lib/rdoc/markup/to_html.rb
# frozen_string_literal: true
require 'cgi/util'
##
# Outputs RDoc markup as HTML.
class RDoc::Markup::ToHtml < RDoc::Markup::Formatter
include RDoc::Text
# :section: Utilities
##
# Maps RDoc::Markup::Parser::LIST_TOKENS types to HTML tags
LIST_TYPE_TO_HTML = {
:BULLET => ['<ul>', '</ul>'],
:LABEL => ['<dl class="rdoc-list label-list">', '</dl>'],
:LALPHA => ['<ol style="list-style-type: lower-alpha">', '</ol>'],
:NOTE => ['<dl class="rdoc-list note-list">', '</dl>'],
:NUMBER => ['<ol>', '</ol>'],
:UALPHA => ['<ol style="list-style-type: upper-alpha">', '</ol>'],
}
attr_reader :res # :nodoc:
attr_reader :in_list_entry # :nodoc:
attr_reader :list # :nodoc:
##
# The RDoc::CodeObject HTML is being generated for. This is used to
# generate namespaced URI fragments
attr_accessor :code_object
##
# Path to this document for relative links
attr_accessor :from_path
# :section:
##
# Creates a new formatter that will output HTML
def initialize options, markup = nil
super
@code_object = nil
@from_path = ''
@in_list_entry = nil
@list = nil
@th = nil
@hard_break = "<br>\n"
init_regexp_handlings
init_tags
end
# :section: Regexp Handling
#
# These methods are used by regexp handling markup added by RDoc::Markup#add_regexp_handling.
# :nodoc:
URL_CHARACTERS_REGEXP_STR = /[A-Za-z0-9\-._~:\/\?#\[\]@!$&'\(\)*+,;%=]/.source
##
# Adds regexp handlings.
def init_regexp_handlings
# external links
@markup.add_regexp_handling(/(?:link:|https?:|mailto:|ftp:|irc:|www\.)#{URL_CHARACTERS_REGEXP_STR}+\w/,
:HYPERLINK)
init_link_notation_regexp_handlings
end
##
# Adds regexp handlings about link notations.
def init_link_notation_regexp_handlings
add_regexp_handling_RDOCLINK
add_regexp_handling_TIDYLINK
end
def handle_RDOCLINK url # :nodoc:
case url
when /^rdoc-ref:/
CGI.escapeHTML($')
when /^rdoc-label:/
text = $'
text = case text
when /\Alabel-/ then $'
when /\Afootmark-/ then $'
when /\Afoottext-/ then $'
else text
end
gen_url CGI.escapeHTML(url), CGI.escapeHTML(text)
when /^rdoc-image:/
%[<img src=\"#{CGI.escapeHTML($')}\">]
when /\Ardoc-[a-z]+:/
CGI.escapeHTML($')
end
end
##
# +target+ is a <code><br></code>
def handle_regexp_HARD_BREAK target
'<br>'
end
##
# +target+ is a potential link. The following schemes are handled:
#
# <tt>mailto:</tt>::
# Inserted as-is.
# <tt>http:</tt>::
# Links are checked to see if they reference an image. If so, that image
# gets inserted using an <tt><img></tt> tag. Otherwise a conventional
# <tt><a href></tt> is used.
# <tt>link:</tt>::
# Reference to a local file relative to the output directory.
def handle_regexp_HYPERLINK(target)
url = CGI.escapeHTML(target.text)
gen_url url, url
end
##
# +target+ is an rdoc-schemed link that will be converted into a hyperlink.
#
# For the +rdoc-ref+ scheme the named reference will be returned without
# creating a link.
#
# For the +rdoc-label+ scheme the footnote and label prefixes are stripped
# when creating a link. All other contents will be linked verbatim.
def handle_regexp_RDOCLINK target
handle_RDOCLINK target.text
end
##
# This +target+ is a link where the label is different from the URL
# <tt>label[url]</tt> or <tt>{long label}[url]</tt>
def handle_regexp_TIDYLINK(target)
text = target.text
return text unless
text =~ /^\{(.*)\}\[(.*?)\]$/ or text =~ /^(\S+)\[(.*?)\]$/
label = $1
url = CGI.escapeHTML($2)
if /^rdoc-image:/ =~ label
label = handle_RDOCLINK(label)
else
label = CGI.escapeHTML(label)
