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// @@split logic
require('./_fix-re-wks')('split', 2, function(defined, SPLIT, $split){
'use strict';
var isRegExp = require('./_is-regexp')
, _split = $split
, $push = [].push
, $SPLIT = 'split'
, LENGTH = 'length'
, LAST_INDEX = 'lastIndex';
if(
'abbc'[$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
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)
, fn = separator == undefined ? undefined : separator[SPLIT];
return fn !== undefined ? fn.call(separator, O, limit) : $split.call(String(O), separator, limit);
}, $split];
});
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