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require 'rdoc/markup'
##
# Base class for RDoc markup formatters
#
# Formatters use a visitor pattern to convert content into output.
class RDoc::Markup::Formatter
InlineTag = Struct.new(:bit, :on, :off)
##
# Creates a new Formatter
def initialize
@markup = RDoc::Markup.new
@am = @markup.attribute_manager
@attr_tags = []
@in_tt = 0
@tt_bit = RDoc::Markup::Attribute.bitmap_for :TT
end
##
# Add a new set of tags for an attribute. We allow separate start and end
# tags for flexibility
def add_tag(name, start, stop)
attr = RDoc::Markup::Attribute.bitmap_for name
@attr_tags << InlineTag.new(attr, start, stop)
end
##
# Allows +tag+ to be decorated with additional information.
def annotate(tag)
tag
end
##
# Marks up +content+
def convert(content)
@markup.convert content, self
end
##
# Converts flow items +flow+
def convert_flow(flow)
res = []
flow.each do |item|
case item
when String then
res << convert_string(item)
when RDoc::Markup::AttrChanger then
off_tags res, item
on_tags res, item
when RDoc::Markup::Special then
res << convert_special(item)
else
raise "Unknown flow element: #{item.inspect}"
end
end
res.join
end
##
# Converts added specials. See RDoc::Markup#add_special
def convert_special(special)
handled = false
RDoc::Markup::Attribute.each_name_of special.type do |name|
method_name = "handle_special_#{name}"
if respond_to? method_name then
special.text = send method_name, special
handled = true
end
end
raise "Unhandled special: #{special}" unless handled
special.text
end
##
# Converts a string to be fancier if desired
def convert_string string
string
end
##
# Are we currently inside tt tags?
def in_tt?
@in_tt > 0
end
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 then
res << annotate(tag.on)
@in_tt += 1 if tt? tag
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 then
@in_tt -= 1 if tt? tag
res << annotate(tag.off)
end
end
end
##
# Is +tag+ a tt tag?
def tt? tag
tag.bit == @tt_bit
end
end
class RDoc::Markup
autoload :ToAnsi, 'rdoc/markup/to_ansi'
autoload :ToBs, 'rdoc/markup/to_bs'
autoload :ToHtml, 'rdoc/markup/to_html'
autoload :ToHtmlCrossref, 'rdoc/markup/to_html_crossref'
autoload :ToRdoc, 'rdoc/markup/to_rdoc'
end
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