diff --git a/lib/metagrammar.js b/lib/metagrammar.js
index ad63540..211bbcd 100644
--- a/lib/metagrammar.js
+++ b/lib/metagrammar.js
@@ -792,66 +792,17 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos18 = this._pos;
-    var savedPos19 = this._pos;
-    var savedReportMatchFailuresVar1 = context.reportMatchFailures;
-    context.reportMatchFailures = false;
-    if (this._input.substr(this._pos, 1) === "{") {
-      var result102 = "{";
-      this._pos += 1;
+    if (this._input.substr(this._pos).match(/^[^{}]/) !== null) {
+      var result97 = this._input[this._pos];
+      this._pos++;
     } else {
-      var result102 = null;
+      var result97 = null;
       if (context.reportMatchFailures) {
-        this._matchFailed(new PEG.Parser.LiteralMatchFailure("{"));
-      }
-    }
-    if (result102 !== null) {
-      var result100 = result102;
-    } else {
-      if (this._input.substr(this._pos, 1) === "}") {
-        var result101 = "}";
-        this._pos += 1;
-      } else {
-        var result101 = null;
-        if (context.reportMatchFailures) {
-          this._matchFailed(new PEG.Parser.LiteralMatchFailure("}"));
-        }
-      }
-      if (result101 !== null) {
-        var result100 = result101;
-      } else {
-        var result100 = null;;
-      };
-    }
-    context.reportMatchFailures = savedReportMatchFailuresVar1;
-    if (result100 === null) {
-      var result98 = '';
-    } else {
-      var result98 = null;
-      this._pos = savedPos19;
-    }
-    if (result98 !== null) {
-      if (this._input.length > this._pos) {
-        var result99 = this._input[this._pos];
-        this._pos++;
-      } else {
-        var result99 = null;
-        if (context.reportMatchFailures) {
-          this._matchFailed(new PEG.Parser.AnyMatchFailure());
-        }
-      }
-      if (result99 !== null) {
-        var result97 = [result98, result99];
-      } else {
-        var result97 = null;
-        this._pos = savedPos18;
+        this._matchFailed(new PEG.Parser.ClassMatchFailure("^{}"));
       }
-    } else {
-      var result97 = null;
-      this._pos = savedPos18;
     }
     var result96 = result97 !== null
-      ? (function() {  return (arguments[1]);  }).apply(this, result97)
+      ? (function() {  return (arguments[0]);  }).call(this, result97)
       : null;
     
     
@@ -874,39 +825,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos20 = this._pos;
+    var savedPos18 = this._pos;
     if (this._input.substr(this._pos, 1) === ":") {
-      var result105 = ":";
+      var result100 = ":";
       this._pos += 1;
     } else {
-      var result105 = null;
+      var result100 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure(":"));
       }
     }
-    if (result105 !== null) {
-      var result106 = this._parse___(context);
-      if (result106 !== null) {
-        var result104 = [result105, result106];
+    if (result100 !== null) {
+      var result101 = this._parse___(context);
+      if (result101 !== null) {
+        var result99 = [result100, result101];
       } else {
-        var result104 = null;
-        this._pos = savedPos20;
+        var result99 = null;
+        this._pos = savedPos18;
       }
     } else {
-      var result104 = null;
-      this._pos = savedPos20;
+      var result99 = null;
+      this._pos = savedPos18;
     }
-    var result103 = result104 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result104)
+    var result98 = result99 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result99)
       : null;
     
     
     
     this._cache["colon"][pos] = {
       nextPos: this._pos,
-      result:  result103
+      result:  result98
     };
-    return result103;
+    return result98;
   };
   
   result._parse_slash = function(context) {
@@ -920,39 +871,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos21 = this._pos;
+    var savedPos19 = this._pos;
     if (this._input.substr(this._pos, 1) === "/") {
-      var result109 = "/";
+      var result104 = "/";
       this._pos += 1;
     } else {
-      var result109 = null;
+      var result104 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("/"));
       }
     }
-    if (result109 !== null) {
-      var result110 = this._parse___(context);
-      if (result110 !== null) {
-        var result108 = [result109, result110];
+    if (result104 !== null) {
+      var result105 = this._parse___(context);
+      if (result105 !== null) {
+        var result103 = [result104, result105];
       } else {
-        var result108 = null;
-        this._pos = savedPos21;
+        var result103 = null;
+        this._pos = savedPos19;
       }
     } else {
-      var result108 = null;
-      this._pos = savedPos21;
+      var result103 = null;
+      this._pos = savedPos19;
     }
-    var result107 = result108 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result108)
+    var result102 = result103 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result103)
       : null;
     
     
     
     this._cache["slash"][pos] = {
       nextPos: this._pos,
-      result:  result107
+      result:  result102
     };
-    return result107;
+    return result102;
   };
   
   result._parse_and = function(context) {
@@ -966,39 +917,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos22 = this._pos;
+    var savedPos20 = this._pos;
     if (this._input.substr(this._pos, 1) === "&") {
-      var result113 = "&";
+      var result108 = "&";
       this._pos += 1;
     } else {
-      var result113 = null;
+      var result108 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("&"));
       }
     }
-    if (result113 !== null) {
-      var result114 = this._parse___(context);
-      if (result114 !== null) {
-        var result112 = [result113, result114];
+    if (result108 !== null) {
+      var result109 = this._parse___(context);
+      if (result109 !== null) {
+        var result107 = [result108, result109];
       } else {
-        var result112 = null;
-        this._pos = savedPos22;
+        var result107 = null;
+        this._pos = savedPos20;
       }
     } else {
-      var result112 = null;
-      this._pos = savedPos22;
+      var result107 = null;
+      this._pos = savedPos20;
     }
-    var result111 = result112 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result112)
+    var result106 = result107 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result107)
       : null;
     
     
     
     this._cache["and"][pos] = {
       nextPos: this._pos,
-      result:  result111
+      result:  result106
     };
-    return result111;
+    return result106;
   };
   
   result._parse_not = function(context) {
@@ -1012,39 +963,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos23 = this._pos;
+    var savedPos21 = this._pos;
     if (this._input.substr(this._pos, 1) === "!") {
-      var result117 = "!";
+      var result112 = "!";
       this._pos += 1;
     } else {
-      var result117 = null;
+      var result112 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("!"));
       }
     }
-    if (result117 !== null) {
-      var result118 = this._parse___(context);
-      if (result118 !== null) {
-        var result116 = [result117, result118];
+    if (result112 !== null) {
+      var result113 = this._parse___(context);
+      if (result113 !== null) {
+        var result111 = [result112, result113];
       } else {
-        var result116 = null;
-        this._pos = savedPos23;
+        var result111 = null;
+        this._pos = savedPos21;
       }
     } else {
-      var result116 = null;
-      this._pos = savedPos23;
+      var result111 = null;
+      this._pos = savedPos21;
     }
-    var result115 = result116 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result116)
+    var result110 = result111 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result111)
       : null;
     
     
     
     this._cache["not"][pos] = {
       nextPos: this._pos,
-      result:  result115
+      result:  result110
     };
-    return result115;
+    return result110;
   };
   
   result._parse_question = function(context) {
@@ -1058,39 +1009,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos24 = this._pos;
+    var savedPos22 = this._pos;
     if (this._input.substr(this._pos, 1) === "?") {
-      var result121 = "?";
+      var result116 = "?";
       this._pos += 1;
     } else {
-      var result121 = null;
+      var result116 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("?"));
       }
     }
-    if (result121 !== null) {
-      var result122 = this._parse___(context);
-      if (result122 !== null) {
-        var result120 = [result121, result122];
+    if (result116 !== null) {
+      var result117 = this._parse___(context);
+      if (result117 !== null) {
+        var result115 = [result116, result117];
       } else {
-        var result120 = null;
-        this._pos = savedPos24;
+        var result115 = null;
+        this._pos = savedPos22;
       }
     } else {
-      var result120 = null;
-      this._pos = savedPos24;
+      var result115 = null;
+      this._pos = savedPos22;
     }
-    var result119 = result120 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result120)
+    var result114 = result115 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result115)
       : null;
     
     
     
     this._cache["question"][pos] = {
       nextPos: this._pos,
-      result:  result119
+      result:  result114
     };
-    return result119;
+    return result114;
   };
   
   result._parse_star = function(context) {
@@ -1104,39 +1055,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos25 = this._pos;
+    var savedPos23 = this._pos;
     if (this._input.substr(this._pos, 1) === "*") {
-      var result125 = "*";
+      var result120 = "*";
       this._pos += 1;
     } else {
-      var result125 = null;
+      var result120 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("*"));
       }
     }
-    if (result125 !== null) {
-      var result126 = this._parse___(context);
-      if (result126 !== null) {
-        var result124 = [result125, result126];
+    if (result120 !== null) {
+      var result121 = this._parse___(context);
+      if (result121 !== null) {
+        var result119 = [result120, result121];
       } else {
-        var result124 = null;
-        this._pos = savedPos25;
+        var result119 = null;
+        this._pos = savedPos23;
       }
     } else {
-      var result124 = null;
-      this._pos = savedPos25;
+      var result119 = null;
+      this._pos = savedPos23;
     }
-    var result123 = result124 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result124)
+    var result118 = result119 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result119)
       : null;
     
     
     
     this._cache["star"][pos] = {
       nextPos: this._pos,
-      result:  result123
+      result:  result118
     };
-    return result123;
+    return result118;
   };
   
   result._parse_plus = function(context) {
@@ -1150,39 +1101,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos26 = this._pos;
+    var savedPos24 = this._pos;
     if (this._input.substr(this._pos, 1) === "+") {
-      var result129 = "+";
+      var result124 = "+";
       this._pos += 1;
     } else {
-      var result129 = null;
+      var result124 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("+"));
       }
     }
-    if (result129 !== null) {
-      var result130 = this._parse___(context);
-      if (result130 !== null) {
-        var result128 = [result129, result130];
+    if (result124 !== null) {
+      var result125 = this._parse___(context);
+      if (result125 !== null) {
+        var result123 = [result124, result125];
       } else {
-        var result128 = null;
-        this._pos = savedPos26;
+        var result123 = null;
+        this._pos = savedPos24;
       }
     } else {
-      var result128 = null;
-      this._pos = savedPos26;
+      var result123 = null;
+      this._pos = savedPos24;
     }
-    var result127 = result128 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result128)
+    var result122 = result123 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result123)
       : null;
     
