class BookLab::SML::Rules::Heading

Public Class Methods

match?(node) click to toggle source
# File lib/booklab/sml/rules/heading.rb, line 7
def self.match?(node)
  %w[h1 h2 h3 h4 h5 h6].include?(tag_name(node))
end
to_html(node, opts = {}) click to toggle source
# File lib/booklab/sml/rules/heading.rb, line 11
def self.to_html(node, opts = {})
  renderer = opts[:renderer]
  title = renderer.children_to_html(node) || ""
  heading_tag = tag_name(node)

  title_length = title.length
  min_length = title_length * 0.3
  words_length = /[a-z0-9]/i.match(title)&.length || 0
  header_id = title.gsub(/[^a-z0-9]+/i, "-").downcase.gsub(/^\-|\-$/, "")
  if title_length - header_id.length > min_length
    header_id = Digest::MD5.hexdigest(title.strip)[0..8]
  end

  %(<#{heading_tag} id="#{header_id}"><a href="##{header_id}" class="heading-anchor">#</a>#{title}</#{heading_tag}>)
end