func()

in pkg/options/types.go [178:237]

• 55 lines of code
• 18 McCabe index (conditional complexity)

func (l *LabelsAllowList) Set(value string) error {
	// Taken from text/scanner EOF constant.
	const EOF = -1
	var (
		m            = make(map[string][]string, len(*l))
		previous     rune
		next         rune
		firstWordPos int
		name         string
	)
	firstWordPos = 0

	for i, v := range value {
		if i+1 == len(value) {
			next = EOF
		} else {
			next = []rune(value)[i+1]
		}
		if i-1 >= 0 {
			previous = []rune(value)[i-1]
		} else {
			previous = v
		}

		switch v {
		case '=':
			if previous == ',' || next != '[' {
				return errLabelsAllowListFormat
			}
			name = strings.TrimSpace(string(([]rune(value)[firstWordPos:i])))
			m[name] = []string{}
			firstWordPos = i + 1
		case '[':
			if previous != '=' {
				return errLabelsAllowListFormat
			}
			firstWordPos = i + 1
		case ']':
			// if after metric group, has char not comma or end.
			if next != EOF && next != ',' {
				return errLabelsAllowListFormat
			}
			if previous != '[' {
				m[name] = append(m[name], strings.TrimSpace(string(([]rune(value)[firstWordPos:i]))))
			}
			firstWordPos = i + 1
		case ',':
			// if starts or ends with comma
			if previous == v || next == EOF || next == ']' {
				return errLabelsAllowListFormat
			}
			if previous != ']' {
				m[name] = append(m[name], strings.TrimSpace(string(([]rune(value)[firstWordPos:i]))))
			}
			firstWordPos = i + 1
		}
	}
	*l = m
	return nil
}