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37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: >
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Test the groups object on RegExp subclass results that do not have their own.
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esid: sec-regexpbuiltinexec
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features: [regexp-named-groups]
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info: |
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Runtime Semantics: RegExpBuiltinExec ( R, S )
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24. If _R_ contains any |GroupName|, then
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a. Let _groups_ be ObjectCreate(*null*).
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25. Else,
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a. Let _groups_ be *undefined*.
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26. Perform ! CreateDataProperty(_A_, `"groups"`, _groups_).
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---*/
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class FakeRegExp extends RegExp {
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exec(subject) {
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const fakeResult = ["ab", "a"];
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fakeResult.index = 0;
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// `groups` is not set, triggering prototype lookup.
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return fakeResult;
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}
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};
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const re = new FakeRegExp();
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const result = re.exec("ab");
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assert.sameValue(Object.getPrototypeOf(result), Array.prototype);
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assert.sameValue(false, result.hasOwnProperty("groups"));
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Array.prototype.groups = { a: "b" };
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Object.getPrototypeOf(Array.prototype.groups).b = "c";
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assert.sameValue("b", "ab".replace(re, "$<a>"));
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assert.sameValue("c", "ab".replace(re, "$<b>"));
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Array.prototype.groups = undefined;
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