8c79beadbf
Implements match indices for regexp, as specified by https://github.com/tc39/proposal-regexp-match-indices, a stage 3 TC39 proposal. This implementation is hidden behind the '--harmony-regexp-match-indices' flag. Regexp match indices extends the JSRegExpResult object with an array of indices of matches, as well as a dictionary of capture names to match indices. Bug: v8:9548 Change-Id: Ia9efcee00d997dda6158539b8d0f4c4e5965e5e7 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1771379 Commit-Queue: Joshua Litt <joshualitt@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#63581}
106 lines
2.1 KiB
JavaScript
106 lines
2.1 KiB
JavaScript
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --harmony-regexp-match-indices
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// Sanity test.
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{
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const re = /a+(?<Z>z)?/;
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const m = re.exec("xaaaz");
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assertEquals(m.indices, [[1, 5], [4, 5]]);
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assertEquals(m.indices.groups, {'Z': [4, 5]})
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}
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// Capture groups that are not matched return `undefined`.
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{
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const re = /a+(?<Z>z)?/;
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const m = re.exec("xaaay");
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assertEquals(m.indices, [[1, 4], undefined]);
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assertEquals(m.indices.groups, {'Z': undefined});
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}
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// Two capture groups.
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{
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const re = /a+(?<A>zz)?(?<B>ii)?/;
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const m = re.exec("xaaazzii");
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assertEquals(m.indices, [[1, 8], [4, 6], [6, 8]]);
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assertEquals(m.indices.groups, {'A': [4, 6], 'B': [6, 8]});
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}
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// No capture groups.
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{
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const re = /a+/;
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const m = re.exec("xaaazzii");
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assertEquals(m.indices [[1, 4]]);
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assertEquals(m.indices.groups, undefined);
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}
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// No match.
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{
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const re = /a+/;
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const m = re.exec("xzzii");
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assertEquals(null, m);
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}
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// Unnamed capture groups.
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{
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const re = /a+(z)?/;
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const m = re.exec("xaaaz")
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assertEquals(m.indices, [[1, 5], [4, 5]]);
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assertEquals(m.indices.groups, undefined)
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}
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// Named and unnamed capture groups.
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{
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const re = /a+(z)?(?<Y>y)?/;
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const m = re.exec("xaaazyy")
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assertEquals(m.indices, [[1, 6], [4, 5], [5, 6]]);
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assertEquals(m.indices.groups, {'Y': [5, 6]})
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}
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// Verify property overwrite.
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{
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const re = /a+(?<Z>z)?/;
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const m = re.exec("xaaaz");
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m.indices = null;
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assertEquals(null, m.indices);
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}
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// Mess with array prototype, we should still do the right thing.
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{
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Object.defineProperty(Array.prototype, "groups", {
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get: () => {
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assertUnreachable();
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return null;
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},
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set: (x) => {
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assertUnreachable();
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}
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});
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Object.defineProperty(Array.prototype, "0", {
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get: () => {
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assertUnreachable();
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return null;
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},
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set: (x) => {
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assertUnreachable();
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}
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});
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const re = /a+(?<Z>z)?/;
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const m = re.exec("xaaaz");
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assertEquals(m.indices.groups, {'Z': [4, 5]})
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}
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