410 lines
11 KiB
JavaScript
410 lines
11 KiB
JavaScript
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/*!
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* regjsgen 0.5.2
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* Copyright 2014-2020 Benjamin Tan <https://ofcr.se/>
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* Available under the MIT license <https://github.com/bnjmnt4n/regjsgen/blob/master/LICENSE-MIT.txt>
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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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// Detect free variable `exports`.
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var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports;
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// Detect free variable `module`.
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var hasFreeModule = objectTypes[typeof module] && module && !module.nodeType;
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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 && hasFreeModule && 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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// Used to check objects for own properties.
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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/*--------------------------------------------------------------------------*/
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// Generates a string based on the given code point.
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// Based on https://mths.be/fromcodepoint by @mathias.
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function fromCodePoint() {
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var codePoint = Number(arguments[0]);
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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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Math.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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return String.fromCharCode(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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var highSurrogate = (codePoint >> 10) + 0xD800;
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var lowSurrogate = (codePoint % 0x400) + 0xDC00;
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return String.fromCharCode(highSurrogate, lowSurrogate);
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}
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}
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/*--------------------------------------------------------------------------*/
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// Ensures that nodes have the correct types.
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var assertTypeRegexMap = {};
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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 + '; expected type: ' + expected);
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}
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expected = hasOwnProperty.call(assertTypeRegexMap, expected)
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? assertTypeRegexMap[expected]
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: (assertTypeRegexMap[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 + '; expected types: ' + expected);
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}
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/*--------------------------------------------------------------------------*/
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// Generates a regular expression string based on an AST.
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function generate(node) {
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var type = node.type;
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if (hasOwnProperty.call(generators, type)) {
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return generators[type](node);
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}
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throw Error('Invalid node type: ' + type);
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}
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// Constructs a string by concatentating the output of each term.
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function generateSequence(generator, terms) {
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var i = -1,
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length = terms.length,
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result = '',
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term;
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while (++i < length) {
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term = terms[i];
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// Ensure that `\0` null escapes followed by number symbols are not
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// treated as backreferences.
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if (
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i + 1 < length &&
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terms[i].type == 'value' &&
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terms[i].kind == 'null' &&
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terms[i + 1].type == 'value' &&
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terms[i + 1].kind == 'symbol' &&
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terms[i + 1].codePoint >= 48 &&
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terms[i + 1].codePoint <= 57
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) {
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result += '\\000';
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continue;
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}
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result += generator(term);
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}
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return result;
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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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return generateSequence(generateTerm, node.body);
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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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return '[' +
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(node.negative ? '^' : '') +
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generateSequence(generateClassAtom, node.body) +
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']';
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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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i = -1,
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length = body.length,
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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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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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if (node.name) {
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result += '?<' + generateIdentifier(node.name) + '>';
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}
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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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case 'lookbehind':
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result += '?<=';
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break;
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case 'negativeLookbehind':
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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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result += generateSequence(generate, node.body);
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return '(' + result + ')';
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}
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function generateIdentifier(node) {
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assertType(node.type, 'identifier');
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return node.value;
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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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if (max == null) {
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if (min == 0) {
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quantifier = '*';
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} else if (min == 1) {
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quantifier = '+';
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} else {
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quantifier = '{' + min + ',}';
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}
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} else if (min == max) {
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quantifier = '{' + min + '}';
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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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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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if (node.matchIndex) {
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return '\\' + node.matchIndex;
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}
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if (node.name) {
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return '\\k<' + generateIdentifier(node.name) + '>';
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}
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throw new Error('Unknown reference type');
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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|unicodePropertyEscape|value|dot');
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return generate(node);
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}
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function generateUnicodePropertyEscape(node) {
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assertType(node.type, 'unicodePropertyEscape');
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return '\\' + (node.negative ? 'P' : 'p') + '{' + node.value + '}';
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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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if (typeof codePoint != 'number') {
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throw new Error('Invalid code point: ' + codePoint);
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}
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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 '\\' + ('000' + codePoint.toString(8)).slice(-3);
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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 0x0009:
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return '\\t';
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case 0x000A:
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return '\\n';
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case 0x000B:
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return '\\v';
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case 0x000C:
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return '\\f';
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case 0x000D:
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return '\\r';
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case 0x002D:
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return '\\-';
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default:
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throw Error('Invalid code point: ' + 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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// Used to generate strings for each node type.
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var generators = {
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'alternative': generateAlternative,
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'anchor': generateAnchor,
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'characterClass': generateCharacterClass,
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'characterClassEscape': generateCharacterClassEscape,
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'characterClassRange': generateCharacterClassRange,
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'disjunction': generateDisjunction,
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'dot': generateDot,
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'group': generateGroup,
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'quantifier': generateQuantifier,
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'reference': generateReference,
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'unicodePropertyEscape': generateUnicodePropertyEscape,
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'value': generateValue
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};
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/*--------------------------------------------------------------------------*/
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// Export regjsgen.
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var regjsgen = {
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'generate': generate
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};
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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 it can be aliased through path mapping.
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define(function() {
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return regjsgen;
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});
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root.regjsgen = regjsgen;
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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 && hasFreeModule) {
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// Export for CommonJS support.
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freeExports.generate = generate;
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}
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else {
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// Export to the global object.
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root.regjsgen = regjsgen;
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}
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}.call(this));
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