class GitHub::Markup::Implementation

def file_ext_regexp
  @file_ext_regexp ||= /\.(#{regexp})\z/
end

def initialize(regexp)
  @regexp = regexp
end

def load
  # no-op by default
end

def match?(filename)
  file_ext_regexp =~ filename
end

def render(content)
  raise NotImplementedError, "subclasses of GitHub::Markup::Implementation must define #render"
end