Module: Polytexnic::Utils
Instance Method Summary collapse
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#add_font_info(string) ⇒ Object
Adds some verbatim font info (including size).
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#cache_hrefs(doc, latex = false) ⇒ Object
Caches URLs for href commands.
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#debug? ⇒ Boolean
Returns true if we are debugging, false otherwise.
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#digest(string, options = {}) ⇒ Object
Returns a salted hash digest of the string.
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#escape_backslashes(string) ⇒ Object
Escapes backslashes.
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#framed(code) ⇒ Object
Puts a frame around code.
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#highlight(key, content, language, formatter, options) ⇒ Object
Highlights a code sample.
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#highlight_lines(output, options) ⇒ Object
Highlight lines (i.e., with a yellow backgroun).
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#highlight_source_code(document) ⇒ Object
Highlights source code.
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#highlighted_lines(options) ⇒ Object
Returns an array with the highlighted lines.
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#horrible_backslash_kludge(string) ⇒ Object
Does something horrible with backslashes.
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#linux? ⇒ Boolean
Returns true if platform is Linux.
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#os_x? ⇒ Boolean
Returns true if platform is OS X.
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#os_x_newer? ⇒ Boolean
Returns true for OS X Mountain Lion (10.8) and later.
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#os_x_older? ⇒ Boolean
Returns true for OS X Lion (10.7) and earlier.
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#pipeline_digest(element) ⇒ Object
Returns a digest for passing things through the pipeline.
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#profiling? ⇒ Boolean
Returns true if we are profiling the code, false otherwise.
- #set_test_mode! ⇒ Object
- #test? ⇒ Boolean
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#tralics ⇒ Object
Returns the executable for the Tralics LaTeX-to-XML converter.
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#tralics_commands ⇒ Object
Returns some commands for Tralics.
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#underscore_digest ⇒ Object
Returns a digest for use in labels.
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#xmlelement(name, skip = false) ⇒ Object
Returns a Tralics pseudo-LaTeX XML element.
Instance Method Details
#add_font_info(string) ⇒ Object
Adds some verbatim font info (including size). We prepend rather than replace the styles because the Pygments output includes a required override of the default commandchars. Since the substitution is only important in the context of a PDF book, it only gets made if there’s a style in the ‘softcover.sty’ file. We also support custom overrides in ‘custom_pdf.sty’.
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# File 'lib/polytexnic/utils.rb', line 187 def add_font_info(string) softcover_sty = File.join('latex_styles', 'softcover.sty') custom_pdf_sty = File.join('latex_styles', 'custom_pdf.sty') regex = '{code}{Verbatim}{(.*)}' styles = nil [softcover_sty, custom_pdf_sty].reverse.each do |filename| if File.exist?(filename) styles ||= File.read(filename).scan(/#{regex}/).flatten.first end end unless styles.nil? string.gsub!("\\begin{Verbatim}[", "\\begin{Verbatim}[#{styles},") end string end |
#cache_hrefs(doc, latex = false) ⇒ Object
Caches URLs for href commands.
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# File 'lib/polytexnic/utils.rb', line 72 def cache_hrefs(doc, latex=false) doc.tap do |text| text.gsub!(/\\href{(.*?)}/) do key = digest($1) literal_cache[key] = $1 "\\href{#{key}}" end end end |
#debug? ⇒ Boolean
Returns true if we are debugging, false otherwise. Manually change to ‘true` on an as-needed basis.
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# File 'lib/polytexnic/utils.rb', line 223 def debug? false end |
#digest(string, options = {}) ⇒ Object
Returns a salted hash digest of the string.
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# File 'lib/polytexnic/utils.rb', line 45 def digest(string, = {}) salt = [:salt] || SecureRandom.base64 Digest::SHA1.hexdigest("#{salt}--#{string}") end |
#escape_backslashes(string) ⇒ Object
Escapes backslashes. Interpolated backslashes need extra escaping. We only escape ‘\’ by itself, i.e., a backslash followed by spaces or the end of line.
