diff --git a/src/compiler.js b/src/compiler.js
index f8a93e9..dd10973 100644
--- a/src/compiler.js
+++ b/src/compiler.js
@@ -12,7 +12,8 @@ PEG.compiler = {
     ];
 
     var PASS_NAMES = [
-      "proxyRules"
+      "proxyRules",
+      "stackDepths"
     ];
 
     for (var i = 0; i < CHECK_NAMES.length; i++) {
diff --git a/src/emitter.js b/src/emitter.js
index 58a2bca..d0e30ab 100644
--- a/src/emitter.js
+++ b/src/emitter.js
@@ -76,19 +76,8 @@ PEG.compiler.emitter = function(ast) {
     return indentMultilineParts(interpolateVariablesInParts(args)).join("\n");
   };
 
-  /* Unique ID generator. */
-  var UID = {
-    _counters: {},
-
-    next: function(prefix) {
-      this._counters[prefix] = this._counters[prefix] || 0;
-      return prefix + this._counters[prefix]++;
-    },
-
-    reset: function() {
-      this._counters = {};
-    }
-  };
+  function resultVar(index) { return "result" + index; }
+  function posVar(index)    { return "pos"    + index; }
 
   var emit = buildNodeVisitor({
     grammar: function(node) {
@@ -332,16 +321,16 @@ PEG.compiler.emitter = function(ast) {
     },
 
     rule: function(node) {
-      /*
-       * We want to reset variable names at the beginning of every function so
-       * that a little change in the source grammar does not change variables in
-       * all the generated code. This is desired especially when one has the
-       * generated grammar stored in a VCS (this is true e.g. for our
-       * metagrammar).
-       */
-      UID.reset();
+      var context = {
+        resultIndex: 0,
+        posIndex:    0
+      };
+
+      var resultVars = map(range(node.resultStackDepth), resultVar);
+      var posVars    = map(range(node.posStackDepth),    posVar);
 
-      var resultVar = UID.next("result");
+      var resultVarsCode = resultVars.length > 0 ? "var " + resultVars.join(", ") + ";" : "";
+      var posVarsCode    = posVars.length    > 0 ? "var " + posVars.join(", ")    + ";" : "";
 
       if (node.displayName !== null) {
         var setReportFailuresCode = formatCode(
@@ -356,7 +345,7 @@ PEG.compiler.emitter = function(ast) {
           "}",
           {
             displayName: node.displayName,
-            resultVar:   resultVar
+            resultVar:   resultVar(context.resultIndex)
           }
         );
       } else {
@@ -374,6 +363,9 @@ PEG.compiler.emitter = function(ast) {
         "    return cachedResult.result;",
         "  }",
         "  ",
+        "  ${resultVarsCode}",
+        "  ${posVarsCode}",
+        "  ",
         "  ${setReportFailuresCode}",
         "  ${code}",
         "  ${restoreReportFailuresCode}",
@@ -387,51 +379,68 @@ PEG.compiler.emitter = function(ast) {
         "}",
         {
           name:                      node.name,
+          resultVarsCode:            resultVarsCode,
+          posVarsCode:               posVarsCode,
           setReportFailuresCode:     setReportFailuresCode,
           restoreReportFailuresCode: restoreReportFailuresCode,
           reportFailureCode:         reportFailureCode,
-          code:                      emit(node.expression, resultVar),
-          resultVar:                 resultVar
+          code:                      emit(node.expression, context),
+          resultVar:                 resultVar(context.resultIndex)
         }
       );
     },
 
     /*
      * The contract for all code fragments generated by the following functions
-     * is as follows:
+     * is as follows.
+     *
+     * The code fragment tries to match a part of the input starting with the
+     * position indicated in |pos|. That position may point past the end of the
+     * input.
+     *
+     * * If the code fragment matches the input, it advances |pos| to point to
+     *   the first chracter following the matched part of the input and sets
+     *   variable with a name computed by calling
+     *   |resultVar(context.resultIndex)| to an appropriate value. This value is
+     *   always non-|null|.
+     *
+     * * If the code fragment does not match the input, it returns with |pos|
+     *   set to the original value and it sets a variable with a name computed
+     *   by calling |resultVar(context.resultIndex)| to |null|.
      *
-     * * The code fragment should try to match a part of the input starting with
-     * the position indicated in |pos|. That position may point past the end of
-     * the input.
+     * The code can use variables with names computed by calling
      *
-     * * If the code fragment matches the input, it advances |pos| after the
-     *   matched part of the input and sets variable with a name stored in
-     *   |resultVar| to appropriate value, which is always non-null.
+     *   |resultVar(context.resultIndex + i)|
      *
-     * * If the code fragment does not match the input, it does not change |pos|
-     *   and it sets a variable with a name stored in |resultVar| to |null|.
+     * and
+     *
+     *   |posVar(context.posIndex + i)|
+     *
+     * where |i| >= 1 to store necessary data (return values and positions). It
+     * won't use any other variables.
      */
 
-    choice: function(node, resultVar) {
-      var code = formatCode(
-        "var ${resultVar} = null;",
-        { resultVar: resultVar }
-      );
+    choice: function(node, context) {
+      var code, nextAlternativesCode;
 
       for (var i = node.alternatives.length - 1; i >= 0; i--) {
-        var alternativeResultVar = UID.next("result");
+        nextAlternativesCode = i !== node.alternatives.length - 1
+          ? formatCode(
+              "if (${resultVar} === null) {",
+              "  ${code}",
+              "}",
+              {
+                code:      code,
+                resultVar: resultVar(context.resultIndex)
+              }
+            )
+          : "";
         code = formatCode(
-          "${alternativeCode}",
-          "if (${alternativeResultVar} !== null) {",
-          "  var ${resultVar} = ${alternativeResultVar};",
-          "} else {",
-          "  ${code};",
-          "}",
+          "${currentAlternativeCode}",
+          "${nextAlternativesCode}",
           {
-            alternativeCode:      emit(node.alternatives[i], alternativeResultVar),
-            alternativeResultVar: alternativeResultVar,
-            code:                 code,
-            resultVar:            resultVar
+            currentAlternativeCode: emit(node.alternatives[i], context),
+            nextAlternativesCode:   nextAlternativesCode
           }
         );
       }
@@ -439,177 +448,185 @@ PEG.compiler.emitter = function(ast) {
       return code;
     },
 
-    sequence: function(node, resultVar) {
-      var savedPosVar = UID.next("savedPos");
-
-      var elementResultVars = map(node.elements, function() {
-        return UID.next("result")
+    sequence: function(node, context) {
+      var elementResultVars = map(node.elements, function(element, i) {
+        return resultVar(context.resultIndex + i);
       });
 
       var code = formatCode(
-        "var ${resultVar} = ${elementResultVarArray};",
+        "${resultVar} = ${elementResultVarArray};",
         {
-          resultVar:             resultVar,
+          resultVar:             resultVar(context.resultIndex),
           elementResultVarArray: "[" + elementResultVars.join(", ") + "]"
         }
       );
+      var elementContext;
 
       for (var i = node.elements.length - 1; i >= 0; i--) {
+        elementContext = {
+          resultIndex: context.resultIndex + i,
+          posIndex:    context.posIndex + 1
+        };
         code = formatCode(
           "${elementCode}",
           "if (${elementResultVar} !== null) {",
           "  ${code}",
           "} else {",
-          "  var ${resultVar} = null;",
-          "  pos = ${savedPosVar};",
+          "  ${resultVar} = null;",
+          "  pos = ${posVar};",
           "}",
           {
-            elementCode:      emit(node.elements[i], elementResultVars[i]),
+            elementCode:      emit(node.elements[i], elementContext),
             elementResultVar: elementResultVars[i],
             code:             code,
-            savedPosVar:      savedPosVar,
-            resultVar:        resultVar
+            posVar:           posVar(context.posIndex),
+            resultVar:        resultVar(context.resultIndex)
           }
         );
       }
 
       return formatCode(
-        "var ${savedPosVar} = pos;",
+        "${posVar} = pos;",
         "${code}",
         {
-          code:        code,
-          savedPosVar: savedPosVar
+          code:   code,
+          posVar: posVar(context.posIndex)
         }
       );
     },
 
-    labeled: function(node, resultVar) {
-      return emit(node.expression, resultVar);
+    labeled: function(node, context) {
+      return emit(node.expression, context);
     },
 
-    simple_and: function(node, resultVar) {
-      var savedPosVar            = UID.next("savedPos");
-      var expressionResultVar    = UID.next("result");
+    simple_and: function(node, context) {
+      var expressionContext = {
+        resultIndex: context.resultIndex,
+        posIndex:    context.posIndex + 1
+      };
 
       return formatCode(
-        "var ${savedPosVar} = pos;",
+        "${posVar} = pos;",
         "reportFailures++;",
         "${expressionCode}",
         "reportFailures--;",
-        "if (${expressionResultVar} !== null) {",
-        "  var ${resultVar} = '';",
-        "  pos = ${savedPosVar};",
+        "if (${resultVar} !== null) {",
+        "  ${resultVar} = '';",
+        "  pos = ${posVar};",
         "} else {",
-        "  var ${resultVar} = null;",
+        "  ${resultVar} = null;",
         "}",
         {
-          expressionCode:         emit(node.expression, expressionResultVar),
-          expressionResultVar:    expressionResultVar,
-          savedPosVar:            savedPosVar,
-          resultVar:              resultVar
+          expressionCode: emit(node.expression, expressionContext),
+          posVar:         posVar(context.posIndex),
+          resultVar:      resultVar(context.resultIndex)
         }
       );
     },
 
-    simple_not: function(node, resultVar) {
-      var savedPosVar            = UID.next("savedPos");
-      var expressionResultVar    = UID.next("result");
+    simple_not: function(node, context) {
+      var expressionContext = {
+        resultIndex: context.resultIndex,
+        posIndex:    context.posIndex + 1
+      };
 
       return formatCode(
-        "var ${savedPosVar} = pos;",
+        "${posVar} = pos;",
         "reportFailures++;",
         "${expressionCode}",
         "reportFailures--;",
-        "if (${expressionResultVar} === null) {",
-        "  var ${resultVar} = '';",
+        "if (${resultVar} === null) {",
+        "  ${resultVar} = '';",
         "} else {",
-        "  var ${resultVar} = null;",
-        "  pos = ${savedPosVar};",
+        "  ${resultVar} = null;",
+        "  pos = ${posVar};",
         "}",
         {
-          expressionCode:         emit(node.expression, expressionResultVar),
-          expressionResultVar:    expressionResultVar,
-          savedPosVar:            savedPosVar,
-          resultVar:              resultVar
+          expressionCode: emit(node.expression, expressionContext),
+          posVar:         posVar(context.posIndex),
+          resultVar:      resultVar(context.resultIndex)
         }
       );
     },
 
-    semantic_and: function(node, resultVar) {
+    semantic_and: function(node, context) {
       return formatCode(
-        "var ${resultVar} = (function() {${actionCode}})() ? '' : null;",
+        "${resultVar} = (function() {${actionCode}})() ? '' : null;",
         {
-          actionCode:  node.code,
-          resultVar:   resultVar
+          actionCode: node.code,
+          resultVar:  resultVar(context.resultIndex)
         }
       );
     },
 
-    semantic_not: function(node, resultVar) {
+    semantic_not: function(node, context) {
       return formatCode(
-        "var ${resultVar} = (function() {${actionCode}})() ? null : '';",
+        "${resultVar} = (function() {${actionCode}})() ? null : '';",
         {
-          actionCode:  node.code,
-          resultVar:   resultVar
+          actionCode: node.code,
+          resultVar:  resultVar(context.resultIndex)
         }
       );
     },
 
