reduce generated code size, a lot #8
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Comments
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Maybe have a look to https://github.com/mishoo/UglifyJS2, |
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@AdrieanKhisbe it's not so much code volume, as complexity. Needs optimization of the parser generated code. |
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PEG.js can generate a size-optimized parser but I haven't compared the performance. The regenerated parser from the grammar is 748 LOC. @rjrodger Why do you want to reduce the size of parser-generated code? Size-optimized parsermodule.exports = /*
* Generated by PEG.js 0.10.0.
*
* http://pegjs.org/
*/
(function() {
"use strict";
function peg$subclass(child, parent) {
function ctor() { this.constructor = child; }
ctor.prototype = parent.prototype;
child.prototype = new ctor();
}
function peg$SyntaxError(message, expected, found, location) {
this.message = message;
this.expected = expected;
this.found = found;
this.location = location;
this.name = "SyntaxError";
if (typeof Error.captureStackTrace === "function") {
Error.captureStackTrace(this, peg$SyntaxError);
}
}
peg$subclass(peg$SyntaxError, Error);
peg$SyntaxError.buildMessage = function(expected, found) {
var DESCRIBE_EXPECTATION_FNS = {
literal: function(expectation) {
return "\"" + literalEscape(expectation.text) + "\"";
},
"class": function(expectation) {
var escapedParts = "",
i;
for (i = 0; i < expectation.parts.length; i++) {
escapedParts += expectation.parts[i] instanceof Array
? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1])
: classEscape(expectation.parts[i]);
}
return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
},
any: function(expectation) {
return "any character";
},
end: function(expectation) {
return "end of input";
},
other: function(expectation) {
return expectation.description;
}
};
function hex(ch) {
return ch.charCodeAt(0).toString(16).toUpperCase();
}
function literalEscape(s) {
return s
.replace(/\\/g, '\\\\')
.replace(/"/g, '\\"')
.replace(/\0/g, '\\0')
.replace(/\t/g, '\\t')
.replace(/\n/g, '\\n')
.replace(/\r/g, '\\r')
.replace(/[\x00-\x0F]/g, function(ch) { return '\\x0' + hex(ch); })
.replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x' + hex(ch); });
}
function classEscape(s) {
return s
.replace(/\\/g, '\\\\')
.replace(/\]/g, '\\]')
.replace(/\^/g, '\\^')
.replace(/-/g, '\\-')
.replace(/\0/g, '\\0')
.replace(/\t/g, '\\t')
.replace(/\n/g, '\\n')
.replace(/\r/g, '\\r')
.replace(/[\x00-\x0F]/g, function(ch) { return '\\x0' + hex(ch); })
.replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x' + hex(ch); });
}
function describeExpectation(expectation) {
return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
}
function describeExpected(expected) {
var descriptions = new Array(expected.length),
i, j;
for (i = 0; i < expected.length; i++) {
descriptions[i] = describeExpectation(expected[i]);
}
descriptions.sort();
if (descriptions.length > 0) {
for (i = 1, j = 1; i < descriptions.length; i++) {
