# frozen_string_literal: true
$LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__))) unless $LOAD_PATH.include?(File.expand_path(File.dirname(__FILE__)))

require "nokogiri"

require_relative "loofah/version"
require_relative "loofah/metahelpers"
require_relative "loofah/elements"

require_relative "loofah/html5/safelist"
require_relative "loofah/html5/libxml2_workarounds"
require_relative "loofah/html5/scrub"

require_relative "loofah/scrubber"
require_relative "loofah/scrubbers"

require_relative "loofah/instance_methods"
require_relative "loofah/xml/document"
require_relative "loofah/xml/document_fragment"
require_relative "loofah/html/document"
require_relative "loofah/html/document_fragment"

# == Strings and IO Objects as Input
#
# Loofah.document and Loofah.fragment accept any IO object in addition
# to accepting a string. That IO object could be a file, or a socket,
# or a StringIO, or anything that responds to +read+ and
# +close+. Which makes it particularly easy to sanitize mass
# quantities of docs.
#
module Loofah
  class << self
    # Shortcut for Loofah::HTML::Document.parse
    # This method accepts the same parameters as Nokogiri::HTML::Document.parse
    def document(*args, &block)
      remove_comments_before_html_element Loofah::HTML::Document.parse(*args, &block)
    end

    # Shortcut for Loofah::HTML::DocumentFragment.parse
    # This method accepts the same parameters as Nokogiri::HTML::DocumentFragment.parse
    def fragment(*args, &block)
      Loofah::HTML::DocumentFragment.parse(*args, &block)
    end

    # Shortcut for Loofah.fragment(string_or_io).scrub!(method)
    def scrub_fragment(string_or_io, method)
      Loofah.fragment(string_or_io).scrub!(method)
    end

    # Shortcut for Loofah.document(string_or_io).scrub!(method)
    def scrub_document(string_or_io, method)
      Loofah.document(string_or_io).scrub!(method)
    end

    # Shortcut for Loofah::XML::Document.parse
    # This method accepts the same parameters as Nokogiri::XML::Document.parse
    def xml_document(*args, &block)
      Loofah::XML::Document.parse(*args, &block)
    end

    # Shortcut for Loofah::XML::DocumentFragment.parse
    # This method accepts the same parameters as Nokogiri::XML::DocumentFragment.parse
    def xml_fragment(*args, &block)
      Loofah::XML::DocumentFragment.parse(*args, &block)
    end

    # Shortcut for Loofah.xml_fragment(string_or_io).scrub!(method)
    def scrub_xml_fragment(string_or_io, method)
      Loofah.xml_fragment(string_or_io).scrub!(method)
    end

    # Shortcut for Loofah.xml_document(string_or_io).scrub!(method)
    def scrub_xml_document(string_or_io, method)
      Loofah.xml_document(string_or_io).scrub!(method)
    end

    # A helper to remove extraneous whitespace from text-ified HTML
    def remove_extraneous_whitespace(string)
      string.gsub(/\n\s*\n\s*\n/, "\n\n")
    end

    private

    # remove comments that exist outside of the HTML element.
    #
    # these comments are allowed by the HTML spec:
    #
    #    https://www.w3.org/TR/html401/struct/global.html#h-7.1
    #
    # but are not scrubbed by Loofah because these nodes don't meet
    # the contract that scrubbers expect of a node (e.g., it can be
    # replaced, sibling and children nodes can be created).
    def remove_comments_before_html_element(doc)
      doc.children.each do |child|
        child.unlink if child.comment?
      end
      doc
    end
  end
end