Guard against redefinition of |undefined|
In most cases, code pattern x === undefined was transformed to typeof(x) === "undefined" and similarly with |!==|. In the generated code, the condition was simply made less strict to avoid performance penalty of string comparison (I don't think JavaScript VMs optimize this specific pattern to avoid it).
This commit is contained in:
David Majda
parent
d85bfcb2e9
commit
4e968892be
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@ -45,7 +45,7 @@ PEG.GrammarError.prototype = Error.prototype;
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PEG.ArrayUtils = {
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/* Like Python's |range|, but without |step|. */
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range: function(start, stop) {
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if (stop === undefined) {
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if (typeof(stop) === "undefined") {
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stop = start;
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start = 0;
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}
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@ -199,11 +199,11 @@ PEG.Compiler = {
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/\$\{([a-zA-Z_][a-zA-Z0-9_]*)(\|([a-zA-Z_][a-zA-Z0-9_]*))?\}/g,
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function(match, name, dummy, filter) {
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var value = vars[name];
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if (value === undefined) {
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if (typeof(value) === "undefined") {
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throw new Error("Undefined variable: \"" + name + "\".");
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}
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if (filter !== undefined && filter != "") { // JavaScript engines differ here.
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if (typeof(filter) !== "undefined" && filter != "") { // JavaScript engines differ here.
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if (filter === "string") {
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return PEG.StringUtils.quote(value);
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} else {
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@ -284,7 +284,7 @@ PEG.Compiler = {
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rule_ref:
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function(node) {
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if (ast[node.name] === undefined) {
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if (typeof(ast[node.name]) === "undefined") {
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throw new PEG.GrammarError(
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"Referenced rule \"" + node.name + "\" does not exist."
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);
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@ -305,7 +305,7 @@ PEG.Compiler = {
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/* Checks that the start rule is defined. */
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function(ast, startRule) {
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if (ast[startRule] === undefined) {
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if (typeof(ast[startRule]) === "undefined") {
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throw new PEG.GrammarError(
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"Missing \"" + startRule + "\" rule."
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);
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@ -403,7 +403,7 @@ PEG.Compiler = {
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"_parse_${name}: function(context) {",
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" var cacheKey = ${name|string} + '@' + this._pos;",
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" var cachedResult = this._cache[cacheKey];",
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" if (cachedResult !== undefined) {",
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" if (cachedResult) {",
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" this._pos = cachedResult.nextPos;",
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" return cachedResult.result;",
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" }",
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@ -49,7 +49,7 @@ PEG.grammarParser = (function(){
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_parse_grammar: function(context) {
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var cacheKey = "grammar" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -100,7 +100,7 @@ PEG.grammarParser = (function(){
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_parse_rule: function(context) {
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var cacheKey = "rule" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -175,7 +175,7 @@ PEG.grammarParser = (function(){
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_parse_expression: function(context) {
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var cacheKey = "expression" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -197,7 +197,7 @@ PEG.grammarParser = (function(){
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_parse_choice: function(context) {
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var cacheKey = "choice" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -279,7 +279,7 @@ PEG.grammarParser = (function(){
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_parse_sequence: function(context) {
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var cacheKey = "sequence" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -359,7 +359,7 @@ PEG.grammarParser = (function(){
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_parse_prefixed: function(context) {
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var cacheKey = "prefixed" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -428,7 +428,7 @@ PEG.grammarParser = (function(){
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_parse_suffixed: function(context) {
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var cacheKey = "suffixed" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -518,7 +518,7 @@ PEG.grammarParser = (function(){
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_parse_primary: function(context) {
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var cacheKey = "primary" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -653,7 +653,7 @@ PEG.grammarParser = (function(){
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_parse_action: function(context) {
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var cacheKey = "action" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -694,7 +694,7 @@ PEG.grammarParser = (function(){
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_parse_braced: function(context) {
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var cacheKey = "braced" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -779,7 +779,7 @@ PEG.grammarParser = (function(){
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_parse_nonBraceCharacters: function(context) {
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var cacheKey = "nonBraceCharacters" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -813,7 +813,7 @@ PEG.grammarParser = (function(){
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_parse_nonBraceCharacter: function(context) {
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var cacheKey = "nonBraceCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -846,7 +846,7 @@ PEG.grammarParser = (function(){
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_parse_colon: function(context) {
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var cacheKey = "colon" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -892,7 +892,7 @@ PEG.grammarParser = (function(){
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_parse_slash: function(context) {
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var cacheKey = "slash" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -938,7 +938,7 @@ PEG.grammarParser = (function(){
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_parse_and: function(context) {
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var cacheKey = "and" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -984,7 +984,7 @@ PEG.grammarParser = (function(){
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_parse_not: function(context) {
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var cacheKey = "not" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1030,7 +1030,7 @@ PEG.grammarParser = (function(){
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_parse_question: function(context) {
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var cacheKey = "question" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1076,7 +1076,7 @@ PEG.grammarParser = (function(){
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_parse_star: function(context) {
