498 lines
17 KiB
Ruby
498 lines
17 KiB
Ruby
# -*- coding: utf-8 -*-
|
|
#
|
|
#--
|
|
# Copyright (C) 2009-2016 Thomas Leitner <t_leitner@gmx.at>
|
|
#
|
|
# This file is part of kramdown which is licensed under the MIT.
|
|
#++
|
|
#
|
|
|
|
require 'kramdown/parser'
|
|
require 'kramdown/converter'
|
|
require 'kramdown/utils'
|
|
|
|
module Kramdown
|
|
|
|
module Converter
|
|
|
|
# Converts a Kramdown::Document to HTML.
|
|
#
|
|
# You can customize the HTML converter by sub-classing it and overriding the +convert_NAME+
|
|
# methods. Each such method takes the following parameters:
|
|
#
|
|
# [+el+] The element of type +NAME+ to be converted.
|
|
#
|
|
# [+indent+] A number representing the current amount of spaces for indent (only used for
|
|
# block-level elements).
|
|
#
|
|
# The return value of such a method has to be a string containing the element +el+ formatted as
|
|
# HTML element.
|
|
class Html < Base
|
|
|
|
include ::Kramdown::Utils::Html
|
|
include ::Kramdown::Parser::Html::Constants
|
|
|
|
# The amount of indentation used when nesting HTML tags.
|
|
attr_accessor :indent
|
|
|
|
# Initialize the HTML converter with the given Kramdown document +doc+.
|
|
def initialize(root, options)
|
|
super
|
|
@footnote_counter = @footnote_start = @options[:footnote_nr]
|
|
@footnotes = []
|
|
@footnotes_by_name = {}
|
|
@footnote_location = nil
|
|
@toc = []
|
|
@toc_code = nil
|
|
@indent = 2
|
|
@stack = []
|
|
end
|
|
|
|
# The mapping of element type to conversion method.
|
|
DISPATCHER = Hash.new {|h,k| h[k] = "convert_#{k}"}
|
|
|
|
# Dispatch the conversion of the element +el+ to a +convert_TYPE+ method using the +type+ of
|
|
# the element.
|
|
def convert(el, indent = -@indent)
|
|
send(DISPATCHER[el.type], el, indent)
|
|
end
|
|
|
|
# Return the converted content of the children of +el+ as a string. The parameter +indent+ has
|
|
# to be the amount of indentation used for the element +el+.
|
|
#
|
|
# Pushes +el+ onto the @stack before converting the child elements and pops it from the stack
|
|
# afterwards.
|
|
def inner(el, indent)
|
|
result = ''
|
|
indent += @indent
|
|
@stack.push(el)
|
|
el.children.each do |inner_el|
|
|
result << send(DISPATCHER[inner_el.type], inner_el, indent)
|
|
end
|
|
@stack.pop
|
|
result
|
|
end
|
|
|
|
def convert_blank(el, indent)
|
|
"\n"
|
|
end
|
|
|
|
def convert_text(el, indent)
|
|
escape_html(el.value, :text)
|
|
end
|
|
|
|
def convert_p(el, indent)
|
|
if el.options[:transparent]
|
|
inner(el, indent)
|
|
else
|
|
format_as_block_html(el.type, el.attr, inner(el, indent), indent)
|
|
end
|
|
end
|
|
|
|
def convert_codeblock(el, indent)
|
|
attr = el.attr.dup
|
|
lang = extract_code_language!(attr)
|
|
hl_opts = {}
|
|
highlighted_code = highlight_code(el.value, el.options[:lang] || lang, :block, hl_opts)
|
|
|
|
if highlighted_code
|
|
add_syntax_highlighter_to_class_attr(attr, lang || hl_opts[:default_lang])
|
|
"#{' '*indent}<div#{html_attributes(attr)}>#{highlighted_code}#{' '*indent}</div>\n"
|
|
else
|
|
result = escape_html(el.value)
|
|
result.chomp!
