675 lines
17 KiB
Go
675 lines
17 KiB
Go
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package goja
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import (
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"fmt"
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"go/ast"
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"reflect"
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"strings"
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"github.com/dop251/goja/parser"
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"github.com/dop251/goja/unistring"
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)
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// JsonEncodable allows custom JSON encoding by JSON.stringify()
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// Note that if the returned value itself also implements JsonEncodable, it won't have any effect.
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type JsonEncodable interface {
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JsonEncodable() interface{}
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}
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// FieldNameMapper provides custom mapping between Go and JavaScript property names.
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type FieldNameMapper interface {
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// FieldName returns a JavaScript name for the given struct field in the given type.
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// If this method returns "" the field becomes hidden.
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FieldName(t reflect.Type, f reflect.StructField) string
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// MethodName returns a JavaScript name for the given method in the given type.
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// If this method returns "" the method becomes hidden.
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MethodName(t reflect.Type, m reflect.Method) string
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}
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type tagFieldNameMapper struct {
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tagName string
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uncapMethods bool
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}
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func (tfm tagFieldNameMapper) FieldName(_ reflect.Type, f reflect.StructField) string {
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tag := f.Tag.Get(tfm.tagName)
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if idx := strings.IndexByte(tag, ','); idx != -1 {
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tag = tag[:idx]
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}
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if parser.IsIdentifier(tag) {
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return tag
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}
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return ""
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}
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func uncapitalize(s string) string {
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return strings.ToLower(s[0:1]) + s[1:]
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}
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func (tfm tagFieldNameMapper) MethodName(_ reflect.Type, m reflect.Method) string {
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if tfm.uncapMethods {
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return uncapitalize(m.Name)
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}
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return m.Name
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}
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type uncapFieldNameMapper struct {
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}
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func (u uncapFieldNameMapper) FieldName(_ reflect.Type, f reflect.StructField) string {
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return uncapitalize(f.Name)
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}
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func (u uncapFieldNameMapper) MethodName(_ reflect.Type, m reflect.Method) string {
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return uncapitalize(m.Name)
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}
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type reflectFieldInfo struct {
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Index []int
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Anonymous bool
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}
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type reflectFieldsInfo struct {
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Fields map[string]reflectFieldInfo
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Names []string
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}
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type reflectMethodsInfo struct {
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Methods map[string]int
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Names []string
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}
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type reflectValueWrapper interface {
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esValue() Value
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reflectValue() reflect.Value
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setReflectValue(reflect.Value)
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}
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func isContainer(k reflect.Kind) bool {
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switch k {
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case reflect.Struct, reflect.Slice, reflect.Array:
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return true
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}
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return false
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}
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func copyReflectValueWrapper(w reflectValueWrapper) {
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v := w.reflectValue()
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c := reflect.New(v.Type()).Elem()
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c.Set(v)
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w.setReflectValue(c)
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}
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type objectGoReflect struct {
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baseObject
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origValue, fieldsValue reflect.Value
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fieldsInfo *reflectFieldsInfo
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methodsInfo *reflectMethodsInfo
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methodsValue reflect.Value
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valueCache map[string]reflectValueWrapper
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toString, valueOf func() Value
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toJson func() interface{}
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}
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func (o *objectGoReflect) init() {
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o.baseObject.init()
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switch o.fieldsValue.Kind() {
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case reflect.Bool:
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o.class = classBoolean
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o.prototype = o.val.runtime.getBooleanPrototype()
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o.toString = o._toStringBool
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o.valueOf = o._valueOfBool
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case reflect.String:
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o.class = classString
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o.prototype = o.val.runtime.getStringPrototype()
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o.toString = o._toStringString
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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o.class = classNumber
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o.prototype = o.val.runtime.getNumberPrototype()
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o.valueOf = o._valueOfInt
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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o.class = classNumber
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o.prototype = o.val.runtime.getNumberPrototype()
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o.valueOf = o._valueOfUint
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case reflect.Float32, reflect.Float64:
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o.class = classNumber
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o.prototype = o.val.runtime.getNumberPrototype()
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o.valueOf = o._valueOfFloat
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default:
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o.class = classObject
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o.prototype = o.val.runtime.global.ObjectPrototype
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}
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if o.fieldsValue.Kind() == reflect.Struct {
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o.fieldsInfo = o.val.runtime.fieldsInfo(o.fieldsValue.Type())
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}
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var methodsType reflect.Type
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// Always use pointer type for non-interface values to be able to access both methods defined on
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// the literal type and on the pointer.
