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- var DESCRIPTORS = require('../internals/descriptors');
- var global = require('../internals/global');
- var isForced = require('../internals/is-forced');
- var inheritIfRequired = require('../internals/inherit-if-required');
- var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
- var defineProperty = require('../internals/object-define-property').f;
- var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
- var isRegExp = require('../internals/is-regexp');
- var getFlags = require('../internals/regexp-flags');
- var stickyHelpers = require('../internals/regexp-sticky-helpers');
- var redefine = require('../internals/redefine');
- var fails = require('../internals/fails');
- var has = require('../internals/has');
- var enforceInternalState = require('../internals/internal-state').enforce;
- var setSpecies = require('../internals/set-species');
- var wellKnownSymbol = require('../internals/well-known-symbol');
- var UNSUPPORTED_DOT_ALL = require('../internals/regexp-unsupported-dot-all');
- var UNSUPPORTED_NCG = require('../internals/regexp-unsupported-ncg');
-
- var MATCH = wellKnownSymbol('match');
- var NativeRegExp = global.RegExp;
- var RegExpPrototype = NativeRegExp.prototype;
- // TODO: Use only propper RegExpIdentifierName
- var IS_NCG = /^\?<[^\s\d!#%&*+<=>@^][^\s!#%&*+<=>@^]*>/;
- var re1 = /a/g;
- var re2 = /a/g;
-
- // "new" should create a new object, old webkit bug
- var CORRECT_NEW = new NativeRegExp(re1) !== re1;
-
- var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
-
- var BASE_FORCED = DESCRIPTORS &&
- (!CORRECT_NEW || UNSUPPORTED_Y || UNSUPPORTED_DOT_ALL || UNSUPPORTED_NCG || fails(function () {
- re2[MATCH] = false;
- // RegExp constructor can alter flags and IsRegExp works correct with @@match
- return NativeRegExp(re1) != re1 || NativeRegExp(re2) == re2 || NativeRegExp(re1, 'i') != '/a/i';
- }));
-
- var handleDotAll = function (string) {
- var length = string.length;
- var index = 0;
- var result = '';
- var brackets = false;
- var chr;
- for (; index <= length; index++) {
- chr = string.charAt(index);
- if (chr === '\\') {
- result += chr + string.charAt(++index);
- continue;
- }
- if (!brackets && chr === '.') {
- result += '[\\s\\S]';
- } else {
- if (chr === '[') {
- brackets = true;
- } else if (chr === ']') {
- brackets = false;
- } result += chr;
- }
- } return result;
- };
-
- var handleNCG = function (string) {
- var length = string.length;
- var index = 0;
- var result = '';
- var named = [];
- var names = {};
- var brackets = false;
- var ncg = false;
- var groupid = 0;
- var groupname = '';
- var chr;
- for (; index <= length; index++) {
- chr = string.charAt(index);
- if (chr === '\\') {
- chr = chr + string.charAt(++index);
- } else if (chr === ']') {
- brackets = false;
- } else if (!brackets) switch (true) {
- case chr === '[':
- brackets = true;
- break;
- case chr === '(':
- if (IS_NCG.test(string.slice(index + 1))) {
- index += 2;
- ncg = true;
- }
- result += chr;
- groupid++;
- continue;
- case chr === '>' && ncg:
- if (groupname === '' || has(names, groupname)) {
- throw new SyntaxError('Invalid capture group name');
- }
- names[groupname] = true;
- named.push([groupname, groupid]);
- ncg = false;
- groupname = '';
- continue;
- }
- if (ncg) groupname += chr;
- else result += chr;
- } return [result, named];
- };
-
- // `RegExp` constructor
- // https://tc39.es/ecma262/#sec-regexp-constructor
- if (isForced('RegExp', BASE_FORCED)) {
- var RegExpWrapper = function RegExp(pattern, flags) {
- var thisIsRegExp = this instanceof RegExpWrapper;
- var patternIsRegExp = isRegExp(pattern);
- var flagsAreUndefined = flags === undefined;
- var groups = [];
- var rawPattern = pattern;
- var rawFlags, dotAll, sticky, handled, result, state;
-
- if (!thisIsRegExp && patternIsRegExp && flagsAreUndefined && pattern.constructor === RegExpWrapper) {
- return pattern;
- }
-
- if (patternIsRegExp || pattern instanceof RegExpWrapper) {
- pattern = pattern.source;
- if (flagsAreUndefined) flags = 'flags' in rawPattern ? rawPattern.flags : getFlags.call(rawPattern);
- }
-
- pattern = pattern === undefined ? '' : String(pattern);
- flags = flags === undefined ? '' : String(flags);
- rawPattern = pattern;
-
- if (UNSUPPORTED_DOT_ALL && 'dotAll' in re1) {
- dotAll = !!flags && flags.indexOf('s') > -1;
- if (dotAll) flags = flags.replace(/s/g, '');
- }
-
- rawFlags = flags;
-
- if (UNSUPPORTED_Y && 'sticky' in re1) {
- sticky = !!flags && flags.indexOf('y') > -1;
- if (sticky) flags = flags.replace(/y/g, '');
- }
-
- if (UNSUPPORTED_NCG) {
- handled = handleNCG(pattern);
- pattern = handled[0];
- groups = handled[1];
- }
-
- result = inheritIfRequired(NativeRegExp(pattern, flags), thisIsRegExp ? this : RegExpPrototype, RegExpWrapper);
-
- if (dotAll || sticky || groups.length) {
- state = enforceInternalState(result);
- if (dotAll) {
- state.dotAll = true;
- state.raw = RegExpWrapper(handleDotAll(pattern), rawFlags);
- }
- if (sticky) state.sticky = true;
- if (groups.length) state.groups = groups;
- }
-
- if (pattern !== rawPattern) try {
- // fails in old engines, but we have no alternatives for unsupported regex syntax
- createNonEnumerableProperty(result, 'source', rawPattern === '' ? '(?:)' : rawPattern);
- } catch (error) { /* empty */ }
-
- return result;
- };
-
- var proxy = function (key) {
- key in RegExpWrapper || defineProperty(RegExpWrapper, key, {
- configurable: true,
- get: function () { return NativeRegExp[key]; },
- set: function (it) { NativeRegExp[key] = it; }
- });
- };
-
- for (var keys = getOwnPropertyNames(NativeRegExp), index = 0; keys.length > index;) {
- proxy(keys[index++]);
- }
-
- RegExpPrototype.constructor = RegExpWrapper;
- RegExpWrapper.prototype = RegExpPrototype;
- redefine(global, 'RegExp', RegExpWrapper);
- }
-
- // https://tc39.es/ecma262/#sec-get-regexp-@@species
- setSpecies('RegExp');
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