init

Author: alixander

d2js/README.md

@@ -0,0 +1 @@
+`GOOS=js GOARCH=wasm go build -ldflags='-s -w' -trimpath -o main.wasm ./d2js`

d2js/js.go

@@ -0,0 +1,90 @@
+//go:build wasm
+
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+	"syscall/js"
+
+	"oss.terrastruct.com/d2/d2compiler"
+	"oss.terrastruct.com/d2/d2format"
+	"oss.terrastruct.com/d2/d2parser"
+	"oss.terrastruct.com/d2/lib/urlenc"
+)
+
+func main() {
+	js.Global().Set("d2Compile", js.FuncOf(jsCompile))
+	js.Global().Set("d2Encode", js.FuncOf(jsEncode))
+	js.Global().Set("d2Decode", js.FuncOf(jsDecode))
+	select {}
+}
+
+type jsObject struct {
+	Result    string `json:"result"`
+	UserError string `json:"userError"`
+	D2Error   string `json:"d2Error"`
+}
+
+// TODO error passing
+// TODO recover panics
+func jsCompile(this js.Value, args []js.Value) interface{} {
+	script := args[0].String()
+
+	g, err := d2compiler.Compile("", strings.NewReader(script), &d2compiler.CompileOptions{
+		UTF16: true,
+	})
+	var pe d2parser.ParseError
+	if err != nil {
+		if errors.As(err, &pe) {
+			serialized, _ := json.Marshal(err)
+			ret := jsObject{UserError: string(serialized)}
+			str, _ := json.Marshal(ret)
+			return string(str)
+		}
+		ret := jsObject{D2Error: err.Error()}
+		str, _ := json.Marshal(ret)
+		return string(str)
+	}
+
+	newScript := d2format.Format(g.AST)
+	if script != newScript {
+		ret := jsObject{Result: newScript}
+		str, _ := json.Marshal(ret)
+		return string(str)
+	}
+
+	return nil
+}
+
+func jsEncode(this js.Value, args []js.Value) interface{} {
+	script := args[0].String()
+
+	encoded, err := urlenc.Encode(script)
+	// should never happen
+	if err != nil {
+		ret := jsObject{D2Error: err.Error()}
+		str, _ := json.Marshal(ret)
+		return string(str)
+	}
+
+	ret := jsObject{Result: encoded}
+	str, _ := json.Marshal(ret)
+	return string(str)
+}
+
+func jsDecode(this js.Value, args []js.Value) interface{} {
+	script := args[0].String()
+
+	script, err := urlenc.Decode(script)
+	if err != nil {
+		ret := jsObject{UserError: err.Error()}
+		str, _ := json.Marshal(ret)
+		return string(str)
+	}
+
+	ret := jsObject{Result: script}
+	str, _ := json.Marshal(ret)
+	return string(str)
+}

d2renderers/d2latex/latex.go

@@ -1,3 +1,5 @@
+//go:build !wasm
+
 package d2latex
 
 import (

d2renderers/d2latex/latex_stub.go

@@ -0,0 +1,11 @@
+//go:build wasm
+
+package d2latex
+
+func Render(s string) (_ string, err error) {
+	return "", nil
+}
+
+func Measure(s string) (width, height int, err error) {
+	return
+}