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module WikiCloth
class MathExtension < Extension
# <math>latex markup</math>
#
element 'math', :skip_html => true, :run_globals => false do |buffer|
blahtex_path = @options[:blahtex_path] || '/usr/bin/blahtex'
blahtex_png_path = @options[:blahtex_png_path] || '/tmp'
blahtex_options = @options[:blahtex_options] || '--texvc-compatible-commands --mathml-version-1-fonts --disallow-plane-1 --spacing strict'
if File.exists?(blahtex_path) && @options[:math_formatter] != :google
begin
# pass tex markup to blahtex
response = IO.popen("#{blahtex_path} #{blahtex_options} --png --mathml --png-directory #{blahtex_png_path}","w+") do |pipe|
pipe.write(buffer.element_content)
pipe.close_write
pipe.gets
end
xml_response = REXML::Document.new(response).root
if @options[:blahtex_html_prefix]
# render as embedded image
file_md5 = xml_response.elements["png/md5"].text
"<img src=\"#{File.join(@options[:blahtex_html_prefix],"#{file_md5}.png")}\" />"
else
# render as mathml
html = xml_response.elements["mathml/markup"].text
"<math xmlns=\"http://www.w3.org/1998/Math/MathML\">#{xml_response.elements["mathml/markup"].children.to_s}</math>"
end
rescue => err
# blahtex error
"<span class=\"error\">#{I18n.t("unable to parse mathml", :error => err)}</span>"
end
else
# if blahtex does not exist fallback to google charts api
encoded_string = URI.escape(buffer.element_content, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]"))
"<img src=\"https://chart.googleapis.com/chart?cht=tx&chl=#{encoded_string}\" />"
end
end
end
end
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