filetype: B

detect:
    filename: '\.b$'
    # core control words + storage classes (Thompson B-ish)
    signature: '\b(if|else|while|switch|case|default|break|return|goto|extrn|auto)\b'

rules:
    # -------------------------
    # Comments (B: /* ... */)
    # -------------------------
    - comment:
        start: '/\*'
        end: '\*/'
        rules: []

    # Optional: // line comments (convenient, not “original” B)
    - comment:
        start: '//'
        end: '$'
        rules: []

    # -------------------------
    # Strings + escapes
    # -------------------------
    - constant.string:
        start: '"'
        end: '"'
        skip: '\\\\.'
        rules:
            # common escapes: \n \t \e \r \0 \" \\ \( \) \*
            - constant.specialChar: '\\\\([0netr"\\\\\\*\\(\\)])'
            # printf-ish: %s %c %d %o and %%
            - constant.specialChar: '%(%|[scdo])'

    - constant.string:
        start: "'"
        end: "'"
        skip: '\\\\.'
        rules:
            - constant.specialChar: '\\\\([0netr"\\\\\\*\\(\\)])'
            - constant.specialChar: '%(%|[scdo])'

    # -------------------------
    # Numbers
    # (leading 0 commonly used for octal constants)
    # -------------------------
    - constant.number: '\b0[0-7]+\b'
    - constant.number: '\b[0-9]+\b'

    # -------------------------
    # Keywords / storage (keep tight + old-school)
    # -------------------------
    - statement: '\b(if|else|while|switch|case|default|break|return|goto)\b'
    - type: '\b(extrn|auto)\b'

    # -------------------------
    # Common B library calls (/etc/libb.a era list)
    # -------------------------
    - constant.builtin: '\b(char|getchr|putchr|exit|printf|seek|setuid|stat|time|unlink|wait|lchar|chdir|chmod|chown|close|creat|execl|execv|fork|fstat|getuid|intr|link|makdir|open|read|write|ctime)\b'

    # -------------------------
    # Labels and function-ish identifiers
    # -------------------------
    # label (often at bol)
    - identifier: '^\s*[_A-Za-z][_A-Za-z0-9]*\s*:'
    # function call/def name before '('
    - identifier: '\b[_A-Za-z][_A-Za-z0-9]*\s*\('

    # -------------------------
    # Operators (order matters: longer first)
    # Thompson-ish assignment operators in B are =+, =-, =*, =/, =%, =<<, =>>, =& , =|
    # -------------------------
    - symbol.operator: '(=<<|=>>|=\+|=-|=\*|=/|=%|=&|=\|)'
    - symbol.operator: '(==|!=|<=|>=|<<|>>)'
    - symbol.operator: '(\+\+|--|\*\*)'
    - symbol.operator: '[-+*/%&|^~!=<>?:=]'

    # -------------------------
    # Brackets
    # -------------------------
    - symbol.brackets: '[(){}\[\]]'

    # -------------------------
    # Identifiers / variables (last so keywords win)
    # -------------------------
    - identifier: '\b[_A-Za-z][_A-Za-z0-9]*\b'