     
     
     this._cache["plus"][pos] = {
       nextPos: this._pos,
-      result:  result127
+      result:  result122
     };
-    return result127;
+    return result122;
   };
   
   result._parse_lparen = function(context) {
@@ -1196,39 +1147,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos27 = this._pos;
+    var savedPos25 = this._pos;
     if (this._input.substr(this._pos, 1) === "(") {
-      var result133 = "(";
+      var result128 = "(";
       this._pos += 1;
     } else {
-      var result133 = null;
+      var result128 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("("));
       }
     }
-    if (result133 !== null) {
-      var result134 = this._parse___(context);
-      if (result134 !== null) {
-        var result132 = [result133, result134];
+    if (result128 !== null) {
+      var result129 = this._parse___(context);
+      if (result129 !== null) {
+        var result127 = [result128, result129];
       } else {
-        var result132 = null;
-        this._pos = savedPos27;
+        var result127 = null;
+        this._pos = savedPos25;
       }
     } else {
-      var result132 = null;
-      this._pos = savedPos27;
+      var result127 = null;
+      this._pos = savedPos25;
     }
-    var result131 = result132 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result132)
+    var result126 = result127 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result127)
       : null;
     
     
     
     this._cache["lparen"][pos] = {
       nextPos: this._pos,
-      result:  result131
+      result:  result126
     };
-    return result131;
+    return result126;
   };
   
   result._parse_rparen = function(context) {
@@ -1242,39 +1193,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos28 = this._pos;
+    var savedPos26 = this._pos;
     if (this._input.substr(this._pos, 1) === ")") {
-      var result137 = ")";
+      var result132 = ")";
       this._pos += 1;
     } else {
-      var result137 = null;
+      var result132 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure(")"));
       }
     }
-    if (result137 !== null) {
-      var result138 = this._parse___(context);
-      if (result138 !== null) {
-        var result136 = [result137, result138];
+    if (result132 !== null) {
+      var result133 = this._parse___(context);
+      if (result133 !== null) {
+        var result131 = [result132, result133];
       } else {
-        var result136 = null;
-        this._pos = savedPos28;
+        var result131 = null;
+        this._pos = savedPos26;
       }
     } else {
-      var result136 = null;
-      this._pos = savedPos28;
+      var result131 = null;
+      this._pos = savedPos26;
     }
-    var result135 = result136 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result136)
+    var result130 = result131 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result131)
       : null;
     
     
     
     this._cache["rparen"][pos] = {
       nextPos: this._pos,
-      result:  result135
+      result:  result130
     };
-    return result135;
+    return result130;
   };
   
   result._parse_dot = function(context) {
@@ -1288,39 +1239,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos29 = this._pos;
+    var savedPos27 = this._pos;
     if (this._input.substr(this._pos, 1) === ".") {
-      var result141 = ".";
+      var result136 = ".";
       this._pos += 1;
     } else {
-      var result141 = null;
+      var result136 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("."));
       }
     }
-    if (result141 !== null) {
-      var result142 = this._parse___(context);
-      if (result142 !== null) {
-        var result140 = [result141, result142];
+    if (result136 !== null) {
+      var result137 = this._parse___(context);
+      if (result137 !== null) {
+        var result135 = [result136, result137];
       } else {
-        var result140 = null;
-        this._pos = savedPos29;
+        var result135 = null;
+        this._pos = savedPos27;
       }
     } else {
-      var result140 = null;
-      this._pos = savedPos29;
+      var result135 = null;
+      this._pos = savedPos27;
     }
-    var result139 = result140 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result140)
+    var result134 = result135 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result135)
       : null;
     
     
     
     this._cache["dot"][pos] = {
       nextPos: this._pos,
-      result:  result139
+      result:  result134
     };
-    return result139;
+    return result134;
   };
   
   result._parse_identifier = function(context) {
@@ -1335,149 +1286,149 @@ PEG.grammarParser = (function(){
     
     var savedReportMatchFailures = context.reportMatchFailures;
     context.reportMatchFailures = false;
-    var savedPos30 = this._pos;
-    var result155 = this._parse_letter(context);
-    if (result155 !== null) {
-      var result145 = result155;
+    var savedPos28 = this._pos;
+    var result150 = this._parse_letter(context);
+    if (result150 !== null) {
+      var result140 = result150;
     } else {
       if (this._input.substr(this._pos, 1) === "_") {
-        var result154 = "_";
+        var result149 = "_";
         this._pos += 1;
       } else {
-        var result154 = null;
+        var result149 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("_"));
         }
       }
-      if (result154 !== null) {
-        var result145 = result154;
+      if (result149 !== null) {
+        var result140 = result149;
       } else {
         if (this._input.substr(this._pos, 1) === "$") {
-          var result153 = "$";
+          var result148 = "$";
           this._pos += 1;
         } else {
-          var result153 = null;
+          var result148 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("$"));
           }
         }
-        if (result153 !== null) {
-          var result145 = result153;
+        if (result148 !== null) {
+          var result140 = result148;
         } else {
-          var result145 = null;;
+          var result140 = null;;
         };
       };
     }
-    if (result145 !== null) {
-      var result146 = [];
-      var result152 = this._parse_letter(context);
-      if (result152 !== null) {
-        var result148 = result152;
+    if (result140 !== null) {
+      var result141 = [];
+      var result147 = this._parse_letter(context);
+      if (result147 !== null) {
+        var result143 = result147;
       } else {
-        var result151 = this._parse_digit(context);
-        if (result151 !== null) {
-          var result148 = result151;
+        var result146 = this._parse_digit(context);
+        if (result146 !== null) {
+          var result143 = result146;
         } else {
           if (this._input.substr(this._pos, 1) === "_") {
-            var result150 = "_";
+            var result145 = "_";
             this._pos += 1;
           } else {
-            var result150 = null;
+            var result145 = null;
             if (context.reportMatchFailures) {
               this._matchFailed(new PEG.Parser.LiteralMatchFailure("_"));
             }
           }
-          if (result150 !== null) {
-            var result148 = result150;
+          if (result145 !== null) {
+            var result143 = result145;
           } else {
             if (this._input.substr(this._pos, 1) === "$") {
-              var result149 = "$";
+              var result144 = "$";
               this._pos += 1;
             } else {
-              var result149 = null;
+              var result144 = null;
               if (context.reportMatchFailures) {
                 this._matchFailed(new PEG.Parser.LiteralMatchFailure("$"));
               }
             }
-            if (result149 !== null) {
-              var result148 = result149;
+            if (result144 !== null) {
+              var result143 = result144;
             } else {
-              var result148 = null;;
+              var result143 = null;;
             };
           };
         };
       }
-      while (result148 !== null) {
-        result146.push(result148);
-        var result152 = this._parse_letter(context);
-        if (result152 !== null) {
-          var result148 = result152;
+      while (result143 !== null) {
+        result141.push(result143);
+        var result147 = this._parse_letter(context);
+        if (result147 !== null) {
+          var result143 = result147;
         } else {
-          var result151 = this._parse_digit(context);
-          if (result151 !== null) {
-            var result148 = result151;
+          var result146 = this._parse_digit(context);
+          if (result146 !== null) {
+            var result143 = result146;
           } else {
             if (this._input.substr(this._pos, 1) === "_") {
-              var result150 = "_";
+              var result145 = "_";
               this._pos += 1;
             } else {
-              var result150 = null;
+              var result145 = null;
               if (context.reportMatchFailures) {
                 this._matchFailed(new PEG.Parser.LiteralMatchFailure("_"));
               }
             }
-            if (result150 !== null) {
-              var result148 = result150;
+            if (result145 !== null) {
+              var result143 = result145;
             } else {
               if (this._input.substr(this._pos, 1) === "$") {
-                var result149 = "$";
+                var result144 = "$";
                 this._pos += 1;
               } else {
-                var result149 = null;
+                var result144 = null;
                 if (context.reportMatchFailures) {
                   this._matchFailed(new PEG.Parser.LiteralMatchFailure("$"));
                 }
               }
-              if (result149 !== null) {
-                var result148 = result149;
+              if (result144 !== null) {
+                var result143 = result144;
               } else {
-                var result148 = null;;
+                var result143 = null;;
               };
             };
           };
         }
       }
-      if (result146 !== null) {
-        var result147 = this._parse___(context);
-        if (result147 !== null) {
-          var result144 = [result145, result146, result147];
+      if (result141 !== null) {
+        var result142 = this._parse___(context);
+        if (result142 !== null) {
+          var result139 = [result140, result141, result142];
         } else {
-          var result144 = null;
-          this._pos = savedPos30;
+          var result139 = null;
+          this._pos = savedPos28;
         }
       } else {
-        var result144 = null;
-        this._pos = savedPos30;
+        var result139 = null;
+        this._pos = savedPos28;
       }
     } else {
-      var result144 = null;
-      this._pos = savedPos30;
+      var result139 = null;
+      this._pos = savedPos28;
     }
-    var result143 = result144 !== null
+    var result138 = result139 !== null
       ? (function() { 
         return (arguments[0]) + (arguments[1]).join("");
-       }).apply(this, result144)
+       }).apply(this, result139)
       : null;
     context.reportMatchFailures = savedReportMatchFailures;
-    if (context.reportMatchFailures && result143 === null) {
+    if (context.reportMatchFailures && result138 === null) {
       this._matchFailed(new PEG.Parser.NamedRuleMatchFailure("identifier"));
     }
     
     this._cache["identifier"][pos] = {
       nextPos: this._pos,
-      result:  result143
+      result:  result138
     };
-    return result143;
+    return result138;
   };
   
   result._parse_literal = function(context) {
@@ -1492,43 +1443,43 @@ PEG.grammarParser = (function(){
     
     var savedReportMatchFailures = context.reportMatchFailures;
     context.reportMatchFailures = false;
-    var savedPos31 = this._pos;
-    var result161 = this._parse_doubleQuotedLiteral(context);
-    if (result161 !== null) {
-      var result158 = result161;
+    var savedPos29 = this._pos;
+    var result156 = this._parse_doubleQuotedLiteral(context);
+    if (result156 !== null) {
+      var result153 = result156;
     } else {
-      var result160 = this._parse_singleQuotedLiteral(context);
-      if (result160 !== null) {
-        var result158 = result160;
+      var result155 = this._parse_singleQuotedLiteral(context);
+      if (result155 !== null) {
+        var result153 = result155;
       } else {
-        var result158 = null;;
+        var result153 = null;;
       };
     }
-    if (result158 !== null) {
-      var result159 = this._parse___(context);
-      if (result159 !== null) {
-        var result157 = [result158, result159];
+    if (result153 !== null) {
+      var result154 = this._parse___(context);
+      if (result154 !== null) {
+        var result152 = [result153, result154];
       } else {
-        var result157 = null;
-        this._pos = savedPos31;
+        var result152 = null;
+        this._pos = savedPos29;
       }
     } else {
-      var result157 = null;
-      this._pos = savedPos31;
+      var result152 = null;
+      this._pos = savedPos29;
     }
-    var result156 = result157 !== null
-      ? (function() {  return (arguments[0]);  }).apply(this, result157)
+    var result151 = result152 !== null
+      ? (function() {  return (arguments[0]);  }).apply(this, result152)
       : null;
     context.reportMatchFailures = savedReportMatchFailures;
-    if (context.reportMatchFailures && result156 === null) {
+    if (context.reportMatchFailures && result151 === null) {
       this._matchFailed(new PEG.Parser.NamedRuleMatchFailure("literal"));
     }
     
