func()

in util/jsonpath/jsonpath.go [497:568]

• 65 lines of code
• 21 McCabe index (conditional complexity)

func (j *JSONPath) evalFilter(input []reflect.Value, node *FilterNode) ([]reflect.Value, error) {
	results := []reflect.Value{}
	for _, value := range input {
		value, _ = template.Indirect(value)

		if value.Kind() != reflect.Array && value.Kind() != reflect.Slice {
			return input, fmt.Errorf("%v is not array or slice and cannot be filtered", value)
		}
		for i := 0; i < value.Len(); i++ {
			temp := []reflect.Value{value.Index(i)}
			lefts, err := j.evalList(temp, node.Left)

			//case exists
			if node.Operator == "exists" {
				if len(lefts) > 0 {
					results = append(results, value.Index(i))
				}
				continue
			}

			if err != nil {
				return input, err
			}

			var left, right interface{}
			switch {
			case len(lefts) == 0:
				continue
			case len(lefts) > 1:
				return input, fmt.Errorf("can only compare one element at a time")
			}
			left = lefts[0].Interface()

			rights, err := j.evalList(temp, node.Right)
			if err != nil {
				return input, err
			}
			switch {
			case len(rights) == 0:
				continue
			case len(rights) > 1:
				return input, fmt.Errorf("can only compare one element at a time")
			}
			right = rights[0].Interface()

			pass := false
			switch node.Operator {
			case "<":
				pass, err = template.Less(left, right)
			case ">":
				pass, err = template.Greater(left, right)
			case "==":
				pass, err = template.Equal(left, right)
			case "!=":
				pass, err = template.NotEqual(left, right)
			case "<=":
				pass, err = template.LessEqual(left, right)
			case ">=":
				pass, err = template.GreaterEqual(left, right)
			default:
				return results, fmt.Errorf("unrecognized filter operator %s", node.Operator)
			}
			if err != nil {
				return results, err
			}
			if pass {
				results = append(results, value.Index(i))
			}
		}
	}
	return results, nil
}