package URI::ParseSearchString;

require Exporter;
@ISA = (Exporter);
@EXPORT = ( qw (parse_search_string findEngine se_host se_name se_term) );

use warnings;
use strict;

use URI::Split  ( "uri_split"    ) ;
use URI::Escape ( "uri_unescape" ) ;

=head1 NAME

URI::ParseSearchString - parse Apache refferer logs and extract search engine query strings.

=head1 VERSION

Version 2.5  (nearly at YAPC2008 version)

=cut

our $VERSION = '2.5';

=head1 SYNOPSIS

  use URI::ParseSearchString ;

  my $uparse = new URI::ParseSearchString() ;
  
  my $query_terms = 
      $uparse->se_term('http://www.google.com/search?hl=en&q=a+simple+test&btnG=Google+Search') ;
  my $engine_name = 
     $uparse->se_name('http://www.google.com/search?hl=en&q=a+simple+test&btnG=Google+Search') ;
  my $engine_hostname = 
     $uparse->se_host('http://www.google.com/search?hl=en&q=a+simple+test&btnG=Google+Search') ;

=head1 FUNCTIONS

=head2 new
  
  Creates a new instance object of the module.
  
  my $uparse = new URI::ParseSearchString() ;

=cut

sub new {
  my $class = shift ;
  my $self = { } ;
  my @engines = (<DATA>) ;
  
  $self->{engines} = \@engines ;
  
  return bless $self, $class ;
}

=head2 parse_search_string

This module provides a simple function to parse and extract search engine query strings. It was designed and tested having
Apache referrer logs in mind. It can be used for a wide number of purposes, including tracking down what keywords people use
on popular search engines before they land on a site. It makes use of URI::split to extract the string and URI::Escape to un-escape
the encoded characters in it.	Although a number of existing modules and scripts exist for this purpose,
the majority of them are either outdated using obsolete search strings associated with each engine.

The default function exported is "parse_search_string" which accepts an unquoted referrer string as input and returns the 
search engine query contained within. It currently works with both escaped and un-escaped queries and will translate the search
terms before returning them in the latter case. The function returns undef in all other cases and errors.

for example: 

   $string = 
      $uparse->parse_search_string('http://www.google.com/search?hl=en&q=a+simple+test&btnG=Google+Search');

would return I<'a simple test'>

whereas

   $string = 
      $uparse->parse_search_string('http://www.mamma.com/Mamma?utfout=1&qtype=0&query=a+more%21+complex_+search%24&Submit=%C2%A0%C2%A0Search%C2%A0%C2%A0');

would return I<'a more! complex_ search$'> 

Currently supported search engines include:

=over

=item *
B<Abacho>

=item *
B<AOL (UK)>

=item *
B<AOLSEARCH>

=item *
B<AllTheWeb>

=item *
B<ASK.com>

=item *
B<Blueyonder (UK)>

=item *
B<BBC search>

=item *
B<Categorico (IT)>

=item *
B<Conduit>

=item *
B<Cuil>

=item *
B<Feedster Blog Search>

=item * 
B<Fireball (DE)>

=item *
B<Froogle>

=item *
B<Froogle (UK)>

=item *
B<Google & 231 other TLD's>

=item *
B<Google Blog Search>

=item *
B<Godado>

=item *
B<Godado (IT)>

=item *
B<HotBot>

=item * 
B<Ice Rocket Blog Search>

=item *
B<ICQ.com>

=item *
B<ilMotore.com>

=item *
B<Ithaki.net>

=item *
B<Kataweb (IT)>

=item *
B<Lycos>

=item * 
B<Lycos (ES)>

=item *
B<Lycos (IT)>

=item *
B<Libero (IT)>

=item *
B<Mamma>

=item *
B<Megasearching.net>

=item *
B<Mirago (UK)>

=item *
B<MyWebSearch.com>

=item *
B<MSN>

=item *
B<Microsoft live.com>

=item *
B<MyWay>

=item *
B<Netscape>

=item *
B<NTLworld>

=item *
B<Orange>

=item *
B<Ozu ES>

=item *
B<Starware>

=item *
B<Sweetim>

=item *
B<Simpatico (IT)>

=item *
B<Soso>

=item *
B<Technorati Blog Search>

=item * 
B<Tesco Google search>

=item *
B<Terra (ES)>

=item *
B<Tiscali (UK)>

=item *
B<TheSpider (IT)>

=item *
B<VirginMedia>

=item *
B<Web.de (DE)>

=item *
B<Yahoo>

=item *
B<Yahoo Japan>

=back

=cut

=head2 se_term

Same as parse_search_string().

