smsd.yug

meta:
  id: smsd
  title: SMSD command
  license: Unlicense
  class: regular
doc: A grammar for SMSD text serial commands
tests:
  - model: lines
    files:
      - "tests.txt"

chars:
  - id: digit
    wellknown: digits
  - id: plus
    lit: +
  - id: minus
    lit: '-'
  - id: sign
    alt:
      - ref: plus
      - ref: minus
keywords:
  - id: optional_arg_verb
    alt:
      - lit: LD
      - lit: MV
      - lit: ST
      - lit: PS
  - id: no_arg_verb
    alt:
      - lit: BG
      - lit: EN
      - lit: DL
      - lit: DR
      - lit: RS
      - lit: EN
      - lit: DS
      - lit: ON
      - lit: OF
      - lit: SF
      - lit: WL
      - lit: WH
      - lit: CF
      - lit: LL
      - lit: ED
  - id: unsigned_arg_verb
    alt:
      - lit: SD
      - lit: SS
      - lit: SP
      - lit: JP
  - id: signed_arg_verb
    lit: AL
tokens:
  - id: unsigned_number
    ref: digit
    min: 1
  - id: signed_number
    seq:
      - opt:
          ref: sign
      - ref: unsigned_number

prods:
  - id: command
    alt:
      - ref: opt_arg_command
      - ref: unsigned_command
      - ref: signed_command

  - id: signed_command
    seq:
      - ref: signed_arg_verb
        cap: verb
      - ref: signed_number
        cap: arg
  - id: unsigned_command
    seq:
      - ref: unsigned_arg_verb
        cap: verb
      - ref: unsigned_number
        cap: arg
  - id: opt_arg
    opt:
      ref: unsigned_number
  - id: opt_arg_command
    seq:
      - ref: optional_arg_verb
        cap: verb
      - ref: opt_arg
        cap: arg