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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 $VERSION = '0.2.5'; |
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#################################################################################################### |
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use strict; |
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use warnings; |
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#################################################################################################### |
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# load exporter and inherit from it |
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BEGIN { use Exporter qw(); our @ISA = qw(Exporter); } |
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# define our functions that will be exported |
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BEGIN { our @EXPORT = qw($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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#################################################################################################### |
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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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\[ |
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# fetch a name |
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$re_identifier |
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\s* |
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(?: |
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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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(?: |
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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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) |
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# has value |
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)? |
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# close attribute |
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\] |
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/x; |
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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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#################################################################################################### |
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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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#################################################################################################### |
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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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1; |