end
gen_url url, label
end
# :section: Visitor
#
# These methods implement the HTML visitor.
##
# Prepares the visitor for HTML generation
def start_accepting
@res = []
@in_list_entry = []
@list = []
end
##
# Returns the generated output
def end_accepting
@res.join
end
##
# Adds +block_quote+ to the output
def accept_block_quote block_quote
@res << "\n<blockquote>"
block_quote.parts.each do |part|
part.accept self
end
@res << "</blockquote>\n"
end
##
# Adds +paragraph+ to the output
def accept_paragraph paragraph
@res << "\n<p>"
text = paragraph.text @hard_break
text = text.gsub(/(#{SPACE_SEPARATED_LETTER_CLASS})?\K\r?\n(?=(?(1)(#{SPACE_SEPARATED_LETTER_CLASS})?))/o) {
defined?($2) && ' '
}
@res << to_html(text)
@res << "</p>\n"
end
##
# Adds +verbatim+ to the output
def accept_verbatim verbatim
text = verbatim.text.rstrip
klass = nil
content = if verbatim.ruby? or parseable? text then
begin
tokens = RDoc::Parser::RipperStateLex.parse text
klass = ' class="ruby"'
result = RDoc::TokenStream.to_html tokens
result = result + "\n" unless "\n" == result[-1]
result
rescue
CGI.escapeHTML text
end
else
CGI.escapeHTML text
end
if @options.pipe then
@res << "\n<pre><code>#{CGI.escapeHTML text}\n</code></pre>\n"
else
@res << "\n<pre#{klass}>#{content}</pre>\n"
end
end
##
# Adds +rule+ to the output
def accept_rule rule
@res << "<hr>\n"
end
##
# Prepares the visitor for consuming +list+
def accept_list_start(list)
@list << list.type
@res << html_list_name(list.type, true)
@in_list_entry.push false
end
##
# Finishes consumption of +list+
def accept_list_end(list)
@list.pop
if tag = @in_list_entry.pop
@res << tag
end
@res << html_list_name(list.type, false) << "\n"
end
##
# Prepares the visitor for consuming +list_item+
def accept_list_item_start(list_item)
if tag = @in_list_entry.last
@res << tag
end
@res << list_item_start(list_item, @list.last)
end
##
# Finishes consumption of +list_item+
def accept_list_item_end(list_item)
@in_list_entry[-1] = list_end_for(@list.last)
end
##
# Adds +blank_line+ to the output
def accept_blank_line(blank_line)
# @res << annotate("<p />") << "\n"
end
##
# Adds +heading+ to the output. The headings greater than 6 are trimmed to
# level 6.
def accept_heading heading
level = [6, heading.level].min
label = heading.label @code_object
@res << if @options.output_decoration
"\n<h#{level} id=\"#{label}\">"
else
"\n<h#{level}>"
end
@res << to_html(heading.text)
unless @options.pipe then
@res << "<span><a href=\"##{label}\">¶</a>"
@res << " <a href=\"#top\">↑</a></span>"
end
@res << "</h#{level}>\n"
end
##
# Adds +raw+ to the output
def accept_raw raw
@res << raw.parts.join("\n")
end
##
# Adds +table+ to the output
def accept_table header, body, aligns
@res << "\n<table role=\"table\">\n<thead>\n<tr>\n"
header.zip(aligns) do |text, align|
@res << '<th'
@res << ' align="' << align << '"' if align
@res << '>' << to_html(text) << "</th>\n"
end
@res << "</tr>\n</thead>\n<tbody>\n"
body.each do |row|
@res << "<tr>\n"
row.zip(aligns) do |text, align|
@res << '<td'
@res << ' align="' << align << '"' if align
@res << '>' << to_html(text) << "</td>\n"
end
@res << "</tr>\n"
end
@res << "</tbody>\n</table>\n"
end
# :section: Utilities
##
# CGI-escapes +text+
def convert_string(text)
CGI.escapeHTML text
end
##
# Generate a link to +url+ with content +text+. Handles the special cases
# for img: and link: described under handle_regexp_HYPERLINK
def gen_url url, text
scheme, url, id = parse_url url
if %w[http https link].include?(scheme) and
url =~ /\.(gif|png|jpg|jpeg|bmp)$/ then
"<img src=\"#{url}\" />"
else
if scheme != 'link' and %r%\A((?!https?:)(?:[^/#]*/)*+)([^/#]+)\.(rb|rdoc|md)(?=\z|#)%i =~ url
url = "#$1#{$2.tr('.', '_')}_#$3.html#$'"
end
text = text.sub %r%^#{scheme}:/*%i, ''
text = text.sub %r%^[*\^](\d+)$%, '\1'
link = "<a#{id} href=\"#{url}\">#{text}</a>"
link = "<sup>#{link}</sup>" if /"foot/ =~ id
link
end
end
##
# Determines the HTML list element for +list_type+ and +open_tag+
def html_list_name(list_type, open_tag)
tags = LIST_TYPE_TO_HTML[list_type]
raise RDoc::Error, "Invalid list type: #{list_type.inspect}" unless tags
tags[open_tag ? 0 : 1]
end
##
# Maps attributes to HTML tags
def init_tags
add_tag :BOLD, "<strong>", "</strong>"
add_tag :TT, "<code>", "</code>"
add_tag :EM, "<em>", "</em>"
end
##
# Returns the HTML tag for +list_type+, possible using a label from
# +list_item+
def list_item_start(list_item, list_type)
case list_type
when :BULLET, :LALPHA, :NUMBER, :UALPHA then
"<li>"
when :LABEL, :NOTE then
Array(list_item.label).map do |label|
"<dt>#{to_html label}\n"
end.join << "<dd>"
else
raise RDoc::Error, "Invalid list type: #{list_type.inspect}"
end
end
##
# Returns the HTML end-tag for +list_type+
def list_end_for(list_type)
case list_type
when :BULLET, :LALPHA, :NUMBER, :UALPHA then
"</li>"
when :LABEL, :NOTE then
"</dd>"
else
raise RDoc::Error, "Invalid list type: #{list_type.inspect}"
end
end
##
# Returns true if text is valid ruby syntax
def parseable? text
verbose, $VERBOSE = $VERBOSE, nil
catch(:valid) do
eval("BEGIN { throw :valid, true }\n#{text}")
end
rescue SyntaxError
false
ensure
$VERBOSE = verbose
end
##
# Converts +item+ to HTML using RDoc::Text#to_html
def to_html item
super convert_flow @am.flow item
end
end