v8/test/mjsunit/harmony/regexp-named-captures.js

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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --harmony-regexp-named-captures --allow-natives-syntax
// Malformed named captures.
assertThrows("/(?<>a)/u", SyntaxError); // Empty name.
assertThrows("/(?<aa)/u", SyntaxError); // Unterminated name.
assertThrows("/(?<42a>a)/u", SyntaxError); // Name starting with digits.
assertThrows("/(?<:a>a)/u", SyntaxError); // Name starting with invalid char.
assertThrows("/(?<a:>a)/u", SyntaxError); // Name containing with invalid char.
assertThrows("/(?<a>a)(?<a>a)/u", SyntaxError); // Duplicate name.
assertThrows("/(?<a>a)(?<b>b)(?<a>a)/u", SyntaxError); // Duplicate name.
assertThrows("/\\k<a>/u", SyntaxError); // Invalid reference.
assertThrows("/\\k<a/u", SyntaxError); // Unterminated reference.
assertThrows("/\\k/u", SyntaxError); // Lone \k.
assertThrows("/(?<a>.)\\k/u", SyntaxError); // Lone \k.
assertThrows("/(?<a>.)\\k<a/u", SyntaxError); // Unterminated reference.
assertThrows("/(?<a>.)\\k<b>/u", SyntaxError); // Invalid reference.
assertThrows("/(?<a>a)\\k<ab>/u", SyntaxError); // Invalid reference.
assertThrows("/(?<ab>a)\\k<a>/u", SyntaxError); // Invalid reference.
assertThrows("/\\k<a>(?<ab>a)/u", SyntaxError); // Invalid reference.
assertThrows("/(?<a>\\a)/u", SyntaxError); // Identity escape in capture.
// Behavior in non-unicode mode.
assertThrows("/(?<>a)/", SyntaxError);
assertThrows("/(?<aa)/", SyntaxError);
assertThrows("/(?<42a>a)/", SyntaxError);
assertThrows("/(?<:a>a)/", SyntaxError);
assertThrows("/(?<a:>a)/", SyntaxError);
assertThrows("/(?<a>a)(?<a>a)/", SyntaxError);
assertThrows("/(?<a>a)(?<b>b)(?<a>a)/", SyntaxError);
assertTrue(/\k<a>/.test("k<a>"));
assertTrue(/\k<4>/.test("k<4>"));
assertTrue(/\k<a/.test("k<a"));
assertTrue(/\k/.test("k"));
assertThrows("/(?<a>.)\\k/", SyntaxError);
assertThrows("/(?<a>.)\\k<a/", SyntaxError);
assertThrows("/(?<a>.)\\k<b>/", SyntaxError);
assertThrows("/(?<a>a)\\k<ab>/", SyntaxError);
assertThrows("/(?<ab>a)\\k<a>/", SyntaxError);
assertThrows("/\\k<a>(?<ab>a)/", SyntaxError);
assertThrows("/\\k<a(?<a>a)/", SyntaxError);
assertTrue(/(?<a>\a)/.test("a"));
assertEquals(["k<a>"], "xxxk<a>xxx".match(/\k<a>/));
assertEquals(["k<a"], "xxxk<a>xxx".match(/\k<a/));
assertEquals({a: "a", b: "b", c: "c"},
/(?<a>.)(?<b>.)(?<c>.)\k<c>\k<b>\k<a>/.exec("abccba").groups);
// A couple of corner cases around '\k' as named back-references vs. identity
// escapes.
assertTrue(/\k<a>(?<=>)a/.test("k<a>a"));
assertTrue(/\k<a>(?<!a)a/.test("k<a>a"));
assertTrue(/\k<a>(<a>x)/.test("k<a><a>x"));
assertTrue(/\k<a>(?<a>x)/.test("x"));
assertThrows("/\\k<a>(?<b>x)/", SyntaxError);
assertThrows("/\\k<a(?<a>.)/", SyntaxError);
assertThrows("/\\k(?<a>.)/", SyntaxError);
// Basic named groups.
