From f2f88b87ea04931105799243378116b777bfa5e7 Mon Sep 17 00:00:00 2001 From: David Majda Date: Mon, 5 Mar 2012 20:43:43 +0100 Subject: [PATCH] Make current parse position visible in actions and predicates The speed/size impact is insignificant. Speed impact ------------ Before: 214.11 kB/s After: 214.87 kB/s Difference: 0.35% Size impact ----------- Before: 1042691 b After: 1046731 b Difference: 0.38% (Measured by /tools/impact with Node.js v0.6.6 on x86_64 GNU/Linux.) --- src/emitter.js | 6 +- src/parser.js | 144 +++++++++++++++++++++--------------------- test/compiler-test.js | 100 +++++++++++++++++++---------- 3 files changed, 140 insertions(+), 110 deletions(-) diff --git a/src/emitter.js b/src/emitter.js index ada2092..5270066 100644 --- a/src/emitter.js +++ b/src/emitter.js @@ -565,10 +565,10 @@ PEG.compiler.emitter = function(ast) { '}' ], semantic_and: [ - '#{node.resultVar} = (function(#{keys(node.params).join(", ")}) {#{node.code}})(#{values(node.params).join(", ")}) ? "" : null;' + '#{node.resultVar} = (function(#{["offset"].concat(keys(node.params)).join(", ")}) {#{node.code}})(#{["pos"].concat(values(node.params)).join(", ")}) ? "" : null;' ], semantic_not: [ - '#{node.resultVar} = (function(#{keys(node.params).join(", ")}) {#{node.code}})(#{values(node.params).join(", ")}) ? null : "";' + '#{node.resultVar} = (function(#{["offset"].concat(keys(node.params)).join(", ")}) {#{node.code}})(#{["pos"].concat(values(node.params)).join(", ")}) ? null : "";' ], optional: [ '#block emit(node.expression)', @@ -598,7 +598,7 @@ PEG.compiler.emitter = function(ast) { '#{node.posVar} = pos;', '#block emit(node.expression)', 'if (#{node.resultVar} !== null) {', - ' #{node.resultVar} = (function(#{keys(node.params).join(", ")}) {#{node.code}})(#{values(node.params).join(", ")});', + ' #{node.resultVar} = (function(#{["offset"].concat(keys(node.params)).join(", ")}) {#{node.code}})(#{[node.posVar].concat(values(node.params)).join(", ")});', '}', 'if (#{node.resultVar} === null) {', ' pos = #{node.posVar};', diff --git a/src/parser.js b/src/parser.js index d76f4ab..41a925d 100644 --- a/src/parser.js +++ b/src/parser.js @@ -188,14 +188,14 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(initializer, rules) { + result0 = (function(offset, initializer, rules) { return { type: "grammar", initializer: initializer !== "" ? initializer : null, rules: rules, startRule: rules[0].name }; - })(result0[1], result0[2]); + })(pos0, result0[1], result0[2]); } if (result0 === null) { pos = pos0; @@ -236,12 +236,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(code) { + result0 = (function(offset, code) { return { type: "initializer", code: code }; - })(result0[0]); + })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -301,14 +301,14 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(name, displayName, expression) { + result0 = (function(offset, name, displayName, expression) { return { type: "rule", name: name, displayName: displayName !== "" ? displayName : null, expression: expression }; - })(result0[0], result0[1], result0[3]); + })(pos0, result0[0], result0[1], result0[3]); } if (result0 === null) { pos = pos0; @@ -379,7 +379,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(head, tail) { + result0 = (function(offset, head, tail) { if (tail.length > 0) { var alternatives = [head].concat(map( tail, @@ -392,7 +392,7 @@ PEG.parser = (function(){ } else { return head; } - })(result0[0], result0[1]); + })(pos0, result0[0], result0[1]); } if (result0 === null) { pos = pos0; @@ -437,7 +437,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(elements, code) { + result0 = (function(offset, elements, code) { var expression = elements.length !== 1 ? { type: "sequence", @@ -449,7 +449,7 @@ PEG.parser = (function(){ expression: expression, code: code }; - })(result0[0], result0[1]); + })(pos0, result0[0], result0[1]); } if (result0 === null) { pos = pos0; @@ -463,14 +463,14 @@ PEG.parser = (function(){ result1 = parse_labeled(); } if (result0 !== null) { - result0 = (function(elements) { + result0 = (function(offset, elements) { return elements.length !