22 lines
851 B
JavaScript
22 lines
851 B
JavaScript
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// Copyright 2018 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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// Produce an fast, but empty result.
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const fast_regexp_result = /./g.exec("a");
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fast_regexp_result.length = 0;
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class RegExpWithFastResult extends RegExp {
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constructor() { super(".", "g"); this.number_of_runs = 0; }
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exec(str) { return (this.number_of_runs++ == 0) ? fast_regexp_result : null; }
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}
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// A slow empty result.
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const slow_regexp_result = [];
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class RegExpWithSlowResult extends RegExp {
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constructor() { super(".", "g"); this.number_of_runs = 0; }
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exec(str) { return (this.number_of_runs++ == 0) ? slow_regexp_result : null; }
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}
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assertEquals(["undefined"], "a".match(new RegExpWithFastResult()));
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assertEquals(["undefined"], "a".match(new RegExpWithSlowResult()));
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