assertEquals(["a", "a"], "bab".match(/(?<a>a)/u));
assertEquals(["a", "a"], "bab".match(/(?<a42>a)/u));
assertEquals(["a", "a"], "bab".match(/(?<_>a)/u));
assertEquals(["a", "a"], "bab".match(/(?<$>a)/u));
assertEquals(["bab", "a"], "bab".match(/.(?<$>a)./u));
assertEquals(["bab", "a", "b"], "bab".match(/.(?<a>a)(.)/u));
assertEquals(["bab", "a", "b"], "bab".match(/.(?<a>a)(?<b>.)/u));
assertEquals(["bab", "ab"], "bab".match(/.(?<a>\w\w)/u));
assertEquals(["bab", "bab"], "bab".match(/(?<a>\w\w\w)/u));
assertEquals(["bab", "ba", "b"], "bab".match(/(?<a>\w\w)(?<b>\w)/u));
assertEquals(["a", "a"], "bab".match(/(?<a>a)/));
assertEquals(["a", "a"], "bab".match(/(?<a42>a)/));
assertEquals(["a", "a"], "bab".match(/(?<_>a)/));
assertEquals(["a", "a"], "bab".match(/(?<$>a)/));
assertEquals(["bab", "a"], "bab".match(/.(?<$>a)./));
assertEquals(["bab", "a", "b"], "bab".match(/.(?<a>a)(.)/));
assertEquals(["bab", "a", "b"], "bab".match(/.(?<a>a)(?<b>.)/));
assertEquals(["bab", "ab"], "bab".match(/.(?<a>\w\w)/));
assertEquals(["bab", "bab"], "bab".match(/(?<a>\w\w\w)/));
assertEquals(["bab", "ba", "b"], "bab".match(/(?<a>\w\w)(?<b>\w)/));
assertEquals("bab".match(/(a)/u), "bab".match(/(?<a>a)/u));
assertEquals("bab".match(/(a)/u), "bab".match(/(?<a42>a)/u));
assertEquals("bab".match(/(a)/u), "bab".match(/(?<_>a)/u));
assertEquals("bab".match(/(a)/u), "bab".match(/(?<$>a)/u));
assertEquals("bab".match(/.(a)./u), "bab".match(/.(?<$>a)./u));
assertEquals("bab".match(/.(a)(.)/u), "bab".match(/.(?<a>a)(.)/u));
assertEquals("bab".match(/.(a)(.)/u), "bab".match(/.(?<a>a)(?<b>.)/u));
assertEquals("bab".match(/.(\w\w)/u), "bab".match(/.(?<a>\w\w)/u));
assertEquals("bab".match(/(\w\w\w)/u), "bab".match(/(?<a>\w\w\w)/u));
assertEquals("bab".match(/(\w\w)(\w)/u), "bab".match(/(?<a>\w\w)(?<b>\w)/u));
assertEquals(["bab", "b"], "bab".match(/(?<b>b).\1/u));
assertEquals(["baba", "b", "a"], "baba".match(/(.)(?<a>a)\1\2/u));
assertEquals(["baba", "b", "a", "b", "a"],
"baba".match(/(.)(?<a>a)(?<b>\1)(\2)/u));
assertEquals(["<a", "<"], "<a".match(/(?<lt><)a/u));
assertEquals([">a", ">"], ">a".match(/(?<gt>>)a/u));
// Named references.
assertEquals(["bab", "b"], "bab".match(/(?<b>.).\k<b>/u));
assertNull("baa".match(/(?<b>.).\k<b>/u));
// Nested groups.
assertEquals(["bab", "bab", "ab", "b"], "bab".match(/(?<a>.(?<b>.(?<c>.)))/u));
assertEquals({a: "bab", b: "ab", c: "b"},
"bab".match(/(?<a>.(?<b>.(?<c>.)))/u).groups);
// Reference inside group.
assertEquals(["bab", "b"], "bab".match(/(?<a>\k<a>\w)../u));
assertEquals({a: "b"}, "bab".match(/(?<a>\k<a>\w)../u).groups);
// Reference before group.