|
|
if el.attr['class'].to_s =~ /\bshow-whitespaces\b/
|
|
result.gsub!(/(?:(^[ \t]+)|([ \t]+$)|([ \t]+))/) do |m|
|
|
suffix = ($1 ? '-l' : ($2 ? '-r' : ''))
|
|
m.scan(/./).map do |c|
|
|
case c
|
|
when "\t" then "<span class=\"ws-tab#{suffix}\">\t</span>"
|
|
when " " then "<span class=\"ws-space#{suffix}\">⋅</span>"
|
|
end
|
|
end.join('')
|
|
end
|
|
end
|
|
code_attr = {}
|
|
code_attr['class'] = "language-#{lang}" if lang
|
|
"#{' '*indent}<pre#{html_attributes(attr)}><code#{html_attributes(code_attr)}>#{result}\n</code></pre>\n"
|
|
end
|
|
end
|
|
|
|
def convert_blockquote(el, indent)
|
|
format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
|
|
end
|
|
|
|
def convert_header(el, indent)
|
|
attr = el.attr.dup
|
|
if @options[:auto_ids] && !attr['id']
|
|
attr['id'] = generate_id(el.options[:raw_text])
|
|
end
|
|
@toc << [el.options[:level], attr['id'], el.children] if attr['id'] && in_toc?(el)
|
|
level = output_header_level(el.options[:level])
|
|
format_as_block_html("h#{level}", attr, inner(el, indent), indent)
|
|
end
|
|
|
|
def convert_hr(el, indent)
|
|
"#{' '*indent}<hr#{html_attributes(el.attr)} />\n"
|
|
end
|
|
|
|
def convert_ul(el, indent)
|
|
if !@toc_code && (el.options[:ial][:refs].include?('toc') rescue nil)
|
|
@toc_code = [el.type, el.attr, (0..128).to_a.map{|a| rand(36).to_s(36)}.join]
|
|
@toc_code.last
|
|
elsif !@footnote_location && el.options[:ial] && (el.options[:ial][:refs] || []).include?('footnotes')
|
|
@footnote_location = (0..128).to_a.map{|a| rand(36).to_s(36)}.join
|
|
else
|
|
format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
|
|
end
|
|
end
|
|
alias :convert_ol :convert_ul
|
|
|
|
def convert_dl(el, indent)
|
|
format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
|
|
end
|
|
|
|
def convert_li(el, indent)
|
|
output = ' '*indent << "<#{el.type}" << html_attributes(el.attr) << ">"
|
|
res = inner(el, indent)
|
|
if el.children.empty? || (el.children.first.type == :p && el.children.first.options[:transparent])
|
|
output << res << (res =~ /\n\Z/ ? ' '*indent : '')
|
|
else
|
|
output << "\n" << res << ' '*indent
|
|
end
|
|
output << "</#{el.type}>\n"
|
|
end
|
|
alias :convert_dd :convert_li
|
|
|
|
def convert_dt(el, indent)
|
|
attr = el.attr.dup
|
|
@stack.last.options[:ial][:refs].each do |ref|
|
|
if ref =~ /\Aauto_ids(?:-([\w-]+))?/
|
|
attr['id'] = ($1 ? $1 : '') << basic_generate_id(el.options[:raw_text])
|
|
break
|
|
end
|
|
end if !attr['id'] && @stack.last.options[:ial] && @stack.last.options[:ial][:refs]
|
|
format_as_block_html(el.type, attr, inner(el, indent), indent)
|
|
end
|
|
|
|
def convert_html_element(el, indent)
|
|
res = inner(el, indent)
|
|
if el.options[:category] == :span
|
|
"<#{el.value}#{html_attributes(el.attr)}" << (res.empty? && HTML_ELEMENTS_WITHOUT_BODY.include?(el.value) ? " />" : ">#{res}</#{el.value}>")
|
|
else
|
|
output = ''
|
|
output << ' '*indent if @stack.last.type != :html_element || @stack.last.options[:content_model] != :raw
|
|
output << "<#{el.value}#{html_attributes(el.attr)}"
|
|
if el.options[:is_closed] && el.options[:content_model] == :raw
|
|
output << " />"
|
|
elsif !res.empty? && el.options[:content_model] != :block
|
|
output << ">#{res}</#{el.value}>"
|
|
elsif !res.empty?
