a little treetop grammar

gistfile1.txt

grammar MExpressions
  
  rule boolean
    "#" [tf]
  end

  rule integer
    decimal_integer / hex_integer / octal_integer / binary_integer
  end

  rule decimal_integer
    "#d"? [0-9] +
  end

  rule hex_integer
    "#x" [[0-9][a-f])+
  end

  rule octal_integer
    "#o" [0-7]+
  end

  rule binary_integer
    "#b" [01]+
  end
  
end