From 66de889f4b715553ebe06cb841577fbe8b79495a Mon Sep 17 00:00:00 2001
From: David Majda <david@majda.cz>
Date: Tue, 8 Jun 2010 09:15:09 +0200
Subject: [PATCH] Implement initializers

---
 lib/compiler.js          |   43 +-
 lib/metagrammar.js       | 2437 +++++++++++++++++++-------------------
 lib/metagrammar.pegjs    |   20 +-
 test/compiler-test.js    |   12 +
 test/metagrammar-test.js |   46 +-
 5 files changed, 1341 insertions(+), 1217 deletions(-)

diff --git a/lib/compiler.js b/lib/compiler.js
index ec248e5..58abb5d 100644
--- a/lib/compiler.js
+++ b/lib/compiler.js
@@ -285,7 +285,7 @@ PEG.Compiler = {
 
         rule_ref:
           function(node) {
-            if (typeof(ast[node.name]) === "undefined") {
+            if (typeof(ast.rules[node.name]) === "undefined") {
               throw new PEG.GrammarError(
                 "Referenced rule \"" + node.name + "\" does not exist."
               );
@@ -299,14 +299,14 @@ PEG.Compiler = {
 
       function check(node) { checkFunctions[node.type](node); }
 
-      for (var rule in ast) {
-        check(ast[rule]);
+      for (var rule in ast.rules) {
+        check(ast.rules[rule]);
       }
     },
 
     /* Checks that the start rule is defined. */
     function(ast, startRule) {
-      if (typeof(ast[startRule]) === "undefined") {
+      if (typeof(ast.rules[startRule]) === "undefined") {
         throw new PEG.GrammarError(
           "Missing \"" + startRule + "\" rule."
         );
@@ -356,7 +356,7 @@ PEG.Compiler = {
                 "Left recursion detected for rule \"" + node.name + "\"."
               );
             }
-            check(ast[node.name], appliedRules);
+            check(ast.rules[node.name], appliedRules);
           },
 
         literal:       nop,
@@ -368,8 +368,8 @@ PEG.Compiler = {
         checkFunctions[node.type](node, appliedRules);
       }
 
-      for (var rule in ast) {
-        check(ast[rule], []);
+      for (var rule in ast.rules) {
+        check(ast.rules[rule], []);
       }
     }
   ],
@@ -432,18 +432,18 @@ PEG.Compiler = {
           replaceFunctions[node.type](node, from, to);
         }
 
-        for (var rule in ast) {
-          replace(ast[rule], from, to);
+        for (var rule in ast.rules) {
+          replace(ast.rules[rule], from, to);
         }
       }
 
-      for (var rule in ast) {
-        if (isProxyRule(ast[rule])) {
-          replaceRuleRefs(ast, ast[rule].name, ast[rule].expression.name);
+      for (var rule in ast.rules) {
+        if (isProxyRule(ast.rules[rule])) {
+          replaceRuleRefs(ast, ast.rules[rule].name, ast.rules[rule].expression.name);
           if (rule === startRule) {
-            startRule = ast[rule].expression.name;
+            startRule = ast.rules[rule].expression.name;
           }
-          delete ast[rule];
+          delete ast.rules[rule];
         }
       }
 
@@ -452,6 +452,10 @@ PEG.Compiler = {
   ],
 
   _compileFunctions: {
+    initializer: function(node) {
+      return node.code;
+    },
+
     rule: function(node) {
       var resultVar = PEG.Compiler.generateUniqueIdentifier("result");
 
@@ -871,9 +875,13 @@ PEG.Compiler = {
       startRule = newAstNadStartRule[1];
     }
 
+    var initializerCode = ast.initializer !== null
+      ?  this.compileNode(ast.initializer)
+      : "";
+
     var parseFunctionDefinitions = [];
-    for (var rule in ast) {
-      parseFunctionDefinitions.push(this.compileNode(ast[rule]));
+    for (var rule in ast.rules) {
+      parseFunctionDefinitions.push(this.compileNode(ast.rules[rule]));
     }
 
     var source = this.formatCode(
@@ -998,6 +1006,8 @@ PEG.Compiler = {
       "        return { line: line, column: column };",
       "      }",
       "      ",
+      "      ${initializerCode}",
+      "      ",
       "      var result = parse_${startRule}({ reportMatchFailures: true });",
       "      ",
       "      /*",
@@ -1054,6 +1064,7 @@ PEG.Compiler = {
       "  return result;",
       "})()",
       {
+        initializerCode:          initializerCode,
         parseFunctionDefinitions: parseFunctionDefinitions.join("\n\n"),
         startRule:                startRule
       }
diff --git a/lib/metagrammar.js b/lib/metagrammar.js
index c45a59e..ecabcd7 100644
--- a/lib/metagrammar.js
+++ b/lib/metagrammar.js
@@ -72,18 +72,25 @@ PEG.grammarParser = (function(){
         var savedPos0 = pos;
         var result2 = parse___(context);
         if (result2 !== null) {
-          var result4 = parse_rule(context);
-          if (result4 !== null) {
-            var result3 = [];
-            while (result4 !== null) {
-              result3.push(result4);
-              var result4 = parse_rule(context);
-            }
-          } else {
-            var result3 = null;
-          }
+          var result6 = parse_initializer(context);
+          var result3 = result6 !== null ? result6 : '';
           if (result3 !== null) {
-            var result1 = [result2, result3];
+            var result5 = parse_rule(context);
+            if (result5 !== null) {
+              var result4 = [];
+              while (result5 !== null) {
+                result4.push(result5);
+                var result5 = parse_rule(context);
+              }
+            } else {
+              var result4 = null;
+            }
+            if (result4 !== null) {
+              var result1 = [result2, result3, result4];
+            } else {
+              var result1 = null;
+              pos = savedPos0;
+            }
           } else {
             var result1 = null;
             pos = savedPos0;
@@ -93,11 +100,15 @@ PEG.grammarParser = (function(){
           pos = savedPos0;
         }
         var result0 = result1 !== null
-          ? (function(rules) {
-                var result = {};
-                PEG.ArrayUtils.each(rules, function(rule) { result[rule.name] = rule; });
-                return result;
-              })(result1[1])
+          ? (function(initializer, rules) {
+                var rulesConverted = {};
+                PEG.ArrayUtils.each(rules, function(rule) { rulesConverted[rule.name] = rule; });
+          
+                return {
+                  initializer: initializer !== "" ? initializer : null,
+                  rules:       rulesConverted
+                }
+              })(result1[1], result1[2])
           : null;
         
         
@@ -109,6 +120,48 @@ PEG.grammarParser = (function(){
         return result0;
       }
       
+      function parse_initializer(context) {
+        var cacheKey = "initializer" + '@' + pos;
+        var cachedResult = cache[cacheKey];
+        if (cachedResult) {
+          pos = cachedResult.nextPos;
+          return cachedResult.result;
+        }
+        
+        
+        var savedPos1 = pos;
+        var result9 = parse_action(context);
+        if (result9 !== null) {
+          var result11 = parse_semicolon(context);
+          var result10 = result11 !== null ? result11 : '';
+          if (result10 !== null) {
+            var result8 = [result9, result10];
+          } else {
+            var result8 = null;
+            pos = savedPos1;
+          }
+        } else {
+          var result8 = null;
+          pos = savedPos1;
+        }
+        var result7 = result8 !== null
+          ? (function(code) {
+                return {
+                  type: "initializer",
+                  code: code
+                };
+              })(result8[0])
+          : null;
+        
+        
+        
+        cache[cacheKey] = {
+          nextPos: pos,
+          result:  result7
+        };
+        return result7;
+      }
+      
       function parse_rule(context) {
         var cacheKey = "rule" + '@' + pos;
         var cachedResult = cache[cacheKey];
@@ -118,58 +171,58 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos1 = pos;
-        var result7 = parse_identifier(context);
-        if (result7 !== null) {
-          var result14 = parse_literal(context);
-          if (result14 !== null) {
-            var result8 = result14;
+        var savedPos2 = pos;
+        var result14 = parse_identifier(context);
+        if (result14 !== null) {
+          var result21 = parse_literal(context);
+          if (result21 !== null) {
+            var result15 = result21;
           } else {
             if (input.substr(pos, 0) === "") {
-              var result13 = "";
+              var result20 = "";
               pos += 0;
             } else {
-              var result13 = null;
+              var result20 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString(""));
               }
             }
-            if (result13 !== null) {
-              var result8 = result13;
+            if (result20 !== null) {
+              var result15 = result20;
             } else {
-              var result8 = null;;
+              var result15 = null;;
             };
           }
-          if (result8 !== null) {
-            var result9 = parse_equals(context);
-            if (result9 !== null) {
-              var result10 = parse_choice(context);
-              if (result10 !== null) {
-                var result12 = parse_semicolon(context);
-                var result11 = result12 !== null ? result12 : '';
-                if (result11 !== null) {
-                  var result6 = [result7, result8, result9, result10, result11];
+          if (result15 !== null) {
+            var result16 = parse_equals(context);
+            if (result16 !== null) {
+              var result17 = parse_choice(context);
+              if (result17 !== null) {
+                var result19 = parse_semicolon(context);
+                var result18 = result19 !== null ? result19 : '';
+                if (result18 !== null) {
+                  var result13 = [result14, result15, result16, result17, result18];
                 } else {
-                  var result6 = null;
-                  pos = savedPos1;
+                  var result13 = null;
+                  pos = savedPos2;
                 }
               } else {
-                var result6 = null;
-                pos = savedPos1;
+                var result13 = null;
+                pos = savedPos2;
               }
             } else {
-              var result6 = null;
-              pos = savedPos1;
+              var result13 = null;
+              pos = savedPos2;
             }
           } else {
-            var result6 = null;
-            pos = savedPos1;
+            var result13 = null;
+            pos = savedPos2;
           }
         } else {
-          var result6 = null;
-          pos = savedPos1;
+          var result13 = null;
+          pos = savedPos2;
         }
-        var result5 = result6 !== null
+        var result12 = result13 !== null
           ? (function(name, displayName, expression) {
                 return {
                   type:        "rule",
@@ -177,16 +230,16 @@ PEG.grammarParser = (function(){
                   displayName: displayName !== "" ? displayName : null,
                   expression:  expression
                 };
-              })(result6[0], result6[1], result6[3])
+              })(result13[0], result13[1], result13[3])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result5
+          result:  result12
         };
-        return result5;
+        return result12;
       }
       
       function parse_choice(context) {
@@ -198,52 +251,52 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos2 = pos;
-        var result17 = parse_sequence(context);
-        if (result17 !== null) {
-          var result18 = [];
-          var savedPos3 = pos;
-          var result20 = parse_slash(context);
-          if (result20 !== null) {
-            var result21 = parse_sequence(context);
-            if (result21 !== null) {
-              var result19 = [result20, result21];
+        var savedPos3 = pos;
+        var result24 = parse_sequence(context);
+        if (result24 !== null) {
+          var result25 = [];
+          var savedPos4 = pos;
+          var result27 = parse_slash(context);
+          if (result27 !== null) {
+            var result28 = parse_sequence(context);
+            if (result28 !== null) {
+              var result26 = [result27, result28];
             } else {
-              var result19 = null;
-              pos = savedPos3;
+              var result26 = null;
+              pos = savedPos4;
             }
           } else {
-            var result19 = null;
-            pos = savedPos3;
+            var result26 = null;
+            pos = savedPos4;
           }
-          while (result19 !== null) {
-            result18.push(result19);
-            var savedPos3 = pos;
-            var result20 = parse_slash(context);
-            if (result20 !== null) {
-              var result21 = parse_sequence(context);
-              if (result21 !== null) {
-                var result19 = [result20, result21];
+          while (result26 !== null) {
+            result25.push(result26);
+            var savedPos4 = pos;
+            var result27 = parse_slash(context);
+            if (result27 !== null) {
+              var result28 = parse_sequence(context);
+              if (result28 !== null) {
+                var result26 = [result27, result28];
               } else {
-                var result19 = null;
-                pos = savedPos3;
+                var result26 = null;
+                pos = savedPos4;
               }
             } else {
-              var result19 = null;
-              pos = savedPos3;
+              var result26 = null;
+              pos = savedPos4;
             }
           }
-          if (result18 !== null) {
-            var result16 = [result17, result18];
+          if (result25 !== null) {
+            var result23 = [result24, result25];
           } else {
-            var result16 = null;
-            pos = savedPos2;
+            var result23 = null;
+            pos = savedPos3;
           }
         } else {
-          var result16 = null;
-          pos = savedPos2;
+          var result23 = null;
+          pos = savedPos3;
         }
-        var result15 = result16 !== null
+        var result22 = result23 !== null
           ? (function(head, tail) {
                 if (tail.length > 0) {
                   var alternatives = [head].concat(PEG.ArrayUtils.map(
@@ -257,16 +310,16 @@ PEG.grammarParser = (function(){
                 } else {
                   return head;
                 }
-              })(result16[0], result16[1])
+              })(result23[0], result23[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result15
+          result:  result22
         };
-        return result15;
+        return result22;
       }
       
       function parse_sequence(context) {
@@ -278,26 +331,26 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos4 = pos;
-        var result28 = [];
-        var result30 = parse_labeled(context);
-        while (result30 !== null) {
-          result28.push(result30);
-          var result30 = parse_labeled(context);
+        var savedPos5 = pos;
+        var result35 = [];
+        var result37 = parse_labeled(context);
+        while (result37 !== null) {
+          result35.push(result37);
+          var result37 = parse_labeled(context);
         }
-        if (result28 !== null) {
-          var result29 = parse_action(context);
-          if (result29 !== null) {
-            var result27 = [result28, result29];
+        if (result35 !== null) {
+          var result36 = parse_action(context);
+          if (result36 !== null) {
+            var result34 = [result35, result36];
           } else {
-            var result27 = null;
-            pos = savedPos4;
+            var result34 = null;
+            pos = savedPos5;
           }
         } else {
-          var result27 = null;
-          pos = savedPos4;
+          var result34 = null;
+          pos = savedPos5;
         }
-        var result26 = result27 !== null
+        var result33 = result34 !== null
           ? (function(elements, code) {
                 var expression = elements.length != 1
                   ? {
@@ -310,18 +363,18 @@ PEG.grammarParser = (function(){
                   expression: expression,
                   code:       code
                 };
-              })(result27[0], result27[1])
+              })(result34[0], result34[1])
           : null;
-        if (result26 !== null) {
-          var result22 = result26;
+        if (result33 !== null) {
+          var result29 = result33;
         } else {
-          var result24 = [];
-          var result25 = parse_labeled(context);
-          while (result25 !== null) {
-            result24.push(result25);
-            var result25 = parse_labeled(context);
+          var result31 = [];
+          var result32 = parse_labeled(context);
+          while (result32 !== null) {
+            result31.push(result32);
+            var result32 = parse_labeled(context);
           }
-          var result23 = result24 !== null
+          var result30 = result31 !== null
             ? (function(elements) {
                   return elements.length != 1
                     ? {
@@ -329,12 +382,12 @@ PEG.grammarParser = (function(){
                         elements: elements
                       }
                     : elements[0];
-                })(result24)
+                })(result31)
             : null;
-          if (result23 !== null) {
-            var result22 = result23;
+          if (result30 !== null) {
+            var result29 = result30;
           } else {
-            var result22 = null;;
+            var result29 = null;;
           };
         }
         