|
|
output << ">\n#{res.chomp}\n" << ' '*indent << "</#{el.value}>"
|
|
elsif HTML_ELEMENTS_WITHOUT_BODY.include?(el.value)
|
|
output << " />"
|
|
else
|
|
output << "></#{el.value}>"
|
|
end
|
|
output << "\n" if @stack.last.type != :html_element || @stack.last.options[:content_model] != :raw
|
|
output
|
|
end
|
|
end
|
|
|
|
def convert_xml_comment(el, indent)
|
|
if el.options[:category] == :block && (@stack.last.type != :html_element || @stack.last.options[:content_model] != :raw)
|
|
' '*indent << el.value << "\n"
|
|
else
|
|
el.value
|
|
end
|
|
end
|
|
alias :convert_xml_pi :convert_xml_comment
|
|
|
|
def convert_table(el, indent)
|
|
format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
|
|
end
|
|
alias :convert_thead :convert_table
|
|
alias :convert_tbody :convert_table
|
|
alias :convert_tfoot :convert_table
|
|
alias :convert_tr :convert_table
|
|
|
|
ENTITY_NBSP = ::Kramdown::Utils::Entities.entity('nbsp') # :nodoc:
|
|
|
|
def convert_td(el, indent)
|
|
res = inner(el, indent)
|
|
type = (@stack[-2].type == :thead ? :th : :td)
|
|
attr = el.attr
|
|
alignment = @stack[-3].options[:alignment][@stack.last.children.index(el)]
|
|
if alignment != :default
|
|
attr = el.attr.dup
|
|
attr['style'] = (attr.has_key?('style') ? "#{attr['style']}; ": '') << "text-align: #{alignment}"
|
|
end
|
|
format_as_block_html(type, attr, res.empty? ? entity_to_str(ENTITY_NBSP) : res, indent)
|
|
end
|
|
|
|
def convert_comment(el, indent)
|
|
if el.options[:category] == :block
|
|
"#{' '*indent}<!-- #{el.value} -->\n"
|
|
else
|
|
"<!-- #{el.value} -->"
|
|
end
|
|
end
|
|
|
|
def convert_br(el, indent)
|
|
"<br />"
|
|
end
|
|
|
|
def convert_a(el, indent)
|
|
format_as_span_html(el.type, el.attr, inner(el, indent))
|
|
end
|
|
|
|
def convert_img(el, indent)
|
|
"<img#{html_attributes(el.attr)} />"
|
|
end
|
|
|
|
def convert_codespan(el, indent)
|
|
attr = el.attr.dup
|
|
lang = extract_code_language(attr)
|
|
hl_opts = {}
|
|
result = highlight_code(el.value, lang, :span, hl_opts)
|
|
if result
|
|
add_syntax_highlighter_to_class_attr(attr, hl_opts[:default_lang])
|
|
else
|
|
result = escape_html(el.value)
|
|
end
|
|
|
|
format_as_span_html('code', attr, result)
|
|
end
|
|
|
|
def convert_footnote(el, indent)
|
|
repeat = ''
|
|
if (footnote = @footnotes_by_name[el.options[:name]])
|
|
number = footnote[2]
|
|
repeat = ":#{footnote[3] += 1}"
|
|
else
|
|
number = @footnote_counter
|
|
@footnote_counter += 1
|
|
@footnotes << [el.options[:name], el.value, number, 0]
|
|
@footnotes_by_name[el.options[:name]] = @footnotes.last
|
|
end
|
|
"<sup id=\"fnref:#{el.options[:name]}#{repeat}\"><a href=\"#fn:#{el.options[:name]}\" class=\"footnote\">#{number}</a></sup>"
|
|
end
|
|
|
|
def convert_raw(el, indent)
|
|
if !el.options[:type] || el.options[:type].empty? || el.options[:type].include?('html')
|
|
el.value + (el.options[:category] == :block ? "\n" : '')
|
|
else
|
|
''
|
|
end
|
|
end
|
|
|
|
def convert_em(el, indent)
|
|
format_as_span_html(el.type, el.attr, inner(el, indent))
|
|
end
|
|
alias :convert_strong :convert_em
|
|
|
|
def convert_entity(el, indent)
|
|
entity_to_str(el.value, el.options[:original])
|
|
end
|
|
|
|
TYPOGRAPHIC_SYMS = {
|
|
:mdash => [::Kramdown::Utils::Entities.entity('mdash')],
|
|
:ndash => [::Kramdown::Utils::Entities.entity('ndash')],
|
|
:hellip => [::Kramdown::Utils::Entities.entity('hellip')],
|
|
:laquo_space => [::Kramdown::Utils::Entities.entity('laquo'), ::Kramdown::Utils::Entities.entity('nbsp')],
|
|
:raquo_space => [::Kramdown::Utils::Entities.entity('nbsp'), ::Kramdown::Utils::Entities.entity('raquo')],
|
|
:laquo => [::Kramdown::Utils::Entities.entity('laquo')],
|
|
:raquo => [::Kramdown::Utils::Entities.entity('raquo')]
|
|
} # :nodoc:
|
|
def convert_typographic_sym(el, indent)
|
|
if (result = @options[:typographic_symbols][el.value])
|
|
escape_html(result, :text)
|
|
else
|
|
TYPOGRAPHIC_SYMS[el.value].map {|e| entity_to_str(e)}.join('')
|
|
end
|
|
end
|
|
|
|
def convert_smart_quote(el, indent)
|
|
entity_to_str(smart_quote_entity(el))
|
|
end
|
|
|
|
def convert_math(el, indent)
|
|
if (result = format_math(el, :indent => indent))
|
|
result
|
|
else
|
|
attr = el.attr.dup
|
|
(attr['class'] = (attr['class'] || '') << " kdmath").lstrip!
