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feat: add DataView & ArrayBuffer support
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lukeed committed Aug 14, 2020
1 parent 8cb217a commit 04c176b
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Showing 2 changed files with 87 additions and 3 deletions.
10 changes: 10 additions & 0 deletions src/index.js
Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,16 @@ export function klona(x) {
return tmp;
}

if (str === '[object DataView]') {
return new x.constructor( klona(x.buffer) );
}

if (str === '[object ArrayBuffer]') {
return x.slice(0);
}

// ArrayBuffer.isView(x)
// ~> `new` bcuz `Buffer.slice` => ref
if (str.slice(-6) === 'Array]') {
return new x.constructor(x);
}
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80 changes: 77 additions & 3 deletions test/index.js
Original file line number Diff line number Diff line change
Expand Up @@ -487,7 +487,8 @@ Strings.run();
// ---

const TypedArrays = suite('TypedArray');
TypedArrays('buffer', () => {

TypedArrays('Buffer', () => {
const input = Buffer.from('asd');
const output = klona(input);

Expand All @@ -504,7 +505,7 @@ TypedArrays('buffer', () => {
assert.equal(output.toString(), current);
});

TypedArrays('uint16array', () => {
TypedArrays('Int16Array', () => {
const input = new Int16Array([42]);
const output = klona(input);

Expand All @@ -517,11 +518,13 @@ TypedArrays('uint16array', () => {
assert.equal(output[0], 42);
});

TypedArrays('int32array', () => {
TypedArrays('Int32Array', () => {
const buf = new ArrayBuffer(8);
const input = new Int32Array(buf);
const output = klona(input);

assert.deepEqual(input, new Int32Array([0, 0]));
assert.deepEqual(output, new Int32Array([0, 0]));
assert.deepEqual(input, output);

output[1] = 42;
Expand All @@ -531,4 +534,75 @@ TypedArrays('int32array', () => {
assert.equal(output[0], 0);
});

TypedArrays('Int32Array', () => {
const buf = new ArrayBuffer(8);
const input = new Int32Array(buf);
const output = klona(input);

assert.deepEqual(input, new Int32Array([0, 0]));
assert.deepEqual(output, new Int32Array([0, 0]));
assert.deepEqual(input, output);

output[1] = 42;
assert.equal(input[1], 0);

input[0] = 22;
assert.equal(output[0], 0);
});

TypedArrays('ArrayBuffer :: empty', () => {
const input = new ArrayBuffer(6);
const output = klona(input);

assert.deepEqual(input, output);

const view1 = new DataView(input);
const view2 = new DataView(output);

view1.setInt8(0, 4);
assert.equal(view1.getInt8(0), 4);
assert.equal(view2.getInt8(0), 0);

view2.setInt8(1, 8);
assert.equal(view1.getInt8(1), 0);
assert.equal(view2.getInt8(1), 8);
});

TypedArrays('ArrayBuffer :: values', () => {
const input = new ArrayBuffer(3);
const view1 = new DataView(input);

view1.setInt8(0, 4);
view1.setInt8(1, 5);
view1.setInt8(2, 6);

const output = klona(input);
const view2 = new DataView(output);

assert.deepEqual(input, output);

assert.equal(view2.getInt8(0), 4);
assert.equal(view2.getInt8(1), 5);
assert.equal(view2.getInt8(2), 6);
});

TypedArrays('DataView', () => {
const ints = new Int8Array([1, 2, 3]);
const input = new DataView(ints.buffer);
const output = klona(input);

assert.deepEqual(input, output);
assert.deepEqual(input.buffer, output.buffer);

input.setInt8(1, 6);
assert.equal(ints[1], 6);
assert.equal(input.getInt8(1), 6);
assert.equal(output.getInt8(1), 2);

output.setInt8(0, 4);
assert.equal(ints[0], 1);
assert.equal(input.getInt8(0), 1);
assert.equal(output.getInt8(0), 4);
});

TypedArrays.run();

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