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# File 'lib/polytexnic/utils.rb', line 67 def escape_backslashes(string) string.gsub(/\\(\s+|$)/) { '\\\\' + $1.to_s } end |
#framed(code) ⇒ Object
Puts a frame around code.
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# File 'lib/polytexnic/utils.rb', line 164 def framed(code) "\\begin{framed_shaded}\n#{code}\n\\end{framed_shaded}" end |
#highlight(key, content, language, formatter, options) ⇒ Object
Highlights a code sample.
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# File 'lib/polytexnic/utils.rb', line 169 def highlight(key, content, language, formatter, ) require 'pygments' = JSON.parse('{' + .to_s + '}') if ['linenos'] && formatter == 'html' # Inline numbers look much better in HTML but are invalid in LaTeX. ['linenos'] = 'inline' end highlight_cache[key] ||= Pygments.highlight(content, lexer: language, formatter: formatter, options: ) end |
#highlight_lines(output, options) ⇒ Object
Highlight lines (i.e., with a yellow backgroun). This is needed due to a Pygments bug that fails to highlight lines in the LaTeX output.
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# File 'lib/polytexnic/utils.rb', line 152 def highlight_lines(output, ) highlighted_lines().each do |i| output[i] = '\colorbox{hilightyellow}{' + output[i] + '}' end end |
#highlight_source_code(document) ⇒ Object
Highlights source code.
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# File 'lib/polytexnic/utils.rb', line 124 def highlight_source_code(document) if document.is_a?(String) # LaTeX substitutions = {} document.tap do code_cache.each do |key, (content, language, in_codelisting, )| code = highlight(key, content, language, 'latex', ) output = code.split("\n") horrible_backslash_kludge(add_font_info(output.first)) highlight_lines(output, ) code = output.join("\n") substitutions[key] = in_codelisting ? code : framed(code) end document.gsub!(Regexp.union(substitutions.keys), substitutions) end else # HTML document.css('div.code').each do |code_block| key = code_block.content next unless (value = code_cache[key]) content, language, _, = value code_block.inner_html = highlight(key, content, language, 'html', ) end end end |
#highlighted_lines(options) ⇒ Object
Returns an array with the highlighted lines.
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# File 'lib/polytexnic/utils.rb', line 159 def highlighted_lines() JSON.parse('{' + .to_s + '}')['hl_lines'] || [] end |
#horrible_backslash_kludge(string) ⇒ Object
Does something horrible with backslashes. OK, so the deal is that code highlighted for LaTeX contains the line beginVerbatim Oh crap, there are backslashes in there. This means we have no chance of getting things to work after interpolating, gsubbing, and so on, because in Ruby ‘\foo’ is the same as ‘\\foo’, ‘}’ is ‘}’, etc. I thought I escaped (heh) this problem with the ‘escape_backslashes` method, but here the problem is extremely specific. In particular, \{} is really \ and { and }, but Ruby doensn’t know WTF to do with it, and thinks that it’s “\{}”, which is the same as ‘{}’. The solution is to replace ‘\\’ with some number of backslashes. How many? I literally had to just keep adding backslashes until the output was correct when running ‘softcover build:pdf`.
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# File 'lib/polytexnic/utils.rb', line 217 def horrible_backslash_kludge(string) string.gsub!(/commandchars=\\\\/, 'commandchars=\\\\\\\\') end |
#linux? ⇒ Boolean
Returns true if platform is Linux.
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# File 'lib/polytexnic/utils.rb', line 40 def linux? RUBY_PLATFORM.match(/linux/) end |
#os_x? ⇒ Boolean
Returns true if platform is OS X.
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# File 'lib/polytexnic/utils.rb', line 35 def os_x? RUBY_PLATFORM.match(/darwin/) end |
#os_x_newer? ⇒ Boolean
Returns true for OS X Mountain Lion (10.8) and later.