     this._cache["literal"][pos] = {
       nextPos: this._pos,
-      result:  result156
+      result:  result151
     };
-    return result156;
+    return result151;
   };
   
   result._parse_doubleQuotedLiteral = function(context) {
@@ -1542,58 +1493,58 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos32 = this._pos;
+    var savedPos30 = this._pos;
     if (this._input.substr(this._pos, 1) === "\"") {
-      var result164 = "\"";
+      var result159 = "\"";
       this._pos += 1;
     } else {
-      var result164 = null;
+      var result159 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\""));
       }
     }
-    if (result164 !== null) {
-      var result165 = [];
-      var result167 = this._parse_doubleQuotedCharacter(context);
-      while (result167 !== null) {
-        result165.push(result167);
-        var result167 = this._parse_doubleQuotedCharacter(context);
+    if (result159 !== null) {
+      var result160 = [];
+      var result162 = this._parse_doubleQuotedCharacter(context);
+      while (result162 !== null) {
+        result160.push(result162);
+        var result162 = this._parse_doubleQuotedCharacter(context);
       }
-      if (result165 !== null) {
+      if (result160 !== null) {
         if (this._input.substr(this._pos, 1) === "\"") {
-          var result166 = "\"";
+          var result161 = "\"";
           this._pos += 1;
         } else {
-          var result166 = null;
+          var result161 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("\""));
           }
         }
-        if (result166 !== null) {
-          var result163 = [result164, result165, result166];
+        if (result161 !== null) {
+          var result158 = [result159, result160, result161];
         } else {
-          var result163 = null;
-          this._pos = savedPos32;
+          var result158 = null;
+          this._pos = savedPos30;
         }
       } else {
-        var result163 = null;
-        this._pos = savedPos32;
+        var result158 = null;
+        this._pos = savedPos30;
       }
     } else {
-      var result163 = null;
-      this._pos = savedPos32;
+      var result158 = null;
+      this._pos = savedPos30;
     }
-    var result162 = result163 !== null
-      ? (function() {  return (arguments[1]).join("");  }).apply(this, result163)
+    var result157 = result158 !== null
+      ? (function() {  return (arguments[1]).join("");  }).apply(this, result158)
       : null;
     
     
     
     this._cache["doubleQuotedLiteral"][pos] = {
       nextPos: this._pos,
-      result:  result162
+      result:  result157
     };
-    return result162;
+    return result157;
   };
   
   result._parse_doubleQuotedCharacter = function(context) {
@@ -1607,31 +1558,31 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var result174 = this._parse_simpleDoubleQuotedCharacter(context);
-    if (result174 !== null) {
-      var result168 = result174;
+    var result169 = this._parse_simpleDoubleQuotedCharacter(context);
+    if (result169 !== null) {
+      var result163 = result169;
     } else {
-      var result173 = this._parse_simpleEscapeSequence(context);
-      if (result173 !== null) {
-        var result168 = result173;
+      var result168 = this._parse_simpleEscapeSequence(context);
+      if (result168 !== null) {
+        var result163 = result168;
       } else {
-        var result172 = this._parse_zeroEscapeSequence(context);
-        if (result172 !== null) {
-          var result168 = result172;
+        var result167 = this._parse_zeroEscapeSequence(context);
+        if (result167 !== null) {
+          var result163 = result167;
         } else {
-          var result171 = this._parse_hexEscapeSequence(context);
-          if (result171 !== null) {
-            var result168 = result171;
+          var result166 = this._parse_hexEscapeSequence(context);
+          if (result166 !== null) {
+            var result163 = result166;
           } else {
-            var result170 = this._parse_unicodeEscapeSequence(context);
-            if (result170 !== null) {
-              var result168 = result170;
+            var result165 = this._parse_unicodeEscapeSequence(context);
+            if (result165 !== null) {
+              var result163 = result165;
             } else {
-              var result169 = this._parse_eolEscapeSequence(context);
-              if (result169 !== null) {
-                var result168 = result169;
+              var result164 = this._parse_eolEscapeSequence(context);
+              if (result164 !== null) {
+                var result163 = result164;
               } else {
-                var result168 = null;;
+                var result163 = null;;
               };
             };
           };
@@ -1643,9 +1594,9 @@ PEG.grammarParser = (function(){
     
     this._cache["doubleQuotedCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result168
+      result:  result163
     };
-    return result168;
+    return result163;
   };
   
   result._parse_simpleDoubleQuotedCharacter = function(context) {
@@ -1659,80 +1610,80 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos33 = this._pos;
-    var savedPos34 = this._pos;
-    var savedReportMatchFailuresVar2 = context.reportMatchFailures;
+    var savedPos31 = this._pos;
+    var savedPos32 = this._pos;
+    var savedReportMatchFailuresVar1 = context.reportMatchFailures;
     context.reportMatchFailures = false;
     if (this._input.substr(this._pos, 1) === "\"") {
-      var result182 = "\"";
+      var result177 = "\"";
       this._pos += 1;
     } else {
-      var result182 = null;
+      var result177 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\""));
       }
     }
-    if (result182 !== null) {
-      var result179 = result182;
+    if (result177 !== null) {
+      var result174 = result177;
     } else {
       if (this._input.substr(this._pos, 1) === "\\") {
-        var result181 = "\\";
+        var result176 = "\\";
         this._pos += 1;
       } else {
-        var result181 = null;
+        var result176 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\"));
         }
       }
-      if (result181 !== null) {
-        var result179 = result181;
+      if (result176 !== null) {
+        var result174 = result176;
       } else {
-        var result180 = this._parse_eolChar(context);
-        if (result180 !== null) {
-          var result179 = result180;
+        var result175 = this._parse_eolChar(context);
+        if (result175 !== null) {
+          var result174 = result175;
         } else {
-          var result179 = null;;
+          var result174 = null;;
         };
       };
     }
-    context.reportMatchFailures = savedReportMatchFailuresVar2;
-    if (result179 === null) {
-      var result177 = '';
+    context.reportMatchFailures = savedReportMatchFailuresVar1;
+    if (result174 === null) {
+      var result172 = '';
     } else {
-      var result177 = null;
-      this._pos = savedPos34;
+      var result172 = null;
+      this._pos = savedPos32;
     }
-    if (result177 !== null) {
+    if (result172 !== null) {
       if (this._input.length > this._pos) {
-        var result178 = this._input[this._pos];
+        var result173 = this._input[this._pos];
         this._pos++;
       } else {
-        var result178 = null;
+        var result173 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.AnyMatchFailure());
         }
       }
-      if (result178 !== null) {
-        var result176 = [result177, result178];
+      if (result173 !== null) {
+        var result171 = [result172, result173];
       } else {
-        var result176 = null;
-        this._pos = savedPos33;
+        var result171 = null;
+        this._pos = savedPos31;
       }
     } else {
-      var result176 = null;
-      this._pos = savedPos33;
+      var result171 = null;
+      this._pos = savedPos31;
     }
-    var result175 = result176 !== null
-      ? (function() {  return (arguments[1]);  }).apply(this, result176)
+    var result170 = result171 !== null
+      ? (function() {  return (arguments[1]);  }).apply(this, result171)
       : null;
     
     
     
     this._cache["simpleDoubleQuotedCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result175
+      result:  result170
     };
-    return result175;
+    return result170;
   };
   
   result._parse_singleQuotedLiteral = function(context) {
@@ -1746,58 +1697,58 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos35 = this._pos;
+    var savedPos33 = this._pos;
     if (this._input.substr(this._pos, 1) === "'") {
-      var result185 = "'";
+      var result180 = "'";
       this._pos += 1;
     } else {
-      var result185 = null;
+      var result180 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("'"));
       }
     }
-    if (result185 !== null) {
-      var result186 = [];
-      var result188 = this._parse_singleQuotedCharacter(context);
-      while (result188 !== null) {
-        result186.push(result188);
-        var result188 = this._parse_singleQuotedCharacter(context);
+    if (result180 !== null) {
+      var result181 = [];
+      var result183 = this._parse_singleQuotedCharacter(context);
+      while (result183 !== null) {
+        result181.push(result183);
+        var result183 = this._parse_singleQuotedCharacter(context);
       }
-      if (result186 !== null) {
+      if (result181 !== null) {
         if (this._input.substr(this._pos, 1) === "'") {
-          var result187 = "'";
+          var result182 = "'";
           this._pos += 1;
         } else {
-          var result187 = null;
+          var result182 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("'"));
           }
         }
-        if (result187 !== null) {
-          var result184 = [result185, result186, result187];
+        if (result182 !== null) {
+          var result179 = [result180, result181, result182];
         } else {
-          var result184 = null;
-          this._pos = savedPos35;
+          var result179 = null;
+          this._pos = savedPos33;
         }
       } else {
-        var result184 = null;
-        this._pos = savedPos35;
+        var result179 = null;
+        this._pos = savedPos33;
       }
     } else {
-      var result184 = null;
-      this._pos = savedPos35;
+      var result179 = null;
+      this._pos = savedPos33;
     }
-    var result183 = result184 !== null
-      ? (function() {  return (arguments[1]).join("");  }).apply(this, result184)
+    var result178 = result179 !== null
+      ? (function() {  return (arguments[1]).join("");  }).apply(this, result179)
       : null;
     
