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# :markup: markdown ## # Outputs parsed markup as Markdown class RDoc::Markup::ToMarkdown < RDoc::Markup::ToRdoc ## # Creates a new formatter that will output Markdown format text def initialize markup = nil super @headings[1] = ['# ', ''] @headings[2] = ['## ', ''] @headings[3] = ['### ', ''] @headings[4] = ['#### ', ''] @headings[5] = ['##### ', ''] @headings[6] = ['###### ', ''] add_special_RDOCLINK add_special_TIDYLINK @hard_break = " \n" end ## # Maps attributes to HTML sequences def init_tags add_tag :BOLD, '**', '**' add_tag :EM, '*', '*' add_tag :TT, '`', '`' end ## # Adds a newline to the output def handle_special_HARD_BREAK special " \n" end ## # Finishes consumption of `list` def accept_list_end list @res << "\n" super end ## # Finishes consumption of `list_item` def accept_list_item_end list_item width = case @list_type.last when :BULLET then 4 when :NOTE, :LABEL then use_prefix 4 else @list_index[-1] = @list_index.last.succ 4 end @indent -= width end ## # Prepares the visitor for consuming `list_item` def accept_list_item_start list_item type = @list_type.last case type when :NOTE, :LABEL then bullets = Array(list_item.label).map do |label| attributes(label).strip end.join "\n" bullets << "\n:" @prefix = ' ' * @indent @indent += 4 @prefix << bullets + (' ' * (@indent - 1)) else bullet = type == :BULLET ? '*' : @list_index.last.to_s + '.' @prefix = (' ' * @indent) + bullet.ljust(4) @indent += 4 end end ## # Prepares the visitor for consuming `list` def accept_list_start list case list.type when :BULLET, :LABEL, :NOTE then @list_index << nil when :LALPHA, :NUMBER, :UALPHA then @list_index << 1 else raise RDoc::Error, "invalid list type #{list.type}" end @list_width << 4 @list_type << list.type end ## # Adds `rule` to the output def accept_rule rule use_prefix or @res << ' ' * @indent @res << '-' * 3 @res << "\n" end ## # Outputs `verbatim` indented 4 columns def accept_verbatim verbatim indent = ' ' * (@indent + 4) verbatim.parts.each do |part| @res << indent unless part == "\n" @res << part end @res << "\n" unless @res =~ /\n\z/ end ## # Creates a Markdown-style URL from +url+ with +text+. def gen_url url, text scheme, url, = parse_url url "[#{text.sub(%r{^#{scheme}:/*}i, '')}](#{url})" end ## # Handles <tt>rdoc-</tt> type links for footnotes. def handle_rdoc_link url case url when /^rdoc-ref:/ then $' when /^rdoc-label:footmark-(\d+)/ then "[^#{$1}]:" when /^rdoc-label:foottext-(\d+)/ then "[^#{$1}]" when /^rdoc-label:label-/ then gen_url url, $' when /^rdoc-image:/ then "![](#{$'})" when /^rdoc-[a-z]+:/ then $' end end ## # Converts the RDoc markup tidylink into a Markdown.style link. def handle_special_TIDYLINK special text = special.text return text unless text =~ /\{(.*?)\}\[(.*?)\]/ or text =~ /(\S+)\[(.*?)\]/ label = $1 url = $2 if url =~ /^rdoc-label:foot/ then handle_rdoc_link url else gen_url url, label end end ## # Converts the rdoc-...: links into a Markdown.style links. def handle_special_RDOCLINK special handle_rdoc_link special.text end end