@@ -342,9 +395,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result22
+          result:  result29
         };
-        return result22;
+        return result29;
       }
       
       function parse_labeled(context) {
@@ -356,43 +409,43 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos5 = pos;
-        var result35 = parse_identifier(context);
-        if (result35 !== null) {
-          var result36 = parse_colon(context);
-          if (result36 !== null) {
-            var result37 = parse_prefixed(context);
-            if (result37 !== null) {
-              var result34 = [result35, result36, result37];
+        var savedPos6 = pos;
+        var result42 = parse_identifier(context);
+        if (result42 !== null) {
+          var result43 = parse_colon(context);
+          if (result43 !== null) {
+            var result44 = parse_prefixed(context);
+            if (result44 !== null) {
+              var result41 = [result42, result43, result44];
             } else {
-              var result34 = null;
-              pos = savedPos5;
+              var result41 = null;
+              pos = savedPos6;
             }
           } else {
-            var result34 = null;
-            pos = savedPos5;
+            var result41 = null;
+            pos = savedPos6;
           }
         } else {
-          var result34 = null;
-          pos = savedPos5;
+          var result41 = null;
+          pos = savedPos6;
         }
-        var result33 = result34 !== null
+        var result40 = result41 !== null
           ? (function(label, expression) {
                 return {
                   type:       "labeled",
                   label:      label,
                   expression: expression
                 };
-              })(result34[0], result34[2])
+              })(result41[0], result41[2])
           : null;
-        if (result33 !== null) {
-          var result31 = result33;
+        if (result40 !== null) {
+          var result38 = result40;
         } else {
-          var result32 = parse_prefixed(context);
-          if (result32 !== null) {
-            var result31 = result32;
+          var result39 = parse_prefixed(context);
+          if (result39 !== null) {
+            var result38 = result39;
           } else {
-            var result31 = null;;
+            var result38 = null;;
           };
         }
         
@@ -400,9 +453,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result31
+          result:  result38
         };
-        return result31;
+        return result38;
       }
       
       function parse_prefixed(context) {
@@ -414,61 +467,61 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos7 = pos;
-        var result46 = parse_and(context);
-        if (result46 !== null) {
-          var result47 = parse_suffixed(context);
-          if (result47 !== null) {
-            var result45 = [result46, result47];
+        var savedPos8 = pos;
+        var result53 = parse_and(context);
+        if (result53 !== null) {
+          var result54 = parse_suffixed(context);
+          if (result54 !== null) {
+            var result52 = [result53, result54];
           } else {
-            var result45 = null;
-            pos = savedPos7;
+            var result52 = null;
+            pos = savedPos8;
           }
         } else {
-          var result45 = null;
-          pos = savedPos7;
+          var result52 = null;
+          pos = savedPos8;
         }
-        var result44 = result45 !== null
+        var result51 = result52 !== null
           ? (function(expression) {
                 return {
                   type:       "and_predicate",
                   expression: expression
                 };
-              })(result45[1])
+              })(result52[1])
           : null;
-        if (result44 !== null) {
-          var result38 = result44;
-        } else {
-          var savedPos6 = pos;
-          var result42 = parse_not(context);
-          if (result42 !== null) {
-            var result43 = parse_suffixed(context);
-            if (result43 !== null) {
-              var result41 = [result42, result43];
+        if (result51 !== null) {
+          var result45 = result51;
+        } else {
+          var savedPos7 = pos;
+          var result49 = parse_not(context);
+          if (result49 !== null) {
+            var result50 = parse_suffixed(context);
+            if (result50 !== null) {
+              var result48 = [result49, result50];
             } else {
-              var result41 = null;
-              pos = savedPos6;
+              var result48 = null;
+              pos = savedPos7;
             }
           } else {
-            var result41 = null;
-            pos = savedPos6;
+            var result48 = null;
+            pos = savedPos7;
           }
-          var result40 = result41 !== null
+          var result47 = result48 !== null
             ? (function(expression) {
                   return {
                     type:       "not_predicate",
                     expression: expression
                   };
-                })(result41[1])
+                })(result48[1])
             : null;
-          if (result40 !== null) {
-            var result38 = result40;
+          if (result47 !== null) {
+            var result45 = result47;
           } else {
-            var result39 = parse_suffixed(context);
-            if (result39 !== null) {
-              var result38 = result39;
+            var result46 = parse_suffixed(context);
+            if (result46 !== null) {
+              var result45 = result46;
             } else {
-              var result38 = null;;
+              var result45 = null;;
             };
           };
         }
@@ -477,9 +530,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result38
+          result:  result45
         };
-        return result38;
+        return result45;
       }
       
       function parse_suffixed(context) {
@@ -491,86 +544,86 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos10 = pos;
-        var result60 = parse_primary(context);
-        if (result60 !== null) {
-          var result61 = parse_question(context);
-          if (result61 !== null) {
-            var result59 = [result60, result61];
+        var savedPos11 = pos;
+        var result67 = parse_primary(context);
+        if (result67 !== null) {
+          var result68 = parse_question(context);
+          if (result68 !== null) {
+            var result66 = [result67, result68];
           } else {
-            var result59 = null;
-            pos = savedPos10;
+            var result66 = null;
+            pos = savedPos11;
           }
         } else {
-          var result59 = null;
-          pos = savedPos10;
+          var result66 = null;
+          pos = savedPos11;
         }
-        var result58 = result59 !== null
+        var result65 = result66 !== null
           ? (function(expression) {
                 return {
                   type:       "optional",
                   expression: expression
                 };
-              })(result59[0])
+              })(result66[0])
           : null;
-        if (result58 !== null) {
-          var result48 = result58;
-        } else {
-          var savedPos9 = pos;
-          var result56 = parse_primary(context);
-          if (result56 !== null) {
-            var result57 = parse_star(context);
-            if (result57 !== null) {
-              var result55 = [result56, result57];
+        if (result65 !== null) {
+          var result55 = result65;
+        } else {
+          var savedPos10 = pos;
+          var result63 = parse_primary(context);
+          if (result63 !== null) {
+            var result64 = parse_star(context);
+            if (result64 !== null) {
+              var result62 = [result63, result64];
             } else {
-              var result55 = null;
-              pos = savedPos9;
+              var result62 = null;
+              pos = savedPos10;
             }
           } else {
-            var result55 = null;
-            pos = savedPos9;
+            var result62 = null;
+            pos = savedPos10;
           }
-          var result54 = result55 !== null
+          var result61 = result62 !== null
             ? (function(expression) {
                   return {
                     type:       "zero_or_more",
                     expression: expression
                   };
-                })(result55[0])
+                })(result62[0])
             : null;
-          if (result54 !== null) {
-            var result48 = result54;
-          } else {
-            var savedPos8 = pos;
-            var result52 = parse_primary(context);
-            if (result52 !== null) {
-              var result53 = parse_plus(context);
-              if (result53 !== null) {
-                var result51 = [result52, result53];
+          if (result61 !== null) {
+            var result55 = result61;
+          } else {
+            var savedPos9 = pos;
+            var result59 = parse_primary(context);
+            if (result59 !== null) {
+              var result60 = parse_plus(context);
+              if (result60 !== null) {
+                var result58 = [result59, result60];
               } else {
-                var result51 = null;
-                pos = savedPos8;
+                var result58 = null;
+                pos = savedPos9;
               }
             } else {
-              var result51 = null;
-              pos = savedPos8;
+              var result58 = null;
+              pos = savedPos9;
             }
-            var result50 = result51 !== null
+            var result57 = result58 !== null
               ? (function(expression) {
                     return {
                       type:       "one_or_more",
                       expression: expression
                     };
-                  })(result51[0])
+                  })(result58[0])
               : null;
-            if (result50 !== null) {
-              var result48 = result50;
+            if (result57 !== null) {
+              var result55 = result57;
             } else {
-              var result49 = parse_primary(context);
-              if (result49 !== null) {
-                var result48 = result49;
+              var result56 = parse_primary(context);
+              if (result56 !== null) {
+                var result55 = result56;
               } else {
-                var result48 = null;;
+                var result55 = null;;
               };
             };
           };
@@ -580,9 +633,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result48
+          result:  result55
         };
-        return result48;
+        return result55;
       }
       
       function parse_primary(context) {
@@ -594,122 +647,122 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos12 = pos;
-        var result75 = parse_identifier(context);
-        if (result75 !== null) {
-          var savedPos13 = pos;
+        var savedPos13 = pos;
+        var result82 = parse_identifier(context);
+        if (result82 !== null) {
+          var savedPos14 = pos;
           var savedReportMatchFailuresVar0 = context.reportMatchFailures;
           context.reportMatchFailures = false;
-          var savedPos14 = pos;
-          var result81 = parse_literal(context);
-          if (result81 !== null) {
-            var result78 = result81;
+          var savedPos15 = pos;
+          var result88 = parse_literal(context);
+          if (result88 !== null) {
+            var result85 = result88;
           } else {
             if (input.substr(pos, 0) === "") {
-              var result80 = "";
+              var result87 = "";
               pos += 0;
             } else {
-              var result80 = null;
+              var result87 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString(""));
               }
             }
-            if (result80 !== null) {
-              var result78 = result80;
+            if (result87 !== null) {
+              var result85 = result87;
             } else {
-              var result78 = null;;
+              var result85 = null;;
             };
           }
-          if (result78 !== null) {
-            var result79 = parse_equals(context);
-            if (result79 !== null) {
-              var result77 = [result78, result79];
+          if (result85 !== null) {
+            var result86 = parse_equals(context);
+            if (result86 !== null) {
+              var result84 = [result85, result86];
             } else {
-              var result77 = null;
-              pos = savedPos14;
+              var result84 = null;
+              pos = savedPos15;
             }
           } else {
-            var result77 = null;
-            pos = savedPos14;
+            var result84 = null;
+            pos = savedPos15;
           }
           context.reportMatchFailures = savedReportMatchFailuresVar0;
-          if (result77 === null) {
-            var result76 = '';
+          if (result84 === null) {
+            var result83 = '';
           } else {
-            var result76 = null;
-            pos = savedPos13;
+            var result83 = null;
+            pos = savedPos14;
           }
-          if (result76 !== null) {
-            var result74 = [result75, result76];
+          if (result83 !== null) {
+            var result81 = [result82, result83];
           } else {
-            var result74 = null;
-            pos = savedPos12;
+            var result81 = null;
+            pos = savedPos13;
           }
         } else {
-          var result74 = null;
-          pos = savedPos12;
+          var result81 = null;
+          pos = savedPos13;
         }
-        var result73 = result74 !== null
+        var result80 = result81 !== null
           ? (function(name) {
                 return {
                   type: "rule_ref",
                   name: name
                 };
-              })(result74[0])
+              })(result81[0])
           : null;
-        if (result73 !== null) {
-          var result62 = result73;
+        if (result80 !== null) {
+          var result69 = result80;
         } else {
-          var result72 = parse_literal(context);
-          var result71 = result72 !== null
+          var result79 = parse_literal(context);
+          var result78 = result79 !== null
             ? (function(value) {
                   return {
                     type:  "literal",
                     value: value
                   };
-                })(result72)
+                })(result79)
             : null;
-          if (result71 !== null) {
-            var result62 = result71;
+          if (result78 !== null) {
+            var result69 = result78;
           } else {
-            var result70 = parse_dot(context);
-            var result69 = result70 !== null
+            var result77 = parse_dot(context);
+            var result76 = result77 !== null
               ? (function() { return { type: "any" }; })()
               : null;
-            if (result69 !== null) {
-              var result62 = result69;
+            if (result76 !== null) {
+              var result69 = result76;
             } else {
-              var result68 = parse_class(context);
-              if (result68 !== null) {
-                var result62 = result68;
+              var result75 = parse_class(context);
+              if (result75 !== null) {
+                var result69 = result75;
               } else {
-                var savedPos11 = pos;
-                var result65 = parse_lparen(context);
-                if (result65 !== null) {
-                  var result66 = parse_choice(context);
-                  if (result66 !== null) {
-                    var result67 = parse_rparen(context);
-                    if (result67 !== null) {
-                      var result64 = [result65, result66, result67];
+                var savedPos12 = pos;
+                var result72 = parse_lparen(context);
+                if (result72 !== null) {
+                  var result73 = parse_choice(context);
+                  if (result73 !== null) {
+                    var result74 = parse_rparen(context);
+                    if (result74 !== null) {
+                      var result71 = [result72, result73, result74];
                     } else {
-                      var result64 = null;
-                      pos = savedPos11;
+                      var result71 = null;
+                      pos = savedPos12;
                     }
                   } else {
-                    var result64 = null;
-                    pos = savedPos11;
+                    var result71 = null;
+                    pos = savedPos12;
                   }
                 } else {
-                  var result64 = null;
-                  pos = savedPos11;
+                  var result71 = null;
+                  pos = savedPos12;
                 }
-                var result63 = result64 !== null
-                  ? (function(expression) { return expression; })(result64[1])
+                var result70 = result71 !== null
+                  ? (function(expression) { return expression; })(result71[1])
                   : null;
-                if (result63 !== null) {
-                  var result62 = result63;
+                if (result70 !== null) {
+                  var result69 = result70;
                 } else {
-                  var result62 = null;;
+                  var result69 = null;;
                 };
               };
             };
@@ -720,9 +773,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result62
+          result:  result69
         };
-        return result62;
+        return result69;
       }
       
       function parse_action(context) {
@@ -735,33 +788,33 @@ PEG.grammarParser = (function(){
         
