lib/cgi/util.rb


# frozen_string_literal: true
class CGI
  module Util; end
  include Util
  extend Util
end

module CGI::Util
  # Format a +Time+ object as a String using the format specified by RFC 1123.
  #
  #   CGI.rfc1123_date(Time.now)
  #     # Sat, 01 Jan 2000 00:00:00 GMT
  def rfc1123_date(time)
    time.getgm.strftime("%a, %d %b %Y %T GMT")
  end

  # Prettify (indent) an HTML string.
  #
  # +string+ is the HTML string to indent.  +shift+ is the indentation
  # unit to use; it defaults to two spaces.
  #
  #   print CGI.pretty("<HTML><BODY></BODY></HTML>")
  #     # <HTML>
  #     #   <BODY>
  #     #   </BODY>
  #     # </HTML>
  #
  #   print CGI.pretty("<HTML><BODY></BODY></HTML>", "\t")
  #     # <HTML>
  #     #         <BODY>
  #     #         </BODY>
  #     # </HTML>
  #
  def pretty(string, shift = "  ")
    lines = string.gsub(/(?!\A)<.*?>/m, "\n\\0").gsub(/<.*?>(?!\n)/m, "\\0\n")
    end_pos = 0
    while end_pos = lines.index(/^<\/(\w+)/, end_pos)
      element = $1.dup
      start_pos = lines.rindex(/^\s*<#{element}/i, end_pos)
      lines[start_pos ... end_pos] = "__" + lines[start_pos ... end_pos].gsub(/\n(?!\z)/, "\n" + shift) + "__"
    end
    lines.gsub(/^((?:#{Regexp::quote(shift)})*)__(?=<\/?\w)/, '\1')
  end
end

# For backward compatibility
require 'cgi/escape' unless defined?(CGI::EscapeExt)