     
     
     this._cache["singleQuotedLiteral"][pos] = {
       nextPos: this._pos,
-      result:  result183
+      result:  result178
     };
-    return result183;
+    return result178;
   };
   
   result._parse_singleQuotedCharacter = function(context) {
@@ -1811,31 +1762,31 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var result195 = this._parse_simpleSingleQuotedCharacter(context);
-    if (result195 !== null) {
-      var result189 = result195;
+    var result190 = this._parse_simpleSingleQuotedCharacter(context);
+    if (result190 !== null) {
+      var result184 = result190;
     } else {
-      var result194 = this._parse_simpleEscapeSequence(context);
-      if (result194 !== null) {
-        var result189 = result194;
+      var result189 = this._parse_simpleEscapeSequence(context);
+      if (result189 !== null) {
+        var result184 = result189;
       } else {
-        var result193 = this._parse_zeroEscapeSequence(context);
-        if (result193 !== null) {
-          var result189 = result193;
+        var result188 = this._parse_zeroEscapeSequence(context);
+        if (result188 !== null) {
+          var result184 = result188;
         } else {
-          var result192 = this._parse_hexEscapeSequence(context);
-          if (result192 !== null) {
-            var result189 = result192;
+          var result187 = this._parse_hexEscapeSequence(context);
+          if (result187 !== null) {
+            var result184 = result187;
           } else {
-            var result191 = this._parse_unicodeEscapeSequence(context);
-            if (result191 !== null) {
-              var result189 = result191;
+            var result186 = this._parse_unicodeEscapeSequence(context);
+            if (result186 !== null) {
+              var result184 = result186;
             } else {
-              var result190 = this._parse_eolEscapeSequence(context);
-              if (result190 !== null) {
-                var result189 = result190;
+              var result185 = this._parse_eolEscapeSequence(context);
+              if (result185 !== null) {
+                var result184 = result185;
               } else {
-                var result189 = null;;
+                var result184 = null;;
               };
             };
           };
@@ -1847,9 +1798,9 @@ PEG.grammarParser = (function(){
     
     this._cache["singleQuotedCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result189
+      result:  result184
     };
-    return result189;
+    return result184;
   };
   
   result._parse_simpleSingleQuotedCharacter = function(context) {
@@ -1863,80 +1814,80 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos36 = this._pos;
-    var savedPos37 = this._pos;
-    var savedReportMatchFailuresVar3 = context.reportMatchFailures;
+    var savedPos34 = this._pos;
+    var savedPos35 = this._pos;
+    var savedReportMatchFailuresVar2 = context.reportMatchFailures;
     context.reportMatchFailures = false;
     if (this._input.substr(this._pos, 1) === "'") {
-      var result203 = "'";
+      var result198 = "'";
       this._pos += 1;
     } else {
-      var result203 = null;
+      var result198 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("'"));
       }
     }
-    if (result203 !== null) {
-      var result200 = result203;
+    if (result198 !== null) {
+      var result195 = result198;
     } else {
       if (this._input.substr(this._pos, 1) === "\\") {
-        var result202 = "\\";
+        var result197 = "\\";
         this._pos += 1;
       } else {
-        var result202 = null;
+        var result197 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\"));
         }
       }
-      if (result202 !== null) {
-        var result200 = result202;
+      if (result197 !== null) {
+        var result195 = result197;
       } else {
-        var result201 = this._parse_eolChar(context);
-        if (result201 !== null) {
-          var result200 = result201;
+        var result196 = this._parse_eolChar(context);
+        if (result196 !== null) {
+          var result195 = result196;
         } else {
-          var result200 = null;;
+          var result195 = null;;
         };
       };
     }
-    context.reportMatchFailures = savedReportMatchFailuresVar3;
-    if (result200 === null) {
-      var result198 = '';
+    context.reportMatchFailures = savedReportMatchFailuresVar2;
+    if (result195 === null) {
+      var result193 = '';
     } else {
-      var result198 = null;
-      this._pos = savedPos37;
+      var result193 = null;
+      this._pos = savedPos35;
     }
-    if (result198 !== null) {
+    if (result193 !== null) {
       if (this._input.length > this._pos) {
-        var result199 = this._input[this._pos];
+        var result194 = this._input[this._pos];
         this._pos++;
       } else {
-        var result199 = null;
+        var result194 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.AnyMatchFailure());
         }
       }
-      if (result199 !== null) {
-        var result197 = [result198, result199];
+      if (result194 !== null) {
+        var result192 = [result193, result194];
       } else {
-        var result197 = null;
-        this._pos = savedPos36;
+        var result192 = null;
+        this._pos = savedPos34;
       }
     } else {
-      var result197 = null;
-      this._pos = savedPos36;
+      var result192 = null;
+      this._pos = savedPos34;
     }
-    var result196 = result197 !== null
-      ? (function() {  return (arguments[1]);  }).apply(this, result197)
+    var result191 = result192 !== null
+      ? (function() {  return (arguments[1]);  }).apply(this, result192)
       : null;
     
     
     
     this._cache["simpleSingleQuotedCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result196
+      result:  result191
     };
-    return result196;
+    return result191;
   };
   
   result._parse_class = function(context) {
@@ -1951,88 +1902,120 @@ PEG.grammarParser = (function(){
     
     var savedReportMatchFailures = context.reportMatchFailures;
     context.reportMatchFailures = false;
-    var savedPos38 = this._pos;
+    var savedPos36 = this._pos;
     if (this._input.substr(this._pos, 1) === "[") {
-      var result206 = "[";
+      var result201 = "[";
       this._pos += 1;
     } else {
-      var result206 = null;
+      var result201 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("["));
       }
     }
-    if (result206 !== null) {
-      var result207 = [];
-      var result212 = this._parse_classCharacterRange(context);
-      if (result212 !== null) {
-        var result210 = result212;
+    if (result201 !== null) {
+      if (this._input.substr(this._pos, 1) === "^") {
+        var result210 = "^";
+        this._pos += 1;
+      } else {
+        var result210 = null;
+        if (context.reportMatchFailures) {
+          this._matchFailed(new PEG.Parser.LiteralMatchFailure("^"));
+        }
+      }
+      if (result210 !== null) {
+        var result202 = result210;
       } else {
-        var result211 = this._parse_classCharacter(context);
-        if (result211 !== null) {
-          var result210 = result211;
+        if (this._input.substr(this._pos, 0) === "") {
+          var result209 = "";
+          this._pos += 0;
+        } else {
+          var result209 = null;
+          if (context.reportMatchFailures) {
+            this._matchFailed(new PEG.Parser.LiteralMatchFailure(""));
+          }
+        }
+        if (result209 !== null) {
+          var result202 = result209;
         } else {
-          var result210 = null;;
+          var result202 = null;;
         };
       }
-      while (result210 !== null) {
-        result207.push(result210);
-        var result212 = this._parse_classCharacterRange(context);
-        if (result212 !== null) {
-          var result210 = result212;
+      if (result202 !== null) {
+        var result203 = [];
+        var result208 = this._parse_classCharacterRange(context);
+        if (result208 !== null) {
+          var result206 = result208;
         } else {
-          var result211 = this._parse_classCharacter(context);
-          if (result211 !== null) {
-            var result210 = result211;
+          var result207 = this._parse_classCharacter(context);
+          if (result207 !== null) {
+            var result206 = result207;
           } else {
-            var result210 = null;;
+            var result206 = null;;
           };
         }
-      }
-      if (result207 !== null) {
-        if (this._input.substr(this._pos, 1) === "]") {
-          var result208 = "]";
-          this._pos += 1;
-        } else {
-          var result208 = null;
-          if (context.reportMatchFailures) {
-            this._matchFailed(new PEG.Parser.LiteralMatchFailure("]"));
+        while (result206 !== null) {
+          result203.push(result206);
+          var result208 = this._parse_classCharacterRange(context);
+          if (result208 !== null) {
+            var result206 = result208;
+          } else {
+            var result207 = this._parse_classCharacter(context);
+            if (result207 !== null) {
+              var result206 = result207;
+            } else {
+              var result206 = null;;
+            };
           }
         }
-        if (result208 !== null) {
-          var result209 = this._parse___(context);
-          if (result209 !== null) {
-            var result205 = [result206, result207, result208, result209];
+        if (result203 !== null) {
+          if (this._input.substr(this._pos, 1) === "]") {
+            var result204 = "]";
+            this._pos += 1;
           } else {
-            var result205 = null;
-            this._pos = savedPos38;
+            var result204 = null;
+            if (context.reportMatchFailures) {
+              this._matchFailed(new PEG.Parser.LiteralMatchFailure("]"));
+            }
+          }
+          if (result204 !== null) {
+            var result205 = this._parse___(context);
+            if (result205 !== null) {
+              var result200 = [result201, result202, result203, result204, result205];
+            } else {
+              var result200 = null;
+              this._pos = savedPos36;
+            }
+          } else {
+            var result200 = null;
+            this._pos = savedPos36;
           }
         } else {
-          var result205 = null;
-          this._pos = savedPos38;
+          var result200 = null;
+          this._pos = savedPos36;
         }
       } else {
-        var result205 = null;
-        this._pos = savedPos38;
+        var result200 = null;
+        this._pos = savedPos36;
       }
     } else {
-      var result205 = null;
-      this._pos = savedPos38;
+      var result200 = null;
+      this._pos = savedPos36;
     }
-    var result204 = result205 !== null
+    var result199 = result200 !== null
       ? (function() { 
-        return (arguments[1]).join("");
-       }).apply(this, result205)
+        return (arguments[1]) + (arguments[2]).join("");
+       }).apply(this, result200)
       : null;
     context.reportMatchFailures = savedReportMatchFailures;
-    if (context.reportMatchFailures && result204 === null) {
+    if (context.reportMatchFailures && result199 === null) {
       this._matchFailed(new PEG.Parser.NamedRuleMatchFailure("character class"));
     }
     
     this._cache["class"][pos] = {
       nextPos: this._pos,
-      result:  result204
+      result:  result199
     };
-    return result204;
+    return result199;
   };
   
   result._parse_classCharacterRange = function(context) {
@@ -2046,35 +2029,35 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos39 = this._pos;
-    var result215 = this._parse_bracketDelimitedCharacter(context);
-    if (result215 !== null) {
+    var savedPos37 = this._pos;
+    var result213 = this._parse_bracketDelimitedCharacter(context);
+    if (result213 !== null) {
       if (this._input.substr(this._pos, 1) === "-") {
-        var result216 = "-";
+        var result214 = "-";
         this._pos += 1;
       } else {
-        var result216 = null;
+        var result214 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("-"));
         }
       }
-      if (result216 !== null) {
-        var result217 = this._parse_bracketDelimitedCharacter(context);
-        if (result217 !== null) {
-          var result214 = [result215, result216, result217];
+      if (result214 !== null) {
+        var result215 = this._parse_bracketDelimitedCharacter(context);
+        if (result215 !== null) {
+          var result212 = [result213, result214, result215];
         } else {
-          var result214 = null;
-          this._pos = savedPos39;
+          var result212 = null;
+          this._pos = savedPos37;
         }
       } else {
-        var result214 = null;
-        this._pos = savedPos39;
+        var result212 = null;
+        this._pos = savedPos37;
       }
     } else {
-      var result214 = null;
-      this._pos = savedPos39;
+      var result212 = null;
+      this._pos = savedPos37;
     }
-    var result213 = result214 !== null
+    var result211 = result212 !== null
       ? (function() { 
         if ((arguments[0]).charCodeAt(0) > (arguments[2]).charCodeAt(0)) {
           throw new PEG.Parser.SyntaxError(
@@ -2089,16 +2072,16 @@ PEG.grammarParser = (function(){
         return PEG.RegExpUtils.quoteForClass((arguments[0]))
           + "-"
           + PEG.RegExpUtils.quoteForClass((arguments[2]));
-       }).apply(this, result214)
+       }).apply(this, result212)
       : null;
     
