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85 lines
3.1 KiB
85 lines
3.1 KiB
4 years ago
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var DESCRIPTORS = require('../internals/descriptors');
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var global = require('../internals/global');
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var isForced = require('../internals/is-forced');
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var inheritIfRequired = require('../internals/inherit-if-required');
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var defineProperty = require('../internals/object-define-property').f;
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var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
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var isRegExp = require('../internals/is-regexp');
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var getFlags = require('../internals/regexp-flags');
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var stickyHelpers = require('../internals/regexp-sticky-helpers');
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var redefine = require('../internals/redefine');
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var fails = require('../internals/fails');
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var setInternalState = require('../internals/internal-state').set;
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var setSpecies = require('../internals/set-species');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var MATCH = wellKnownSymbol('match');
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var NativeRegExp = global.RegExp;
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var RegExpPrototype = NativeRegExp.prototype;
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var re1 = /a/g;
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var re2 = /a/g;
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// "new" should create a new object, old webkit bug
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var CORRECT_NEW = new NativeRegExp(re1) !== re1;
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var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
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var FORCED = DESCRIPTORS && isForced('RegExp', (!CORRECT_NEW || UNSUPPORTED_Y || fails(function () {
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re2[MATCH] = false;
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// RegExp constructor can alter flags and IsRegExp works correct with @@match
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return NativeRegExp(re1) != re1 || NativeRegExp(re2) == re2 || NativeRegExp(re1, 'i') != '/a/i';
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})));
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// `RegExp` constructor
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// https://tc39.github.io/ecma262/#sec-regexp-constructor
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if (FORCED) {
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var RegExpWrapper = function RegExp(pattern, flags) {
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var thisIsRegExp = this instanceof RegExpWrapper;
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var patternIsRegExp = isRegExp(pattern);
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var flagsAreUndefined = flags === undefined;
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var sticky;
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if (!thisIsRegExp && patternIsRegExp && pattern.constructor === RegExpWrapper && flagsAreUndefined) {
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return pattern;
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}
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if (CORRECT_NEW) {
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if (patternIsRegExp && !flagsAreUndefined) pattern = pattern.source;
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} else if (pattern instanceof RegExpWrapper) {
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if (flagsAreUndefined) flags = getFlags.call(pattern);
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pattern = pattern.source;
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}
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if (UNSUPPORTED_Y) {
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sticky = !!flags && flags.indexOf('y') > -1;
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if (sticky) flags = flags.replace(/y/g, '');
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}
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var result = inheritIfRequired(
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CORRECT_NEW ? new NativeRegExp(pattern, flags) : NativeRegExp(pattern, flags),
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thisIsRegExp ? this : RegExpPrototype,
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RegExpWrapper
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);
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if (UNSUPPORTED_Y && sticky) setInternalState(result, { sticky: sticky });
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return result;
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};
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var proxy = function (key) {
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key in RegExpWrapper || defineProperty(RegExpWrapper, key, {
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configurable: true,
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get: function () { return NativeRegExp[key]; },
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set: function (it) { NativeRegExp[key] = it; }
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});
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};
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var keys = getOwnPropertyNames(NativeRegExp);
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var index = 0;
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while (keys.length > index) proxy(keys[index++]);
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RegExpPrototype.constructor = RegExpWrapper;
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RegExpWrapper.prototype = RegExpPrototype;
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redefine(global, 'RegExp', RegExpWrapper);
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}
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// https://tc39.github.io/ecma262/#sec-get-regexp-@@species
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setSpecies('RegExp');
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