Class: SM::ToLaTeX

Class | SM::ToLaTeX
In: | rdoc/markup/simple_markup/to_latex.rb
Parent: | Object

Convert SimpleMarkup to basic LaTeX report format

### Methods

escape init_tags l l new

### Constants

BS | = | "\020"
CB | = | "\022"
DL | = | "\023"
BACKSLASH | = | "#{BS}symbol#{OB}92#{CB}"
HAT | = | "#{BS}symbol#{OB}94#{CB}"
BACKQUOTE | = | "#{BS}symbol#{OB}0#{CB}"
TILDE | = | "#{DL}#{BS}sim#{DL}"
LESSTHAN | = | "#{DL}<#{DL}"
GREATERTHAN | = | "#{DL}>#{DL}"
LIST_TYPE_TO_LATEX | = | { ListBase::BULLET => [ l("\\begin{itemize}"), l("\\end{itemize}") ], ListBase::NUMBER => [ l("\\begin{enumerate}"), l("\\end{enumerate}"), "\\arabic" ], ListBase::UPPERALPHA => [ l("\\begin{enumerate}"), l("\\end{enumerate}"), "\\Alph" ], ListBase::LOWERALPHA => [ l("\\begin{enumerate}"), l("\\end{enumerate}"), "\\alph" ], ListBase::LABELED => [ l("\\begin{description}"), l("\\end{description}") ], ListBase::NOTE => [ l("\\begin{tabularx}{\\linewidth}{@{} l X @{}}"), l("\\end{tabularx}") ], }
InlineTag | = | Struct.new(:bit, :on, :off)

### Public Class methods

l(str)

[Source]

    # File rdoc/markup/simple_markup/to_latex.rb, line 24
        def self.l(str)
          str.tr('\\', BS).tr('{', OB).tr('}', CB).tr('$', DL)
        end

new()

[Source]

    # File rdoc/markup/simple_markup/to_latex.rb, line 45
        def initialize
          init_tags
          @list_depth = 0
          @prev_list_types = []
        end

### Public Instance methods

escape(str)

Escape a LaTeX string

[Source]

    # File rdoc/markup/simple_markup/to_latex.rb, line 64
        def escape(str)
    # $stderr.print "FE: ", str
          s = str.
    #        sub(/\s+$/, '').
            gsub(/([_\${}&%#])/, "#{BS}\\1").
            gsub(/\\/, BACKSLASH).
            gsub(/\^^/, HAT).
            gsub(/~/,  TILDE).
            gsub(/</,  LESSTHAN).
            gsub(/>/,  GREATERTHAN).
            gsub(/,,/, ",{},").
            gsub(/\`/,  BACKQUOTE)
    # $stderr.print "-> ", s, "\n"
          s
        end

        ##
        # Add a new set of LaTeX tags for an attribute. We allow
        # separate start and end tags for flexibility
        #
        def add_tag(name, start, stop)
          @attr_tags << InlineTag.new(SM::Attribute.bitmap_for(name), start, stop)
        end

        ##
        # Here's the client side of the visitor pattern

        def start_accepting
          @res = ""
          @in_list_entry = []
        end

        def end_accepting
          @res.tr(BS, '\\').tr(OB, '{').tr(CB, '}').tr(DL, '$')
        end

        def accept_paragraph(am, fragment)
          @res << wrap(convert_flow(am.flow(fragment.txt)))
          @res << "\n"
        end

        def accept_verbatim(am, fragment)
          @res << "\n\\begin{code}\n"
          @res << fragment.txt.sub(/[\n\s]+\Z/, '')
          @res << "\n\\end{code}\n\n"
        end

        def accept_rule(am, fragment)
          size = fragment.param
          size = 10 if size > 10
          @res << "\n\n\\rule{\\linewidth}{#{size}pt}\n\n"
        end

        def accept_list_start(am, fragment)
          @res << list_name(fragment.type, true) <<"\n"
          @in_list_entry.push false
        end

        def accept_list_end(am, fragment)
          if tag = @in_list_entry.pop
            @res << tag << "\n"
          end
          @res << list_name(fragment.type, false) <<"\n"
        end

        def accept_list_item(am, fragment)
          if tag = @in_list_entry.last
            @res << tag << "\n"
          end
          @res << list_item_start(am, fragment)
          @res << wrap(convert_flow(am.flow(fragment.txt))) << "\n"
          @in_list_entry[-1] = list_end_for(fragment.type)
        end

        def accept_blank_line(am, fragment)
          # @res << "\n"
        end

        def accept_heading(am, fragment)
          @res << convert_heading(fragment.head_level, am.flow(fragment.txt))
        end

        # This is a higher speed (if messier) version of wrap

        def wrap(txt, line_len = 76)
          res = ""
          sp = 0
          ep = txt.length
          while sp < ep
            # scan back for a space
            p = sp + line_len - 1
            if p >= ep
              p = ep
            else
              while p > sp and txt[p] != ?\s
                p -= 1
              end
              if p <= sp
                p = sp + line_len
                while p < ep and txt[p] != ?\s
                  p += 1
                end
              end
            end
            res << txt[sp...p] << "\n"
            sp = p
            sp += 1 while sp < ep and txt[sp] == ?\s
          end
          res
        end

        #######################################################################

        private

        #######################################################################

        def on_tags(res, item)
          attr_mask = item.turn_on
          return if attr_mask.zero?