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# File 'lib/polytexnic/utils.rb', line 25 def os_x_newer? os_x? && !os_x_older? end |
#os_x_older? ⇒ Boolean
Returns true for OS X Lion (10.7) and earlier.
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# File 'lib/polytexnic/utils.rb', line 30 def os_x_older? os_x? && RUBY_PLATFORM.include?('11') end |
#pipeline_digest(element) ⇒ Object
Returns a digest for passing things through the pipeline.
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# File 'lib/polytexnic/utils.rb', line 51 def pipeline_digest(element) value = digest("#{Time.now.to_s}::#{element}") @literal_cache[element.to_s] ||= value end |
#profiling? ⇒ Boolean
Returns true if we are profiling the code, false otherwise. Manually change to ‘true` on an as-needed basis.
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# File 'lib/polytexnic/utils.rb', line 229 def profiling? return false if test? false end |
#set_test_mode! ⇒ Object
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# File 'lib/polytexnic/utils.rb', line 234 def set_test_mode! @@test_mode = true end |
#test? ⇒ Boolean
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# File 'lib/polytexnic/utils.rb', line 238 def test? defined?(@@test_mode) && @@test_mode end |
#tralics ⇒ Object
Returns the executable for the Tralics LaTeX-to-XML converter.
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# File 'lib/polytexnic/utils.rb', line 10 def tralics filename = if os_x_newer? 'tralics-os-x-newer' elsif os_x_older? 'tralics-os-x-older' elsif linux? 'tralics-linux' else raise "Platform #{RUBY_PLATFORM} not supported" end project_root = File.join(File.dirname(__FILE__), '..', '..') File.join(project_root, 'precompiled_binaries', filename) end |
#tralics_commands ⇒ Object
Returns some commands for Tralics. For various reasons, we don’t actually want to include these in the style file that gets passed to LaTeX. For example, the commands with ‘xmlelt’ aren’t even valid LaTeX; they’re actually pseudo-LaTeX that has special meaning to the Tralics processor.
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# File 'lib/polytexnic/utils.rb', line 97 def tralics_commands base_commands = <<-'EOS' % Commands specific to Tralics \def\hyperref[#1]#2{\xmlelt{a}{\XMLaddatt{target}{#1}#2}} \newcommand{\heading}[1]{\xmlelt{heading}{#1}} \newcommand{\codecaption}[1]{\xmlelt{heading}{#1}} \newcommand{\sout}[1]{\xmlelt{sout}{#1}} \newcommand{\kode}[1]{\xmlelt{kode}{#1}} \newcommand{\filepath}[1]{\xmlelt{filepath}{#1}} \newcommand{\image}[1]{\xmlelt{image}{#1}} \newcommand{\imagebox}[1]{\xmlelt{imagebox}{#1}} % Ignore pbox argument, just replacing with content. \newcommand{\pbox}[2]{#2} % Ignore some other commands. \newcommand{\includepdf}[1]{} \newcommand{\newunicodechar}[2]{fdsfdas} EOS custom_commands = <<-EOS \\usepackage{amsthm} \\theoremstyle{definition} \\newtheorem{codelisting}{#{language_labels["listing"]}}[chapter] \\newtheorem{aside}{#{language_labels["aside"]}}[chapter] EOS [base_commands, custom_commands].join("\n") end |
#underscore_digest ⇒ Object
Returns a digest for use in labels. I like to use labels of the form cha:foo_bar, but for some reason Tralics removes the underscore in this case.
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# File 'lib/polytexnic/utils.rb', line 59 def underscore_digest pipeline_digest('_') end |
#xmlelement(name, skip = false) ⇒ Object
Returns a Tralics pseudo-LaTeX XML element. The use of the ‘skip’ flag is a hack to be able to use xmlelement even when generating, e.g., LaTeX, where we simply want to yield the block.
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# File 'lib/polytexnic/utils.rb', line 86 def xmlelement(name, skip = false) output = (skip ? "" : "\\begin{xmlelement}{#{name}}") output << yield if block_given? output << (skip ? "" : "\\end{xmlelement}") end |