424ef009a5
Unexpectedly, websites depend on doing feature testing with RegExp.prototype.sticky and browser testing with RegExp.prototype.toString(). ES2015 newly throws exceptions for both of these. In order to enable shipping new ES2015 semantics, this patch puts in narrow workarounds for those two cases, keeping their old behavior. UseCounters are added for how often those particular cases come up, so we can see if it can be deprecated. This reland replaces problematic legacy const usage with var, to avoid issues with nosnap builds. R=yangguo CC=bmeurer BUG=v8:4637,v8:4617 LOG=Y CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1545633002 Cr-Commit-Position: refs/heads/master@{#33002}
69 lines
1.9 KiB
JavaScript
69 lines
1.9 KiB
JavaScript
// Copyright 2015 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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// Flags: --harmony-regexps --harmony-unicode-regexps
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var r1 = /abc/gi;
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assertEquals("abc", r1.source);
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assertTrue(r1.global);
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assertTrue(r1.ignoreCase);
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assertFalse(r1.multiline);
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assertFalse(r1.sticky);
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assertFalse(r1.unicode);
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// Internal slot of prototype is not read.
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var r2 = { __proto__: r1 };
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assertThrows(function() { r2.source; }, TypeError);
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assertThrows(function() { r2.global; }, TypeError);
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assertThrows(function() { r2.ignoreCase; }, TypeError);
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assertThrows(function() { r2.multiline; }, TypeError);
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assertThrows(function() { r2.sticky; }, TypeError);
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assertThrows(function() { r2.unicode; }, TypeError);
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var r3 = /I/;
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var string = "iIiIi";
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var expected = "iXiIi";
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assertFalse(r3.global);
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assertFalse(r3.ignoreCase);
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assertEquals("", r3.flags);
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assertEquals(expected, string.replace(r3, "X"));
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var get_count = 0;
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Object.defineProperty(r3, "global", {
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get: function() { get_count++; return true; }
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});
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Object.defineProperty(r3, "ignoreCase", {
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get: function() { get_count++; return true; }
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});
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assertTrue(r3.global);
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assertEquals(1, get_count);
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assertTrue(r3.ignoreCase);
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assertEquals(2, get_count);
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// Overridden flag getters affects the flags getter.
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assertEquals("gi", r3.flags);
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assertEquals(4, get_count);
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// Overridden flag getters do not affect the internal flags.
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assertEquals(expected, string.replace(r3, "X"));
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assertEquals(4, get_count);
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function testName(name) {
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if (name === "sticky") {
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assertEquals(undefined, RegExp.prototype[name]);
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} else {
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assertThrows(() => RegExp.prototype[name], TypeError);
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}
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assertEquals(
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"get " + name,
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Object.getOwnPropertyDescriptor(RegExp.prototype, name).get.name);
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}
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testName("global");
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testName("ignoreCase");
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testName("multiline");
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testName("source");
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testName("sticky");
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testName("unicode");
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