%YAML 1.2
---
name: Octo
scope: source.octo
file_extensions: [8o]

contexts:
  main:
    # Single line comments
    - scope: comment.line.number-sign.octo
      match: \#.*

    # Data registers
    - scope: variable.language.vreg.octo
      match: (?<=^|\s)(?i:v\h)(?=$|\s)

    # Address register
    - scope: variable.language.ireg.octo
      match: (?<=^|\s)i(?=$|\s)

    # Assignment operators
    - scope: keyword.operator.assignment.octo
      match: (?<=^|\s)(?:\:=|\+=|\-=|=\-|\|=|&=|\^=|<<=|>>=)(?=$|\s)

    # Comparison operators
    - scope: keyword.operator.comparison.octo
      match: (?<=^|\s)(?:==|!=)(?=$|\s)

    # Relational operators
    - scope: keyword.operator.relational.octo
      match: (?<=^|\s)(?:<=|>=|<|>)(?=$|\s)

    # Control flow keywords
    - scope: keyword.control.octo
      match: (?<=^|\s)(?:return|if|then|begin|else|end|loop|again|while|jump|jump0|\:call|\;)(?=$|\s)

    # alias and const directives
    - scope: storage.type.octo
      match: (?<=^|\s)(?:\:alias|\:const)(?=$|\s)

    # Self-modifying code commands
    - scope: support.function.octo
      match: (?<=^|\s)(?:\:unpack|\:next|\:org)(?=$|\s)

    # Metaprogramming commands
    - scope: support.function.octo
      match: (?<=^|\s)(?:\:macro|\:calc|\:byte|\:pointer|\:stringmode)(?=$|\s)

    # Breakpoint command
    - scope: support.function.octo
      match: (?<=^|\s)(?:\:breakpoint)(?=$|\s)

    # Assertion command
    - scope: support.function.octo
      match: (?<=^|\s)(?:\:assert)(?=$|\s)

    # Memory monitor command
    - scope: support.function.octo
      match: (?<=^|\s)(?:\:monitor)(?=$|\s)

    # Deprecated commands
    - scope: invalid.deprecated.octo
      match: (?<=^|\s)(\:proto)(?=$|\s)

    # Statement keywords (standard)
    - scope: keyword.other.octo
      match: (?<=^|\s)(?:clear|bcd|save|load|sprite|hex|random|delay|pitch|key|-key|buzzer|native)(?=$|\s)

    # Statement keywords (SCHIP)
    - scope: keyword.other.octo
      match: (?<=^|\s)(?:hires|lores|scroll-down|scroll-left|scroll-right|bighex|exit|saveflags|loadflags)(?=$|\s)

    # Statement keywords (XO-Chip)
    - scope: keyword.other.octo
      match: (?<=^|\s)(?:long|plane|audio|scroll-up)(?=$|\s)

    # Binary numbers
    - scope: constant.numeric.binary.octo
      match: (?<=^|\s)[+\-]?0b[01]+(?=$|\s)

    # Hexadecimal numbers
    - scope: constant.numeric.hexadecimal.octo
      match: (?<=^|\s)[+\-]?0x\h+(?=$|\s)

    # Decimal numbers
    - scope: constant.numeric.decimal.octo
      match: (?<=^|\s)[+\-]?\d+(?=$|\s)

    # Subroutine scopes
    - scope: entity.name.function.octo
      match: (?<=^|\s):\s+\S+(?=$|\s)

    - match: '"'
      push: string

  string:
      - meta_scope: string.quoted.double.octo
      - match: \\[tnrv0\\"]
        scope: constant.character.escape.octo
      - match: '"'
        pop: true