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- 'use strict';
- var call = require('../internals/function-call');
- var uncurryThis = require('../internals/function-uncurry-this');
- var fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');
- var anObject = require('../internals/an-object');
- var isNullOrUndefined = require('../internals/is-null-or-undefined');
- 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 regExpExec = require('../internals/regexp-exec-abstract');
- 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 = 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';
- });
-
- var BUGGY = '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;
-
- // @@split logic
- fixRegExpWellKnownSymbolLogic('split', function (SPLIT, nativeSplit, maybeCallNative) {
- var internalSplit = '0'.split(undefined, 0).length ? function (separator, limit) {
- return separator === undefined && limit === 0 ? [] : call(nativeSplit, this, separator, limit);
- } : nativeSplit;
-
- return [
- // `String.prototype.split` method
- // https://tc39.es/ecma262/#sec-string.prototype.split
- function split(separator, limit) {
- var O = requireObjectCoercible(this);
- var splitter = isNullOrUndefined(separator) ? 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);
-
- if (!BUGGY) {
- 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 regExpExec(splitter, S) === null ? [S] : [];
- var p = 0;
- var q = 0;
- var A = [];
- while (q < S.length) {
- splitter.lastIndex = UNSUPPORTED_Y ? 0 : q;
- var z = regExpExec(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;
- }
- ];
- }, BUGGY || !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC, UNSUPPORTED_Y);
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