This commit is contained in:
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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 'set'
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require 'kramdown/converter'
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module Kramdown
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module Converter
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# Converts an element tree to LaTeX.
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#
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# This converter uses ideas from other Markdown-to-LaTeX converters like Pandoc and Maruku.
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#
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# You can customize this converter by sub-classing it and overriding the +convert_NAME+ methods.
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# 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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# [+opts+] A hash containing processing options that are passed down from parent elements. The
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# key :parent is always set and contains the parent element as value.
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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
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# correctly as LaTeX markup.
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class Latex < Base
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# Initialize the LaTeX converter with the +root+ element and the conversion +options+.
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def initialize(root, options)
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super
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@data[:packages] = Set.new
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end
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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, opts = {})
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send("convert_#{el.type}", el, opts)
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end
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# Return the converted content of the children of +el+ as a string.
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def inner(el, opts)
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result = +''
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options = opts.dup.merge(parent: el)
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el.children.each_with_index do |inner_el, index|
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options[:index] = index
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options[:result] = result
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result << send("convert_#{inner_el.type}", inner_el, options)
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end
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result
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end
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def convert_root(el, opts)
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inner(el, opts)
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end
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def convert_blank(_el, opts)
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opts[:result].match?(/\n\n\Z|\A\Z/) ? "" : "\n"
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end
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def convert_text(el, _opts)
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escape(el.value)
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end
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def convert_p(el, opts)
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if el.children.size == 1 && el.children.first.type == :img &&
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!(img = convert_img(el.children.first, opts)).empty?
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convert_standalone_image(el, opts, img)
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else
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"#{latex_link_target(el)}#{inner(el, opts)}\n\n"
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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, _opts, img)
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attrs = attribute_list(el)
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"\\begin{figure}#{attrs}\n\\begin{center}\n#{img}\n\\end{center}\n" \
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"\\caption{#{escape(el.children.first.attr['alt'])}}\n" \
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"#{latex_link_target(el, true)}\n\\end{figure}#{attrs}\n"
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end
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def convert_codeblock(el, _opts)
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show_whitespace = el.attr['class'].to_s =~ /\bshow-whitespaces\b/
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lang = extract_code_language(el.attr)
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if @options[:syntax_highlighter] == :minted &&
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(highlighted_code = highlight_code(el.value, lang, :block))
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@data[:packages] << 'minted'
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"#{latex_link_target(el)}#{highlighted_code}\n"
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elsif show_whitespace || lang
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options = []
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options << (show_whitespace ? "showspaces=true,showtabs=true" : "showspaces=false,showtabs=false")
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options << "language=#{lang}" if lang
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options << "basicstyle=\\ttfamily\\footnotesize,columns=fixed,frame=tlbr"
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id = el.attr['id']
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options << "label=#{id}" if id
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attrs = attribute_list(el)
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"#{latex_link_target(el)}\\begin{lstlisting}[#{options.join(',')}]\n" \
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"#{el.value}\n\\end{lstlisting}#{attrs}\n"
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else
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"#{latex_link_target(el)}\\begin{verbatim}#{el.value}\\end{verbatim}\n"
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end
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end
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def convert_blockquote(el, opts)
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latex_environment(el.children.size > 1 ? 'quotation' : 'quote', el, inner(el, opts))
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end
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def convert_header(el, opts)
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type = @options[:latex_headers][output_header_level(el.options[:level]) - 1]
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if ((id = el.attr['id']) ||
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(@options[:auto_ids] && (id = generate_id(el.options[:raw_text])))) && in_toc?(el)