== 1 ? { type: "sequence", elements: elements } : elements[0]; - })(result0); + })(pos0, result0); } if (result0 === null) { pos = pos0; @@ -517,13 +517,13 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(label, expression) { + result0 = (function(offset, label, expression) { return { type: "labeled", label: label, expression: expression }; - })(result0[0], result0[2]); + })(pos0, result0[0], result0[2]); } if (result0 === null) { pos = pos0; @@ -566,12 +566,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(code) { + result0 = (function(offset, code) { return { type: "semantic_and", code: code }; - })(result0[1]); + })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -593,12 +593,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(expression) { + result0 = (function(offset, expression) { return { type: "simple_and", expression: expression }; - })(result0[1]); + })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -620,12 +620,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(code) { + result0 = (function(offset, code) { return { type: "semantic_not", code: code }; - })(result0[1]); + })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -647,12 +647,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(expression) { + result0 = (function(offset, expression) { return { type: "simple_not", expression: expression }; - })(result0[1]); + })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -698,12 +698,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(expression) { + result0 = (function(offset, expression) { return { type: "optional", expression: expression }; - })(result0[0]); + })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -725,12 +725,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(expression) { + result0 = (function(offset, expression) { return { type: "zero_or_more", expression: expression }; - })(result0[0]); + })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -752,12 +752,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(expression) { + result0 = (function(offset, expression) { return { type: "one_or_more", expression: expression }; - })(result0[0]); + })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -825,12 +825,12 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(name) { + result0 = (function(offset, name) { return { type: "rule_ref", name: name }; - })(result0[0]); + })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -841,7 +841,7 @@ PEG.parser = (function(){ pos0 = pos; result0 = parse_dot(); if (result0 !== null) { - result0 = (function() { return { type: "any" }; })(); + result0 = (function(offset) { return { type: "any" }; })(pos0); } if (result0 === null) { pos = pos0; @@ -871,7 +871,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(expression) { return expression; })(result0[1]); + result0 = (function(offset, expression) { return expression; })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -916,7 +916,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(braced) { return braced.substr(1, braced.length - 2); })(result0[0]); + result0 = (function(offset, braced) { return braced.substr(1, braced.length - 2); })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -993,9 +993,9 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(parts) { + result0 = (function(offset, parts) { return "{" + parts.join("") + "}"; - })(result0[1]); + })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -1031,7 +1031,7 @@ PEG.parser = (function(){ result0 = null; } if (result0 !== null) { - result0 = (function(chars) { return chars.join(""); })(result0); + result0 = (function(offset, chars) { return chars.join(""); })(pos0, result0); } if (result0 === null) { pos = pos0; @@ -1106,7 +1106,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "="; })(); + result0 = (function(offset) { return "="; })(pos0); } if (result0 === null) { pos = pos0; @@ -1154,7 +1154,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return ":"; })(); + result0 = (function(offset) { return ":"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1202,7 +1202,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return ";"; })(); + result0 = (function(offset) { return ";"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1250,7 +1250,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "/"; })(); + result0 = (function(offset) { return "/"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1298,7 +1298,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "&"; })(); + result0 = (function(offset) { return "&"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1346,7 +1346,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "!"; })(); + result0 = (function(offset) { return "!"