Renamespace lib/rdoc/markup from SM::SimpleMarkup to RDoc::Markup.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15033 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rdoc/markup/to_html.rb

@@ -0,0 +1,286 @@
+require 'rdoc/markup/fragments'
+require 'rdoc/markup/inline'
+
+require 'cgi'
+
+class RDoc::Markup::ToHtml
+
+  LIST_TYPE_TO_HTML = {
+    RDoc::Markup::ListBase::BULLET =>  [ "<ul>", "</ul>" ],
+    RDoc::Markup::ListBase::NUMBER =>  [ "<ol>", "</ol>" ],
+    RDoc::Markup::ListBase::UPPERALPHA =>  [ "<ol>", "</ol>" ],
+    RDoc::Markup::ListBase::LOWERALPHA =>  [ "<ol>", "</ol>" ],
+    RDoc::Markup::ListBase::LABELED => [ "<dl>", "</dl>" ],
+    RDoc::Markup::ListBase::NOTE    => [ "<table>", "</table>" ],
+  }
+
+  InlineTag = Struct.new(:bit, :on, :off)
+
+  def initialize
+    init_tags
+  end
+
+  ##
+  # Set up the standard mapping of attributes to HTML tags
+
+  def init_tags
+    @attr_tags = [
+      InlineTag.new(RDoc::Markup::Attribute.bitmap_for(:BOLD), "<b>", "</b>"),
+      InlineTag.new(RDoc::Markup::Attribute.bitmap_for(:TT),   "<tt>", "</tt>"),
+      InlineTag.new(RDoc::Markup::Attribute.bitmap_for(:EM),   "<em>", "</em>"),
+    ]
+  end
+
+  ##
+  # Add a new set of HTML tags for an attribute. We allow separate start and
+  # end tags for flexibility.
+
+  def add_tag(name, start, stop)
+    @attr_tags << InlineTag.new(RDoc::Markup::Attribute.bitmap_for(name), start, stop)
+  end
+
+  ##
+  # Given an HTML tag, decorate it with class information and the like if
+  # required. This is a no-op in the base class, but is overridden in HTML
+  # output classes that implement style sheets.
+
+  def annotate(tag)
+    tag
+  end
+
+  ##
+  # Here's the client side of the visitor pattern
+
+  def start_accepting
+    @res = ""
+    @in_list_entry = []
+  end
+
+  def end_accepting
+    @res
+  end
+
+  def accept_paragraph(am, fragment)
+    @res << annotate("<p>") + "\n"
+    @res << wrap(convert_flow(am.flow(fragment.txt)))
+    @res << annotate("</p>") + "\n"
+  end
+
+  def accept_verbatim(am, fragment)
+    @res << annotate("<pre>") + "\n"
+    @res << CGI.escapeHTML(fragment.txt)
+    @res << annotate("</pre>") << "\n"
+  end
+
+  def accept_rule(am, fragment)
+    size = fragment.param
+    size = 10 if size > 10
+    @res << "<hr size=\"#{size}\"></hr>"
+  end
+
+  def accept_list_start(am, fragment)
+    @res << html_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 << annotate(tag) << "\n"
+    end
+    @res << html_list_name(fragment.type, false) << "\n"
+  end
+
+  def accept_list_item(am, fragment)
+    if tag = @in_list_entry.last
+      @res << annotate(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 << annotate("<p />") << "\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 << annotate(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 << annotate(tag.off)
+      end
+    end
+  end
+
+  def convert_flow(flow)
+    res = ""
+
+    flow.each do |item|
+      case item
+      when String
+        res << convert_string(item)
+      when RDoc::Markup::AttrChanger
+        off_tags(res, item)
+        on_tags(res,  item)
+      when RDoc::Markup::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)
+    CGI.escapeHTML(item).
+
+    # convert -- to em-dash, (-- to en-dash)
+      gsub(/---?/, '&#8212;'). #gsub(/--/, '&#8211;').
+
+    # convert ... to elipsis (and make sure .... becomes .<elipsis>)
+      gsub(/\.\.\.\./, '.&#8230;').gsub(/\.\.\./, '&#8230;').
+
+    # convert single closing quote
+      gsub(%r{([^ \t\r\n\[\{\(])\'}) { "#$1&#8217;" }.
+      gsub(%r{\'(?=\W|s\b)}) { "&#8217;" }.
+
+    # convert single opening quote
+      gsub(/'/, '&#8216;').
+
+    # convert double closing quote
+      gsub(%r{([^ \t\r\n\[\{\(])\'(?=\W)}) { "#$1&#8221;" }.
+
+    # convert double opening quote
+      gsub(/'/, '&#8220;').
+
+    # convert copyright
+      gsub(/\(c\)/, '&#169;').
+
+    # convert and registered trademark
+      gsub(/\(r\)/, '&#174;')
+
+  end
+
+  def convert_special(special)
+    handled = false
+    RDoc::Markup::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 =
+      annotate("<h#{level}>") +
+      convert_flow(flow) +
+      annotate("</h#{level}>\n")
+  end
+
+  def html_list_name(list_type, is_open_tag)
+    tags = LIST_TYPE_TO_HTML[list_type] || raise("Invalid list type: #{list_type.inspect}")
+    annotate(tags[ is_open_tag ? 0 : 1])
+  end
+
+  def list_item_start(am, fragment)
+    case fragment.type
+    when RDoc::Markup::ListBase::BULLET, RDoc::Markup::ListBase::NUMBER then
+      annotate("<li>")
+
+    when RDoc::Markup::ListBase::UPPERALPHA then
+      annotate("<li type=\"A\">")
+
+    when RDoc::Markup::ListBase::LOWERALPHA then
+      annotate("<li type=\"a\">")
+
+    when RDoc::Markup::ListBase::LABELED then
+      annotate("<dt>") +
+        convert_flow(am.flow(fragment.param)) +
+        annotate("</dt>") +
+        annotate("<dd>")
+
+    when RDoc::Markup::ListBase::NOTE then
+      annotate("<tr>") +
+        annotate("<td valign=\"top\">") +
+        convert_flow(am.flow(fragment.param)) +
+        annotate("</td>") +
+        annotate("<td>")
+    else
+      raise "Invalid list type"
+    end
+  end
+
+  def list_end_for(fragment_type)
+    case fragment_type
+    when RDoc::Markup::ListBase::BULLET, RDoc::Markup::ListBase::NUMBER,
+         RDoc::Markup::ListBase::UPPERALPHA,
+         RDoc::Markup::ListBase::LOWERALPHA then
+      "</li>"
+    when RDoc::Markup::ListBase::LABELED then
+      "</dd>"
+    when RDoc::Markup::ListBase::NOTE then
+      "</td></tr>"
+    else
+      raise "Invalid list type"
+    end
+  end
+
+end
+