-    optional: function(node, resultVar) {
-      var expressionResultVar = UID.next("result");
-
+    optional: function(node, context) {
       return formatCode(
         "${expressionCode}",
-        "var ${resultVar} = ${expressionResultVar} !== null ? ${expressionResultVar} : '';",
+        "${resultVar} = ${resultVar} !== null ? ${resultVar} : '';",
         {
-          expressionCode:      emit(node.expression, expressionResultVar),
-          expressionResultVar: expressionResultVar,
-          resultVar:           resultVar
+          expressionCode: emit(node.expression, context),
+          resultVar:      resultVar(context.resultIndex)
         }
       );
     },
 
-    zero_or_more: function(node, resultVar) {
-      var expressionResultVar = UID.next("result");
+    zero_or_more: function(node, context) {
+      var expressionContext = {
+        resultIndex: context.resultIndex + 1,
+        posIndex:    context.posIndex
+      };
 
       return formatCode(
-        "var ${resultVar} = [];",
+        "${resultVar} = [];",
         "${expressionCode}",
         "while (${expressionResultVar} !== null) {",
         "  ${resultVar}.push(${expressionResultVar});",
         "  ${expressionCode}",
         "}",
         {
-          expressionCode:      emit(node.expression, expressionResultVar),
-          expressionResultVar: expressionResultVar,
-          resultVar:           resultVar
+          expressionCode:      emit(node.expression, expressionContext),
+          expressionResultVar: resultVar(context.resultIndex + 1),
+          resultVar:           resultVar(context.resultIndex)
         }
       );
     },
 
-    one_or_more: function(node, resultVar) {
-      var expressionResultVar = UID.next("result");
+    one_or_more: function(node, context) {
+      var expressionContext = {
+        resultIndex: context.resultIndex + 1,
+        posIndex:    context.posIndex
+      };
 
       return formatCode(
         "${expressionCode}",
         "if (${expressionResultVar} !== null) {",
-        "  var ${resultVar} = [];",
+        "  ${resultVar} = [];",
         "  while (${expressionResultVar} !== null) {",
         "    ${resultVar}.push(${expressionResultVar});",
         "    ${expressionCode}",
         "  }",
         "} else {",
-        "  var ${resultVar} = null;",
+        "  ${resultVar} = null;",
         "}",
         {
-          expressionCode:      emit(node.expression, expressionResultVar),
-          expressionResultVar: expressionResultVar,
-          resultVar:           resultVar
+          expressionCode:      emit(node.expression, expressionContext),
+          expressionResultVar: resultVar(context.resultIndex + 1),
+          resultVar:           resultVar(context.resultIndex)
         }
       );
     },
 
-    action: function(node, resultVar) {
+    action: function(node, context) {
       /*
        * In case of sequences, we splat their elements into function arguments
        * one by one. Example:
@@ -619,9 +636,10 @@ PEG.compiler.emitter = function(ast) {
        * This behavior is reflected in this function.
        */
 
-      var expressionResultVar = UID.next("result");
-      var actionResultVar     = UID.next("result");
-      var savedPosVar         = UID.next("savedPos");
+      var expressionContext = {
+        resultIndex: context.resultIndex,
+        posIndex:    context.posIndex + 1
+      };
 
       if (node.expression.type === "sequence") {
         var formalParams = [];
@@ -632,59 +650,54 @@ PEG.compiler.emitter = function(ast) {
         for (var i = 0; i < elementsLength; i++) {
           if (elements[i].type === "labeled") {
             formalParams.push(elements[i].label);
-            actualParams.push(expressionResultVar + "[" + i + "]");
+            actualParams.push(resultVar(context.resultIndex) + "[" + i + "]");
           }
         }
       } else if (node.expression.type === "labeled") {
         var formalParams = [node.expression.label];
-        var actualParams = [expressionResultVar];
+        var actualParams = [resultVar(context.resultIndex)];
       } else {
         var formalParams = [];
         var actualParams = [];
       }
 
       return formatCode(
-        "var ${savedPosVar} = pos;",
+        "${posVar} = pos;",
         "${expressionCode}",
-        "var ${actionResultVar} = ${expressionResultVar} !== null",
-        "  ? (function(${formalParams}) {${actionCode}})(${actualParams})",
-        "  : null;",
-        "if (${actionResultVar} !== null) {",
-        "  var ${resultVar} = ${actionResultVar};",
-        "} else {",
-        "  var ${resultVar} = null;",
-        "  pos = ${savedPosVar};",
+        "if (${resultVar} !== null) {",
+        "  ${resultVar} = (function(${formalParams}) {${actionCode}})(${actualParams});",
+        "}",
+        "if (${resultVar} === null) {",
+        "  pos = ${posVar};",
         "}",
         {
-          expressionCode:      emit(node.expression, expressionResultVar),
-          expressionResultVar: expressionResultVar,
-          actionCode:          node.code,
-          actionResultVar:     actionResultVar,
-          formalParams:        formalParams.join(", "),
-          actualParams:        actualParams.join(", "),
-          savedPosVar:         savedPosVar,
-          resultVar:           resultVar
+          expressionCode: emit(node.expression, expressionContext),
+          actionCode:     node.code,
+          formalParams:   formalParams.join(", "),
+          actualParams:   actualParams.join(", "),
+          posVar:         posVar(context.posIndex),
+          resultVar:      resultVar(context.resultIndex)
         }
       );
     },
 
-    rule_ref: function(node, resultVar) {
+    rule_ref: function(node, context) {
       return formatCode(
-        "var ${resultVar} = ${ruleMethod}();",
+        "${resultVar} = ${ruleMethod}();",
         {
           ruleMethod: "parse_" + node.name,
-          resultVar:  resultVar
+          resultVar:  resultVar(context.resultIndex)
         }
       );
     },
 
-    literal: function(node, resultVar) {
+    literal: function(node, context) {
       return formatCode(
         "if (input.substr(pos, ${length}) === ${value|string}) {",
-        "  var ${resultVar} = ${value|string};",
+        "  ${resultVar} = ${value|string};",
         "  pos += ${length};",
         "} else {",
-        "  var ${resultVar} = null;",
+        "  ${resultVar} = null;",
         "  if (reportFailures === 0) {",
         "    matchFailed(${valueQuoted|string});",
         "  }",
@@ -693,27 +706,27 @@ PEG.compiler.emitter = function(ast) {
           value:       node.value,
           valueQuoted: quote(node.value),
           length:      node.value.length,
-          resultVar:   resultVar
+          resultVar:   resultVar(context.resultIndex)
         }
       );
     },
 
-    any: function(node, resultVar) {
+    any: function(node, context) {
       return formatCode(
         "if (input.length > pos) {",
-        "  var ${resultVar} = input.charAt(pos);",
+        "  ${resultVar} = input.charAt(pos);",
         "  pos++;",
         "} else {",
-        "  var ${resultVar} = null;",
+        "  ${resultVar} = null;",
         "  if (reportFailures === 0) {",
         "    matchFailed('any character');",
         "  }",
         "}",
-        { resultVar: resultVar }
+        { resultVar: resultVar(context.resultIndex) }
       );
     },
 
-    "class": function(node, resultVar) {
+    "class": function(node, context) {
       if (node.parts.length > 0) {
         var regexp = "/^["
           + (node.inverted ? "^" : "")
@@ -735,10 +748,10 @@ PEG.compiler.emitter = function(ast) {
 
       return formatCode(
         "if (input.substr(pos).match(${regexp}) !== null) {",
-        "  var ${resultVar} = input.charAt(pos);",
+        "  ${resultVar} = input.charAt(pos);",
         "  pos++;",
         "} else {",
-        "  var ${resultVar} = null;",
+        "  ${resultVar} = null;",
         "  if (reportFailures === 0) {",
         "    matchFailed(${rawText|string});",
         "  }",
@@ -746,7 +759,7 @@ PEG.compiler.emitter = function(ast) {
         {
           regexp:    regexp,
           rawText:   node.rawText,
-          resultVar: resultVar
+          resultVar: resultVar(context.resultIndex)
         }
       );
     }
diff --git a/src/parser.js b/src/parser.js
index 89f7fa1..2895ce0 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -143,40 +143,43 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result3 = parse___();
-        if (result3 !== null) {
-          var result7 = parse_initializer();
-          var result4 = result7 !== null ? result7 : '';
-          if (result4 !== null) {
-            var result6 = parse_rule();
-            if (result6 !== null) {
-              var result5 = [];
-              while (result6 !== null) {
-                result5.push(result6);
-                var result6 = parse_rule();
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse___();
+        if (result0 !== null) {
+          result1 = parse_initializer();
+          result1 = result1 !== null ? result1 : '';
+          if (result1 !== null) {
+            result3 = parse_rule();
+            if (result3 !== null) {
+              result2 = [];
+              while (result3 !== null) {
+                result2.push(result3);
+                result3 = parse_rule();
               }
             } else {
-              var result5 = null;
+              result2 = null;
             }
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(initializer, rules) {
+        if (result0 !== null) {
+          result0 = (function(initializer, rules) {
                 var rulesConverted = {};
                 each(rules, function(rule) { rulesConverted[rule.name] = rule; });
           
