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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.
/*---
esid: sec-%typedarray%.prototype.copywithin
description: >
Set values with negative end argument.
info: |
22.2.3.5 %TypedArray%.prototype.copyWithin (target, start [ , end ] )
%TypedArray%.prototype.copyWithin is a distinct function that implements the
same algorithm as Array.prototype.copyWithin as defined in 22.1.3.3 except
that the this object's [[ArrayLength]] internal slot is accessed in place of
performing a [[Get]] of "length" and the actual copying of values in step 12
must be performed in a manner that preserves the bit-level encoding of the
source data.
...
22.1.3.3 Array.prototype.copyWithin (target, start [ , end ] )
...
7. If end is undefined, let relativeEnd be len; else let relativeEnd be ?
ToInteger(end).
8. If relativeEnd < 0, let final be max((len + relativeEnd), 0); else let
final be min(relativeEnd, len).
...
includes: [compareArray.js, testTypedArray.js]
features: [TypedArray]
---*/
testWithTypedArrayConstructors(function(TA, N) {
assert(
compareArray(
new TA(N([0, 1, 2, 3])).copyWithin(0, 1, -1),
N([1, 2, 2, 3])
),
'[0, 1, 2, 3].copyWithin(0, 1, -1) -> [1, 2, 2, 3]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3, 4])).copyWithin(2, 0, -1),
N([0, 1, 0, 1, 2])
),
'[0, 1, 2, 3, 4].copyWithin(2, 0, -1) -> [0, 1, 0, 1, 2]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3, 4])).copyWithin(1, 2, -2),
N([0, 2, 2, 3, 4])
),
'[0, 1, 2, 3, 4].copyWithin(1, 2, -2) -> [0, 2, 2, 3, 4]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3])).copyWithin(0, -2, -1),
N([2, 1, 2, 3])
),
'[0, 1, 2, 3].copyWithin(0, -2, -1) -> [2, 1, 2, 3]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3, 4])).copyWithin(2, -2, -1),
N([0, 1, 3, 3, 4])
),
'[0, 1, 2, 3, 4].copyWithin(2, -2, 1) -> [0, 1, 3, 3, 4]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3])).copyWithin(-3, -2, -1),
N([0, 2, 2, 3])
),
'[0, 1, 2, 3].copyWithin(-3, -2, -1) -> [0, 2, 2, 3]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3, 4])).copyWithin(-2, -3, -1),
N([0, 1, 2, 2, 3])
),
'[0, 1, 2, 3, 4].copyWithin(-2, -3, -1) -> [0, 1, 2, 2, 3]'
);
assert(
compareArray(
new TA(N([0, 1, 2, 3, 4])).copyWithin(-5, -2, -1),
N([3, 1, 2, 3, 4])
),
'[0, 1, 2, 3, 4].copyWithin(-5, -2, -1) -> [3, 1, 2, 3, 4]'
);
});
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