assertEquals(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/u));
assertEquals({a: "b"}, "bab".match(/\k<a>(?<a>b)\w\k<a>/u).groups);
assertEquals(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/u));
assertEquals({a: "a", b: "b"},
"bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/u).groups);
assertEquals(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/));
assertEquals(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/));
// Reference properties.
assertEquals("a", /(?<a>a)(?<b>b)\k<a>/u.exec("aba").groups.a);
assertEquals("b", /(?<a>a)(?<b>b)\k<a>/u.exec("aba").groups.b);
assertEquals(undefined, /(?<a>a)(?<b>b)\k<a>/u.exec("aba").groups.c);
assertEquals(undefined, /(?<a>a)(?<b>b)\k<a>|(?<c>c)/u.exec("aba").groups.c);
// Unicode names.
assertEquals("a", /(?<π>a)/u.exec("bab").groups.π);
assertEquals("a", /(?<\u{03C0}>a)/u.exec("bab").groups.π);
assertEquals("a", /(?<π>a)/u.exec("bab").groups.\u03C0);
assertEquals("a", /(?<\u{03C0}>a)/u.exec("bab").groups.\u03C0);
assertEquals("a", /(?<$>a)/u.exec("bab").groups.$);
assertEquals("a", /(?<_>a)/u.exec("bab").groups._);
assertEquals("a", /(?<$𐒤>a)/u.exec("bab").groups.$𐒤);
assertEquals("a", /(?<_\u200C>a)/u.exec("bab").groups._\u200C);
assertEquals("a", /(?<_\u200D>a)/u.exec("bab").groups._\u200D);
assertEquals("a", /(?<ಠ_ಠ>a)/u.exec("bab").groups._ಠ);
assertThrows('/(?<❤>a)/u', SyntaxError);
assertThrows('/(?<𐒤>a)/u', SyntaxError); // ID_Continue but not ID_Start.
assertEquals("a", /(?<π>a)/.exec("bab").groups.π);
assertEquals("a", /(?<$>a)/.exec("bab").groups.$);
assertEquals("a", /(?<_>a)/.exec("bab").groups._);
assertThrows("/(?<$𐒤>a)/", SyntaxError);
assertEquals("a", /(?<ಠ_ಠ>a)/.exec("bab").groups._ಠ);
assertThrows('/(?<❤>a)/', SyntaxError);
assertThrows('/(?<𐒤>a)/', SyntaxError); // ID_Continue but not ID_Start.
// Interaction with lookbehind assertions.
assertEquals(["f", "c"], "abcdef".match(/(?<=(?<a>\w){3})f/u));
assertEquals({a: "c"}, "abcdef".match(/(?<=(?<a>\w){3})f/u).groups);
assertEquals({a: "b"}, "abcdef".match(/(?<=(?<a>\w){4})f/u).groups);
assertEquals({a: "a"}, "abcdef".match(/(?<=(?<a>\w)+)f/u).groups);
assertNull("abcdef".match(/(?<=(?<a>\w){6})f/u));
assertEquals(["f", ""], "abcdef".match(/((?<=\w{3}))f/u));
assertEquals(["f", ""], "abcdef".match(/(?<a>(?<=\w{3}))f/u));
assertEquals(["f", undefined], "abcdef".match(/(?<!(?<a>\d){3})f/u));
assertNull("abcdef".match(/(?<!(?<a>\D){3})f/u));
assertEquals(["f", undefined], "abcdef".match(/(?<!(?<a>\D){3})f|f/u));
assertEquals(["f", undefined], "abcdef".match(/(?<a>(?<!\D{3}))f|f/u));
// Properties created on result.groups.
assertEquals(["fst", "snd"],
Object.getOwnPropertyNames(
/(?<fst>.)|(?<snd>.)/u.exec("abcd").groups));
// The '__proto__' property on the groups object.
assertEquals(undefined, /(?<a>.)/u.exec("a").groups.__proto__);
assertEquals("a", /(?<__proto__>a)/u.exec("a").groups.__proto__);
// Backslash as ID_Start and ID_Continue (v8:5868).
assertThrows("/(?<\\>.)/", SyntaxError); // '\' misclassified as ID_Start.
assertThrows("/(?<a\\>.)/", SyntaxError); // '\' misclassified as ID_Continue.
