54 lines
2.7 KiB
JavaScript
54 lines
2.7 KiB
JavaScript
description(
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"This page tests that a RegExp object's lastIndex behaves like a regular property."
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);
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// lastIndex is not configurable
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shouldBeFalse("delete /x/.lastIndex");
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shouldThrow("'use strict'; delete /x/.lastIndex");
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// lastIndex is not enumerable
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shouldBeTrue("'lastIndex' in /x/");
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shouldBeTrue("for (property in /x/) if (property === 'lastIndex') throw false; true");
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// lastIndex is writable
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shouldBeTrue("var re = /x/; re.lastIndex = re; re.lastIndex === re");
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// Cannot redefine lastIndex as an accessor
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shouldThrow("Object.defineProperty(/x/, {get:function(){}})");
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// Cannot redefine lastIndex as enumerable
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shouldThrow("Object.defineProperty(/x/, 'lastIndex', {enumerable:true}); true");
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shouldBeTrue("Object.defineProperty(/x/, 'lastIndex', {enumerable:false}); true");
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// Cannot redefine lastIndex as configurable
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shouldThrow("Object.defineProperty(/x/, 'lastIndex', {configurable:true}); true");
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shouldBeTrue("Object.defineProperty(/x/, 'lastIndex', {configurable:false}); true");
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// Can redefine lastIndex as read-only
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shouldBe("var re = Object.defineProperty(/x/, 'lastIndex', {writable:true}); re.lastIndex = 42; re.lastIndex", '42');
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shouldBe("var re = Object.defineProperty(/x/, 'lastIndex', {writable:false}); re.lastIndex = 42; re.lastIndex", '0');
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// Can redefine the value
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shouldBe("var re = Object.defineProperty(/x/, 'lastIndex', {value:42}); re.lastIndex", '42');
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// Cannot redefine read-only lastIndex as writable
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shouldThrow("Object.defineProperty(Object.defineProperty(/x/, 'lastIndex', {writable:false}), 'lastIndex', {writable:true}); true");
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// Can only redefine the value of a read-only lastIndex as the current value
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shouldThrow("Object.defineProperty(Object.defineProperty(/x/, 'lastIndex', {writable:false}), 'lastIndex', {value:42}); true");
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shouldBeTrue("Object.defineProperty(Object.defineProperty(/x/, 'lastIndex', {writable:false}), 'lastIndex', {value:0}); true");
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// Trying to run a global regular expression should throw, if lastIndex is read-only
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shouldBe("Object.defineProperty(/x/, 'lastIndex', {writable:false}).exec('')", 'null');
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shouldBe("Object.defineProperty(/x/, 'lastIndex', {writable:false}).exec('x')", '["x"]');
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shouldThrow("Object.defineProperty(/x/g, 'lastIndex', {writable:false}).exec('')");
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shouldThrow("Object.defineProperty(/x/g, 'lastIndex', {writable:false}).exec('x')");
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// Should be able to freeze a regular expression object.
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shouldBeTrue("var re = /x/; Object.freeze(re); Object.isFrozen(re);");
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// Presence of setter on prototype chain should not affect RegexpMatchesArray
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shouldBe('/x/.exec("x").input', '"x"');
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Object.defineProperty(Object.prototype, "input", { set: function(){} });
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shouldBe('/x/.exec("x").input', '"x"');
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