=cut

sub se_term {
  my $self = shift ;
  my $string = shift ;
  
  return unless defined $string ;
  return $self->parse_search_string($string) ;
    
}

sub parse_search_string {
  my $self = shift ;
  
	my $string = shift ;
	return unless defined $string ; 

	my $query_string ;

	my ($scheme, $auth, $path, $query, $frag) = URI::Split::uri_split($string);
	undef $scheme; undef  $frag ;
	
	return unless defined $auth ;

	# parse technorati and feedster search strings.
	if ($auth =~ m/(technorati|feedster)\.com/i ) {
		$path =~ s/\/search\///g ;
		my $query_string = $path ;
		$query_string = uri_unescape($query_string);
		undef $path ;
		$query_string =~ s/\+/ /g ;
		return $query_string ;
	}
	
	return unless defined $query ;
	undef $path ;
	
	# parse Google , Ozu.es
	if ( ($auth =~ m/^www.google\./i) ) {
	  	$query =~ m/\&q=([^&]+)/i || $query =~ m/q=([^&]+)/i ; ;
	  	  return unless defined $1 ;
  	    $query_string = $1 ;
  	    $query_string =~ s/\+/ /g ;
  	    $query_string = uri_unescape($query_string);
  	    return $query_string ;
  }
  	
	# parse MSN, Altavista, Blueyonder, AllTheWeb, Tesco and Ice Rocket search strings.
	if ($auth =~ m/(.altavista.|sweetim.com|alltheweb.com|^search.msn.co|.ask.com|search.bbc.co.uk|search.live.com|search.virginmedia.com|search.prodigy.msn.com)/i 
	|| $auth =~ m/(cuil.com|categorico.it|search.abacho.com|www.excite.|kataweb.it|thespider.it|search.icq.com|blueyonder.co.uk|search.conduit.com|blogs.icerocket.com|blogsearch.google.com|froogle.google.co|tesco.net|gps.virgin.net|search.ntlworld.com|search.orange.co.uk|search.arabia.msn.com)/i ) {
		$query =~ m/q=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}

   # ozu.es
	if ($auth =~ m/(.ozu.es)/i ) {
		 $query =~ m/\&q=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
		
	# parse Lycos, HotBot and Fireball.de search strings.
	elsif ($auth =~ m/(simpatico.ws|libero.it|ithaki.net|ilmotore.com|lycos.es|terra.es|search.lycos.|hotbot.co|suche.fireball.de|aolsearch.aol.com|lycos.it)/i ) {
		$query =~ m/query=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}

   # parse mywebsearch.com 
	elsif ($auth =~ m/(godado.(it|com))/i ) {
		$query =~ m/key=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}	
	
	# parse mywebsearch.com 
	elsif ($auth =~ m/(search.mywebsearch.com)/i ) {
		$query =~ m/searchfor=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
	
	# parse Yahoo search strings.
	elsif ($auth =~ m/search.yahoo/i) {
		$query =~ m/p=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
	
	# parse Soso.com
	
	elsif ($auth =~ m/soso.com/i) {
		$query =~ m/w=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
	
	# parse megasearching.net
	elsif ($auth =~ m/megasearching.net/i) {
		$query =~ m/s=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
	
	# parse Mirago search strings.
	elsif ($auth =~ m/www.mirago.co.uk/i) {
		$query =~ m/qry=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
		
	# parse Alice.it

   elsif ($auth =~ m/alice.it/i) {
		$query =~ m/qs=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}		
		
	# parse Netscape search strings.
	elsif ($auth =~ m/www.netscape.com/i ) {
		$query =~ m/s=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
	
	# parse Web.de search string.
	elsif ($auth =~ m/suche.web.de/i ) {
		$query =~ m/su=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}

	# parse Orange.es search string.
	elsif ($auth =~ m/orange.es/i ) {
		$query =~ m/buscar=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}

   # parse Orange.es search string.
	elsif ($auth =~ m/.myway.com/i ) {
		$query =~ m/searchfor=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}
		
	# parse Mamma, AOL UK, Tiscali  search strings.
	elsif ($auth =~ m/(mamma.com|search.aol.co.uk|tiscali.co.uk)/i ) {
		$query =~ m/query=([^&]+)/i ;
	    $query_string = $1 ;
	    $query_string =~ s/\+/ /g ;
	    $query_string = uri_unescape($query_string);
	    return $query_string ;
	}		
	
  # parse starware search strings
  elsif ( $auth =~ m/as.starware.com/i ) {
    $query =~ m/qry=([^&]+)/i ;
     $query_string = $1 ;
	   $query_string =~ s/\+/ /g ;
	   $query_string = uri_unescape($query_string);
	   return $query_string ;
  }
  return ;
}

=head2 findEngine

 Returns the search engine hostname and name extracted by the supplied referrer URL.
  
  my $engine = 
     $uparse->findEngine('http://www.google.com/search?hl=en&q=a+simple+test&btnG=Google+Search') ;
 
This will return "google.com" as the search engine hostname and 'Google' as the name.
Currently supports 231 Google TLD's & all the above mentioned search engines.

