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goobject.go
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goobject.go
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package eval
import (
"errors"
"fmt"
"reflect"
"strings"
)
var (
ERR_HASDOT = errors.New("symbol contains '.'")
ERR_VALUENOTFUNCTION = errors.New("symbol value not function")
)
// Wrapper for go object
type GoObject struct {
obj interface{}
value reflect.Value
}
func (gobj *GoObject) iter() bool {
kind := gobj.value.Kind()
switch kind {
case reflect.Slice, reflect.Array:
return true
default:
return false
}
}
func (gobj *GoObject) Inspect() string { return fmt.Sprint(gobj.obj) }
func (gobj *GoObject) Type() ObjectType { return GO_OBJ }
func (gobj *GoObject) CallMethod(line string, scope *Scope, method string, args ...Object) Object {
methodValue := gobj.value.MethodByName(method)
if !methodValue.IsValid() {
return newError(line, ERR_NOMETHOD, method, gobj.Type())
}
return callGoMethod(line, methodValue, args...)
}
func NewGoObject(obj interface{}) *GoObject {
return &GoObject{obj: obj, value: reflect.ValueOf(obj)}
}
// wrapper for go functions
type GoFuncObject struct {
name string
typ reflect.Type
fn interface{}
}
func (gfn *GoFuncObject) Inspect() string { return gfn.name }
func (gfn *GoFuncObject) Type() ObjectType { return GFO_OBJ }
func (gfn *GoFuncObject) CallMethod(line string, scope *Scope, method string, args ...Object) Object {
return callGoMethod(line, reflect.ValueOf(gfn.fn), args...)
}
func NewGoFuncObject(fname string, fn interface{}) *GoFuncObject {
return &GoFuncObject{fname, reflect.TypeOf(fn), fn}
}
// Magpie language Object to go language Value.
func ObjectToGoValue(obj Object, typ reflect.Type) reflect.Value {
var v reflect.Value
switch obj := obj.(type) {
case *Number:
switch typ.Kind() {
case reflect.Int:
v = reflect.ValueOf(int(obj.Value))
case reflect.Int8:
v = reflect.ValueOf(int8(obj.Value))
case reflect.Int16:
v = reflect.ValueOf(int16(obj.Value))
case reflect.Int32:
v = reflect.ValueOf(int32(obj.Value))
case reflect.Int64:
v = reflect.ValueOf(int64(obj.Value))
case reflect.Uint:
v = reflect.ValueOf(uint(obj.Value))
case reflect.Uint8:
v = reflect.ValueOf(uint8(obj.Value))
case reflect.Uint16:
v = reflect.ValueOf(uint16(obj.Value))
case reflect.Uint32:
v = reflect.ValueOf(uint32(obj.Value))
case reflect.Uint64:
v = reflect.ValueOf(uint64(obj.Value))
default:
v = reflect.ValueOf(obj.Value)
}
case *String:
v = reflect.ValueOf(obj.String)
case *Boolean:
v = reflect.ValueOf(obj.Bool)
case *Nil:
v = reflect.ValueOf(nil)
case *GoObject:
v = obj.value
default:
v = reflect.ValueOf(obj)
}
return v
}
// Go language Value to magpie language Object(take care of slice object value)
func goValueToObject(v interface{}) Object {
val := reflect.ValueOf(v)
kind := val.Kind()
switch kind {
case reflect.Slice, reflect.Array:
ret := &Array{}
for i := 0; i < val.Len(); i++ {
ret.Members = append(ret.Members, goValueToObject(val.Index(i).Interface()))
}
return ret
case reflect.String:
return NewString(val.String())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return NewNumber(float64(val.Int()))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return NewNumber(float64(val.Uint()))
case reflect.Float32, reflect.Float64:
return NewNumber(val.Float())
case reflect.Bool:
if v.(bool) {
return TRUE
} else {
return FALSE
}
case reflect.Invalid: //nil
return NIL
default:
return NewGoObject(v)
}
}
func callGoMethod(line string, methodVal reflect.Value, args ...Object) (ret Object) {
defer func() {
if r := recover(); r != nil {
ret = newError(line, "error calling go method. %s", r)
}
}()
methodType := methodVal.Type()
//process arguments
callArgs := []reflect.Value{}
for i := 0; i < len(args); i++ {
reqTyp := methodType.In(i)
callArgs = append(callArgs, ObjectToGoValue(args[i], reqTyp))
}
retValues := methodVal.Call(callArgs) //call go method
//handling return value
var results []Object
for _, retVal := range retValues {
switch retVal.Kind() {
case reflect.Invalid: //nil
results = append(results, NIL)
case reflect.Bool:
results = append(results, NewBooleanObj(retVal.Bool()))
case reflect.String:
results = append(results, NewString(retVal.String()))
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
results = append(results, NewNumber(float64(retVal.Int())))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
results = append(results, NewNumber(float64(retVal.Uint())))
case reflect.Float64, reflect.Float32:
results = append(results, NewNumber(retVal.Float()))
default:
results = append(results, NewGoObject(retVal.Interface()))
}
}
if len(results) == 1 { //one return value
ret = results[0]
} else if len(results) > 1 { //multiple return values
ret = &Tuple{Members: results, IsMulti: true}
} else { //no return value
ret = NIL
}
return
}
func RegisterGoVars(name string, vars map[string]interface{}) error {
for k, v := range vars {
if strings.Contains(k, ".") {
return ERR_HASDOT
}
SetGlobalObj(name+"."+k, NewGoObject(v))
}
return nil
}
func RegisterGoFunctions(name string, vars map[string]interface{}) error {
hash := NewHash()
for k, v := range vars {
val := reflect.ValueOf(v)
if val.Kind() != reflect.Func { //if v is not a function
return ERR_VALUENOTFUNCTION
}
if strings.Contains(k, ".") {
return ERR_HASDOT
}
key := NewString(k)
hash.push("", key, NewGoFuncObject(k, v))
}
//Replace all '/' to '_'.
newName := strings.Replace(name, "/", "_", -1)
SetGlobalObj(newName, hash)
return nil
}