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 ###################################################################################################  | 
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 # Copyright 2013/2014 by Marcel Greter  | 
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 # This file is part of OCBNET-CSS3 (GPL3)  | 
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 ####################################################################################################  | 
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 # regular expressions to match css2/css3 selectors  | 
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 ####################################################################################################  | 
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 package OCBNET::CSS3::Regex::Selectors;  | 
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 ####################################################################################################  | 
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 our $VERSION = '0.2.5';  | 
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 ####################################################################################################  | 
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 use strict;  | 
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 use warnings;  | 
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 # load exporter and inherit from it  | 
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 BEGIN { use Exporter qw(); our @ISA = qw(Exporter); }  | 
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 # define our functions that will be exported  | 
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 BEGIN { our @EXPORT = qw($re_selector_rules); }  | 
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 # define our functions than can be exported  | 
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 BEGIN { our @EXPORT_OK = qw($re_selector_rule $re_options); }  | 
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 use OCBNET::CSS3::Regex::Base;  | 
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 ####################################################################################################  | 
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 # create matchers for the various css selector types  | 
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 our $re_id = qr/\#$re_identifier/; # select single id  | 
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 our $re_tag = qr/(?:$re_identifier|\*)/; # select single tag  | 
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 our $re_class = qr/\.$re_identifier/; # select single class  | 
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 our $re_pseudo = qr/\:{1,2}$re_identifier/; # select single pseudo  | 
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 ####################################################################################################  | 
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 # select attributes and values  | 
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 # advanced css2/css3 selectors  | 
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 our $re_attr = qr/  | 
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 	# open attribute  | 
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 		# fetch a name  | 
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 		$re_identifier  | 
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 		\s*  | 
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 			# operator prefix  | 
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 			[\~\^\$\*\|]?  | 
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 			# the equal sign  | 
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 			\s* = \s*  | 
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 			# find value  | 
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 				# quoted string  | 
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 				  \' $re_apo \'  | 
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 				| \" $re_quot \"  | 
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 				  # escape char sequence  | 
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 				| (?: [^\)\\]+ | \\. )*  | 
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 			# has value  | 
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 		)?  | 
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 	# close attribute  | 
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 ####################################################################################################  | 
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 # create expression to match a single rule  | 
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 # example : DIV#id.class1.class2:hover  | 
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 our $re_selector = qr/(?:  | 
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 	  \*  | 
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 	| $re_attr* $re_pseudo+  | 
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 	| $re_class+ $re_attr* $re_pseudo*  | 
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 	| $re_id $re_class* $re_attr* $re_pseudo*  | 
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 	| $re_tag $re_id? $re_class* $re_attr* $re_pseudo*  | 
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 )/x;  | 
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 # create expression to match complex rules  | 
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 # example : #id DIV.class FORM A:hover  | 
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 our $re_selector_rule = qr/$re_selector(?:(?:\s*[\>\+\~]\s*|\s+)$re_selector)*/;  | 
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 # create expression to match multiple complex rules  | 
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 # example : #id DIV.class FORM A:hover, BODY DIV.header  | 
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 our $re_selector_rules = qr/$re_selector_rule(?:\s*,\s*$re_selector_rule)*/;  | 
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 ####################################################################################################  | 
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 ####################################################################################################  | 
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