if (descriptions[i - 1] !== descriptions[i]) {
descriptions[j] = descriptions[i];
j++;
}
}
descriptions.length = j;
}
switch (descriptions.length) {
case 1:
return descriptions[0];
case 2:
return descriptions[0] + " or " + descriptions[1];
default:
return descriptions.slice(0, -1).join(", ")
+ ", or "
+ descriptions[descriptions.length - 1];
}
}
function describeFound(found) {
return found ? "\"" + literalEscape(found) + "\"" : "end of input";
}
return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
};
function peg$parse(input, options) {
options = options !== void 0 ? options : {};
var peg$FAILED = {},
peg$startRuleIndices = { start: 0 },
peg$startRuleIndex = 0,
peg$consts = [
function(object) { return object; },
function(array) { return array; },
"{",
peg$literalExpectation("{", false),
"}",
peg$literalExpectation("}", false),
function() { return {}; },
function(members) { return members; },
",",
peg$literalExpectation(",", false),
function(head, tail) {
var result = {};
if( head ) { result[head[0]] = fixNull(head[1]); }
for (var i = 0; i < tail.length; i++) {
result[tail[i][2][0]] = fixNull(tail[i][2][1]);
}
return result;
},
":",
peg$literalExpectation(":", false),
function(name, value) { return [name, value]; },
"[",
peg$literalExpectation("[", false),
"]",
peg$literalExpectation("]", false),
function() { return []; },
function(elements) { return elements; },
function(head, tail) {
var result = [];
if( typeof head !== 'undefined' && head !== null ) { result.push( fixNull(head) ) }
for (var i = 0; i < tail.length; i++) {
result.push(fixNull(tail[i][2]));
}
return result;
},
"true",
peg$literalExpectation("true", false),
function() { return true; },
"false",
peg$literalExpectation("false", false),
function() { return false; },
"null",
peg$literalExpectation("null", false),
function() { return null_; },
function(lit) { return lit.join('').trim() },
peg$otherExpectation("double-quote string"),
"\"",
peg$literalExpectation("\"", false),
function() { return ""; },
function(chars) { return chars; },
peg$otherExpectation("single-quote string"),
"'",
peg$literalExpectation("'", false),
function(chars) { return chars.join(""); },
/^[^"\\\0-\x1F\x7F]/,
peg$classExpectation(["\"", "\\", ["\0", "\x1F"], "\x7F"], true, false),
"\\\"",
peg$literalExpectation("\\\"", false),
function() { return '"'; },
"\\\\",
peg$literalExpectation("\\\\", false),
function() { return "\\"; },
"\\/",
peg$literalExpectation("\\/", false),
function() { return "/"; },
"\\b",
peg$literalExpectation("\\b", false),
function() { return "\b"; },
"\\f",
peg$literalExpectation("\\f", false),
function() { return "\f"; },
"\\n",
peg$literalExpectation("\\n", false),
function() { return "\n"; },
"\\r",
peg$literalExpectation("\\r", false),
function() { return "\r"; },
"\\t",
peg$literalExpectation("\\t", false),
function() { return "\t"; },
"\\u",
peg$literalExpectation("\\u", false),
function(h1, h2, h3, h4) {
return String.fromCharCode(parseInt("0x" + h1 + h2 + h3 + h4)); },
/^[^'\\\0-\x1F\x7F]/,
