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Improve TextDecoder.decode

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1 - Optional input (why? I don't know, but it's part of the spec and happens)
2 - Optional stream parameter
3 - More test cases
This commit is contained in:
Karl Seguin
2025-09-12 12:31:28 +08:00
parent 6d3065c4c6
commit 0913abe806
2 changed files with 56 additions and 7 deletions
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30
src/tests/encoding/decoder.html
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@@ -1,3 +1,6 @@
<!DOCTYPE html>
<meta charset="UTF-8">
<script src="../testing.js"></script>
<script id=decoder>
let d1 = new TextDecoder();
@@ -5,13 +8,40 @@
testing.expectEqual(false, d1.fatal);
testing.expectEqual(false, d1.ignoreBOM);
testing.expectEqual('', d1.decode());
testing.expectEqual('𠮷', d1.decode(new Uint8Array([240, 160, 174, 183])));
testing.expectEqual('𠮷', d1.decode(new Uint8Array([0xEF, 0xBB, 0xBF, 240, 160, 174, 183])));
testing.expectEqual('<27>2', d1.decode(new Uint8Array([249, 50])));
{
const buffer = new ArrayBuffer(4);
const ints = new Uint8Array(buffer)
ints[0] = 240;
ints[1] = 160;
ints[2] = 174;
ints[3] = 183;
testing.expectEqual('𠮷', d1.decode(buffer));
}
{
const buffer = new ArrayBuffer(4);
const dv = new DataView(buffer);
dv.setUint8(0, 240);
dv.setUint8(1, 160);
dv.setUint8(2, 174);
dv.setUint8(3, 183);
testing.expectEqual('𠮷', d1.decode(dv));
}
let d2 = new TextDecoder('utf8', {fatal: true})
testing.expectError('Error: InvalidUtf8', () => {
let data = new Uint8Array([240, 240, 160, 174, 183]);
d2.decode(data);
});
</script>
<script id=stream>
let d3 = new TextDecoder();
testing.expectEqual('', d2.decode(new Uint8Array([226, 153]), { stream: true }));
testing.expectEqual('♥', d2.decode(new Uint8Array([165]), { stream: true }));
</script>