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#----------------------------------------------------------------- |
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# XML::SemanticCompare |
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# Author: Edward Kawas , |
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# For copyright and disclaimer see below. |
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# |
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# $Id: SemanticCompare.pm,v 1.1 2009-12-01 21:12:28 ubuntu Exp $ |
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#----------------------------------------------------------------- |
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package XML::SemanticCompare; |
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use strict; |
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use Carp; |
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use vars qw /$VERSION/; |
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$VERSION = sprintf "%d.%02d", q$Revision: 1.1 $ =~ /: (\d+)\.(\d+)/; |
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use vars qw($AUTOLOAD); |
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#----------------------------------------------------------------- |
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# load all modules needed |
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#----------------------------------------------------------------- |
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use XML::Simple; |
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use XML::LibXML; |
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use XML::SemanticCompare::SAX; |
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use Data::Dumper; |
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=head1 NAME |
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XML::SemanticCompare - compare 2 XML trees semantically |
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=head1 SYNOPSIS |
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use XML::SemanticCompare; |
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my $x = XML::SemanticCompare->new; |
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# compare 2 different files |
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my $isSame = $x->compare($control_xml, $test_xml); |
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# are they the same |
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print "XML matches!\n" |
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if $isSame; |
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print "XML files are semantically different!\n" |
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unless $isSame; |
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# get the diffs and print them out |
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my $diffs_arrayref = $x->diff( $control_xml, $test_xml ); |
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print "Diff: $_\n" foreach (@$diffs_arrayref); |
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# test xpath statement against XML |
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my $success = $x->test_xpath($xpath, $test_xml); |
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print "xpath success!\n" if $success; |
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=head1 DESCRIPTION |
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This module is used for semantically comparing XML documents. |
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=cut |
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=head1 AUTHORS |
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Edward Kawas (edward.kawas+xml-semantic-compare@gmail.com) |
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=cut |
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#----------------------------------------------------------------- |
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# AUTOLOAD |
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#----------------------------------------------------------------- |
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sub AUTOLOAD { |
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my $self = shift; |
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my $type = ref($self) |
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or croak("$self is not an object"); |
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my $name = $AUTOLOAD; |
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$name =~ s/.*://; # strip fully-qualified portion |
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unless ( exists $self->{_permitted}->{$name} ) { |
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croak("Can't access '$name' field in class $type"); |
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} |
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my $is_func = $self->{_permitted}->{$name}[1] =~ m/subroutine/i; |
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unless ($is_func) { |
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if (@_) { |
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my $val = shift; |
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$val = $val || ""; |
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return $self->{$name} = $val |
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if $self->{_permitted}->{$name}[1] =~ m/write/i; |
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croak("Can't write to '$name' field in class $type"); |
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} else { |
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return $self->{$name} |
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if $self->{_permitted}->{$name}[1] =~ m/read/i; |
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croak("Can't read '$name' field in class $type"); |
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} |
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} |
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# call a function |
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if ($is_func) { |
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if (@_) { |
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# parameterized call |
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my $x = $self->{_permitted}->{$name}[0]; |
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return $self->$x(@_); |
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} else { |
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# un-parameterized call |
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my $x = $self->{_permitted}->{$name}[0]; |
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return $self->$x(); |
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} |
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} |
