277f5bd0a3
- RegExp.prototype.toString() doesn't have any special handling of RegExp instances and simply calls the source and flags getters - Use the original values of global and sticky, rather than based on the current flag getters, as specified in https://github.com/tc39/ecma262/pull/494 R=yangguo@chromium.org,adamk LOG=Y BUG=v8:4602 Review URL: https://codereview.chromium.org/1846303002 Cr-Commit-Position: refs/heads/master@{#35225}
58 lines
1.3 KiB
JavaScript
58 lines
1.3 KiB
JavaScript
// 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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var log = [];
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var fake =
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{
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get source() {
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log.push("p");
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return {
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toString: function() {
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log.push("ps");
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return "pattern";
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}
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};
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},
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get flags() {
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log.push("f");
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return {
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toString: function() {
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log.push("fs");
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return "flags";
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}
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};
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}
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}
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function testThrows(x) {
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try {
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RegExp.prototype.toString.call(x);
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} catch (e) {
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assertTrue(/incompatible receiver/.test(e.message));
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return;
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}
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assertUnreachable();
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}
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testThrows(1);
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testThrows(null);
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Number.prototype.source = "a";
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Number.prototype.flags = "b";
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testThrows(1);
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assertEquals("/pattern/flags", RegExp.prototype.toString.call(fake));
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assertEquals(["p", "ps", "f", "fs"], log);
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// Monkey-patching is also possible on RegExp instances
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let weird = /foo/;
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Object.defineProperty(weird, 'flags', {value: 'bar'});
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Object.defineProperty(weird, 'source', {value: 'baz'});
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assertEquals('/baz/bar', weird.toString());
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assertEquals('/(?:)/', RegExp.prototype.toString());
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assertEquals('(?:)', RegExp.prototype.source);
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assertEquals('', RegExp.prototype.flags);
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