func EscapeArg()

in windows/exec_windows.go [23:79]

• 56 lines of code
• 14 McCabe index (conditional complexity)

func EscapeArg(s string) string {
	if len(s) == 0 {
		return "\"\""
	}
	n := len(s)
	hasSpace := false
	for i := 0; i < len(s); i++ {
		switch s[i] {
		case '"', '\\':
			n++
		case ' ', '\t':
			hasSpace = true
		}
	}
	if hasSpace {
		n += 2
	}
	if n == len(s) {
		return s
	}

	qs := make([]byte, n)
	j := 0
	if hasSpace {
		qs[j] = '"'
		j++
	}
	slashes := 0
	for i := 0; i < len(s); i++ {
		switch s[i] {
		default:
			slashes = 0
			qs[j] = s[i]
		case '\\':
			slashes++
			qs[j] = s[i]
		case '"':
			for ; slashes > 0; slashes-- {
				qs[j] = '\\'
				j++
			}
			qs[j] = '\\'
			j++
			qs[j] = s[i]
		}
		j++
	}
	if hasSpace {
		for ; slashes > 0; slashes-- {
			qs[j] = '\\'
			j++
		}
		qs[j] = '"'
		j++
	}
	return string(qs[:j])
}