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"\\#{type}{#{inner(el, opts)}}\\hypertarget{#{id}}{}\\label{#{id}}\n\n"
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else
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"\\#{type}*{#{inner(el, opts)}}\n\n"
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end
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end
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def convert_hr(el, _opts)
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attrs = attribute_list(el)
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"#{latex_link_target(el)}\\begin{center}#{attrs}\n\\rule{3in}{0.4pt}\n\\end{center}#{attrs}\n"
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end
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def convert_ul(el, opts)
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if !@data[:has_toc] && el.options.dig(:ial, :refs)&.include?('toc')
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@data[:has_toc] = true
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'\tableofcontents'
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else
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latex_environment(el.type == :ul ? 'itemize' : 'enumerate', el, inner(el, opts))
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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, opts)
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latex_environment('description', el, inner(el, opts))
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end
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def convert_li(el, opts)
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"\\item{} #{latex_link_target(el, true)}#{inner(el, opts).sub(/\n+\Z/, '')}\n"
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end
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def convert_dt(el, opts)
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"\\item[#{inner(el, opts)}] "
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end
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def convert_dd(el, opts)
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"#{latex_link_target(el)}#{inner(el, opts)}\n\n"
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end
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def convert_html_element(el, opts)
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case el.value
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when 'i', 'em'
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"\\emph{#{inner(el, opts)}}"
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when 'b', 'strong'
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"\\textbf{#{inner(el, opts)}}"
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else
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warning("Can't convert HTML element")
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''
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end
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end
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def convert_xml_comment(el, _opts)
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el.value.split("\n").map {|l| "% #{l}" }.join("\n") + "\n"
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end
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def convert_xml_pi(_el, _opts)
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warning("Can't convert XML PI")
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''
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end
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TABLE_ALIGNMENT_CHAR = {default: 'l', left: 'l', center: 'c', right: 'r'} # :nodoc:
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def convert_table(el, opts)
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@data[:packages] << 'longtable'
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align = el.options[:alignment].map {|a| TABLE_ALIGNMENT_CHAR[a] }.join('|')
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attrs = attribute_list(el)
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"#{latex_link_target(el)}\\begin{longtable}{|#{align}|}#{attrs}\n" \
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"\\hline\n#{inner(el, opts)}\\hline\n\\end{longtable}#{attrs}\n\n"
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end
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def convert_thead(el, opts)
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"#{inner(el, opts)}\\hline\n"
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end
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def convert_tbody(el, opts)
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inner(el, opts)
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end
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def convert_tfoot(el, opts)
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"\\hline \\hline \n#{inner(el, opts)}"
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end
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def convert_tr(el, opts)
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el.children.map {|c| send("convert_#{c.type}", c, opts) }.join(' & ') << "\\\\\n"
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end
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def convert_td(el, opts)
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inner(el, opts)
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end
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def convert_comment(el, _opts)
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el.value.split("\n").map {|l| "% #{l}" }.join("\n") << "\n"
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end
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def convert_br(_el, opts)
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res = +"\\newline"
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res << "\n" if (c = opts[:parent].children[opts[:index] + 1]) &&
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(c.type != :text || c.value !~ /^\s*\n/)
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res
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end
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def convert_a(el, opts)
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url = el.attr['href']
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if url.start_with?('#')
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"\\hyperlink{#{url[1..-1].gsub('%', '\\%')}}{#{inner(el, opts)}}"
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else
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"\\href{#{url.gsub('%', '\\%')}}{#{inner(el, opts)}}"
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end
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end
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def convert_img(el, _opts)
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line = el.options[:location]
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if el.attr['src'].match?(/^(https?|ftps?):\/\//)
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warning("Cannot include non-local image#{line ? " (line #{line})" : ''}")
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''
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elsif !el.attr['src'].empty?
