531 lines
18 KiB
Ruby
531 lines
18 KiB
Ruby
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# -*- coding: utf-8; frozen_string_literal: true -*-
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#
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#--
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# Copyright (C) 2009-2019 Thomas Leitner <t_leitner@gmx.at>
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#
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# This file is part of kramdown which is licensed under the MIT.
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#++
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#
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require 'kramdown/parser'
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require 'kramdown/converter'
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require 'kramdown/utils'
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module Kramdown
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module Converter
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# Converts a Kramdown::Document to HTML.
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#
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# You can customize the HTML converter by sub-classing it and overriding the +convert_NAME+
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# methods. Each such method takes the following parameters:
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#
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# [+el+] The element of type +NAME+ to be converted.
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#
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# [+indent+] A number representing the current amount of spaces for indent (only used for
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# block-level elements).
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#
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# The return value of such a method has to be a string containing the element +el+ formatted as
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# HTML element.
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class Html < Base
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include ::Kramdown::Utils::Html
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include ::Kramdown::Parser::Html::Constants
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# The amount of indentation used when nesting HTML tags.
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attr_accessor :indent
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# Initialize the HTML converter with the given Kramdown document +doc+.
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def initialize(root, options)
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super
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@footnote_counter = @footnote_start = @options[:footnote_nr]
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@footnotes = []
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@footnotes_by_name = {}
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@footnote_location = nil
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@toc = []
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@toc_code = nil
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@indent = 2
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@stack = []
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end
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# The mapping of element type to conversion method.
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DISPATCHER = Hash.new {|h, k| h[k] = "convert_#{k}" }
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# Dispatch the conversion of the element +el+ to a +convert_TYPE+ method using the +type+ of
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# the element.
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def convert(el, indent = -@indent)
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send(DISPATCHER[el.type], el, indent)
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end
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# Return the converted content of the children of +el+ as a string. The parameter +indent+ has
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# to be the amount of indentation used for the element +el+.
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#
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# Pushes +el+ onto the @stack before converting the child elements and pops it from the stack
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# afterwards.
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def inner(el, indent)
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result = +''
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indent += @indent
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@stack.push(el)
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el.children.each do |inner_el|
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result << send(DISPATCHER[inner_el.type], inner_el, indent)
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end
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@stack.pop
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result
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end
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def convert_blank(_el, _indent)
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"\n"
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end
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def convert_text(el, _indent)
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escape_html(el.value, :text)
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end
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def convert_p(el, indent)
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if el.options[:transparent]
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inner(el, indent)
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elsif el.children.size == 1 && el.children.first.type == :img &&
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el.children.first.options[:ial]&.[](:refs)&.include?('standalone')
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convert_standalone_image(el.children.first, indent)
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else
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format_as_block_html(el.type, el.attr, inner(el, indent), indent)
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end
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end
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# Helper method used by +convert_p+ to convert a paragraph that only contains a single :img
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# element.
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def convert_standalone_image(el, indent)
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attr = el.attr.dup
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figure_attr = {}
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figure_attr['class'] = attr.delete('class') if attr.key?('class')
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figure_attr['id'] = attr.delete('id') if attr.key?('id')
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body = "#{' ' * (indent + @indent)}<img#{html_attributes(attr)} />\n" \
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"#{' ' * (indent + @indent)}<figcaption>#{attr['alt']}</figcaption>\n"
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format_as_indented_block_html("figure", figure_attr, body, indent)
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end
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def convert_codeblock(el, indent)
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attr = el.attr.dup
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lang = extract_code_language!(attr)
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hl_opts = {}
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highlighted_code = highlight_code(el.value, el.options[:lang] || lang, :block, hl_opts)
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if highlighted_code
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add_syntax_highlighter_to_class_attr(attr, lang || hl_opts[:default_lang])
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"#{' ' * indent}<div#{html_attributes(attr)}>#{highlighted_code}#{' ' * indent}</div>\n"
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else
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result = escape_html(el.value)
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result.chomp!
