Class: AsciidoctorPDFExtensions

Inherits:
Object
  • Object
show all
Defined in:
lib/asciidoctor-pdf-mathjax.rb

Class Attribute Summary collapse

Instance Method Summary collapse

Class Attribute Details

.tempfiles ⇒ Object (readonly)

Returns the value of attribute tempfiles.



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# File 'lib/asciidoctor-pdf-mathjax.rb', line 22

def tempfiles
  @tempfiles
end

Instance Method Details

#convert_inline_quoted(node) ⇒ Object 



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# File 'lib/asciidoctor-pdf-mathjax.rb', line 78

def convert_inline_quoted(node)
  latex_content = extract_latex_content(node.text, node.type)
  return super if latex_content.nil?

  theme = (load_theme node.document)
  math_font = node.document.attributes['math-font'] || MATHJAX_DEFAULT_FONT_FAMILY

  svg_output, error = stem_to_svg(latex_content, true, math_font)
  if svg_output.nil? || svg_output.empty?
    logger.warn "Error processing stem: #{error || 'No SVG output'}"
    return super
  end
  adjusted_svg, svg_width = adjust_svg_to_match_text(svg_output, node, theme)
  tmp_svg = Tempfile.new(%w[stem- .svg])
  self.class.tempfiles << tmp_svg
  begin
    tmp_svg.write(adjusted_svg)
    tmp_svg.close

    logger.debug "Successfully embedded stem inline #{node.text} with font #{math_font} as SVG image"
    quoted_text = "<img src=\"#{tmp_svg.path}\" format=\"svg\" width=\"#{svg_width}\" alt=\"#{node.text}\">"
    node.id ? %(<a id="#{node.id}">#{DummyText}</a>#{quoted_text}) : quoted_text
  rescue => e
    logger.warn "Failed to process SVG: #{e.message}"
    super
  end
end

#convert_stem(node) ⇒ Object 



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# File 'lib/asciidoctor-pdf-mathjax.rb', line 25

def convert_stem(node)
  arrange_block node do |_|
    add_dest_for_block node if node.id

    latex_content = extract_latex_content(node.content, node.style.to_sym)
    math_font = node.document.attributes['math-font'] || MATHJAX_DEFAULT_FONT_FAMILY

    svg_output, error = stem_to_svg(latex_content, false, math_font)

    # noinspection RubyResolve
    code_padding = @theme.code_padding
    if svg_output.nil? || svg_output.empty?
      logger.warn "Failed to convert STEM to SVG: #{error} (Fallback to code block)"
      pad_box code_padding, node do
        theme_font :code do
          typeset_formatted_text [{ text: (guard_indentation latex_content), color: @font_color }],
                                 (calc_line_metrics @base_line_height),
                                 bottom_gutter: @bottom_gutters[-1][node]
        end
      end
    else
      svg_output = adjust_svg_color(svg_output, @font_color)
      svg_default_font_size = FALLBACK_FONT_SIZE

      svg_doc = REXML::Document.new(svg_output)
      svg_width = svg_doc.root.attributes['width'].to_f * POINTS_PER_EX || raise("No width found in SVG")

      scaling_factor = @font_size.to_f / svg_default_font_size
      svg_width = svg_width * scaling_factor

      svg_file = Tempfile.new(%w[stem .svg])
      begin
        svg_file.write(svg_output)
        svg_file.close

        pad_box code_padding, node do
          begin
            image_obj = image svg_file.path, position: :center, width: svg_width, height: nil
            logger.debug "Successfully embedded stem block (as latex) #{latex_content} as SVG image" if image_obj
          rescue Prawn::Errors::UnsupportedImageType => e
            logger.warn "Unsupported image type error: #{e.message}"
          rescue StandardError => e
            logger.warn "Failed embedding SVG: #{e.message}"
          end
        end
      ensure
        svg_file.unlink
      end
    end
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end