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The new function js.TypedArrayOf returns a JavaScript typed array for a given slice. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays This change also changes js.ValueOf to not accept a []byte any more. Fixes #25532. Change-Id: I8c7bc98ca4e21c3514d19eee7a1f92388d74ab2a Reviewed-on: https://go-review.googlesource.com/121215 Run-TryBot: Brad Fitzpatrick <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Brad Fitzpatrick <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| // Copyright 2018 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
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| // +build js,wasm | ||
|
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| package js | ||
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|
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| import ( | ||
| "sync" | ||
| "unsafe" | ||
| ) | ||
|
|
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| var ( | ||
| int8Array = Global().Get("Int8Array") | ||
| int16Array = Global().Get("Int16Array") | ||
| int32Array = Global().Get("Int32Array") | ||
| uint8Array = Global().Get("Uint8Array") | ||
| uint16Array = Global().Get("Uint16Array") | ||
| uint32Array = Global().Get("Uint32Array") | ||
| float32Array = Global().Get("Float32Array") | ||
| float64Array = Global().Get("Float64Array") | ||
| ) | ||
|
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| // TypedArray represents a JavaScript typed array. | ||
| type TypedArray struct { | ||
| Value | ||
| } | ||
|
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| // Release frees up resources allocated for the typed array. | ||
| // The typed array and its buffer must not be accessed after calling Release. | ||
| func (a TypedArray) Release() { | ||
| openTypedArraysMutex.Lock() | ||
| delete(openTypedArrays, a) | ||
| openTypedArraysMutex.Unlock() | ||
| } | ||
|
|
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| var ( | ||
| openTypedArraysMutex sync.Mutex | ||
| openTypedArrays = make(map[TypedArray]interface{}) | ||
| ) | ||
|
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| // TypedArrayOf returns a JavaScript typed array backed by the slice's underlying array. | ||
| // It can be passed to functions of this package that accept interface{}, for example Value.Set and Value.Call. | ||
| // | ||
| // The supported types are []int8, []int16, []int32, []uint8, []uint16, []uint32, []float32 and []float64. | ||
| // Passing an unsupported value causes a panic. | ||
| // | ||
| // TypedArray.Release must be called to free up resources when the typed array will not be used any more. | ||
| func TypedArrayOf(slice interface{}) TypedArray { | ||
| a := TypedArray{typedArrayOf(slice)} | ||
| openTypedArraysMutex.Lock() | ||
| openTypedArrays[a] = slice | ||
| openTypedArraysMutex.Unlock() | ||
| return a | ||
| } | ||
|
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| func typedArrayOf(slice interface{}) Value { | ||
| switch slice := slice.(type) { | ||
| case []int8: | ||
| if len(slice) == 0 { | ||
| return int8Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return int8Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []int16: | ||
| if len(slice) == 0 { | ||
| return int16Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return int16Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []int32: | ||
| if len(slice) == 0 { | ||
| return int32Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return int32Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []uint8: | ||
| if len(slice) == 0 { | ||
| return uint8Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return uint8Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []uint16: | ||
| if len(slice) == 0 { | ||
| return uint16Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return uint16Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []uint32: | ||
| if len(slice) == 0 { | ||
| return uint32Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return uint32Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []float32: | ||
| if len(slice) == 0 { | ||
| return float32Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return float32Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| case []float64: | ||
| if len(slice) == 0 { | ||
| return float64Array.New(memory.Get("buffer"), 0, 0) | ||
| } | ||
| return float64Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice)) | ||
| default: | ||
| panic("TypedArrayOf: not a supported slice") | ||
| } | ||
| } |