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1394,7 +1394,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "?"; })(); + result0 = (function(offset) { return "?"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1442,7 +1442,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "*"; })(); + result0 = (function(offset) { return "*"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1490,7 +1490,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "+"; })(); + result0 = (function(offset) { return "+"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1538,7 +1538,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "("; })(); + result0 = (function(offset) { return "("; })(pos0); } if (result0 === null) { pos = pos0; @@ -1586,7 +1586,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return ")"; })(); + result0 = (function(offset) { return ")"; })(pos0); } if (result0 === null) { pos = pos0; @@ -1634,7 +1634,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "."; })(); + result0 = (function(offset) { return "."; })(pos0); } if (result0 === null) { pos = pos0; @@ -1758,9 +1758,9 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(head, tail) { + result0 = (function(offset, head, tail) { return head + tail.join(""); - })(result0[0], result0[1]); + })(pos0, result0[0], result0[1]); } if (result0 === null) { pos = pos0; @@ -1823,13 +1823,13 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(value, flags) { + result0 = (function(offset, value, flags) { return { type: "literal", value: value, ignoreCase: flags === "i" }; - })(result0[0], result0[1]); + })(pos0, result0[0], result0[1]); } if (result0 === null) { pos = pos0; @@ -1877,7 +1877,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(string) { return string; })(result0[0]); + result0 = (function(offset, string) { return string; })(pos0, result0[0]); } if (result0 === null) { pos = pos0; @@ -1948,7 +1948,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(chars) { return chars.join(""); })(result0[1]); + result0 = (function(offset, chars) { return chars.join(""); })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -2061,7 +2061,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(char_) { return char_; })(result0[1]); + result0 = (function(offset, char_) { return char_; })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -2128,7 +2128,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(chars) { return chars.join(""); })(result0[1]); + result0 = (function(offset, chars) { return chars.join(""); })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -2241,7 +2241,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(char_) { return char_; })(result0[1]); + result0 = (function(offset, char_) { return char_; })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -2351,7 +2351,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(inverted, parts, flags) { + result0 = (function(offset, inverted, parts, flags) { var partsConverted = map(parts, function(part) { return part.data; }); var rawText = "[" + inverted @@ -2367,7 +2367,7 @@ PEG.parser = (function(){ // FIXME: Get the raw text from the input directly. rawText: rawText }; - })(result0[1], result0[2], result0[4]); + })(pos0, result0[1], result0[2], result0[4]); } if (result0 === null) { pos = pos0; @@ -2425,7 +2425,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(begin, end) { + result0 = (function(offset, begin, end) { if (begin.data.charCodeAt(0) > end.data.charCodeAt(0)) { throw new this.SyntaxError( "Invalid character range: " + begin.rawText + "-" + end.rawText + "." @@ -2437,7 +2437,7 @@ PEG.parser = (function(){ // FIXME: Get the raw text from the input directly. rawText: begin.rawText + "-" + end.rawText }; - })(result0[0], result0[2]); + })(pos0, result0[0], result0[2]); } if (result0 === null) { pos = pos0; @@ -2464,13 +2464,13 @@ PEG.parser = (function(){ pos0 = pos; result0 = parse_bracketDelimitedCharacter(); if (result0 !