// Backreference before the group (exercises the capture mini-parser).
assertThrows("/\\1(?:.)/u", SyntaxError);
assertThrows("/\\1(?<=a)./u", SyntaxError);
assertThrows("/\\1(?<!a)./u", SyntaxError);
assertEquals(["a", "a"], /\1(?<a>.)/u.exec("abcd"));
// Unicode escapes in capture names.
assertTrue(/(?<a\uD801\uDCA4>.)/u.test("a")); // \u Lead \u Trail
assertThrows("/(?<a\\uD801>.)/u", SyntaxError); // \u Lead
assertThrows("/(?<a\\uDCA4>.)/u", SyntaxError); // \u Trail
assertTrue(/(?<\u0041>.)/u.test("a")); // \u NonSurrogate
assertTrue(/(?<\u{0041}>.)/u.test("a")); // \u{ Non-surrogate }
assertTrue(/(?<a\u{104A4}>.)/u.test("a")); // \u{ Surrogate, ID_Continue }
assertThrows("/(?<a\\u{110000}>.)/u", SyntaxError); // \u{ Out-of-bounds }
assertThrows("/(?<a\\uD801>.)/u", SyntaxError); // Lead
assertThrows("/(?<a\\uDCA4>.)/u", SyntaxError); // Trail
assertThrows("/(?<a\uD801>.)/u", SyntaxError); // Lead
assertThrows("/(?<a\uDCA4>.)/u", SyntaxError); // Trail
assertTrue(RegExp("(?<\\u{0041}>.)", "u").test("a")); // Non-surrogate
assertTrue(RegExp("(?<a\\u{104A4}>.)", "u").test("a")); // Surrogate,ID_Continue
assertTrue(RegExp("(?<\u{0041}>.)", "u").test("a")); // Non-surrogate
assertTrue(RegExp("(?<a\u{104A4}>.)", "u").test("a")); // Surrogate,ID_Continue
assertTrue(RegExp("(?<\\u0041>.)", "u").test("a")); // Non-surrogate
assertThrows("/(?<a\\uD801\uDCA4>.)/", SyntaxError);
assertThrows("/(?<a\\uD801>.)/", SyntaxError);
assertThrows("/(?<a\\uDCA4>.)/", SyntaxError);
assertTrue(/(?<\u0041>.)/.test("a"));
assertThrows("/(?<\\u{0041}>.)/", SyntaxError);
assertThrows("/(?<a\\u{104A4}>.)/", SyntaxError);
assertThrows("/(?<a\\u{10FFFF}>.)/", SyntaxError);
assertThrows("/(?<a\\uD801>.)/", SyntaxError); // Lead
assertThrows("/(?<a\\uDCA4>.)/", SyntaxError); // Trail;
assertThrows("/(?<a\uD801>.)/", SyntaxError); // Lead
assertThrows("/(?<a\uDCA4>.)/", SyntaxError); // Trail
assertThrows("/(?<\\u{0041}>.)/", SyntaxError); // Non-surrogate
assertThrows("/(?<a\\u{104A4}>.)/", SyntaxError); // Surrogate, ID_Continue
assertTrue(RegExp("(?<\u{0041}>.)").test("a")); // Non-surrogate
assertThrows("(?<a\u{104A4}>.)", SyntaxError); // Surrogate, ID_Continue
assertTrue(RegExp("(?<\\u0041>.)").test("a")); // Non-surrogate
// @@replace with a callable replacement argument (no named captures).