     
     
     this._cache["classCharacterRange"][pos] = {
       nextPos: this._pos,
-      result:  result213
+      result:  result211
     };
-    return result213;
+    return result211;
   };
   
   result._parse_classCharacter = function(context) {
@@ -2112,20 +2095,20 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var result219 = this._parse_bracketDelimitedCharacter(context);
-    var result218 = result219 !== null
+    var result217 = this._parse_bracketDelimitedCharacter(context);
+    var result216 = result217 !== null
       ? (function() { 
         return PEG.RegExpUtils.quoteForClass((arguments[0]));
-       }).call(this, result219)
+       }).call(this, result217)
       : null;
     
     
     
     this._cache["classCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result218
+      result:  result216
     };
-    return result218;
+    return result216;
   };
   
   result._parse_bracketDelimitedCharacter = function(context) {
@@ -2139,31 +2122,31 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var result226 = this._parse_simpleBracketDelimitedCharacter(context);
-    if (result226 !== null) {
-      var result220 = result226;
+    var result224 = this._parse_simpleBracketDelimitedCharacter(context);
+    if (result224 !== null) {
+      var result218 = result224;
     } else {
-      var result225 = this._parse_simpleEscapeSequence(context);
-      if (result225 !== null) {
-        var result220 = result225;
+      var result223 = this._parse_simpleEscapeSequence(context);
+      if (result223 !== null) {
+        var result218 = result223;
       } else {
-        var result224 = this._parse_zeroEscapeSequence(context);
-        if (result224 !== null) {
-          var result220 = result224;
+        var result222 = this._parse_zeroEscapeSequence(context);
+        if (result222 !== null) {
+          var result218 = result222;
         } else {
-          var result223 = this._parse_hexEscapeSequence(context);
-          if (result223 !== null) {
-            var result220 = result223;
+          var result221 = this._parse_hexEscapeSequence(context);
+          if (result221 !== null) {
+            var result218 = result221;
           } else {
-            var result222 = this._parse_unicodeEscapeSequence(context);
-            if (result222 !== null) {
-              var result220 = result222;
+            var result220 = this._parse_unicodeEscapeSequence(context);
+            if (result220 !== null) {
+              var result218 = result220;
             } else {
-              var result221 = this._parse_eolEscapeSequence(context);
-              if (result221 !== null) {
-                var result220 = result221;
+              var result219 = this._parse_eolEscapeSequence(context);
+              if (result219 !== null) {
+                var result218 = result219;
               } else {
-                var result220 = null;;
+                var result218 = null;;
               };
             };
           };
@@ -2175,9 +2158,9 @@ PEG.grammarParser = (function(){
     
     this._cache["bracketDelimitedCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result220
+      result:  result218
     };
-    return result220;
+    return result218;
   };
   
   result._parse_simpleBracketDelimitedCharacter = function(context) {
@@ -2191,80 +2174,80 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos40 = this._pos;
-    var savedPos41 = this._pos;
-    var savedReportMatchFailuresVar4 = context.reportMatchFailures;
+    var savedPos38 = this._pos;
+    var savedPos39 = this._pos;
+    var savedReportMatchFailuresVar3 = context.reportMatchFailures;
     context.reportMatchFailures = false;
     if (this._input.substr(this._pos, 1) === "]") {
-      var result234 = "]";
+      var result232 = "]";
       this._pos += 1;
     } else {
-      var result234 = null;
+      var result232 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("]"));
       }
     }
-    if (result234 !== null) {
-      var result231 = result234;
+    if (result232 !== null) {
+      var result229 = result232;
     } else {
       if (this._input.substr(this._pos, 1) === "\\") {
-        var result233 = "\\";
+        var result231 = "\\";
         this._pos += 1;
       } else {
-        var result233 = null;
+        var result231 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\"));
         }
       }
-      if (result233 !== null) {
-        var result231 = result233;
+      if (result231 !== null) {
+        var result229 = result231;
       } else {
-        var result232 = this._parse_eolChar(context);
-        if (result232 !== null) {
-          var result231 = result232;
+        var result230 = this._parse_eolChar(context);
+        if (result230 !== null) {
+          var result229 = result230;
         } else {
-          var result231 = null;;
+          var result229 = null;;
         };
       };
     }
-    context.reportMatchFailures = savedReportMatchFailuresVar4;
-    if (result231 === null) {
-      var result229 = '';
+    context.reportMatchFailures = savedReportMatchFailuresVar3;
+    if (result229 === null) {
+      var result227 = '';
     } else {
-      var result229 = null;
-      this._pos = savedPos41;
+      var result227 = null;
+      this._pos = savedPos39;
     }
-    if (result229 !== null) {
+    if (result227 !== null) {
       if (this._input.length > this._pos) {
-        var result230 = this._input[this._pos];
+        var result228 = this._input[this._pos];
         this._pos++;
       } else {
-        var result230 = null;
+        var result228 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.AnyMatchFailure());
         }
       }
-      if (result230 !== null) {
-        var result228 = [result229, result230];
+      if (result228 !== null) {
+        var result226 = [result227, result228];
       } else {
-        var result228 = null;
-        this._pos = savedPos40;
+        var result226 = null;
+        this._pos = savedPos38;
       }
     } else {
-      var result228 = null;
-      this._pos = savedPos40;
+      var result226 = null;
+      this._pos = savedPos38;
     }
-    var result227 = result228 !== null
-      ? (function() {  return (arguments[1]);  }).apply(this, result228)
+    var result225 = result226 !== null
+      ? (function() {  return (arguments[1]);  }).apply(this, result226)
       : null;
     
     
     
     this._cache["simpleBracketDelimitedCharacter"][pos] = {
       nextPos: this._pos,
-      result:  result227
+      result:  result225
     };
-    return result227;
+    return result225;
   };
   
   result._parse_simpleEscapeSequence = function(context) {
@@ -2278,89 +2261,89 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos42 = this._pos;
+    var savedPos40 = this._pos;
     if (this._input.substr(this._pos, 1) === "\\") {
-      var result237 = "\\";
+      var result235 = "\\";
       this._pos += 1;
     } else {
-      var result237 = null;
+      var result235 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\"));
       }
     }
-    if (result237 !== null) {
-      var savedPos43 = this._pos;
-      var savedReportMatchFailuresVar5 = context.reportMatchFailures;
+    if (result235 !== null) {
+      var savedPos41 = this._pos;
+      var savedReportMatchFailuresVar4 = context.reportMatchFailures;
       context.reportMatchFailures = false;
-      var result244 = this._parse_digit(context);
-      if (result244 !== null) {
-        var result240 = result244;
+      var result242 = this._parse_digit(context);
+      if (result242 !== null) {
+        var result238 = result242;
       } else {
         if (this._input.substr(this._pos, 1) === "x") {
-          var result243 = "x";
+          var result241 = "x";
           this._pos += 1;
         } else {
-          var result243 = null;
+          var result241 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("x"));
           }
         }
-        if (result243 !== null) {
-          var result240 = result243;
+        if (result241 !== null) {
+          var result238 = result241;
         } else {
           if (this._input.substr(this._pos, 1) === "u") {
-            var result242 = "u";
+            var result240 = "u";
             this._pos += 1;
           } else {
-            var result242 = null;
+            var result240 = null;
             if (context.reportMatchFailures) {
               this._matchFailed(new PEG.Parser.LiteralMatchFailure("u"));
             }
           }
-          if (result242 !== null) {
-            var result240 = result242;
+          if (result240 !== null) {
+            var result238 = result240;
           } else {
-            var result241 = this._parse_eolChar(context);
-            if (result241 !== null) {
-              var result240 = result241;
+            var result239 = this._parse_eolChar(context);
+            if (result239 !== null) {
+              var result238 = result239;
             } else {
-              var result240 = null;;
+              var result238 = null;;
             };
           };
         };
       }
-      context.reportMatchFailures = savedReportMatchFailuresVar5;
-      if (result240 === null) {
-        var result238 = '';
+      context.reportMatchFailures = savedReportMatchFailuresVar4;
+      if (result238 === null) {
+        var result236 = '';
       } else {
-        var result238 = null;
-        this._pos = savedPos43;
+        var result236 = null;
+        this._pos = savedPos41;
       }
-      if (result238 !== null) {
+      if (result236 !== null) {
         if (this._input.length > this._pos) {
-          var result239 = this._input[this._pos];
+          var result237 = this._input[this._pos];
           this._pos++;
         } else {
-          var result239 = null;
+          var result237 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.AnyMatchFailure());
           }
         }
-        if (result239 !== null) {
-          var result236 = [result237, result238, result239];
+        if (result237 !== null) {
+          var result234 = [result235, result236, result237];
         } else {
-          var result236 = null;
-          this._pos = savedPos42;
+          var result234 = null;
+          this._pos = savedPos40;
         }
       } else {
-        var result236 = null;
-        this._pos = savedPos42;
+        var result234 = null;
+        this._pos = savedPos40;
       }
     } else {
-      var result236 = null;
-      this._pos = savedPos42;
+      var result234 = null;
+      this._pos = savedPos40;
     }
-    var result235 = result236 !== null
+    var result233 = result234 !== null
       ? (function() { 
         return (arguments[2])
           .replace("b", "\b")
@@ -2369,16 +2352,16 @@ PEG.grammarParser = (function(){
           .replace("r", "\r")
           .replace("t", "\t")
           .replace("v", "\v")
-       }).apply(this, result236)
+       }).apply(this, result234)
       : null;
     