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@data[:packages] << 'graphicx'
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"#{latex_link_target(el)}\\includegraphics{#{el.attr['src']}}"
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else
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warning("Cannot include image with empty path#{line ? " (line #{line})" : ''}")
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''
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end
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end
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def convert_codespan(el, _opts)
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lang = extract_code_language(el.attr)
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if @options[:syntax_highlighter] == :minted &&
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(highlighted_code = highlight_code(el.value, lang, :span))
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@data[:packages] << 'minted'
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"#{latex_link_target(el)}#{highlighted_code}"
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else
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"\\texttt{#{latex_link_target(el)}#{escape(el.value)}}"
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end
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end
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def convert_footnote(el, opts)
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@data[:packages] << 'fancyvrb'
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"\\footnote{#{inner(el.value, opts).rstrip}}"
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end
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def convert_raw(el, _opts)
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if !el.options[:type] || el.options[:type].empty? || el.options[:type].include?('latex')
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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, opts)
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"\\emph{#{latex_link_target(el)}#{inner(el, opts)}}"
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end
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def convert_strong(el, opts)
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"\\textbf{#{latex_link_target(el)}#{inner(el, opts)}}"
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end
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# Inspired by Maruku: entity conversion table based on the one from htmltolatex
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# (http://sourceforge.net/projects/htmltolatex/), with some small adjustments/additions
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ENTITY_CONV_TABLE = {
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913 => ['$A$'],
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914 => ['$B$'],
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915 => ['$\Gamma$'],
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916 => ['$\Delta$'],
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917 => ['$E$'],
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918 => ['$Z$'],
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919 => ['$H$'],
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920 => ['$\Theta$'],
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921 => ['$I$'],
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922 => ['$K$'],
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923 => ['$\Lambda$'],
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924 => ['$M$'],
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925 => ['$N$'],
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926 => ['$\Xi$'],
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927 => ['$O$'],
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928 => ['$\Pi$'],
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929 => ['$P$'],
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931 => ['$\Sigma$'],
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932 => ['$T$'],
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933 => ['$Y$'],
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934 => ['$\Phi$'],
