77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
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'use strict';
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// TODO: Remove from `core-js@4` since it's moved to entry points
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require('../modules/es.regexp.exec');
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var call = require('../internals/function-call');
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var defineBuiltIn = require('../internals/define-built-in');
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var regexpExec = require('../internals/regexp-exec');
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var fails = require('../internals/fails');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var SPECIES = wellKnownSymbol('species');
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var RegExpPrototype = RegExp.prototype;
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module.exports = function (KEY, exec, FORCED, SHAM) {
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var SYMBOL = wellKnownSymbol(KEY);
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var DELEGATES_TO_SYMBOL = !fails(function () {
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// String methods call symbol-named RegExp methods
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var O = {};
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O[SYMBOL] = function () { return 7; };
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return ''[KEY](O) !== 7;
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});
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var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {
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// Symbol-named RegExp methods call .exec
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var execCalled = false;
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var re = /a/;
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if (KEY === 'split') {
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// We can't use real regex here since it causes deoptimization
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// and serious performance degradation in V8
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// https://github.com/zloirock/core-js/issues/306
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re = {};
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// RegExp[@@split] doesn't call the regex's exec method, but first creates
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// a new one. We need to return the patched regex when creating the new one.
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re.constructor = {};
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re.constructor[SPECIES] = function () { return re; };
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re.flags = '';
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re[SYMBOL] = /./[SYMBOL];
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}
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re.exec = function () {
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execCalled = true;
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return null;
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};
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re[SYMBOL]('');
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return !execCalled;
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});
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if (
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!DELEGATES_TO_SYMBOL ||
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!DELEGATES_TO_EXEC ||
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FORCED
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) {
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var nativeRegExpMethod = /./[SYMBOL];
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var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
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var $exec = regexp.exec;
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if ($exec === regexpExec || $exec === RegExpPrototype.exec) {
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if (DELEGATES_TO_SYMBOL && !forceStringMethod) {
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// The native String method already delegates to @@method (this
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// polyfilled function), leasing to infinite recursion.
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// We avoid it by directly calling the native @@method method.
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return { done: true, value: call(nativeRegExpMethod, regexp, str, arg2) };
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}
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return { done: true, value: call(nativeMethod, str, regexp, arg2) };
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}
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return { done: false };
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});
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defineBuiltIn(String.prototype, KEY, methods[0]);
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defineBuiltIn(RegExpPrototype, SYMBOL, methods[1]);
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}
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if (SHAM) createNonEnumerableProperty(RegExpPrototype[SYMBOL], 'sham', true);
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};
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