fn unescape()

in src/tokenizer.rs [2206:2244]

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

    fn unescape(mut self) -> Option<String> {
        let mut unescaped = String::new();

        self.chars.next();

        while let Some(c) = self.chars.next() {
            if c == '\'' {
                // case: ''''
                if self.chars.peek().map(|c| *c == '\'').unwrap_or(false) {
                    self.chars.next();
                    unescaped.push('\'');
                    continue;
                }
                return Some(unescaped);
            }

            if c != '\\' {
                unescaped.push(c);
                continue;
            }

            let c = match self.chars.next()? {
                'b' => '\u{0008}',
                'f' => '\u{000C}',
                'n' => '\n',
                'r' => '\r',
                't' => '\t',
                'u' => self.unescape_unicode_16()?,
                'U' => self.unescape_unicode_32()?,
                'x' => self.unescape_hex()?,
                c if c.is_digit(8) => self.unescape_octal(c)?,
                c => c,
            };

            unescaped.push(Self::check_null(c)?);
        }

        None
    }