Class: HTML::Pipeline::SVGTeX::PostFilter

Inherits:
Filter
  • Object
show all
Defined in:
lib/html/pipeline/svgtex.rb

Instance Attribute Summary

Attributes inherited from Filter

#context, #result

Instance Method Summary collapse

Methods inherited from Filter

#base_url, call, #current_user, #doc, #has_ancestor?, #html, #initialize, #needs, #parse_html, #repository, to_document, to_html, #validate

Constructor Details

This class inherits a constructor from HTML::Pipeline::Filter

Instance Method Details

#call ⇒ Object 



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# File 'lib/html/pipeline/svgtex.rb', line 76

def call
  doc.search('code.mathjax').each do |node|
    eqn = node.inner_text
    rsp = session.post(context[:svgtex_url], :q => eqn)
    if rsp.status == 200
      node.parent.replace rsp.body.gsub(/margin-(left|right): 0px; /, "")
    else
      node.remove_attribute 'class'
    end
  end
  doc.search('code:not([class])').each do |node|
    eqn = node.inner_text
    next unless eqn.sub!(/\A\{mathjax\} /, '')
    rsp = session.post(context[:svgtex_url], :q => eqn)
    if rsp.status == 200
      node.replace "<img style='display: inline; max-height: 1em;' class='mathjax' src='data:image/svg+xml;base64,#{Base64.encode64 rsp.body}' alt='#{CGI.escape_html eqn}' />"
    else
      node.inner_text = eqn
    end
  end
  doc
end

#session ⇒ Object 



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# File 'lib/html/pipeline/svgtex.rb', line 99

def session
  @session ||= Patron::Session.new
end