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935 => ['$X$'],
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936 => ['$\Psi$'],
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937 => ['$\Omega$'],
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945 => ['$\alpha$'],
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946 => ['$\beta$'],
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947 => ['$\gamma$'],
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948 => ['$\delta$'],
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949 => ['$\epsilon$'],
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950 => ['$\zeta$'],
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951 => ['$\eta$'],
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952 => ['$\theta$'],
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953 => ['$\iota$'],
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954 => ['$\kappa$'],
|
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955 => ['$\lambda$'],
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956 => ['$\mu$'],
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957 => ['$\nu$'],
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958 => ['$\xi$'],
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959 => ['$o$'],
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960 => ['$\pi$'],
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961 => ['$\rho$'],
|
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963 => ['$\sigma$'],
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964 => ['$\tau$'],
|
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965 => ['$\upsilon$'],
|
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966 => ['$\phi$'],
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967 => ['$\chi$'],
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968 => ['$\psi$'],
|
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969 => ['$\omega$'],
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962 => ['$\varsigma$'],
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977 => ['$\vartheta$'],
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982 => ['$\varpi$'],
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8230 => ['\ldots'],
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8242 => ['$\prime$'],
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8254 => ['-'],
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8260 => ['/'],
|
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8472 => ['$\wp$'],
|
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8465 => ['$\Im$'],
|
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8476 => ['$\Re$'],
|
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8501 => ['$\aleph$'],
|
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8226 => ['$\bullet$'],
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8482 => ['$^{\rm TM}$'],
|
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8592 => ['$\leftarrow$'],
|
||||
8594 => ['$\rightarrow$'],
|
||||
8593 => ['$\uparrow$'],
|
||||
8595 => ['$\downarrow$'],
|
||||
8596 => ['$\leftrightarrow$'],
|
||||
8629 => ['$\hookleftarrow$'],
|
||||
8657 => ['$\Uparrow$'],
|
||||
8659 => ['$\Downarrow$'],
|
||||
8656 => ['$\Leftarrow$'],
|
||||
8658 => ['$\Rightarrow$'],
|
||||
8660 => ['$\Leftrightarrow$'],
|
||||
8704 => ['$\forall$'],
|
||||
8706 => ['$\partial$'],
|
||||
8707 => ['$\exists$'],
|
||||
8709 => ['$\emptyset$'],
|
||||
8711 => ['$\nabla$'],
|
||||
8712 => ['$\in$'],
|
||||
8715 => ['$\ni$'],
|
||||
8713 => ['$\notin$'],
|
||||
8721 => ['$\sum$'],
|
||||
8719 => ['$\prod$'],
|
||||
8722 => ['$-$'],
|
||||
8727 => ['$\ast$'],
|
||||
8730 => ['$\surd$'],
|
||||
8733 => ['$\propto$'],
|
||||
8734 => ['$\infty$'],
|
||||
8736 => ['$\angle$'],
|
||||
8743 => ['$\wedge$'],
|
||||
8744 => ['$\vee$'],
|
||||
8745 => ['$\cap$'],
|
||||
8746 => ['$\cup$'],
|
||||
8747 => ['$\int$'],
|
||||
8756 => ['$\therefore$', 'amssymb'],
|
||||
8764 => ['$\sim$'],
|
||||
8776 => ['$\approx$'],
|
||||
8773 => ['$\cong$'],
|
||||
8800 => ['$\neq$'],
|
||||
8801 => ['$\equiv$'],
|
||||
8804 => ['$\leq$'],
|
||||
8805 => ['$\geq$'],
|
||||
8834 => ['$\subset$'],
|
||||
