forked from andeya/faygo
/
convert.go
165 lines (144 loc) · 4.35 KB
/
convert.go
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// Copyright 2016 HenryLee. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package apiware
import (
"fmt"
"reflect"
"strconv"
"strings"
)
// ConvertAssign type conversions for request params.
//
// ConvertAssign copies to dest the value in src, converting it if possible.
// An error is returned if the copy would result in loss of information.
// dest should be a pointer type.
func ConvertAssign(dest reflect.Value, src ...string) (err error) {
return convertAssign(dest, src)
}
func convertAssign(dest reflect.Value, src []string) (err error) {
if len(src) == 0 {
return nil
}
dest = reflect.Indirect(dest)
if !dest.CanSet() {
return fmt.Errorf("%s can not be setted", dest.Type().Name())
}
defer func() {
if p := recover(); p != nil {
err = fmt.Errorf("%v", p)
}
}()
switch dest.Interface().(type) {
case string:
dest.Set(reflect.ValueOf(src[0]))
return nil
case []string:
dest.Set(reflect.ValueOf(src))
return nil
case []byte:
dest.Set(reflect.ValueOf([]byte(src[0])))
return nil
case [][]byte:
b := make([][]byte, 0, len(src))
for _, s := range src {
b = append(b, []byte(s))
}
dest.Set(reflect.ValueOf(b))
return nil
case bool:
dest.Set(reflect.ValueOf(parseBool(src[0])))
return nil
case []bool:
b := make([]bool, 0, len(src))
for _, s := range src {
b = append(b, parseBool(s))
}
dest.Set(reflect.ValueOf(b))
return nil
}
switch dest.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
i64, err := strconv.ParseInt(src[0], 10, dest.Type().Bits())
if err != nil {
err = strconvErr(err)
return fmt.Errorf("converting type %T (%q) to a %s: %v", src, src[0], dest.Kind(), err)
}
dest.SetInt(i64)
return nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
u64, err := strconv.ParseUint(src[0], 10, dest.Type().Bits())
if err != nil {
err = strconvErr(err)
return fmt.Errorf("converting type %T (%q) to a %s: %v", src, src[0], dest.Kind(), err)
}
dest.SetUint(u64)
return nil
case reflect.Float32, reflect.Float64:
f64, err := strconv.ParseFloat(src[0], dest.Type().Bits())
if err != nil {
err = strconvErr(err)
return fmt.Errorf("converting type %T (%q) to a %s: %v", src, src[0], dest.Kind(), err)
}
dest.SetFloat(f64)
return nil
case reflect.Slice:
member := dest.Type().Elem()
switch member.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
for _, s := range src {
i64, err := strconv.ParseInt(s, 10, member.Bits())
if err != nil {
err = strconvErr(err)
return fmt.Errorf("converting type %T (%q) to a %s: %v", src, s, dest.Kind(), err)
}
dest.Set(reflect.Append(dest, reflect.ValueOf(i64).Convert(member)))
}
return nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
for _, s := range src {
u64, err := strconv.ParseUint(s, 10, member.Bits())
if err != nil {
err = strconvErr(err)
return fmt.Errorf("converting type %T (%q) to a %s: %v", src, s, dest.Kind(), err)
}
dest.Set(reflect.Append(dest, reflect.ValueOf(u64).Convert(member)))
}
return nil
case reflect.Float32, reflect.Float64:
for _, s := range src {
f64, err := strconv.ParseFloat(s, member.Bits())
if err != nil {
err = strconvErr(err)
return fmt.Errorf("converting type %T (%q) to a %s: %v", src, s, dest.Kind(), err)
}
dest.Set(reflect.Append(dest, reflect.ValueOf(f64).Convert(member)))
}
return nil
}
}
return fmt.Errorf("unsupported storing type %T into type %s", src, dest.Kind())
}
func parseBool(val string) bool {
switch strings.TrimSpace(strings.ToLower(val)) {
case "true", "on", "1":
return true
}
return false
}
func strconvErr(err error) error {
if ne, ok := err.(*strconv.NumError); ok {
return ne.Err
}
return err
}