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if el.attr['class'].to_s =~ /\bshow-whitespaces\b/
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result.gsub!(/(?:(^[ \t]+)|([ \t]+$)|([ \t]+))/) do |m|
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suffix = ($1 ? '-l' : ($2 ? '-r' : ''))
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m.scan(/./).map do |c|
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case c
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when "\t" then "<span class=\"ws-tab#{suffix}\">\t</span>"
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when " " then "<span class=\"ws-space#{suffix}\">⋅</span>"
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end
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end.join('')
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end
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end
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code_attr = {}
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code_attr['class'] = "language-#{lang}" if lang
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"#{' ' * indent}<pre#{html_attributes(attr)}>" \
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"<code#{html_attributes(code_attr)}>#{result}\n</code></pre>\n"
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end
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end
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def convert_blockquote(el, indent)
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format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
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end
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def convert_header(el, indent)
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attr = el.attr.dup
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if @options[:auto_ids] && !attr['id']
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attr['id'] = generate_id(el.options[:raw_text])
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end
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@toc << [el.options[:level], attr['id'], el.children] if attr['id'] && in_toc?(el)
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level = output_header_level(el.options[:level])
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format_as_block_html("h#{level}", attr, inner(el, indent), indent)
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end
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def convert_hr(el, indent)
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"#{' ' * indent}<hr#{html_attributes(el.attr)} />\n"
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end
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def convert_ul(el, indent)
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if !@toc_code && (el.options[:ial][:refs].include?('toc') rescue nil)
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@toc_code = [el.type, el.attr, (0..128).to_a.map { rand(36).to_s(36) }.join]
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@toc_code.last
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elsif !@footnote_location && el.options[:ial] && (el.options[:ial][:refs] || []).include?('footnotes')
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@footnote_location = (0..128).to_a.map { rand(36).to_s(36) }.join
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else
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format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
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end
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end
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alias convert_ol convert_ul
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def convert_dl(el, indent)
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format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
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end
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def convert_li(el, indent)
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output = ' ' * indent << "<#{el.type}" << html_attributes(el.attr) << ">"
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res = inner(el, indent)
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if el.children.empty? || (el.children.first.type == :p && el.children.first.options[:transparent])
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output << res << (res =~ /\n\Z/ ? ' ' * indent : '')
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else
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output << "\n" << res << ' ' * indent
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end
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output << "</#{el.type}>\n"
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end
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alias convert_dd convert_li
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def convert_dt(el, indent)
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attr = el.attr.dup
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@stack.last.options[:ial][:refs].each do |ref|
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if ref =~ /\Aauto_ids(?:-([\w-]+))?/
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attr['id'] = "#{$1}#{basic_generate_id(el.options[:raw_text])}".lstrip
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break
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end
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end if !attr['id'] && @stack.last.options[:ial] && @stack.last.options[:ial][:refs]
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format_as_block_html(el.type, attr, inner(el, indent), indent)
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end
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def convert_html_element(el, indent)
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res = inner(el, indent)
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if el.options[:category] == :span
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"<#{el.value}#{html_attributes(el.attr)}" + \
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(res.empty? && HTML_ELEMENTS_WITHOUT_BODY.include?(el.value) ? " />" : ">#{res}</#{el.value}>")
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else
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output = +''
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if @stack.last.type != :html_element || @stack.last.options[:content_model] != :raw
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output << ' ' * indent
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end
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output << "<#{el.value}#{html_attributes(el.attr)}"
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if el.options[:is_closed] && el.options[:content_model] == :raw
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output << " />"
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elsif !res.empty? && el.options[:content_model] != :block
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output << ">#{res}</#{el.value}>"
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elsif !res.empty?
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output << ">\n#{res.chomp}\n" << ' ' * indent << "</#{el.value}>"
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elsif HTML_ELEMENTS_WITHOUT_BODY.include?(el.value)
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output << " />"
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else
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output << "></#{el.value}>"
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end
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output << "\n" if @stack.last.type != :html_element || @stack.last.options[:content_model] != :raw
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output
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end
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end
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def convert_xml_comment(el, indent)
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if el.options[:category] == :block &&
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(@stack.last.type != :html_element || @stack.last.options[:content_model] != :raw)
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' ' * indent << el.value << "\n"
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else
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el.value
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end
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end
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alias convert_xml_pi convert_xml_comment
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def convert_table(el, indent)
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format_as_indented_block_html(el.type, el.attr, inner(el, indent), indent)
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end
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alias convert_thead convert_table
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alias convert_tbody convert_table
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alias convert_tfoot convert_table
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alias convert_tr convert_table