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if o.fieldsValue.Kind() != reflect.Interface {
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methodsType = reflect.PtrTo(o.fieldsValue.Type())
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} else {
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methodsType = o.fieldsValue.Type()
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}
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o.methodsInfo = o.val.runtime.methodsInfo(methodsType)
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// Container values and values that have at least one method defined on the pointer type
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// need to be addressable.
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if !o.origValue.CanAddr() && (isContainer(o.origValue.Kind()) || len(o.methodsInfo.Names) > 0) {
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value := reflect.New(o.origValue.Type()).Elem()
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value.Set(o.origValue)
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o.origValue = value
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if value.Kind() != reflect.Ptr {
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o.fieldsValue = value
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}
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}
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o.extensible = true
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switch o.origValue.Interface().(type) {
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case fmt.Stringer:
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o.toString = o._toStringStringer
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case error:
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o.toString = o._toStringError
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}
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if len(o.methodsInfo.Names) > 0 && o.fieldsValue.Kind() != reflect.Interface {
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o.methodsValue = o.fieldsValue.Addr()
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} else {
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o.methodsValue = o.fieldsValue
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}
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if j, ok := o.origValue.Interface().(JsonEncodable); ok {
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o.toJson = j.JsonEncodable
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}
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}
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func (o *objectGoReflect) getStr(name unistring.String, receiver Value) Value {
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if v := o._get(name.String()); v != nil {
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return v
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}
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return o.baseObject.getStr(name, receiver)
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}
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func (o *objectGoReflect) _getField(jsName string) reflect.Value {
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if o.fieldsInfo != nil {
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if info, exists := o.fieldsInfo.Fields[jsName]; exists {
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return o.fieldsValue.FieldByIndex(info.Index)
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}
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}
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return reflect.Value{}
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}
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func (o *objectGoReflect) _getMethod(jsName string) reflect.Value {
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if o.methodsInfo != nil {
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if idx, exists := o.methodsInfo.Methods[jsName]; exists {
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return o.methodsValue.Method(idx)
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}
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}
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return reflect.Value{}
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}
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func (o *objectGoReflect) elemToValue(ev reflect.Value) (Value, reflectValueWrapper) {
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if isContainer(ev.Kind()) {
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ret := o.val.runtime.toValue(ev.Interface(), ev)
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if obj, ok := ret.(*Object); ok {
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if w, ok := obj.self.(reflectValueWrapper); ok {
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return ret, w
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}
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}
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return ret, nil
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}
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if ev.Kind() == reflect.Interface {
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ev = ev.Elem()
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}
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if ev.Kind() == reflect.Invalid {
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return _null, nil
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}
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return o.val.runtime.toValue(ev.Interface(), ev), nil
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}
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func (o *objectGoReflect) _getFieldValue(name string) Value {
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if v := o.valueCache[name]; v != nil {
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return v.esValue()
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}
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if v := o._getField(name); v.IsValid() {
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res, w := o.elemToValue(v)
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if w != nil {
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if o.valueCache == nil {