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} |
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#----------------------------------------------------------------- |
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# new |
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#----------------------------------------------------------------- |
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sub new { |
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my ( $class, %options ) = @_; |
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# permitted fields |
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my %fields = ( |
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# attribute => [default, accessibility], |
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trim => [ 1, 'read/write' ], |
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use_attr => [ 1, 'read/write' ], |
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compare => [ "_test_xml", 'subroutine' ], |
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diff => [ "_get_xml_differences", 'subroutine' ], |
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test_xpath => [ "_test_xpath_statement", 'subroutine' ], |
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); |
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# create an object |
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my $self = { _permitted => \%fields }; |
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# set user values if they exist |
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$self->{trim} = $options{trim} || '1'; |
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$self->{use_attr} = $options{use_attr} || '1'; |
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bless $self, $class; |
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return $self; |
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} |
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#----------------------------------------------------------------- |
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# _test_xml: semantically compare $control_xml to $xml |
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#----------------------------------------------------------------- |
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sub _test_xml { |
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my ( $self, $control_xml, $xml ) = @_; |
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return undef unless $control_xml; |
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return undef unless $xml; |
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return undef if $control_xml =~ m//g; |
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return undef if $xml =~ m//g; |
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# check the root element name first |
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# this isnt very efficient, but until someone gives a better way ... |
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my $parser = XML::LibXML->new(); |
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my $cont_ele = undef; |
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my $test_ele = undef; |
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147
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# try parsing a string or a file |
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eval { $cont_ele = $parser->parse_string($control_xml); }; |
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eval { $cont_ele = $parser->parse_file($control_xml); } if $@; |
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return undef if $@; |
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eval { $test_ele = $parser->parse_string($xml); }; |
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eval { $test_ele = $parser->parse_file($xml); } if $@; |
153
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return undef if $@; |
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$cont_ele = $cont_ele->getDocumentElement; |
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$test_ele = $test_ele->getDocumentElement; |
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return undef |
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unless $cont_ele->localname eq $test_ele->localname |
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and $cont_ele->namespaceURI() eq $test_ele->namespaceURI(); |
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160
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# free memory |
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$parser = undef; |
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$cont_ele = undef; |
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$test_ele = undef; |
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165
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# done checking the root element |
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# create object with attributes |
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my $xml_simple = new XML::Simple( |
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ForceArray => 1, |
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ForceContent => 1, |
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# SuppressEmpty => 1, |
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keyattr => [], |
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) if $self->use_attr; |
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175
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# or create it without attributes |
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$xml_simple = new XML::Simple( |
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ForceArray => 1, |
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ForceContent => 1, |
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180
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# SuppressEmpty => 1, |
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NoAttr => 1, |
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keyattr => [], |
183
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) unless $self->use_attr; |
184
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185
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# read both XML files into a HASH |
186
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my $control = undef; |
187
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my $test = undef; |
188
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189
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# parse the control doc |
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eval { $control = $xml_simple->XMLin($control_xml); }; |
191
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192
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# check for invalid XML |
