: off or closing");
  assert(
    (obj_type_status["poem"] == TriState.off)
    || (obj_type_status["poem"] == TriState.closing),
    "poem status: off or closing");
  assert(
    (obj_type_status["table"] == TriState.off)
    || (obj_type_status["table"] == TriState.closing),
    "table status: off or closing");
  assert(
    (obj_type_status["group"] == TriState.off)
    || (obj_type_status["group"] == TriState.closing),
    "group block status: off or closing");
  assert(
    (obj_type_status["block"] == TriState.off)
    || (obj_type_status["block"] == TriState.closing),
    "block status: off or closing");
}
#+END_SRC

*** doc sect keys seq

#+name: template_doc_sect_keys_seq
#+BEGIN_SRC d
template docSectKeysSeq() {
  auto docSectKeysSeq(string[][string] document_section_keys_sequenced) {
    struct doc_sect_keys_seq {
      string[] scroll() {
        return document_section_keys_sequenced["scroll"];
      }
      string[] seg() {
        return document_section_keys_sequenced["seg"];
      }
      string[] sql() {
        return document_section_keys_sequenced["sql"];
      }
      string[] latex() {
        return document_section_keys_sequenced["latex"];
      }
    }
    return doc_sect_keys_seq();
  }
}
#+END_SRC

* 2. Object Setter (Set Abstract Object) :module:spine:meta_object_setter:

set abstracted objects for downstream processing

** _module template_

#+BEGIN_SRC d :tangle "../src/doc_reform/meta/object_setter.d"
/++
  object setter:
  setting of sisu objects for downstream processing
  meta_object_setter.d
+/
module doc_reform.meta.object_setter;
template ObjectSetter() {
  /+ structs +/
  <<meta_structs_init>>
}
#+END_SRC

** 1. initialize structs                                            :struct:
*** heading attribute

#+BEGIN_SRC d
struct HeadingAttrib {
  string lev                            = "9";
  int    heading_lev_markup             = 9;
  int    heading_lev_collapsed          = 9;
  int[]  closes_lev_collapsed           = [];
  int[]  closes_lev_markup              = [];
  int    array_ptr                      = 0;
  int    heading_array_ptr_segments     = 0;
}
#+END_SRC

*** _composite object_ [#A]

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_MetaInfo_ {
  string                 is_of_part                         = ""; // frontmatter, body, backmatter
  string                 is_of_section                      = ""; // toc, body, glossary, biography, book index, blurb
  string                 is_of_type                         = ""; // para, block ?
  string                 is_a                               = ""; // heading, para, table, code block, group, verse/poem ...
  alias                  of_part                            = is_of_part;
  alias                  of_section                         = is_of_section;
  alias                  is_of                              = is_of_type;
  string                 attrib                             = "";
  string                 lang                               = ""; // blocks: group, block, quote; not codeblock;
  string                 syntax                             = ""; // codeblock only
  /+ o_n +/
  int                    o_n_substantive                    = 0;
  int                    o_n_non_substantive                = 0;
  int                    o_n_glossary                       = 0;
  int                    o_n_bibliography                   = 0;
  int                    o_n_book_index                     = 0;
  int                    o_n_blurb                          = 0;
  string object_number_substantive() const @property {
    return (o_n_substantive==0) ? "" : o_n_substantive.to!string;
  }
  string object_number_non_substantive() const @property {
    return (o_n_non_substantive==0) ? "" : o_n_non_substantive.to!string;
  }
  string object_number_glossary() const @property {
    return (o_n_glossary==0) ? "" : o_n_glossary.to!string;
  }
  string object_number_bibliography() const @property {
    return (o_n_bibliography==0) ? "" : o_n_bibliography.to!string;
  }
  string object_number_book_index() const @property {
    return (o_n_book_index==0) ? "" : o_n_book_index.to!string;
  }
  string object_number_blurb() const @property {
    return (o_n_blurb==0) ? "" : o_n_blurb.to!string;
  }
  bool                   object_number_off                  = false;
  bool                   visible_object_number              = false;
  int                    object_number_type                 = 0; // { ocn, non, bkidx }
  /+ node +/
  string[string][string] node;
  int                    ocn                                = 0;
  string                 identifier                         = "";
  string object_number() const @property {
    return (ocn==0) ? "" : ocn.to!string;
  }
  int                    o_n_type                           = 0;
  int                    heading_lev_markup                 = 9;
  int                    heading_lev_collapsed              = 9;
  string marked_up_level() const @property {
    string _out;
    switch (heading_lev_markup) {
    case 0  : _out = "A"; break;
    case 1  : _out = "B"; break;
    case 2  : _out = "C"; break;
    case 3  : _out = "D"; break;
    case 4  : _out = "1"; break;
    case 5  : _out = "2"; break;
    case 6  : _out = "3"; break;
    case 7  : _out = "4"; break;
    default : _out = "";  break; // "9";
    }
    return _out;
  }
  bool                   dummy_heading                       = false;
  int[]                  markedup_ancestors                  = [ 0, 0, 0, 0, 0, 0, 0, 0,];
  int[]                  collapsed_ancestors                 = [ 0, 0, 0, 0, 0, 0, 0, 0,];
  int[]                  dom_structure_markedup_tags_status  = [ 0, 0, 0, 0, 0, 0, 0, 0,];
  int[]                  dom_structure_collapsed_tags_status = [ 0, 0, 0, 0, 0, 0, 0, 0,];
  int                    parent_lev_markup                   = 0;
  int                    parent_ocn                          = 0;
  int                    last_decendant_ocn                  = 0;
}
#+END_SRC

