Class: Jekyll::MscgenTag

Inherits:
Liquid::Tag
  • Object
show all
Defined in:
lib/jekyll-mscgen.rb

Overview

defaults which get stripped out

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, text, tokens) ⇒ MscgenTag

Returns a new instance of MscgenTag.



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# File 'lib/jekyll-mscgen.rb', line 9

def initialize(tag_name, text, tokens)
  super
end

Instance Method Details

#purify(output) ⇒ Object

remove basic styling from output



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# File 'lib/jekyll-mscgen.rb', line 14

def purify(output)
  [
    'stroke="black"', 'font-family="Helvetica"', 'font-size="12"',
    /textLength="\d+"/
  ].each do |pattern|
    output.gsub! pattern, ''
  end

  output
end

#render(context) ⇒ Object 



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# File 'lib/jekyll-mscgen.rb', line 25

def render(context)
  @text = @nodelist.join('')
  @text = "msc {\n #{@text} \n}"

  Open3.popen3('mscgen -i- -o- -T svg') do |stdin,out,err|
    begin
      stdin.puts(@text)
      stdin.close
    rescue Error
      puts 'error generating mscgen chart'

    ensure
      errors = err.read.strip
      output = out.read.strip
      if errors != "" and errors != nil
        puts "mscgen error: #{errors}"
        errors = "<div style='color: red; background: \#ffeeee;'>#{CGI.escapeHTML(errors)}</div>"
        if output != nil
          output = CGI.escapeHTML(output)
        end
      end

      output = output.lines.drop(2).join('')
      output = purify(output)

      return "<div class='mscgen-chart'>#{errors}#{output}</div>"
    end
  end
end