Class: Mdtoc::Markdown::FragmentGenerator::GitHub

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
Includes:
Mdtoc::Markdown::FragmentGenerator
Defined in:
lib/mdtoc/markdown/fragment_generator.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ GitHub

Returns a new instance of GitHub.



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# File 'lib/mdtoc/markdown/fragment_generator.rb', line 22

def initialize
  @counts = T.let(Hash.new(0), T::Hash[String, Integer])
end

Instance Method Details

#generate(label) ⇒ Object 



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# File 'lib/mdtoc/markdown/fragment_generator.rb', line 27

def generate(label)
  # GitHub's fragment generation:
  # 1. Downcase
  # 2. Replace spaces with dashes
  # 3. Remove non-alphanumeric characters (keeping dashes, dots and underscores)
  # 4. Collapse multiple dashes
  # 5. Remove leading/trailing dashes and dots (common in many implementations)
  fragment = label.downcase.tr(' ', '-').gsub(/[^\w.-]/, '')
  fragment = fragment.gsub(/-+/, '-')
  fragment = fragment.gsub(/^[.-]+|[.-]+$/, '')

  count = @counts[fragment]
  @counts[fragment] += 1

  if count.positive?
    "#{fragment}-#{count}"
  else
    fragment
  end
end