peg$classExpectation(["'", "\\", ["\0", "\x1F"], "\x7F"], true, false),
"\\'",
peg$literalExpectation("\\'", false),
function() { return '\''; },
peg$otherExpectation("key"),
/^[a-zA-Z0-9_$\-]/,
peg$classExpectation([["a", "z"], ["A", "Z"], ["0", "9"], "_", "$", "-"], false, false),
function(chars) { return chars.join('') },
/^[^,}\]]/,
peg$classExpectation([",", "}", "]"], true, false),
peg$otherExpectation("number"),
function(int_, frac, exp, suffix) { return 0 === suffix.length ? parseFloat(int_ + frac + exp) : (int_ + frac + exp + suffix.join('')).trim(); },
function(int_, frac, suffix) { return 0 === suffix.length ? parseFloat(int_ + frac) : (int_ + frac + suffix.join('')).trim(); },
function(int_, exp, suffix) { return 0 === suffix.length ? parseFloat(int_ + exp) : (int_ + exp + suffix.join('')).trim(); },
function(int_, suffix) { return 0 === suffix.length ? parseFloat(int_) : (int_ + suffix.join('')).trim(); },
function(digit19, digits) { return digit19 + digits; },
"-",
peg$literalExpectation("-", false),
function(digit19, digits) { return "-" + digit19 + digits; },
function(digit) { return "-" + digit; },
".",
peg$literalExpectation(".", false),
function(digits) { return "." + digits; },
function(e, digits) { return e + digits; },
function(digits) { return digits.join(""); },
/^[eE]/,
peg$classExpectation(["e", "E"], false, false),
/^[+\-]/,
peg$classExpectation(["+", "-"], false, false),
function(e, sign) { return e + (sign?sign:''); },
/^[0-9]/,
peg$classExpectation([["0", "9"]], false, false),
/^[1-9]/,
peg$classExpectation([["1", "9"]], false, false),
/^[0-9a-fA-F]/,
peg$classExpectation([["0", "9"], ["a", "f"], ["A", "F"]], false, false),
peg$otherExpectation("whitespace"),
/^[ \t\n\r]/,
peg$classExpectation([" ", "\t", "\n", "\r"], false, false)
],
peg$bytecode = [
peg$decode("%;9/1#;!/($8\": \"! )(\"'#&'#.; &%;9/1#;$/($8\":!\"! )(\"'#&'#"),
peg$decode("%2\"\"\"6\"7#/H#;9/?$2$\"\"6$7%/0$;9/'$8$:&$ )($'#(#'#(\"'#&'#.b &%2\"\"\"6\"7#/R#;9/I$;\"/@$2$\"\"6$7%/1$;9/($8%:'%!\")(%'#($'#(#'#(\"'#&'#"),
peg$decode("%2(\"\"6(7).\" &\"/\xA8#;#.\" &\"/\x9A$$%2(\"\"6(7)/5#;9/,$;#/#$+#)(#'#(\"'#&'#0E*%2(\"\"6(7)/5#;9/,$;#/#$+#)(#'#(\"'#&'#&/F$2(\"\"6(7).\" &\"/2$;9/)$8%:*%\"#\")(%'#($'#(#'#(\"'#&'#"),
peg$decode("%;-/S#;9/J$2+\"\"6+7,/;$;9/2$;&/)$8%:-%\"$ )(%'#($'#(#'#(\"'#&'#"),
peg$decode("%2.\"\"6.7//H#;9/?$20\"\"6071/0$;9/'$8$:2$ )($'#(#'#(\"'#&'#.b &%2.\"\"6.7//R#;9/I$;%/@$20\"\"6071/1$;9/($8%:3%!\")(%'#($'#(#'#(\"'#&'#"),
peg$decode("%2(\"\"6(7).\" &\"/\xA8#;&.\" &\"/\x9A$$%2(\"\"6(7)/5#;9/,$;&/#$+#)(#'#(\"'#&'#0E*%2(\"\"6(7)/5#;9/,$;&/#$+#)(#'#(\"'#&'#&/F$2(\"\"6(7).\" &\"/2$;9/)$8%:4%\"#\")(%'#($'#(#'#(\"'#&'#"),
peg$decode(";'.\xB0 &;(.\xAA &;!.\xA4 &;$.\x9E &%25\"\"6576/0#;9/'$8\":7\" )(\"'#&'#.{ &%28\"\"6879/0#;9/'$8\"::\" )(\"'#&'#.X &%2;\"\"6;7</0#;9/'$8\":=\" )(\"'#&'#.5 &;0./ &%;./' 8!:>!! )"),
peg$decode("<%2@\"\"6@7A/?#2@\"\"6@7A/0$;9/'$8#:B# )(#'#(\"'#&'#.Y &%2@\"\"6@7A/I#;)/@$2@\"\"6@7A/1$;9/($8$:C$!\")($'#(#'#(\"'#&'#=.\" 7?"),
peg$decode("<%2E\"\"6E7F/?#2E\"\"6E7F/0$;9/'$8#:B# )(#'#(\"'#&'#.Y &%2E\"\"6E7F/I#;+/@$2E\"\"6E7F/1$;9/($8$:C$!\")($'#(#'#(\"'#&'#=.\" 7D"),