|
|
if el.options[:category] == :block
|
|
format_as_block_html('div', attr, "$$\n#{el.value}\n$$", indent)
|
|
else
|
|
format_as_span_html('span', attr, "$#{el.value}$")
|
|
end
|
|
end
|
|
end
|
|
|
|
def convert_abbreviation(el, indent)
|
|
title = @root.options[:abbrev_defs][el.value]
|
|
attr = @root.options[:abbrev_attr][el.value].dup
|
|
attr['title'] = title unless title.empty?
|
|
format_as_span_html("abbr", attr, el.value)
|
|
end
|
|
|
|
def convert_root(el, indent)
|
|
result = inner(el, indent)
|
|
if @footnote_location
|
|
result.sub!(/#{@footnote_location}/, footnote_content.gsub(/\\/, "\\\\\\\\"))
|
|
else
|
|
result << footnote_content
|
|
end
|
|
if @toc_code
|
|
toc_tree = generate_toc_tree(@toc, @toc_code[0], @toc_code[1] || {})
|
|
text = if toc_tree.children.size > 0
|
|
convert(toc_tree, 0)
|
|
else
|
|
''
|
|
end
|
|
result.sub!(/#{@toc_code.last}/, text.gsub(/\\/, "\\\\\\\\"))
|
|
end
|
|
result
|
|
end
|
|
|
|
# Format the given element as span HTML.
|
|
def format_as_span_html(name, attr, body)
|
|
"<#{name}#{html_attributes(attr)}>#{body}</#{name}>"
|
|
end
|
|
|
|
# Format the given element as block HTML.
|
|
def format_as_block_html(name, attr, body, indent)
|
|
"#{' '*indent}<#{name}#{html_attributes(attr)}>#{body}</#{name}>\n"
|
|
end
|
|
|
|
# Format the given element as block HTML with a newline after the start tag and indentation
|
|
# before the end tag.
|
|
def format_as_indented_block_html(name, attr, body, indent)
|
|
"#{' '*indent}<#{name}#{html_attributes(attr)}>\n#{body}#{' '*indent}</#{name}>\n"
|
|
end
|
|
|
|
# Add the syntax highlighter name to the 'class' attribute of the given attribute hash. And
|
|
# overwrites or add a "language-LANG" part using the +lang+ parameter if +lang+ is not nil.
|
|
def add_syntax_highlighter_to_class_attr(attr, lang = nil)
|
|
(attr['class'] = (attr['class'] || '') + " highlighter-#{@options[:syntax_highlighter]}").lstrip!