{
let result = "abcd".replace(/(.)(.)/u, (match, fst, snd, offset, str) => {
assertEquals("ab", match);
assertEquals("a", fst);
assertEquals("b", snd);
assertEquals(0, offset);
assertEquals("abcd", str);
return `${snd}${fst}`;
});
assertEquals("bacd", result);
assertEquals("undefinedbcd", "abcd".replace(/(.)|(.)/u,
(match, fst, snd, offset, str) => snd));
}
// @@replace with a callable replacement argument (global, named captures).
{
let i = 0;
let result = "abcd".replace(/(?<fst>.)(?<snd>.)/gu,
(match, fst, snd, offset, str, groups) => {
if (i == 0) {
assertEquals("ab", match);
assertEquals("a", groups.fst);
assertEquals("b", groups.snd);
assertEquals("a", fst);
assertEquals("b", snd);
assertEquals(0, offset);
assertEquals("abcd", str);
} else if (i == 1) {
assertEquals("cd", match);
assertEquals("c", groups.fst);
assertEquals("d", groups.snd);
assertEquals("c", fst);
assertEquals("d", snd);
assertEquals(2, offset);
assertEquals("abcd", str);
} else {
assertUnreachable();
}
i++;
return `${groups.snd}${groups.fst}`;
});
assertEquals("badc", result);
assertEquals("undefinedundefinedundefinedundefined",
"abcd".replace(/(?<fst>.)|(?<snd>.)/gu,
(match, fst, snd, offset, str, groups) => groups.snd));
}
// @@replace with a callable replacement argument (non-global, named captures).
{
let result = "abcd".replace(/(?<fst>.)(?<snd>.)/u,
(match, fst, snd, offset, str, groups) => {
assertEquals("ab", match);
assertEquals("a", groups.fst);
assertEquals("b", groups.snd);
assertEquals("a", fst);
assertEquals("b", snd);
assertEquals(0, offset);
assertEquals("abcd", str);
return `${groups.snd}${groups.fst}`;
});
assertEquals("bacd", result);
assertEquals("undefinedbcd",
"abcd".replace(/(?<fst>.)|(?<snd>.)/u,
(match, fst, snd, offset, str, groups) => groups.snd));
}
function toSlowMode(re) {
re.exec = (str) => RegExp.prototype.exec.call(re, str);
return re;
}
// @@replace with a callable replacement argument (slow, global,
// named captures).
{
let i = 0;
let re = toSlowMode(/(?<fst>.)(?<snd>.)/gu);
let result = "abcd".replace(re, (match, fst, snd, offset, str, groups) => {
if (i == 0) {
assertEquals("ab", match);
assertEquals("a", groups.fst);
assertEquals("b", groups.snd);
assertEquals("a", fst);
assertEquals("b", snd);
assertEquals(0, offset);
assertEquals("abcd", str);
} else if (i == 1) {
assertEquals("cd", match);
assertEquals("c", groups.fst);
assertEquals("d", groups.snd);
assertEquals("c", fst);
assertEquals("d", snd);
assertEquals(2, offset);
assertEquals("abcd", str);
} else {
assertUnreachable();
}
i++;
return `${groups.snd}${groups.fst}`;
});
assertEquals("badc", result);
assertEquals("undefinedundefinedundefinedundefined",
"abcd".replace(toSlowMode(/(?<fst>.)|(?<snd>.)/gu),
(match, fst, snd, offset, str, groups) => groups.snd));
}
// @@replace with a callable replacement argument (slow, non-global,
// named captures).
{
let re = toSlowMode(/(?<fst>.)(?<snd>.)/u);
let result = "abcd".replace(re, (match, fst, snd, offset, str, groups) => {
assertEquals("ab", match);
assertEquals("a", groups.fst);
assertEquals("b", groups.snd);
assertEquals("a", fst);
assertEquals("b", snd);
assertEquals(0, offset);
assertEquals("abcd", str);
return `${groups.snd}${groups.fst}`;
});
assertEquals("bacd", result);
assertEquals("undefinedbcd",
"abcd".replace(toSlowMode(/(?<fst>.)|(?<snd>.)/u),
(match, fst, snd, offset, str, groups) => groups.snd));
}
// @@replace with a string replacement argument (no named captures).