8835 => ['$\supset$'],
|
||||
8838 => ['$\subseteq$'],
|
||||
8839 => ['$\supseteq$'],
|
||||
8836 => ['$\nsubset$', 'amssymb'],
|
||||
8853 => ['$\oplus$'],
|
||||
8855 => ['$\otimes$'],
|
||||
8869 => ['$\perp$'],
|
||||
8901 => ['$\cdot$'],
|
||||
8968 => ['$\rceil$'],
|
||||
8969 => ['$\lceil$'],
|
||||
8970 => ['$\lfloor$'],
|
||||
8971 => ['$\rfloor$'],
|
||||
9001 => ['$\rangle$'],
|
||||
9002 => ['$\langle$'],
|
||||
9674 => ['$\lozenge$', 'amssymb'],
|
||||
9824 => ['$\spadesuit$'],
|
||||
9827 => ['$\clubsuit$'],
|
||||
9829 => ['$\heartsuit$'],
|
||||
9830 => ['$\diamondsuit$'],
|
||||
38 => ['\&'],
|
||||
34 => ['"'],
|
||||
39 => ['\''],
|
||||
169 => ['\copyright'],
|
||||
60 => ['\textless'],
|
||||
62 => ['\textgreater'],
|
||||
338 => ['\OE'],
|
||||
339 => ['\oe'],
|
||||
352 => ['\v{S}'],
|
||||
353 => ['\v{s}'],
|
||||
376 => ['\"Y'],
|
||||
710 => ['\textasciicircum'],
|
||||
732 => ['\textasciitilde'],
|
||||
8211 => ['--'],
|
||||
8212 => ['---'],
|
||||
8216 => ['`'],
|
||||
8217 => ['\''],
|
||||
8220 => ['``'],
|
||||
8221 => ['\'\''],
|
||||
8224 => ['\dag'],
|
||||
8225 => ['\ddag'],
|
||||
8240 => ['\permil', 'wasysym'],
|
||||
8364 => ['\euro', 'eurosym'],
|
||||
8249 => ['\guilsinglleft'],
|
||||
8250 => ['\guilsinglright'],
|
||||
8218 => ['\quotesinglbase', 'mathcomp'],
|
||||
8222 => ['\quotedblbase', 'mathcomp'],
|
||||
402 => ['\textflorin', 'mathcomp'],
|
||||
381 => ['\v{Z}'],
|
||||
382 => ['\v{z}'],
|
||||
160 => ['~'],
|
||||
161 => ['\textexclamdown'],
|
||||
163 => ['\pounds'],
|
||||
164 => ['\currency', 'wasysym'],
|
||||
165 => ['\textyen', 'textcomp'],
|
||||
166 => ['\brokenvert', 'wasysym'],
|
||||
167 => ['\S'],
|
||||
171 => ['\guillemotleft'],
|
||||
187 => ['\guillemotright'],
|
||||
174 => ['\textregistered'],
|
||||
170 => ['\textordfeminine'],
|
||||
172 => ['$\neg$'],
|
||||
173 => ['\-'],
|
||||
176 => ['$\degree$', 'mathabx'],
|
||||
177 => ['$\pm$'],
|
||||
180 => ['\''],
|
||||
181 => ['$\mu$'],
|
||||
182 => ['\P'],
|
||||
183 => ['$\cdot$'],
|
||||
186 => ['\textordmasculine'],
|
||||
162 => ['\cent', 'wasysym'],
|
||||
185 => ['$^1$'],
|
||||
178 => ['$^2$'],
|
||||
179 => ['$^3$'],
|
||||
189 => ['$\frac{1}{2}$'],
|
||||
188 => ['$\frac{1}{4}$'],
|
||||
190 => ['$\frac{3}{4}'],
|
||||
192 => ['\`A'],
|
||||
193 => ['\\\'A'],
|
||||
194 => ['\^A'],
|
||||
195 => ['\~A'],
|
||||
196 => ['\"A'],
|
||||
197 => ['\AA'],
|
||||
198 => ['\AE'],
|
||||
199 => ['\cC'],
|
||||
200 => ['\`E'],
|
||||
201 => ['\\\'E'],
|
||||
202 => ['\^E'],
|
||||
203 => ['\"E'],
|
||||
204 => ['\`I'],
|
||||
205 => ['\\\'I'],
|
||||
206 => ['\^I'],
|
||||
207 => ['\"I'],
|
||||
208 => ['$\eth$', 'amssymb'],
|
||||
209 => ['\~N'],
|
||||
210 => ['\`O'],
|
||||
211 => ['\\\'O'],
|
||||
212 => ['\^O'],
|
||||
213 => ['\~O'],
|
||||
214 => ['\"O'],
|
||||
215 => ['$\times$'],
|
||||
216 => ['\O'],
|
||||
217 => ['\`U'],
|
||||
218 => ['\\\'U'],
|
||||
219 => ['\^U'],
|
||||
220 => ['\"U'],
|
||||
221 => ['\\\'Y'],
|
||||
222 => ['\Thorn', 'wasysym'],
|
||||
223 => ['\ss'],
|
||||
224 => ['\`a'],
|
||||
225 => ['\\\'a'],
|
||||
226 => ['\^a'],
|
||||
227 => ['\~a'],
|
||||
228 => ['\"a'],
|
||||
229 => ['\aa'],
|
||||
230 => ['\ae'],
|
||||
231 => ['\cc'],
|
||||
232 => ['\`e'],
|
||||
233 => ['\\\'e'],
|
||||
234 => ['\^e'],
|
||||
235 => ['\"e'],
|
||||
236 => ['\`i'],
|
||||
237 => ['\\\'i'],
|
||||
238 => ['\^i'],
|
||||
239 => ['\"i'],
|
||||
240 => ['$\eth$'],
|
||||
241 => ['\~n'],
|
||||
242 => ['\`o'],
|
||||
243 => ['\\\'o'],
|
||||
244 => ['\^o'],
|
||||
245 => ['\~o'],
|
||||
246 => ['\"o'],
|
||||
247 => ['$\divide$'],
|
||||
248 => ['\o'],
|
||||
249 => ['\`u'],
|
||||
250 => ['\\\'u'],
|
||||
251 => ['\^u'],
|
||||
252 => ['\"u'],
|
||||
253 => ['\\\'y'],
|
||||
254 => ['\thorn', 'wasysym'],
|
||||
255 => ['\"y'],
|
||||
8201 => ['\thinspace'],
|
||||
8194 => ['\hskip .5em\relax'],
|
||||
8195 => ['\quad'],
|
||||
} # :nodoc:
|
||||
ENTITY_CONV_TABLE.each_value {|v| v[0] = "#{v[0]}{}" }
|
||||
|
||||
def entity_to_latex(entity)
|
||||
text, package = ENTITY_CONV_TABLE[entity.code_point]
|
||||
if text
|
||||
@data[:packages] << package if package
|
||||
text
|
||||
else
|
||||
warning("Couldn't find entity with code #{entity.code_point} in substitution table!")