     
     
     this._cache["simpleEscapeSequence"][pos] = {
       nextPos: this._pos,
-      result:  result235
+      result:  result233
     };
-    return result235;
+    return result233;
   };
   
   result._parse_zeroEscapeSequence = function(context) {
@@ -2392,49 +2375,49 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos44 = this._pos;
+    var savedPos42 = this._pos;
     if (this._input.substr(this._pos, 2) === "\\0") {
-      var result247 = "\\0";
+      var result245 = "\\0";
       this._pos += 2;
     } else {
-      var result247 = null;
+      var result245 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\0"));
       }
     }
-    if (result247 !== null) {
-      var savedPos45 = this._pos;
-      var savedReportMatchFailuresVar6 = context.reportMatchFailures;
+    if (result245 !== null) {
+      var savedPos43 = this._pos;
+      var savedReportMatchFailuresVar5 = context.reportMatchFailures;
       context.reportMatchFailures = false;
-      var result249 = this._parse_digit(context);
-      context.reportMatchFailures = savedReportMatchFailuresVar6;
-      if (result249 === null) {
-        var result248 = '';
+      var result247 = this._parse_digit(context);
+      context.reportMatchFailures = savedReportMatchFailuresVar5;
+      if (result247 === null) {
+        var result246 = '';
       } else {
-        var result248 = null;
-        this._pos = savedPos45;
+        var result246 = null;
+        this._pos = savedPos43;
       }
-      if (result248 !== null) {
-        var result246 = [result247, result248];
+      if (result246 !== null) {
+        var result244 = [result245, result246];
       } else {
-        var result246 = null;
-        this._pos = savedPos44;
+        var result244 = null;
+        this._pos = savedPos42;
       }
     } else {
-      var result246 = null;
-      this._pos = savedPos44;
+      var result244 = null;
+      this._pos = savedPos42;
     }
-    var result245 = result246 !== null
-      ? (function() {  return "\0";  }).apply(this, result246)
+    var result243 = result244 !== null
+      ? (function() {  return "\0";  }).apply(this, result244)
       : null;
     
     
     
     this._cache["zeroEscapeSequence"][pos] = {
       nextPos: this._pos,
-      result:  result245
+      result:  result243
     };
-    return result245;
+    return result243;
   };
   
   result._parse_hexEscapeSequence = function(context) {
@@ -2448,47 +2431,47 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos46 = this._pos;
+    var savedPos44 = this._pos;
     if (this._input.substr(this._pos, 2) === "\\x") {
-      var result252 = "\\x";
+      var result250 = "\\x";
       this._pos += 2;
     } else {
-      var result252 = null;
+      var result250 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\x"));
       }
     }
-    if (result252 !== null) {
-      var result253 = this._parse_hexDigit(context);
-      if (result253 !== null) {
-        var result254 = this._parse_hexDigit(context);
-        if (result254 !== null) {
-          var result251 = [result252, result253, result254];
+    if (result250 !== null) {
+      var result251 = this._parse_hexDigit(context);
+      if (result251 !== null) {
+        var result252 = this._parse_hexDigit(context);
+        if (result252 !== null) {
+          var result249 = [result250, result251, result252];
         } else {
-          var result251 = null;
-          this._pos = savedPos46;
+          var result249 = null;
+          this._pos = savedPos44;
         }
       } else {
-        var result251 = null;
-        this._pos = savedPos46;
+        var result249 = null;
+        this._pos = savedPos44;
       }
     } else {
-      var result251 = null;
-      this._pos = savedPos46;
+      var result249 = null;
+      this._pos = savedPos44;
     }
-    var result250 = result251 !== null
+    var result248 = result249 !== null
       ? (function() { 
         return String.fromCharCode(parseInt("0x" + (arguments[1]) + (arguments[2])));
-       }).apply(this, result251)
+       }).apply(this, result249)
       : null;
     
     
     
     this._cache["hexEscapeSequence"][pos] = {
       nextPos: this._pos,
-      result:  result250
+      result:  result248
     };
-    return result250;
+    return result248;
   };
   
   result._parse_unicodeEscapeSequence = function(context) {
@@ -2502,59 +2485,59 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos47 = this._pos;
+    var savedPos45 = this._pos;
     if (this._input.substr(this._pos, 2) === "\\u") {
-      var result257 = "\\u";
+      var result255 = "\\u";
       this._pos += 2;
     } else {
-      var result257 = null;
+      var result255 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\u"));
       }
     }
-    if (result257 !== null) {
-      var result258 = this._parse_hexDigit(context);
-      if (result258 !== null) {
-        var result259 = this._parse_hexDigit(context);
-        if (result259 !== null) {
-          var result260 = this._parse_hexDigit(context);
-          if (result260 !== null) {
-            var result261 = this._parse_hexDigit(context);
-            if (result261 !== null) {
-              var result256 = [result257, result258, result259, result260, result261];
+    if (result255 !== null) {
+      var result256 = this._parse_hexDigit(context);
+      if (result256 !== null) {
+        var result257 = this._parse_hexDigit(context);
+        if (result257 !== null) {
+          var result258 = this._parse_hexDigit(context);
+          if (result258 !== null) {
+            var result259 = this._parse_hexDigit(context);
+            if (result259 !== null) {
+              var result254 = [result255, result256, result257, result258, result259];
             } else {
-              var result256 = null;
-              this._pos = savedPos47;
+              var result254 = null;
+              this._pos = savedPos45;
             }
           } else {
-            var result256 = null;
-            this._pos = savedPos47;
+            var result254 = null;
+            this._pos = savedPos45;
           }
         } else {
-          var result256 = null;
-          this._pos = savedPos47;
+          var result254 = null;
+          this._pos = savedPos45;
         }
       } else {
-        var result256 = null;
-        this._pos = savedPos47;
+        var result254 = null;
+        this._pos = savedPos45;
       }
     } else {
-      var result256 = null;
-      this._pos = savedPos47;
+      var result254 = null;
+      this._pos = savedPos45;
     }
-    var result255 = result256 !== null
+    var result253 = result254 !== null
       ? (function() { 
         return String.fromCharCode(parseInt("0x" + (arguments[1]) + (arguments[2]) + (arguments[3]) + (arguments[4])));
-       }).apply(this, result256)
+       }).apply(this, result254)
       : null;
     
     
     
     this._cache["unicodeEscapeSequence"][pos] = {
       nextPos: this._pos,
-      result:  result255
+      result:  result253
     };
-    return result255;
+    return result253;
   };
   
   result._parse_eolEscapeSequence = function(context) {
@@ -2568,39 +2551,39 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos48 = this._pos;
+    var savedPos46 = this._pos;
     if (this._input.substr(this._pos, 1) === "\\") {
-      var result264 = "\\";
+      var result262 = "\\";
       this._pos += 1;
     } else {
-      var result264 = null;
+      var result262 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\\"));
       }
     }
-    if (result264 !== null) {
-      var result265 = this._parse_eol(context);
-      if (result265 !== null) {
-        var result263 = [result264, result265];
+    if (result262 !== null) {
+      var result263 = this._parse_eol(context);
+      if (result263 !== null) {
+        var result261 = [result262, result263];
       } else {
-        var result263 = null;
-        this._pos = savedPos48;
+        var result261 = null;
+        this._pos = savedPos46;
       }
     } else {
-      var result263 = null;
-      this._pos = savedPos48;
+      var result261 = null;
+      this._pos = savedPos46;
     }
-    var result262 = result263 !== null
-      ? (function() {  return (arguments[1]);  }).apply(this, result263)
+    var result260 = result261 !== null
+      ? (function() {  return (arguments[1]);  }).apply(this, result261)
       : null;
     
     
     
     this._cache["eolEscapeSequence"][pos] = {
       nextPos: this._pos,
-      result:  result262
+      result:  result260
     };
-    return result262;
+    return result260;
   };
   
   result._parse_digit = function(context) {
@@ -2615,10 +2598,10 @@ PEG.grammarParser = (function(){
     
     
     if (this._input.substr(this._pos).match(/^[0-9]/) !== null) {
-      var result266 = this._input[this._pos];
+      var result264 = this._input[this._pos];
       this._pos++;
     } else {
-      var result266 = null;
+      var result264 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.ClassMatchFailure("0-9"));
       }
@@ -2628,9 +2611,9 @@ PEG.grammarParser = (function(){
     
     this._cache["digit"][pos] = {
       nextPos: this._pos,
-      result:  result266
+      result:  result264
     };
-    return result266;
+    return result264;
   };
   
   result._parse_hexDigit = function(context) {
@@ -2645,10 +2628,10 @@ PEG.grammarParser = (function(){
     
     
     if (this._input.substr(this._pos).match(/^[0-9a-fA-F]/) !== null) {
-      var result267 = this._input[this._pos];
+      var result265 = this._input[this._pos];
       this._pos++;
     } else {
-      var result267 = null;
+      var result265 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.ClassMatchFailure("0-9a-fA-F"));
       }
@@ -2658,9 +2641,9 @@ PEG.grammarParser = (function(){
     
     this._cache["hexDigit"][pos] = {
       nextPos: this._pos,
-      result:  result267
+      result:  result265
     };
-    return result267;
+    return result265;
   };
   
   result._parse_letter = function(context) {
@@ -2674,15 +2657,15 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var result270 = this._parse_lowerCaseLetter(context);
-    if (result270 !== null) {
-      var result268 = result270;
+    var result268 = this._parse_lowerCaseLetter(context);
+    if (result268 !== null) {
+      var result266 = result268;
     } else {
-      var result269 = this._parse_upperCaseLetter(context);
-      if (result269 !== null) {
-        var result268 = result269;
+      var result267 = this._parse_upperCaseLetter(context);
+      if (result267 !== null) {
+        var result266 = result267;
       } else {
-        var result268 = null;;
+        var result266 = null;;
       };
     }
     