|
|
attr['class'].sub!(/\blanguage-\S+|(^)/) { "language-#{lang}#{$1 ? ' ' : ''}" } if lang
|
|
end
|
|
|
|
# Generate and return an element tree for the table of contents.
|
|
def generate_toc_tree(toc, type, attr)
|
|
sections = Element.new(type, nil, attr)
|
|
sections.attr['id'] ||= 'markdown-toc'
|
|
stack = []
|
|
toc.each do |level, id, children|
|
|
li = Element.new(:li, nil, nil, {:level => level})
|
|
li.children << Element.new(:p, nil, nil, {:transparent => true})
|
|
a = Element.new(:a, nil)
|
|
a.attr['href'] = "##{id}"
|
|
a.attr['id'] = "#{sections.attr['id']}-#{id}"
|
|
a.children.concat(fix_for_toc_entry(Marshal.load(Marshal.dump(children))))
|
|
li.children.last.children << a
|
|
li.children << Element.new(type)
|
|
|
|
success = false
|
|
while !success
|
|
if stack.empty?
|
|
sections.children << li
|
|
stack << li
|
|
success = true
|
|
elsif stack.last.options[:level] < li.options[:level]
|
|
stack.last.children.last.children << li
|
|
stack << li
|
|
success = true
|
|
else
|
|
item = stack.pop
|
|
item.children.pop unless item.children.last.children.size > 0
|
|
end
|
|
end
|
|
end
|
|
while !stack.empty?
|
|
item = stack.pop
|
|
item.children.pop unless item.children.last.children.size > 0
|
|
end
|
|
sections
|
|
end
|
|
|
|
# Fixes the elements for use in a TOC entry.
|
|
def fix_for_toc_entry(elements)
|
|
remove_footnotes(elements)
|
|
unwrap_links(elements)
|
|
elements
|
|
end
|
|
|
|
# Remove all link elements by unwrapping them.
|
|
def unwrap_links(elements)
|
|
elements.map! do |c|
|
|
unwrap_links(c.children)
|
|
c.type == :a ? c.children : c
|
|
end.flatten!
|
|
end
|
|
|
|
# Remove all footnotes from the given elements.
|
|
def remove_footnotes(elements)
|
|
elements.delete_if do |c|
|
|
remove_footnotes(c.children)
|
|
c.type == :footnote
|
|
end
|
|
end
|
|
|
|
# Obfuscate the +text+ by using HTML entities.
|
|
def obfuscate(text)
|
|
result = ""
|
|
text.each_byte do |b|
|
|
result << (b > 128 ? b.chr : "&#%03d;" % b)
|
|
end
|
|
result.force_encoding(text.encoding)
|
|
result
|
|
end
|
|
|
|
FOOTNOTE_BACKLINK_FMT = "%s<a href=\"#fnref:%s\" class=\"reversefootnote\">%s</a>"
|
|
|
|
# Return a HTML ordered list with the footnote content for the used footnotes.
|
|
def footnote_content
|
|
ol = Element.new(:ol)
|
|
ol.attr['start'] = @footnote_start if @footnote_start != 1
|
|
i = 0
|
|
backlink_text = escape_html(@options[:footnote_backlink], :text)
|
|
while i < @footnotes.length
|
|
name, data, _, repeat = *@footnotes[i]
|
|
li = Element.new(:li, nil, {'id' => "fn:#{name}"})
|
|
li.children = Marshal.load(Marshal.dump(data.children))
|
|
|
|
para = nil
|
|
if li.children.last.type == :p || @options[:footnote_backlink_inline]
|
|
parent = li
|
|
while !parent.children.empty? && ![:p, :header].include?(parent.children.last.type)
|
|
parent = parent.children.last
|
|
end
|
|
para = parent.children.last
|
|
insert_space = true
|
|
end
|
|
|
|
unless para
|
|
li.children << (para = Element.new(:p))
|
|
insert_space = false
|
|
end
|
|
|
|
unless @options[:footnote_backlink].empty?
|
|
nbsp = entity_to_str(ENTITY_NBSP)
|
|
para.children << Element.new(:raw, FOOTNOTE_BACKLINK_FMT % [insert_space ? nbsp : '', name, backlink_text])
|
|
(1..repeat).each do |index|
|
|
para.children << Element.new(:raw, FOOTNOTE_BACKLINK_FMT % [nbsp, "#{name}:#{index}", "#{backlink_text}<sup>#{index+1}</sup>"])
|
|
end
|
|
end
|
|
|
|
ol.children << Element.new(:raw, convert(li, 4))
|
|
i += 1
|
|
end
|
|
(ol.children.empty? ? '' : format_as_indented_block_html('div', {:class => "footnotes"}, convert(ol, 2), 0))
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
end
|