=cut

sub findEngine {
  my $self = shift ;
  my $ref_str = shift ;
  return unless defined $ref_str ;
  
  my $ra_engines = $self->{engines} ;
  return unless defined $ra_engines && ref $ra_engines eq 'ARRAY' ;
        
  foreach my $engine_id (@$ra_engines) {
    chomp ($engine_id) ;
    next if $engine_id =~ m@^#@ ;
    my ($host, $name) = split /\| /, $engine_id ;
    
    $host =~ s/\s{1,}//g ;
    $name =~ s/\s{1,}$//g ;
          
    if ($ref_str =~ m/$host/i ) {
       $host =~ s@www.@@ ;
       return ($host, $name) ;
    }    
  }
  return ;
}

=head2 se_host 

Wrapper around findEngine. Returns the search engine hostname.

=cut

sub se_host {
  my $self = shift ;
  my $string = shift ;
  return unless defined $string ;
  my ($host,$name) = $self->findEngine($string) ;
  return $host ;
}

=head2 se_name

Wrapper around findEngine. Returns the search engine canonical name.

=cut

sub se_name {
  my $self = shift ;
  my $string = shift ;
  return unless defined $string ;
  my ($host,$name) = $self->findEngine($string) ;
  return $name ;
}

=head1 AUTHOR

Spiros Denaxas, C<< <s.denaxas at gmail.com> >>

=head1 BUGS

This is my first CPAN module so I encourage you to send all comments, especially bad, 
to my email address.

This could not have been possible without the support of my co-workers at 
http://nestoria.co.uk - the easiest way of finding UK property.

=head1 SUPPORT

For more information, you could also visit my blog: 

	http://idaru.blogspot.com

=over 4

=back

=head1 COPYRIGHT & LICENSE

Copyright 2008 Spiros Denaxas, all rights reserved.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut

1; # End of URI::ParseSearchString

__DATA__
## -- Google TLD's
blogsearch.google.com | Google Blogsearch
www.google.ad | Google Andorra
www.google.ae | Google United Arab Emirates
www.google.af | Google Afghanistan
www.google.com.af | Google Afghanistan
www.google.ag | Google Antiqua and Barbuda
www.google.com.ag | Google Antiqua and Barbuda
www.google.off.ai | Google Anguilla
www.google.com.ai | Google Anguilla
www.google.am | Google Armenia
www.google.com.ar | Google Argentina
www.google.as | Google American Samoa
www.google.at | Google Austria
www.google.co.at  | Google Austria
www.google.com.au | Google Australia
www.google.az | Google Azerbaijan
www.google.com.az | Google Azerbaijan 
www.google.ba | Google Bosnia and Herzegovina
www.google.com.bd | Google Bangladesh
www.google.be | Google Belgium
www.google.bg | Google Bulgaria
www.google.com.bh | Google Bahrain
www.google.bi | Google Burundi
www.google.com.bi | Google Burundi
www.google.co.bi | Google Burundi
www.google.biz | Google dot biz
www.google.com.bn | Google Brunei Darussalam
www.google.bo | Google Bolivia
www.google.com.bo | Google Bolivia 
www.google.com.br | Google Brazil
www.google.bs | Google Bahamas
www.google.com.bs | Google Bahamas
www.google.co.bw | Google Botswana
www.google.bz | Google Belize
www.google.com.bz | Google Belize
www.google.ca | Google Canada
www.google.cc | Google Cocos Islands
www.google.cd | Google Dem Rep of Congo
www.google.cg | Google Rep of Congo
www.google.ch | Google Switzerland
www.google.ci | Google Cote dIvoire
www.google.co.ci | Google Ivory Coast
www.google.co.ck | Google Cook Islands
www.google.cl | Google Chile
www.google.cn | Google China
www.google.com.cn | Google China
www.google.com.co | Google 
www.google.co.cr | Google Costa Rica
www.google.com.cu | Google Cuba
www.google.cz | Google Czech Rep
www.google.de | Google Germany
www.google.dj | Google Djubouti
www.google.dk  | Google Denmark
www.google.dm  | Google Dominica
www.google.com.do | Google Dominican Rep
www.google.ec | Google Ecuador
www.google.com.ec | Google Ecuador
www.google.ee | Google Estonia
www.google.com.eg | Google Egypt
www.google.es | Google Spain
www.google.com.et | Google Ethiopia
www.google.fi | Google Finland
www.google.com.fj | Google Fiji
www.google.fm | Google Micronesia
www.google.fr | Google France
www.google.gd | Google Grenada
www.google.ge | Google Georgia
www.google.com.ge | Google Georgia
www.google.gf | Google French Guiana
www.google.gg | Google Guernsey
www.google.co.gg | Google Guernsey
www.google.com.gh | Google Ghana
www.google.com.gi | Google Gibraltar
www.google.gl | Google Greenland
www.google.com.gl | Google Greenland
www.google.co.gl | Google Greenland
www.google.gm | Google Gambia
www.google.gp | Google Guadeloupe
www.google.com.gp | Google Guadeloupe
www.google.gr | Google Greece
www.google.com.gr | Google Greece
www.google.com.gt | Google Guatemala
www.google.gy | Google Guyana
www.google.com.gy | Google Guyana
www.google.co.gy | Google Guyana
www.google.hk | Google Hong Kong
www.google.com.hk | Google Hong Kong
www.google.hn | Google Honduras
www.google.com.hn | Google Honduras
www.google.hr | Google Croatia
www.google.com.hr | Google Croatia
www.google.ht | Google Haiti
www.google.hu | Google Hungary
www.google.co.hu | Google Hungary 
www.google.co.id | Google Indonesia
www.google.ie | Google Ireland
www.google.co.il | Google Israel
www.google.im | Google Isle of Man
www.google.co.im | Google Isle of Man
www.google.in | Google India
www.google.co.in | Google India
www.google.info | Google dot info
www.google.is | Google Iceland
www.google.it | Google Italy
www.google.co.it | Google Italy
www.google.je | Google Jersey
www.google.co.je | Google Jersey
www.google.com.jm | Google Jamaica
www.google.jo | Google Jordan
www.google.com.jo | Google Jordan
www.google.jobs | Google dot jobs
www.google.jp | Google Japan
www.google.co.jp | Google Japan
www.google.co.ke | Google Kenya
www.google.kg | Google Kyrgyzstan
www.google.com.kg | Google Kyrgyzstan
www.google.com.kh | Google Cambodia
www.google.ki | Google Kiribati
www.google.com.ki | Google Kiribati
www.google.co.kr | Google South Korea
www.google.kz | Google Kazakhstan
www.google.com.kz | Google Kazakhstan
www.google.la | Google Laos
www.google.li | Google Liechtenstein
www.google.lk | Google Sri Lanka
www.google.com.lk | Google Sri Lanka
www.google.co.ls | Google Lesotho
www.google.lt | Google Lithuania
www.google.lu | Google Luxembourg
www.google.lv | Google Latvia
www.google.com.lv | Google Latvia
www.google.com.ly | Google Libya
www.google.ma | Google Morocco
www.google.co.ma | Google Morocco
www.google.md | Google Moldova
www.google.mn | Google Mongolia
www.google.mobi | Google dot mobi
www.google.ms | Google Montserrat
www.google.com.mt | Google Malta
www.google.mu | Google Mauritius
www.google.com.mu | Google Mauritius
