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es.string.split.js
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es.string.split.js
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'use strict';
var apply = require('../internals/function-apply');
var call = require('../internals/function-call');
var uncurryThis = require('../internals/function-uncurry-this');
var fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');
var isRegExp = require('../internals/is-regexp');
var anObject = require('../internals/an-object');
var requireObjectCoercible = require('../internals/require-object-coercible');
var speciesConstructor = require('../internals/species-constructor');
var advanceStringIndex = require('../internals/advance-string-index');
var toLength = require('../internals/to-length');
var toString = require('../internals/to-string');
var getMethod = require('../internals/get-method');
var arraySlice = require('../internals/array-slice-simple');
var callRegExpExec = require('../internals/regexp-exec-abstract');
var regexpExec = require('../internals/regexp-exec');
var stickyHelpers = require('../internals/regexp-sticky-helpers');
var fails = require('../internals/fails');
var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
var MAX_UINT32 = 0xFFFFFFFF;
var min = Math.min;
var $push = [].push;
var exec = uncurryThis(/./.exec);
var push = uncurryThis($push);
var stringSlice = uncurryThis(''.slice);
// Chrome 51 has a buggy "split" implementation when RegExp#exec !== nativeExec
// Weex JS has frozen built-in prototypes, so use try / catch wrapper
var SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {
// eslint-disable-next-line regexp/no-empty-group -- required for testing
var re = /(?:)/;
var originalExec = re.exec;
re.exec = function () { return originalExec.apply(this, arguments); };
var result = 'ab'.split(re);
return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';
});
// @@split logic
fixRegExpWellKnownSymbolLogic('split', function (SPLIT, nativeSplit, maybeCallNative) {
var internalSplit;
if (
'abbc'.split(/(b)*/)[1] == 'c' ||
// eslint-disable-next-line regexp/no-empty-group -- required for testing
'test'.split(/(?:)/, -1).length != 4 ||
'ab'.split(/(?:ab)*/).length != 2 ||
'.'.split(/(.?)(.?)/).length != 4 ||
// eslint-disable-next-line regexp/no-empty-capturing-group, regexp/no-empty-group -- required for testing
'.'.split(/()()/).length > 1 ||
''.split(/.?/).length
) {
// based on es5-shim implementation, need to rework it
internalSplit = function (separator, limit) {
var string = toString(requireObjectCoercible(this));
var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
if (lim === 0) return [];
if (separator === undefined) return [string];
// If `separator` is not a regex, use native split
if (!isRegExp(separator)) {
return call(nativeSplit, string, separator, lim);
}
var output = [];
var flags = (separator.ignoreCase ? 'i' : '') +
(separator.multiline ? 'm' : '') +
(separator.unicode ? 'u' : '') +
(separator.sticky ? 'y' : '');
var lastLastIndex = 0;
// Make `global` and avoid `lastIndex` issues by working with a copy
var separatorCopy = new RegExp(separator.source, flags + 'g');
var match, lastIndex, lastLength;
while (match = call(regexpExec, separatorCopy, string)) {
lastIndex = separatorCopy.lastIndex;
if (lastIndex > lastLastIndex) {
push(output, stringSlice(string, lastLastIndex, match.index));
if (match.length > 1 && match.index < string.length) apply($push, output, arraySlice(match, 1));
lastLength = match[0].length;
lastLastIndex = lastIndex;
if (output.length >= lim) break;
}
if (separatorCopy.lastIndex === match.index) separatorCopy.lastIndex++; // Avoid an infinite loop
}
if (lastLastIndex === string.length) {
if (lastLength || !exec(separatorCopy, '')) push(output, '');
} else push(output, stringSlice(string, lastLastIndex));
return output.length > lim ? arraySlice(output, 0, lim) : output;
};
// Chakra, V8
} else if ('0'.split(undefined, 0).length) {
internalSplit = function (separator, limit) {
return separator === undefined && limit === 0 ? [] : call(nativeSplit, this, separator, limit);
};
} else internalSplit = nativeSplit;
return [
// `String.prototype.split` method
// https://tc39.es/ecma262/#sec-string.prototype.split
function split(separator, limit) {
var O = requireObjectCoercible(this);
var splitter = separator == undefined ? undefined : getMethod(separator, SPLIT);
return splitter
? call(splitter, separator, O, limit)
: call(internalSplit, toString(O), separator, limit);
},
// `RegExp.prototype[@@split]` method
// https://tc39.es/ecma262/#sec-regexp.prototype-@@split
//
// NOTE: This cannot be properly polyfilled in engines that don't support
// the 'y' flag.
function (string, limit) {
var rx = anObject(this);
var S = toString(string);
var res = maybeCallNative(internalSplit, rx, S, limit, internalSplit !== nativeSplit);
if (res.done) return res.value;
var C = speciesConstructor(rx, RegExp);
var unicodeMatching = rx.unicode;
var flags = (rx.ignoreCase ? 'i' : '') +
(rx.multiline ? 'm' : '') +
(rx.unicode ? 'u' : '') +
(UNSUPPORTED_Y ? 'g' : 'y');
// ^(? + rx + ) is needed, in combination with some S slicing, to
// simulate the 'y' flag.
var splitter = new C(UNSUPPORTED_Y ? '^(?:' + rx.source + ')' : rx, flags);
var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
if (lim === 0) return [];
if (S.length === 0) return callRegExpExec(splitter, S) === null ? [S] : [];
var p = 0;
var q = 0;
var A = [];
while (q < S.length) {
splitter.lastIndex = UNSUPPORTED_Y ? 0 : q;
var z = callRegExpExec(splitter, UNSUPPORTED_Y ? stringSlice(S, q) : S);
var e;
if (
z === null ||
(e = min(toLength(splitter.lastIndex + (UNSUPPORTED_Y ? q : 0)), S.length)) === p
) {
q = advanceStringIndex(S, q, unicodeMatching);
} else {
push(A, stringSlice(S, p, q));
if (A.length === lim) return A;
for (var i = 1; i <= z.length - 1; i++) {
push(A, z[i]);
if (A.length === lim) return A;
}
q = p = e;
}
}
push(A, stringSlice(S, p));
return A;
}
];
}, !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC, UNSUPPORTED_Y);

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