@@ -186,13 +189,10 @@ PEG.parser = (function(){
                   rules:       rulesConverted,
                   startRule:   rules[0].name
                 }
-              })(result1[1], result1[2])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[1], result0[2]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -212,36 +212,36 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result3 = parse_action();
-        if (result3 !== null) {
-          var result5 = parse_semicolon();
-          var result4 = result5 !== null ? result5 : '';
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_action();
+        if (result0 !== null) {
+          result1 = parse_semicolon();
+          result1 = result1 !== null ? result1 : '';
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(code) {
+        if (result0 !== null) {
+          result0 = (function(code) {
                 return {
                   type: "initializer",
                   code: code
                 };
-              })(result1[0])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[0]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -261,74 +261,68 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4, result5;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result3 = parse_identifier();
-        if (result3 !== null) {
-          var result10 = parse_literal();
-          if (result10 !== null) {
-            var result4 = result10;
-          } else {
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_identifier();
+        if (result0 !== null) {
+          result1 = parse_literal();
+          if (result1 === null) {
             if (input.substr(pos, 0) === "") {
-              var result9 = "";
+              result1 = "";
               pos += 0;
             } else {
-              var result9 = null;
+              result1 = null;
               if (reportFailures === 0) {
                 matchFailed("\"\"");
               }
             }
-            if (result9 !== null) {
-              var result4 = result9;
-            } else {
-              var result4 = null;;
-            };
-          }
-          if (result4 !== null) {
-            var result5 = parse_equals();
-            if (result5 !== null) {
-              var result6 = parse_choice();
-              if (result6 !== null) {
-                var result8 = parse_semicolon();
-                var result7 = result8 !== null ? result8 : '';
-                if (result7 !== null) {
-                  var result1 = [result3, result4, result5, result6, result7];
+            
+          }
+          if (result1 !== null) {
+            result2 = parse_equals();
+            if (result2 !== null) {
+              result3 = parse_choice();
+              if (result3 !== null) {
+                result4 = parse_semicolon();
+                result4 = result4 !== null ? result4 : '';
+                if (result4 !== null) {
+                  result0 = [result0, result1, result2, result3, result4];
                 } else {
-                  var result1 = null;
-                  pos = savedPos1;
+                  result0 = null;
+                  pos = pos1;
                 }
               } else {
-                var result1 = null;
-                pos = savedPos1;
+                result0 = null;
+                pos = pos1;
               }
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(name, displayName, expression) {
+        if (result0 !== null) {
+          result0 = (function(name, displayName, expression) {
                 return {
                   type:        "rule",
                   name:        name,
                   displayName: displayName !== "" ? displayName : null,
                   expression:  expression
                 };
-              })(result1[0], result1[1], result1[3])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[0], result0[1], result0[3]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -348,55 +342,58 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4, result5;
+        var pos0, pos1, pos2, pos3;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result3 = parse_sequence();
-        if (result3 !== null) {
-          var result4 = [];
-          var savedPos2 = pos;
-          var result6 = parse_slash();
-          if (result6 !== null) {
-            var result7 = parse_sequence();
-            if (result7 !== null) {
-              var result5 = [result6, result7];
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_sequence();
+        if (result0 !== null) {
+          result1 = [];
+          pos2 = pos;
+          result2 = parse_slash();
+          if (result2 !== null) {
+            result3 = parse_sequence();
+            if (result3 !== null) {
+              result2 = [result2, result3];
             } else {
-              var result5 = null;
-              pos = savedPos2;
+              result2 = null;
+              pos = pos2;
             }
           } else {
-            var result5 = null;
-            pos = savedPos2;
-          }
-          while (result5 !== null) {
-            result4.push(result5);
-            var savedPos2 = pos;
-            var result6 = parse_slash();
-            if (result6 !== null) {
-              var result7 = parse_sequence();
-              if (result7 !== null) {
-                var result5 = [result6, result7];
+            result2 = null;
+            pos = pos2;
+          }
+          while (result2 !== null) {
+            result1.push(result2);
+            pos2 = pos;
+            result2 = parse_slash();
+            if (result2 !== null) {
+              result3 = parse_sequence();
+              if (result3 !== null) {
+                result2 = [result2, result3];
               } else {
-                var result5 = null;
-                pos = savedPos2;
+                result2 = null;
+                pos = pos2;
               }
             } else {
-              var result5 = null;
-              pos = savedPos2;
+              result2 = null;
+              pos = pos2;
             }
           }
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(head, tail) {
+        if (result0 !== null) {
+          result0 = (function(head, tail) {
                 if (tail.length > 0) {
                   var alternatives = [head].concat(map(
                       tail,
@@ -409,13 +406,10 @@ PEG.parser = (function(){
                 } else {
                   return head;
                 }
-              })(result1[0], result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[0], result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -435,29 +429,32 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos1 = pos;
-        var savedPos2 = pos;
-        var result8 = [];
-        var result10 = parse_labeled();
-        while (result10 !== null) {
-          result8.push(result10);
-          var result10 = parse_labeled();
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = [];
+        result1 = parse_labeled();
+        while (result1 !== null) {
+          result0.push(result1);
+          result1 = parse_labeled();
         }
-        if (result8 !== null) {
-          var result9 = parse_action();
-          if (result9 !== null) {
-            var result6 = [result8, result9];
+        if (result0 !== null) {
+          result1 = parse_action();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result6 = null;
-            pos = savedPos2;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result6 = null;
-          pos = savedPos2;
+          result0 = null;
+          pos = pos1;
         }
-        var result7 = result6 !== null
-          ? (function(elements, code) {
+        if (result0 !== null) {
+          result0 = (function(elements, code) {
                 var expression = elements.length != 1
                   ? {
                       type:     "sequence",
@@ -469,45 +466,33 @@ PEG.parser = (function(){
                   expression: expression,
                   code:       code
                 };
-              })(result6[0], result6[1])
-          : null;
-        if (result7 !== null) {
-          var result5 = result7;
-        } else {
-          var result5 = null;
-          pos = savedPos1;
-        }
-        if (result5 !== null) {
-          var result0 = result5;
-        } else {
-          var savedPos0 = pos;
-          var result2 = [];
-          var result4 = parse_labeled();
-          while (result4 !== null) {
-            result2.push(result4);
-            var result4 = parse_labeled();
-          }
-          var result3 = result2 !== null
-            ? (function(elements) {
+              })(result0[0], result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
+        }
+        if (result0 === null) {
+          pos0 = pos;
+          result0 = [];
+          result1 = parse_labeled();
+          while (result1 !== null) {
+            result0.push(result1);
+            result1 = parse_labeled();
+          }
+          if (result0 !== null) {
+            result0 = (function(elements) {
                   return elements.length != 1
                     ? {
                         type:     "sequence",
                         elements: elements
                       }
                     : elements[0];
-                })(result2)
-            : null;
-          if (result3 !== null) {
-            var result1 = result3;
-          } else {
-            var result1 = null;
-            pos = savedPos0;
+                })(result0);
           }
-          if (result1 !== null) {
-            var result0 = result1;
-          } else {
-            var result0 = null;;
-          };
+          if (result0 === null) {
+            pos = pos0;
+          }
+          
         }
         
         
@@ -527,52 +512,46 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result5 = parse_identifier();
-        if (result5 !== null) {
-          var result6 = parse_colon();
-          if (result6 !== null) {
-            var result7 = parse_prefixed();
-            if (result7 !== null) {
-              var result3 = [result5, result6, result7];
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_identifier();
+        if (result0 !== null) {
+          result1 = parse_colon();
+          if (result1 !== null) {
+            result2 = parse_prefixed();
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result3 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result3 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result3 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result4 = result3 !== null
-          ? (function(label, expression) {
+        if (result0 !== null) {
+          result0 = (function(label, expression) {
                 return {
                   type:       "labeled",
                   label:      label,
                   expression: expression
                 };
-              })(result3[0], result3[2])
-          : null;
-        if (result4 !== null) {
-          var result2 = result4;
-        } else {
-          var result2 = null;
-          pos = savedPos0;
+              })(result0[0], result0[2]);
         }
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result1 = parse_prefixed();
-          if (result1 !== null) {
-            var result0 = result1;
-          } else {
-            var result0 = null;;
-          };
+        if (result0 === null) {
+          pos = pos0;
+        }
+        if (result0 === null) {
+          result0 = parse_prefixed();
+          
         }
         
         
@@ -592,144 +571,123 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos6 = pos;
-        var savedPos7 = pos;
-        var result20 = parse_and();
-        if (result20 !== null) {
-          var result21 = parse_action();
-          if (result21 !== null) {
-            var result18 = [result20, result21];
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_and();
+        if (result0 !== null) {
+          result1 = parse_action();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result18 = null;
-            pos = savedPos7;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result18 = null;
-          pos = savedPos7;
+          result0 = null;
+          pos = pos1;
         }
-        var result19 = result18 !== null
-          ? (function(code) {
+        if (result0 !== null) {
+          result0 = (function(code) {
                 return {
                   type: "semantic_and",
                   code: code
                 };
-              })(result18[1])
-          : null;
-        if (result19 !== null) {
-          var result17 = result19;
-        } else {
-          var result17 = null;
-          pos = savedPos6;
-        }
-        if (result17 !== null) {
-          var result0 = result17;
-        } else {
-          var savedPos4 = pos;
-          var savedPos5 = pos;
-          var result15 = parse_and();
-          if (result15 !== null) {
-            var result16 = parse_suffixed();
-            if (result16 !== null) {
-              var result13 = [result15, result16];
-            } else {
-              var result13 = null;
-              pos = savedPos5;
+              })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
+        }
+        if (result0 === null) {
+          pos0 = pos;
+          pos1 = pos;
+          result0 = parse_and();
+          if (result0 !== null) {
+            result1 = parse_suffixed();
+            if (result1 !== null) {
+              result0 = [result0, result1];
+            } else {
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result13 = null;
-            pos = savedPos5;
+            result0 = null;
+            pos = pos1;
           }
-          var result14 = result13 !== null
-            ? (function(expression) {
+          if (result0 !== null) {
+            result0 = (function(expression) {
                   return {
                     type:       "simple_and",
                     expression: expression
                   };
-                })(result13[1])
-            : null;
-          if (result14 !== null) {
-            var result12 = result14;
-          } else {
-            var result12 = null;
-            pos = savedPos4;
+                })(result0[1]);
           }
-          if (result12 !== null) {
-            var result0 = result12;
-          } else {
-            var savedPos2 = pos;
-            var savedPos3 = pos;
-            var result10 = parse_not();
-            if (result10 !== null) {
-              var result11 = parse_action();
-              if (result11 !== null) {
-                var result8 = [result10, result11];
+          if (result0 === null) {
+            pos = pos0;
+          }
+          if (result0 === null) {
+            pos0 = pos;
+            pos1 = pos;
+            result0 = parse_not();
+            if (result0 !== null) {
+              result1 = parse_action();
+              if (result1 !== null) {
+                result0 = [result0, result1];
               } else {
-                var result8 = null;
-                pos = savedPos3;
+                result0 = null;
+                pos = pos1;
               }
             } else {
-              var result8 = null;
-              pos = savedPos3;
+              result0 = null;
+              pos = pos1;
             }
-            var result9 = result8 !== null
-              ? (function(code) {
+            if (result0 !== null) {
+              result0 = (function(code) {
                     return {
                       type: "semantic_not",
                       code: code
                     };
-                  })(result8[1])
-              : null;
-            if (result9 !== null) {
-              var result7 = result9;
-            } else {
-              var result7 = null;
-              pos = savedPos2;
+                  })(result0[1]);
             }
-            if (result7 !== null) {
-              var result0 = result7;
-            } else {
-              var savedPos0 = pos;
-              var savedPos1 = pos;
-              var result5 = parse_not();
-              if (result5 !== null) {
-                var result6 = parse_suffixed();
-                if (result6 !== null) {
-                  var result3 = [result5, result6];
+            if (result0 === null) {
+              pos = pos0;
+            }
+            if (result0 === null) {
+              pos0 = pos;
+              pos1 = pos;
+              result0 = parse_not();
+              if (result0 !== null) {
+                result1 = parse_suffixed();
+                if (result1 !== null) {
+                  result0 = [result0, result1];
                 } else {
-                  var result3 = null;
-                  pos = savedPos1;
+                  result0 = null;
+                  pos = pos1;
                 }
               } else {
-                var result3 = null;
-                pos = savedPos1;
+                result0 = null;
+                pos = pos1;
               }
-              var result4 = result3 !== null
-                ? (function(expression) {
+              if (result0 !== null) {
+                result0 = (function(expression) {
                       return {
                         type:       "simple_not",
                         expression: expression
                       };
-                    })(result3[1])
-                : null;
-              if (result4 !== null) {
-                var result2 = result4;
-              } else {
-                var result2 = null;
-                pos = savedPos0;
+                    })(result0[1]);
               }
-              if (result2 !== null) {
-                var result0 = result2;
-              } else {
-                var result1 = parse_suffixed();
-                if (result1 !== null) {
-                  var result0 = result1;
-                } else {
-                  var result0 = null;;
-                };
-              };
-            };
-          };
+              if (result0 === null) {
+                pos = pos0;
+              }
+              if (result0 === null) {
+                result0 = parse_suffixed();
+                
+              }
+            }
+          }
         }
         
