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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"
"errors"
"fmt"
"github.com/spf13/cast"
"reflect"
"strconv"
"strings"
"unsafe"
)
type StringConverter func(string) any
type StringConverterE func(string) (any, error)
func (c StringConverterE) Converter() StringConverter {
if c == nil {
return nil
}
return func(value string) any {
r, _ := c(value)
return r
}
}
var (
invalidValue = reflect.Value{}
)
// Default converters for basic types.
/*var ConverterMaps = map[reflect.Kind]StringConverter{
reflect.Bool: stringConvertBool,
reflect.Float32: stringConvertFloat32,
reflect.Float64: stringConvertFloat64,
reflect.Int: stringConvertInt,
reflect.Int8: stringConvertInt8,
reflect.Int16: stringConvertInt16,
reflect.Int32: stringConvertInt32,
reflect.Int64: stringConvertInt64,
reflect.String: stringConvertString,
reflect.Uint: stringConvertUint,
reflect.Uint8: stringConvertUint8,
reflect.Uint16: stringConvertUint16,
reflect.Uint32: stringConvertUint32,
reflect.Uint64: stringConvertUint64,
}*/
// Deprecated: unsupported slices array map
var StringConverterArrays = []StringConverterE{
reflect.Bool: stringConvertBool,
reflect.Int: stringConvertInt,
reflect.Int8: stringConvertInt8,
reflect.Int16: stringConvertInt16,
reflect.Int32: stringConvertInt32,
reflect.Int64: stringConvertInt64,
reflect.Uint: stringConvertUint,
reflect.Uint8: stringConvertUint8,
reflect.Uint16: stringConvertUint16,
reflect.Uint32: stringConvertUint32,
reflect.Uint64: stringConvertUint64,
reflect.Float32: stringConvertFloat32,
reflect.Float64: stringConvertFloat64,
reflect.String: stringConvertString,
}
const (
array = 100
ArrayBool = reflect.Bool + array
ArrayInt = reflect.Int + array
ArrayInt8 = reflect.Int8 + array
ArrayInt16 = reflect.Int16 + array
ArrayInt32 = reflect.Int32 + array
ArrayInt64 = reflect.Int64 + array
ArrayUint = reflect.Uint + array
ArrayUint8 = reflect.Uint8 + array
ArrayUint16 = reflect.Uint16 + array
ArrayUint32 = reflect.Uint32 + array
ArrayUint64 = reflect.Uint64 + array
ArrayFloat32 = reflect.Float32 + array
ArrayFloat64 = reflect.Float64 + array
ArrayString = reflect.String + array
)
const (
slice = 200
SliceBool = reflect.Bool + slice
SliceInt = reflect.Int + slice
SliceInt8 = reflect.Int8 + slice
SliceInt16 = reflect.Int16 + slice
SliceInt32 = reflect.Int32 + slice
SliceInt64 = reflect.Int64 + slice
SliceUint = reflect.Uint + slice
SliceUint8 = reflect.Uint8 + slice
SliceUint16 = reflect.Uint16 + slice
SliceUint32 = reflect.Uint32 + slice
SliceUint64 = reflect.Uint64 + slice
SliceFloat32 = reflect.Float32 + slice
SliceFloat64 = reflect.Float64 + slice
SliceString = reflect.String + slice
)
func stringConvertBool(value string) (any, error) {
if value == "on" {
return true, nil
}
return strconv.ParseBool(value)
}
func stringConvertFloat32(value string) (any, error) {
f, err := strconv.ParseFloat(value, 32)
if err != nil {
return 0, err
}
return float32(f), nil
}
func stringConvertFloat64(value string) (any, error) {
return strconv.ParseFloat(value, 64)
}
func stringConvertInt(value string) (any, error) {
i, err := strconv.ParseInt(value, 10, 0)
if err != nil {
return 0, err
}
return int(i), nil
}
func stringConvertInt8(value string) (any, error) {
i, err := strconv.ParseInt(value, 10, 8)
if err != nil {
return 0, err
}
return int8(i), nil
}
func stringConvertInt16(value string) (any, error) {
i, err := strconv.ParseInt(value, 10, 16)
if err != nil {
return 0, err
}
return int16(i), nil
}
func stringConvertInt32(value string) (any, error) {
i, err := strconv.ParseInt(value, 10, 32)
if err != nil {
return 0, err
}
return int32(i), nil
}
func stringConvertInt64(value string) (any, error) {
return strconv.ParseInt(value, 10, 64)
}
func stringConvertString(value string) (any, error) {
return value, nil
}
// TODO
func stringConvertArray(value string) (any, error) {
return value, nil
}
func stringConvertUint(value string) (any, error) {
u, err := strconv.ParseUint(value, 10, 0)
if err != nil {
return 0, err
}
return uint(u), nil
}
func stringConvertUint8(value string) (any, error) {
u, err := strconv.ParseUint(value, 10, 8)
if err != nil {
return 0, err
}
return uint8(u), nil
}
func stringConvertUint16(value string) (any, error) {
u, err := strconv.ParseUint(value, 10, 16)
if err != nil {
return 0, err
}
return uint16(u), nil
}
func stringConvertUint32(value string) (any, error) {
u, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return 0, err
}
return uint32(u), nil
}
func stringConvertUint64(value string) (any, error) {
return strconv.ParseUint(value, 10, 64)