@@ -2690,9 +2673,9 @@ PEG.grammarParser = (function(){
     
     this._cache["letter"][pos] = {
       nextPos: this._pos,
-      result:  result268
+      result:  result266
     };
-    return result268;
+    return result266;
   };
   
   result._parse_lowerCaseLetter = function(context) {
@@ -2707,10 +2690,10 @@ PEG.grammarParser = (function(){
     
     
     if (this._input.substr(this._pos).match(/^[a-z]/) !== null) {
-      var result271 = this._input[this._pos];
+      var result269 = this._input[this._pos];
       this._pos++;
     } else {
-      var result271 = null;
+      var result269 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.ClassMatchFailure("a-z"));
       }
@@ -2720,9 +2703,9 @@ PEG.grammarParser = (function(){
     
     this._cache["lowerCaseLetter"][pos] = {
       nextPos: this._pos,
-      result:  result271
+      result:  result269
     };
-    return result271;
+    return result269;
   };
   
   result._parse_upperCaseLetter = function(context) {
@@ -2737,10 +2720,10 @@ PEG.grammarParser = (function(){
     
     
     if (this._input.substr(this._pos).match(/^[A-Z]/) !== null) {
-      var result272 = this._input[this._pos];
+      var result270 = this._input[this._pos];
       this._pos++;
     } else {
-      var result272 = null;
+      var result270 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.ClassMatchFailure("A-Z"));
       }
@@ -2750,9 +2733,9 @@ PEG.grammarParser = (function(){
     
     this._cache["upperCaseLetter"][pos] = {
       nextPos: this._pos,
-      result:  result272
+      result:  result270
     };
-    return result272;
+    return result270;
   };
   
   result._parse___ = function(context) {
@@ -2766,38 +2749,38 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var result273 = [];
-    var result277 = this._parse_whitespace(context);
-    if (result277 !== null) {
-      var result274 = result277;
+    var result271 = [];
+    var result275 = this._parse_whitespace(context);
+    if (result275 !== null) {
+      var result272 = result275;
     } else {
-      var result276 = this._parse_eol(context);
-      if (result276 !== null) {
-        var result274 = result276;
+      var result274 = this._parse_eol(context);
+      if (result274 !== null) {
+        var result272 = result274;
       } else {
-        var result275 = this._parse_comment(context);
-        if (result275 !== null) {
-          var result274 = result275;
+        var result273 = this._parse_comment(context);
+        if (result273 !== null) {
+          var result272 = result273;
         } else {
-          var result274 = null;;
+          var result272 = null;;
         };
       };
     }
-    while (result274 !== null) {
-      result273.push(result274);
-      var result277 = this._parse_whitespace(context);
-      if (result277 !== null) {
-        var result274 = result277;
+    while (result272 !== null) {
+      result271.push(result272);
+      var result275 = this._parse_whitespace(context);
+      if (result275 !== null) {
+        var result272 = result275;
       } else {
-        var result276 = this._parse_eol(context);
-        if (result276 !== null) {
-          var result274 = result276;
+        var result274 = this._parse_eol(context);
+        if (result274 !== null) {
+          var result272 = result274;
         } else {
-          var result275 = this._parse_comment(context);
-          if (result275 !== null) {
-            var result274 = result275;
+          var result273 = this._parse_comment(context);
+          if (result273 !== null) {
+            var result272 = result273;
           } else {
-            var result274 = null;;
+            var result272 = null;;
           };
         };
       }
@@ -2807,9 +2790,9 @@ PEG.grammarParser = (function(){
     
     this._cache["__"][pos] = {
       nextPos: this._pos,
-      result:  result273
+      result:  result271
     };
-    return result273;
+    return result271;
   };
   
   result._parse_comment = function(context) {
@@ -2824,27 +2807,27 @@ PEG.grammarParser = (function(){
     
     var savedReportMatchFailures = context.reportMatchFailures;
     context.reportMatchFailures = false;
-    var result280 = this._parse_singleLineComment(context);
-    if (result280 !== null) {
-      var result278 = result280;
+    var result278 = this._parse_singleLineComment(context);
+    if (result278 !== null) {
+      var result276 = result278;
     } else {
-      var result279 = this._parse_multiLineComment(context);
-      if (result279 !== null) {
-        var result278 = result279;
+      var result277 = this._parse_multiLineComment(context);
+      if (result277 !== null) {
+        var result276 = result277;
       } else {
-        var result278 = null;;
+        var result276 = null;;
       };
     }
     context.reportMatchFailures = savedReportMatchFailures;
-    if (context.reportMatchFailures && result278 === null) {
+    if (context.reportMatchFailures && result276 === null) {
       this._matchFailed(new PEG.Parser.NamedRuleMatchFailure("comment"));
     }
     
     this._cache["comment"][pos] = {
       nextPos: this._pos,
-      result:  result278
+      result:  result276
     };
-    return result278;
+    return result276;
   };
   
   result._parse_singleLineComment = function(context) {
@@ -2858,103 +2841,103 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos49 = this._pos;
+    var savedPos47 = this._pos;
     if (this._input.substr(this._pos, 2) === "//") {
-      var result282 = "//";
+      var result280 = "//";
       this._pos += 2;
     } else {
-      var result282 = null;
+      var result280 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("//"));
       }
     }
-    if (result282 !== null) {
-      var result283 = [];
-      var savedPos50 = this._pos;
-      var savedPos51 = this._pos;
-      var savedReportMatchFailuresVar7 = context.reportMatchFailures;
+    if (result280 !== null) {
+      var result281 = [];
+      var savedPos48 = this._pos;
+      var savedPos49 = this._pos;
+      var savedReportMatchFailuresVar6 = context.reportMatchFailures;
       context.reportMatchFailures = false;
-      var result287 = this._parse_eolChar(context);
-      context.reportMatchFailures = savedReportMatchFailuresVar7;
-      if (result287 === null) {
-        var result285 = '';
+      var result285 = this._parse_eolChar(context);
+      context.reportMatchFailures = savedReportMatchFailuresVar6;
+      if (result285 === null) {
+        var result283 = '';
       } else {
-        var result285 = null;
-        this._pos = savedPos51;
+        var result283 = null;
+        this._pos = savedPos49;
       }
-      if (result285 !== null) {
+      if (result283 !== null) {
         if (this._input.length > this._pos) {
-          var result286 = this._input[this._pos];
+          var result284 = this._input[this._pos];
           this._pos++;
         } else {
-          var result286 = null;
+          var result284 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.AnyMatchFailure());
           }
         }
-        if (result286 !== null) {
-          var result284 = [result285, result286];
+        if (result284 !== null) {
+          var result282 = [result283, result284];
         } else {
-          var result284 = null;
-          this._pos = savedPos50;
+          var result282 = null;
+          this._pos = savedPos48;
         }
       } else {
-        var result284 = null;
-        this._pos = savedPos50;
+        var result282 = null;
+        this._pos = savedPos48;
       }
-      while (result284 !== null) {
-        result283.push(result284);
-        var savedPos50 = this._pos;
-        var savedPos51 = this._pos;
-        var savedReportMatchFailuresVar7 = context.reportMatchFailures;
+      while (result282 !== null) {
+        result281.push(result282);
+        var savedPos48 = this._pos;
+        var savedPos49 = this._pos;
+        var savedReportMatchFailuresVar6 = context.reportMatchFailures;
         context.reportMatchFailures = false;
-        var result287 = this._parse_eolChar(context);
-        context.reportMatchFailures = savedReportMatchFailuresVar7;
-        if (result287 === null) {
-          var result285 = '';
+        var result285 = this._parse_eolChar(context);
+        context.reportMatchFailures = savedReportMatchFailuresVar6;
+        if (result285 === null) {
+          var result283 = '';
         } else {
-          var result285 = null;
-          this._pos = savedPos51;
+          var result283 = null;
+          this._pos = savedPos49;
         }
-        if (result285 !== null) {
+        if (result283 !== null) {
           if (this._input.length > this._pos) {
-            var result286 = this._input[this._pos];
+            var result284 = this._input[this._pos];
             this._pos++;
           } else {
-            var result286 = null;
+            var result284 = null;
             if (context.reportMatchFailures) {
               this._matchFailed(new PEG.Parser.AnyMatchFailure());
             }
           }
-          if (result286 !== null) {
-            var result284 = [result285, result286];
+          if (result284 !== null) {
+            var result282 = [result283, result284];
           } else {
-            var result284 = null;
-            this._pos = savedPos50;
+            var result282 = null;
+            this._pos = savedPos48;
           }
         } else {
-          var result284 = null;
-          this._pos = savedPos50;
+          var result282 = null;
+          this._pos = savedPos48;
         }
       }
-      if (result283 !== null) {
-        var result281 = [result282, result283];
+      if (result281 !== null) {
+        var result279 = [result280, result281];
       } else {
-        var result281 = null;
-        this._pos = savedPos49;
+        var result279 = null;
+        this._pos = savedPos47;
       }
     } else {
-      var result281 = null;
-      this._pos = savedPos49;
+      var result279 = null;
+      this._pos = savedPos47;
     }
     
     
     
     this._cache["singleLineComment"][pos] = {
       nextPos: this._pos,
-      result:  result281
+      result:  result279
     };
-    return result281;
+    return result279;
   };
   
   result._parse_multiLineComment = function(context) {
@@ -2968,133 +2951,133 @@ PEG.grammarParser = (function(){
     var pos = this._pos;
     
     
-    var savedPos52 = this._pos;
+    var savedPos50 = this._pos;
     if (this._input.substr(this._pos, 2) === "/*") {
-      var result289 = "/*";
+      var result287 = "/*";
       this._pos += 2;
     } else {
-      var result289 = null;
+      var result287 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("/*"));
       }
     }
-    if (result289 !== null) {
-      var result290 = [];
-      var savedPos53 = this._pos;
-      var savedPos54 = this._pos;
-      var savedReportMatchFailuresVar8 = context.reportMatchFailures;
+    if (result287 !== null) {
+      var result288 = [];
+      var savedPos51 = this._pos;
+      var savedPos52 = this._pos;
+      var savedReportMatchFailuresVar7 = context.reportMatchFailures;
       context.reportMatchFailures = false;
       if (this._input.substr(this._pos, 2) === "*/") {
-        var result295 = "*/";
+        var result293 = "*/";
         this._pos += 2;
       } else {
-        var result295 = null;
+        var result293 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("*/"));
         }
       }
-      context.reportMatchFailures = savedReportMatchFailuresVar8;
-      if (result295 === null) {
-        var result293 = '';
+      context.reportMatchFailures = savedReportMatchFailuresVar7;
+      if (result293 === null) {
+        var result291 = '';
       } else {
-        var result293 = null;
-        this._pos = savedPos54;
+        var result291 = null;
+        this._pos = savedPos52;
       }
-      if (result293 !== null) {
+      if (result291 !== null) {
         if (this._input.length > this._pos) {
-          var result294 = this._input[this._pos];
+          var result292 = this._input[this._pos];
           this._pos++;
         } else {
-          var result294 = null;
+          var result292 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.AnyMatchFailure());
           }
         }
-        if (result294 !== null) {
-          var result292 = [result293, result294];
+        if (result292 !== null) {
+          var result290 = [result291, result292];
         } else {
-          var result292 = null;
-          this._pos = savedPos53;
+          var result290 = null;
+          this._pos = savedPos51;
         }
       } else {
-        var result292 = null;
-        this._pos = savedPos53;
+        var result290 = null;
+        this._pos = savedPos51;
       }
-      while (result292 !== null) {
-        result290.push(result292);
-        var savedPos53 = this._pos;
-        var savedPos54 = this._pos;
-        var savedReportMatchFailuresVar8 = context.reportMatchFailures;
+      while (result290 !== null) {
+        result288.push(result290);
+        var savedPos51 = this._pos;
+        var savedPos52 = this._pos;
+        var savedReportMatchFailuresVar7 = context.reportMatchFailures;
         context.reportMatchFailures = false;
         if (this._input.substr(this._pos, 2) === "*/") {
-          var result295 = "*/";
+          var result293 = "*/";
           this._pos += 2;
         } else {
-          var result295 = null;
+          var result293 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("*/"));
           }
         }
-        context.reportMatchFailures = savedReportMatchFailuresVar8;
-        if (result295 === null) {
-          var result293 = '';
+        context.reportMatchFailures = savedReportMatchFailuresVar7;
+        if (result293 === null) {
+          var result291 = '';
         } else {
-          var result293 = null;
-          this._pos = savedPos54;
+          var result291 = null;
+          this._pos = savedPos52;
         }
-        if (result293 !== null) {
+        if (result291 !== null) {
           if (this._input.length > this._pos) {
-            var result294 = this._input[this._pos];
+            var result292 = this._input[this._pos];
             this._pos++;
           } else {
-            var result294 = null;
+            var result292 = null;
             if (context.reportMatchFailures) {
               this._matchFailed(new PEG.Parser.AnyMatchFailure());
             }
           }
-          if (result294 !== null) {
-            var result292 = [result293, result294];
+          if (result292 !== null) {
+            var result290 = [result291, result292];
           } else {
-            var result292 = null;
-            this._pos = savedPos53;
+            var result290 = null;
+            this._pos = savedPos51;
           }
         } else {
-          var result292 = null;
-          this._pos = savedPos53;
+          var result290 = null;
+          this._pos = savedPos51;
         }
       }
-      if (result290 !== null) {
+      if (result288 !== null) {
         if (this._input.substr(this._pos, 2) === "*/") {
-          var result291 = "*/";
+          var result289 = "*/";
           this._pos += 2;
         } else {
-          var result291 = null;
+          var result289 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("*/"));
           }
         }
-        if (result291 !== null) {
-          var result288 = [result289, result290, result291];
+        if (result289 !== null) {
+          var result286 = [result287, result288, result289];
         } else {
-          var result288 = null;
-          this._pos = savedPos52;
+          var result286 = null;
+          this._pos = savedPos50;
         }
       } else {
-        var result288 = null;
-        this._pos = savedPos52;
+        var result286 = null;
+        this._pos = savedPos50;
       }
     } else {
-      var result288 = null;
-      this._pos = savedPos52;
+      var result286 = null;
+      this._pos = savedPos50;
     }
     