peg$decode("%$;*/�#*;*&&&#/' 8!:G!! )"),
peg$decode("4H\"\"5!7I.\u0117 &%2J\"\"6J7K/& 8!:L! ).\u0100 &%2M\"\"6M7N/& 8!:O! ).\xE9 &%2P\"\"6P7Q/& 8!:R! ).\xD2 &%2S\"\"6S7T/& 8!:U! ).\xBB &%2V\"\"6V7W/& 8!:X! ).\xA4 &%2Y\"\"6Y7Z/& 8!:[! ).\x8D &%2\\\"\"6\\7]/& 8!:^! ).v &%2_\"\"6_7`/& 8!:a! )._ &%2b\"\"6b7c/O#;8/F$;8/=$;8/4$;8/+$8%:d%$#\"! )(%'#($'#(#'#(\"'#&'#"),
peg$decode("%$;,/�#*;,&&&#/' 8!:G!! )"),
peg$decode("4e\"\"5!7f.\u0117 &%2g\"\"6g7h/& 8!:i! ).\u0100 &%2M\"\"6M7N/& 8!:O! ).\xE9 &%2P\"\"6P7Q/& 8!:R! ).\xD2 &%2S\"\"6S7T/& 8!:U! ).\xBB &%2V\"\"6V7W/& 8!:X! ).\xA4 &%2Y\"\"6Y7Z/& 8!:[! ).\x8D &%2\\\"\"6\\7]/& 8!:^! ).v &%2_\"\"6_7`/& 8!:a! )._ &%2b\"\"6b7c/O#;8/F$;8/=$;8/4$;8/+$8%:d%$#\"! )(%'#($'#(#'#(\"'#&'#"),
peg$decode("<;'.N &;(.H &%$4k\"\"5!7l/,#0)*4k\"\"5!7l&&&#/' 8!:m!! )=.\" 7j"),
peg$decode("$;//�#*;/&&&#"),
peg$decode("4n\"\"5!7o"),
peg$decode("<%;1/V#;2/M$;3/D$;9/;$$;/0#*;/&/+$8%:q%$$#\" )(%'#($'#(#'#(\"'#&'#.\xBE &%;1/L#;2/C$;9/:$$;/0#*;/&/*$8$:r$##\" )($'#(#'#(\"'#&'#.\x85 &%;1/L#;3/C$;9/:$$;/0#*;/&/*$8$:s$##\" )($'#(#'#(\"'#&'#.L &%;1/B#;9/9$$;/0#*;/&/)$8#:t#\"\" )(#'#(\"'#&'#=.\" 7p"),
peg$decode("%;7/2#;4/)$8\":u\"\"! )(\"'#&'#.u &;6.o &%2v\"\"6v7w/;#;7/2$;4/)$8#:x#\"! )(#'#(\"'#&'#.A &%2v\"\"6v7w/1#;6/($8\":y\"! )(\"'#&'#"),
peg$decode("%2z\"\"6z7{/1#;4/($8\":|\"! )(\"'#&'#"),
peg$decode("%;5/2#;4/)$8\":}\"\"! )(\"'#&'#"),
peg$decode("%$;6/�#*;6&&&#/' 8!:~!! )"),
peg$decode("%4\x7F\"\"5!7\x80/=#4\x81\"\"5!7\x82.\" &\"/)$8\":\x83\"\"! )(\"'#&'#"),
peg$decode("4\x84\"\"5!7\x85"),
peg$decode("4\x86\"\"5!7\x87"),
peg$decode("4\x88\"\"5!7\x89"),
peg$decode("<$;:0#*;:&=.\" 7\x8A"),
peg$decode("4\x8B\"\"5!7\x8C")
],
peg$currPos = 0,
peg$savedPos = 0,
peg$posDetailsCache = [{ line: 1, column: 1 }],
peg$maxFailPos = 0,
peg$maxFailExpected = [],
peg$silentFails = 0,
peg$result;
if ("startRule" in options) {
if (!(options.startRule in peg$startRuleIndices)) {
throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
}
peg$startRuleIndex = peg$startRuleIndices[options.startRule];
}
function text() {
return input.substring(peg$savedPos, peg$currPos);
}
function location() {
return peg$computeLocation(peg$savedPos, peg$currPos);
}
function expected(description, location) {
location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
throw peg$buildStructuredError(
[peg$otherExpectation(description)],
input.substring(peg$savedPos, peg$currPos),
location
);
}
function error(message, location) {
location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)
throw peg$buildSimpleError(message, location);
}
function peg$literalExpectation(text, ignoreCase) {
return { type: "literal", text: text, ignoreCase: ignoreCase };
}
function peg$classExpectation(parts, inverted, ignoreCase) {
return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
}
function peg$anyExpectation() {
return { type: "any" };
}
function peg$endExpectation() {
return { type: "end" };
}
function peg$otherExpectation(description) {
return { type: "other", description: description };
