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LibJS: Implement RegExp constructor according to the spec

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This allows passing an existing RegExp object (or an object that is
sufficiently like a RegExp object) as the "pattern" argument of the
RegExp constructor.
This commit is contained in:
Timothy Flynn 2021-07-08 13:36:09 -04:00 • committed by Linus Groh
parent 2686c5f503
commit 3892b6e6ec
2 changed files with 80 additions and 2 deletions
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23
Userland/Libraries/LibJS/Tests/builtins/RegExp/RegExp.js
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@ -29,3 +29,26 @@ test("basic functionality", () => {
expect(RegExp("foo", "g").toString()).toBe("/foo/g");
expect(RegExp(undefined, "g").toString()).toBe("/(?:)/g");
});
test("regexp object as pattern parameter", () => {
expect(RegExp(/foo/).toString()).toBe("/foo/");
expect(RegExp(/foo/g).toString()).toBe("/foo/g");
expect(RegExp(/foo/g, "").toString()).toBe("/foo/");
expect(RegExp(/foo/g, "y").toString()).toBe("/foo/y");
var regex_like_object_without_flags = {
source: "foo",
[Symbol.match]: function () {},
};
expect(RegExp(regex_like_object_without_flags).toString()).toBe("/foo/");
expect(RegExp(regex_like_object_without_flags, "y").toString()).toBe("/foo/y");
var regex_like_object_with_flags = {
source: "foo",
flags: "g",
[Symbol.match]: function () {},
};
expect(RegExp(regex_like_object_with_flags).toString()).toBe("/foo/g");
expect(RegExp(regex_like_object_with_flags, "").toString()).toBe("/foo/");
expect(RegExp(regex_like_object_with_flags, "y").toString()).toBe("/foo/y");
});