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
-        var savedPos15 = pos;
-        var result84 = parse_braced(context);
-        if (result84 !== null) {
-          var result85 = parse___(context);
-          if (result85 !== null) {
-            var result83 = [result84, result85];
+        var savedPos16 = pos;
+        var result91 = parse_braced(context);
+        if (result91 !== null) {
+          var result92 = parse___(context);
+          if (result92 !== null) {
+            var result90 = [result91, result92];
           } else {
-            var result83 = null;
-            pos = savedPos15;
+            var result90 = null;
+            pos = savedPos16;
           }
         } else {
-          var result83 = null;
-          pos = savedPos15;
+          var result90 = null;
+          pos = savedPos16;
         }
-        var result82 = result83 !== null
-          ? (function(braced) { return braced.substr(1, braced.length - 2); })(result83[0])
+        var result89 = result90 !== null
+          ? (function(braced) { return braced.substr(1, braced.length - 2); })(result90[0])
           : null;
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result82 === null) {
+        if (context.reportMatchFailures && result89 === null) {
           matchFailed("action");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result82
+          result:  result89
         };
-        return result82;
+        return result89;
       }
       
       function parse_braced(context) {
@@ -773,80 +826,80 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos16 = pos;
+        var savedPos17 = pos;
         if (input.substr(pos, 1) === "{") {
-          var result88 = "{";
+          var result95 = "{";
           pos += 1;
         } else {
-          var result88 = null;
+          var result95 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("{"));
           }
         }
-        if (result88 !== null) {
-          var result89 = [];
-          var result93 = parse_braced(context);
-          if (result93 !== null) {
-            var result91 = result93;
+        if (result95 !== null) {
+          var result96 = [];
+          var result100 = parse_braced(context);
+          if (result100 !== null) {
+            var result98 = result100;
           } else {
-            var result92 = parse_nonBraceCharacter(context);
-            if (result92 !== null) {
-              var result91 = result92;
+            var result99 = parse_nonBraceCharacter(context);
+            if (result99 !== null) {
+              var result98 = result99;
             } else {
-              var result91 = null;;
+              var result98 = null;;
             };
           }
-          while (result91 !== null) {
-            result89.push(result91);
-            var result93 = parse_braced(context);
-            if (result93 !== null) {
-              var result91 = result93;
+          while (result98 !== null) {
+            result96.push(result98);
+            var result100 = parse_braced(context);
+            if (result100 !== null) {
+              var result98 = result100;
             } else {
-              var result92 = parse_nonBraceCharacter(context);
-              if (result92 !== null) {
-                var result91 = result92;
+              var result99 = parse_nonBraceCharacter(context);
+              if (result99 !== null) {
+                var result98 = result99;
               } else {
-                var result91 = null;;
+                var result98 = null;;
               };
             }
           }
-          if (result89 !== null) {
+          if (result96 !== null) {
             if (input.substr(pos, 1) === "}") {
-              var result90 = "}";
+              var result97 = "}";
               pos += 1;
             } else {
-              var result90 = null;
+              var result97 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("}"));
               }
             }
-            if (result90 !== null) {
-              var result87 = [result88, result89, result90];
+            if (result97 !== null) {
+              var result94 = [result95, result96, result97];
             } else {
-              var result87 = null;
-              pos = savedPos16;
+              var result94 = null;
+              pos = savedPos17;
             }
           } else {
-            var result87 = null;
-            pos = savedPos16;
+            var result94 = null;
+            pos = savedPos17;
           }
         } else {
-          var result87 = null;
-          pos = savedPos16;
+          var result94 = null;
+          pos = savedPos17;
         }
-        var result86 = result87 !== null
+        var result93 = result94 !== null
           ? (function(parts) {
                 return "{" + parts.join("") + "}";
-              })(result87[1])
+              })(result94[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result86
+          result:  result93
         };
-        return result86;
+        return result93;
       }
       
       function parse_nonBraceCharacters(context) {
@@ -858,27 +911,27 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result96 = parse_nonBraceCharacter(context);
-        if (result96 !== null) {
-          var result95 = [];
-          while (result96 !== null) {
-            result95.push(result96);
-            var result96 = parse_nonBraceCharacter(context);
+        var result103 = parse_nonBraceCharacter(context);
+        if (result103 !== null) {
+          var result102 = [];
+          while (result103 !== null) {
+            result102.push(result103);
+            var result103 = parse_nonBraceCharacter(context);
           }
         } else {
-          var result95 = null;
+          var result102 = null;
         }
-        var result94 = result95 !== null
-          ? (function(chars) { return chars.join(""); })(result95)
+        var result101 = result102 !== null
+          ? (function(chars) { return chars.join(""); })(result102)
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result94
+          result:  result101
         };
-        return result94;
+        return result101;
       }
       
       function parse_nonBraceCharacter(context) {
@@ -891,10 +944,10 @@ PEG.grammarParser = (function(){
         
         
         if (input.substr(pos).match(/^[^{}]/) !== null) {
-          var result97 = input.charAt(pos);
+          var result104 = input.charAt(pos);
           pos++;
         } else {
-          var result97 = null;
+          var result104 = null;
           if (context.reportMatchFailures) {
             matchFailed("[^{}]");
           }
@@ -904,9 +957,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result97
+          result:  result104
         };
-        return result97;
+        return result104;
       }
       
       function parse_equals(context) {
@@ -918,29 +971,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos17 = pos;
+        var savedPos18 = pos;
         if (input.substr(pos, 1) === "=") {
-          var result100 = "=";
+          var result107 = "=";
           pos += 1;
         } else {
-          var result100 = null;
+          var result107 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("="));
           }
         }
-        if (result100 !== null) {
-          var result101 = parse___(context);
-          if (result101 !== null) {
-            var result99 = [result100, result101];
+        if (result107 !== null) {
+          var result108 = parse___(context);
+          if (result108 !== null) {
+            var result106 = [result107, result108];
           } else {
-            var result99 = null;
-            pos = savedPos17;
+            var result106 = null;
+            pos = savedPos18;
           }
         } else {
-          var result99 = null;
-          pos = savedPos17;
+          var result106 = null;
+          pos = savedPos18;
         }
-        var result98 = result99 !== null
+        var result105 = result106 !== null
           ? (function() { return "="; })()
           : null;
         
@@ -948,9 +1001,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result98
+          result:  result105
         };
-        return result98;
+        return result105;
       }
       
       function parse_colon(context) {
@@ -962,29 +1015,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos18 = pos;
+        var savedPos19 = pos;
         if (input.substr(pos, 1) === ":") {
-          var result104 = ":";
+          var result111 = ":";
           pos += 1;
         } else {
-          var result104 = null;
+          var result111 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString(":"));
           }
         }
-        if (result104 !== null) {
-          var result105 = parse___(context);
-          if (result105 !== null) {
-            var result103 = [result104, result105];
+        if (result111 !== null) {
+          var result112 = parse___(context);
+          if (result112 !== null) {
+            var result110 = [result111, result112];
           } else {
-            var result103 = null;
-            pos = savedPos18;
+            var result110 = null;
+            pos = savedPos19;
           }
         } else {
-          var result103 = null;
-          pos = savedPos18;
+          var result110 = null;
+          pos = savedPos19;
         }
-        var result102 = result103 !== null
+        var result109 = result110 !== null
           ? (function() { return ":"; })()
           : null;
         
@@ -992,9 +1045,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result102
+          result:  result109
         };
-        return result102;
+        return result109;
       }
       
       function parse_semicolon(context) {
@@ -1006,29 +1059,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos19 = pos;
+        var savedPos20 = pos;
         if (input.substr(pos, 1) === ";") {
-          var result108 = ";";
+          var result115 = ";";
           pos += 1;
         } else {
-          var result108 = null;
+          var result115 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString(";"));
           }
         }
-        if (result108 !== null) {
-          var result109 = parse___(context);
-          if (result109 !== null) {
-            var result107 = [result108, result109];
+        if (result115 !== null) {
+          var result116 = parse___(context);
+          if (result116 !== null) {
+            var result114 = [result115, result116];
           } else {
-            var result107 = null;
-            pos = savedPos19;
+            var result114 = null;
+            pos = savedPos20;
           }
         } else {
-          var result107 = null;
-          pos = savedPos19;
+          var result114 = null;
+          pos = savedPos20;
         }
-        var result106 = result107 !== null
+        var result113 = result114 !== null
           ? (function() { return ";"; })()
           : null;
         
@@ -1036,9 +1089,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result106
+          result:  result113
         };
-        return result106;
+        return result113;
       }
       
       function parse_slash(context) {
@@ -1050,29 +1103,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos20 = pos;
+        var savedPos21 = pos;
         if (input.substr(pos, 1) === "/") {
-          var result112 = "/";
+          var result119 = "/";
           pos += 1;
         } else {
-          var result112 = null;
+          var result119 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("/"));
           }
         }
-        if (result112 !== null) {
-          var result113 = parse___(context);
-          if (result113 !== null) {
-            var result111 = [result112, result113];
+        if (result119 !== null) {
+          var result120 = parse___(context);
+          if (result120 !== null) {
+            var result118 = [result119, result120];
           } else {
-            var result111 = null;
-            pos = savedPos20;
+            var result118 = null;
+            pos = savedPos21;
           }
         } else {
-          var result111 = null;
-          pos = savedPos20;
+          var result118 = null;
+          pos = savedPos21;
         }
-        var result110 = result111 !== null
+        var result117 = result118 !== null
           ? (function() { return "/"; })()
           : null;
         
@@ -1080,9 +1133,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result110
+          result:  result117
         };
-        return result110;
+        return result117;
       }
       
       function parse_and(context) {
@@ -1094,29 +1147,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos21 = pos;
+        var savedPos22 = pos;
         if (input.substr(pos, 1) === "&") {
-          var result116 = "&";
+          var result123 = "&";
           pos += 1;
         } else {
-          var result116 = null;
+          var result123 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("&"));
           }
         }
-        if (result116 !== null) {
-          var result117 = parse___(context);
-          if (result117 !== null) {
-            var result115 = [result116, result117];
+        if (result123 !== null) {
+          var result124 = parse___(context);
+          if (result124 !== null) {
+            var result122 = [result123, result124];
           } else {
-            var result115 = null;
-            pos = savedPos21;
+            var result122 = null;
+            pos = savedPos22;
           }
         } else {
-          var result115 = null;
-          pos = savedPos21;
+          var result122 = null;
+          pos = savedPos22;
         }
-        var result114 = result115 !== null
+        var result121 = result122 !== null
           ? (function() { return "&"; })()
           : null;
         
@@ -1124,9 +1177,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result114
+          result:  result121
         };
-        return result114;
+        return result121;
       }
       
       function parse_not(context) {
@@ -1138,29 +1191,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos22 = pos;
+        var savedPos23 = pos;
         if (input.substr(pos, 1) === "!") {
-          var result120 = "!";
+          var result127 = "!";
           pos += 1;
         } else {
-          var result120 = null;
+          var result127 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("!"));
           }
         }
-        if (result120 !== null) {
-          var result121 = parse___(context);
-          if (result121 !== null) {
-            var result119 = [result120, result121];
+        if (result127 !== null) {
+          var result128 = parse___(context);
+          if (result128 !== null) {
+            var result126 = [result127, result128];
           } else {
-            var result119 = null;
-            pos = savedPos22;
+            var result126 = null;
+            pos = savedPos23;
           }
         } else {
-          var result119 = null;
-          pos = savedPos22;
+          var result126 = null;
+          pos = savedPos23;
         }
-        var result118 = result119 !== null
+        var result125 = result126 !== null
           ? (function() { return "!"; })()
           : null;
         
@@ -1168,9 +1221,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result118
+          result:  result125
         };
-        return result118;
+        return result125;
       }
       
       function parse_question(context) {
@@ -1182,29 +1235,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos23 = pos;
+        var savedPos24 = pos;
         if (input.substr(pos, 1) === "?") {
-          var result124 = "?";
+          var result131 = "?";
           pos += 1;
         } else {
-          var result124 = null;
+          var result131 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("?"));
           }
         }
-        if (result124 !== null) {
-          var result125 = parse___(context);
-          if (result125 !== null) {
-            var result123 = [result124, result125];
+        if (result131 !== null) {
+          var result132 = parse___(context);
+          if (result132 !== null) {
+            var result130 = [result131, result132];
           } else {
-            var result123 = null;
-            pos = savedPos23;
+            var result130 = null;
+            pos = savedPos24;
           }
         } else {
-          var result123 = null;
-          pos = savedPos23;
+          var result130 = null;
+          pos = savedPos24;
         }
-        var result122 = result123 !== null
+        var result129 = result130 !== null
           ? (function() { return "?"; })()
           : null;
         
