70 lines
3.2 KiB
JavaScript
70 lines
3.2 KiB
JavaScript
// @@split logic
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require('./_fix-re-wks')('split', 2, function(defined, SPLIT, $split){
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'use strict';
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var isRegExp = require('./_is-regexp')
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, _split = $split
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, $push = [].push
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, $SPLIT = 'split'
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, LENGTH = 'length'
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, LAST_INDEX = 'lastIndex';
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if(
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'abbc'[$SPLIT](/(b)*/)[1] == 'c' ||
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'test'[$SPLIT](/(?:)/, -1)[LENGTH] != 4 ||
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'ab'[$SPLIT](/(?:ab)*/)[LENGTH] != 2 ||
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'.'[$SPLIT](/(.?)(.?)/)[LENGTH] != 4 ||
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'.'[$SPLIT](/()()/)[LENGTH] > 1 ||
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''[$SPLIT](/.?/)[LENGTH]
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){
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var NPCG = /()??/.exec('')[1] === undefined; // nonparticipating capturing group
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// based on es5-shim implementation, need to rework it
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$split = function(separator, limit){
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var string = String(this);
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if(separator === undefined && limit === 0)return [];
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// If `separator` is not a regex, use native split
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if(!isRegExp(separator))return _split.call(string, separator, limit);
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var output = [];
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var flags = (separator.ignoreCase ? 'i' : '') +
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(separator.multiline ? 'm' : '') +
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(separator.unicode ? 'u' : '') +
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(separator.sticky ? 'y' : '');
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var lastLastIndex = 0;
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var splitLimit = limit === undefined ? 4294967295 : limit >>> 0;
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// Make `global` and avoid `lastIndex` issues by working with a copy
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var separatorCopy = new RegExp(separator.source, flags + 'g');
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var separator2, match, lastIndex, lastLength, i;
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// Doesn't need flags gy, but they don't hurt
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if(!NPCG)separator2 = new RegExp('^' + separatorCopy.source + '$(?!\\s)', flags);
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while(match = separatorCopy.exec(string)){
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// `separatorCopy.lastIndex` is not reliable cross-browser
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lastIndex = match.index + match[0][LENGTH];
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if(lastIndex > lastLastIndex){
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output.push(string.slice(lastLastIndex, match.index));
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// Fix browsers whose `exec` methods don't consistently return `undefined` for NPCG
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if(!NPCG && match[LENGTH] > 1)match[0].replace(separator2, function(){
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for(i = 1; i < arguments[LENGTH] - 2; i++)if(arguments[i] === undefined)match[i] = undefined;
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});
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if(match[LENGTH] > 1 && match.index < string[LENGTH])$push.apply(output, match.slice(1));
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lastLength = match[0][LENGTH];
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lastLastIndex = lastIndex;
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if(output[LENGTH] >= splitLimit)break;
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}
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if(separatorCopy[LAST_INDEX] === match.index)separatorCopy[LAST_INDEX]++; // Avoid an infinite loop
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}
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if(lastLastIndex === string[LENGTH]){
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if(lastLength || !separatorCopy.test(''))output.push('');
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} else output.push(string.slice(lastLastIndex));
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return output[LENGTH] > splitLimit ? output.slice(0, splitLimit) : output;
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};
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// Chakra, V8
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} else if('0'[$SPLIT](undefined, 0)[LENGTH]){
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$split = function(separator, limit){
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return separator === undefined && limit === 0 ? [] : _split.call(this, separator, limit);
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};
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}
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// 21.1.3.17 String.prototype.split(separator, limit)
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return [function split(separator, limit){
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var O = defined(this)
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, fn = separator == undefined ? undefined : separator[SPLIT];
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return fn !== undefined ? fn.call(separator, O, limit) : $split.call(String(O), separator, limit);
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}, $split];
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}); |