43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
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// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Ensure that we have the correct number of accesses to exec in split, and
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// that exec is called at the correct point in time.
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var lastIndexHasBeenSet = false;
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var countOfExecGets = 0;
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// Force the slow path and make sure the created splitter object has our
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// overwritten exec method (@@split does not call exec on the original regexp
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// but on a newly-created splitter which is guaranteed to be sticky).
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class ObservableExecRegExp extends RegExp {
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constructor(pattern, flags) {
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super(pattern, flags);
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this.lastIndex = 42;
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const re = this;
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Object.defineProperty(this, "exec", {
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get: function() {
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// Ensure exec is first accessed after lastIndex has been reset to
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// satisfy the spec.
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assertTrue(re.lastIndex != 42);
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countOfExecGets++;
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return RegExp.prototype.exec;
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}
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});
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}
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}
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var re = new ObservableExecRegExp(/x/);
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assertEquals(42, re.lastIndex);
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assertEquals(0, countOfExecGets);
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var result = "axbxc".split(re);
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assertEquals(5, countOfExecGets);
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assertEquals(["a", "b", "c"], result);
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