74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
//go:build js && wasm
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package main
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import (
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"bytes"
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"context"
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"errors"
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"github.com/alecthomas/participle/v2"
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"github.com/lmika/ucl/ucl"
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"strings"
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"syscall/js"
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)
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func invokeUCLCallback(name string, args ...any) {
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if onLine := js.Global().Get("ucl").Get(name); !onLine.IsNull() {
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onLine.Invoke(args...)
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}
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}
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func initJS(ctx context.Context) {
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uclObj := make(map[string]any)
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inst := ucl.New(ucl.WithOut(&uclOut{
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lineBuffer: new(bytes.Buffer),
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writeLine: func(line string) {
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invokeUCLCallback("onOutLine", line)
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},
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}))
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uclObj["eval"] = js.FuncOf(func(this js.Value, args []js.Value) any {
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if len(args) != 2 {
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return nil
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}
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cmdLine := args[0].String()
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if strings.TrimSpace(cmdLine) == "" {
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invokeUCLCallback("onNewCommand")
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return nil
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}
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wantContinue := args[1].Bool()
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if err := ucl.EvalAndDisplay(ctx, inst, cmdLine); err != nil {
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var p participle.Error
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if errors.As(err, &p) && wantContinue {
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invokeUCLCallback("onContinue")
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return nil
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}
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invokeUCLCallback("onError", err.Error())
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}
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invokeUCLCallback("onNewCommand")
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return nil
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})
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js.Global().Set("ucl", uclObj)
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}
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type uclOut struct {
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lineBuffer *bytes.Buffer
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writeLine func(line string)
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}
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func (uo *uclOut) Write(p []byte) (n int, err error) {
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for _, b := range p {
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if b == '\n' {
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uo.writeLine(uo.lineBuffer.String())
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uo.lineBuffer.Reset()
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} else {
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uo.lineBuffer.WriteByte(b)
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}
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}
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return len(p), nil
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}
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