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