@@ -1212,9 +1265,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result122
+          result:  result129
         };
-        return result122;
+        return result129;
       }
       
       function parse_star(context) {
@@ -1226,29 +1279,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos24 = pos;
+        var savedPos25 = pos;
         if (input.substr(pos, 1) === "*") {
-          var result128 = "*";
+          var result135 = "*";
           pos += 1;
         } else {
-          var result128 = null;
+          var result135 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("*"));
           }
         }
-        if (result128 !== null) {
-          var result129 = parse___(context);
-          if (result129 !== null) {
-            var result127 = [result128, result129];
+        if (result135 !== null) {
+          var result136 = parse___(context);
+          if (result136 !== null) {
+            var result134 = [result135, result136];
           } else {
-            var result127 = null;
-            pos = savedPos24;
+            var result134 = null;
+            pos = savedPos25;
           }
         } else {
-          var result127 = null;
-          pos = savedPos24;
+          var result134 = null;
+          pos = savedPos25;
         }
-        var result126 = result127 !== null
+        var result133 = result134 !== null
           ? (function() { return "*"; })()
           : null;
         
@@ -1256,9 +1309,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result126
+          result:  result133
         };
-        return result126;
+        return result133;
       }
       
       function parse_plus(context) {
@@ -1270,29 +1323,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos25 = pos;
+        var savedPos26 = pos;
         if (input.substr(pos, 1) === "+") {
-          var result132 = "+";
+          var result139 = "+";
           pos += 1;
         } else {
-          var result132 = null;
+          var result139 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("+"));
           }
         }
-        if (result132 !== null) {
-          var result133 = parse___(context);
-          if (result133 !== null) {
-            var result131 = [result132, result133];
+        if (result139 !== null) {
+          var result140 = parse___(context);
+          if (result140 !== null) {
+            var result138 = [result139, result140];
           } else {
-            var result131 = null;
-            pos = savedPos25;
+            var result138 = null;
+            pos = savedPos26;
           }
         } else {
-          var result131 = null;
-          pos = savedPos25;
+          var result138 = null;
+          pos = savedPos26;
         }
-        var result130 = result131 !== null
+        var result137 = result138 !== null
           ? (function() { return "+"; })()
           : null;
         
@@ -1300,9 +1353,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result130
+          result:  result137
         };
-        return result130;
+        return result137;
       }
       
       function parse_lparen(context) {
@@ -1314,29 +1367,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos26 = pos;
+        var savedPos27 = pos;
         if (input.substr(pos, 1) === "(") {
-          var result136 = "(";
+          var result143 = "(";
           pos += 1;
         } else {
-          var result136 = null;
+          var result143 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("("));
           }
         }
-        if (result136 !== null) {
-          var result137 = parse___(context);
-          if (result137 !== null) {
-            var result135 = [result136, result137];
+        if (result143 !== null) {
+          var result144 = parse___(context);
+          if (result144 !== null) {
+            var result142 = [result143, result144];
           } else {
-            var result135 = null;
-            pos = savedPos26;
+            var result142 = null;
+            pos = savedPos27;
           }
         } else {
-          var result135 = null;
-          pos = savedPos26;
+          var result142 = null;
+          pos = savedPos27;
         }
-        var result134 = result135 !== null
+        var result141 = result142 !== null
           ? (function() { return "("; })()
           : null;
         
@@ -1344,9 +1397,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result134
+          result:  result141
         };
-        return result134;
+        return result141;
       }
       
       function parse_rparen(context) {
@@ -1358,29 +1411,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos27 = pos;
+        var savedPos28 = pos;
         if (input.substr(pos, 1) === ")") {
-          var result140 = ")";
+          var result147 = ")";
           pos += 1;
         } else {
-          var result140 = null;
+          var result147 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString(")"));
           }
         }
-        if (result140 !== null) {
-          var result141 = parse___(context);
-          if (result141 !== null) {
-            var result139 = [result140, result141];
+        if (result147 !== null) {
+          var result148 = parse___(context);
+          if (result148 !== null) {
+            var result146 = [result147, result148];
           } else {
-            var result139 = null;
-            pos = savedPos27;
+            var result146 = null;
+            pos = savedPos28;
           }
         } else {
-          var result139 = null;
-          pos = savedPos27;
+          var result146 = null;
+          pos = savedPos28;
         }
-        var result138 = result139 !== null
+        var result145 = result146 !== null
           ? (function() { return ")"; })()
           : null;
         
@@ -1388,9 +1441,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result138
+          result:  result145
         };
-        return result138;
+        return result145;
       }
       
       function parse_dot(context) {
@@ -1402,29 +1455,29 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos28 = pos;
+        var savedPos29 = pos;
         if (input.substr(pos, 1) === ".") {
-          var result144 = ".";
+          var result151 = ".";
           pos += 1;
         } else {
-          var result144 = null;
+          var result151 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("."));
           }
         }
-        if (result144 !== null) {
-          var result145 = parse___(context);
-          if (result145 !== null) {
-            var result143 = [result144, result145];
+        if (result151 !== null) {
+          var result152 = parse___(context);
+          if (result152 !== null) {
+            var result150 = [result151, result152];
           } else {
-            var result143 = null;
-            pos = savedPos28;
+            var result150 = null;
+            pos = savedPos29;
           }
         } else {
-          var result143 = null;
-          pos = savedPos28;
+          var result150 = null;
+          pos = savedPos29;
         }
-        var result142 = result143 !== null
+        var result149 = result150 !== null
           ? (function() { return "."; })()
           : null;
         
@@ -1432,9 +1485,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result142
+          result:  result149
         };
-        return result142;
+        return result149;
       }
       
       function parse_identifier(context) {
@@ -1447,149 +1500,149 @@ PEG.grammarParser = (function(){
         
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
-        var savedPos29 = pos;
-        var result158 = parse_letter(context);
-        if (result158 !== null) {
-          var result148 = result158;
+        var savedPos30 = pos;
+        var result165 = parse_letter(context);
+        if (result165 !== null) {
+          var result155 = result165;
         } else {
           if (input.substr(pos, 1) === "_") {
-            var result157 = "_";
+            var result164 = "_";
             pos += 1;
           } else {
-            var result157 = null;
+            var result164 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("_"));
             }
           }
-          if (result157 !== null) {
-            var result148 = result157;
+          if (result164 !== null) {
+            var result155 = result164;
           } else {
             if (input.substr(pos, 1) === "$") {
-              var result156 = "$";
+              var result163 = "$";
               pos += 1;
             } else {
-              var result156 = null;
+              var result163 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("$"));
               }
             }
-            if (result156 !== null) {
-              var result148 = result156;
+            if (result163 !== null) {
+              var result155 = result163;
             } else {
-              var result148 = null;;
+              var result155 = null;;
             };
           };
         }
-        if (result148 !== null) {
-          var result149 = [];
-          var result155 = parse_letter(context);
-          if (result155 !== null) {
-            var result151 = result155;
+        if (result155 !== null) {
+          var result156 = [];
+          var result162 = parse_letter(context);
+          if (result162 !== null) {
+            var result158 = result162;
           } else {
-            var result154 = parse_digit(context);
-            if (result154 !== null) {
-              var result151 = result154;
+            var result161 = parse_digit(context);
+            if (result161 !== null) {
+              var result158 = result161;
             } else {
               if (input.substr(pos, 1) === "_") {
-                var result153 = "_";
+                var result160 = "_";
                 pos += 1;
               } else {
-                var result153 = null;
+                var result160 = null;
                 if (context.reportMatchFailures) {
                   matchFailed(quoteString("_"));
                 }
               }
-              if (result153 !== null) {
-                var result151 = result153;
+              if (result160 !== null) {
+                var result158 = result160;
               } else {
                 if (input.substr(pos, 1) === "$") {
-                  var result152 = "$";
+                  var result159 = "$";
                   pos += 1;
                 } else {
-                  var result152 = null;
+                  var result159 = null;
                   if (context.reportMatchFailures) {
                     matchFailed(quoteString("$"));
                   }
                 }
-                if (result152 !== null) {
-                  var result151 = result152;
+                if (result159 !== null) {
+                  var result158 = result159;
                 } else {
-                  var result151 = null;;
+                  var result158 = null;;
                 };
               };
             };
           }
-          while (result151 !== null) {
-            result149.push(result151);
-            var result155 = parse_letter(context);
-            if (result155 !== null) {
-              var result151 = result155;
+          while (result158 !== null) {
+            result156.push(result158);
+            var result162 = parse_letter(context);
+            if (result162 !== null) {
+              var result158 = result162;
             } else {
-              var result154 = parse_digit(context);
-              if (result154 !== null) {
-                var result151 = result154;
+              var result161 = parse_digit(context);
+              if (result161 !== null) {
+                var result158 = result161;
               } else {
                 if (input.substr(pos, 1) === "_") {
-                  var result153 = "_";
+                  var result160 = "_";
                   pos += 1;
                 } else {
-                  var result153 = null;
+                  var result160 = null;
                   if (context.reportMatchFailures) {
                     matchFailed(quoteString("_"));
                   }
                 }
-                if (result153 !== null) {
-                  var result151 = result153;
+                if (result160 !== null) {
+                  var result158 = result160;
                 } else {
                   if (input.substr(pos, 1) === "$") {
-                    var result152 = "$";
+                    var result159 = "$";
                     pos += 1;
                   } else {
-                    var result152 = null;
+                    var result159 = null;
                     if (context.reportMatchFailures) {
                       matchFailed(quoteString("$"));
                     }
                   }
-                  if (result152 !== null) {
-                    var result151 = result152;
+                  if (result159 !== null) {
+                    var result158 = result159;
                   } else {
-                    var result151 = null;;
+                    var result158 = null;;
                   };
                 };
               };
             }
           }
-          if (result149 !== null) {
-            var result150 = parse___(context);
-            if (result150 !== null) {
-              var result147 = [result148, result149, result150];
+          if (result156 !== null) {
+            var result157 = parse___(context);
+            if (result157 !== null) {
+              var result154 = [result155, result156, result157];
             } else {
-              var result147 = null;
-              pos = savedPos29;
+              var result154 = null;
+              pos = savedPos30;
             }
           } else {
-            var result147 = null;
-            pos = savedPos29;
+            var result154 = null;
+            pos = savedPos30;
           }
         } else {
-          var result147 = null;
-          pos = savedPos29;
+          var result154 = null;
+          pos = savedPos30;
         }
-        var result146 = result147 !== null
+        var result153 = result154 !== null
           ? (function(head, tail) {
                 return head + tail.join("");
-              })(result147[0], result147[1])
+              })(result154[0], result154[1])
           : null;
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result146 === null) {
+        if (context.reportMatchFailures && result153 === null) {
           matchFailed("identifier");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result146
+          result:  result153
         };
-        return result146;
+        return result153;
       }
       
       function parse_literal(context) {
@@ -1602,43 +1655,43 @@ PEG.grammarParser = (function(){
         
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
-        var savedPos30 = pos;
-        var result164 = parse_doubleQuotedLiteral(context);
-        if (result164 !== null) {
-          var result161 = result164;
+        var savedPos31 = pos;
+        var result171 = parse_doubleQuotedLiteral(context);
+        if (result171 !== null) {
+          var result168 = result171;
         } else {
-          var result163 = parse_singleQuotedLiteral(context);
-          if (result163 !== null) {
-            var result161 = result163;
+          var result170 = parse_singleQuotedLiteral(context);
+          if (result170 !== null) {
+            var result168 = result170;
           } else {
-            var result161 = null;;
+            var result168 = null;;
           };
         }
-        if (result161 !== null) {
-          var result162 = parse___(context);
-          if (result162 !== null) {
-            var result160 = [result161, result162];
+        if (result168 !== null) {
+          var result169 = parse___(context);
+          if (result169 !== null) {
+            var result167 = [result168, result169];
           } else {
-            var result160 = null;
-            pos = savedPos30;
+            var result167 = null;
+            pos = savedPos31;
           }
         } else {
-          var result160 = null;
-          pos = savedPos30;
+          var result167 = null;
+          pos = savedPos31;
         }
-        var result159 = result160 !== null
-          ? (function(literal) { return literal; })(result160[0])
+        var result166 = result167 !== null
+          ? (function(literal) { return literal; })(result167[0])
           : null;
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result159 === null) {
+        if (context.reportMatchFailures && result166 === null) {
           matchFailed("literal");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result159
+          result:  result166
         };
-        return result159;
+        return result166;
       }
       
       function parse_doubleQuotedLiteral(context) {
@@ -1650,58 +1703,58 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos31 = pos;
+        var savedPos32 = pos;
         if (input.substr(pos, 1) === "\"") {
-          var result167 = "\"";
+          var result174 = "\"";
           pos += 1;
         } else {
-          var result167 = null;
+          var result174 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\""));
           }
         }
-        if (result167 !== null) {
-          var result168 = [];
-          var result170 = parse_doubleQuotedCharacter(context);
-          while (result170 !== null) {
-            result168.push(result170);
-            var result170 = parse_doubleQuotedCharacter(context);
+        if (result174 !== null) {
+          var result175 = [];
+          var result177 = parse_doubleQuotedCharacter(context);
+          while (result177 !== null) {
+            result175.push(result177);
+            var result177 = parse_doubleQuotedCharacter(context);
           }
-          if (result168 !== null) {
+          if (result175 !== null) {
             if (input.substr(pos, 1) === "\"") {
-              var result169 = "\"";
+              var result176 = "\"";
               pos += 1;
             } else {
-              var result169 = null;
+              var result176 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("\""));
               }
             }
-            if (result169 !== null) {
-              var result166 = [result167, result168, result169];
+            if (result176 !== null) {
+              var result173 = [result174, result175, result176];
             } else {
-              var result166 = null;
-              pos = savedPos31;
+              var result173 = null;
+              pos = savedPos32;
             }
           } else {
-            var result166 = null;
-            pos = savedPos31;
+            var result173 = null;
+            pos = savedPos32;
           }
         } else {
-          var result166 = null;
-          pos = savedPos31;
+          var result173 = null;
+          pos = savedPos32;
         }
-        var result165 = result166 !== null
-          ? (function(chars) { return chars.join(""); })(result166[1])
+        var result172 = result173 !== null
+          ? (function(chars) { return chars.join(""); })(result173[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result165
+          result:  result172
         };
-        return result165;
+        return result172;
       }
       
