parse_url

# File lib/rdoc/markup/formatter.rb, line 229
  def parse_url url
    case url
    when /^rdoc-label:([^:]*)(?::(.*))?/ then
      scheme = 'link'
      path   = "##{$1}"
      id     = " id=\"#{$2}\"" if $2
    when /([A-Za-z]+):(.*)/ then
      scheme = $1.downcase
      path   = $2
    when /^#/ then
    else
      scheme = 'http'
      path   = url
      url    = url
    end

    if scheme == 'link' then
      url = if path[0, 1] == '#' then # is this meaningful?
              path
            else
              self.class.gen_relative_url @from_path, path
            end
    end

    [scheme, url, id]
  end