}
function peg$computePosDetails(pos) {
var details = peg$posDetailsCache[pos], p;
if (details) {
return details;
} else {
p = pos - 1;
while (!peg$posDetailsCache[p]) {
p--;
}
details = peg$posDetailsCache[p];
details = {
line: details.line,
column: details.column
};
while (p < pos) {
if (input.charCodeAt(p) === 10) {
details.line++;
details.column = 1;
} else {
details.column++;
}
p++;
}
peg$posDetailsCache[pos] = details;
return details;
}
}
function peg$computeLocation(startPos, endPos) {
var startPosDetails = peg$computePosDetails(startPos),
endPosDetails = peg$computePosDetails(endPos);
return {
start: {
offset: startPos,
line: startPosDetails.line,
column: startPosDetails.column
},
end: {
offset: endPos,
line: endPosDetails.line,
column: endPosDetails.column
}
};
}
function peg$fail(expected) {
if (peg$currPos < peg$maxFailPos) { return; }
if (peg$currPos > peg$maxFailPos) {
peg$maxFailPos = peg$currPos;
peg$maxFailExpected = [];
}
peg$maxFailExpected.push(expected);
}
function peg$buildSimpleError(message, location) {
return new peg$SyntaxError(message, null, null, location);
}
function peg$buildStructuredError(expected, found, location) {
return new peg$SyntaxError(
peg$SyntaxError.buildMessage(expected, found),
expected,
found,
location
);
}
function peg$decode(s) {
var bc = new Array(s.length), i;
for (i = 0; i < s.length; i++) {
bc[i] = s.charCodeAt(i) - 32;
}
return bc;
}
function peg$parseRule(index) {
var bc = peg$bytecode[index],
ip = 0,
ips = [],
end = bc.length,
ends = [],
stack = [],
params, i;
while (true) {
while (ip < end) {
switch (bc[ip]) {
case 0:
stack.push(peg$consts[bc[ip + 1]]);
ip += 2;
break;
case 1:
stack.push(void 0);
ip++;
break;
case 2:
stack.push(null);
ip++;
break;
case 3:
stack.push(peg$FAILED);
ip++;
break;
case 4:
stack.push([]);
ip++;
break;
case 5:
stack.push(peg$currPos);
ip++;
break;
case 6:
stack.pop();
ip++;
break;
case 7:
peg$currPos = stack.pop();
ip++;
break;
case 8:
stack.length -= bc[ip + 1];
ip += 2;
break;
case 9:
stack.splice(-2, 1);
ip++;
break;
case 10:
stack[stack.length - 2].push(stack.pop());
ip++;
break;
case 11:
stack.push(stack.splice(stack.length - bc[ip + 1], bc[ip + 1]));
ip += 2;
break;
case 12:
stack.push(input.substring(stack.pop(), peg$currPos));
ip++;
break;
case 13:
ends.push(end);
ips.push(ip + 3 + bc[ip + 1] + bc[ip + 2]);
if (stack[stack.length - 1]) {
end = ip + 3 + bc[ip + 1];
ip += 3;
} else {
end = ip + 3 + bc[ip + 1] + bc[ip + 2];
ip += 3 + bc[ip + 1];
}
break;
case 14:
ends.push(end);
ips.push(ip + 3 + bc[ip + 1] + bc[ip + 2]);
if (stack[stack.length - 1] === peg$FAILED) {
end = ip + 3 + bc[ip + 1];
ip += 3;
} else {
end = ip + 3 + bc[ip + 1] + bc[ip + 2];
ip += 3 + bc[ip + 1];
}
break;
case 15:
ends.push(end);
ips.push(ip + 3 + bc[ip + 1] + bc[ip + 2]);
if (stack[stack.length - 1] !== peg$FAILED) {
end = ip + 3 + bc[ip + 1];
ip += 3;
} else {
end = ip + 3 + bc[ip + 1] + bc[ip + 2];
ip += 3 + bc[ip + 1];
}
break;
case 16:
if (stack[stack.length - 1] !== peg$FAILED) {
ends.push(end);
ips.push(ip);
end = ip + 2 + bc[ip + 1];