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ENTITY_NBSP = ::Kramdown::Utils::Entities.entity('nbsp') # :nodoc:
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def convert_td(el, indent)
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res = inner(el, indent)
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type = (@stack[-2].type == :thead ? :th : :td)
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attr = el.attr
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alignment = @stack[-3].options[:alignment][@stack.last.children.index(el)]
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if alignment != :default
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attr = el.attr.dup
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attr['style'] = (attr.key?('style') ? "#{attr['style']}; " : '') + "text-align: #{alignment}"
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end
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format_as_block_html(type, attr, res.empty? ? entity_to_str(ENTITY_NBSP) : res, indent)
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end
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def convert_comment(el, indent)
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if el.options[:category] == :block
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"#{' ' * indent}<!-- #{el.value} -->\n"
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else
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"<!-- #{el.value} -->"
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end
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end
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def convert_br(_el, _indent)
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"<br />"
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end
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def convert_a(el, indent)
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format_as_span_html(el.type, el.attr, inner(el, indent))
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end
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def convert_img(el, _indent)
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"<img#{html_attributes(el.attr)} />"
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end
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def convert_codespan(el, _indent)
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attr = el.attr.dup
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lang = extract_code_language(attr)
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hl_opts = {}
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result = highlight_code(el.value, lang, :span, hl_opts)
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if result
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add_syntax_highlighter_to_class_attr(attr, hl_opts[:default_lang])
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else
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result = escape_html(el.value)
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end
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format_as_span_html('code', attr, result)
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end
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def convert_footnote(el, _indent)
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repeat = ''
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name = @options[:footnote_prefix] + el.options[:name]
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if (footnote = @footnotes_by_name[name])
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number = footnote[2]
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repeat = ":#{footnote[3] += 1}"
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else
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number = @footnote_counter
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@footnote_counter += 1
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@footnotes << [name, el.value, number, 0]
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@footnotes_by_name[name] = @footnotes.last
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end
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"<sup id=\"fnref:#{name}#{repeat}\">" \
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"<a href=\"#fn:#{name}\" class=\"footnote\">" \
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"#{number}</a></sup>"
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end
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def convert_raw(el, _indent)
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if !el.options[:type] || el.options[:type].empty? || el.options[:type].include?('html')
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el.value + (el.options[:category] == :block ? "\n" : '')
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else
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''
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end
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end
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def convert_em(el, indent)
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format_as_span_html(el.type, el.attr, inner(el, indent))
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end
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alias convert_strong convert_em
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def convert_entity(el, _indent)
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entity_to_str(el.value, el.options[:original])
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end
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TYPOGRAPHIC_SYMS = {
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mdash: [::Kramdown::Utils::Entities.entity('mdash')],
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ndash: [::Kramdown::Utils::Entities.entity('ndash')],
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hellip: [::Kramdown::Utils::Entities.entity('hellip')],
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laquo_space: [::Kramdown::Utils::Entities.entity('laquo'),
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::Kramdown::Utils::Entities.entity('nbsp')],
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raquo_space: [::Kramdown::Utils::Entities.entity('nbsp'),
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::Kramdown::Utils::Entities.entity('raquo')],
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laquo: [::Kramdown::Utils::Entities.entity('laquo')],
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raquo: [::Kramdown::Utils::Entities.entity('raquo')],
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} # :nodoc:
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def convert_typographic_sym(el, _indent)
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if (result = @options[:typographic_symbols][el.value])
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escape_html(result, :text)
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else
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TYPOGRAPHIC_SYMS[el.value].map {|e| entity_to_str(e) }.join('')
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end
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end
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def convert_smart_quote(el, _indent)
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entity_to_str(smart_quote_entity(el))
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end
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def convert_math(el, indent)
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if (result = format_math(el, indent: indent))
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result
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else
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attr = el.attr.dup
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attr['class'] = "#{attr['class']} kdmath".lstrip
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|
|
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.empty?
|
||
|
|
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.dup)
|
||
|
|
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
|
||
|
|
until 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 if item.children.last.children.empty?
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
until stack.empty?
|
||
|
|
item = stack.pop
|
||
|
|
item.children.pop if item.children.last.children.empty?
|
||
|
|
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 : sprintf("&#%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)
|
||
|
|
value = sprintf(FOOTNOTE_BACKLINK_FMT, (insert_space ? nbsp : ''), name, backlink_text)
|
||
|
|
para.children << Element.new(:raw, value)
|
||
|
|
(1..repeat).each do |index|
|
||
|
|
value = sprintf(FOOTNOTE_BACKLINK_FMT, nbsp, "#{name}:#{index}",
|
||
|
|
"#{backlink_text}<sup>#{index + 1}</sup>")
|
||
|
|
para.children << Element.new(:raw, value)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
ol.children << Element.new(:raw, convert(li, 4))
|
||
|
|
i += 1
|
||
|
|
end
|
||
|
|
if ol.children.empty?
|
||
|
|
''
|
||
|
|
else
|
||
|
|
format_as_indented_block_html('div', {class: "footnotes"}, convert(ol, 2), 0)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
end
|
||
|
|
|
||
|
|
end
|
||
|
|
end
|