**** object text attributes

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_TxtAttrib_ {
  int                    indent_base                         = 0;
  int                    indent_hang                         = 0;
  bool                   bullet                              = false;
  string                 language                            = "";
}
#+END_SRC

**** object has within it

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_Has_ {
  bool                   inline_links                        = false;
  bool                   inline_notes_reg                    = false;
  bool                   inline_notes_star                   = false;
  bool                   images                              = false;
  bool                   image_without_dimensions            = false;
}
#+END_SRC

**** table attributes

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_Table_ {
  int                    number_of_columns                   = 0;
  double[]               column_widths                       = [];
  string[]               column_aligns                       = [];
  bool                   heading                             = false;
  bool                   walls                               = false;
}
#+END_SRC

**** code attributes

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_CodeBlock_ {
  string                 syntax                              = "";
  bool                   linenumbers                         = false;
}
#+END_SRC

**** stow (things to be protected from regular text transformations, so far links)

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_Stow_ {
  string[]               link                               = [];
}
#+END_SRC

**** pointers

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_Pointer_ {
  int                    doc_object                          = 0;
  int                    html_segnames                       = 0;
  int                    heading                             = 0;
}
#+END_SRC

**** tags

#+name: meta_structs_init
#+BEGIN_SRC d
struct DocObj_Tags_ {
  string[]               heading_ancestors_text              = [ "", "", "", "", "", "", "", "", ];
  string                 anchor_tag_html                     = "";
  string                 in_segment_html                     = "";
  string                 segment_anchor_tag_epub             = "";
  string                 html_segment_anchor_tag_is          = "";
  string                 epub_segment_anchor_tag_is          = "";
  string                 heading_lev_anchor_tag              = "";
  string                 segname_prev                        = "";
  string                 segname_next                        = "";
  string[]               lev4_subtoc                         = [];
  string[]               anchor_tags                         = [];
}
#+END_SRC

**** composite object the parts

#+name: meta_structs_init
#+BEGIN_SRC d
struct ObjGenericComposite {
  string                 text                                = "";
  DocObj_MetaInfo_       metainfo;
  DocObj_TxtAttrib_      attrib;
  DocObj_Tags_           tags;
  DocObj_Has_            has;
  DocObj_Table_          table;
  DocObj_CodeBlock_      code_block;
  DocObj_Stow_           stow;
  DocObj_Pointer_        ptr;
}
#+END_SRC

*** The Objects: generic composite object array

#+name: meta_structs_init
#+BEGIN_SRC d
struct TheObjects {
  ObjGenericComposite[] oca;
}
#+END_SRC

* __END__