       function parse_doubleQuotedCharacter(context) {
@@ -1713,31 +1766,31 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result177 = parse_simpleDoubleQuotedCharacter(context);
-        if (result177 !== null) {
-          var result171 = result177;
+        var result184 = parse_simpleDoubleQuotedCharacter(context);
+        if (result184 !== null) {
+          var result178 = result184;
         } else {
-          var result176 = parse_simpleEscapeSequence(context);
-          if (result176 !== null) {
-            var result171 = result176;
+          var result183 = parse_simpleEscapeSequence(context);
+          if (result183 !== null) {
+            var result178 = result183;
           } else {
-            var result175 = parse_zeroEscapeSequence(context);
-            if (result175 !== null) {
-              var result171 = result175;
+            var result182 = parse_zeroEscapeSequence(context);
+            if (result182 !== null) {
+              var result178 = result182;
             } else {
-              var result174 = parse_hexEscapeSequence(context);
-              if (result174 !== null) {
-                var result171 = result174;
+              var result181 = parse_hexEscapeSequence(context);
+              if (result181 !== null) {
+                var result178 = result181;
               } else {
-                var result173 = parse_unicodeEscapeSequence(context);
-                if (result173 !== null) {
-                  var result171 = result173;
+                var result180 = parse_unicodeEscapeSequence(context);
+                if (result180 !== null) {
+                  var result178 = result180;
                 } else {
-                  var result172 = parse_eolEscapeSequence(context);
-                  if (result172 !== null) {
-                    var result171 = result172;
+                  var result179 = parse_eolEscapeSequence(context);
+                  if (result179 !== null) {
+                    var result178 = result179;
                   } else {
-                    var result171 = null;;
+                    var result178 = null;;
                   };
                 };
               };
@@ -1749,9 +1802,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result171
+          result:  result178
         };
-        return result171;
+        return result178;
       }
       
       function parse_simpleDoubleQuotedCharacter(context) {
@@ -1763,80 +1816,80 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos32 = pos;
         var savedPos33 = pos;
+        var savedPos34 = pos;
         var savedReportMatchFailuresVar1 = context.reportMatchFailures;
         context.reportMatchFailures = false;
         if (input.substr(pos, 1) === "\"") {
-          var result185 = "\"";
+          var result192 = "\"";
           pos += 1;
         } else {
-          var result185 = null;
+          var result192 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\""));
           }
         }
-        if (result185 !== null) {
-          var result182 = result185;
+        if (result192 !== null) {
+          var result189 = result192;
         } else {
           if (input.substr(pos, 1) === "\\") {
-            var result184 = "\\";
+            var result191 = "\\";
             pos += 1;
           } else {
-            var result184 = null;
+            var result191 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("\\"));
             }
           }
-          if (result184 !== null) {
-            var result182 = result184;
+          if (result191 !== null) {
+            var result189 = result191;
           } else {
-            var result183 = parse_eolChar(context);
-            if (result183 !== null) {
-              var result182 = result183;
+            var result190 = parse_eolChar(context);
+            if (result190 !== null) {
+              var result189 = result190;
             } else {
-              var result182 = null;;
+              var result189 = null;;
             };
           };
         }
         context.reportMatchFailures = savedReportMatchFailuresVar1;
-        if (result182 === null) {
-          var result180 = '';
+        if (result189 === null) {
+          var result187 = '';
         } else {
-          var result180 = null;
-          pos = savedPos33;
+          var result187 = null;
+          pos = savedPos34;
         }
-        if (result180 !== null) {
+        if (result187 !== null) {
           if (input.length > pos) {
-            var result181 = input.charAt(pos);
+            var result188 = input.charAt(pos);
             pos++;
           } else {
-            var result181 = null;
+            var result188 = null;
             if (context.reportMatchFailures) {
               matchFailed('any character');
             }
           }
-          if (result181 !== null) {
-            var result179 = [result180, result181];
+          if (result188 !== null) {
+            var result186 = [result187, result188];
           } else {
-            var result179 = null;
-            pos = savedPos32;
+            var result186 = null;
+            pos = savedPos33;
           }
         } else {
-          var result179 = null;
-          pos = savedPos32;
+          var result186 = null;
+          pos = savedPos33;
         }
-        var result178 = result179 !== null
-          ? (function(char_) { return char_; })(result179[1])
+        var result185 = result186 !== null
+          ? (function(char_) { return char_; })(result186[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result178
+          result:  result185
         };
-        return result178;
+        return result185;
       }
       
       function parse_singleQuotedLiteral(context) {
@@ -1848,58 +1901,58 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos34 = pos;
+        var savedPos35 = pos;
         if (input.substr(pos, 1) === "'") {
-          var result188 = "'";
+          var result195 = "'";
           pos += 1;
         } else {
-          var result188 = null;
+          var result195 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("'"));
           }
         }
-        if (result188 !== null) {
-          var result189 = [];
-          var result191 = parse_singleQuotedCharacter(context);
-          while (result191 !== null) {
-            result189.push(result191);
-            var result191 = parse_singleQuotedCharacter(context);
+        if (result195 !== null) {
+          var result196 = [];
+          var result198 = parse_singleQuotedCharacter(context);
+          while (result198 !== null) {
+            result196.push(result198);
+            var result198 = parse_singleQuotedCharacter(context);
           }
-          if (result189 !== null) {
+          if (result196 !== null) {
             if (input.substr(pos, 1) === "'") {
-              var result190 = "'";
+              var result197 = "'";
               pos += 1;
             } else {
-              var result190 = null;
+              var result197 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("'"));
               }
             }
-            if (result190 !== null) {
-              var result187 = [result188, result189, result190];
+            if (result197 !== null) {
+              var result194 = [result195, result196, result197];
             } else {
-              var result187 = null;
-              pos = savedPos34;
+              var result194 = null;
+              pos = savedPos35;
             }
           } else {
-            var result187 = null;
-            pos = savedPos34;
+            var result194 = null;
+            pos = savedPos35;
           }
         } else {
-          var result187 = null;
-          pos = savedPos34;
+          var result194 = null;
+          pos = savedPos35;
         }
-        var result186 = result187 !== null
-          ? (function(chars) { return chars.join(""); })(result187[1])
+        var result193 = result194 !== null
+          ? (function(chars) { return chars.join(""); })(result194[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result186
+          result:  result193
         };
-        return result186;
+        return result193;
       }
       
       function parse_singleQuotedCharacter(context) {
@@ -1911,31 +1964,31 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result198 = parse_simpleSingleQuotedCharacter(context);
-        if (result198 !== null) {
-          var result192 = result198;
+        var result205 = parse_simpleSingleQuotedCharacter(context);
+        if (result205 !== null) {
+          var result199 = result205;
         } else {
-          var result197 = parse_simpleEscapeSequence(context);
-          if (result197 !== null) {
-            var result192 = result197;
+          var result204 = parse_simpleEscapeSequence(context);
+          if (result204 !== null) {
+            var result199 = result204;
           } else {
-            var result196 = parse_zeroEscapeSequence(context);
-            if (result196 !== null) {
-              var result192 = result196;
+            var result203 = parse_zeroEscapeSequence(context);
+            if (result203 !== null) {
+              var result199 = result203;
             } else {
-              var result195 = parse_hexEscapeSequence(context);
-              if (result195 !== null) {
-                var result192 = result195;
+              var result202 = parse_hexEscapeSequence(context);
+              if (result202 !== null) {
+                var result199 = result202;
               } else {
-                var result194 = parse_unicodeEscapeSequence(context);
-                if (result194 !== null) {
-                  var result192 = result194;
+                var result201 = parse_unicodeEscapeSequence(context);
+                if (result201 !== null) {
+                  var result199 = result201;
                 } else {
-                  var result193 = parse_eolEscapeSequence(context);
-                  if (result193 !== null) {
-                    var result192 = result193;
+                  var result200 = parse_eolEscapeSequence(context);
+                  if (result200 !== null) {
+                    var result199 = result200;
                   } else {
-                    var result192 = null;;
+                    var result199 = null;;
                   };
                 };
               };
@@ -1947,9 +2000,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result192
+          result:  result199
         };
-        return result192;
+        return result199;
       }
       
       function parse_simpleSingleQuotedCharacter(context) {
@@ -1961,80 +2014,80 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos35 = pos;
         var savedPos36 = pos;
+        var savedPos37 = pos;
         var savedReportMatchFailuresVar2 = context.reportMatchFailures;
         context.reportMatchFailures = false;
         if (input.substr(pos, 1) === "'") {
-          var result206 = "'";
+          var result213 = "'";
           pos += 1;
         } else {
-          var result206 = null;
+          var result213 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("'"));
           }
         }
-        if (result206 !== null) {
-          var result203 = result206;
+        if (result213 !== null) {
+          var result210 = result213;
         } else {
           if (input.substr(pos, 1) === "\\") {
-            var result205 = "\\";
+            var result212 = "\\";
             pos += 1;
           } else {
-            var result205 = null;
+            var result212 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("\\"));
             }
           }
-          if (result205 !== null) {
-            var result203 = result205;
+          if (result212 !== null) {
+            var result210 = result212;
           } else {
-            var result204 = parse_eolChar(context);
-            if (result204 !== null) {
-              var result203 = result204;
+            var result211 = parse_eolChar(context);
+            if (result211 !== null) {
+              var result210 = result211;
             } else {
-              var result203 = null;;
+              var result210 = null;;
             };
           };
         }
         context.reportMatchFailures = savedReportMatchFailuresVar2;
-        if (result203 === null) {
-          var result201 = '';
+        if (result210 === null) {
+          var result208 = '';
         } else {
-          var result201 = null;
-          pos = savedPos36;
+          var result208 = null;
+          pos = savedPos37;
         }
-        if (result201 !== null) {
+        if (result208 !== null) {
           if (input.length > pos) {
-            var result202 = input.charAt(pos);
+            var result209 = input.charAt(pos);
             pos++;
           } else {
-            var result202 = null;
+            var result209 = null;
             if (context.reportMatchFailures) {
               matchFailed('any character');
             }
           }
-          if (result202 !== null) {
-            var result200 = [result201, result202];
+          if (result209 !== null) {
+            var result207 = [result208, result209];
           } else {
-            var result200 = null;
-            pos = savedPos35;
+            var result207 = null;
+            pos = savedPos36;
           }
         } else {
-          var result200 = null;
-          pos = savedPos35;
+          var result207 = null;
+          pos = savedPos36;
         }
-        var result199 = result200 !== null
-          ? (function(char_) { return char_; })(result200[1])
+        var result206 = result207 !== null
+          ? (function(char_) { return char_; })(result207[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result199
+          result:  result206
         };
-        return result199;
+        return result206;
       }
       
       function parse_class(context) {
@@ -2047,89 +2100,89 @@ PEG.grammarParser = (function(){
         
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
-        var savedPos37 = pos;
+        var savedPos38 = pos;
         if (input.substr(pos, 1) === "[") {
-          var result209 = "[";
+          var result216 = "[";
           pos += 1;
         } else {
-          var result209 = null;
+          var result216 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("["));
           }
         }
-        if (result209 !== null) {
+        if (result216 !== null) {
           if (input.substr(pos, 1) === "^") {
-            var result217 = "^";
+            var result224 = "^";
             pos += 1;
           } else {
-            var result217 = null;
+            var result224 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("^"));
             }
           }
-          var result210 = result217 !== null ? result217 : '';
-          if (result210 !== null) {
-            var result211 = [];
-            var result216 = parse_classCharacterRange(context);
-            if (result216 !== null) {
-              var result214 = result216;
+          var result217 = result224 !== null ? result224 : '';
+          if (result217 !== null) {
+            var result218 = [];
+            var result223 = parse_classCharacterRange(context);
+            if (result223 !== null) {
+              var result221 = result223;
             } else {
-              var result215 = parse_classCharacter(context);
-              if (result215 !== null) {
-                var result214 = result215;
+              var result222 = parse_classCharacter(context);
+              if (result222 !== null) {
+                var result221 = result222;
               } else {
-                var result214 = null;;
+                var result221 = null;;
               };
             }
-            while (result214 !== null) {
-              result211.push(result214);
-              var result216 = parse_classCharacterRange(context);
-              if (result216 !== null) {
-                var result214 = result216;
+            while (result221 !== null) {
+              result218.push(result221);
+              var result223 = parse_classCharacterRange(context);
+              if (result223 !== null) {
+                var result221 = result223;
               } else {
-                var result215 = parse_classCharacter(context);
-                if (result215 !== null) {
-                  var result214 = result215;
+                var result222 = parse_classCharacter(context);
+                if (result222 !== null) {
+                  var result221 = result222;
                 } else {
-                  var result214 = null;;
+                  var result221 = null;;
                 };
               }
             }
-            if (result211 !== null) {
+            if (result218 !== null) {
               if (input.substr(pos, 1) === "]") {
-                var result212 = "]";
+                var result219 = "]";
                 pos += 1;
               } else {
-                var result212 = null;
+                var result219 = null;
                 if (context.reportMatchFailures) {
                   matchFailed(quoteString("]"));
                 }
               }
-              if (result212 !== null) {
-                var result213 = parse___(context);
-                if (result213 !== null) {
-                  var result208 = [result209, result210, result211, result212, result213];
+              if (result219 !== null) {
+                var result220 = parse___(context);
+                if (result220 !== null) {
+                  var result215 = [result216, result217, result218, result219, result220];
                 } else {
-                  var result208 = null;
-                  pos = savedPos37;
+                  var result215 = null;
+                  pos = savedPos38;
                 }
               } else {
-                var result208 = null;
-                pos = savedPos37;
+                var result215 = null;
+                pos = savedPos38;
               }
             } else {
-              var result208 = null;
-              pos = savedPos37;
+              var result215 = null;
+              pos = savedPos38;
             }
           } else {
-            var result208 = null;
-            pos = savedPos37;
+            var result215 = null;
+            pos = savedPos38;
           }
         } else {
-          var result208 = null;
-          pos = savedPos37;
+          var result215 = null;
+          pos = savedPos38;
         }
-        var result207 = result208 !== null
+        var result214 = result215 !== null
           ? (function(inverted, parts) {
                 partsConverted = PEG.ArrayUtils.map(parts, function(part) {
                   return part.data;
@@ -2148,18 +2201,18 @@ PEG.grammarParser = (function(){
                   // FIXME: Get the raw text from the input directly.
                   rawText:  rawText
                 };
-              })(result208[1], result208[2])
+              })(result215[1], result215[2])
           : null;
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result207 === null) {
+        if (context.reportMatchFailures && result214 === null) {
           matchFailed("character class");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result207
+          result:  result214
         };
-        return result207;
+        return result214;
       }
       
