func Compute()

in leaphash/leaphash.go [32:76]

• 32 lines of code
• 10 McCabe index (conditional complexity)

func Compute(data string) string {
	lines := strings.Split(string(data), "\n")

	var filtered string
	filterBlanks := func(r rune) rune {
		if r == ' ' || r == '\t' {
			return -1
		}
		return r
	}

	for i := 0; i < len(lines); i++ {
		if strings.HasPrefix(lines[i], "#$") || strings.HasPrefix(lines[i], "#@") {
			// "#$" - last modification time
			// "#@" - the expiration time of the file
			filtered += strings.Map(filterBlanks, lines[i][2:len(lines[i])])
		} else if strings.HasPrefix(lines[i], "#") {
			// comment
		} else {
			// leap second lines, without comments and without any blank characters
			line := lines[i]

			commentPos := strings.Index(line, "#")
			if commentPos != -1 {
				line = line[0 : commentPos-1]
			}

			filtered += strings.Map(filterBlanks, line)
		}
	}

	// checksum
	hash := fmt.Sprintf("%x", sha1.Sum([]byte(filtered)))

	var groupedHash string
	// group checksum by 8 characters
	for i := 0; i < 5; i++ {
		if groupedHash != "" {
			groupedHash += " "
		}
		groupedHash += hash[i*8 : (i+1)*8]
	}

	return groupedHash
}