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state=A
while true; do
  case $state in
    A)
    if test "$1" != -A; then
      echo Expected -A
      break
    fi
    if test -z "$2"; then
      echo Expected -A argument
      break
    fi
    echo Section A, argument: "$2"
    state=B
    shift 2
    ;;

    B)
    if test "$1" != -B; then 
      echo Expected -B
      break
    fi
    if test -z "$2"; then 
      echo Expected -B argument
      break
    fi
    echo Section B, argument: "$2"
    state=Barg
    shift 2
    ;;

    Barg)
    case "$1" in
      -a)
      if test -z "$2"; then 
        echo Expected -a argument
        break
      fi
      echo Section B, argument -a: "$2"
      shift 2
      ;;

      -b)
      if test -z "$2"; then 
        echo Expected -b argument
        break
      fi
      echo Section B, argument -b: "$2"
      shift 2
      ;;

      -c)
      if test -z "$2"; then 
        echo Expected -c argument
        break
      fi
      echo Section B, argument -c: "$2"
      shift 2
      ;;

      *)
      state=C
      ;;
    esac
    ;;

    C)
    case "$1" in
      -C)
      if test -z "$2"; then 
        echo Expected -C argument
        break
      fi
      echo Section C, argument: "$2"
      state=Carg
      shift 2
      ;;

      *)
      state=D
      ;;
    esac
    ;;

    Carg)
    case "$1" in
      -a)
      if test -z "$2"; then 
        echo Expected -a argument
        break
      fi
      echo Section B, argument -a: "$2"
      shift 2
      ;;

      -d)
      if test -z "$2" -o -z "$3" -o -z "$4"; then
        echo Expected three -d arguments
        break
      fi
      echo Section C, argument -d: "$2"
      echo Section C, argument -d: "$3"
      echo Section C, argument -d: "$3"
      shift 4
      ;;

      -c)
      if test -z "$2"; then 
        echo Expected -c argument
        break
      fi
      echo Section C, argument -c: "$2"
      shift 2
      ;;

      *)
      state=D
      ;;
    esac
    ;;

    D)
    if test "$1" != -D; then 
      echo Expected -D
      break
    fi
    if test -n "$2"; then
      echo Section D, argument: "$2"
      shift 2
    else
      echo Section D, no argument
      shift
    fi
    state=End
    ;;

    End)
    break
    ;;

    *)
    echo Internal error, state=$state
    break
    ;;
  esac
done

if test "$state" != End; then
  echo Parsing failed in state $state
fi