409 lines
10 KiB
JavaScript
409 lines
10 KiB
JavaScript
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/*!
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* RegJSGen
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* Copyright 2014 Benjamin Tan <https://d10.github.io/>
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* Available under MIT license <http://d10.mit-license.org/>
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*/
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;(function() {
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'use strict';
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/** Used to determine if values are of the language type `Object` */
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var objectTypes = {
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'function': true,
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'object': true
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};
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/** Used as a reference to the global object */
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var root = (objectTypes[typeof window] && window) || this;
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/** Backup possible global object */
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var oldRoot = root;
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/** Detect free variable `exports` */
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var freeExports = objectTypes[typeof exports] && exports;
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/** Detect free variable `module` */
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var freeModule = objectTypes[typeof module] && module && !module.nodeType && module;
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/** Detect free variable `global` from Node.js or Browserified code and use it as `root` */
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var freeGlobal = freeExports && freeModule && typeof global == 'object' && global;
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if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) {
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root = freeGlobal;
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}
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/*--------------------------------------------------------------------------*/
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/*! Based on https://mths.be/fromcodepoint v0.2.0 by @mathias */
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var stringFromCharCode = String.fromCharCode;
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var floor = Math.floor;
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function fromCodePoint() {
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var MAX_SIZE = 0x4000;
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var codeUnits = [];
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var highSurrogate;
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var lowSurrogate;
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var index = -1;
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var length = arguments.length;
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if (!length) {
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return '';
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}
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var result = '';
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while (++index < length) {
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var codePoint = Number(arguments[index]);
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if (
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!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
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codePoint < 0 || // not a valid Unicode code point
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codePoint > 0x10FFFF || // not a valid Unicode code point
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floor(codePoint) != codePoint // not an integer
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) {
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throw RangeError('Invalid code point: ' + codePoint);
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}
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if (codePoint <= 0xFFFF) {
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// BMP code point
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codeUnits.push(codePoint);
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} else {
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// Astral code point; split in surrogate halves
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// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
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codePoint -= 0x10000;
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highSurrogate = (codePoint >> 10) + 0xD800;
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lowSurrogate = (codePoint % 0x400) + 0xDC00;
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codeUnits.push(highSurrogate, lowSurrogate);
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}
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if (index + 1 == length || codeUnits.length > MAX_SIZE) {
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result += stringFromCharCode.apply(null, codeUnits);
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codeUnits.length = 0;
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}
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}
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return result;
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}
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function assertType(type, expected) {
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if (expected.indexOf('|') == -1) {
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if (type == expected) {
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return;
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}
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throw Error('Invalid node type: ' + type);
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}
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expected = assertType.hasOwnProperty(expected)
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? assertType[expected]
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: (assertType[expected] = RegExp('^(?:' + expected + ')$'));
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if (expected.test(type)) {
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return;
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}
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throw Error('Invalid node type: ' + type);
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}
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/*--------------------------------------------------------------------------*/
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function generate(node) {
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var type = node.type;
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if (generate.hasOwnProperty(type) && typeof generate[type] == 'function') {
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return generate[type](node);
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}
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throw Error('Invalid node type: ' + type);
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}
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/*--------------------------------------------------------------------------*/
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function generateAlternative(node) {
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assertType(node.type, 'alternative');
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var terms = node.body,
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length = terms ? terms.length : 0;
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if (length == 1) {
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return generateTerm(terms[0]);
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} else {
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var i = -1,
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result = '';
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while (++i < length) {
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result += generateTerm(terms[i]);
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}
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return result;
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}
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}
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function generateAnchor(node) {
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assertType(node.type, 'anchor');
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switch (node.kind) {
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case 'start':
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return '^';
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case 'end':
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return '$';
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case 'boundary':
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return '\\b';
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case 'not-boundary':
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return '\\B';
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default:
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throw Error('Invalid assertion');
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}
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}
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function generateAtom(node) {
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assertType(node.type, 'anchor|characterClass|characterClassEscape|dot|group|reference|value');
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return generate(node);
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}
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function generateCharacterClass(node) {
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assertType(node.type, 'characterClass');
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var classRanges = node.body,
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length = classRanges ? classRanges.length : 0;
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var i = -1,
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result = '[';
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if (node.negative) {
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result += '^';
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}
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while (++i < length) {
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result += generateClassAtom(classRanges[i]);
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}
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result += ']';
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return result;
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}
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function generateCharacterClassEscape(node) {
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assertType(node.type, 'characterClassEscape');
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return '\\' + node.value;
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}
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function generateCharacterClassRange(node) {
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assertType(node.type, 'characterClassRange');
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var min = node.min,
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max = node.max;
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if (min.type == 'characterClassRange' || max.type == 'characterClassRange') {
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throw Error('Invalid character class range');
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}
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return generateClassAtom(min) + '-' + generateClassAtom(max);
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}
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function generateClassAtom(node) {
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assertType(node.type, 'anchor|characterClassEscape|characterClassRange|dot|value');
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return generate(node);
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}
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function generateDisjunction(node) {
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assertType(node.type, 'disjunction');
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var body = node.body,
