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/*!
* regjsgen 0.5.0
* Copyright 2014-2018 Benjamin Tan <https://bnjmnt4n.now.sh/>
* Available under MIT license <https://github.com/bnjmnt4n/regjsgen/blob/master/LICENSE>
*/
;(function() {
'use strict';
// Used to determine if values are of the language type `Object`.
var objectTypes = {
'function': true,
'object': true
};
// Used as a reference to the global object.
var root = (objectTypes[typeof window] && window) || this;
// Detect free variable `exports`.
var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;
// Detect free variable `module`.
var hasFreeModule = objectTypes[typeof module] && module && !module.nodeType;
// Detect free variable `global` from Node.js or Browserified code and use it as `root`.
var freeGlobal = freeExports && hasFreeModule && typeof global == 'object' && global;
if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) {
root = freeGlobal;
}
// Used to check objects for own properties.
var hasOwnProperty = Object.prototype.hasOwnProperty;
/*--------------------------------------------------------------------------*/
// Generates a string based on the given code point.
// Based on https://mths.be/fromcodepoint by @mathias.
function fromCodePoint() {
var codePoint = Number(arguments[0]);
if (
!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
codePoint < 0 || // not a valid Unicode code point
codePoint > 0x10FFFF || // not a valid Unicode code point
Math.floor(codePoint) != codePoint // not an integer
) {
throw RangeError('Invalid code point: ' + codePoint);
}
if (codePoint <= 0xFFFF) {
// BMP code point
return String.fromCharCode(codePoint);
} else {
// Astral code point; split in surrogate halves
// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
codePoint -= 0x10000;
var highSurrogate = (codePoint >> 10) + 0xD800;
var lowSurrogate = (codePoint % 0x400) + 0xDC00;
return String.fromCharCode(highSurrogate, lowSurrogate);
}
}
/*--------------------------------------------------------------------------*/
// Ensures that nodes have the correct types.
var assertTypeRegexMap = {};
function assertType(type, expected) {
if (expected.indexOf('|') == -1) {
if (type == expected) {
return;
}
throw Error('Invalid node type: ' + type + '; expected type: ' + expected);
}
expected = hasOwnProperty.call(assertTypeRegexMap, expected)
? assertTypeRegexMap[expected]
: (assertTypeRegexMap[expected] = RegExp('^(?:' + expected + ')$'));
if (expected.test(type)) {
return;
}
throw Error('Invalid node type: ' + type + '; expected types: ' + expected);
}
/*--------------------------------------------------------------------------*/
// Generates a regular expression string based on an AST.
function generate(node) {
var type = node.type;
if (hasOwnProperty.call(generators, type)) {
return generators[type](node);
}
throw Error('Invalid node type: ' + type);
}
/*--------------------------------------------------------------------------*/
function generateAlternative(node) {
assertType(node.type, 'alternative');
var terms = node.body,
i = -1,
length = terms.length,
result = '';
while (++i < length) {
result += generateTerm(terms[i]);
}
return result;
}
function generateAnchor(node) {
assertType(node.type, 'anchor');
switch (node.kind) {
case 'start':
return '^';
case 'end':
return '$';
case 'boundary':
return '\\b';
case 'not-boundary':
return '\\B';
default:
throw Error('Invalid assertion');
}
}
function generateAtom(node) {
assertType(node.type, 'anchor|characterClass|characterClassEscape|dot|group|reference|value');
return generate(node);
}
function generateCharacterClass(node) {
assertType(node.type, 'characterClass');
var classRanges = node.body,
i = -1,
length = classRanges.length,
result = '';
if (node.negative) {
result += '^';
}
while (++i < length) {
result += generateClassAtom(classRanges[i]);
}
return '[' + result + ']';
}
function generateCharacterClassEscape(node) {
assertType(node.type, 'characterClassEscape');
return '\\' + node.value;
}
function generateUnicodePropertyEscape(node) {
assertType(node.type, 'unicodePropertyEscape');
return '\\' + (node.negative ? 'P' : 'p') + '{' + node.value + '}';
}
function generateCharacterClassRange(node) {
assertType(node.type, 'characterClassRange');
var min = node.min,
max = node.max;
if (min.type == 'characterClassRange' || max.type == 'characterClassRange') {
throw Error('Invalid character class range');
}
return generateClassAtom(min) + '-' + generateClassAtom(max);
}
