Reader was reimplemented.

After experiments with loading the whole file at once, and
with decoding and parsing in separate thread, lazy reader
turned to be the fastest/least memory intensive solution.
Characters are now decoded in small batches.
This improved parsing speed by ~20%.

No global state anymore. Anchors are now zero terminated strings
and TagDirectives are a simple array. Event structure was changed
to prevent size increase.
Minor fixes and improvements.

test/src/compare.d

@@ -42,8 +42,8 @@ void testParser(bool verbose, string dataFilename, string canonicalFilename)
  */
 void testLoader(bool verbose, string dataFilename, string canonicalFilename)
 {
-    auto data = Loader(dataFilename).loadAll;
-    auto canonical = Loader(canonicalFilename).loadAll;
+    auto data = Loader(dataFilename).loadAll();
+    auto canonical = Loader(canonicalFilename).loadAll();
 
     assert(data.length == canonical.length, "Unequal node count");
     foreach(n; 0 .. data.length)
@@ -58,7 +58,7 @@ void testLoader(bool verbose, string dataFilename, string canonicalFilename)
                 writeln("Canonical value:");
                 writeln(canonical[n].debugString);
             }
-            assert(false);
+            assert(false, "testLoader(" ~ dataFilename ~ ", " ~ canonicalFilename ~ ") failed");
         }
     }
 }

test/src/emitter.d

@@ -83,7 +83,7 @@ void testEmitterOnData(bool verbose, string dataFilename, string canonicalFilena
 {
     //Must exist due to Anchor, Tags reference counts.
     auto loader = Loader(dataFilename);
-    auto events = loader.parse();
+    auto events = cast(Event[])loader.parse();
     auto emitStream = new MemoryStream;
     Dumper(emitStream).emit(events);
 
@@ -98,7 +98,7 @@ void testEmitterOnData(bool verbose, string dataFilename, string canonicalFilena
     loader2.name        = "TEST";
     loader2.constructor = new Constructor;
     loader2.resolver    = new Resolver;
-    auto newEvents = loader2.parse();
+    auto newEvents = cast(Event[])loader2.parse();
     assert(compareEvents(events, newEvents));
 }
 
@@ -114,7 +114,7 @@ void testEmitterOnCanonical(bool verbose, string canonicalFilename)
 {
     //Must exist due to Anchor, Tags reference counts.
     auto loader = Loader(canonicalFilename);
-    auto events = loader.parse();
+    auto events = cast(Event[])loader.parse();
     foreach(canonical; [false, true])
     {
         auto emitStream = new MemoryStream;
@@ -130,7 +130,7 @@ void testEmitterOnCanonical(bool verbose, string canonicalFilename)
         loader2.name        = "TEST";
         loader2.constructor = new Constructor;
         loader2.resolver    = new Resolver;
-        auto newEvents = loader2.parse();
+        auto newEvents = cast(Event[])loader2.parse();
         assert(compareEvents(events, newEvents));
     }
 }
@@ -151,7 +151,7 @@ void testEmitterStyles(bool verbose, string dataFilename, string canonicalFilena
     {
         //must exist due to Anchor, Tags reference counts
         auto loader = Loader(canonicalFilename);
-        auto events = loader.parse();
+        auto events = cast(Event[])loader.parse();
         foreach(flowStyle; [CollectionStyle.Block, CollectionStyle.Flow])
         {
             foreach(style; [ScalarStyle.Literal, ScalarStyle.Folded, 
@@ -191,7 +191,7 @@ void testEmitterStyles(bool verbose, string dataFilename, string canonicalFilena
                 loader2.name        = "TEST";
                 loader2.constructor = new Constructor;
                 loader2.resolver    = new Resolver;
-                auto newEvents = loader2.parse();
+                auto newEvents = cast(Event[])loader2.parse();
                 assert(compareEvents(events, newEvents));
             }
         }

test/src/errors.d

@@ -72,7 +72,8 @@ void testLoaderErrorFilename(bool verbose, string errorFilename)
         if(verbose){writeln(typeid(e).toString(), "\n", e);}
         return;
     }
-    assert(false, "Expected an exception");
+    assert(false, "testLoaderErrorSingle(" ~ to!string(verbose) ~ 
+                  ", " ~ errorFilename ~ ") Expected an exception");
 }
 
 /**