2 /* eslint-disable regexp/no-empty-capturing-group, regexp/no-empty-group, regexp/no-lazy-ends -- testing */
3 /* eslint-disable regexp/no-useless-quantifier -- testing */
4 var call = require('../internals/function-call');
5 var uncurryThis = require('../internals/function-uncurry-this');
6 var toString = require('../internals/to-string');
7 var regexpFlags = require('../internals/regexp-flags');
8 var stickyHelpers = require('../internals/regexp-sticky-helpers');
9 var shared = require('../internals/shared');
10 var create = require('../internals/object-create');
11 var getInternalState = require('../internals/internal-state').get;
12 var UNSUPPORTED_DOT_ALL = require('../internals/regexp-unsupported-dot-all');
13 var UNSUPPORTED_NCG = require('../internals/regexp-unsupported-ncg');
15 var nativeReplace = shared('native-string-replace', String.prototype.replace);
16 var nativeExec = RegExp.prototype.exec;
17 var patchedExec = nativeExec;
18 var charAt = uncurryThis(''.charAt);
19 var indexOf = uncurryThis(''.indexOf);
20 var replace = uncurryThis(''.replace);
21 var stringSlice = uncurryThis(''.slice);
23 var UPDATES_LAST_INDEX_WRONG = (function () {
26 call(nativeExec, re1, 'a');
27 call(nativeExec, re2, 'a');
28 return re1.lastIndex !== 0 || re2.lastIndex !== 0;
31 var UNSUPPORTED_Y = stickyHelpers.BROKEN_CARET;
33 // nonparticipating capturing group, copied from es5-shim's String#split patch.
34 var NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;
36 var PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y || UNSUPPORTED_DOT_ALL || UNSUPPORTED_NCG;
39 patchedExec = function exec(string) {
41 var state = getInternalState(re);
42 var str = toString(string);
44 var result, reCopy, lastIndex, match, i, object, group;
47 raw.lastIndex = re.lastIndex;
48 result = call(patchedExec, raw, str);
49 re.lastIndex = raw.lastIndex;
53 var groups = state.groups;
54 var sticky = UNSUPPORTED_Y && re.sticky;
55 var flags = call(regexpFlags, re);
56 var source = re.source;
61 flags = replace(flags, 'y', '');
62 if (indexOf(flags, 'g') === -1) {
66 strCopy = stringSlice(str, re.lastIndex);
67 // Support anchored sticky behavior.
68 if (re.lastIndex > 0 && (!re.multiline || re.multiline && charAt(str, re.lastIndex - 1) !== '\n')) {
69 source = '(?: ' + source + ')';
70 strCopy = ' ' + strCopy;
73 // ^(? + rx + ) is needed, in combination with some str slicing, to
74 // simulate the 'y' flag.
75 reCopy = new RegExp('^(?:' + source + ')', flags);
79 reCopy = new RegExp('^' + source + '$(?!\\s)', flags);
81 if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;
83 match = call(nativeExec, sticky ? reCopy : re, strCopy);
87 match.input = stringSlice(match.input, charsAdded);
88 match[0] = stringSlice(match[0], charsAdded);
89 match.index = re.lastIndex;
90 re.lastIndex += match[0].length;
91 } else re.lastIndex = 0;
92 } else if (UPDATES_LAST_INDEX_WRONG && match) {
93 re.lastIndex = re.global ? match.index + match[0].length : lastIndex;
95 if (NPCG_INCLUDED && match && match.length > 1) {
96 // Fix browsers whose `exec` methods don't consistently return `undefined`
97 // for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/
98 call(nativeReplace, match[0], reCopy, function () {
99 for (i = 1; i < arguments.length - 2; i++) {
100 if (arguments[i] === undefined) match[i] = undefined;
105 if (match && groups) {
106 match.groups = object = create(null);
107 for (i = 0; i < groups.length; i++) {
109 object[group[0]] = match[group[1]];
117 module.exports = patchedExec;