%YAML 1.2
---
name: S-C Assembler
file_extensions: []
scope: source.asm.sc-asm

variables:
  ws: '[ \t]+'
  xws: '[ \t\x08]*'
  ident: '[A-Za-z][A-Za-z0-9.]*'
  lident: '.[0-9]{1,2}'

contexts:
  prototype:
    - include: eol
  main:

    - meta_include_prototype: false

    - match: ^[*]
      push:
        - meta_scope: comment.line
        - match: \n
          pop: true


      # assembler commands. there are others but these are used by a2osx...
    - match: '^{{xws}}((?i)NEW|AUTO|MANUAL|MAN|ASM)\b'
      captures:
        1: keyword.directive
      # scope: keyword.directive
      push:
        - match: $
          pop: true

    - match: '^{{xws}}((?i)SAVE|LOAD)\b'
      captures:
        1: keyword.directive
      # scope: keyword.directive
      push: operand-path




    - match: '{{ws}}'
      push: opcode

    - match: '^{{ws}}((?i)\.MA)\s({{ident}})'
      captures:
        2: keyword.directive
        1: entity.name.function
      push: eol


    - match: '^({{ident}}){{ws}}\.((?i)EQ)\b'
      captures:
        1: entity.name.constant
        2: keyword.directive
      push: operand

    - match: '^{{lident}}'
      scope: entity.name.label.local


    - match: '^{{ident}}'
      scope: entity.name.function


  opcode:
    - match: '{{ws}}'
      set: operand
    - include: scope:source.asm.65816#mnemonics-6502
    - include: scope:source.asm.65816#mnemonics-65c02
    - include: scope:source.asm.65816#mnemonics-65c02s
    - include: scope:source.asm.65816#mnemonics-65816
    - include: mnemonics-6502-alt


    - match: \.(?i:DA)\b
      scope: keyword.directive.data
      set: operand

    - match: \.(?i:HS)\b
      scope: keyword.directive.data
      set: operand-hex

    - match: \.(?i:AS|AT|AZ)\b
      scope: keyword.directive.data
      set: operand-string

    - match: \.(?i:OP)\b
      scope: keyword.directive
      set: operand-op


    - match: \.(?i:INB|IN|TF)\b
      scope: keyword.control.import
      set: operand-path


    - match: \.(?i:LIST)\b
      scope: keyword.directive
      set: operand-list
    

    - match: \.(?i:AC|AS|AT|AZ|BS|DA|DO|DUMMY|ED|ELSE|EM|EN|EP|EQ|FIN|HS|IN|INB|LIST|MA|OP|OR|PG|PH|TA|TF|TI|US)\b
      scope: keyword.directive



    - match: '>{{ident}}'
      scope: variable.function.macro
      set: operand



  operand:
    - include: numbers
    - include: strings
    - match: ']\d+'
      scope: variable.other
    #- include: macro-parm 



  operand-op:
    - match: '(?i:6502|SW16|65C02|65R02|65802|65816)'
      scope: constant.language
      set: comment
    - include: error

  operand-hex:
    - match: '[0-9A-Fa-f]{2}'
      scope: constant.numeric.hex
    - include: expect-comment


  operand-path:
    - match: \S+
      scope: string.unquoted
      set: expect-comment
    - include: expect-comment

  # -? delimiter (anything but delimiter)* delimiter
  # pop: 1 needed for \1 backref matching.
  operand-string:

    - match: '-?([^ \t-])'
      scope: punctuation.definition.string.begin
      push: [comment, operand-string-inner]

    # - include: expect-comment

  operand-string-inner:
    - meta_scope: string.quoted
    - match: \1
      scope: punctuation.definition.string.end
      pop: true


  operand-list:
      # .LIST ON | OFF | CON | COFF | MON | MOFF | XON | XOFF
    - match: \b(?i:[CMX]?ON|[CMX]?OFF)\b
      scope: constant.language
      set: comment

    - include: error



  error:
    - match: \S
      scope: invalid.illegal.expect.comment


  expect-comment:
    - include: comment
    - match: \S
      scope: invalid.illegal.expect.comment

  comment:
    - match: (?<=[\t ])
      push:
        - meta_scope: comment.line
        - match: \n
          pop: true
    - include: eol


  mnemonics-6502-alt:
    - match: \b(?i:BLT|BGE)\b
      scope: keyword.mnemonic.6502.alt

  numbers:
    - match: \b\d+\b
      scope: constant.numeric
    - match: \$[0-9a-fA-F]+\b
      scope: constant.numeric.hex
    - match: \%[01_]+\b
      scope: constant.numeric.binary

  strings:

    - match: "'"
      scope: punctuation.definition.string.begin
      push:
        - meta_include_prototype: false
        - meta_scope: string.quoted.single
        - match: "'"
          scope: punctuation.definition.string.end
          pop: true
        - match: \n
          scope: invalid.illegal.newline.asm
          pop: true


  eol:
    - match: '$'
      pop: true