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