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package WebSource::Filter::tests; |
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use strict; |
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use Carp; |
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use String::Approx qw/amatch/; |
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use WebSource::Filter; |
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our @ISA = ('WebSource::Filter'); |
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=head1 NAME |
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WebSource::Filter::tests - apply tests to filter xmlnodes |
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=head1 DESCRIPTION |
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The tests type of filter allows to declare a series of tests |
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and apply them to the input data in order to determine whether |
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or not to send it further on. |
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The tests are executed in the order of their declaration until one of them |
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matches. They associated action (keep or reject) is taken. By default the |
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action is to keep elements matching the test. If the element does not match |
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any tests it is rejected. |
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Current existing tests include : |
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=over 2 |
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=item B : Succeeds if a given XPATH expression returns a result |
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=item B : Succeeds if a given regular expression matches the input |
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=item B : Succeeds of a given string is approximately found in the |
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input |
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=back |
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=head1 SYNOPSIS |
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B |
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" action="keep" /> |
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match="" action="keep"/> |
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match="" modifiers="" action="reject" /> |
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... |
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=head1 METHODS |
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=cut |
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sub _init_ { |
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my $self = shift; |
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$self->SUPER::_init_; |
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$self->{wsdnode} or croak("No description node given"); |
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} |
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sub keep { |
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my $self = shift; |
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my $env = shift; |
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$self->log(3,"Testing"); |
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$env->type eq "object/dom-node" or return 0; # only works for dom-nodes |
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my @nodes = $self->{wsdnode}->findnodes("test"); |
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my $data = $env->data; |
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my $result = undef; |
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$self->log(3,"Found ",scalar(@nodes)," test nodes"); |
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while(!$result && @nodes) { |
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my $match = 0; |
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my $n = shift @nodes; |
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my $type = $n->getAttribute("type"); |
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$type or $type = "regexp"; |
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if($type eq "exists") { |
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my $select = $n->getAttribute("select"); |
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my @res = $data->findnodes($n->getAttribute("select")); |
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$match = (scalar(@res) > 0); |
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$self->log(5,"Existence with '$select' resulted in ", |
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scalar(@res)," nodes ($match)"); |
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} elsif($type eq "xpath") { |
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my $select = $n->getAttribute("select"); |
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$match = $data->find("boolean(".$n->getAttribute("select").")")->value(); |
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$self->log(5,"Xpath test with '$select' resulted in $match"); |
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} else { |
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my $str = $data->findvalue($n->getAttribute("select")); |
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my $pat = $n->getAttribute("match"); |
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if($type eq "regexp") { |
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$self->log(3,"Trying to match '$str' with m/$pat/i"); |
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$match = $str =~ m/$pat/i; |
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} elsif($type eq "approx") { |
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my $mod = $n->getAttribute("modifiers"); |
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$self->log(3,"Matching '$str' approximately against", |
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" pattern '$pat' with modifier string '$mod'"); |
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$match = amatch($pat,[ $mod ],$str); |
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} |
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} |
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if($match) { |
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my $action = $n->getAttribute("action"); |
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$action or $action = "keep"; |
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$result = $action; |
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$self->log(5,"Found a match, taking action : ",$result); |
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} |
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} |
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return ($result eq "keep"); |
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} |
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107
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=head1 SEE ALSO |
108
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109
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B, B |
110
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111
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=cut |
112
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113
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1; |