es6.regexp.split.js
3.32 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
// @@split logic
require('./_fix-re-wks')('split', 2, function (defined, SPLIT, $split) {
'use strict';
var isRegExp = require('./_is-regexp');
var _split = $split;
var $push = [].push;
var $SPLIT = 'split';
var LENGTH = 'length';
var LAST_INDEX = 'lastIndex';
if (
'abbc'[$SPLIT](/(b)*/)[1] == 'c' ||
'test'[$SPLIT](/(?:)/, -1)[LENGTH] != 4 ||
'ab'[$SPLIT](/(?:ab)*/)[LENGTH] != 2 ||
'.'[$SPLIT](/(.?)(.?)/)[LENGTH] != 4 ||
'.'[$SPLIT](/()()/)[LENGTH] > 1 ||
''[$SPLIT](/.?/)[LENGTH]
) {
var NPCG = /()??/.exec('')[1] === undefined; // nonparticipating capturing group
// based on es5-shim implementation, need to rework it
$split = function (separator, limit) {
var string = String(this);
if (separator === undefined && limit === 0) return [];
// If `separator` is not a regex, use native split
if (!isRegExp(separator)) return _split.call(string, separator, limit);
var output = [];
var flags = (separator.ignoreCase ? 'i' : '') +
(separator.multiline ? 'm' : '') +
(separator.unicode ? 'u' : '') +
(separator.sticky ? 'y' : '');
var lastLastIndex = 0;
var splitLimit = limit === undefined ? 4294967295 : limit >>> 0;
// Make `global` and avoid `lastIndex` issues by working with a copy
var separatorCopy = new RegExp(separator.source, flags + 'g');
var separator2, match, lastIndex, lastLength, i;
// Doesn't need flags gy, but they don't hurt
if (!NPCG) separator2 = new RegExp('^' + separatorCopy.source + '$(?!\\s)', flags);
while (match = separatorCopy.exec(string)) {
// `separatorCopy.lastIndex` is not reliable cross-browser
lastIndex = match.index + match[0][LENGTH];
if (lastIndex > lastLastIndex) {
output.push(string.slice(lastLastIndex, match.index));
// Fix browsers whose `exec` methods don't consistently return `undefined` for NPCG
// eslint-disable-next-line no-loop-func
if (!NPCG && match[LENGTH] > 1) match[0].replace(separator2, function () {
for (i = 1; i < arguments[LENGTH] - 2; i++) if (arguments[i] === undefined) match[i] = undefined;
});
if (match[LENGTH] > 1 && match.index < string[LENGTH]) $push.apply(output, match.slice(1));
lastLength = match[0][LENGTH];
lastLastIndex = lastIndex;
if (output[LENGTH] >= splitLimit) break;
}
if (separatorCopy[LAST_INDEX] === match.index) separatorCopy[LAST_INDEX]++; // Avoid an infinite loop
}
if (lastLastIndex === string[LENGTH]) {
if (lastLength || !separatorCopy.test('')) output.push('');
} else output.push(string.slice(lastLastIndex));
return output[LENGTH] > splitLimit ? output.slice(0, splitLimit) : output;
};
// Chakra, V8
} else if ('0'[$SPLIT](undefined, 0)[LENGTH]) {
$split = function (separator, limit) {
return separator === undefined && limit === 0 ? [] : _split.call(this, separator, limit);
};
}
// 21.1.3.17 String.prototype.split(separator, limit)
return [function split(separator, limit) {
var O = defined(this);
var fn = separator == undefined ? undefined : separator[SPLIT];
return fn !== undefined ? fn.call(separator, O, limit) : $split.call(String(O), separator, limit);
}, $split];
});