module Nokogiri

def self.HTML5(input, url = nil, encoding = nil, **options, &block)
  Nokogiri::HTML5::Document.parse(input, url, encoding, **options, &block)
end

def self.jruby? # :nodoc:
  VersionInfo.instance.jruby?
end

def self.uses_gumbo?
  uses_libxml? # TODO: replace with Gumbo functionality
end

def self.uses_libxml?(requirement = nil) # :nodoc:
  return false unless VersionInfo.instance.libxml2?
  return true unless requirement
  Gem::Requirement.new(requirement).satisfied_by?(VersionInfo.instance.loaded_libxml_version)
end

def HTML4(input, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_HTML, &block)
  Nokogiri::HTML4::Document.parse(input, url, encoding, options, &block)
end

def Slop(*args, &block)
  Nokogiri(*args, &block).slop!
end

def XML(thing, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_XML, &block)
  Nokogiri::XML::Document.parse(thing, url, encoding, options, &block)
end

def XSLT stylesheet, modules = {}
  XSLT.parse(stylesheet, modules)
end

def install_default_aliases
  # Make sure to support some popular encoding aliases not known by
  # all iconv implementations.
  {
    "Windows-31J" => "CP932",	# Windows-31J is the IANA registered name of CP932.
  }.each do |alias_name, name|
    EncodingHandler.alias(name, alias_name) if EncodingHandler[alias_name].nil?
  end
end

def make(input = nil, opts = {}, &blk)
  if input
    Nokogiri::HTML4.fragment(input).children.first
  else
    Nokogiri(&blk)
  end
end

def parse(string, url = nil, encoding = nil, options = nil)
  if string.respond_to?(:read) ||
      /^\s*<(?:!DOCTYPE\s+)?html[\s>]/i === string[0, 512]
    # Expect an HTML indicator to appear within the first 512
    # characters of a document. (<?xml ?> + <?xml-stylesheet ?>
    # shouldn't be that long)
    Nokogiri.HTML4(string, url, encoding,
      options || XML::ParseOptions::DEFAULT_HTML)
  else
    Nokogiri.XML(string, url, encoding,
      options || XML::ParseOptions::DEFAULT_XML)
  end.tap do |doc|
    yield doc if block_given?
  end
end