       function parse_classCharacterRange(context) {
@@ -2171,35 +2224,35 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos38 = pos;
-        var result220 = parse_classCharacter(context);
-        if (result220 !== null) {
+        var savedPos39 = pos;
+        var result227 = parse_classCharacter(context);
+        if (result227 !== null) {
           if (input.substr(pos, 1) === "-") {
-            var result221 = "-";
+            var result228 = "-";
             pos += 1;
           } else {
-            var result221 = null;
+            var result228 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("-"));
             }
           }
-          if (result221 !== null) {
-            var result222 = parse_classCharacter(context);
-            if (result222 !== null) {
-              var result219 = [result220, result221, result222];
+          if (result228 !== null) {
+            var result229 = parse_classCharacter(context);
+            if (result229 !== null) {
+              var result226 = [result227, result228, result229];
             } else {
-              var result219 = null;
-              pos = savedPos38;
+              var result226 = null;
+              pos = savedPos39;
             }
           } else {
-            var result219 = null;
-            pos = savedPos38;
+            var result226 = null;
+            pos = savedPos39;
           }
         } else {
-          var result219 = null;
-          pos = savedPos38;
+          var result226 = null;
+          pos = savedPos39;
         }
-        var result218 = result219 !== null
+        var result225 = result226 !== null
           ? (function(begin, end) {
                 if (begin.data.charCodeAt(0) > end.data.charCodeAt(0)) {
                   throw new this.SyntaxError(
@@ -2212,16 +2265,16 @@ PEG.grammarParser = (function(){
                   // FIXME: Get the raw text from the input directly.
                   rawText: begin.rawText + "-" + end.rawText
                 }
-              })(result219[0], result219[2])
+              })(result226[0], result226[2])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result218
+          result:  result225
         };
-        return result218;
+        return result225;
       }
       
       function parse_classCharacter(context) {
@@ -2233,24 +2286,24 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result224 = parse_bracketDelimitedCharacter(context);
-        var result223 = result224 !== null
+        var result231 = parse_bracketDelimitedCharacter(context);
+        var result230 = result231 !== null
           ? (function(char_) {
                 return {
                   data:    char_,
                   // FIXME: Get the raw text from the input directly.
                   rawText: PEG.RegExpUtils.quoteForClass(char_)
                 };
-              })(result224)
+              })(result231)
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result223
+          result:  result230
         };
-        return result223;
+        return result230;
       }
       
       function parse_bracketDelimitedCharacter(context) {
@@ -2262,31 +2315,31 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result231 = parse_simpleBracketDelimitedCharacter(context);
-        if (result231 !== null) {
-          var result225 = result231;
+        var result238 = parse_simpleBracketDelimitedCharacter(context);
+        if (result238 !== null) {
+          var result232 = result238;
         } else {
-          var result230 = parse_simpleEscapeSequence(context);
-          if (result230 !== null) {
-            var result225 = result230;
+          var result237 = parse_simpleEscapeSequence(context);
+          if (result237 !== null) {
+            var result232 = result237;
           } else {
-            var result229 = parse_zeroEscapeSequence(context);
-            if (result229 !== null) {
-              var result225 = result229;
+            var result236 = parse_zeroEscapeSequence(context);
+            if (result236 !== null) {
+              var result232 = result236;
             } else {
-              var result228 = parse_hexEscapeSequence(context);
-              if (result228 !== null) {
-                var result225 = result228;
+              var result235 = parse_hexEscapeSequence(context);
+              if (result235 !== null) {
+                var result232 = result235;
               } else {
-                var result227 = parse_unicodeEscapeSequence(context);
-                if (result227 !== null) {
-                  var result225 = result227;
+                var result234 = parse_unicodeEscapeSequence(context);
+                if (result234 !== null) {
+                  var result232 = result234;
                 } else {
-                  var result226 = parse_eolEscapeSequence(context);
-                  if (result226 !== null) {
-                    var result225 = result226;
+                  var result233 = parse_eolEscapeSequence(context);
+                  if (result233 !== null) {
+                    var result232 = result233;
                   } else {
-                    var result225 = null;;
+                    var result232 = null;;
                   };
                 };
               };
@@ -2298,9 +2351,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result225
+          result:  result232
         };
-        return result225;
+        return result232;
       }
       
       function parse_simpleBracketDelimitedCharacter(context) {
@@ -2312,80 +2365,80 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos39 = pos;
         var savedPos40 = pos;
+        var savedPos41 = pos;
         var savedReportMatchFailuresVar3 = context.reportMatchFailures;
         context.reportMatchFailures = false;
         if (input.substr(pos, 1) === "]") {
-          var result239 = "]";
+          var result246 = "]";
           pos += 1;
         } else {
-          var result239 = null;
+          var result246 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("]"));
           }
         }
-        if (result239 !== null) {
-          var result236 = result239;
+        if (result246 !== null) {
+          var result243 = result246;
         } else {
           if (input.substr(pos, 1) === "\\") {
-            var result238 = "\\";
+            var result245 = "\\";
             pos += 1;
           } else {
-            var result238 = null;
+            var result245 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("\\"));
             }
           }
-          if (result238 !== null) {
-            var result236 = result238;
+          if (result245 !== null) {
+            var result243 = result245;
           } else {
-            var result237 = parse_eolChar(context);
-            if (result237 !== null) {
-              var result236 = result237;
+            var result244 = parse_eolChar(context);
+            if (result244 !== null) {
+              var result243 = result244;
             } else {
-              var result236 = null;;
+              var result243 = null;;
             };
           };
         }
         context.reportMatchFailures = savedReportMatchFailuresVar3;
-        if (result236 === null) {
-          var result234 = '';
+        if (result243 === null) {
+          var result241 = '';
         } else {
-          var result234 = null;
-          pos = savedPos40;
+          var result241 = null;
+          pos = savedPos41;
         }
-        if (result234 !== null) {
+        if (result241 !== null) {
           if (input.length > pos) {
-            var result235 = input.charAt(pos);
+            var result242 = input.charAt(pos);
             pos++;
           } else {
-            var result235 = null;
+            var result242 = null;
             if (context.reportMatchFailures) {
               matchFailed('any character');
             }
           }
-          if (result235 !== null) {
-            var result233 = [result234, result235];
+          if (result242 !== null) {
+            var result240 = [result241, result242];
           } else {
-            var result233 = null;
-            pos = savedPos39;
+            var result240 = null;
+            pos = savedPos40;
           }
         } else {
-          var result233 = null;
-          pos = savedPos39;
+          var result240 = null;
+          pos = savedPos40;
         }
-        var result232 = result233 !== null
-          ? (function(char_) { return char_; })(result233[1])
+        var result239 = result240 !== null
+          ? (function(char_) { return char_; })(result240[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result232
+          result:  result239
         };
-        return result232;
+        return result239;
       }
       
       function parse_simpleEscapeSequence(context) {
@@ -2397,89 +2450,89 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos41 = pos;
+        var savedPos42 = pos;
         if (input.substr(pos, 1) === "\\") {
-          var result242 = "\\";
+          var result249 = "\\";
           pos += 1;
         } else {
-          var result242 = null;
+          var result249 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\\"));
           }
         }
-        if (result242 !== null) {
-          var savedPos42 = pos;
+        if (result249 !== null) {
+          var savedPos43 = pos;
           var savedReportMatchFailuresVar4 = context.reportMatchFailures;
           context.reportMatchFailures = false;
-          var result249 = parse_digit(context);
-          if (result249 !== null) {
-            var result245 = result249;
+          var result256 = parse_digit(context);
+          if (result256 !== null) {
+            var result252 = result256;
           } else {
             if (input.substr(pos, 1) === "x") {
-              var result248 = "x";
+              var result255 = "x";
               pos += 1;
             } else {
-              var result248 = null;
+              var result255 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("x"));
               }
             }
-            if (result248 !== null) {
-              var result245 = result248;
+            if (result255 !== null) {
+              var result252 = result255;
             } else {
               if (input.substr(pos, 1) === "u") {
-                var result247 = "u";
+                var result254 = "u";
                 pos += 1;
               } else {
-                var result247 = null;
+                var result254 = null;
                 if (context.reportMatchFailures) {
                   matchFailed(quoteString("u"));
                 }
               }
-              if (result247 !== null) {
-                var result245 = result247;
+              if (result254 !== null) {
+                var result252 = result254;
               } else {
-                var result246 = parse_eolChar(context);
-                if (result246 !== null) {
-                  var result245 = result246;
+                var result253 = parse_eolChar(context);
+                if (result253 !== null) {
+                  var result252 = result253;
                 } else {
-                  var result245 = null;;
+                  var result252 = null;;
                 };
               };
             };
           }
           context.reportMatchFailures = savedReportMatchFailuresVar4;
-          if (result245 === null) {
-            var result243 = '';
+          if (result252 === null) {
+            var result250 = '';
           } else {
-            var result243 = null;
-            pos = savedPos42;
+            var result250 = null;
+            pos = savedPos43;
           }
-          if (result243 !== null) {
+          if (result250 !== null) {
             if (input.length > pos) {
-              var result244 = input.charAt(pos);
+              var result251 = input.charAt(pos);
               pos++;
             } else {
-              var result244 = null;
+              var result251 = null;
               if (context.reportMatchFailures) {
                 matchFailed('any character');
               }
             }
-            if (result244 !== null) {
-              var result241 = [result242, result243, result244];
+            if (result251 !== null) {
+              var result248 = [result249, result250, result251];
             } else {
-              var result241 = null;
-              pos = savedPos41;
+              var result248 = null;
+              pos = savedPos42;
             }
           } else {
-            var result241 = null;
-            pos = savedPos41;
+            var result248 = null;
+            pos = savedPos42;
           }
         } else {
-          var result241 = null;
-          pos = savedPos41;
+          var result248 = null;
+          pos = savedPos42;
         }
-        var result240 = result241 !== null
+        var result247 = result248 !== null
           ? (function(char_) {
                 return char_
                   .replace("b", "\b")
@@ -2488,16 +2541,16 @@ PEG.grammarParser = (function(){
                   .replace("r", "\r")
                   .replace("t", "\t")
                   .replace("v", "\x0B") // IE does not recognize "\v".
-              })(result241[2])
+              })(result248[2])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result240
+          result:  result247
         };
-        return result240;
+        return result247;
       }
       
       function parse_zeroEscapeSequence(context) {
@@ -2509,39 +2562,39 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos43 = pos;
+        var savedPos44 = pos;
         if (input.substr(pos, 2) === "\\0") {
-          var result252 = "\\0";
+          var result259 = "\\0";
           pos += 2;
         } else {
-          var result252 = null;
+          var result259 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\\0"));
           }
         }
-        if (result252 !== null) {
-          var savedPos44 = pos;
+        if (result259 !== null) {
+          var savedPos45 = pos;
           var savedReportMatchFailuresVar5 = context.reportMatchFailures;
           context.reportMatchFailures = false;
-          var result254 = parse_digit(context);
+          var result261 = parse_digit(context);
           context.reportMatchFailures = savedReportMatchFailuresVar5;
-          if (result254 === null) {
-            var result253 = '';
+          if (result261 === null) {
+            var result260 = '';
           } else {
-            var result253 = null;
-            pos = savedPos44;
+            var result260 = null;
+            pos = savedPos45;
           }
-          if (result253 !== null) {
-            var result251 = [result252, result253];
+          if (result260 !== null) {
+            var result258 = [result259, result260];
           } else {
-            var result251 = null;
-            pos = savedPos43;
+            var result258 = null;
+            pos = savedPos44;
           }
         } else {
-          var result251 = null;
-          pos = savedPos43;
+          var result258 = null;
+          pos = savedPos44;
         }
-        var result250 = result251 !== null
+        var result257 = result258 !== null
           ? (function() { return "\0"; })()
           : null;
         
