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# File 'lib/nexmo_markdown_renderer/filters/heading_filter.rb', line 4
def call(input)
@input = input
@headings = []
heading_tag_list = %w[h1 h2 h3 h4 h5 h6]
headings = document.children.select do |child|
heading_tag_list.include? child.name
end
headings.each do |heading|
parameterized_heading = parameterized_heading_without_collision(heading)
heading['id'] = parameterized_heading
heading['data-id'] = SecureRandom.hex
heading['class'] = heading[:class]
heading['class'] += ' Vlt-title--icon'
heading.prepend_child " <a href=\"#\#{parameterized_heading}\" class=\"heading-permalink\">\n <svg class=\"Vlt-grey\"><use xlink:href=\\\"/symbol/volta-icons.svg#Vlt-icon-link\\\" /></svg>\n </a>\n HEREDOC\n end\n \n @document.to_html\nend\n"
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