Class: Mathematical::Render

Inherits:
Object
  • Object
show all
Defined in:
lib/mathematical/render.rb

Constant Summary collapse

DEFAULT_OPTS = 
{
  :ppi => 72.0,
  :zoom => 1.0,
  :base64 => false
}

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Render

Returns a new instance of Render.

Raises:

  • (TypeError) 


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# File 'lib/mathematical/render.rb', line 13

def initialize(opts = {})
  raise(TypeError, "opts must be a hash!") unless opts.is_a? Hash

  @config = DEFAULT_OPTS.merge(opts)
  begin
    @processer = Mathematical::Process.new(@config)
  rescue TypeError => e # some error in the C code
    raise
  end
end

Instance Method Details

#render(maths) ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/mathematical/render.rb', line 24

def render(maths)
  raise(TypeError, "text must be a string!") unless maths.is_a? String
  raise(ArgumentError, "text must be in itex format (`$...$` or `$$...$$`)!") unless maths =~ /\A\${1,2}/

  # TODO: figure out how to write SVGs without the tempfile
  tempfile = Tempfile.new('mathematical-temp.svg')
  begin
    raise RuntimeError unless @processer.process(maths, tempfile.path)
    svg_content = File.open(tempfile.path, 'r') { |image_file| image_file.read }
    svg_content = svg_content[xml_header.length..-1] # remove starting <?xml...> tag
    @config[:base64] ? svg_to_base64(svg_content) : svg_content
  rescue RuntimeError => e # an error in the C code, probably a bad TeX parse
    $stderr.puts "#{e.message}: #{maths}"
    maths
  end
end