| // @@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]; |
| }); |