@@ -2549,9 +2602,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result250
+          result:  result257
         };
-        return result250;
+        return result257;
       }
       
       function parse_hexEscapeSequence(context) {
@@ -2563,47 +2616,47 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos45 = pos;
+        var savedPos46 = pos;
         if (input.substr(pos, 2) === "\\x") {
-          var result257 = "\\x";
+          var result264 = "\\x";
           pos += 2;
         } else {
-          var result257 = null;
+          var result264 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\\x"));
           }
         }
-        if (result257 !== null) {
-          var result258 = parse_hexDigit(context);
-          if (result258 !== null) {
-            var result259 = parse_hexDigit(context);
-            if (result259 !== null) {
-              var result256 = [result257, result258, result259];
+        if (result264 !== null) {
+          var result265 = parse_hexDigit(context);
+          if (result265 !== null) {
+            var result266 = parse_hexDigit(context);
+            if (result266 !== null) {
+              var result263 = [result264, result265, result266];
             } else {
-              var result256 = null;
-              pos = savedPos45;
+              var result263 = null;
+              pos = savedPos46;
             }
           } else {
-            var result256 = null;
-            pos = savedPos45;
+            var result263 = null;
+            pos = savedPos46;
           }
         } else {
-          var result256 = null;
-          pos = savedPos45;
+          var result263 = null;
+          pos = savedPos46;
         }
-        var result255 = result256 !== null
+        var result262 = result263 !== null
           ? (function(h1, h2) {
                 return String.fromCharCode(parseInt("0x" + h1 + h2));
-              })(result256[1], result256[2])
+              })(result263[1], result263[2])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result255
+          result:  result262
         };
-        return result255;
+        return result262;
       }
       
       function parse_unicodeEscapeSequence(context) {
@@ -2615,59 +2668,59 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos46 = pos;
+        var savedPos47 = pos;
         if (input.substr(pos, 2) === "\\u") {
-          var result262 = "\\u";
+          var result269 = "\\u";
           pos += 2;
         } else {
-          var result262 = null;
+          var result269 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\\u"));
           }
         }
-        if (result262 !== null) {
-          var result263 = parse_hexDigit(context);
-          if (result263 !== null) {
-            var result264 = parse_hexDigit(context);
-            if (result264 !== null) {
-              var result265 = parse_hexDigit(context);
-              if (result265 !== null) {
-                var result266 = parse_hexDigit(context);
-                if (result266 !== null) {
-                  var result261 = [result262, result263, result264, result265, result266];
+        if (result269 !== null) {
+          var result270 = parse_hexDigit(context);
+          if (result270 !== null) {
+            var result271 = parse_hexDigit(context);
+            if (result271 !== null) {
+              var result272 = parse_hexDigit(context);
+              if (result272 !== null) {
+                var result273 = parse_hexDigit(context);
+                if (result273 !== null) {
+                  var result268 = [result269, result270, result271, result272, result273];
                 } else {
-                  var result261 = null;
-                  pos = savedPos46;
+                  var result268 = null;
+                  pos = savedPos47;
                 }
               } else {
-                var result261 = null;
-                pos = savedPos46;
+                var result268 = null;
+                pos = savedPos47;
               }
             } else {
-              var result261 = null;
-              pos = savedPos46;
+              var result268 = null;
+              pos = savedPos47;
             }
           } else {
-            var result261 = null;
-            pos = savedPos46;
+            var result268 = null;
+            pos = savedPos47;
           }
         } else {
-          var result261 = null;
-          pos = savedPos46;
+          var result268 = null;
+          pos = savedPos47;
         }
-        var result260 = result261 !== null
+        var result267 = result268 !== null
           ? (function(h1, h2, h3, h4) {
                 return String.fromCharCode(parseInt("0x" + h1 + h2 + h3 + h4));
-              })(result261[1], result261[2], result261[3], result261[4])
+              })(result268[1], result268[2], result268[3], result268[4])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result260
+          result:  result267
         };
-        return result260;
+        return result267;
       }
       
       function parse_eolEscapeSequence(context) {
@@ -2679,39 +2732,39 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos47 = pos;
+        var savedPos48 = pos;
         if (input.substr(pos, 1) === "\\") {
-          var result269 = "\\";
+          var result276 = "\\";
           pos += 1;
         } else {
-          var result269 = null;
+          var result276 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\\"));
           }
         }
-        if (result269 !== null) {
-          var result270 = parse_eol(context);
-          if (result270 !== null) {
-            var result268 = [result269, result270];
+        if (result276 !== null) {
+          var result277 = parse_eol(context);
+          if (result277 !== null) {
+            var result275 = [result276, result277];
           } else {
-            var result268 = null;
-            pos = savedPos47;
+            var result275 = null;
+            pos = savedPos48;
           }
         } else {
-          var result268 = null;
-          pos = savedPos47;
+          var result275 = null;
+          pos = savedPos48;
         }
-        var result267 = result268 !== null
-          ? (function(eol) { return eol; })(result268[1])
+        var result274 = result275 !== null
+          ? (function(eol) { return eol; })(result275[1])
           : null;
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result267
+          result:  result274
         };
-        return result267;
+        return result274;
       }
       
       function parse_digit(context) {
@@ -2724,10 +2777,10 @@ PEG.grammarParser = (function(){
         
         
         if (input.substr(pos).match(/^[0-9]/) !== null) {
-          var result271 = input.charAt(pos);
+          var result278 = input.charAt(pos);
           pos++;
         } else {
-          var result271 = null;
+          var result278 = null;
           if (context.reportMatchFailures) {
             matchFailed("[0-9]");
           }
@@ -2737,9 +2790,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result271
+          result:  result278
         };
-        return result271;
+        return result278;
       }
       
       function parse_hexDigit(context) {
@@ -2752,10 +2805,10 @@ PEG.grammarParser = (function(){
         
         
         if (input.substr(pos).match(/^[0-9a-fA-F]/) !== null) {
-          var result272 = input.charAt(pos);
+          var result279 = input.charAt(pos);
           pos++;
         } else {
-          var result272 = null;
+          var result279 = null;
           if (context.reportMatchFailures) {
             matchFailed("[0-9a-fA-F]");
           }
@@ -2765,9 +2818,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result272
+          result:  result279
         };
-        return result272;
+        return result279;
       }
       
       function parse_letter(context) {
@@ -2779,15 +2832,15 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result275 = parse_lowerCaseLetter(context);
-        if (result275 !== null) {
-          var result273 = result275;
+        var result282 = parse_lowerCaseLetter(context);
+        if (result282 !== null) {
+          var result280 = result282;
         } else {
-          var result274 = parse_upperCaseLetter(context);
-          if (result274 !== null) {
-            var result273 = result274;
+          var result281 = parse_upperCaseLetter(context);
+          if (result281 !== null) {
+            var result280 = result281;
           } else {
-            var result273 = null;;
+            var result280 = null;;
           };
         }
         
@@ -2795,9 +2848,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result273
+          result:  result280
         };
-        return result273;
+        return result280;
       }
       
       function parse_lowerCaseLetter(context) {
@@ -2810,10 +2863,10 @@ PEG.grammarParser = (function(){
         
         
         if (input.substr(pos).match(/^[a-z]/) !== null) {
-          var result276 = input.charAt(pos);
+          var result283 = input.charAt(pos);
           pos++;
         } else {
-          var result276 = null;
+          var result283 = null;
           if (context.reportMatchFailures) {
             matchFailed("[a-z]");
           }
@@ -2823,9 +2876,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result276
+          result:  result283
         };
-        return result276;
+        return result283;
       }
       
       function parse_upperCaseLetter(context) {
@@ -2838,10 +2891,10 @@ PEG.grammarParser = (function(){
         
         
         if (input.substr(pos).match(/^[A-Z]/) !== null) {
-          var result277 = input.charAt(pos);
+          var result284 = input.charAt(pos);
           pos++;
         } else {
-          var result277 = null;
+          var result284 = null;
           if (context.reportMatchFailures) {
             matchFailed("[A-Z]");
           }
@@ -2851,9 +2904,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result277
+          result:  result284
         };
-        return result277;
+        return result284;
       }
       
       function parse___(context) {
@@ -2865,38 +2918,38 @@ PEG.grammarParser = (function(){
         }
         
         
-        var result278 = [];
-        var result282 = parse_whitespace(context);
-        if (result282 !== null) {
-          var result279 = result282;
+        var result285 = [];
+        var result289 = parse_whitespace(context);
+        if (result289 !== null) {
+          var result286 = result289;
         } else {
-          var result281 = parse_eol(context);
-          if (result281 !== null) {
-            var result279 = result281;
+          var result288 = parse_eol(context);
+          if (result288 !== null) {
+            var result286 = result288;
           } else {
-            var result280 = parse_comment(context);
-            if (result280 !== null) {
-              var result279 = result280;
+            var result287 = parse_comment(context);
+            if (result287 !== null) {
+              var result286 = result287;
             } else {
-              var result279 = null;;
+              var result286 = null;;
             };
           };
         }
-        while (result279 !== null) {
-          result278.push(result279);
-          var result282 = parse_whitespace(context);
-          if (result282 !== null) {
-            var result279 = result282;
+        while (result286 !== null) {
+          result285.push(result286);
+          var result289 = parse_whitespace(context);
+          if (result289 !== null) {
+            var result286 = result289;
           } else {
-            var result281 = parse_eol(context);
-            if (result281 !== null) {
-              var result279 = result281;
+            var result288 = parse_eol(context);
+            if (result288 !== null) {
+              var result286 = result288;
             } else {
-              var result280 = parse_comment(context);
-              if (result280 !== null) {
-                var result279 = result280;
+              var result287 = parse_comment(context);
+              if (result287 !== null) {
+                var result286 = result287;
               } else {
-                var result279 = null;;
+                var result286 = null;;
               };
             };
           }
@@ -2906,9 +2959,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result278
+          result:  result285
         };
-        return result278;
+        return result285;
       }
       
       function parse_comment(context) {
@@ -2921,27 +2974,27 @@ PEG.grammarParser = (function(){
         
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
-        var result285 = parse_singleLineComment(context);
-        if (result285 !== null) {
-          var result283 = result285;
+        var result292 = parse_singleLineComment(context);
+        if (result292 !== null) {
+          var result290 = result292;
         } else {
-          var result284 = parse_multiLineComment(context);
-          if (result284 !== null) {
-            var result283 = result284;
+          var result291 = parse_multiLineComment(context);
+          if (result291 !== null) {
+            var result290 = result291;
           } else {
-            var result283 = null;;
+            var result290 = null;;
           };
         }
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result283 === null) {
+        if (context.reportMatchFailures && result290 === null) {
           matchFailed("comment");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result283
+          result:  result290
         };
-        return result283;
+        return result290;
       }
       
       function parse_singleLineComment(context) {
@@ -2953,103 +3006,103 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos48 = pos;
+        var savedPos49 = pos;
         if (input.substr(pos, 2) === "//") {
-          var result287 = "//";
+          var result294 = "//";
           pos += 2;
         } else {
-          var result287 = null;
+          var result294 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("//"));
           }
         }
-        if (result287 !== null) {
-          var result288 = [];
-          var savedPos49 = pos;
+        if (result294 !== null) {
+          var result295 = [];
           var savedPos50 = pos;
+          var savedPos51 = pos;
           var savedReportMatchFailuresVar6 = context.reportMatchFailures;
           context.reportMatchFailures = false;
-          var result292 = parse_eolChar(context);
+          var result299 = parse_eolChar(context);
           context.reportMatchFailures = savedReportMatchFailuresVar6;
-          if (result292 === null) {
-            var result290 = '';
+          if (result299 === null) {
+            var result297 = '';
           } else {
-            var result290 = null;
-            pos = savedPos50;
+            var result297 = null;
+            pos = savedPos51;
           }
-          if (result290 !== null) {
+          if (result297 !== null) {
             if (input.length > pos) {
-              var result291 = input.charAt(pos);
+              var result298 = input.charAt(pos);
               pos++;
             } else {
-              var result291 = null;
+              var result298 = null;
               if (context.reportMatchFailures) {
                 matchFailed('any character');
               }
             }
-            if (result291 !== null) {
-              var result289 = [result290, result291];
+            if (result298 !== null) {
+              var result296 = [result297, result298];
             } else {
-              var result289 = null;
-              pos = savedPos49;
+              var result296 = null;
+              pos = savedPos50;
             }
           } else {
-            var result289 = null;
-            pos = savedPos49;
+            var result296 = null;
+            pos = savedPos50;
           }
-          while (result289 !== null) {
-            result288.push(result289);
-            var savedPos49 = pos;
+          while (result296 !== null) {
+            result295.push(result296);
             var savedPos50 = pos;
+            var savedPos51 = pos;
             var savedReportMatchFailuresVar6 = context.reportMatchFailures;
             context.reportMatchFailures = false;
-            var result292 = parse_eolChar(context);
+            var result299 = parse_eolChar(context);
             context.reportMatchFailures = savedReportMatchFailuresVar6;
-            if (result292 === null) {
-              var result290 = '';
+            if (result299 === null) {
+              var result297 = '';
             } else {
-              var result290 = null;
-              pos = savedPos50;
+              var result297 = null;
+              pos = savedPos51;
             }
-            if (result290 !== null) {
+            if (result297 !== null) {
               if (input.length > pos) {
-                var result291 = input.charAt(pos);
+                var result298 = input.charAt(pos);
                 pos++;
               } else {
-                var result291 = null;
+                var result298 = null;
                 if (context.reportMatchFailures) {
                   matchFailed('any character');
                 }
               }
-              if (result291 !== null) {
-                var result289 = [result290, result291];
+              if (result298 !== null) {
+                var result296 = [result297, result298];
               } else {
-                var result289 = null;
-                pos = savedPos49;
+                var result296 = null;
+                pos = savedPos50;
               }
             } else {
-              var result289 = null;
-              pos = savedPos49;
+              var result296 = null;
+              pos = savedPos50;
             }
           }
-          if (result288 !== null) {
-            var result286 = [result287, result288];
+          if (result295 !== null) {
+            var result293 = [result294, result295];
           } else {
-            var result286 = null;
-            pos = savedPos48;
+            var result293 = null;
+            pos = savedPos49;
           }
         } else {
-          var result286 = null;
-          pos = savedPos48;
+          var result293 = null;
+          pos = savedPos49;
         }
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result286
+          result:  result293
         };
-        return result286;
+        return result293;
       }
       
       function parse_multiLineComment(context) {
@@ -3061,133 +3114,133 @@ PEG.grammarParser = (function(){
         }
         