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length = body ? body.length : 0;
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if (length == 0) {
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throw Error('No body');
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} else if (length == 1) {
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return generate(body[0]);
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} else {
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var i = -1,
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result = '';
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while (++i < length) {
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if (i != 0) {
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result += '|';
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}
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result += generate(body[i]);
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}
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return result;
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}
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}
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function generateDot(node) {
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assertType(node.type, 'dot');
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return '.';
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}
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function generateGroup(node) {
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assertType(node.type, 'group');
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var result = '(';
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switch (node.behavior) {
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case 'normal':
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break;
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case 'ignore':
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result += '?:';
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break;
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case 'lookahead':
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result += '?=';
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break;
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case 'negativeLookahead':
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result += '?!';
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break;
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default:
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throw Error('Invalid behaviour: ' + node.behaviour);
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}
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var body = node.body,
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length = body ? body.length : 0;
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if (length == 1) {
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result += generate(body[0]);
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} else {
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var i = -1;
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while (++i < length) {
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result += generate(body[i]);
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}
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}
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result += ')';
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return result;
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}
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function generateQuantifier(node) {
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assertType(node.type, 'quantifier');
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var quantifier = '',
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min = node.min,
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max = node.max;
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switch (max) {
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case undefined:
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case null:
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switch (min) {
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case 0:
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quantifier = '*'
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break;
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case 1:
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quantifier = '+';
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break;
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default:
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quantifier = '{' + min + ',}';
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break;
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}
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break;
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default:
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if (min == max) {
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quantifier = '{' + min + '}';
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}
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else if (min == 0 && max == 1) {
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quantifier = '?';
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} else {
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quantifier = '{' + min + ',' + max + '}';
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}
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break;
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}
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if (!node.greedy) {
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quantifier += '?';
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}
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return generateAtom(node.body[0]) + quantifier;
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}
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function generateReference(node) {
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assertType(node.type, 'reference');
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return '\\' + node.matchIndex;
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}
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function generateTerm(node) {
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assertType(node.type, 'anchor|characterClass|characterClassEscape|empty|group|quantifier|reference|value');
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return generate(node);
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}
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function generateValue(node) {
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assertType(node.type, 'value');
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var kind = node.kind,
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codePoint = node.codePoint;
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switch (kind) {
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case 'controlLetter':
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return '\\c' + fromCodePoint(codePoint + 64);
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case 'hexadecimalEscape':
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return '\\x' + ('00' + codePoint.toString(16).toUpperCase()).slice(-2);
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case 'identifier':
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return '\\' + fromCodePoint(codePoint);
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case 'null':
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return '\\' + codePoint;
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case 'octal':
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return '\\' + codePoint.toString(8);
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case 'singleEscape':
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switch (codePoint) {
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case 0x0008:
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return '\\b';
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case 0x009:
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return '\\t';
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case 0x00A:
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return '\\n';
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case 0x00B:
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return '\\v';
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case 0x00C:
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return '\\f';
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case 0x00D:
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return '\\r';
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default:
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throw Error('Invalid codepoint: ' + codePoint);
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}
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case 'symbol':
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return fromCodePoint(codePoint);
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case 'unicodeEscape':
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return '\\u' + ('0000' + codePoint.toString(16).toUpperCase()).slice(-4);
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case 'unicodeCodePointEscape':
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return '\\u{' + codePoint.toString(16).toUpperCase() + '}';
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default:
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throw Error('Unsupported node kind: ' + kind);
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}
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}
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/*--------------------------------------------------------------------------*/
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generate.alternative = generateAlternative;
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generate.anchor = generateAnchor;
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generate.characterClass = generateCharacterClass;
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generate.characterClassEscape = generateCharacterClassEscape;
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generate.characterClassRange = generateCharacterClassRange;
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generate.disjunction = generateDisjunction;
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generate.dot = generateDot;
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generate.group = generateGroup;
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generate.quantifier = generateQuantifier;
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generate.reference = generateReference;
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generate.value = generateValue;
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/*--------------------------------------------------------------------------*/
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// export regjsgen
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// some AMD build optimizers, like r.js, check for condition patterns like the following:
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if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
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// define as an anonymous module so, through path mapping, it can be aliased
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define(function() {
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return {
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'generate': generate
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};
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});
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}
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// check for `exports` after `define` in case a build optimizer adds an `exports` object
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else if (freeExports && freeModule) {
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// in Narwhal, Node.js, Rhino -require, or RingoJS
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freeExports.generate = generate;
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}
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// in a browser or Rhino
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||
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else {
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root.regjsgen = {
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'generate': generate
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};
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}
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}.call(this));
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