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o.valueCache = make(map[string]reflectValueWrapper)
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}
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o.valueCache[name] = w
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}
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return res
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}
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return nil
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}
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func (o *objectGoReflect) _get(name string) Value {
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if o.fieldsValue.Kind() == reflect.Struct {
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if ret := o._getFieldValue(name); ret != nil {
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return ret
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}
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}
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if v := o._getMethod(name); v.IsValid() {
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return o.val.runtime.toValue(v.Interface(), v)
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}
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return nil
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}
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func (o *objectGoReflect) getOwnPropStr(name unistring.String) Value {
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n := name.String()
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if o.fieldsValue.Kind() == reflect.Struct {
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if v := o._getFieldValue(n); v != nil {
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return &valueProperty{
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value: v,
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writable: true,
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enumerable: true,
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}
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}
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}
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if v := o._getMethod(n); v.IsValid() {
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return &valueProperty{
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value: o.val.runtime.toValue(v.Interface(), v),
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enumerable: true,
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}
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}
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return o.baseObject.getOwnPropStr(name)
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}
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func (o *objectGoReflect) setOwnStr(name unistring.String, val Value, throw bool) bool {
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has, ok := o._put(name.String(), val, throw)
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if !has {
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if res, ok := o._setForeignStr(name, nil, val, o.val, throw); !ok {
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o.val.runtime.typeErrorResult(throw, "Cannot assign to property %s of a host object", name)
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return false
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} else {
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return res
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}
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}
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return ok
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}
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func (o *objectGoReflect) setForeignStr(name unistring.String, val, receiver Value, throw bool) (bool, bool) {
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return o._setForeignStr(name, trueValIfPresent(o._has(name.String())), val, receiver, throw)
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}
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func (o *objectGoReflect) setForeignIdx(idx valueInt, val, receiver Value, throw bool) (bool, bool) {
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return o._setForeignIdx(idx, nil, val, receiver, throw)
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}
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func (o *objectGoReflect) _put(name string, val Value, throw bool) (has, ok bool) {
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if o.fieldsValue.Kind() == reflect.Struct {
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if v := o._getField(name); v.IsValid() {
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cached := o.valueCache[name]
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if cached != nil {
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copyReflectValueWrapper(cached)
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}
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err := o.val.runtime.toReflectValue(val, v, &objectExportCtx{})
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if err != nil {
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if cached != nil {
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cached.setReflectValue(v)
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}
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o.val.runtime.typeErrorResult(throw, "Go struct conversion error: %v", err)
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return true, false
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}
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if cached != nil {
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delete(o.valueCache, name)
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}
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return true, true
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}
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}
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return false, false
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}
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func (o *objectGoReflect) _putProp(name unistring.String, value Value, writable, enumerable, configurable bool) Value {