ip += 2;
} else {
ip += 2 + bc[ip + 1];
}
break;
case 17:
ends.push(end);
ips.push(ip + 3 + bc[ip + 1] + bc[ip + 2]);
if (input.length > peg$currPos) {
end = ip + 3 + bc[ip + 1];
ip += 3;
} else {
end = ip + 3 + bc[ip + 1] + bc[ip + 2];
ip += 3 + bc[ip + 1];
}
break;
case 18:
ends.push(end);
ips.push(ip + 4 + bc[ip + 2] + bc[ip + 3]);
if (input.substr(peg$currPos, peg$consts[bc[ip + 1]].length) === peg$consts[bc[ip + 1]]) {
end = ip + 4 + bc[ip + 2];
ip += 4;
} else {
end = ip + 4 + bc[ip + 2] + bc[ip + 3];
ip += 4 + bc[ip + 2];
}
break;
case 19:
ends.push(end);
ips.push(ip + 4 + bc[ip + 2] + bc[ip + 3]);
if (input.substr(peg$currPos, peg$consts[bc[ip + 1]].length).toLowerCase() === peg$consts[bc[ip + 1]]) {
end = ip + 4 + bc[ip + 2];
ip += 4;
} else {
end = ip + 4 + bc[ip + 2] + bc[ip + 3];
ip += 4 + bc[ip + 2];
}
break;
case 20:
ends.push(end);
ips.push(ip + 4 + bc[ip + 2] + bc[ip + 3]);
if (peg$consts[bc[ip + 1]].test(input.charAt(peg$currPos))) {
end = ip + 4 + bc[ip + 2];
ip += 4;
} else {
end = ip + 4 + bc[ip + 2] + bc[ip + 3];
ip += 4 + bc[ip + 2];
}
break;
case 21:
stack.push(input.substr(peg$currPos, bc[ip + 1]));
peg$currPos += bc[ip + 1];
ip += 2;
break;
case 22:
stack.push(peg$consts[bc[ip + 1]]);
peg$currPos += peg$consts[bc[ip + 1]].length;
ip += 2;
break;
case 23:
stack.push(peg$FAILED);
if (peg$silentFails === 0) {
peg$fail(peg$consts[bc[ip + 1]]);
}
ip += 2;
break;
case 24:
peg$savedPos = stack[stack.length - 1 - bc[ip + 1]];
ip += 2;
break;
case 25:
peg$savedPos = peg$currPos;
ip++;
break;
case 26:
params = bc.slice(ip + 4, ip + 4 + bc[ip + 3]);
for (i = 0; i < bc[ip + 3]; i++) {
params[i] = stack[stack.length - 1 - params[i]];
}
stack.splice(
stack.length - bc[ip + 2],
bc[ip + 2],
peg$consts[bc[ip + 1]].apply(null, params)
);
ip += 4 + bc[ip + 3];
break;
case 27:
stack.push(peg$parseRule(bc[ip + 1]));
ip += 2;
break;
case 28:
peg$silentFails++;
ip++;
break;
case 29:
peg$silentFails--;
ip++;
break;
default:
throw new Error("Invalid opcode: " + bc[ip] + ".");
}
}
if (ends.length > 0) {
end = ends.pop();
ip = ips.pop();
} else {
break;
}
}
return stack[0];
}
/*
* We can't return |null| in the |value| rule because that would mean parse
* failure. So we return a special object instead and convert it to |null|
* later.
*/
var null_ = new Object;
function fixNull(value) {
return value === null_ ? null : value;
}
peg$result = peg$parseRule(peg$startRuleIndex);
if (peg$result !== peg$FAILED && peg$currPos === input.length) {
return peg$result;
} else {
if (peg$result !== peg$FAILED && peg$currPos < input.length) {
peg$fail(peg$endExpectation());
}
throw peg$buildStructuredError(
peg$maxFailExpected,
peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
peg$maxFailPos < input.length
? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
: peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
);
}
}
return {
SyntaxError: peg$SyntaxError,
parse: peg$parse
};
})(); |
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open problem... any ideas?
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