         
@@ -749,111 +707,95 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos4 = pos;
-        var savedPos5 = pos;
-        var result15 = parse_primary();
-        if (result15 !== null) {
-          var result16 = parse_question();
-          if (result16 !== null) {
-            var result13 = [result15, result16];
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_primary();
+        if (result0 !== null) {
+          result1 = parse_question();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result13 = null;
-            pos = savedPos5;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result13 = null;
-          pos = savedPos5;
+          result0 = null;
+          pos = pos1;
         }
-        var result14 = result13 !== null
-          ? (function(expression) {
+        if (result0 !== null) {
+          result0 = (function(expression) {
                 return {
                   type:       "optional",
                   expression: expression
                 };
-              })(result13[0])
-          : null;
-        if (result14 !== null) {
-          var result12 = result14;
-        } else {
-          var result12 = null;
-          pos = savedPos4;
-        }
-        if (result12 !== null) {
-          var result0 = result12;
-        } else {
-          var savedPos2 = pos;
-          var savedPos3 = pos;
-          var result10 = parse_primary();
-          if (result10 !== null) {
-            var result11 = parse_star();
-            if (result11 !== null) {
-              var result8 = [result10, result11];
-            } else {
-              var result8 = null;
-              pos = savedPos3;
+              })(result0[0]);
+        }
+        if (result0 === null) {
+          pos = pos0;
+        }
+        if (result0 === null) {
+          pos0 = pos;
+          pos1 = pos;
+          result0 = parse_primary();
+          if (result0 !== null) {
+            result1 = parse_star();
+            if (result1 !== null) {
+              result0 = [result0, result1];
+            } else {
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result8 = null;
-            pos = savedPos3;
+            result0 = null;
+            pos = pos1;
           }
-          var result9 = result8 !== null
-            ? (function(expression) {
+          if (result0 !== null) {
+            result0 = (function(expression) {
                   return {
                     type:       "zero_or_more",
                     expression: expression
                   };
-                })(result8[0])
-            : null;
-          if (result9 !== null) {
-            var result7 = result9;
-          } else {
-            var result7 = null;
-            pos = savedPos2;
+                })(result0[0]);
           }
-          if (result7 !== null) {
-            var result0 = result7;
-          } else {
-            var savedPos0 = pos;
-            var savedPos1 = pos;
-            var result5 = parse_primary();
-            if (result5 !== null) {
-              var result6 = parse_plus();
-              if (result6 !== null) {
-                var result3 = [result5, result6];
+          if (result0 === null) {
+            pos = pos0;
+          }
+          if (result0 === null) {
+            pos0 = pos;
+            pos1 = pos;
+            result0 = parse_primary();
+            if (result0 !== null) {
+              result1 = parse_plus();
+              if (result1 !== null) {
+                result0 = [result0, result1];
               } else {
-                var result3 = null;
-                pos = savedPos1;
+                result0 = null;
+                pos = pos1;
               }
             } else {
-              var result3 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
-            var result4 = result3 !== null
-              ? (function(expression) {
+            if (result0 !== null) {
+              result0 = (function(expression) {
                     return {
                       type:       "one_or_more",
                       expression: expression
                     };
-                  })(result3[0])
-              : null;
-            if (result4 !== null) {
-              var result2 = result4;
-            } else {
-              var result2 = null;
-              pos = savedPos0;
+                  })(result0[0]);
             }
-            if (result2 !== null) {
-              var result0 = result2;
-            } else {
-              var result1 = parse_primary();
-              if (result1 !== null) {
-                var result0 = result1;
-              } else {
-                var result0 = null;;
-              };
-            };
-          };
+            if (result0 === null) {
+              pos = pos0;
+            }
+            if (result0 === null) {
+              result0 = parse_primary();
+              
+            }
+          }
         }
         
         
@@ -873,154 +815,127 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4;
+        var pos0, pos1, pos2, pos3, pos4;
         
-        var savedPos4 = pos;
-        var savedPos5 = pos;
-        var result17 = parse_identifier();
-        if (result17 !== null) {
-          var savedPos6 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_identifier();
+        if (result0 !== null) {
+          pos2 = pos;
           reportFailures++;
-          var savedPos7 = pos;
-          var result23 = parse_literal();
-          if (result23 !== null) {
-            var result20 = result23;
-          } else {
+          pos3 = pos;
+          result1 = parse_literal();
+          if (result1 === null) {
             if (input.substr(pos, 0) === "") {
-              var result22 = "";
+              result1 = "";
               pos += 0;
             } else {
-              var result22 = null;
+              result1 = null;
               if (reportFailures === 0) {
                 matchFailed("\"\"");
               }
             }
-            if (result22 !== null) {
-              var result20 = result22;
-            } else {
-              var result20 = null;;
-            };
+            
           }
-          if (result20 !== null) {
-            var result21 = parse_equals();
-            if (result21 !== null) {
-              var result19 = [result20, result21];
+          if (result1 !== null) {
+            result2 = parse_equals();
+            if (result2 !== null) {
+              result1 = [result1, result2];
             } else {
-              var result19 = null;
-              pos = savedPos7;
+              result1 = null;
+              pos = pos3;
             }
           } else {
-            var result19 = null;
-            pos = savedPos7;
+            result1 = null;
+            pos = pos3;
           }
           reportFailures--;
-          if (result19 === null) {
-            var result18 = '';
+          if (result1 === null) {
+            result1 = '';
           } else {
-            var result18 = null;
-            pos = savedPos6;
+            result1 = null;
+            pos = pos2;
           }
-          if (result18 !== null) {
-            var result15 = [result17, result18];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result15 = null;
-            pos = savedPos5;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result15 = null;
-          pos = savedPos5;
+          result0 = null;
+          pos = pos1;
         }
-        var result16 = result15 !== null
-          ? (function(name) {
+        if (result0 !== null) {
+          result0 = (function(name) {
                 return {
                   type: "rule_ref",
                   name: name
                 };
-              })(result15[0])
-          : null;
-        if (result16 !== null) {
-          var result14 = result16;
-        } else {
-          var result14 = null;
-          pos = savedPos4;
+              })(result0[0]);
         }
-        if (result14 !== null) {
-          var result0 = result14;
-        } else {
-          var savedPos3 = pos;
-          var result12 = parse_literal();
-          var result13 = result12 !== null
-            ? (function(value) {
+        if (result0 === null) {
+          pos = pos0;
+        }
+        if (result0 === null) {
+          pos0 = pos;
+          result0 = parse_literal();
+          if (result0 !== null) {
+            result0 = (function(value) {
                   return {
                     type:  "literal",
                     value: value
                   };
-                })(result12)
-            : null;
-          if (result13 !== null) {
-            var result11 = result13;
-          } else {
-            var result11 = null;
-            pos = savedPos3;
+                })(result0);
           }
-          if (result11 !== null) {
-            var result0 = result11;
-          } else {
-            var savedPos2 = pos;
-            var result9 = parse_dot();
-            var result10 = result9 !== null
-              ? (function() { return { type: "any" }; })()
-              : null;
-            if (result10 !== null) {
-              var result8 = result10;
-            } else {
-              var result8 = null;
-              pos = savedPos2;
+          if (result0 === null) {
+            pos = pos0;
+          }
+          if (result0 === null) {
+            pos0 = pos;
+            result0 = parse_dot();
+            if (result0 !== null) {
+              result0 = (function() { return { type: "any" }; })();
             }
-            if (result8 !== null) {
-              var result0 = result8;
-            } else {
-              var result7 = parse_class();
-              if (result7 !== null) {
-                var result0 = result7;
-              } else {
-                var savedPos0 = pos;
-                var savedPos1 = pos;
-                var result4 = parse_lparen();
-                if (result4 !== null) {
-                  var result5 = parse_choice();
-                  if (result5 !== null) {
-                    var result6 = parse_rparen();
-                    if (result6 !== null) {
-                      var result2 = [result4, result5, result6];
+            if (result0 === null) {
+              pos = pos0;
+            }
+            if (result0 === null) {
+              result0 = parse_class();
+              if (result0 === null) {
+                pos0 = pos;
+                pos1 = pos;
+                result0 = parse_lparen();
+                if (result0 !== null) {
+                  result1 = parse_choice();
+                  if (result1 !== null) {
+                    result2 = parse_rparen();
+                    if (result2 !== null) {
+                      result0 = [result0, result1, result2];
                     } else {
-                      var result2 = null;
-                      pos = savedPos1;
+                      result0 = null;
+                      pos = pos1;
                     }
                   } else {
-                    var result2 = null;
-                    pos = savedPos1;
+                    result0 = null;
+                    pos = pos1;
                   }
                 } else {
-                  var result2 = null;
-                  pos = savedPos1;
+                  result0 = null;
+                  pos = pos1;
                 }
-                var result3 = result2 !== null
-                  ? (function(expression) { return expression; })(result2[1])
-                  : null;
-                if (result3 !== null) {
-                  var result1 = result3;
-                } else {
-                  var result1 = null;
-                  pos = savedPos0;
+                if (result0 !== null) {
+                  result0 = (function(expression) { return expression; })(result0[1]);
                 }
-                if (result1 !== null) {
-                  var result0 = result1;
-                } else {
-                  var result0 = null;;
-                };
-              };
-            };
-          };
+                if (result0 === null) {
+                  pos = pos0;
+                }
+                
+              }
+            }
+          }
         }
         
         
@@ -1040,30 +955,30 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         reportFailures++;
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result3 = parse_braced();
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_braced();
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(braced) { return braced.substr(1, braced.length - 2); })(result1[0])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(braced) { return braced.substr(1, braced.length - 2); })(result0[0]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         reportFailures--;
         if (reportFailures === 0 && result0 === null) {
@@ -1085,79 +1000,67 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "{") {
-          var result3 = "{";
+          result0 = "{";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"{\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = [];
-          var result8 = parse_braced();
-          if (result8 !== null) {
-            var result6 = result8;
-          } else {
-            var result7 = parse_nonBraceCharacter();
-            if (result7 !== null) {
-              var result6 = result7;
-            } else {
-              var result6 = null;;
-            };
-          }
-          while (result6 !== null) {
-            result4.push(result6);
-            var result8 = parse_braced();
-            if (result8 !== null) {
-              var result6 = result8;
-            } else {
-              var result7 = parse_nonBraceCharacter();
-              if (result7 !== null) {
-                var result6 = result7;
-              } else {
-                var result6 = null;;
-              };
+        if (result0 !== null) {
+          result1 = [];
+          result2 = parse_braced();
+          if (result2 === null) {
+            result2 = parse_nonBraceCharacter();
+            
+          }
+          while (result2 !== null) {
+            result1.push(result2);
+            result2 = parse_braced();
+            if (result2 === null) {
+              result2 = parse_nonBraceCharacter();
+              
             }
           }
-          if (result4 !== null) {
+          if (result1 !== null) {
             if (input.substr(pos, 1) === "}") {
-              var result5 = "}";
+              result2 = "}";
               pos += 1;
             } else {
-              var result5 = null;
+              result2 = null;
               if (reportFailures === 0) {
                 matchFailed("\"}\"");
               }
             }
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(parts) {
+        if (result0 !== null) {
+          result0 = (function(parts) {
                 return "{" + parts.join("") + "}";
-              })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1177,26 +1080,26 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1;
+        var pos0, pos1;
         