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if _, ok := o._put(name.String(), value, false); ok {
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return value
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}
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return o.baseObject._putProp(name, value, writable, enumerable, configurable)
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}
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func (r *Runtime) checkHostObjectPropertyDescr(name unistring.String, descr PropertyDescriptor, throw bool) bool {
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if descr.Getter != nil || descr.Setter != nil {
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r.typeErrorResult(throw, "Host objects do not support accessor properties")
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return false
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}
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if descr.Writable == FLAG_FALSE {
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r.typeErrorResult(throw, "Host object field %s cannot be made read-only", name)
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return false
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}
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if descr.Configurable == FLAG_TRUE {
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r.typeErrorResult(throw, "Host object field %s cannot be made configurable", name)
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return false
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}
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return true
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}
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func (o *objectGoReflect) defineOwnPropertyStr(name unistring.String, descr PropertyDescriptor, throw bool) bool {
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if o.val.runtime.checkHostObjectPropertyDescr(name, descr, throw) {
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n := name.String()
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if has, ok := o._put(n, descr.Value, throw); !has {
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o.val.runtime.typeErrorResult(throw, "Cannot define property '%s' on a host object", n)
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return false
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} else {
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return ok
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}
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}
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return false
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}
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func (o *objectGoReflect) _has(name string) bool {
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if o.fieldsValue.Kind() == reflect.Struct {
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if v := o._getField(name); v.IsValid() {
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return true
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}
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}
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if v := o._getMethod(name); v.IsValid() {
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return true
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}
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return false
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}
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func (o *objectGoReflect) hasOwnPropertyStr(name unistring.String) bool {
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|
|
return o._has(name.String()) || o.baseObject.hasOwnPropertyStr(name)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _valueOfInt() Value {
|
||
|
|
return intToValue(o.fieldsValue.Int())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _valueOfUint() Value {
|
||
|
|
return intToValue(int64(o.fieldsValue.Uint()))
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _valueOfBool() Value {
|
||
|
|
if o.fieldsValue.Bool() {
|
||
|
|
return valueTrue
|
||
|
|
} else {
|
||
|
|
return valueFalse
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _valueOfFloat() Value {
|
||
|
|
return floatToValue(o.fieldsValue.Float())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _toStringStringer() Value {
|
||
|
|
return newStringValue(o.origValue.Interface().(fmt.Stringer).String())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _toStringString() Value {
|
||
|
|
return newStringValue(o.fieldsValue.String())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _toStringBool() Value {
|
||
|
|
if o.fieldsValue.Bool() {
|
||
|
|
return stringTrue
|
||
|
|
} else {
|
||
|
|
return stringFalse
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) _toStringError() Value {
|
||
|
|
return newStringValue(o.origValue.Interface().(error).Error())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) deleteStr(name unistring.String, throw bool) bool {
|
||
|
|
n := name.String()
|
||
|
|
if o._has(n) {
|
||
|
|
o.val.runtime.typeErrorResult(throw, "Cannot delete property %s from a Go type", n)
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
return o.baseObject.deleteStr(name, throw)
|
||
|
|
}
|
||
|
|
|
||
|
|
type goreflectPropIter struct {
|
||
|
|
o *objectGoReflect
|
||
|
|
idx int
|
||
|
|
}
|
||
|
|
|
||
|
|
func (i *goreflectPropIter) nextField() (propIterItem, iterNextFunc) {
|
||
|
|
names := i.o.fieldsInfo.Names
|
||
|
|
if i.idx < len(names) {
|
||
|
|
name := names[i.idx]
|
||
|
|
i.idx++
|
||
|
|
return propIterItem{name: newStringValue(name), enumerable: _ENUM_TRUE}, i.nextField
|
||
|
|
}
|
||
|
|
|
||
|
|
i.idx = 0
|
||
|
|
return i.nextMethod()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (i *goreflectPropIter) nextMethod() (propIterItem, iterNextFunc) {
|
||
|
|
names := i.o.methodsInfo.Names
|
||
|
|
if i.idx < len(names) {
|
||
|
|
name := names[i.idx]
|
||
|
|
i.idx++
|
||
|
|
return propIterItem{name: newStringValue(name), enumerable: _ENUM_TRUE}, i.nextMethod
|
||
|
|
}
|
||
|
|
|
||
|
|
return propIterItem{}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) iterateStringKeys() iterNextFunc {
|
||
|
|
r := &goreflectPropIter{
|
||
|
|
o: o,
|
||
|
|
}
|
||
|
|
if o.fieldsInfo != nil {
|
||
|
|
return r.nextField