function generateClassAtom(node) {
assertType(node.type, 'anchor|characterClassEscape|characterClassRange|dot|value');
return generate(node);
}
function generateDisjunction(node) {
assertType(node.type, 'disjunction');
var body = node.body,
i = -1,
length = body.length,
result = '';
while (++i < length) {
if (i != 0) {
result += '|';
}
result += generate(body[i]);
}
return result;
}
function generateDot(node) {
assertType(node.type, 'dot');
return '.';
}
function generateGroup(node) {
assertType(node.type, 'group');
var result = '';
switch (node.behavior) {
case 'normal':
if (node.name) {
result += '?<' + generateIdentifier(node.name) + '>';
}
break;
case 'ignore':
result += '?:';
break;
case 'lookahead':
result += '?=';
break;
case 'negativeLookahead':
result += '?!';
break;
case 'lookbehind':
result += '?<=';
break;
case 'negativeLookbehind':
result += '?<!';
break;
default:
throw Error('Invalid behaviour: ' + node.behaviour);
}
var body = node.body,
i = -1,
length = body.length;
while (++i < length) {
result += generate(body[i]);
}
return '(' + result + ')';
}
function generateIdentifier(node) {
assertType(node.type, 'identifier');
return node.value;
}
function generateQuantifier(node) {
assertType(node.type, 'quantifier');
var quantifier = '',
min = node.min,
max = node.max;
if (max == null) {
if (min == 0) {
quantifier = '*';
} else if (min == 1) {
quantifier = '+';
} else {
quantifier = '{' + min + ',}';
}
} else if (min == max) {
quantifier = '{' + min + '}';
} else if (min == 0 && max == 1) {
quantifier = '?';
} else {
quantifier = '{' + min + ',' + max + '}';
}
if (!node.greedy) {
quantifier += '?';
}
return generateAtom(node.body[0]) + quantifier;
}
function generateReference(node) {
assertType(node.type, 'reference');
if (node.matchIndex) {
return '\\' + node.matchIndex;
}
if (node.name) {
return '\\k<' + generateIdentifier(node.name) + '>';
}
throw new Error('Unknown reference type');
}
function generateTerm(node) {
assertType(node.type, 'anchor|characterClass|characterClassEscape|empty|group|quantifier|reference|unicodePropertyEscape|value');
return generate(node);
}
function generateValue(node) {
assertType(node.type, 'value');
var kind = node.kind,
codePoint = node.codePoint;
if (typeof codePoint != 'number') {
throw new Error('Invalid code point: ' + codePoint);
}
switch (kind) {
case 'controlLetter':
return '\\c' + fromCodePoint(codePoint + 64);
case 'hexadecimalEscape':
return '\\x' + ('00' + codePoint.toString(16).toUpperCase()).slice(-2);
case 'identifier':
return '\\' + fromCodePoint(codePoint);
case 'null':
return '\\' + codePoint;
case 'octal':
return '\\' + codePoint.toString(8);
case 'singleEscape':
switch (codePoint) {
case 0x0008:
return '\\b';
case 0x0009:
return '\\t';
case 0x000A:
return '\\n';
case 0x000B:
return '\\v';
case 0x000C:
return '\\f';
case 0x000D:
return '\\r';
default:
throw Error('Invalid code point: ' + codePoint);
}
case 'symbol':
return fromCodePoint(codePoint);
case 'unicodeEscape':
return '\\u' + ('0000' + codePoint.toString(16).toUpperCase()).slice(-4);
case 'unicodeCodePointEscape':
return '\\u{' + codePoint.toString(16).toUpperCase() + '}';
default:
throw Error('Unsupported node kind: ' + kind);
}
}
/*--------------------------------------------------------------------------*/
// Used to generate strings for each node type.
var generators = {
'alternative': generateAlternative,
'anchor': generateAnchor,
'characterClass': generateCharacterClass,
'characterClassEscape': generateCharacterClassEscape,
'characterClassRange': generateCharacterClassRange,
'unicodePropertyEscape': generateUnicodePropertyEscape,
'disjunction': generateDisjunction,
'dot': generateDot,
'group': generateGroup,
'quantifier': generateQuantifier,
'reference': generateReference,
'value': generateValue
};
/*--------------------------------------------------------------------------*/
// Export regjsgen.
var regjsgen = {
'generate': generate
};
// Some AMD build optimizers, like r.js, check for condition patterns like the following:
if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
// Define as an anonymous module so it can be aliased through path mapping.
define(function() {
return regjsgen;
});
root.regjsgen = regjsgen;
}
// Check for `exports` after `define` in case a build optimizer adds an `exports` object.
else if (freeExports && hasFreeModule) {
// Export for CommonJS support.
freeExports.generate = generate;
}
else {
// Export to the global object.
root.regjsgen = regjsgen;
}
}.call(this));