Mark |parse| and |SyntaxError| as internal identifiers

The |parse| function and the |SyntaxError| exception were meant as
internal, so let's mark them as such.

lib/compiler/passes/generate-javascript.js

@@ -677,7 +677,7 @@ module.exports = function(ast, options) {
     '    child.prototype = new ctor();',
     '  }',
     '',
-    '  function SyntaxError(message, expected, found, offset, line, column) {',
+    '  function peg$SyntaxError(message, expected, found, offset, line, column) {',
     '    this.message  = message;',
     '    this.expected = expected;',
     '    this.found    = found;',
@@ -688,9 +688,9 @@ module.exports = function(ast, options) {
     '    this.name     = "SyntaxError";',
     '  }',
     '',
-    '  peg$subclass(SyntaxError, Error);',
+    '  peg$subclass(peg$SyntaxError, Error);',
     '',
-    '  function parse(input) {',
+    '  function peg$parse(input) {',
     '    var options = arguments.length > 1 ? arguments[1] : {},',
     '',
     '        peg$FAILED = {},',
@@ -927,7 +927,7 @@ module.exports = function(ast, options) {
     '        cleanupExpected(expected);',
     '      }',
     '',
-    '      return new SyntaxError(',
+    '      return new peg$SyntaxError(',
     '        message !== null ? message : buildMessage(expected, found),',
     '        expected,',
     '        found,',
@@ -974,8 +974,8 @@ module.exports = function(ast, options) {
     '  }',
     '',
     '  return {',
-    '    SyntaxError: SyntaxError,',
-    '    parse:       parse',
+    '    SyntaxError: peg$SyntaxError,',
+    '    parse:       peg$parse',
     '  };',
     '})()'
   ].join('\n'));

lib/parser.js

@@ -11,7 +11,7 @@ module.exports = (function() {
     child.prototype = new ctor();
   }
 
-  function SyntaxError(message, expected, found, offset, line, column) {
+  function peg$SyntaxError(message, expected, found, offset, line, column) {
     this.message  = message;
     this.expected = expected;
     this.found    = found;
@@ -22,9 +22,9 @@ module.exports = (function() {
     this.name     = "SyntaxError";
   }
 
-  peg$subclass(SyntaxError, Error);
+  peg$subclass(peg$SyntaxError, Error);
 
-  function parse(input) {
+  function peg$parse(input) {
     var options = arguments.length > 1 ? arguments[1] : {},
 
         peg$FAILED = {},
@@ -493,7 +493,7 @@ module.exports = (function() {
         cleanupExpected(expected);
       }
 
-      return new SyntaxError(
+      return new peg$SyntaxError(
         message !== null ? message : buildMessage(expected, found),
         expected,
         found,
@@ -4898,7 +4898,7 @@ module.exports = (function() {
   }
 
   return {
-    SyntaxError: SyntaxError,
-    parse:       parse
+    SyntaxError: peg$SyntaxError,
+    parse:       peg$parse
   };
 })();