== null) { - result0 = (function(char_) { + result0 = (function(offset, char_) { return { data: char_, // FIXME: Get the raw text from the input directly. rawText: quoteForRegexpClass(char_) }; - })(result0); + })(pos0, result0); } if (result0 === null) { pos = pos0; @@ -2583,7 +2583,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(char_) { return char_; })(result0[1]); + result0 = (function(offset, char_) { return char_; })(pos0, result0[1]); } if (result0 === null) { pos = pos0; @@ -2679,7 +2679,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(char_) { + result0 = (function(offset, char_) { return char_ .replace("b", "\b") .replace("f", "\f") @@ -2687,7 +2687,7 @@ PEG.parser = (function(){ .replace("r", "\r") .replace("t", "\t") .replace("v", "\x0B"); // IE does not recognize "\v". - })(result0[2]); + })(pos0, result0[2]); } if (result0 === null) { pos = pos0; @@ -2744,7 +2744,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function() { return "\x00"; })(); + result0 = (function(offset) { return "\x00"; })(pos0); } if (result0 === null) { pos = pos0; @@ -2798,9 +2798,9 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(h1, h2) { + result0 = (function(offset, h1, h2) { return String.fromCharCode(parseInt(h1 + h2, 16)); - })(result0[1], result0[2]); + })(pos0, result0[1], result0[2]); } if (result0 === null) { pos = pos0; @@ -2866,9 +2866,9 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(h1, h2, h3, h4) { + result0 = (function(offset, h1, h2, h3, h4) { return String.fromCharCode(parseInt(h1 + h2 + h3 + h4, 16)); - })(result0[1], result0[2], result0[3], result0[4]); + })(pos0, result0[1], result0[2], result0[3], result0[4]); } if (result0 === null) { pos = pos0; @@ -2916,7 +2916,7 @@ PEG.parser = (function(){ pos = pos1; } if (result0 !== null) { - result0 = (function(eol) { return eol; })(result0[1]); + result0 = (function(offset, eol) { return eol; })(pos0, result0[1]); } if (result0 === null) { pos = pos0; diff --git a/test/compiler-test.js b/test/compiler-test.js index 81dfe37..c9a674a 100644 --- a/test/compiler-test.js +++ b/test/compiler-test.js @@ -70,36 +70,50 @@ test("semantic and", function() { doesNotParse(rejectingParser, "ab"); var singleElementUnlabeledParser = PEG.buildParser( - 'start = "a" &{ return arguments.length === 0; }' + 'start = "a" &{ return arguments.length === 1 && offset === 1; }' ); parses(singleElementUnlabeledParser, "a", ["a", ""]); - var singleElementLabeledParser = PEG.buildParser( - 'start = a:"a" &{ return arguments.length === 1 && a === "a"; }' - ); + var singleElementLabeledParser = PEG.buildParser([ + 'start = a:"a" &{', + ' return arguments.length === 2', + ' && offset === 1', + ' && a === "a";', + ' }' + ].join("\n")); parses(singleElementLabeledParser, "a", ["a", ""]); var multiElementUnlabeledParser = PEG.buildParser( - 'start = "a" "b" "c" &{ return arguments.length === 0; }' + 'start = "a" "b" "c" &{ return arguments.length === 1 && offset === 3; }' ); parses(multiElementUnlabeledParser, "abc", ["a", "b", "c", ""]); var multiElementLabeledParser = PEG.buildParser([ - 'start = a:"a" "b" c:"c"', - ' &{ return arguments.length === 2 && a === "a" && c === "c"; }' + 'start = a:"a" "b" c:"c" &{', + ' return arguments.length === 3', + ' && offset === 3', + ' && a === "a"', + ' && c === "c";', + ' }' ].join("\n")); parses(multiElementLabeledParser, "abc", ["a", "b", "c", ""]); - var innerElementsUnlabeledParser = PEG.buildParser( - 'start = "a" ("b" "c" "d" &{ return arguments.length === 0; }) "e"' - ); + var innerElementsUnlabeledParser = PEG.buildParser([ + 'start = "a"', + ' ("b" "c" "d" &{ return arguments.length === 1 && offset === 4; })', + ' "e"' + ].join("\n")); parses(innerElementsUnlabeledParser, "abcde", ["a", ["b", "c", "d", ""], "e"]); var innerElementsLabeledParser = PEG.buildParser([ 'start = "a"', ' (', - ' b:"b" "c" d:"d"', - ' &{ return arguments.length === 2 && b === "b" && d === "d"; }', + ' b:"b" "c" d:"d" &{', + ' return arguments.length === 3', + ' && offset === 4', + ' && b === "b"', + ' && d === "d";', + ' }', ' )', ' "e"' ].join("\n")); @@ -114,36 +128,50 @@ test("semantic not", function() { doesNotParse(rejectingParser, "ab"); var singleElementUnlabeledParser = PEG.buildParser( - 'start = "a" !