|
||||
''
|
||||
end
|
||||
end
|
||||
|
||||
def convert_entity(el, _opts)
|
||||
entity_to_latex(el.value)
|
||||
end
|
||||
|
||||
TYPOGRAPHIC_SYMS = {
|
||||
mdash: '---', ndash: '--', hellip: '\ldots{}',
|
||||
laquo_space: '\guillemotleft{}~', raquo_space: '~\guillemotright{}',
|
||||
laquo: '\guillemotleft{}', raquo: '\guillemotright{}'
|
||||
} # :nodoc:
|
||||
def convert_typographic_sym(el, _opts)
|
||||
if (result = @options[:typographic_symbols][el.value])
|
||||
escape(result)
|
||||
else
|
||||
TYPOGRAPHIC_SYMS[el.value]
|
||||
end
|
||||
end
|
||||
|
||||
def convert_smart_quote(el, opts)
|
||||
res = entity_to_latex(smart_quote_entity(el)).chomp('{}')
|
||||
res << "{}" if ((nel = opts[:parent].children[opts[:index] + 1]) && nel.type == :smart_quote) || res =~ /\w$/
|
||||
res
|
||||
end
|
||||
|
||||
def convert_math(el, _opts)
|
||||
@data[:packages] += %w[amssymb amsmath amsthm amsfonts]
|
||||
if el.options[:category] == :block
|
||||
if el.value.match?(/\A\s*\\begin\{/)
|
||||
el.value
|
||||
else
|
||||
latex_environment('displaymath', el, el.value)
|
||||
end
|
||||
else
|
||||
"$#{el.value}$"
|
||||
end
|
||||
end
|
||||
|
||||
def convert_abbreviation(el, _opts)
|
||||
@data[:packages] += %w[acronym]
|
||||
"\\ac{#{normalize_abbreviation_key(el.value)}}"
|
||||
end
|
||||
|
||||
# Normalize the abbreviation key so that it only contains allowed ASCII character
|
||||
def normalize_abbreviation_key(key)
|
||||
key.gsub(/\W/) {|m| m.unpack1('H*') }
|
||||
end
|
||||
|
||||
# Wrap the +text+ inside a LaTeX environment of type +type+. The element +el+ is passed on to
|
||||
# the method #attribute_list -- the resulting string is appended to both the \\begin and the
|
||||
# \\end lines of the LaTeX environment for easier post-processing of LaTeX environments.
|
||||
def latex_environment(type, el, text)
|
||||
attrs = attribute_list(el)
|
||||
"\\begin{#{type}}#{latex_link_target(el)}#{attrs}\n#{text.rstrip}\n\\end{#{type}}#{attrs}\n"
|
||||
end
|
||||
|
||||
# Return a string containing a valid \hypertarget command if the element has an ID defined, or
|
||||
# +nil+ otherwise. If the parameter +add_label+ is +true+, a \label command will also be used
|
||||
# additionally to the \hypertarget command.
|
||||
def latex_link_target(el, add_label = false)
|
||||
if (id = el.attr['id'])
|
||||
"\\hypertarget{#{id}}{}#{add_label ? "\\label{#{id}}" : ''}"
|
||||
else
|
||||
nil
|
||||
end
|
||||
end
|
||||
|
||||
# Return a LaTeX comment containing all attributes as 'key="value"' pairs.
|
||||
def attribute_list(el)
|
||||
attrs = el.attr.map {|k, v| v.nil? ? '' : " #{k}=\"#{v}\"" }.compact.sort.join
|
||||
attrs = " % #{attrs}" unless attrs.empty?
|
||||
attrs
|
||||
end
|
||||
|
||||
ESCAPE_MAP = {
|
||||
"^" => "\\^{}",
|
||||
"\\" => "\\textbackslash{}",
|
||||
"~" => "\\ensuremath{\\sim}",
|
||||
"|" => "\\textbar{}",
|
||||
"<" => "\\textless{}",
|
||||
">" => "\\textgreater{}",
|
||||
"[" => "{[}",
|
||||
"]" => "{]}",
|
||||
}.merge(Hash[*"{}$%&_#".each_char.map {|c| [c, "\\#{c}"] }.flatten]) # :nodoc:
|
||||
ESCAPE_RE = Regexp.union(*ESCAPE_MAP.collect {|k, _v| k }) # :nodoc:
|
||||
|
||||
# Escape the special LaTeX characters in the string +str+.
|
||||
def escape(str)
|
||||
str.gsub(ESCAPE_RE) {|m| ESCAPE_MAP[m] }
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
end
|
||||
end
|
||||
Reference in New Issue
Block a user