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require 'rdoc/markup/simple_markup/fragments'
require 'rdoc/markup/simple_markup/inline'
require 'cgi'
module SM
class ToHtml
LIST_TYPE_TO_HTML = {
ListBase::BULLET => [ "<ul>", "</ul>" ],
ListBase::NUMBER => [ "<ol>", "</ol>" ],
ListBase::UPPERALPHA => [ "<ol>", "</ol>" ],
ListBase::LOWERALPHA => [ "<ol>", "</ol>" ],
ListBase::LABELED => [ "<dl>", "</dl>" ],
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(SM::Attribute.bitmap_for(:BOLD), "<b>", "</b>"),
InlineTag.new(SM::Attribute.bitmap_for(:TT), "<tt>", "</tt>"),
InlineTag.new(SM::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(SM::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 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)
CGI.escapeHTML(item).
# convert -- to em-dash, (-- to en-dash)
gsub(/---?/, '—'). #gsub(/--/, '–').
# convert ... to elipsis (and make sure .... becomes .<elipsis>)
gsub(/\.\.\.\./, '.…').gsub(/\.\.\./, '…').
# 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(/\(c\)/, '©').
# convert and registered trademark
gsub(/\(r\)/, '®')
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 =
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 ListBase::BULLET, ListBase::NUMBER
annotate("<li>")
when ListBase::UPPERALPHA
annotate("<li type=\"A\">")
when ListBase::LOWERALPHA
annotate("<li type=\"a\">")
when ListBase::LABELED
annotate("<dt>") +
convert_flow(am.flow(fragment.param)) +
annotate("</dt>") +
annotate("<dd>")
when ListBase::NOTE
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 ListBase::BULLET, ListBase::NUMBER, ListBase::UPPERALPHA, ListBase::LOWERALPHA
"</li>"
when ListBase::LABELED
"</dd>"
when ListBase::NOTE
"</td></tr>"
else
raise "Invalid list type"
end
end
end
end