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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
description: lastIndex is read and reset to 0 when global is set and the match
fails.
es6id: 21.2.5.2.2
info: |
21.2.5.2.2 Runtime Semantics: RegExpBuiltinExec ( R, S )
[...]
4. Let flags be R.[[OriginalFlags]].
5. If flags contains "g", let global be true, else let global be false.
[...]
7. If global is false and sticky is false, let lastIndex be 0.
8. Else, let lastIndex be ? ToLength(? Get(R, "lastIndex")).
[...]
12. Repeat, while matchSucceeded is false
[...]
c. If r is failure, then
i. If sticky is true, then
1. Perform ? Set(R, "lastIndex", 0, true).
2. Return null.
ii. Let lastIndex be AdvanceStringIndex(S, lastIndex, fullUnicode).
---*/
var lastIndexReads;
var result;
var r = /a/g;
function reset(value) {
r.lastIndex = {
valueOf: function() {
lastIndexReads++;
return value;
}
};
lastIndexReads = 0;
}
reset(42); // lastIndex beyond end of string.
result = r.exec('abc');
assert.sameValue(result, null);
assert.sameValue(r.lastIndex, 0);
assert.sameValue(lastIndexReads, 1);
reset(-1); // No match.
result = r.exec('nbc');
assert.sameValue(result, null);
assert.sameValue(r.lastIndex, 0);
assert.sameValue(lastIndexReads, 1);
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