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helpers.go
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/
helpers.go
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package runtime
import (
"fmt"
"reflect"
)
func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() {
if v.IsNil() {
return v, true
}
}
return v, false
}
func indirectInterface(v reflect.Value) reflect.Value {
if v.Kind() != reflect.Interface {
return v
}
if v.IsNil() {
return reflect.Value{}
}
return v.Elem()
}
var errorType = reflect.TypeOf((*error)(nil)).Elem()
var reflectValueType = reflect.TypeOf((*reflect.Value)(nil)).Elem()
func goodFunc(typ reflect.Type) bool {
switch {
case typ.NumOut() == 1:
return true
case typ.NumOut() == 2 && typ.Out(1) == errorType:
return true
}
return false
}
func prepareArg(value reflect.Value, argType reflect.Type) (reflect.Value, error) {
if !value.IsValid() {
if !canBeNil(argType) {
return reflect.Value{}, fmt.Errorf("value is nil; should be of type %s", argType)
}
value = reflect.Zero(argType)
}
if !value.Type().AssignableTo(argType) {
return reflect.Value{}, fmt.Errorf("value has type %s; should be %s", value.Type(), argType)
}
return value, nil
}
func canBeNil(typ reflect.Type) bool {
switch typ.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
return true
case reflect.Struct:
return typ == reflectValueType
}
return false
}