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converter.go
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converter.go
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// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package converter
import (
"encoding/json"
"errors"
"reflect"
"strconv"
)
type Converter func(string) any
var (
invalidValue = reflect.Value{}
)
// Default converters for basic types.
/*var ConverterMaps = map[reflect.Kind]Converter{
reflect.Bool: convertBool,
reflect.Float32: convertFloat32,
reflect.Float64: convertFloat64,
reflect.Int: convertInt,
reflect.Int8: convertInt8,
reflect.Int16: convertInt16,
reflect.Int32: convertInt32,
reflect.Int64: convertInt64,
reflect.String: convertString,
reflect.Uint: convertUint,
reflect.Uint8: convertUint8,
reflect.Uint16: convertUint16,
reflect.Uint32: convertUint32,
reflect.Uint64: convertUint64,
}*/
var ConverterArrays = []Converter{
reflect.Bool: convertBool,
reflect.Int: convertInt,
reflect.Int8: convertInt8,
reflect.Int16: convertInt16,
reflect.Int32: convertInt32,
reflect.Int64: convertInt64,
reflect.Uint: convertUint,
reflect.Uint8: convertUint8,
reflect.Uint16: convertUint16,
reflect.Uint32: convertUint32,
reflect.Uint64: convertUint64,
reflect.Float32: convertFloat32,
reflect.Float64: convertFloat64,
reflect.String: convertString,
}
func convertBool(value string) any {
if value == "on" {
return true
} else if v, err := strconv.ParseBool(value); err == nil {
return v
}
return nil
}
func convertFloat32(value string) any {
if v, err := strconv.ParseFloat(value, 32); err == nil {
return v
}
return nil
}
func convertFloat64(value string) any {
if v, err := strconv.ParseFloat(value, 64); err == nil {
return v
}
return nil
}
func convertInt(value string) any {
if v, err := strconv.ParseInt(value, 10, 0); err == nil {
return v
}
return nil
}
func convertInt8(value string) any {
if v, err := strconv.ParseInt(value, 10, 8); err == nil {
return v
}
return nil
}
func convertInt16(value string) any {
if v, err := strconv.ParseInt(value, 10, 16); err == nil {
return v
}
return nil
}
func convertInt32(value string) any {
if v, err := strconv.ParseInt(value, 10, 32); err == nil {
return v
}
return nil
}
func convertInt64(value string) any {
if v, err := strconv.ParseInt(value, 10, 64); err == nil {
return v
}
return nil
}
func convertString(value string) any {
return value
}
func convertUint(value string) any {
if v, err := strconv.ParseUint(value, 10, 0); err == nil {
return v
}
return nil
}
func convertUint8(value string) any {
if v, err := strconv.ParseUint(value, 10, 8); err == nil {
return v
}
return nil
}
func convertUint16(value string) any {
if v, err := strconv.ParseUint(value, 10, 16); err == nil {
return reflect.ValueOf(uint16(v))
}
return nil
}
func convertUint32(value string) any {
if v, err := strconv.ParseUint(value, 10, 32); err == nil {
return v
}
return nil
}
func convertUint64(value string) any {
if v, err := strconv.ParseUint(value, 10, 64); err == nil {
return v
}
return nil
}
func ConvertInt64(v interface{}) int64 {
switch v := v.(type) {
case int:
return int64(v)
case int64:
return v
case json.Number:
f, _ := v.Int64()
return f
default:
return 0
}
}
func SetStructFieldByString(field, value string, dst any) error {
if value == "" {
return nil
}
fieldValue := reflect.ValueOf(dst).Elem().FieldByName(field)
return SetFieldByString(value, fieldValue)
}
func SetFieldByString(value string, field reflect.Value) error {
if value == "" {
return nil
}
converter := ConverterArrays[field.Kind()]
if converter != nil {
if v := converter(value); v != nil {
field.Set(reflect.ValueOf(v))
return nil
}
}
return errors.New("unsupported kind")
}
func StringConvert(value string, kind reflect.Kind) (any, error) {
converter := ConverterArrays[kind]
if converter != nil {
if v := converter(value); v != nil {
return v, nil
}
}
return nil, errors.New("unsupported kind")
}
func AnyConvert[T any](v any) T {
return v.(T)
}
func String(value reflect.Value) string {
kind := value.Kind()
switch kind {
case reflect.Int, reflect.Int8, reflect.Int32, reflect.Int64, reflect.Pointer, reflect.UnsafePointer:
return strconv.FormatInt(value.Int(), 10)
case reflect.String:
return value.String()
case reflect.Bool:
return strconv.FormatBool(value.Bool())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(value.Uint(), 10)
case reflect.Float64, reflect.Float32:
return strconv.FormatFloat(value.Float(), 'g', -1, 64)
}
return ""
}