46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
//go:build js && wasm
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package safejs
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import (
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"syscall/js"
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"github.com/hack-pad/safejs/internal/catch"
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)
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// Func is a wrapped Go function to be called by JavaScript.
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type Func struct {
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fn js.Func
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}
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// FuncOf returns a function to be used by JavaScript. See [js.FuncOf] for details.
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func FuncOf(fn func(this Value, args []Value) any) (Func, error) {
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jsFunc, err := toJSFunc(fn)
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return Func{
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fn: jsFunc,
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}, err
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}
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func toJSFunc(fn func(this Value, args []Value) any) (js.Func, error) {
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jsFunc := func(this js.Value, args []js.Value) any {
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result := fn(Safe(this), toValues(args))
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return toJSValue(result)
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}
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return catch.Try(func() js.Func {
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return js.FuncOf(jsFunc)
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})
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}
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// Release frees up resources allocated for the function. The function must not be invoked after calling Release.
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// It is allowed to call Release while the function is still running.
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func (f Func) Release() {
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f.fn.Release()
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}
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// Value returns this Func's inner Value. For example, using value.Invoke() calls the function.
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//
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// Equivalent to accessing [js.Func]'s embedded [js.Value] field, only as a safejs type.
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func (f Func) Value() Value {
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return Safe(f.fn.Value)
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}
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