Add WASM-target and a html demo page

wasm/wasm.go

@@ -0,0 +1,96 @@
+//go:build wasm && go1.23
+
+package main
+
+import (
+	"log"
+	"neemek.com/anglais/core"
+	"syscall/js"
+)
+
+func jsError(err error) interface{} {
+	errorConstructor := js.Global().Get("Error")
+	errorObject := errorConstructor.New(err.Error())
+
+	return errorObject
+}
+
+func jsErrorOfString(err string) interface{} {
+	errorConstructor := js.Global().Get("Error")
+	errorObject := errorConstructor.New(err)
+
+	return errorObject
+}
+
+func run(this js.Value, args []js.Value) interface{} {
+	source := args[0].String()
+	outputHandler := args[1]
+	doRun := args[2]
+	log.Printf("got source: %s", source)
+
+	lexer := core.NewLexer(source)
+	tokens, err := lexer.Tokenize()
+
+	if err != nil {
+		return jsError(err)
+	}
+
+	log.Printf("got tokens: %v", tokens)
+
+	parser := core.NewParser(tokens)
+
+	tree := parser.Parse()
+
+	log.Printf("Parsed tree: %s", tree.String())
+
+	if len(parser.Errors) > 0 {
+		return jsErrorOfString(parser.Errors[0].Description)
+	}
+
+	compiler := core.NewCompiler()
+
+	compiler.Compile(tree)
+
+	log.Printf("Compiled tree (into %i instructions)", len(compiler.Chunk.Bytecode))
+
+	vm := core.NewVM(compiler.Chunk, 256, 256)
+
+	// overwrite output
+	vm.SetGlobal("write", core.BuiltinFunctionValue{
+		Name:       "write",
+		Parameters: []string{"value"},
+		F: func(v map[string]core.Value) core.Value {
+			log.Printf("Writing value: %s", v["value"].String())
+			outputHandler.Invoke(js.ValueOf(v["value"].String()))
+			return nil
+		},
+	})
+	vm.SetGlobal("print", core.BuiltinFunctionValue{
+		Name:       "print",
+		Parameters: []string{"value"},
+		F: func(v map[string]core.Value) core.Value {
+			log.Printf("Printing value: %s", v["value"].String())
+			outputHandler.Invoke(js.ValueOf(v["value"].String() + "\n"))
+			return nil
+		},
+	})
+
+	for doRun.Invoke().Bool() && vm.HasNext() {
+		vm.Next()
+	}
+
+	log.Println("Finished executing")
+
+	return js.Null()
+}
+
+func main() {
+	log.Println("Initializing Anglais WASM module")
+
+	js.Global().Set("run", js.FuncOf(run))
+
+	log.Println("Initialized Anglais WASM module")
+
+	// keep alive so run func can be used
+	select {}
+}