-        var savedPos0 = pos;
-        var result3 = parse_nonBraceCharacter();
-        if (result3 !== null) {
-          var result1 = [];
-          while (result3 !== null) {
-            result1.push(result3);
-            var result3 = parse_nonBraceCharacter();
+        
+        pos0 = pos;
+        result1 = parse_nonBraceCharacter();
+        if (result1 !== null) {
+          result0 = [];
+          while (result1 !== null) {
+            result0.push(result1);
+            result1 = parse_nonBraceCharacter();
           }
         } else {
-          var result1 = null;
+          result0 = null;
         }
-        var result2 = result1 !== null
-          ? (function(chars) { return chars.join(""); })(result1)
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(chars) { return chars.join(""); })(result0);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1216,12 +1119,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         
         if (input.substr(pos).match(/^[^{}]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[^{}]");
           }
@@ -1244,38 +1150,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "=") {
-          var result3 = "=";
+          result0 = "=";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"=\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "="; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "="; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1295,38 +1201,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === ":") {
-          var result3 = ":";
+          result0 = ":";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\":\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return ":"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return ":"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1346,38 +1252,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === ";") {
-          var result3 = ";";
+          result0 = ";";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\";\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return ";"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return ";"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1397,38 +1303,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "/") {
-          var result3 = "/";
+          result0 = "/";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"/\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "/"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "/"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1448,38 +1354,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "&") {
-          var result3 = "&";
+          result0 = "&";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"&\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "&"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "&"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1499,38 +1405,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "!") {
-          var result3 = "!";
+          result0 = "!";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"!\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "!"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "!"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1550,38 +1456,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "?") {
-          var result3 = "?";
+          result0 = "?";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"?\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "?"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "?"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1601,38 +1507,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "*") {
-          var result3 = "*";
+          result0 = "*";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"*\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "*"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "*"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1652,38 +1558,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "+") {
-          var result3 = "+";
+          result0 = "+";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"+\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "+"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "+"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1703,38 +1609,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "(") {
-          var result3 = "(";
+          result0 = "(";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"(\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "("; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "("; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1754,38 +1660,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === ")") {
-          var result3 = ")";
+          result0 = ")";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\")\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return ")"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return ")"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1805,38 +1711,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === ".") {
-          var result3 = ".";
+          result0 = ".";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\".\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "."; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "."; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -1856,146 +1762,118 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
+        
         reportFailures++;
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result13 = parse_letter();
-        if (result13 !== null) {
-          var result3 = result13;
-        } else {
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_letter();
+        if (result0 === null) {
           if (input.substr(pos, 1) === "_") {
-            var result12 = "_";
+            result0 = "_";
             pos += 1;
           } else {
-            var result12 = null;
+            result0 = null;
             if (reportFailures === 0) {
               matchFailed("\"_\"");
             }
           }
-          if (result12 !== null) {
-            var result3 = result12;
-          } else {
+          if (result0 === null) {
             if (input.substr(pos, 1) === "$") {
-              var result11 = "$";
+              result0 = "$";
               pos += 1;
             } else {
-              var result11 = null;
+              result0 = null;
               if (reportFailures === 0) {
                 matchFailed("\"$\"");
               }
             }
-            if (result11 !== null) {
-              var result3 = result11;
-            } else {
-              var result3 = null;;
-            };
-          };
-        }
-        if (result3 !== null) {
-          var result4 = [];
-          var result10 = parse_letter();
-          if (result10 !== null) {
-            var result6 = result10;
-          } else {
-            var result9 = parse_digit();
-            if (result9 !== null) {
-              var result6 = result9;
-            } else {
+            
+          }
+        }
+        if (result0 !== null) {
+          result1 = [];
+          result2 = parse_letter();
+          if (result2 === null) {
+            result2 = parse_digit();
+            if (result2 === null) {
               if (input.substr(pos, 1) === "_") {
-                var result8 = "_";
+                result2 = "_";
                 pos += 1;
               } else {
-                var result8 = null;
+                result2 = null;
                 if (reportFailures === 0) {
                   matchFailed("\"_\"");
                 }
               }
-              if (result8 !== null) {
-                var result6 = result8;
-              } else {
+              if (result2 === null) {
                 if (input.substr(pos, 1) === "$") {
-                  var result7 = "$";
+                  result2 = "$";
                   pos += 1;
                 } else {
-                  var result7 = null;
+                  result2 = null;
                   if (reportFailures === 0) {
                     matchFailed("\"$\"");
                   }
                 }
-                if (result7 !== null) {
-                  var result6 = result7;
-                } else {
-                  var result6 = null;;
-                };
-              };
-            };
-          }
-          while (result6 !== null) {
-            result4.push(result6);
-            var result10 = parse_letter();
-            if (result10 !== null) {
-              var result6 = result10;
-            } else {
-              var result9 = parse_digit();
-              if (result9 !== null) {
-                var result6 = result9;
-              } else {
+                
+              }
+            }
+          }
+          while (result2 !== null) {
+            result1.push(result2);
+            result2 = parse_letter();
+            if (result2 === null) {
+              result2 = parse_digit();
+              if (result2 === null) {
                 if (input.substr(pos, 1) === "_") {
-                  var result8 = "_";
+                  result2 = "_";
                   pos += 1;
                 } else {
-                  var result8 = null;
+                  result2 = null;
                   if (reportFailures === 0) {
                     matchFailed("\"_\"");
                   }
                 }
-                if (result8 !== null) {
-                  var result6 = result8;
-                } else {
+                if (result2 === null) {
                   if (input.substr(pos, 1) === "$") {
-                    var result7 = "$";
+                    result2 = "$";
                     pos += 1;
                   } else {
-                    var result7 = null;
+                    result2 = null;
                     if (reportFailures === 0) {
                       matchFailed("\"$\"");
                     }
                   }
-                  if (result7 !== null) {
-                    var result6 = result7;
-                  } else {
-                    var result6 = null;;
-                  };
-                };
-              };
+                  
+                }
+              }
             }
           }
-          if (result4 !== null) {
-            var result5 = parse___();
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+          if (result1 !== null) {
+            result2 = parse___();
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(head, tail) {
+        if (result0 !== null) {
+          result0 = (function(head, tail) {
                 return head + tail.join("");
-              })(result1[0], result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[0], result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         reportFailures--;
         if (reportFailures === 0 && result0 === null) {
@@ -2017,40 +1895,34 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
+        
         reportFailures++;
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result6 = parse_doubleQuotedLiteral();
-        if (result6 !== null) {
-          var result3 = result6;
-        } else {
-          var result5 = parse_singleQuotedLiteral();
-          if (result5 !== null) {
-            var result3 = result5;
-          } else {
-            var result3 = null;;
-          };
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_doubleQuotedLiteral();
+        if (result0 === null) {
+          result0 = parse_singleQuotedLiteral();
+          
         }
-        if (result3 !== null) {
-          var result4 = parse___();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse___();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(literal) { return literal; })(result1[0])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(literal) { return literal; })(result0[0]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         reportFailures--;
         if (reportFailures === 0 && result0 === null) {
@@ -2072,57 +1944,57 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "\"") {
-          var result3 = "\"";
+          result0 = "\"";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\"\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = [];
-          var result6 = parse_doubleQuotedCharacter();
-          while (result6 !== null) {
-            result4.push(result6);
-            var result6 = parse_doubleQuotedCharacter();
+        if (result0 !== null) {
+          result1 = [];
+          result2 = parse_doubleQuotedCharacter();
+          while (result2 !== null) {
+            result1.push(result2);
+            result2 = parse_doubleQuotedCharacter();
           }
-          if (result4 !== null) {
+          if (result1 !== null) {
             if (input.substr(pos, 1) === "\"") {
-              var result5 = "\"";
+              result2 = "\"";
               pos += 1;
             } else {
-              var result5 = null;
+              result2 = null;
               if (reportFailures === 0) {
                 matchFailed("\"\\\"\"");
               }
             }
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(chars) { return chars.join(""); })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(chars) { return chars.join(""); })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2142,37 +2014,26 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
         
-        var result6 = parse_simpleDoubleQuotedCharacter();
-        if (result6 !== null) {
-          var result0 = result6;
-        } else {
-          var result5 = parse_simpleEscapeSequence();
-          if (result5 !== null) {
-            var result0 = result5;
-          } else {
-            var result4 = parse_zeroEscapeSequence();
-            if (result4 !== null) {
-              var result0 = result4;
-            } else {
-              var result3 = parse_hexEscapeSequence();
-              if (result3 !== null) {
-                var result0 = result3;
-              } else {
-                var result2 = parse_unicodeEscapeSequence();
-                if (result2 !== null) {
-                  var result0 = result2;
-                } else {
-                  var result1 = parse_eolEscapeSequence();
-                  if (result1 !== null) {
-                    var result0 = result1;
-                  } else {
-                    var result0 = null;;
-                  };
-                };
-              };
-            };
-          };
+        
+        result0 = parse_simpleDoubleQuotedCharacter();
+        if (result0 === null) {
+          result0 = parse_simpleEscapeSequence();
+          if (result0 === null) {
+            result0 = parse_zeroEscapeSequence();
+            if (result0 === null) {
+              result0 = parse_hexEscapeSequence();
+              if (result0 === null) {
+                result0 = parse_unicodeEscapeSequence();
+                if (result0 === null) {
+                  result0 = parse_eolEscapeSequence();
+                  
+                }
+              }
+            }
+          }
         }
         
         
@@ -2192,78 +2053,70 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2, pos3;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var savedPos2 = pos;
+        pos0 = pos;
+        pos1 = pos;
+        pos2 = pos;
         reportFailures++;
         if (input.substr(pos, 1) === "\"") {
-          var result8 = "\"";
+          result0 = "\"";
           pos += 1;
         } else {
-          var result8 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\"\"");
           }
         }
-        if (result8 !== null) {
-          var result5 = result8;
-        } else {
+        if (result0 === null) {
           if (input.substr(pos, 1) === "\\") {
-            var result7 = "\\";
+            result0 = "\\";
             pos += 1;
           } else {
-            var result7 = null;
+            result0 = null;
             if (reportFailures === 0) {
               matchFailed("\"\\\\\"");
             }
           }
-          if (result7 !== null) {
-            var result5 = result7;
-          } else {
-            var result6 = parse_eolChar();
-            if (result6 !== null) {
-              var result5 = result6;
-            } else {
-              var result5 = null;;
-            };
-          };
+          if (result0 === null) {
+            result0 = parse_eolChar();
+            
+          }
         }
         reportFailures--;
-        if (result5 === null) {
-          var result3 = '';
+        if (result0 === null) {
+          result0 = '';
         } else {
-          var result3 = null;
-          pos = savedPos2;
+          result0 = null;
+          pos = pos2;
         }
-        if (result3 !== null) {
+        if (result0 !== null) {
           if (input.length > pos) {
-            var result4 = input.charAt(pos);
+            result1 = input.charAt(pos);
             pos++;
           } else {
-            var result4 = null;
+            result1 = null;
             if (reportFailures === 0) {
               matchFailed('any character');
             }
           }
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(char_) { return char_; })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(char_) { return char_; })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2283,57 +2136,57 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "'") {
-          var result3 = "'";
+          result0 = "'";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"'\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = [];
-          var result6 = parse_singleQuotedCharacter();
-          while (result6 !== null) {
-            result4.push(result6);
-            var result6 = parse_singleQuotedCharacter();
+        if (result0 !== null) {
+          result1 = [];
+          result2 = parse_singleQuotedCharacter();
+          while (result2 !== null) {
+            result1.push(result2);
+            result2 = parse_singleQuotedCharacter();
           }
-          if (result4 !== null) {
+          if (result1 !== null) {
             if (input.substr(pos, 1) === "'") {
-              var result5 = "'";
+              result2 = "'";
               pos += 1;
             } else {
-              var result5 = null;
+              result2 = null;
               if (reportFailures === 0) {
                 matchFailed("\"'\"");
               }
             }
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(chars) { return chars.join(""); })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(chars) { return chars.join(""); })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2353,37 +2206,26 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
         
-        var result6 = parse_simpleSingleQuotedCharacter();
-        if (result6 !== null) {
-          var result0 = result6;
-        } else {
-          var result5 = parse_simpleEscapeSequence();
-          if (result5 !== null) {
-            var result0 = result5;
-          } else {
-            var result4 = parse_zeroEscapeSequence();
-            if (result4 !== null) {
-              var result0 = result4;
-            } else {
-              var result3 = parse_hexEscapeSequence();
-              if (result3 !== null) {
-                var result0 = result3;
-              } else {
-                var result2 = parse_unicodeEscapeSequence();
-                if (result2 !== null) {
-                  var result0 = result2;
-                } else {
-                  var result1 = parse_eolEscapeSequence();
-                  if (result1 !== null) {
-                    var result0 = result1;
-                  } else {
-                    var result0 = null;;
-                  };
-                };
-              };
-            };
-          };
+        
+        result0 = parse_simpleSingleQuotedCharacter();
+        if (result0 === null) {
+          result0 = parse_simpleEscapeSequence();
+          if (result0 === null) {
+            result0 = parse_zeroEscapeSequence();
+            if (result0 === null) {
+              result0 = parse_hexEscapeSequence();
+              if (result0 === null) {
+                result0 = parse_unicodeEscapeSequence();
+                if (result0 === null) {
+                  result0 = parse_eolEscapeSequence();
+                  
+                }
+              }
+            }
+          }
         }
         
