asd

internal/builtin/convert.go

@@ -0,0 +1,204 @@
+package builtin
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/dop251/goja"
+)
+
+func convertJSValueToGo(vm *goja.Runtime, jsValue goja.Value, targetType reflect.Type) (any, error) {
+	if goja.IsNull(jsValue) {
+		if targetType.Kind() == reflect.Pointer || targetType.Kind() == reflect.Map {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("cannot convert null/undefined to %v", targetType)
+	}
+
+	if goja.IsUndefined(jsValue) {
+		if targetType.Kind() == reflect.Pointer || targetType.Kind() == reflect.Map {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("cannot convert null/undefined to %v", targetType)
+	}
+
+	switch targetType.Kind() {
+	case reflect.String:
+		return jsValue.String(), nil
+
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		n, ok := jsValue.Export().(int64)
+		if !ok {
+			return nil, fmt.Errorf("expected int, got %T", jsValue.Export())
+		}
+		return reflect.ValueOf(n).Convert(targetType).Interface(), nil
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		n, ok := jsValue.Export().(int64)
+		if !ok {
+			return nil, fmt.Errorf("expected uint, got %T", jsValue.Export())
+		}
+		return reflect.ValueOf(uint(n)).Convert(targetType).Interface(), nil
+
+	case reflect.Float32, reflect.Float64:
+		n, ok := jsValue.Export().(float64)
+		if !ok {
+			return nil, fmt.Errorf("expected float, got %T", jsValue.Export())
+		}
+		return reflect.ValueOf(n).Convert(targetType).Interface(), nil
+
+	case reflect.Bool:
+		return jsValue.ToBoolean(), nil
+
+	case reflect.Interface:
+		return jsValue.Export(), nil
+
+	case reflect.Map:
+		if goja.IsUndefined(jsValue) || goja.IsNull(jsValue) {
+			return nil, nil
+		}
+
+		if targetType.Key().Kind() == reflect.String {
+			obj := jsValue.ToObject(vm)
+			if obj == nil {
+				return nil, fmt.Errorf("not an object")
+			}
+
+			if targetType.Elem().Kind() == reflect.Interface {
+				result := make(map[string]any)
+				for _, key := range obj.Keys() {
+					result[key] = obj.Get(key).Export()
+				}
+				return result, nil
+			} else if targetType.Elem().Kind() == reflect.String {
+				result := make(map[string]string)
+				for _, key := range obj.Keys() {
+					v := obj.Get(key)
+					result[key] = v.String()
+				}
+				return result, nil
+			}
+		}
+		return nil, fmt.Errorf("unsupported map type: %v", targetType)
+
+	case reflect.Struct:
+		obj := jsValue.ToObject(vm)
+		if obj == nil {
+			return nil, fmt.Errorf("not an object")
+		}
+
+		result := reflect.New(targetType).Elem()
+		for i := 0; i < targetType.NumField(); i++ {
+			field := targetType.Field(i)
+			fieldName := getFieldName(field)
+
+			jsField := obj.Get(fieldName)
+
+			var err error
+			var converted any
+			func() {
+				defer func() {
+					if r := recover(); r != nil {
+						err = nil
+						converted = nil
+					}
+				}()
+				converted, err = convertJSValueToGo(vm, jsField, field.Type)
+			}()
+
+			if err != nil {
+				return nil, fmt.Errorf("field %s: %v", fieldName, err)
+			}
+
+			if converted == nil {
+				if field.Type.Kind() == reflect.Pointer || field.Type.Kind() == reflect.Map {
+					continue
+				}
+			} else {
+				result.Field(i).Set(reflect.ValueOf(converted))
+			}
+		}
+		return result.Interface(), nil
+
+	case reflect.Pointer:
+		if goja.IsNull(jsValue) || goja.IsUndefined(jsValue) {
+			return nil, nil
+		}
+
+		elemType := targetType.Elem()
+		converted, err := convertJSValueToGo(vm, jsValue, elemType)
+		if err != nil {
+			return nil, err
+		}
+
+		ptr := reflect.New(elemType)
+		ptr.Elem().Set(reflect.ValueOf(converted))
+		return ptr.Interface(), nil
+
+	default:
+		return nil, fmt.Errorf("unsupported type: %v", targetType)
+	}
+}
+
+func convertGoValueToJS(vm *goja.Runtime, goValue reflect.Value) goja.Value {
+	value := goValue.Interface()
+
+	switch v := value.(type) {
+	case string, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64, bool:
+		return vm.ToValue(v)
+
+	case error:
+		return vm.ToValue(v.Error())
+
+	case map[string]string:
+		obj := vm.NewObject()
+		for key, val := range v {
+			_ = obj.Set(key, val)
+		}
+		return obj
+
+	case map[string]any:
+		obj := vm.NewObject()
+		for key, val := range v {
+			_ = obj.Set(key, convertGoValueToJS(vm, reflect.ValueOf(val)))
+		}
+		return obj
+
+	case []any:
+		arr := make([]goja.Value, len(v))
+		for i, item := range v {
+			arr[i] = convertGoValueToJS(vm, reflect.ValueOf(item))
+		}
+		return vm.ToValue(arr)
+
+	default:
+		if goValue.Kind() == reflect.Pointer {
+			if goValue.IsNil() {
+				return goja.Null()
+			}
+			return convertGoValueToJS(vm, goValue.Elem())
+		}
+
+		if goValue.Kind() == reflect.Struct {
+			obj := vm.NewObject()
+			for i := 0; i < goValue.NumField(); i++ {
+				field := goValue.Type().Field(i)
+				fieldName := getFieldName(field)
+				_ = obj.Set(fieldName, convertGoValueToJS(vm, goValue.Field(i)))
+			}
+			return obj
+		}
+
+		return vm.ToValue(v)
+	}
+}
+
+func getFieldName(field reflect.StructField) string {
+	jsonTag := field.Tag.Get("json")
+	if jsonTag != "" && jsonTag != "-" {
+		name, _, _ := strings.Cut(jsonTag, ",")
+		return name
+	}
+	return field.Name
+}