155 lines
3.7 KiB
Go
155 lines
3.7 KiB
Go
package mapstructure
|
|
|
|
import (
|
|
"errors"
|
|
"reflect"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
// typedDecodeHook takes a raw DecodeHookFunc (an interface{}) and turns
|
|
// it into the proper DecodeHookFunc type, such as DecodeHookFuncType.
|
|
func typedDecodeHook(h DecodeHookFunc) DecodeHookFunc {
|
|
// Create variables here so we can reference them with the reflect pkg
|
|
var f1 DecodeHookFuncType
|
|
var f2 DecodeHookFuncKind
|
|
|
|
// Fill in the variables into this interface and the rest is done
|
|
// automatically using the reflect package.
|
|
potential := []interface{}{f1, f2}
|
|
|
|
v := reflect.ValueOf(h)
|
|
vt := v.Type()
|
|
for _, raw := range potential {
|
|
pt := reflect.ValueOf(raw).Type()
|
|
if vt.ConvertibleTo(pt) {
|
|
return v.Convert(pt).Interface()
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// DecodeHookExec executes the given decode hook. This should be used
|
|
// since it'll naturally degrade to the older backwards compatible DecodeHookFunc
|
|
// that took reflect.Kind instead of reflect.Type.
|
|
func DecodeHookExec(
|
|
raw DecodeHookFunc,
|
|
from reflect.Type, to reflect.Type,
|
|
data interface{}) (interface{}, error) {
|
|
// Build our arguments that reflect expects
|
|
argVals := make([]reflect.Value, 3)
|
|
argVals[0] = reflect.ValueOf(from)
|
|
argVals[1] = reflect.ValueOf(to)
|
|
argVals[2] = reflect.ValueOf(data)
|
|
|
|
switch f := typedDecodeHook(raw).(type) {
|
|
case DecodeHookFuncType:
|
|
return f(from, to, data)
|
|
case DecodeHookFuncKind:
|
|
return f(from.Kind(), to.Kind(), data)
|
|
default:
|
|
return nil, errors.New("invalid decode hook signature")
|
|
}
|
|
}
|
|
|
|
// ComposeDecodeHookFunc creates a single DecodeHookFunc that
|
|
// automatically composes multiple DecodeHookFuncs.
|
|
//
|
|
// The composed funcs are called in order, with the result of the
|
|
// previous transformation.
|
|
func ComposeDecodeHookFunc(fs ...DecodeHookFunc) DecodeHookFunc {
|
|
return func(
|
|
f reflect.Type,
|
|
t reflect.Type,
|
|
data interface{}) (interface{}, error) {
|
|
var err error
|
|
for _, f1 := range fs {
|
|
data, err = DecodeHookExec(f1, f, t, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Modify the from kind to be correct with the new data
|
|
f = nil
|
|
if val := reflect.ValueOf(data); val.IsValid() {
|
|
f = val.Type()
|
|
}
|
|
}
|
|
|
|
return data, nil
|
|
}
|
|
}
|
|
|
|
// StringToSliceHookFunc returns a DecodeHookFunc that converts
|
|
// string to []string by splitting on the given sep.
|
|
func StringToSliceHookFunc(sep string) DecodeHookFunc {
|
|
return func(
|
|
f reflect.Kind,
|
|
t reflect.Kind,
|
|
data interface{}) (interface{}, error) {
|
|
if f != reflect.String || t != reflect.Slice {
|
|
return data, nil
|
|
}
|
|
|
|
raw := data.(string)
|
|
if raw == "" {
|
|
return []string{}, nil
|
|
}
|
|
|
|
return strings.Split(raw, sep), nil
|
|
}
|
|
}
|
|
|
|
// StringToTimeDurationHookFunc returns a DecodeHookFunc that converts
|
|
// strings to time.Duration.
|
|
func StringToTimeDurationHookFunc() DecodeHookFunc {
|
|
return func(
|
|
f reflect.Type,
|
|
t reflect.Type,
|
|
data interface{}) (interface{}, error) {
|
|
if f.Kind() != reflect.String {
|
|
return data, nil
|
|
}
|
|
if t != reflect.TypeOf(time.Duration(5)) {
|
|
return data, nil
|
|
}
|
|
|
|
// Convert it by parsing
|
|
return time.ParseDuration(data.(string))
|
|
}
|
|
}
|
|
|
|
func WeaklyTypedHook(
|
|
f reflect.Kind,
|
|
t reflect.Kind,
|
|
data interface{}) (interface{}, error) {
|
|
dataVal := reflect.ValueOf(data)
|
|
switch t {
|
|
case reflect.String:
|
|
switch f {
|
|
case reflect.Bool:
|
|
if dataVal.Bool() {
|
|
return "1", nil
|
|
} else {
|
|
return "0", nil
|
|
}
|
|
case reflect.Float32:
|
|
return strconv.FormatFloat(dataVal.Float(), 'f', -1, 64), nil
|
|
case reflect.Int:
|
|
return strconv.FormatInt(dataVal.Int(), 10), nil
|
|
case reflect.Slice:
|
|
dataType := dataVal.Type()
|
|
elemKind := dataType.Elem().Kind()
|
|
if elemKind == reflect.Uint8 {
|
|
return string(dataVal.Interface().([]uint8)), nil
|
|
}
|
|
case reflect.Uint:
|
|
return strconv.FormatUint(dataVal.Uint(), 10), nil
|
|
}
|
|
}
|
|
|
|
return data, nil
|
|
}
|