         
@@ -2403,78 +2245,70 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2, pos3;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var savedPos2 = pos;
+        pos0 = pos;
+        pos1 = pos;
+        pos2 = pos;
         reportFailures++;
         if (input.substr(pos, 1) === "'") {
-          var result8 = "'";
+          result0 = "'";
           pos += 1;
         } else {
-          var result8 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"'\"");
           }
         }
-        if (result8 !== null) {
-          var result5 = result8;
-        } else {
+        if (result0 === null) {
           if (input.substr(pos, 1) === "\\") {
-            var result7 = "\\";
+            result0 = "\\";
             pos += 1;
           } else {
-            var result7 = null;
+            result0 = null;
             if (reportFailures === 0) {
               matchFailed("\"\\\\\"");
             }
           }
-          if (result7 !== null) {
-            var result5 = result7;
-          } else {
-            var result6 = parse_eolChar();
-            if (result6 !== null) {
-              var result5 = result6;
-            } else {
-              var result5 = null;;
-            };
-          };
+          if (result0 === null) {
+            result0 = parse_eolChar();
+            
+          }
         }
         reportFailures--;
-        if (result5 === null) {
-          var result3 = '';
+        if (result0 === null) {
+          result0 = '';
         } else {
-          var result3 = null;
-          pos = savedPos2;
+          result0 = null;
+          pos = pos2;
         }
-        if (result3 !== null) {
+        if (result0 !== null) {
           if (input.length > pos) {
-            var result4 = input.charAt(pos);
+            result1 = input.charAt(pos);
             pos++;
           } else {
-            var result4 = null;
+            result1 = null;
             if (reportFailures === 0) {
               matchFailed('any character');
             }
           }
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(char_) { return char_; })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(char_) { return char_; })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2494,92 +2328,83 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4, result5;
+        var pos0, pos1, pos2;
+        
         reportFailures++;
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "[") {
-          var result3 = "[";
+          result0 = "[";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"[\"");
           }
         }
-        if (result3 !== null) {
+        if (result0 !== null) {
           if (input.substr(pos, 1) === "^") {
-            var result11 = "^";
+            result1 = "^";
             pos += 1;
           } else {
-            var result11 = null;
+            result1 = null;
             if (reportFailures === 0) {
               matchFailed("\"^\"");
             }
           }
-          var result4 = result11 !== null ? result11 : '';
-          if (result4 !== null) {
-            var result5 = [];
-            var result10 = parse_classCharacterRange();
-            if (result10 !== null) {
-              var result8 = result10;
-            } else {
-              var result9 = parse_classCharacter();
-              if (result9 !== null) {
-                var result8 = result9;
-              } else {
-                var result8 = null;;
-              };
-            }
-            while (result8 !== null) {
-              result5.push(result8);
-              var result10 = parse_classCharacterRange();
-              if (result10 !== null) {
-                var result8 = result10;
-              } else {
-                var result9 = parse_classCharacter();
-                if (result9 !== null) {
-                  var result8 = result9;
-                } else {
-                  var result8 = null;;
-                };
+          result1 = result1 !== null ? result1 : '';
+          if (result1 !== null) {
+            result2 = [];
+            result3 = parse_classCharacterRange();
+            if (result3 === null) {
+              result3 = parse_classCharacter();
+              
+            }
+            while (result3 !== null) {
+              result2.push(result3);
+              result3 = parse_classCharacterRange();
+              if (result3 === null) {
+                result3 = parse_classCharacter();
+                
               }
             }
-            if (result5 !== null) {
+            if (result2 !== null) {
               if (input.substr(pos, 1) === "]") {
-                var result6 = "]";
+                result3 = "]";
                 pos += 1;
               } else {
-                var result6 = null;
+                result3 = null;
                 if (reportFailures === 0) {
                   matchFailed("\"]\"");
                 }
               }
-              if (result6 !== null) {
-                var result7 = parse___();
-                if (result7 !== null) {
-                  var result1 = [result3, result4, result5, result6, result7];
+              if (result3 !== null) {
+                result4 = parse___();
+                if (result4 !== null) {
+                  result0 = [result0, result1, result2, result3, result4];
                 } else {
-                  var result1 = null;
-                  pos = savedPos1;
+                  result0 = null;
+                  pos = pos1;
                 }
               } else {
-                var result1 = null;
-                pos = savedPos1;
+                result0 = null;
+                pos = pos1;
               }
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(inverted, parts) {
+        if (result0 !== null) {
+          result0 = (function(inverted, parts) {
                 var partsConverted = map(parts, function(part) { return part.data; });
                 var rawText = "["
                   + inverted
@@ -2593,13 +2418,10 @@ PEG.parser = (function(){
                   // FIXME: Get the raw text from the input directly.
                   rawText:  rawText
                 };
-              })(result1[1], result1[2])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[1], result0[2]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         reportFailures--;
         if (reportFailures === 0 && result0 === null) {
@@ -2621,38 +2443,41 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var result3 = parse_classCharacter();
-        if (result3 !== null) {
+        
+        pos0 = pos;
+        pos1 = pos;
+        result0 = parse_classCharacter();
+        if (result0 !== null) {
           if (input.substr(pos, 1) === "-") {
-            var result4 = "-";
+            result1 = "-";
             pos += 1;
           } else {
-            var result4 = null;
+            result1 = null;
             if (reportFailures === 0) {
               matchFailed("\"-\"");
             }
           }
-          if (result4 !== null) {
-            var result5 = parse_classCharacter();
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+          if (result1 !== null) {
+            result2 = parse_classCharacter();
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(begin, end) {
+        if (result0 !== null) {
+          result0 = (function(begin, end) {
                 if (begin.data.charCodeAt(0) > end.data.charCodeAt(0)) {
                   throw new this.SyntaxError(
                     "Invalid character range: " + begin.rawText + "-" + end.rawText + "."
@@ -2664,13 +2489,10 @@ PEG.parser = (function(){
                   // FIXME: Get the raw text from the input directly.
                   rawText: begin.rawText + "-" + end.rawText
                 }
-              })(result1[0], result1[2])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[0], result0[2]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2690,23 +2512,23 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0, pos1;
+        
         
-        var savedPos0 = pos;
-        var result1 = parse_bracketDelimitedCharacter();
-        var result2 = result1 !== null
-          ? (function(char_) {
+        pos0 = pos;
+        result0 = parse_bracketDelimitedCharacter();
+        if (result0 !== null) {
+          result0 = (function(char_) {
                 return {
                   data:    char_,
                   // FIXME: Get the raw text from the input directly.
                   rawText: quoteForRegexpClass(char_)
                 };
-              })(result1)
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2726,37 +2548,26 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
         
-        var result6 = parse_simpleBracketDelimitedCharacter();
-        if (result6 !== null) {
-          var result0 = result6;
-        } else {
-          var result5 = parse_simpleEscapeSequence();
-          if (result5 !== null) {
-            var result0 = result5;
-          } else {
-            var result4 = parse_zeroEscapeSequence();
-            if (result4 !== null) {
-              var result0 = result4;
-            } else {
-              var result3 = parse_hexEscapeSequence();
-              if (result3 !== null) {
-                var result0 = result3;
-              } else {
-                var result2 = parse_unicodeEscapeSequence();
-                if (result2 !== null) {
-                  var result0 = result2;
-                } else {
-                  var result1 = parse_eolEscapeSequence();
-                  if (result1 !== null) {
-                    var result0 = result1;
-                  } else {
-                    var result0 = null;;
-                  };
-                };
-              };
-            };
-          };
+        
+        result0 = parse_simpleBracketDelimitedCharacter();
+        if (result0 === null) {
+          result0 = parse_simpleEscapeSequence();
+          if (result0 === null) {
+            result0 = parse_zeroEscapeSequence();
+            if (result0 === null) {
+              result0 = parse_hexEscapeSequence();
+              if (result0 === null) {
+                result0 = parse_unicodeEscapeSequence();
+                if (result0 === null) {
+                  result0 = parse_eolEscapeSequence();
+                  
+                }
+              }
+            }
+          }
         }
         
         
@@ -2776,78 +2587,70 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2, pos3;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
-        var savedPos2 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
+        pos2 = pos;
         reportFailures++;
         if (input.substr(pos, 1) === "]") {
-          var result8 = "]";
+          result0 = "]";
           pos += 1;
         } else {
-          var result8 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"]\"");
           }
         }
-        if (result8 !== null) {
-          var result5 = result8;
-        } else {
+        if (result0 === null) {
           if (input.substr(pos, 1) === "\\") {
-            var result7 = "\\";
+            result0 = "\\";
             pos += 1;
           } else {
-            var result7 = null;
+            result0 = null;
             if (reportFailures === 0) {
               matchFailed("\"\\\\\"");
             }
           }
-          if (result7 !== null) {
-            var result5 = result7;
-          } else {
-            var result6 = parse_eolChar();
-            if (result6 !== null) {
-              var result5 = result6;
-            } else {
-              var result5 = null;;
-            };
-          };
+          if (result0 === null) {
+            result0 = parse_eolChar();
+            
+          }
         }
         reportFailures--;
-        if (result5 === null) {
-          var result3 = '';
+        if (result0 === null) {
+          result0 = '';
         } else {
-          var result3 = null;
-          pos = savedPos2;
+          result0 = null;
+          pos = pos2;
         }
-        if (result3 !== null) {
+        if (result0 !== null) {
           if (input.length > pos) {
-            var result4 = input.charAt(pos);
+            result1 = input.charAt(pos);
             pos++;
           } else {
-            var result4 = null;
+            result1 = null;
             if (reportFailures === 0) {
               matchFailed('any character');
             }
           }
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(char_) { return char_; })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(char_) { return char_; })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2867,91 +2670,84 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2, pos3;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "\\") {
-          var result3 = "\\";
+          result0 = "\\";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\\\"");
           }
         }
-        if (result3 !== null) {
-          var savedPos2 = pos;
+        if (result0 !== null) {
+          pos2 = pos;
           reportFailures++;
-          var result10 = parse_digit();
-          if (result10 !== null) {
-            var result6 = result10;
-          } else {
+          result1 = parse_digit();
+          if (result1 === null) {
             if (input.substr(pos, 1) === "x") {
-              var result9 = "x";
+              result1 = "x";
               pos += 1;
             } else {
-              var result9 = null;
+              result1 = null;
               if (reportFailures === 0) {
                 matchFailed("\"x\"");
               }
             }
-            if (result9 !== null) {
-              var result6 = result9;
-            } else {
+            if (result1 === null) {
               if (input.substr(pos, 1) === "u") {
-                var result8 = "u";
+                result1 = "u";
                 pos += 1;
               } else {
-                var result8 = null;
+                result1 = null;
                 if (reportFailures === 0) {
                   matchFailed("\"u\"");
                 }
               }
-              if (result8 !== null) {
-                var result6 = result8;
-              } else {
-                var result7 = parse_eolChar();
-                if (result7 !== null) {
-                  var result6 = result7;
-                } else {
-                  var result6 = null;;
-                };
-              };
-            };
+              if (result1 === null) {
+                result1 = parse_eolChar();
+                
+              }
+            }
           }
           reportFailures--;
-          if (result6 === null) {
-            var result4 = '';
+          if (result1 === null) {
+            result1 = '';
           } else {
-            var result4 = null;
-            pos = savedPos2;
+            result1 = null;
+            pos = pos2;
           }
-          if (result4 !== null) {
+          if (result1 !== null) {
             if (input.length > pos) {
-              var result5 = input.charAt(pos);
+              result2 = input.charAt(pos);
               pos++;
             } else {
-              var result5 = null;
+              result2 = null;
               if (reportFailures === 0) {
                 matchFailed('any character');
               }
             }
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(char_) {
+        if (result0 !== null) {
+          result0 = (function(char_) {
                 return char_
                   .replace("b", "\b")
                   .replace("f", "\f")
@@ -2959,13 +2755,10 @@ PEG.parser = (function(){
                   .replace("r", "\r")
                   .replace("t", "\t")
                   .replace("v", "\x0B") // IE does not recognize "\v".
-              })(result1[2])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[2]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -2985,47 +2778,47 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2, pos3;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 2) === "\\0") {
-          var result3 = "\\0";
+          result0 = "\\0";
           pos += 2;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\\0\"");
           }
         }
-        if (result3 !== null) {
-          var savedPos2 = pos;
+        if (result0 !== null) {
+          pos2 = pos;
           reportFailures++;
-          var result5 = parse_digit();
+          result1 = parse_digit();
           reportFailures--;
-          if (result5 === null) {
-            var result4 = '';
+          if (result1 === null) {
+            result1 = '';
           } else {
-            var result4 = null;
-            pos = savedPos2;
+            result1 = null;
+            pos = pos2;
           }
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function() { return "\0"; })()
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function() { return "\0"; })();
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -3045,46 +2838,46 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 2) === "\\x") {
-          var result3 = "\\x";
+          result0 = "\\x";
           pos += 2;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\\x\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse_hexDigit();
-          if (result4 !== null) {
-            var result5 = parse_hexDigit();
-            if (result5 !== null) {
-              var result1 = [result3, result4, result5];
+        if (result0 !== null) {
+          result1 = parse_hexDigit();
+          if (result1 !== null) {
+            result2 = parse_hexDigit();
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(h1, h2) {
+        if (result0 !== null) {
+          result0 = (function(h1, h2) {
                 return String.fromCharCode(parseInt("0x" + h1 + h2));
-              })(result1[1], result1[2])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[1], result0[2]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -3104,58 +2897,58 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4, result5;
+        var pos0, pos1, pos2;
+        
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 2) === "\\u") {
-          var result3 = "\\u";
+          result0 = "\\u";
           pos += 2;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\\u\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse_hexDigit();
-          if (result4 !== null) {
-            var result5 = parse_hexDigit();
-            if (result5 !== null) {
-              var result6 = parse_hexDigit();
-              if (result6 !== null) {
-                var result7 = parse_hexDigit();
-                if (result7 !== null) {
-                  var result1 = [result3, result4, result5, result6, result7];
+        if (result0 !== null) {
+          result1 = parse_hexDigit();
+          if (result1 !== null) {
+            result2 = parse_hexDigit();
+            if (result2 !== null) {
+              result3 = parse_hexDigit();
+              if (result3 !== null) {
+                result4 = parse_hexDigit();
+                if (result4 !== null) {
+                  result0 = [result0, result1, result2, result3, result4];
                 } else {
-                  var result1 = null;
-                  pos = savedPos1;
+                  result0 = null;
+                  pos = pos1;
                 }
               } else {
-                var result1 = null;
-                pos = savedPos1;
+                result0 = null;
+                pos = pos1;
               }
             } else {
-              var result1 = null;
-              pos = savedPos1;
+              result0 = null;
+              pos = pos1;
             }
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(h1, h2, h3, h4) {
+        if (result0 !== null) {
+          result0 = (function(h1, h2, h3, h4) {
                 return String.fromCharCode(parseInt("0x" + h1 + h2 + h3 + h4));
-              })(result1[1], result1[2], result1[3], result1[4])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+              })(result0[1], result0[2], result0[3], result0[4]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -3175,38 +2968,38 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2;
+        var pos0, pos1, pos2;
         
