smugglys/translatomatic

# https://en.wikipedia.org/wiki/.properties
grammar Properties
  rule document
    (whitespace / comment / definition)* {
      def content
        elements.collect { |i| i.content }.select { |i| i[0] != :whitespace }
      end
    }
  end

  rule comment
    start_comment comment_content end_comment {
      def content
        [:comment, elements[1].text_value, elements[0].text_value]
      end
    }
  end

  rule start_comment
    '#' / '!'
  end

  rule eof
    !character
  end

  rule end_comment
    newline / eof
  end

  rule comment_content
    (!end_comment character)+
  end

  rule definition
    key assignment value? end_definition {
      def content
        [:definition, elements[0].text_value, elements[2] ? elements[2].text_value : nil]
      end
    }
  end

  rule end_definition
    newline / eof
  end

  rule newline
    "\n"
  end

  rule line_continuation
    "\\" newline whitespace*
  end

  rule assignment
    whitespace* ('=' / ':') whitespace*
  end

  rule character
    .
  end

  rule key
    ('\\ ' / !assignment character)+
    #(!assignment word)+
  end

  rule value_character
    line_continuation / character
  end

  rule word
    ('\\ ' / !assignment character)+
  end

  rule value
    (!newline value_character)+
  end

  rule whitespace
    [ \t\r\n] {
      def content
        [:whitespace, text_value]
      end
    }
  end
end