{ return arguments.length !== 0; }' + 'start = "a" !{ return arguments.length !== 1 || offset !== 1; }' ); parses(singleElementUnlabeledParser, "a", ["a", ""]); - var singleElementLabeledParser = PEG.buildParser( - 'start = a:"a" !{ return arguments.length !== 1 || a !== "a"; }' - ); + var singleElementLabeledParser = PEG.buildParser([ + 'start = a:"a" !{', + ' return arguments.length !== 2', + ' || offset !== 1', + ' || a !== "a";', + ' }' + ].join("\n")); parses(singleElementLabeledParser, "a", ["a", ""]); var multiElementUnlabeledParser = PEG.buildParser( - 'start = "a" "b" "c" !{ return arguments.length !== 0; }' + 'start = "a" "b" "c" !{ return arguments.length !== 1 || offset !== 3; }' ); parses(multiElementUnlabeledParser, "abc", ["a", "b", "c", ""]); var multiElementLabeledParser = PEG.buildParser([ - 'start = a:"a" "b" c:"c"', - ' !{ return arguments.length !== 2 || a !== "a" || c !== "c"; }' + 'start = a:"a" "b" c:"c" !{', + ' return arguments.length !== 3', + ' || offset !== 3', + ' || a !== "a"', + ' || c !== "c";', + ' }' ].join("\n")); parses(multiElementLabeledParser, "abc", ["a", "b", "c", ""]); - var innerElementsUnlabeledParser = PEG.buildParser( - 'start = "a" ("b" "c" "d" !{ return arguments.length !== 0; }) "e"' - ); + var innerElementsUnlabeledParser = PEG.buildParser([ + 'start = "a"', + ' ("b" "c" "d" !{ return arguments.length !== 1 || offset !== 4; })', + ' "e"' + ].join("\n")); parses(innerElementsUnlabeledParser, "abcde", ["a", ["b", "c", "d", ""], "e"]); var innerElementsLabeledParser = PEG.buildParser([ 'start = "a"', ' (', - ' b:"b" "c" d:"d"', - ' !{ return arguments.length !== 2 || b !== "b" || d !== "d"; }', + ' b:"b" "c" d:"d" !{', + ' return arguments.length !== 3', + ' || offset !== 4', + ' || b !== "b"', + ' || d !== "d";', + ' }', ' )', ' "e"' ].join("\n")); @@ -174,32 +202,34 @@ test("actions", function() { var singleElementUnlabeledParser = PEG.buildParser( 'start = "a" { return arguments.length; }' ); - parses(singleElementUnlabeledParser, "a", 0); + parses(singleElementUnlabeledParser, "a", 1); var singleElementLabeledParser = PEG.buildParser( - 'start = a:"a" { return [arguments.length, a]; }' + 'start = a:"a" { return [arguments.length, offset, a]; }' ); - parses(singleElementLabeledParser, "a", [1, "a"]); + parses(singleElementLabeledParser, "a", [2, 0, "a"]); var multiElementUnlabeledParser = PEG.buildParser( 'start = "a" "b" "c" { return arguments.length; }' ); - parses(multiElementUnlabeledParser, "abc", 0); + parses(multiElementUnlabeledParser, "abc", 1); var multiElementLabeledParser = PEG.buildParser( - 'start = a:"a" "b" c:"c" { return [arguments.length, a, c]; }' + 'start = a:"a" "b" c:"c" { return [arguments.length, offset, a, c]; }' ); - parses(multiElementLabeledParser, "abc", [2, "a", "c"]); + parses(multiElementLabeledParser, "abc", [3, 0, "a", "c"]); var innerElementsUnlabeledParser = PEG.buildParser( 'start = "a" ("b" "c" "d" { return arguments.length; }) "e"' ); - parses(innerElementsUnlabeledParser, "abcde", ["a", 0, "e"]); + parses(innerElementsUnlabeledParser, "abcde", ["a", 1, "e"]); - var innerElementsLabeledParser = PEG.buildParser( - 'start = "a" (b:"b" "c" d:"d" { return [arguments.length, b, d]; }) "e"' - ); - parses(innerElementsLabeledParser, "abcde", ["a", [2, "b", "d"], "e"]); + var innerElementsLabeledParser = PEG.buildParser([ + 'start = "a"', + ' (b:"b" "c" d:"d" { return [arguments.length, offset, b, d]; })', + ' "e"' + ].join("\n")); + parses(innerElementsLabeledParser, "abcde", ["a", [3, 1, "b", "d"], "e"]); /* * Test that the parsing position returns after successfull parsing of the