-        var savedPos0 = pos;
-        var savedPos1 = pos;
+        
+        pos0 = pos;
+        pos1 = pos;
         if (input.substr(pos, 1) === "\\") {
-          var result3 = "\\";
+          result0 = "\\";
           pos += 1;
         } else {
-          var result3 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\\\\"");
           }
         }
-        if (result3 !== null) {
-          var result4 = parse_eol();
-          if (result4 !== null) {
-            var result1 = [result3, result4];
+        if (result0 !== null) {
+          result1 = parse_eol();
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result1 = null;
-            pos = savedPos1;
+            result0 = null;
+            pos = pos1;
           }
         } else {
-          var result1 = null;
-          pos = savedPos1;
+          result0 = null;
+          pos = pos1;
         }
-        var result2 = result1 !== null
-          ? (function(eol) { return eol; })(result1[1])
-          : null;
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result0 = null;
-          pos = savedPos0;
+        if (result0 !== null) {
+          result0 = (function(eol) { return eol; })(result0[1]);
+        }
+        if (result0 === null) {
+          pos = pos0;
         }
         
         
@@ -3226,12 +3019,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         
         if (input.substr(pos).match(/^[0-9]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[0-9]");
           }
@@ -3254,12 +3050,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         
         if (input.substr(pos).match(/^[0-9a-fA-F]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[0-9a-fA-F]");
           }
@@ -3282,17 +3081,14 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
         
-        var result2 = parse_lowerCaseLetter();
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result1 = parse_upperCaseLetter();
-          if (result1 !== null) {
-            var result0 = result1;
-          } else {
-            var result0 = null;;
-          };
+        
+        result0 = parse_lowerCaseLetter();
+        if (result0 === null) {
+          result0 = parse_upperCaseLetter();
+          
         }
         
         
@@ -3312,12 +3108,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         
         if (input.substr(pos).match(/^[a-z]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[a-z]");
           }
@@ -3340,12 +3139,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         
         if (input.substr(pos).match(/^[A-Z]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[A-Z]");
           }
@@ -3368,41 +3170,28 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1;
+        var pos0;
         
-        var result0 = [];
-        var result4 = parse_whitespace();
-        if (result4 !== null) {
-          var result1 = result4;
-        } else {
-          var result3 = parse_eol();
-          if (result3 !== null) {
-            var result1 = result3;
-          } else {
-            var result2 = parse_comment();
-            if (result2 !== null) {
-              var result1 = result2;
-            } else {
-              var result1 = null;;
-            };
-          };
+        
+        result0 = [];
+        result1 = parse_whitespace();
+        if (result1 === null) {
+          result1 = parse_eol();
+          if (result1 === null) {
+            result1 = parse_comment();
+            
+          }
         }
         while (result1 !== null) {
           result0.push(result1);
-          var result4 = parse_whitespace();
-          if (result4 !== null) {
-            var result1 = result4;
-          } else {
-            var result3 = parse_eol();
-            if (result3 !== null) {
-              var result1 = result3;
-            } else {
-              var result2 = parse_comment();
-              if (result2 !== null) {
-                var result1 = result2;
-              } else {
-                var result1 = null;;
-              };
-            };
+          result1 = parse_whitespace();
+          if (result1 === null) {
+            result1 = parse_eol();
+            if (result1 === null) {
+              result1 = parse_comment();
+              
+            }
           }
         }
         
@@ -3423,17 +3212,14 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         reportFailures++;
-        var result2 = parse_singleLineComment();
-        if (result2 !== null) {
-          var result0 = result2;
-        } else {
-          var result1 = parse_multiLineComment();
-          if (result1 !== null) {
-            var result0 = result1;
-          } else {
-            var result0 = null;;
-          };
+        result0 = parse_singleLineComment();
+        if (result0 === null) {
+          result0 = parse_multiLineComment();
+          
         }
         reportFailures--;
         if (reportFailures === 0 && result0 === null) {
@@ -3455,93 +3241,96 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4, result5;
+        var pos0, pos1, pos2, pos3;
+        
         
-        var savedPos0 = pos;
+        pos0 = pos;
         if (input.substr(pos, 2) === "//") {
-          var result1 = "//";
+          result0 = "//";
           pos += 2;
         } else {
-          var result1 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"//\"");
           }
         }
-        if (result1 !== null) {
-          var result2 = [];
-          var savedPos1 = pos;
-          var savedPos2 = pos;
+        if (result0 !== null) {
+          result1 = [];
+          pos1 = pos;
+          pos2 = pos;
           reportFailures++;
-          var result6 = parse_eolChar();
+          result2 = parse_eolChar();
           reportFailures--;
-          if (result6 === null) {
-            var result4 = '';
+          if (result2 === null) {
+            result2 = '';
           } else {
-            var result4 = null;
-            pos = savedPos2;
+            result2 = null;
+            pos = pos2;
           }
-          if (result4 !== null) {
+          if (result2 !== null) {
             if (input.length > pos) {
-              var result5 = input.charAt(pos);
+              result3 = input.charAt(pos);
               pos++;
             } else {
-              var result5 = null;
+              result3 = null;
               if (reportFailures === 0) {
                 matchFailed('any character');
               }
             }
-            if (result5 !== null) {
-              var result3 = [result4, result5];
+            if (result3 !== null) {
+              result2 = [result2, result3];
             } else {
-              var result3 = null;
-              pos = savedPos1;
+              result2 = null;
+              pos = pos1;
             }
           } else {
-            var result3 = null;
-            pos = savedPos1;
+            result2 = null;
+            pos = pos1;
           }
-          while (result3 !== null) {
-            result2.push(result3);
-            var savedPos1 = pos;
-            var savedPos2 = pos;
+          while (result2 !== null) {
+            result1.push(result2);
+            pos1 = pos;
+            pos2 = pos;
             reportFailures++;
-            var result6 = parse_eolChar();
+            result2 = parse_eolChar();
             reportFailures--;
-            if (result6 === null) {
-              var result4 = '';
+            if (result2 === null) {
+              result2 = '';
             } else {
-              var result4 = null;
-              pos = savedPos2;
+              result2 = null;
+              pos = pos2;
             }
-            if (result4 !== null) {
+            if (result2 !== null) {
               if (input.length > pos) {
-                var result5 = input.charAt(pos);
+                result3 = input.charAt(pos);
                 pos++;
               } else {
-                var result5 = null;
+                result3 = null;
                 if (reportFailures === 0) {
                   matchFailed('any character');
                 }
               }
-              if (result5 !== null) {
-                var result3 = [result4, result5];
+              if (result3 !== null) {
+                result2 = [result2, result3];
               } else {
-                var result3 = null;
-                pos = savedPos1;
+                result2 = null;
+                pos = pos1;
               }
             } else {
-              var result3 = null;
-              pos = savedPos1;
+              result2 = null;
+              pos = pos1;
             }
           }
-          if (result2 !== null) {
-            var result0 = [result1, result2];
+          if (result1 !== null) {
+            result0 = [result0, result1];
           } else {
-            var result0 = null;
-            pos = savedPos0;
+            result0 = null;
+            pos = pos0;
           }
         } else {
-          var result0 = null;
-          pos = savedPos0;
+          result0 = null;
+          pos = pos0;
         }
         
         
@@ -3561,123 +3350,126 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0, result1, result2, result3, result4, result5;
+        var pos0, pos1, pos2, pos3;
         