|
||
|
|
}
|
||
|
|
|
||
|
|
return r.nextMethod
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) stringKeys(_ bool, accum []Value) []Value {
|
||
|
|
// all own keys are enumerable
|
||
|
|
if o.fieldsInfo != nil {
|
||
|
|
for _, name := range o.fieldsInfo.Names {
|
||
|
|
accum = append(accum, newStringValue(name))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, name := range o.methodsInfo.Names {
|
||
|
|
accum = append(accum, newStringValue(name))
|
||
|
|
}
|
||
|
|
|
||
|
|
return accum
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) export(*objectExportCtx) interface{} {
|
||
|
|
return o.origValue.Interface()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) exportType() reflect.Type {
|
||
|
|
return o.origValue.Type()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) equal(other objectImpl) bool {
|
||
|
|
if other, ok := other.(*objectGoReflect); ok {
|
||
|
|
k1, k2 := o.fieldsValue.Kind(), other.fieldsValue.Kind()
|
||
|
|
if k1 == k2 {
|
||
|
|
if isContainer(k1) {
|
||
|
|
return o.fieldsValue == other.fieldsValue
|
||
|
|
}
|
||
|
|
return o.fieldsValue.Interface() == other.fieldsValue.Interface()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) reflectValue() reflect.Value {
|
||
|
|
return o.fieldsValue
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) setReflectValue(v reflect.Value) {
|
||
|
|
o.fieldsValue = v
|
||
|
|
o.origValue = v
|
||
|
|
o.methodsValue = v.Addr()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *objectGoReflect) esValue() Value {
|
||
|
|
return o.val
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *Runtime) buildFieldInfo(t reflect.Type, index []int, info *reflectFieldsInfo) {
|
||
|
|
n := t.NumField()
|
||
|
|
for i := 0; i < n; i++ {
|
||
|
|
field := t.Field(i)
|
||
|
|
name := field.Name
|
||
|
|
isExported := ast.IsExported(name)
|
||
|
|
|
||
|
|
if !isExported && !field.Anonymous {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if r.fieldNameMapper != nil {
|
||
|
|
name = r.fieldNameMapper.FieldName(t, field)
|
||
|
|
}
|
||
|
|
|
||
|
|
if name != "" && isExported {
|
||
|
|
if inf, exists := info.Fields[name]; !exists {
|
||
|
|
info.Names = append(info.Names, name)
|
||
|
|
} else {
|
||
|
|
if len(inf.Index) <= len(index) {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if name != "" || field.Anonymous {
|
||
|
|
idx := make([]int, len(index)+1)
|
||
|
|
copy(idx, index)
|
||
|
|
idx[len(idx)-1] = i
|
||
|
|
|
||
|
|
if name != "" && isExported {
|
||
|
|
info.Fields[name] = reflectFieldInfo{
|
||
|
|
Index: idx,
|
||
|
|
Anonymous: field.Anonymous,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if field.Anonymous {
|
||
|
|
typ := field.Type
|
||
|
|
for typ.Kind() == reflect.Ptr {
|
||
|
|
typ = typ.Elem()
|
||
|
|
}
|
||
|
|
if typ.Kind() == reflect.Struct {
|
||
|
|
r.buildFieldInfo(typ, idx, info)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var emptyMethodsInfo = reflectMethodsInfo{}
|
||
|
|
|
||
|
|
func (r *Runtime) buildMethodsInfo(t reflect.Type) (info *reflectMethodsInfo) {
|
||
|
|
n := t.NumMethod()
|
||
|
|
if n == 0 {
|
||
|
|
return &emptyMethodsInfo
|
||
|
|
}
|
||
|
|
info = new(reflectMethodsInfo)
|
||
|
|
info.Methods = make(map[string]int, n)
|
||
|
|
info.Names = make([]string, 0, n)
|
||
|
|
for i := 0; i < n; i++ {
|
||
|
|
method := t.Method(i)
|
||
|
|
name := method.Name
|
||
|
|
if !ast.IsExported(name) {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
if r.fieldNameMapper != nil {
|
||
|
|
name = r.fieldNameMapper.MethodName(t, method)
|
||
|
|
if name == "" {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if _, exists := info.Methods[name]; !exists {
|
||
|
|
info.Names = append(info.Names, name)
|
||
|
|
}
|
||
|
|
|
||
|
|
info.Methods[name] = i
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *Runtime) buildFieldsInfo(t reflect.Type) (info *reflectFieldsInfo) {
|
||
|
|
info = new(reflectFieldsInfo)
|
||
|
|
n := t.NumField()
|
||
|
|
info.Fields = make(map[string]reflectFieldInfo, n)
|
||
|
|
info.Names = make([]string, 0, n)
|
||
|
|
r.buildFieldInfo(t, nil, info)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *Runtime) fieldsInfo(t reflect.Type) (info *reflectFieldsInfo) {
|
||
|
|
var exists bool
|
||
|
|
if info, exists = r.fieldsInfoCache[t]; !exists {
|
||
|
|
info = r.buildFieldsInfo(t)
|
||
|
|
if r.fieldsInfoCache == nil {
|
||
|
|
r.fieldsInfoCache = make(map[reflect.Type]*reflectFieldsInfo)
|
||
|
|
}
|
||
|
|
r.fieldsInfoCache[t] = info
|
||
|
|
}
|
||
|
|
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (r *Runtime) methodsInfo(t reflect.Type) (info *reflectMethodsInfo) {
|
||
|
|
var exists bool
|
||
|
|
if info, exists = r.methodsInfoCache[t]; !exists {
|
||
|
|
info = r.buildMethodsInfo(t)
|
||
|
|
if r.methodsInfoCache == nil {
|
||
|
|
r.methodsInfoCache = make(map[reflect.Type]*reflectMethodsInfo)
|
||
|
|
}
|
||
|
|
r.methodsInfoCache[t] = info
|
||
|
|
}
|
||
|
|
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetFieldNameMapper sets a custom field name mapper for Go types. It can be called at any time, however
|
||
|
|
// the mapping for any given value is fixed at the point of creation.
|
||
|
|
// Setting this to nil restores the default behaviour which is all exported fields and methods are mapped to their
|
||
|
|
// original unchanged names.
|
||
|
|
func (r *Runtime) SetFieldNameMapper(mapper FieldNameMapper) {
|
||
|
|
r.fieldNameMapper = mapper
|
||
|
|
r.fieldsInfoCache = nil
|
||
|
|
r.methodsInfoCache = nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// TagFieldNameMapper returns a FieldNameMapper that uses the given tagName for struct fields and optionally
|
||
|
|
// uncapitalises (making the first letter lower case) method names.
|
||
|
|
// The common tag value syntax is supported (name[,options]), however options are ignored.
|
||
|
|
// Setting name to anything other than a valid ECMAScript identifier makes the field hidden.
|
||
|
|
func TagFieldNameMapper(tagName string, uncapMethods bool) FieldNameMapper {
|
||
|
|
return tagFieldNameMapper{
|
||
|
|
tagName: tagName,
|
||
|
|
uncapMethods: uncapMethods,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// UncapFieldNameMapper returns a FieldNameMapper that uncapitalises struct field and method names
|
||
|
|
// making the first letter lower case.
|
||
|
|
func UncapFieldNameMapper() FieldNameMapper {
|
||
|
|
return uncapFieldNameMapper{}
|
||
|
|
}
|