193
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return undef if $@; |
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195
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# parse the test doc |
196
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eval { $test = $xml_simple->XMLin($xml); }; |
197
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198
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# check for invalid XML |
199
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return undef if $@; |
200
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return $self->_compare_current_level( $control, $test, (), () ); |
201
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} |
202
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203
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#----------------------------------------------------------------- |
204
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# _compare_current_level: |
205
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# compares current level of data structures that represent XML |
206
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# documents. |
207
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# If the current level and all child levels match, a true value |
208
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# is returned. Otherwise, undef is returned. |
209
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#----------------------------------------------------------------- |
210
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sub _compare_current_level { |
211
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212
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# $control is current level in hash |
213
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# x_ns are the prefixes that we use |
214
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my ( $self, $control, $test, $control_ns, $test_ns ) = @_; |
215
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216
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# if either hash is missing they arent equal |
217
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return undef unless $control; |
218
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return undef unless $test; |
219
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220
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# get the namespace prefix and uris at the current level |
221
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# for each doc and remove from current level of hash |
222
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for my $key ( keys %$control ) { |
223
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next unless $key =~ m/^xmlns[:]?/; |
224
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225
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#next unless $key =~ m|^{http://www\.w3\.org/2000/xmlns/}[\w]*$|; |
226
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$control_ns->{''} = $control->{$key} if $key eq 'xmlns'; |
227
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$control_ns->{$1} = $control->{$key} if $key =~ m/xmlns\:(.*)$/g; |
228
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delete $control->{$key} if ref( $control->{$key} ) ne 'ARRAY'; |
229
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} |
230
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for my $key ( keys %$test ) { |
231
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next unless $key =~ m/^xmlns[:]?/; |
232
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233
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#next unless $key =~ m|^{http://www\.w3\.org/2000/xmlns/}[\w]*$|; |
234
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$test_ns->{''} = $test->{$key} if $key eq 'xmlns'; |
235
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$test_ns->{$1} = $test->{$key} if $key =~ m/xmlns\:(.*)$/g; |
236
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delete $test->{$key} if ref( $test->{$key} ) ne 'ARRAY'; |
237
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} |
238
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239
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# compare current level number of keys |
240
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return undef unless ( keys %$control ) == ( keys %$test ); |
241
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242
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# number of keys are equal, so start comparing! |
243
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my $matching_nodes = 0; |
244
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for my $key ( keys %$control ) { |
245
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my $success = 1; |
246
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for my $test_key ( keys %$test ) { |
247
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248
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# does the key exist? |
249
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# 'content' is a special case ... because its text content for a node |
250
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if ( |
251
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( $key eq $test_key and $key eq 'content' ) |
252
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or ( $self->_get_prefixed_key( $test_key, $test_ns ) eq |
253
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$self->_get_prefixed_key( $key, $control_ns ) |
254
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and $self->_get_prefixed_key( $key, $control_ns ) ) |
255
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) |
256
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{ |
257
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258
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# are we dealing with scalar values now or more nesting? |
259
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if ( ref( $control->{$key} ) eq 'ARRAY' ) { |
260
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261
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# both items should be an array |
262
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next unless ref( $test->{$test_key} ) eq 'ARRAY'; |
263
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264
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# array sizes should match here ... |
265
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next |
266
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|
unless @{ $control->{$key} } == @{ $test->{$test_key} }; |
267
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268
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|
# more nesting try matching child nodes |
269
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|
my $child_matches = 0; |
270
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|
