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112 lines
4.5 KiB
112 lines
4.5 KiB
'use strict';
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var call = require('../internals/function-call');
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var uncurryThis = require('../internals/function-uncurry-this');
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var fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');
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var anObject = require('../internals/an-object');
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var isNullOrUndefined = require('../internals/is-null-or-undefined');
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var requireObjectCoercible = require('../internals/require-object-coercible');
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var speciesConstructor = require('../internals/species-constructor');
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var advanceStringIndex = require('../internals/advance-string-index');
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var toLength = require('../internals/to-length');
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var toString = require('../internals/to-string');
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var getMethod = require('../internals/get-method');
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var regExpExec = require('../internals/regexp-exec-abstract');
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var stickyHelpers = require('../internals/regexp-sticky-helpers');
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var fails = require('../internals/fails');
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var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
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var MAX_UINT32 = 0xFFFFFFFF;
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var min = Math.min;
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var push = uncurryThis([].push);
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var stringSlice = uncurryThis(''.slice);
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// Chrome 51 has a buggy "split" implementation when RegExp#exec !== nativeExec
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// Weex JS has frozen built-in prototypes, so use try / catch wrapper
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var SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {
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// eslint-disable-next-line regexp/no-empty-group -- required for testing
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var re = /(?:)/;
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var originalExec = re.exec;
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re.exec = function () { return originalExec.apply(this, arguments); };
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var result = 'ab'.split(re);
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return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';
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});
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var BUGGY = 'abbc'.split(/(b)*/)[1] === 'c' ||
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// eslint-disable-next-line regexp/no-empty-group -- required for testing
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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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// eslint-disable-next-line regexp/no-empty-capturing-group, regexp/no-empty-group -- required for testing
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'.'.split(/()()/).length > 1 ||
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''.split(/.?/).length;
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// @@split logic
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fixRegExpWellKnownSymbolLogic('split', function (SPLIT, nativeSplit, maybeCallNative) {
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var internalSplit = '0'.split(undefined, 0).length ? function (separator, limit) {
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return separator === undefined && limit === 0 ? [] : call(nativeSplit, this, separator, limit);
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} : nativeSplit;
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return [
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// `String.prototype.split` method
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// https://tc39.es/ecma262/#sec-string.prototype.split
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function split(separator, limit) {
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var O = requireObjectCoercible(this);
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var splitter = isNullOrUndefined(separator) ? undefined : getMethod(separator, SPLIT);
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return splitter
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? call(splitter, separator, O, limit)
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: call(internalSplit, toString(O), separator, limit);
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},
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// `RegExp.prototype[@@split]` method
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// https://tc39.es/ecma262/#sec-regexp.prototype-@@split
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//
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// NOTE: This cannot be properly polyfilled in engines that don't support
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// the 'y' flag.
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function (string, limit) {
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var rx = anObject(this);
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var S = toString(string);
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if (!BUGGY) {
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var res = maybeCallNative(internalSplit, rx, S, limit, internalSplit !== nativeSplit);
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if (res.done) return res.value;
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}
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var C = speciesConstructor(rx, RegExp);
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var unicodeMatching = rx.unicode;
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var flags = (rx.ignoreCase ? 'i' : '') +
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(rx.multiline ? 'm' : '') +
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(rx.unicode ? 'u' : '') +
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(UNSUPPORTED_Y ? 'g' : 'y');
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// ^(? + rx + ) is needed, in combination with some S slicing, to
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// simulate the 'y' flag.
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var splitter = new C(UNSUPPORTED_Y ? '^(?:' + rx.source + ')' : rx, flags);
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var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
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if (lim === 0) return [];
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if (S.length === 0) return regExpExec(splitter, S) === null ? [S] : [];
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var p = 0;
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var q = 0;
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var A = [];
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while (q < S.length) {
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splitter.lastIndex = UNSUPPORTED_Y ? 0 : q;
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var z = regExpExec(splitter, UNSUPPORTED_Y ? stringSlice(S, q) : S);
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var e;
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if (
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z === null ||
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(e = min(toLength(splitter.lastIndex + (UNSUPPORTED_Y ? q : 0)), S.length)) === p
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) {
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q = advanceStringIndex(S, q, unicodeMatching);
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} else {
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push(A, stringSlice(S, p, q));
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if (A.length === lim) return A;
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for (var i = 1; i <= z.length - 1; i++) {
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push(A, z[i]);
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if (A.length === lim) return A;
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}
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q = p = e;
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}
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}
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push(A, stringSlice(S, p));
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return A;
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}
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];
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}, BUGGY || !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC, UNSUPPORTED_Y);
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