Method decodeStructFromMap

mapstructure.go:1265–1482

(name string, dataVal, val reflect.Value)

}

func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) error {
	dataValType := dataVal.Type()
	if kind := dataValType.Key().Kind(); kind != reflect.String && kind != reflect.Interface {
		return fmt.Errorf(
			"'%s' needs a map with string keys, has '%s' keys",
			name, dataValType.Key().Kind())
	}

	dataValKeys := make(map[reflect.Value]struct{})
	dataValKeysUnused := make(map[interface{}]struct{})
	for _, dataValKey := range dataVal.MapKeys() {
		dataValKeys[dataValKey] = struct{}{}
		dataValKeysUnused[dataValKey.Interface()] = struct{}{}
	}

	targetValKeysUnused := make(map[interface{}]struct{})
	errors := make([]string, 0)

	// This slice will keep track of all the structs we'll be decoding.
	// There can be more than one struct if there are embedded structs
	// that are squashed.
	structs := make([]reflect.Value, 1, 5)
	structs[0] = val

	// Compile the list of all the fields that we're going to be decoding
	// from all the structs.
	type field struct {
		field reflect.StructField
		val   reflect.Value
	}

	// remainField is set to a valid field set with the "remain" tag if
	// we are keeping track of remaining values.
	var remainField *field

	fields := []field{}
	for len(structs) > 0 {
		structVal := structs[0]
		structs = structs[1:]

		structType := structVal.Type()

		for i := 0; i < structType.NumField(); i++ {
			fieldType := structType.Field(i)
			fieldVal := structVal.Field(i)
			if fieldVal.Kind() == reflect.Ptr && fieldVal.Elem().Kind() == reflect.Struct {
				// Handle embedded struct pointers as embedded structs.
				fieldVal = fieldVal.Elem()
			}

			// If "squash" is specified in the tag, we squash the field down.
			squash := d.config.Squash && fieldVal.Kind() == reflect.Struct && fieldType.Anonymous
			remain := false

			// We always parse the tags cause we're looking for other tags too
			tagParts := strings.Split(fieldType.Tag.Get(d.config.TagName), ",")
			for _, tag := range tagParts[1:] {
				if tag == "squash" {