     
     
     this._cache["multiLineComment"][pos] = {
       nextPos: this._pos,
-      result:  result288
+      result:  result286
     };
-    return result288;
+    return result286;
   };
   
   result._parse_eol = function(context) {
@@ -3110,81 +3093,81 @@ PEG.grammarParser = (function(){
     var savedReportMatchFailures = context.reportMatchFailures;
     context.reportMatchFailures = false;
     if (this._input.substr(this._pos, 1) === "\n") {
-      var result301 = "\n";
+      var result299 = "\n";
       this._pos += 1;
     } else {
-      var result301 = null;
+      var result299 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.LiteralMatchFailure("\n"));
       }
     }
-    if (result301 !== null) {
-      var result296 = result301;
+    if (result299 !== null) {
+      var result294 = result299;
     } else {
       if (this._input.substr(this._pos, 2) === "\r\n") {
-        var result300 = "\r\n";
+        var result298 = "\r\n";
         this._pos += 2;
       } else {
-        var result300 = null;
+        var result298 = null;
         if (context.reportMatchFailures) {
           this._matchFailed(new PEG.Parser.LiteralMatchFailure("\r\n"));
         }
       }
-      if (result300 !== null) {
-        var result296 = result300;
+      if (result298 !== null) {
+        var result294 = result298;
       } else {
         if (this._input.substr(this._pos, 1) === "\r") {
-          var result299 = "\r";
+          var result297 = "\r";
           this._pos += 1;
         } else {
-          var result299 = null;
+          var result297 = null;
           if (context.reportMatchFailures) {
             this._matchFailed(new PEG.Parser.LiteralMatchFailure("\r"));
           }
         }
-        if (result299 !== null) {
-          var result296 = result299;
+        if (result297 !== null) {
+          var result294 = result297;
         } else {
           if (this._input.substr(this._pos, 1) === "\u2028") {
-            var result298 = "\u2028";
+            var result296 = "\u2028";
             this._pos += 1;
           } else {
-            var result298 = null;
+            var result296 = null;
             if (context.reportMatchFailures) {
               this._matchFailed(new PEG.Parser.LiteralMatchFailure("\u2028"));
             }
           }
-          if (result298 !== null) {
-            var result296 = result298;
+          if (result296 !== null) {
+            var result294 = result296;
           } else {
             if (this._input.substr(this._pos, 1) === "\u2029") {
-              var result297 = "\u2029";
+              var result295 = "\u2029";
               this._pos += 1;
             } else {
-              var result297 = null;
+              var result295 = null;
               if (context.reportMatchFailures) {
                 this._matchFailed(new PEG.Parser.LiteralMatchFailure("\u2029"));
               }
             }
-            if (result297 !== null) {
-              var result296 = result297;
+            if (result295 !== null) {
+              var result294 = result295;
             } else {
-              var result296 = null;;
+              var result294 = null;;
             };
           };
         };
       };
     }
     context.reportMatchFailures = savedReportMatchFailures;
-    if (context.reportMatchFailures && result296 === null) {
+    if (context.reportMatchFailures && result294 === null) {
       this._matchFailed(new PEG.Parser.NamedRuleMatchFailure("end of line"));
     }
     
     this._cache["eol"][pos] = {
       nextPos: this._pos,
-      result:  result296
+      result:  result294
     };
-    return result296;
+    return result294;
   };
   
   result._parse_eolChar = function(context) {
@@ -3199,10 +3182,10 @@ PEG.grammarParser = (function(){
     
     
     if (this._input.substr(this._pos).match(/^[\n\r\u2028\u2029]/) !== null) {
-      var result302 = this._input[this._pos];
+      var result300 = this._input[this._pos];
       this._pos++;
     } else {
-      var result302 = null;
+      var result300 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.ClassMatchFailure("\\n\\r\\u2028\\u2029"));
       }
@@ -3212,9 +3195,9 @@ PEG.grammarParser = (function(){
     
     this._cache["eolChar"][pos] = {
       nextPos: this._pos,
-      result:  result302
+      result:  result300
     };
-    return result302;
+    return result300;
   };
   
   result._parse_whitespace = function(context) {
@@ -3230,24 +3213,24 @@ PEG.grammarParser = (function(){
     var savedReportMatchFailures = context.reportMatchFailures;
     context.reportMatchFailures = false;
     if (this._input.substr(this._pos).match(/^[ 	  ᠎ -   　]/) !== null) {
-      var result303 = this._input[this._pos];
+      var result301 = this._input[this._pos];
       this._pos++;
     } else {
-      var result303 = null;
+      var result301 = null;
       if (context.reportMatchFailures) {
         this._matchFailed(new PEG.Parser.ClassMatchFailure(" 	  ᠎ -   　"));
       }
     }
     context.reportMatchFailures = savedReportMatchFailures;
-    if (context.reportMatchFailures && result303 === null) {
+    if (context.reportMatchFailures && result301 === null) {
       this._matchFailed(new PEG.Parser.NamedRuleMatchFailure("whitespace"));
     }
     
     this._cache["whitespace"][pos] = {
       nextPos: this._pos,
-      result:  result303
+      result:  result301
     };
-    return result303;
+    return result301;
   };
   
   return result;
diff --git a/lib/metagrammar.pegjs b/lib/metagrammar.pegjs
index c39a388..0200c77 100644
--- a/lib/metagrammar.pegjs
+++ b/lib/metagrammar.pegjs
@@ -63,7 +63,7 @@ braced: "{" (braced / nonBraceCharacter)* "}" { return $1 + $2.join("") + $3; }
 
 nonBraceCharacters: nonBraceCharacter+ { return $1.join(""); }
 
-nonBraceCharacter: !("{" / "}") . { return $2; }
+nonBraceCharacter: [^{}] { return $1; }
 
 colon:    ":" __ { return $1; }
 slash:    "/" __ { return $1; }
@@ -125,8 +125,8 @@ singleQuotedCharacter
 
 simpleSingleQuotedCharacter: !("'" / "\\" / eolChar) . { return $2; }
 
-class "character class": "[" (classCharacterRange / classCharacter)* "]" __ {
-  return $2.join("");
+class "character class": "[" "^"? (classCharacterRange / classCharacter)* "]" __ {
+  return $2 + $3.join("");
 }
 
 classCharacterRange: bracketDelimitedCharacter "-" bracketDelimitedCharacter {
diff --git a/test/compiler-test.js b/test/compiler-test.js
index 990443a..cb03d2c 100644
--- a/test/compiler-test.js
+++ b/test/compiler-test.js
@@ -205,6 +205,19 @@ test("classes", function() {
   doesNotParse(nonEmptyClassParser, "");
   doesNotParse(nonEmptyClassParser, "ab");
 
+  var invertedEmptyClassParser = PEG.buildParser('start: []');
+  doesNotParse(invertedEmptyClassParser, "");
+  doesNotParse(invertedEmptyClassParser, "a");
+  doesNotParse(invertedEmptyClassParser, "ab");
+
+  var invertedNonEmptyClassParser = PEG.buildParser('start: [^ab-d]');
+  doesNotParse(invertedNonEmptyClassParser, "a", "a");
+  doesNotParse(invertedNonEmptyClassParser, "b", "b");
+  doesNotParse(invertedNonEmptyClassParser, "c", "c");
+  doesNotParse(invertedNonEmptyClassParser, "d", "d");
+  doesNotParse(invertedNonEmptyClassParser, "");
+  doesNotParse(invertedNonEmptyClassParser, "ab");
+
   /*
    * Test that the parsing position moves forward after successful parsing of
    * a class.
diff --git a/test/metagrammar-test.js b/test/metagrammar-test.js
index bb13a28..423ee6d 100644
--- a/test/metagrammar-test.js
+++ b/test/metagrammar-test.js
@@ -276,6 +276,7 @@ with (PEG.Grammar) {
   test("parses class", function() {
     grammarParserParses("start: []",          classGrammar(""));
     grammarParserParses("start: [a-d]",       classGrammar("a-d"));
+    grammarParserParses("start: [^a-d]",      classGrammar("^a-d"));
     grammarParserParses("start: [a]",         classGrammar("a"));
     grammarParserParses("start: [a-de-hi-l]", classGrammar("a-de-hi-l"));