forked from BoRuDar/configuration
/
fieldSetter.go
190 lines (168 loc) · 4.81 KB
/
fieldSetter.go
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package configuration
import (
"fmt"
"reflect"
"strconv"
"strings"
"time"
)
const sliceSeparator = ";"
// SetField sets field with `valStr` value (converts to the proper type beforehand)
func SetField(field reflect.StructField, v reflect.Value, valStr string) error {
if v.Kind() == reflect.Ptr {
return setPtrValue(field.Type, v, valStr)
}
return setValue(field.Type, v, valStr)
}
func setValue(t reflect.Type, v reflect.Value, val string) (err error) {
switch t.Kind() {
case reflect.String:
v.SetString(val)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32:
i, _ := strconv.ParseInt(val, 10, 64)
v.SetInt(i)
case reflect.Int64:
setInt64(v, val)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
i, _ := strconv.ParseUint(val, 10, 64)
v.SetUint(i)
case reflect.Float32, reflect.Float64:
f, _ := strconv.ParseFloat(val, 64)
v.SetFloat(f)
case reflect.Bool:
b, _ := strconv.ParseBool(val)
v.SetBool(b)
case reflect.Slice:
err = setSlice(t, v, val)
default:
err = fmt.Errorf("unsupported type: %v", v.Kind().String())
}
return
}
func setInt64(v reflect.Value, val string) {
// special case for parsing human readable input for time.Duration
if _, ok := v.Interface().(time.Duration); ok {
d, _ := time.ParseDuration(val)
v.SetInt(int64(d))
return
}
// regular int64 case
i, _ := strconv.ParseInt(val, 10, 64)
v.SetInt(i)
}
func setSlice(t reflect.Type, v reflect.Value, val string) error {
var items []string
for _, item := range strings.Split(val, sliceSeparator) {
item = strings.TrimSpace(item)
if len(item) > 0 {
items = append(items, item)
}
}
size := len(items)
if size == 0 {
return fmt.Errorf("setSlice: got emtpy slice")
}
slice := reflect.MakeSlice(t, size, size)
switch t.Elem().Kind() {
case reflect.String:
for i := 0; i < size; i++ {
slice.Index(i).SetString(items[i])
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
for i := 0; i < size; i++ {
val, _ := strconv.ParseInt(items[i], 10, 64)
slice.Index(i).SetInt(val)
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
for i := 0; i < size; i++ {
val, _ := strconv.ParseUint(items[i], 10, 64)
slice.Index(i).SetUint(val)
}
case reflect.Float32, reflect.Float64:
for i := 0; i < size; i++ {
val, _ := strconv.ParseFloat(items[i], 64)
slice.Index(i).SetFloat(val)
}
case reflect.Bool:
for i := 0; i < size; i++ {
val, _ := strconv.ParseBool(items[i])
slice.Index(i).SetBool(val)
}
default:
return fmt.Errorf("setSlice: unsupported type of slice item: %v", t.Elem().Kind().String())
}
v.Set(slice)
return nil
}
func setPtrValue(t reflect.Type, v reflect.Value, val string) (err error) {
switch t.Elem().Name() {
case reflect.Int.String(): // doesn't care about 32bit systems
if i64, err := strconv.ParseInt(val, 10, 64); err == nil {
i := int(i64)
v.Set(reflect.ValueOf(&i))
}
case reflect.Int8.String():
if i64, err := strconv.ParseInt(val, 10, 8); err == nil {
i8 := int8(i64)
v.Set(reflect.ValueOf(&i8))
}
case reflect.Int16.String():
if i64, err := strconv.ParseInt(val, 10, 16); err == nil {
i16 := int16(i64)
v.Set(reflect.ValueOf(&i16))
}
case reflect.Int32.String():
if i64, err := strconv.ParseInt(val, 10, 32); err == nil {
i32 := int32(i64)
v.Set(reflect.ValueOf(&i32))
}
case reflect.Int64.String():
if i64, err := strconv.ParseInt(val, 10, 64); err == nil {
v.Set(reflect.ValueOf(&i64))
}
case reflect.Uint.String(): // doesn't care about 32bit systems
if ui64, err := strconv.ParseUint(val, 10, 64); err == nil {
ui := uint(ui64)
v.Set(reflect.ValueOf(&ui))
}
case reflect.Uint8.String():
if ui64, err := strconv.ParseUint(val, 10, 8); err == nil {
ui8 := uint8(ui64)
v.Set(reflect.ValueOf(&ui8))
}
case reflect.Uint16.String():
if ui64, err := strconv.ParseUint(val, 10, 16); err == nil {
ui16 := uint16(ui64)
v.Set(reflect.ValueOf(&ui16))
}
case reflect.Uint32.String():
if ui64, err := strconv.ParseUint(val, 10, 32); err == nil {
ui32 := uint32(ui64)
v.Set(reflect.ValueOf(&ui32))
}
case reflect.Uint64.String():
if ui64, err := strconv.ParseUint(val, 10, 64); err == nil {
v.Set(reflect.ValueOf(&ui64))
}
case reflect.Float32.String():
if f64, err := strconv.ParseFloat(val, 32); err == nil {
f32 := float32(f64)
v.Set(reflect.ValueOf(&f32))
}
case reflect.Float64.String():
if f64, err := strconv.ParseFloat(val, 64); err == nil {
v.Set(reflect.ValueOf(&f64))
}
case reflect.String.String():
if len(val) > 0 {
v.Set(reflect.ValueOf(&val))
}
case reflect.Bool.String():
if b, err := strconv.ParseBool(val); err == nil {
v.Set(reflect.ValueOf(&b))
}
default:
err = fmt.Errorf("setPtrValue: unsupported type: %v", t.Kind().String())
}
return
}