func()

in util/jsonpath/jsonpath.go [290:344]

• 51 lines of code
• 20 McCabe index (conditional complexity)

func (j *JSONPath) evalArray(input []reflect.Value, node *ArrayNode) ([]reflect.Value, error) {
	result := []reflect.Value{}
	for _, value := range input {

		value, isNil := template.Indirect(value)
		if isNil {
			continue
		}
		if value.Kind() != reflect.Array && value.Kind() != reflect.Slice {
			return input, fmt.Errorf("%v is not array or slice", value.Type())
		}
		params := node.Params
		if !params[0].Known {
			params[0].Value = 0
		}
		if params[0].Value < 0 {
			params[0].Value += value.Len()
		}
		if !params[1].Known {
			params[1].Value = value.Len()
		}

		if params[1].Value < 0 || (params[1].Value == 0 && params[1].Derived) {
			params[1].Value += value.Len()
		}
		sliceLength := value.Len()
		if params[1].Value != params[0].Value { // if you're requesting zero elements, allow it through.
			if params[0].Value >= sliceLength || params[0].Value < 0 {
				return input, fmt.Errorf("array index out of bounds: index %d, length %d", params[0].Value, sliceLength)
			}
			if params[1].Value > sliceLength || params[1].Value < 0 {
				return input, fmt.Errorf("array index out of bounds: index %d, length %d", params[1].Value-1, sliceLength)
			}
			if params[0].Value > params[1].Value {
				return input, fmt.Errorf("starting index %d is greater than ending index %d", params[0].Value, params[1].Value)
			}
		} else {
			return result, nil
		}

		value = value.Slice(params[0].Value, params[1].Value)

		step := 1
		if params[2].Known {
			if params[2].Value <= 0 {
				return input, fmt.Errorf("step must be > 0")
			}
			step = params[2].Value
		}
		for i := 0; i < value.Len(); i += step {
			result = append(result, value.Index(i))
		}
	}
	return result, nil
}