gistfile1.rbx

# Treetop file for the never released Oil
# Oil's spiritual successor is the released Jasper [ http://github.com/defunkt/jasper ]

module Oil
  grammar Grammar
    rule program
      (space expression space)*
    end
    
    rule expression
      '(' list ')' <Oil::Expression>
    end
    
    rule list
      (space element:(comment / slot_access / token / expression) space)*
    end

    rule slot_access
      receiver:token slots:('.' symbol)+ <Oil::SlotAccess>
    end
            
    rule token
      string / float / number / symbol
    end
    
    rule string
      '"' inner_text:(!'"' . / '\"')* '"' <Oil::String>
    end
    
    rule float
      number '.' number
    end
    
    rule number
      '-'? [0-9]+ <Oil::Number>
    end
    
    rule comment
      "#" comment_string* <Oil::Comment>
    end
    
    rule comment_string
      '(' comment_string ')' / space [^()]+ space
    end

    rule space
      [ \n]*
    end
    
    rule symbol
      [a-zA-Z`~!@$%^&*_=+\[\]{}|;:',<>/?-]+ <Oil::Symbol>
    end    
  end
end