{
let re = /(.)(.)|(x)/u;
assertEquals("$<snd>$<fst>cd", "abcd".replace(re, "$<snd>$<fst>"));
assertEquals("bacd", "abcd".replace(re, "$2$1"));
assertEquals("cd", "abcd".replace(re, "$3"));
assertEquals("$<sndcd", "abcd".replace(re, "$<snd"));
assertEquals("$<sndacd", "abcd".replace(re, "$<snd$1"));
assertEquals("$<42a>cd", "abcd".replace(re, "$<42$1>"));
assertEquals("$<fth>cd", "abcd".replace(re, "$<fth>"));
assertEquals("$<a>cd", "abcd".replace(re, "$<$1>"));
}
// @@replace with a string replacement argument (global, named captures).
{
let re = /(?<fst>.)(?<snd>.)|(?<thd>x)/gu;
assertEquals("badc", "abcd".replace(re, "$<snd>$<fst>"));
assertEquals("badc", "abcd".replace(re, "$2$1"));
assertEquals("", "abcd".replace(re, "$<thd>"));
assertEquals("$<snd$<snd", "abcd".replace(re, "$<snd"));
assertEquals("$<snda$<sndc", "abcd".replace(re, "$<snd$1"));
assertEquals("", "abcd".replace(re, "$<42$1>"));
assertEquals("", "abcd".replace(re, "$<fth>"));
assertEquals("", "abcd".replace(re, "$<$1>"));
}
// @@replace with a string replacement argument (non-global, named captures).
{
let re = /(?<fst>.)(?<snd>.)|(?<thd>x)/u;
assertEquals("bacd", "abcd".replace(re, "$<snd>$<fst>"));
assertEquals("bacd", "abcd".replace(re, "$2$1"));
assertEquals("cd", "abcd".replace(re, "$<thd>"));
assertEquals("$<sndcd", "abcd".replace(re, "$<snd"));
assertEquals("$<sndacd", "abcd".replace(re, "$<snd$1"));
assertEquals("cd", "abcd".replace(re, "$<42$1>"));
assertEquals("cd", "abcd".replace(re, "$<fth>"));
assertEquals("cd", "abcd".replace(re, "$<$1>"));
}
// @@replace with a string replacement argument (slow, global, named captures).
{
let re = toSlowMode(/(?<fst>.)(?<snd>.)|(?<thd>x)/gu);
assertEquals("badc", "abcd".replace(re, "$<snd>$<fst>"));
assertEquals("badc", "abcd".replace(re, "$2$1"));
assertEquals("", "abcd".replace(re, "$<thd>"));
assertEquals("$<snd$<snd", "abcd".replace(re, "$<snd"));
assertEquals("$<snda$<sndc", "abcd".replace(re, "$<snd$1"));
assertEquals("", "abcd".replace(re, "$<42$1>"));
assertEquals("", "abcd".replace(re, "$<fth>"));
assertEquals("", "abcd".replace(re, "$<$1>"));
}
// @@replace with a string replacement argument (slow, non-global,
// named captures).
{
let re = toSlowMode(/(?<fst>.)(?<snd>.)|(?<thd>x)/u);
assertEquals("bacd", "abcd".replace(re, "$<snd>$<fst>"));
assertEquals("bacd", "abcd".replace(re, "$2$1"));
assertEquals("cd", "abcd".replace(re, "$<thd>"));
assertEquals("$<sndcd", "abcd".replace(re, "$<snd"));
assertEquals("$<sndacd", "abcd".replace(re, "$<snd$1"));
assertEquals("cd", "abcd".replace(re, "$<42$1>"));
assertEquals("cd", "abcd".replace(re, "$<fth>"));
assertEquals("cd", "abcd".replace(re, "$<$1>"));
}
// Tests for 'groups' semantics on the regexp result object.