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var cacheKey = "star" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1122,7 +1122,7 @@ PEG.grammarParser = (function(){
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_parse_plus: function(context) {
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var cacheKey = "plus" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1168,7 +1168,7 @@ PEG.grammarParser = (function(){
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_parse_lparen: function(context) {
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var cacheKey = "lparen" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1214,7 +1214,7 @@ PEG.grammarParser = (function(){
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_parse_rparen: function(context) {
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var cacheKey = "rparen" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1260,7 +1260,7 @@ PEG.grammarParser = (function(){
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_parse_dot: function(context) {
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var cacheKey = "dot" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1306,7 +1306,7 @@ PEG.grammarParser = (function(){
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_parse_identifier: function(context) {
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var cacheKey = "identifier" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1463,7 +1463,7 @@ PEG.grammarParser = (function(){
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_parse_literal: function(context) {
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var cacheKey = "literal" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1514,7 +1514,7 @@ PEG.grammarParser = (function(){
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_parse_doubleQuotedLiteral: function(context) {
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var cacheKey = "doubleQuotedLiteral" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1579,7 +1579,7 @@ PEG.grammarParser = (function(){
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_parse_doubleQuotedCharacter: function(context) {
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var cacheKey = "doubleQuotedCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1631,7 +1631,7 @@ PEG.grammarParser = (function(){
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_parse_simpleDoubleQuotedCharacter: function(context) {
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var cacheKey = "simpleDoubleQuotedCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1718,7 +1718,7 @@ PEG.grammarParser = (function(){
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_parse_singleQuotedLiteral: function(context) {
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var cacheKey = "singleQuotedLiteral" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1783,7 +1783,7 @@ PEG.grammarParser = (function(){
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_parse_singleQuotedCharacter: function(context) {
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var cacheKey = "singleQuotedCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1835,7 +1835,7 @@ PEG.grammarParser = (function(){
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_parse_simpleSingleQuotedCharacter: function(context) {
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var cacheKey = "simpleSingleQuotedCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -1922,7 +1922,7 @@ PEG.grammarParser = (function(){
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_parse_class: function(context) {
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var cacheKey = "class" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2033,7 +2033,7 @@ PEG.grammarParser = (function(){
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_parse_classCharacterRange: function(context) {
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var cacheKey = "classCharacterRange" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2099,7 +2099,7 @@ PEG.grammarParser = (function(){
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_parse_classCharacter: function(context) {
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var cacheKey = "classCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2126,7 +2126,7 @@ PEG.grammarParser = (function(){
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_parse_bracketDelimitedCharacter: function(context) {
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var cacheKey = "bracketDelimitedCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2178,7 +2178,7 @@ PEG.grammarParser = (function(){
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_parse_simpleBracketDelimitedCharacter: function(context) {
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var cacheKey = "simpleBracketDelimitedCharacter" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2265,7 +2265,7 @@ PEG.grammarParser = (function(){
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_parse_simpleEscapeSequence: function(context) {
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var cacheKey = "simpleEscapeSequence" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2379,7 +2379,7 @@ PEG.grammarParser = (function(){
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_parse_zeroEscapeSequence: function(context) {
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var cacheKey = "zeroEscapeSequence" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2435,7 +2435,7 @@ PEG.grammarParser = (function(){
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_parse_hexEscapeSequence: function(context) {
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var cacheKey = "hexEscapeSequence" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2489,7 +2489,7 @@ PEG.grammarParser = (function(){
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_parse_unicodeEscapeSequence: function(context) {
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var cacheKey = "unicodeEscapeSequence" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
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return cachedResult.result;
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}
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@ -2555,7 +2555,7 @@ PEG.grammarParser = (function(){
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_parse_eolEscapeSequence: function(context) {
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var cacheKey = "eolEscapeSequence" + '@' + this._pos;
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var cachedResult = this._cache[cacheKey];
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if (cachedResult !== undefined) {
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if (cachedResult) {
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this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2601,7 +2601,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_digit: function(context) {
|
||||
var cacheKey = "digit" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2631,7 +2631,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_hexDigit: function(context) {
|
||||
var cacheKey = "hexDigit" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2661,7 +2661,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_letter: function(context) {
|
||||
var cacheKey = "letter" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2693,7 +2693,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_lowerCaseLetter: function(context) {
|
||||
var cacheKey = "lowerCaseLetter" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2723,7 +2723,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_upperCaseLetter: function(context) {
|
||||
var cacheKey = "upperCaseLetter" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2753,7 +2753,7 @@ PEG.grammarParser = (function(){
|
|||
_parse___: function(context) {
|
||||
var cacheKey = "__" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2810,7 +2810,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_comment: function(context) {
|
||||
var cacheKey = "comment" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2845,7 +2845,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_singleLineComment: function(context) {
|
||||
var cacheKey = "singleLineComment" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -2955,7 +2955,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_multiLineComment: function(context) {
|
||||
var cacheKey = "multiLineComment" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -3095,7 +3095,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_eol: function(context) {
|
||||
var cacheKey = "eol" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -3185,7 +3185,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_eolChar: function(context) {
|
||||
var cacheKey = "eolChar" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
@ -3215,7 +3215,7 @@ PEG.grammarParser = (function(){
|
|||
_parse_whitespace: function(context) {
|
||||
var cacheKey = "whitespace" + '@' + this._pos;
|
||||
var cachedResult = this._cache[cacheKey];
|
||||
if (cachedResult !== undefined) {
|
||||
if (cachedResult) {
|
||||
this._pos = cachedResult.nextPos;
|
||||
return cachedResult.result;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue