Stuck at backslash outside quotes for test cases like cat "/tmp/fox/f\\n92"

Challenges
1

I’m stuck on Stage Backslash outside quotes #YT5
My go code:

func sanitiseArgs(argumentString string) []string {

	arguments := make([]string, 0)
	chars := make([]rune, 0)
	squote := false
	dquote := false
	escape := false

	for _, r := range argumentString {

		// the character right after the escape char need to be added
		if escape {
			escape = false // since the escape character isn't a pair we need to make it false explicitly
			chars = append(chars, r)
			continue
		}

		switch r {
		case '\n':
		case ' ':
			if squote || dquote {
				chars = append(chars, r)
			} else {
				if len(chars) > 0 {
					arguments = append(arguments, string(chars))
					chars = chars[:0]
				}
			}
		case '\'':
			if !dquote {
				squote = !squote
			} else {
				chars = append(chars, r)
			}
		case '"':
			if !squote {
				dquote = !dquote
			} else {
				chars = append(chars, r)
			}
		case '\\':
			escape = true
		default:
			chars = append(chars, r)
		}
	}

	if len(chars) > 0 {
		arguments = append(arguments, string(chars))

	}
	return arguments
}

What’s failing:

image
image876×500 74.6 KB

I tried to run debugger with strings like "/tmp/fox/f\\n92" and I found out that after /tmp/fox/f it runs case: '\\' makes escape=true then in the next iteration the variable r in the for loop gets n rune instead of the second \. I am very confused at this point. What is it that I don’t know about the GO language which is causing this?

TIA

4

Found the solution, I just had to check whether dquote or squote was true in the case of /, if yes then add the rune else escape the rune/character

		case '\\':
			if !(squote || dquote) {
				escape = true
			} else {
				chars = append(chars, r)
			}
1 Like