// https://crbug.com/v8/7192
{
const re = /./;
const result = re.exec("a");
assertTrue(%ArraySpeciesProtector());
assertEquals(result.__proto__, Array.prototype);
assertTrue(result.hasOwnProperty('groups'));
assertArrayEquals(["a"], result);
assertEquals(0, result.index);
assertEquals(undefined, result.groups);
Array.prototype.groups = { a: "b" };
assertTrue(%ArraySpeciesProtector());
assertEquals("$<a>", "a".replace(re, "$<a>"));
Array.prototype.groups = undefined;
}
{
const re = toSlowMode(/./);
const result = re.exec("a");
assertTrue(%ArraySpeciesProtector());
assertEquals(result.__proto__, Array.prototype);
assertTrue(result.hasOwnProperty('groups'));
assertArrayEquals(["a"], result);
assertEquals(0, result.index);
assertEquals(undefined, result.groups);
Array.prototype.groups = { a: "b" };
assertTrue(%ArraySpeciesProtector());
assertEquals("$<a>", "a".replace(re, "$<a>"));
Array.prototype.groups = undefined;
}
{
const re = /(?<a>a).|(?<x>x)/;
const result = re.exec("ab");
assertTrue(%ArraySpeciesProtector());
assertEquals(result.__proto__, Array.prototype);
assertTrue(result.hasOwnProperty('groups'));
assertArrayEquals(["ab", "a", undefined], result);
assertEquals(0, result.index);
assertEquals({a: "a", x: undefined}, result.groups);
// a is a matched named capture, b is an unmatched named capture, and z
// is not a named capture.
Array.prototype.groups = { a: "b", x: "y", z: "z" };
assertTrue(%ArraySpeciesProtector());
assertEquals("a", "ab".replace(re, "$<a>"));
assertEquals("", "ab".replace(re, "$<x>"));
assertEquals("", "ab".replace(re, "$<z>"));
Array.prototype.groups = undefined;
}
{
const re = toSlowMode(/(?<a>a).|(?<x>x)/);
const result = re.exec("ab");
assertTrue(%ArraySpeciesProtector());
assertEquals(result.__proto__, Array.prototype);
assertTrue(result.hasOwnProperty('groups'));
assertArrayEquals(["ab", "a", undefined], result);
assertEquals(0, result.index);
assertEquals({a: "a", x: undefined}, result.groups);
// a is a matched named capture, b is an unmatched named capture, and z
// is not a named capture.
Array.prototype.groups = { a: "b", x: "y", z: "z" };
assertTrue(%ArraySpeciesProtector());
assertEquals("a", "ab".replace(re, "$<a>"));
assertEquals("", "ab".replace(re, "$<x>"));
assertEquals("", "ab".replace(re, "$<z>"));
Array.prototype.groups = undefined;
}
{
class FakeRegExp extends RegExp {
exec(subject) {
const fake_result = [ "ab", "a" ];
fake_result.index = 0;
// groups is not set, triggering prototype lookup.
return fake_result;
}
};
const re = new FakeRegExp();
const result = re.exec("ab");
assertTrue(%ArraySpeciesProtector());
assertEquals(result.__proto__, Array.prototype);
assertFalse(result.hasOwnProperty('groups'));
Array.prototype.groups = { a: "b" };
Array.prototype.groups.__proto__.b = "c";
assertTrue(%ArraySpeciesProtector());
assertEquals("b", "ab".replace(re, "$<a>"));
assertEquals("c", "ab".replace(re, "$<b>"));
Array.prototype.groups = undefined;
}
{
class FakeRegExp extends RegExp {
exec(subject) {
const fake_result = [ "ab", "a" ];
fake_result.index = 0;
fake_result.groups = { a: "b" };
fake_result.groups.__proto__.b = "c";
return fake_result;
}
};
const re = new FakeRegExp();
const result = re.exec("ab");
assertTrue(%ArraySpeciesProtector());
assertEquals(result.__proto__, Array.prototype);
assertTrue(result.hasOwnProperty('groups'));
assertEquals({ a: "b" }, result.groups);
assertEquals("b", "ab".replace(re, "$<a>"));
assertEquals("c", "ab".replace(re, "$<b>"));
}