Method decodeSlice

mapstructure.go:1078–1153

(name string, data interface{}, val reflect.Value)

}

func (d *Decoder) decodeSlice(name string, data interface{}, val reflect.Value) error {
	dataVal := reflect.Indirect(reflect.ValueOf(data))
	dataValKind := dataVal.Kind()
	valType := val.Type()
	valElemType := valType.Elem()
	sliceType := reflect.SliceOf(valElemType)

	// If we have a non array/slice type then we first attempt to convert.
	if dataValKind != reflect.Array && dataValKind != reflect.Slice {
		if d.config.WeaklyTypedInput {
			switch {
			// Slice and array we use the normal logic
			case dataValKind == reflect.Slice, dataValKind == reflect.Array:
				break

			// Empty maps turn into empty slices
			case dataValKind == reflect.Map:
				if dataVal.Len() == 0 {
					val.Set(reflect.MakeSlice(sliceType, 0, 0))
					return nil
				}
				// Create slice of maps of other sizes
				return d.decodeSlice(name, []interface{}{data}, val)

			case dataValKind == reflect.String && valElemType.Kind() == reflect.Uint8:
				return d.decodeSlice(name, []byte(dataVal.String()), val)

			// All other types we try to convert to the slice type
			// and "lift" it into it. i.e. a string becomes a string slice.
			default:
				// Just re-try this function with data as a slice.
				return d.decodeSlice(name, []interface{}{data}, val)
			}
		}

		return fmt.Errorf(
			"'%s': source data must be an array or slice, got %s", name, dataValKind)
	}

	// If the input value is nil, then don't allocate since empty != nil
	if dataValKind != reflect.Array && dataVal.IsNil() {
		return nil
	}

	valSlice := val
	if valSlice.IsNil() || d.config.ZeroFields {
		// Make a new slice to hold our result, same size as the original data.
		valSlice = reflect.MakeSlice(sliceType, dataVal.Len(), dataVal.Len())
	}

	// Accumulate any errors
	errors := make([]string, 0)

	for i := 0; i < dataVal.Len(); i++ {
		currentData := dataVal.Index(i).Interface()
		for valSlice.Len() <= i {
			valSlice = reflect.Append(valSlice, reflect.Zero(valElemType))
		}