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wasm.go
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wasm.go
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//go:build js && wasm
package main
import (
"math/rand"
"syscall/js"
"time"
"github.com/nanmu42/bluelox/version"
)
var Promise = js.Global().Get("Promise")
func init() {
rand.Seed(time.Now().Unix())
}
func main() {
version.SetSubName("wasm")
runner := &Runner{}
js.Global().Set("loxrun", asyncFuncOf(runner.Run))
js.Global().Set("loxfmt", asyncFuncOf(runner.Fmt))
js.Global().Set("loxstop", asyncFuncOf(runner.Stop))
js.Global().Set("loxversion", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
return version.FullNameWithBuildDate
}))
select {}
}
// asyncFuncOf avoids Go's js deadlock
//
// source: https://github.com/golang/go/issues/41310#issuecomment-725809881
func asyncFuncOf(fn func(this js.Value, args []js.Value) error) js.Func {
return js.FuncOf(func(this js.Value, args []js.Value) interface{} {
handler := js.FuncOf(func(_ js.Value, promise []js.Value) interface{} {
resolve := promise[0]
reject := promise[1]
go func() {
err := fn(this, args)
if err != nil {
reject.Invoke(err.Error())
return
}
resolve.Invoke()
}()
return nil
})
return Promise.New(handler)
})
}