www.google.co.mu | Google Mauritius
www.google.mv | Google Maldives
www.google.mw | Google Malawi
www.google.com.mw | Google Malawi
www.google.co.mw | Google Malawi
www.google.com.mx | Google Mexico
www.google.com.my | Google Malaysia
www.google.com.na | Google Namibia
www.google.net | Google dot net
www.google.nf | Google Norfolk Island
www.google.com.nf | Google Norfolk Island
www.google.com.ng | Google Nigeria
www.google.com.ni | Google Nicaragua
www.google.nl | Google Netherlands
www.google.no | Google Norway
www.google.com.np | Google Nepal
www.google.nr | Google Nauru
www.google.com.nr | Google Nauru
www.google.nu | Google Niue
www.google.co.nz | Google New Zeland
www.google.com.om | Google Oman
www.google.com.pa | Google Panama
www.google.com.pe | Google Peru
www.google.ph | Google Philipines
www.google.com.ph | Google Philipines
www.google.pk | Google Pakistan
www.google.com.pk | Google Pakistan
www.google.pl | Google Poland
www.google.com.pl | Google Poland
www.google.pn | Google Pitcairn Islands
www.google.co.pn | Google Pitcairn Islands
www.google.pr | Google Puerto Rico
www.google.com.pr | Google Puerto Rico
www.google.pt | Google Portugal
www.google.com.pt | Google Portugal
www.google.com.py | Google Paraguay
www.google.com.qa | Google 
www.google.ro | Google Romania
www.google.ru | Google Russia
www.google.com.ru | Google Russia
www.google.rw | Google Rwanda
www.google.com.sa | Google Saudi Arabia
www.google.com.sb | Google Solomon Islands
www.google.sc | Google Seychelles
www.google.com.sc | Google Seychelles
www.google.se | Google Sweden
www.google.sg | Google Singapore
www.google.com.sg | Google Singapore
www.google.sh | Google Saint Helena
www.google.si | Google Slovenia
www.google.sk | Google Slovakia
www.google.sm | Google San Marino
www.google.sn | Google Senegal
www.google.sr | Google Suriname
www.google.st | Google Sao Tome 
www.google.com.sv | Google El Savador
www.google.co.th | Google Thailand
www.google.com.tj | Google Tajikistan
www.google.tk | Google Tokelau
www.google.tm | Google Turkmenistan
www.google.to | Google Tonga
www.google.tp | Google East Timor
www.google.com.tr | Google Turkey
www.google.tt | Google Trinidad and Tobago
www.google.com.tt | Google Trinidad and Tobago
www.google.co.tt | Google Trinidad and Tobago
www.google.tv | Google Tuvalu
www.google.tw | Google Taiwan
www.google.com.tw | Google Taiwan
www.google.ug | Google Uganda
www.google.co.ug | Google Uganda
www.google.co.uk | Google UK
www.google.us | Google US
www.google.com.uy | Google Uruguay
www.google.uz | Google Uzbekistan
www.google.com.uz | Google Uzbekistan 
www.google.co.uz | Google Uzbekistan
www.google.com.ve | Google Venezuela
www.google.co.ve | Google Venezuela
www.google.vg | Google British Virgin Islands
www.google.com.vi | Google US Virgin Islands
www.google.co.vi | Google US Virgin Islands
www.google.vn | Google Vietnam
www.google.com.vn | Google Vietnam
www.google.vu | Google Vanuatu
www.google.ws | Google Samoa
www.google.com.ws | Google Samoa
www.google.co.za | Google	South Africa 
www.google.co.zm | Google Zambia
www.google.co.zw | Google Zimbabwe
www.google.com | Google
## -- other engines
uk.altavista.com | Altavista UK
altavista.com | Altavista
search.msn.com | MSN
search.msn.co.uk | MSN UK
search.lycos.co.uk | Lycos UK
search.lycos.com | Lycos
uk.search.yahoo.com | Yahoo! UK
search.yahoo.com | Yahoo!
search.yahoo.jp | Yahoo! Japan
www.mirago.co.uk | Mirago UK
uk.ask.com | Ask UK
www.ask.com | Ask dot com
www.netscape.com | Netscape
search.aol.co.uk | AOL UK
www.tiscali.co.uk | Tiscali UK
www.mamma.com | Mamma
blogs.icerocket.com | IceRocket
www.hotbot.com | HotBot
suche.web.de | Suche DE
suche.fireball.de | Fireball DE
www.alltheweb.com | AllTheWeb
www.technorati.com | Technorati
www.feedster.com | Feedster
www.tesco.net | Tesco Search
gps.virgin.net | Virgin Search
search.bbc.co.uk | BBC Search
search.live.com | Live.com
search.mywebsearch.com | My Web Search
www.megasearching.net | Megasearching
www.blueyonder.co.uk | Blueyonder
search.orange.co.uk | Orange Search
search.ntlworld.com | NTLWorld
search.virginmedia.com | VirginMedia
as.starware.com | Starware
aolsearch.aol.com | AOL Search
search.arabia.msn.com | MSN Arabia
search.prodigy.msn.com | MSN Prodigy
buscador.terra.es | Terra ES
busca.orange.es | Orange ES
search.sweetim.com | Sweetim
search.conduit.com | Conduit
buscar.ozu.es | Ozu ES
buscador.lycos.es | Lycos ES
search.icq.com | ICQ dot com
search.yahoo.co.jp | Yahoo Japan
soso.com | Soso
search.myway.com | MyWay
ilmotore.com | ilMotore
ithaki.net | Ithaki
alice.it | Alice.it
excite.it | Excite IT
excite.com | Excite
lycos.it | Lycos IT
libero.it | Libero IT
thespider.it | TheSpider IT
godado.it | Godado (IT)
godado.com | Godado
kataweb.it | Kataweb IT
simpatico.ws | Simpatico IT
abacho.com | Abacho
categorico.it | Categorico IT
cuil.com | Cuil