foreach my $child ( @{ $control->{$key} } ) { |
271
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|
my $matched = undef; |
272
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|
|
foreach my $test_child ( @{ $test->{$test_key} } ) { |
273
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|
$matched = |
274
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|
|
$self->_compare_current_level( $child, |
275
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|
|
$test_child, $control_ns, $test_ns ); |
276
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|
|
$child_matches++ if $matched; |
277
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|
|
last if $matched; |
278
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|
|
} # end inner foreach |
279
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|
|
$matching_nodes++ |
280
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|
|
if @{ $control->{$key} } == $child_matches; |
281
|
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|
} |
282
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|
} else { |
283
|
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|
|
284
|
|
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|
|
|
|
# compare scalar values now |
285
|
|
|
|
|
|
|
# we dont care about whitespace, so we need to trim the text |
286
|
|
|
|
|
|
|
my $c_text = $self->_clear_whitespace( $control->{$key} ); |
287
|
|
|
|
|
|
|
my $t_text = $self->_clear_whitespace( $test->{$test_key} ); |
288
|
|
|
|
|
|
|
$matching_nodes++ if $c_text eq $t_text; |
289
|
|
|
|
|
|
|
last if $c_text eq $t_text; |
290
|
|
|
|
|
|
|
} |
291
|
|
|
|
|
|
|
} |
292
|
|
|
|
|
|
|
} #end inner for |
293
|
|
|
|
|
|
|
} |
294
|
|
|
|
|
|
|
|
295
|
|
|
|
|
|
|
# no differences found! |
296
|
|
|
|
|
|
|
return undef unless $matching_nodes == ( keys %$control ); |
297
|
|
|
|
|
|
|
return 1; |
298
|
|
|
|
|
|
|
} |
299
|
|
|
|
|
|
|
|
300
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
301
|
|
|
|
|
|
|
# _clear_whitespace: a whitespace trim function |
302
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
303
|
|
|
|
|
|
|
sub _clear_whitespace { |
304
|
|
|
|
|
|
|
my ( $self, $text ) = @_; |
305
|
|
|
|
|
|
|
return $text unless $self->trim; |
306
|
|
|
|
|
|
|
$text =~ s/^\s+//; |
307
|
|
|
|
|
|
|
$text =~ s/\s+$//; |
308
|
|
|
|
|
|
|
return $text; |
309
|
|
|
|
|
|
|
} |
310
|
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
312
|
|
|
|
|
|
|
# _get_prefixed_key: |
313
|
|
|
|
|
|
|
# goes through and tries to determine what the namespace URI |
314
|
|
|
|
|
|
|
# is for a prefix. |
315
|
|
|
|
|
|
|
# Once a URI is found, the prefix is swapped with URI and |
316
|
|
|
|
|
|
|
# returned. |
317
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
318
|
|
|
|
|
|
|
sub _get_prefixed_key { |
319
|
|
|
|
|
|
|
my ( $self, $key, $ns_hash ) = @_; |
320
|
|
|
|
|
|
|
my $prefixed_key = $key; |
321
|
|
|
|
|
|
|
my $prefix = $1 if $key =~ m/^([\w]+)\:.*/; |
322
|
|
|
|
|
|
|
$prefixed_key =~ s/$prefix/$ns_hash->{$prefix}/ |
323
|
|
|
|
|
|
|
if $prefix and $ns_hash->{$prefix}; |
324
|
|
|
|
|
|
|
|
325
|
|
|
|
|
|
|
# check for default xmlns |
326
|
|
|
|
|
|
|
$prefix = $prefix || ''; |
327
|
|
|
|
|
|
|
$prefixed_key = $ns_hash->{$prefix} . ":" . $key |
328
|
|
|
|
|
|
|
if not $prefix and defined $ns_hash->{$prefix}; |
329
|
|
|
|
|
|
|
return $prefixed_key; |
330
|
|
|
|
|
|
|
} |
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
333
|
|
|
|
|
|
|
# _test_xpath_statement: apply $xpath to $xml |
334
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
335
|
|
|
|
|
|
|
sub _test_xpath_statement { |
336
|
|
|
|
|
|
|
my ( $self, $xpath, $xml ) = @_; |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
# no xpath expression, nothing to test |
339
|
|
|
|
|
|
|
return undef if $xpath =~ m//g; |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
# empty xml, nothing to test |
342
|
|
|
|
|
|
|
return undef if $xml =~ m//g; |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
#instantiate a parser |
345
|
|
|
|
|
|
|
my $parser = XML::LibXML->new(); |
346
|
|
|
|
|
|
|
my $tree = undef; |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
# try parsing a string or a file |
349
|
|
|
|
|
|
|
eval { $tree = $parser->parse_string($xml); }; |
350
|
|
|
|
|
|
|
eval { $tree = $parser->parse_file($xml); } if $@; |
351
|
|
|
|
|
|
|
return undef if $@; |
352
|
|
|
|
|
|
|
my $root = $tree->getDocumentElement; |
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
# evaluate the xpath statement |
355
|
|
|
|
|
|
|
my $results = undef; |
356
|
|
|
|
|
|
|
eval { $results = $root->find($xpath); }; |
357
|
|
|
|
|
|
|
return undef if $@; |
358
|
|
|
|
|
|
|
|
359
|
|
|
|
|
|
|
# no results? |
360
|
|
|
|
|
|
|
return undef unless $results; |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
# got some hits! |
363
|
|
|
|
|
|
|
return 1; |
364
|
|
|
|
|
|
|
} |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
367
|
|
|
|
|
|
|
# _get_xml_differences: |
368
|
|
|
|
|
|
|
# get the differences between $xml and expected xml |
369
|
|
|
|
|
|
|
# and return them |
370
|
|
|
|
|
|
|
#----------------------------------------------------------------- |
371
|
|
|
|
|
|
|
sub _get_xml_differences { |
372
|
|
|
|
|
|
|
my ( $self, $control_xml, $test_xml ) = @_; |
373
|
|
|
|
|
|
|
my @diffs; |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
# create a parser |
376
|
|
|
|
|
|
|
my $parser = new XML::SemanticCompare::SAX(); |
377
|
|
|
|
|
|
|
|
378
|
|
|
|
|
|
|
# parse a file $xml is an array of strings representing the XML tree |
379
|
|
|
|
|
|
|
my $xml = undef; |
380
|
|
|
|
|
|
|
eval {$xml = $parser->parse ( method => 'string', data => $control_xml );}; |
381
|
|
|
|
|
|
|
eval {$xml = $parser->parse ( method => 'file', data => $control_xml );} unless $xml; |
382
|
|
|
|
|
|
|
#my %control = map {($_, 1)} @$xml; |
383
|
|
|
|
|
|
|
my $xml2 = undef; |
384
|
|
|
|
|
|
|
eval {$xml2 = $parser->parse ( method => 'string', data => $test_xml );}; |
385
|
|
|
|
|
|
|
eval {$xml2 = $parser->parse ( method => 'file', data => $test_xml );} unless $xml2; |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
foreach my $i ( 0 .. scalar(@$xml)-1) { |
388
|
|
|
|
|
|
|
next unless $xml->[$i]; |
389
|
|
|
|
|
|
|
foreach my $j (0 .. scalar(@$xml2)-1) { |
390
|
|
|
|
|
|
|
next unless $xml2->[$i]; |
391
|
|
|
|
|
|
|
if ($xml->[$i] eq $xml2->[$j]) { |
392
|
|
|
|
|
|
|
delete $xml->[$i]; |
393
|
|
|
|
|
|
|
delete $xml2->[$j]; |
394
|
|
|
|
|
|
|
last; |
395
|
|
|
|
|
|
|
} |
396
|
|
|
|
|
|
|
} |
397
|
|
|
|
|
|
|
} |
398
|
|
|
|
|
|
|
push @diffs, grep {defined $_} (@$xml, @$xml2); |
399
|
|
|
|
|
|
|
# items left over ... |
400
|
|
|
|
|
|
|
# grep {$control{$_} > 0} keys %control; |
401
|
|
|
|
|
|
|
return \@diffs; |
402
|
|
|
|
|
|
|
} |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
sub DESTROY { } |
405
|
|
|
|
|
|
|
1; |
406
|
|
|
|
|
|
|
__END__ |