micro/runtime/syntax/crystal.yaml

filetype: crystal

detect:
    filename: "\\.cr$"

rules:
    # Asciibetical list of reserved words
    - statement: "\\b(BEGIN|END|abstract|alias|and|begin|break|case|class|def|defined\\?|do|else|elsif|end|ensure|enum|false|for|fun|if|in|include|lib|loop|macro|module|next|nil|not|of|or|pointerof|private|protected|raise|redo|require|rescue|retry|return|self|sizeof|spawn|struct|super|then|true|type|undef|union|uninitialized|unless|until|when|while|yield)\\b"
      # Constants
    - constant: "(\\$|@|@@)?\\b[A-Z]+[0-9A-Z_a-z]*"
    - constant.number: "\\b[0-9]+\\b"
      # Crystal "symbols"
    - constant:  "([ 	]|^):[0-9A-Z_]+\\b"
      # Some unique things we want to stand out
    - constant: "\\b(__FILE__|__LINE__)\\b"
      # Regular expressions
    - constant: "/([^/]|(\\\\/))*/[iomx]*|%r\\{([^}]|(\\\\}))*\\}[iomx]*"

      # Shell command expansion is in `backticks` or like %x{this}.  These are
      # "double-quotish" (to use a perlism).
    - constant.string: "`[^`]*`|%x\\{[^}]*\\}"

    - constant.string:
        start: "`"
        end: "`"
        rules: []

    - constant.string:
        start: "%x\\{"
        end: "\\}"
        rules: []

    - constant.string:
        start: "\""
        end: "\""
        skip: "\\\\."
        rules:
            - constant.specialChar: "\\\\."
            - special: "#\\{[^}]*\\}"

    - constant.string:
        start: "'"
        end: "'"
        skip: "\\\\."
        rules:
            - constant.specialChar: "\\\\."

    - comment:
        start: "#"
        end: "$"
        rules:
            - todo: "(TODO|XXX|FIXME):?"

    - comment.bright:
        start: "##"
        end: "$"
        rules:
            - todo: "(TODO|XXX|FIXME):?"

    - constant:
        start: "<<-?'?EOT'?"
        end: "^EOT"
        rules: []