}
func CastInt64(v any) int64 {
return cast.ToInt64(v)
}
func SetFieldByString(dst any, field, value string) error {
if value == "" {
return nil
}
fieldValue := reflect.ValueOf(dst).Elem().FieldByName(field)
return SetValueByString(fieldValue, value)
}
func SetValueByString(field reflect.Value, value string) error {
if value == "" {
return nil
}
v := field.Interface()
if t, ok := v.(encoding.TextUnmarshaler); ok {
return t.UnmarshalText([]byte(value))
}
kind := field.Kind()
if kind == reflect.Ptr {
if field.IsNil() {
field.Set(reflect.New(field.Type().Elem()))
}
field = field.Elem()
v = field.Interface()
if t, ok := v.(encoding.TextUnmarshaler); ok {
return t.UnmarshalText([]byte(value))
}
kind = field.Kind()
}
switch kind {
case reflect.Array, reflect.Slice:
subType := field.Type().Elem()
eKind := subType.Kind()
if eKind == reflect.Array || eKind == reflect.Slice || eKind == reflect.Map {
return fmt.Errorf("unsupported sub type %v", subType)
}
strs := strings.Split(value, ",")
if kind == reflect.Slice {
field.Set(reflect.MakeSlice(field.Type(), len(strs), len(strs)))
}
for i := 0; i < field.Len(); i++ {
if err := SetValueByString(field.Index(i), strs[i]); err != nil {
return err
}
}
case reflect.Map:
subType := field.Type().Elem()
eKind := subType.Kind()
if eKind == reflect.Array || eKind == reflect.Slice || eKind == reflect.Map {
return fmt.Errorf("unsupported sub type %v", subType)
}
strs := strings.Split(value, ",")
field.Set(reflect.MakeMapWithSize(field.Type(), len(strs)/2))
for i := 0; i < len(strs)/2; i += 2 {
key := reflect.New(field.Type().Key())
err := SetValueByString(key, strs[i])
if err != nil {
return err
}
v := reflect.New(field.Type().Elem())
err = SetValueByString(v, strs[i+1])
if err != nil {
return err
}
field.SetMapIndex(key, v)
}
}
v, err := StringConvert(kind, value)
if err == nil {
field.Set(reflect.ValueOf(v))
return nil
}
return err
}
func StringConvert(kind reflect.Kind, value string) (any, error) {
converter := StringConverterArrays[kind]
if converter != nil {
return converter(value)
}
return nil, errors.New("unsupported kind")
}
func StringConvertFor[T any](value string) (T, error) {
kind := reflect.TypeFor[T]().Kind()
converter := StringConverterArrays[kind]
if converter != nil {
if v, err := converter(value); err != nil {
return *new(T), err
} else {
return v.(T), nil
}
} else {
var v T
a, ap := any(v), any(&v)
vv, ok := a.(encoding.TextUnmarshaler)
if !ok {
vv, ok = ap.(encoding.TextUnmarshaler)
}
if ok {
err := vv.UnmarshalText([]byte(value))
if err != nil {
return v, err
}
}
}
return *new(T), errors.New("unsupported kind")
}
func StringConvertBasicFor[T any](value string) (T, error) {
var v T
a, ap := any(v), any(&v)
switch vv := a.(type) {
case encoding.TextUnmarshaler:
err := vv.UnmarshalText([]byte(value))
if err != nil {
return v, err
}
return v, nil
case string:
return any(value).(T), nil
case int, int8, int16, int32, int64:
i, err := strconv.ParseInt(value, 10, int(unsafe.Sizeof(v))*8)
if err != nil {
return v, err
}
switch vv.(type) {
case int:
return any(int(i)).(T), nil
case int8:
return any(int8(i)).(T), nil
case uint16:
return any(int16(i)).(T), nil
case int32:
return any(int32(i)).(T), nil
case int64:
return any(i).(T), nil
}
case uint, uint8, uint16, uint32, uint64:
i, err := strconv.ParseUint(value, 10, int(unsafe.Sizeof(v))*8)
if err != nil {
return v, err
}
switch vv.(type) {
case uint:
return any(uint(i)).(T), nil
case uint8:
return any(uint8(i)).(T), nil
case uint16:
return any(uint16(i)).(T), nil
case uint32:
return any(uint32(i)).(T), nil
case uint64:
return any(i).(T), nil
}
case float64, float32:
f, err := strconv.ParseFloat(value, int(unsafe.Sizeof(v))*8)
if err != nil {
return v, err
}
switch vv.(type) {
case float64:
return any(f).(T), nil
case float32:
return any(float32(f)).(T), nil
}
case bool:
b, err := strconv.ParseBool(value)
if err != nil {
return v, err
}
return any(b).(T), nil
}
switch vv := ap.(type) {
case encoding.TextUnmarshaler:
err := vv.UnmarshalText([]byte(value))
if err != nil {
return v, err
}
return v, nil
}
return *new(T), errors.New("unsupported type")
}
func String(value reflect.Value) string {
v := value.Interface()
if t, ok := v.(encoding.TextMarshaler); ok {
s, _ := t.MarshalText()
return string(s)
}
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)
case reflect.Array, reflect.Slice:
var strs []string
for i := 0; i < value.Len(); i++ {
strs = append(strs, String(value.Index(i)))
}
return strings.Join(strs, ",")
}
return ""
}
func StringFor[T any](t T) string {
v := reflect.ValueOf(t)
return String(v)
}