-        var savedPos0 = pos;
+        
+        pos0 = pos;
         if (input.substr(pos, 2) === "/*") {
-          var result1 = "/*";
+          result0 = "/*";
           pos += 2;
         } else {
-          var result1 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"/*\"");
           }
         }
-        if (result1 !== null) {
-          var result2 = [];
-          var savedPos1 = pos;
-          var savedPos2 = pos;
+        if (result0 !== null) {
+          result1 = [];
+          pos1 = pos;
+          pos2 = pos;
           reportFailures++;
           if (input.substr(pos, 2) === "*/") {
-            var result7 = "*/";
+            result2 = "*/";
             pos += 2;
           } else {
-            var result7 = null;
+            result2 = null;
             if (reportFailures === 0) {
               matchFailed("\"*/\"");
             }
           }
           reportFailures--;
-          if (result7 === null) {
-            var result5 = '';
+          if (result2 === null) {
+            result2 = '';
           } else {
-            var result5 = null;
-            pos = savedPos2;
+            result2 = null;
+            pos = pos2;
           }
-          if (result5 !== null) {
+          if (result2 !== null) {
             if (input.length > pos) {
-              var result6 = input.charAt(pos);
+              result3 = input.charAt(pos);
               pos++;
             } else {
-              var result6 = null;
+              result3 = null;
               if (reportFailures === 0) {
                 matchFailed('any character');
               }
             }
-            if (result6 !== null) {
-              var result4 = [result5, result6];
+            if (result3 !== null) {
+              result2 = [result2, result3];
             } else {
-              var result4 = null;
-              pos = savedPos1;
+              result2 = null;
+              pos = pos1;
             }
           } else {
-            var result4 = null;
-            pos = savedPos1;
+            result2 = null;
+            pos = pos1;
           }
-          while (result4 !== null) {
-            result2.push(result4);
-            var savedPos1 = pos;
-            var savedPos2 = pos;
+          while (result2 !== null) {
+            result1.push(result2);
+            pos1 = pos;
+            pos2 = pos;
             reportFailures++;
             if (input.substr(pos, 2) === "*/") {
-              var result7 = "*/";
+              result2 = "*/";
               pos += 2;
             } else {
-              var result7 = null;
+              result2 = null;
               if (reportFailures === 0) {
                 matchFailed("\"*/\"");
               }
             }
             reportFailures--;
-            if (result7 === null) {
-              var result5 = '';
+            if (result2 === null) {
+              result2 = '';
             } else {
-              var result5 = null;
-              pos = savedPos2;
+              result2 = null;
+              pos = pos2;
             }
-            if (result5 !== null) {
+            if (result2 !== null) {
               if (input.length > pos) {
-                var result6 = input.charAt(pos);
+                result3 = input.charAt(pos);
                 pos++;
               } else {
-                var result6 = null;
+                result3 = null;
                 if (reportFailures === 0) {
                   matchFailed('any character');
                 }
               }
-              if (result6 !== null) {
-                var result4 = [result5, result6];
+              if (result3 !== null) {
+                result2 = [result2, result3];
               } else {
-                var result4 = null;
-                pos = savedPos1;
+                result2 = null;
+                pos = pos1;
               }
             } else {
-              var result4 = null;
-              pos = savedPos1;
+              result2 = null;
+              pos = pos1;
             }
           }
-          if (result2 !== null) {
+          if (result1 !== null) {
             if (input.substr(pos, 2) === "*/") {
-              var result3 = "*/";
+              result2 = "*/";
               pos += 2;
             } else {
-              var result3 = null;
+              result2 = null;
               if (reportFailures === 0) {
                 matchFailed("\"*/\"");
               }
             }
-            if (result3 !== null) {
-              var result0 = [result1, result2, result3];
+            if (result2 !== null) {
+              result0 = [result0, result1, result2];
             } else {
-              var result0 = null;
-              pos = savedPos0;
+              result0 = null;
+              pos = pos0;
             }
           } else {
-            var result0 = null;
-            pos = savedPos0;
+            result0 = null;
+            pos = pos0;
           }
         } else {
-          var result0 = null;
-          pos = savedPos0;
+          result0 = null;
+          pos = pos0;
         }
         
         
@@ -3697,72 +3489,63 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         reportFailures++;
         if (input.substr(pos, 1) === "\n") {
-          var result5 = "\n";
+          result0 = "\n";
           pos += 1;
         } else {
-          var result5 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("\"\\n\"");
           }
         }
-        if (result5 !== null) {
-          var result0 = result5;
-        } else {
+        if (result0 === null) {
           if (input.substr(pos, 2) === "\r\n") {
-            var result4 = "\r\n";
+            result0 = "\r\n";
             pos += 2;
           } else {
-            var result4 = null;
+            result0 = null;
             if (reportFailures === 0) {
               matchFailed("\"\\r\\n\"");
             }
           }
-          if (result4 !== null) {
-            var result0 = result4;
-          } else {
+          if (result0 === null) {
             if (input.substr(pos, 1) === "\r") {
-              var result3 = "\r";
+              result0 = "\r";
               pos += 1;
             } else {
-              var result3 = null;
+              result0 = null;
               if (reportFailures === 0) {
                 matchFailed("\"\\r\"");
               }
             }
-            if (result3 !== null) {
-              var result0 = result3;
-            } else {
+            if (result0 === null) {
               if (input.substr(pos, 1) === "\u2028") {
-                var result2 = "\u2028";
+                result0 = "\u2028";
                 pos += 1;
               } else {
-                var result2 = null;
+                result0 = null;
                 if (reportFailures === 0) {
                   matchFailed("\"\\u2028\"");
                 }
               }
-              if (result2 !== null) {
-                var result0 = result2;
-              } else {
+              if (result0 === null) {
                 if (input.substr(pos, 1) === "\u2029") {
-                  var result1 = "\u2029";
+                  result0 = "\u2029";
                   pos += 1;
                 } else {
-                  var result1 = null;
+                  result0 = null;
                   if (reportFailures === 0) {
                     matchFailed("\"\\u2029\"");
                   }
                 }
-                if (result1 !== null) {
-                  var result0 = result1;
-                } else {
-                  var result0 = null;;
-                };
-              };
-            };
-          };
+                
+              }
+            }
+          }
         }
         reportFailures--;
         if (reportFailures === 0 && result0 === null) {
@@ -3784,12 +3567,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         
         if (input.substr(pos).match(/^[\n\r\u2028\u2029]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[\\n\\r\\u2028\\u2029]");
           }
@@ -3812,12 +3598,15 @@ PEG.parser = (function(){
           return cachedResult.result;
         }
         
+        var result0;
+        var pos0;
+        
         reportFailures++;
         if (input.substr(pos).match(/^[ 	\xA0\uFEFF\u1680\u180E\u2000-\u200A\u202F\u205F\u3000]/) !== null) {
-          var result0 = input.charAt(pos);
+          result0 = input.charAt(pos);
           pos++;
         } else {
-          var result0 = null;
+          result0 = null;
           if (reportFailures === 0) {
             matchFailed("[ 	\\xA0\\uFEFF\\u1680\\u180E\\u2000-\\u200A\\u202F\\u205F\\u3000]");
           }
diff --git a/src/passes.js b/src/passes.js
index 4b8ef91..a91e505 100644
--- a/src/passes.js
+++ b/src/passes.js
@@ -75,6 +75,82 @@ PEG.compiler.passes = {
       }
     }
 
+    return ast;
+  },
+
+  /*
+   * Adds |resultStackDepth| and |posStackDepth| properties to each AST node.
+   * These properties specify how many positions on the result or position stack
+   * code generated by the emitter for the node will use. This information is
+   * used to declare varibles holding the stack data in the generated code.
+   */
+  stackDepths: function(ast) {
+    function computeZeroes(node) {
+      node.resultStackDepth = 0;
+      node.posStackDepth = 0;
+    }
+
+    function computeFromExpression(resultStackDelta, posStackDelta) {
+      return function(node) {
+        compute(node.expression);
+        node.resultStackDepth = node.expression.resultStackDepth + resultStackDelta;
+        node.posStackDepth    = node.expression.posStackDepth    + posStackDelta;
+      }
+    }
+
+    var compute = buildNodeVisitor({
+      grammar:
+        function(node) {
+          for (var name in node.rules) {
+            compute(node.rules[name]);
+          }
+        },
+
+      rule:         computeFromExpression(1, 1),
+
+      choice:
+        function(node) {
+          each(node.alternatives, compute);
+          node.resultStackDepth = Math.max.apply(
+            null,
+            map(node.alternatives, function(e) { return e.resultStackDepth; })
+          );
+          node.posStackDepth = Math.max.apply(
+            null,
+            map(node.alternatives, function(e) { return e.posStackDepth; })
+          );
+        },
+
+      sequence:
+        function(node) {
+          each(node.elements, compute);
+          node.resultStackDepth = 1 + Math.max.apply(
+            null,
+            map(node.elements, function(e, i) { return i + e.resultStackDepth; })
+          );
+          node.posStackDepth = 1 + Math.max.apply(
+            null,
+            map(node.elements, function(e) { return e.posStackDepth; })
+          );
+        },
+
+      labeled:      computeFromExpression(0, 0),
+      simple_and:   computeFromExpression(0, 1),
+      simple_not:   computeFromExpression(0, 1),
+      semantic_and: computeZeroes,
+      semantic_not: computeZeroes,
+      optional:     computeFromExpression(0, 0),
+      zero_or_more: computeFromExpression(1, 0),
+      one_or_more:  computeFromExpression(1, 0),
+      action:       computeFromExpression(0, 1),
+      rule_ref:     computeZeroes,
+      literal:      computeZeroes,
+      any:          computeZeroes,
+      "class":      computeZeroes
+    });
+
+    compute(ast);
+
     return ast;
   }
 };
diff --git a/src/utils.js b/src/utils.js
index 1057326..f659e74 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,3 +1,17 @@
+/* Like Python's |range|, but without |step|. */
+function range(start, stop) {
+  if (stop === undefined) {
+    stop = start;
+    start = 0;
+  }
+
+  var result = new Array(Math.max(0, stop - start));
+  for (var i = 0, j = start; j < stop; i++, j++) {
+    result[i] = j;
+  }
+  return result;
+}
+
 function contains(array, value) {
   /*
    * Stupid IE does not have Array.prototype.indexOf, otherwise this function
@@ -15,7 +29,7 @@ function contains(array, value) {
 function each(array, callback) {
   var length = array.length;
   for (var i = 0; i < length; i++) {
-    callback(array[i]);
+    callback(array[i], i);
   }
 }
 
@@ -23,7 +37,7 @@ function map(array, callback) {
   var result = [];
   var length = array.length;
   for (var i = 0; i < length; i++) {
-    result[i] = callback(array[i]);
+    result[i] = callback(array[i], i);
   }
   return result;
 }
diff --git a/test/passes-test.js b/test/passes-test.js
index 4ae423f..054cad3 100644
--- a/test/passes-test.js
+++ b/test/passes-test.js
@@ -147,4 +147,90 @@ test("removes proxy rules", function() {
   }
 });
 
+test("computes stack depths", function() {
+  var cases = [
+    /* Choice */
+    {
+      grammar:          'start = "a" / "b" / "c"',
+      resultStackDepth: 1,
+      posStackDepth:    1
+    },
+    {
+      grammar:          'start = "a" / "b"* / "c"',
+      resultStackDepth: 2,
+      posStackDepth:    1
+    },
+    {
+      grammar:          'start = "a" / &"b" / "c"',
+      resultStackDepth: 1,
+      posStackDepth:    2
+    },
+
+    /* Sequence */
+    {
+      grammar:          'start = "a" "b" "c"',
+      resultStackDepth: 4,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = "a" "b" "c"*',
+      resultStackDepth: 5,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = "a" "b"* "c"',
+      resultStackDepth: 4,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = "a" ("b"*)* "c"',
+      resultStackDepth: 5,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = "a"* "b" "c"',
+      resultStackDepth: 4,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = ("a"*)* "b" "c"',
+      resultStackDepth: 4,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = (("a"*)*)* "b" "c"',
+      resultStackDepth: 5,
+      posStackDepth:    2
+    },
+    {
+      grammar:          'start = "a" &"b" "c"',
+      resultStackDepth: 4,
+      posStackDepth:    3
+    },
+
+    /* Others */
+    { grammar: 'start = label:"a"',    resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = &"a"',         resultStackDepth: 1, posStackDepth: 2 },
+    { grammar: 'start = !"a"',         resultStackDepth: 1, posStackDepth: 2 },
+    { grammar: 'start = &{ code }',    resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = !{ code }',    resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = "a"?',         resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = "a"*',         resultStackDepth: 2, posStackDepth: 1 },
+    { grammar: 'start = "a"+',         resultStackDepth: 2, posStackDepth: 1 },
+    { grammar: 'start = "a" { code }', resultStackDepth: 1, posStackDepth: 2 },
+    { grammar: 'start = a',            resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = "a"',          resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = .',            resultStackDepth: 1, posStackDepth: 1 },
+    { grammar: 'start = [a-z]',        resultStackDepth: 1, posStackDepth: 1 }
+  ];
+
+  for (var i = 0; i < cases.length; i++) {
+    var ast = PEG.parser.parse(cases[i].grammar);
+    PEG.compiler.passes.stackDepths(ast)
+
+    deepEqual(ast.rules["start"].resultStackDepth, cases[i].resultStackDepth);
+    deepEqual(ast.rules["start"].posStackDepth,    cases[i].posStackDepth);
+  }
+});
+
 })();