es.regexp.constructor.js
3.07 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
var DESCRIPTORS = require('../internals/descriptors');
var global = require('../internals/global');
var isForced = require('../internals/is-forced');
var inheritIfRequired = require('../internals/inherit-if-required');
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 setInternalState = require('../internals/internal-state').set;
var setSpecies = require('../internals/set-species');
var wellKnownSymbol = require('../internals/well-known-symbol');
var MATCH = wellKnownSymbol('match');
var NativeRegExp = global.RegExp;
var RegExpPrototype = NativeRegExp.prototype;
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 FORCED = DESCRIPTORS && isForced('RegExp', (!CORRECT_NEW || UNSUPPORTED_Y || 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';
})));
// `RegExp` constructor
// https://tc39.github.io/ecma262/#sec-regexp-constructor
if (FORCED) {
var RegExpWrapper = function RegExp(pattern, flags) {
var thisIsRegExp = this instanceof RegExpWrapper;
var patternIsRegExp = isRegExp(pattern);
var flagsAreUndefined = flags === undefined;
var sticky;
if (!thisIsRegExp && patternIsRegExp && pattern.constructor === RegExpWrapper && flagsAreUndefined) {
return pattern;
}
if (CORRECT_NEW) {
if (patternIsRegExp && !flagsAreUndefined) pattern = pattern.source;
} else if (pattern instanceof RegExpWrapper) {
if (flagsAreUndefined) flags = getFlags.call(pattern);
pattern = pattern.source;
}
if (UNSUPPORTED_Y) {
sticky = !!flags && flags.indexOf('y') > -1;
if (sticky) flags = flags.replace(/y/g, '');
}
var result = inheritIfRequired(
CORRECT_NEW ? new NativeRegExp(pattern, flags) : NativeRegExp(pattern, flags),
thisIsRegExp ? this : RegExpPrototype,
RegExpWrapper
);
if (UNSUPPORTED_Y && sticky) setInternalState(result, { sticky: sticky });
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; }
});
};
var keys = getOwnPropertyNames(NativeRegExp);
var index = 0;
while (keys.length > index) proxy(keys[index++]);
RegExpPrototype.constructor = RegExpWrapper;
RegExpWrapper.prototype = RegExpPrototype;
redefine(global, 'RegExp', RegExpWrapper);
}
// https://tc39.github.io/ecma262/#sec-get-regexp-@@species
setSpecies('RegExp');