         
-        var savedPos51 = pos;
+        var savedPos52 = pos;
         if (input.substr(pos, 2) === "/*") {
-          var result294 = "/*";
+          var result301 = "/*";
           pos += 2;
         } else {
-          var result294 = null;
+          var result301 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("/*"));
           }
         }
-        if (result294 !== null) {
-          var result295 = [];
-          var savedPos52 = pos;
+        if (result301 !== null) {
+          var result302 = [];
           var savedPos53 = pos;
+          var savedPos54 = pos;
           var savedReportMatchFailuresVar7 = context.reportMatchFailures;
           context.reportMatchFailures = false;
           if (input.substr(pos, 2) === "*/") {
-            var result300 = "*/";
+            var result307 = "*/";
             pos += 2;
           } else {
-            var result300 = null;
+            var result307 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("*/"));
             }
           }
           context.reportMatchFailures = savedReportMatchFailuresVar7;
-          if (result300 === null) {
-            var result298 = '';
+          if (result307 === null) {
+            var result305 = '';
           } else {
-            var result298 = null;
-            pos = savedPos53;
+            var result305 = null;
+            pos = savedPos54;
           }
-          if (result298 !== null) {
+          if (result305 !== null) {
             if (input.length > pos) {
-              var result299 = input.charAt(pos);
+              var result306 = input.charAt(pos);
               pos++;
             } else {
-              var result299 = null;
+              var result306 = null;
               if (context.reportMatchFailures) {
                 matchFailed('any character');
               }
             }
-            if (result299 !== null) {
-              var result297 = [result298, result299];
+            if (result306 !== null) {
+              var result304 = [result305, result306];
             } else {
-              var result297 = null;
-              pos = savedPos52;
+              var result304 = null;
+              pos = savedPos53;
             }
           } else {
-            var result297 = null;
-            pos = savedPos52;
+            var result304 = null;
+            pos = savedPos53;
           }
-          while (result297 !== null) {
-            result295.push(result297);
-            var savedPos52 = pos;
+          while (result304 !== null) {
+            result302.push(result304);
             var savedPos53 = pos;
+            var savedPos54 = pos;
             var savedReportMatchFailuresVar7 = context.reportMatchFailures;
             context.reportMatchFailures = false;
             if (input.substr(pos, 2) === "*/") {
-              var result300 = "*/";
+              var result307 = "*/";
               pos += 2;
             } else {
-              var result300 = null;
+              var result307 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("*/"));
               }
             }
             context.reportMatchFailures = savedReportMatchFailuresVar7;
-            if (result300 === null) {
-              var result298 = '';
+            if (result307 === null) {
+              var result305 = '';
             } else {
-              var result298 = null;
-              pos = savedPos53;
+              var result305 = null;
+              pos = savedPos54;
             }
-            if (result298 !== null) {
+            if (result305 !== null) {
               if (input.length > pos) {
-                var result299 = input.charAt(pos);
+                var result306 = input.charAt(pos);
                 pos++;
               } else {
-                var result299 = null;
+                var result306 = null;
                 if (context.reportMatchFailures) {
                   matchFailed('any character');
                 }
               }
-              if (result299 !== null) {
-                var result297 = [result298, result299];
+              if (result306 !== null) {
+                var result304 = [result305, result306];
               } else {
-                var result297 = null;
-                pos = savedPos52;
+                var result304 = null;
+                pos = savedPos53;
               }
             } else {
-              var result297 = null;
-              pos = savedPos52;
+              var result304 = null;
+              pos = savedPos53;
             }
           }
-          if (result295 !== null) {
+          if (result302 !== null) {
             if (input.substr(pos, 2) === "*/") {
-              var result296 = "*/";
+              var result303 = "*/";
               pos += 2;
             } else {
-              var result296 = null;
+              var result303 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("*/"));
               }
             }
-            if (result296 !== null) {
-              var result293 = [result294, result295, result296];
+            if (result303 !== null) {
+              var result300 = [result301, result302, result303];
             } else {
-              var result293 = null;
-              pos = savedPos51;
+              var result300 = null;
+              pos = savedPos52;
             }
           } else {
-            var result293 = null;
-            pos = savedPos51;
+            var result300 = null;
+            pos = savedPos52;
           }
         } else {
-          var result293 = null;
-          pos = savedPos51;
+          var result300 = null;
+          pos = savedPos52;
         }
         
         
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result293
+          result:  result300
         };
-        return result293;
+        return result300;
       }
       
       function parse_eol(context) {
@@ -3201,81 +3254,81 @@ PEG.grammarParser = (function(){
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
         if (input.substr(pos, 1) === "\n") {
-          var result306 = "\n";
+          var result313 = "\n";
           pos += 1;
         } else {
-          var result306 = null;
+          var result313 = null;
           if (context.reportMatchFailures) {
             matchFailed(quoteString("\n"));
           }
         }
-        if (result306 !== null) {
-          var result301 = result306;
+        if (result313 !== null) {
+          var result308 = result313;
         } else {
           if (input.substr(pos, 2) === "\r\n") {
-            var result305 = "\r\n";
+            var result312 = "\r\n";
             pos += 2;
           } else {
-            var result305 = null;
+            var result312 = null;
             if (context.reportMatchFailures) {
               matchFailed(quoteString("\r\n"));
             }
           }
-          if (result305 !== null) {
-            var result301 = result305;
+          if (result312 !== null) {
+            var result308 = result312;
           } else {
             if (input.substr(pos, 1) === "\r") {
-              var result304 = "\r";
+              var result311 = "\r";
               pos += 1;
             } else {
-              var result304 = null;
+              var result311 = null;
               if (context.reportMatchFailures) {
                 matchFailed(quoteString("\r"));
               }
             }
-            if (result304 !== null) {
-              var result301 = result304;
+            if (result311 !== null) {
+              var result308 = result311;
             } else {
               if (input.substr(pos, 1) === "\u2028") {
-                var result303 = "\u2028";
+                var result310 = "\u2028";
                 pos += 1;
               } else {
-                var result303 = null;
+                var result310 = null;
                 if (context.reportMatchFailures) {
                   matchFailed(quoteString("\u2028"));
                 }
               }
-              if (result303 !== null) {
-                var result301 = result303;
+              if (result310 !== null) {
+                var result308 = result310;
               } else {
                 if (input.substr(pos, 1) === "\u2029") {
-                  var result302 = "\u2029";
+                  var result309 = "\u2029";
                   pos += 1;
                 } else {
-                  var result302 = null;
+                  var result309 = null;
                   if (context.reportMatchFailures) {
                     matchFailed(quoteString("\u2029"));
                   }
                 }
-                if (result302 !== null) {
-                  var result301 = result302;
+                if (result309 !== null) {
+                  var result308 = result309;
                 } else {
-                  var result301 = null;;
+                  var result308 = null;;
                 };
               };
             };
           };
         }
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result301 === null) {
+        if (context.reportMatchFailures && result308 === null) {
           matchFailed("end of line");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result301
+          result:  result308
         };
-        return result301;
+        return result308;
       }
       
       function parse_eolChar(context) {
@@ -3288,10 +3341,10 @@ PEG.grammarParser = (function(){
         
         
         if (input.substr(pos).match(/^[\n\r\u2028\u2029]/) !== null) {
-          var result307 = input.charAt(pos);
+          var result314 = input.charAt(pos);
           pos++;
         } else {
-          var result307 = null;
+          var result314 = null;
           if (context.reportMatchFailures) {
             matchFailed("[\\n\\r\\u2028\\u2029]");
           }
@@ -3301,9 +3354,9 @@ PEG.grammarParser = (function(){
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result307
+          result:  result314
         };
-        return result307;
+        return result314;
       }
       
       function parse_whitespace(context) {
@@ -3317,24 +3370,24 @@ PEG.grammarParser = (function(){
         var savedReportMatchFailures = context.reportMatchFailures;
         context.reportMatchFailures = false;
         if (input.substr(pos).match(/^[ 	  ᠎ -   　]/) !== null) {
-          var result308 = input.charAt(pos);
+          var result315 = input.charAt(pos);
           pos++;
         } else {
-          var result308 = null;
+          var result315 = null;
           if (context.reportMatchFailures) {
             matchFailed("[ 	  ᠎ -   　]");
           }
         }
         context.reportMatchFailures = savedReportMatchFailures;
-        if (context.reportMatchFailures && result308 === null) {
+        if (context.reportMatchFailures && result315 === null) {
           matchFailed("whitespace");
         }
         
         cache[cacheKey] = {
           nextPos: pos,
-          result:  result308
+          result:  result315
         };
-        return result308;
+        return result315;
       }
       
       function buildErrorMessage() {
@@ -3392,6 +3445,8 @@ PEG.grammarParser = (function(){
         return { line: line, column: column };
       }
       
+      
+      
       var result = parse_grammar({ reportMatchFailures: true });
       
       /*
diff --git a/lib/metagrammar.pegjs b/lib/metagrammar.pegjs
index 46e3ee4..69a4b8b 100644
--- a/lib/metagrammar.pegjs
+++ b/lib/metagrammar.pegjs
@@ -1,8 +1,20 @@
 grammar
-  = __ rules:rule+ {
-      var result = {};
-      PEG.ArrayUtils.each(rules, function(rule) { result[rule.name] = rule; });
-      return result;
+  = __ initializer:initializer? rules:rule+ {
+      var rulesConverted = {};
+      PEG.ArrayUtils.each(rules, function(rule) { rulesConverted[rule.name] = rule; });
+
+      return {
+        initializer: initializer !== "" ? initializer : null,
+        rules:       rulesConverted
+      }
+    }
+
+initializer
+  = code:action semicolon? {
+      return {
+        type: "initializer",
+        code: code
+      };
     }
 
 rule
diff --git a/test/compiler-test.js b/test/compiler-test.js
index 01bc1f4..6a4625c 100644
--- a/test/compiler-test.js
+++ b/test/compiler-test.js
@@ -379,6 +379,18 @@ test("actions", function() {
   doesNotParse(notAMatchParser, "b");
 });
 
+test("initializer", function() {
+  var variableDefinitionParser = PEG.buildParser(
+    '{ a = 42; }; start = "a" { return a; }'
+  );
+  parses(variableDefinitionParser, "a", 42);
+
+  var functionDefinitionparser = PEG.buildParser(
+    '{ function f() { return 42; } }; start = "a" { return f(); }'
+  );
+  parses(variableDefinitionParser, "a", 42);
+});
+
 test("rule references", function() {
   var parser = PEG.buildParser([
     'start   = static / dynamic',
diff --git a/test/metagrammar-test.js b/test/metagrammar-test.js
index 2c0711f..7591418 100644
--- a/test/metagrammar-test.js
+++ b/test/metagrammar-test.js
@@ -20,6 +20,13 @@ global.grammarParserDoesNotParseWithMessage = function(input, message) {
 
 module("Grammar Parser");
 
+function initializer(code) {
+  return {
+    type: "initializer",
+    code: code
+  };
+}
+
 function rule(name, displayName, expression) {
   return {
     type:        "rule",
@@ -119,7 +126,10 @@ var sequenceLiterals = sequence([literalAbcd, literalEfgh, literalIjkl]);
 var choiceLiterals = choice([literalAbcd, literalEfgh, literalIjkl]);
 
 function oneRuleGrammar(expression) {
-  return { start: rule("start", null, expression) };
+  return {
+    initializer: null,
+    rules:       { start: rule("start", null, expression) }
+  };
 }
 
 var simpleGrammar = oneRuleGrammar(literal("abcd"));
@@ -144,19 +154,42 @@ function actionGrammar(action) {
   return oneRuleGrammar(action_(literal("a"), action));
 }
 
+var initializerGrammar = {
+  initializer: initializer(" code "),
+  rules: {
+    a: rule("a", null, literalAbcd),
+  }
+};
+
 /* Canonical grammar is "a: \"abcd\"; b: \"efgh\"; c: \"ijkl\";". */
 test("parses grammar", function() {
-  grammarParserParses('a = "abcd"', { a: rule("a", null, literalAbcd) });
+  grammarParserParses(
+    'a = "abcd"',
+    {
+      initializer: null,
+      rules:       { a: rule("a", null, literalAbcd) }
+    }
+  );
+  grammarParserParses('{ code }; a = "abcd"', initializerGrammar);
   grammarParserParses(
     'a = "abcd"; b = "efgh"; c = "ijkl"',
     {
-      a: rule("a", null, literalAbcd),
-      b: rule("b", null, literalEfgh),
-      c: rule("c", null, literalIjkl)
+      initializer: null,
+      rules: {
+        a: rule("a", null, literalAbcd),
+        b: rule("b", null, literalEfgh),
+        c: rule("c", null, literalIjkl)
+      }
     }
   );
 });
 
+/* Canonical initializer is "{ code }". */
+test("parses initializer", function() {
+  grammarParserParses('{ code }a = "abcd"', initializerGrammar);
+  grammarParserParses('{ code };a = "abcd"', initializerGrammar);
+});
+
 /* Canonical rule is "a: \"abcd\"". */
 test("parses rule", function() {
   grammarParserParses(
@@ -166,7 +199,8 @@ test("parses rule", function() {
   grammarParserParses(
     'start "start rule" = "abcd" / "efgh" / "ijkl"',
     {
-      start: rule("start", "start rule", choiceLiterals)
+      initializer: null,
+      rules:       { start: rule("start", "start rule", choiceLiterals) }
     }
   );
   grammarParserParses(