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diff --git a/src/ext_depends/D-YAML/source/dyaml/test/emitter.d b/src/ext_depends/D-YAML/source/dyaml/test/emitter.d
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+
+//          Copyright Ferdinand Majerech 2011-2014.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+
+module dyaml.test.emitter;
+
+@safe unittest
+{
+    import std.array : Appender;
+    import std.range : ElementType, isInputRange;
+
+    import dyaml : CollectionStyle, LineBreak, Loader, Mark, ScalarStyle;
+    import dyaml.emitter : Emitter;
+    import dyaml.event : Event, EventID, mappingStartEvent, scalarEvent, sequenceStartEvent;
+    import dyaml.test.common : assertEventsEqual, run;
+
+    // Try to emit an event range.
+    static void emitTestCommon(T)(ref Appender!string emitStream, T events, bool canonical = false) @safe
+        if (isInputRange!T && is(ElementType!T == Event))
+    {
+        auto emitter = Emitter!(typeof(emitStream), char)(emitStream, canonical, 2, 80, LineBreak.unix);
+        foreach (ref event; events)
+        {
+            emitter.emit(event);
+        }
+    }
+    /**
+    Test emitter by getting events from parsing a file, emitting them, parsing
+    the emitted result and comparing events from parsing the emitted result with
+    originally parsed events.
+
+    Params:
+        dataFilename = YAML file to parse.
+        canonicalFilename = Canonical YAML file used as dummy to determine
+            which data files to load.
+    */
+    static void testEmitterOnData(string dataFilename, string canonicalFilename) @safe
+    {
+        //Must exist due to Anchor, Tags reference counts.
+        auto loader = Loader.fromFile(dataFilename);
+        auto events = loader.parse();
+        auto emitStream = Appender!string();
+        emitTestCommon(emitStream, events);
+
+        auto loader2 = Loader.fromString(emitStream.data);
+        loader2.name = "TEST";
+        auto newEvents = loader2.parse();
+        assertEventsEqual(events, newEvents);
+    }
+    /**
+    Test emitter by getting events from parsing a canonical YAML file, emitting
+    them both in canonical and normal format, parsing the emitted results and
+    comparing events from parsing the emitted result with originally parsed events.
+
+    Params:  canonicalFilename = Canonical YAML file to parse.
+    */
+    static void testEmitterOnCanonical(string canonicalFilename) @safe
+    {
+        //Must exist due to Anchor, Tags reference counts.
+        auto loader = Loader.fromFile(canonicalFilename);
+        auto events = loader.parse();
+        foreach (canonical; [false, true])
+        {
+            auto emitStream = Appender!string();
+            emitTestCommon(emitStream, events, canonical);
+
+            auto loader2 = Loader.fromString(emitStream.data);
+            loader2.name = "TEST";
+            auto newEvents = loader2.parse();
+            assertEventsEqual(events, newEvents);
+        }
+    }
+    /**
+    Test emitter by getting events from parsing a file, emitting them with all
+    possible scalar and collection styles, parsing the emitted results and
+    comparing events from parsing the emitted result with originally parsed events.
+
+    Params:
+        dataFilename = YAML file to parse.
+        canonicalFilename = Canonical YAML file used as dummy to determine
+            which data files to load.
+    */
+    static void testEmitterStyles(string dataFilename, string canonicalFilename) @safe
+    {
+        foreach (filename; [dataFilename, canonicalFilename])
+        {
+            //must exist due to Anchor, Tags reference counts
+            auto loader = Loader.fromFile(canonicalFilename);
+            auto events = loader.parse();
+            foreach (flowStyle; [CollectionStyle.block, CollectionStyle.flow])
+            {
+                foreach (style; [ScalarStyle.literal, ScalarStyle.folded,
+                                ScalarStyle.doubleQuoted, ScalarStyle.singleQuoted,
+                                ScalarStyle.plain])
+                {
+                    Event[] styledEvents;
+                    foreach (event; events)
+                    {
+                        if (event.id == EventID.scalar)
+                        {
+                            event = scalarEvent(Mark(), Mark(), event.anchor, event.tag,
+                                                event.implicit,
+                                                event.value, style);
+                        }
+                        else if (event.id == EventID.sequenceStart)
+                        {
+                            event = sequenceStartEvent(Mark(), Mark(), event.anchor,
+                                                       event.tag, event.implicit, flowStyle);
+                        }
+                        else if (event.id == EventID.mappingStart)
+                        {
+                            event = mappingStartEvent(Mark(), Mark(), event.anchor,
+                                                      event.tag, event.implicit, flowStyle);
+                        }
+                        styledEvents ~= event;
+                    }
+                    auto emitStream = Appender!string();
+                    emitTestCommon(emitStream, styledEvents);
+                    auto loader2 = Loader.fromString(emitStream.data);
+                    loader2.name = "TEST";
+                    auto newEvents = loader2.parse();
+                    assertEventsEqual(events, newEvents);
+                }
+            }
+        }
+    }
+    run(&testEmitterOnData, ["data", "canonical"]);
+    run(&testEmitterOnCanonical, ["canonical"]);
+    run(&testEmitterStyles, ["data", "canonical"]);
+}