def next()

in rsc/src/main/scala/rsc/scan/java/Scanner.scala [18:100]
83 lines of code
28 McCabe index (conditional complexity)

  def next(): Unit = {
    (ch: @switch) match {
      case SU =>
        start = end
        token = EOF
        value = null
      case '/' =>
        if (ch1 == '/' || ch1 == '*') comment()
        else operator()
      case ' ' | '\t' =>
        whitespace()
      case CR | LF | FF =>
        newline()
      case 'A' | 'B' | 'C' | 'D' | 'E' | 'F' | 'G' | 'H' | 'I' | 'J' | 'K' | 'L' | 'M' | 'N' | 'O' |
          'P' | 'Q' | 'R' | 'S' | 'T' | 'U' | 'V' | 'W' | 'X' | 'Y' | 'Z' | '$' | '_' | 'a' | 'b' |
          'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' | 'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' |
          'r' | 's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z' =>
        idOrKeyword()
      case '=' | '>' | '<' | '!' | '~' | '&' | '|' | '+' | '-' | '*' | '^' | '%' =>
        operator()
      case '?' =>
        nextChar()
        emit(QMARK, null)
      case ':' =>
        nextChar()
        emit(COLON, null)
      case '@' =>
        nextChar()
        emit(AT, null)
      case '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' =>
        number()
      case '"' =>
        string()
      case '\'' =>
        character()
      case '.' =>
        if (isDecimalDigit(ch1)) {
          number()
        } else {
          nextChar()
          if (ch == '.') {
            nextChar()
            if (ch == '.') {
              nextChar()
              emit(DOTDOTDOT, null)
            } else {
              val message = reportOffset(start, IllegalEllipsis)
              emit(ERROR, message.str)
            }
          } else {
            emit(DOT, null)
          }
        }
      case ';' =>
        nextChar()
        emit(SEMI, null)
      case ',' =>
        nextChar()
        emit(COMMA, null)
      case '(' =>
        nextChar()
        emit(LPAREN, null)
      case '{' =>
        nextChar()
        emit(LBRACE, null)
      case ')' =>
        nextChar()
        emit(RPAREN, null)
      case '}' =>
        nextChar()
        emit(RBRACE, null)
      case '[' =>
        nextChar()
        emit(LBRACKET, null)
      case ']' =>
        nextChar()
        emit(RBRACKET, null)
      case other =>
        val message = reportOffset(offset, IllegalCharacter)
        emit(ERROR, message.str)
        nextChar()
    }
  }