          @attr_tags.each do |tag|
            if attr_mask & tag.bit != 0
              res << tag.on
            end
          end
        end

        def off_tags(res, item)
          attr_mask = item.turn_off
          return if attr_mask.zero?

          @attr_tags.reverse_each do |tag|
            if attr_mask & tag.bit != 0
              res << tag.off
            end
          end
        end

        def convert_flow(flow)
          res = ""
          flow.each do |item|
            case item
            when String
    #          $stderr.puts "Converting '#{item}'"
              res << convert_string(item)
            when AttrChanger
              off_tags(res, item)
              on_tags(res,  item)
            when Special
              res << convert_special(item)
            else
              raise "Unknown flow element: #{item.inspect}"
            end
          end
          res
        end

        # some of these patterns are taken from SmartyPants...

        def convert_string(item)

          escape(item).

          # convert ... to elipsis (and make sure .... becomes .<elipsis>)
            gsub(/\.\.\.\./, '.\ldots{}').gsub(/\.\.\./, '\ldots{}').

          # convert single closing quote
            gsub(%r{([^ \t\r\n\[\{\(])\'}) { "#$1'" }.
            gsub(%r{\'(?=\W|s\b)}) { "'" }.

          # convert single opening quote
            gsub(/'/, '`').

          # convert double closing quote
            gsub(%r{([^ \t\r\n\[\{\(])\"(?=\W)}) { "#$1''" }.

          # convert double opening quote
            gsub(/"/, "``").

          # convert copyright
            gsub(/\(c\)/, '\copyright{}')

        end

        def convert_special(special)
          handled = false
          Attribute.each_name_of(special.type) do |name|
            method_name = "handle_special_#{name}"
            if self.respond_to? method_name
              special.text = send(method_name, special)
              handled = true
            end
          end
          raise "Unhandled special: #{special}" unless handled
          special.text
        end

        def convert_heading(level, flow)
          res =
            case level
            when 1 then "\\chapter{"
            when 2 then "\\section{"
            when 3 then "\\subsection{"
            when 4 then "\\subsubsection{"
            else  "\\paragraph{"
            end +
            convert_flow(flow) +
            "}\n"
        end

        def list_name(list_type, is_open_tag)
          tags = LIST_TYPE_TO_LATEX[list_type] || raise("Invalid list type: #{list_type.inspect}")
          if tags[2] # enumerate
            if is_open_tag
              @list_depth += 1
              if @prev_list_types[@list_depth] != tags[2]
                case @list_depth
                when 1
                  roman = "i"
                when 2
                  roman = "ii"
                when 3
                  roman = "iii"
                when 4
                  roman = "iv"
                else
                  raise("Too deep list: level #{@list_depth}")
                end
                @prev_list_types[@list_depth] = tags[2]
                return l("\\renewcommand{\\labelenum#{roman}}{#{tags[2]}{enum#{roman}}}") + "\n" + tags[0]
              end
            else
              @list_depth -= 1
            end
          end
          tags[ is_open_tag ? 0 : 1]
        end

        def list_item_start(am, fragment)
          case fragment.type
          when ListBase::BULLET, ListBase::NUMBER, ListBase::UPPERALPHA, ListBase::LOWERALPHA
            "\\item "

          when ListBase::LABELED
            "\\item[" + convert_flow(am.flow(fragment.param)) + "] "

          when ListBase::NOTE
              convert_flow(am.flow(fragment.param)) + " & "
          else
            raise "Invalid list type"
          end
        end

        def list_end_for(fragment_type)
          case fragment_type
          when ListBase::BULLET, ListBase::NUMBER, ListBase::UPPERALPHA, ListBase::LOWERALPHA, ListBase::LABELED
            ""
          when ListBase::NOTE
            "\\\\\n"
          else
            raise "Invalid list type"
          end
        end

      end

    end

init_tags()

Set up the standard mapping of attributes to LaTeX

[Source]

    # File rdoc/markup/simple_markup/to_latex.rb, line 54
        def init_tags
          @attr_tags = [
            InlineTag.new(SM::Attribute.bitmap_for(:BOLD), l("\\textbf{"), l("}")),
            InlineTag.new(SM::Attribute.bitmap_for(:TT),   l("\\texttt{"), l("}")),
            InlineTag.new(SM::Attribute.bitmap_for(:EM),   l("\\emph{"), l("}")),
          ]
        end

l(arg)

[Source]

    # File rdoc/markup/simple_markup/to_latex.rb, line 28
        def l(arg)
          SM::ToLaTeX.l(arg)
        end

[Validate]