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package XML::SemanticDiff; |
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our $AUTHORITY = 'cpan:SHLOMIF'; |
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786836
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use strict; |
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use warnings; |
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use 5.012; |
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our $VERSION = '1.0006'; |
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use XML::Parser; |
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sub new { |
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my ($proto, %args) = @_; |
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my $class = ref($proto) || $proto; |
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my $self = \%args; |
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require XML::SemanticDiff::BasicHandler unless defined $args{diffhandler}; |
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bless ($self, $class); |
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return $self; |
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} |
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sub _is_file |
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{ |
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my ($self, $specifier) = @_; |
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return $specifier !~ /\n/g && -f $specifier; |
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} |
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sub _get_pathfinder_obj { |
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my $self = shift; |
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return XML::SemanticDiff::PathFinder::Obj->new(); |
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} |
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sub read_xml { |
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my $self = shift; |
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my ($xml_specifier) = @_; |
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if (ref($xml_specifier) eq 'HASH') |
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{ |
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return $xml_specifier; |
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} |
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else |
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{ |
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$self->{path_finder_obj} = $self->_get_pathfinder_obj(); |
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my $p = XML::Parser->new( |
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Style => 'Stream', |
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Pkg => 'XML::SemanticDiff::PathFinder', |
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'Non-Expat-Options' => $self, |
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Namespaces => 1 |
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); |
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57
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my $ret = |
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$self->_is_file($xml_specifier) |
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? $p->parsefile($xml_specifier) |
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: $p->parse($xml_specifier) |
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; |
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$self->{path_finder_obj} = undef; |
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return $ret; |
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} |
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} |
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sub _same_namespace |
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{ |
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my ($self, $to, $from) = @_; |
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73
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my $t_e = exists($to->{NamespaceURI}); |
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my $f_e = exists($from->{NamespaceURI}); |
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if (!$t_e && !$f_e) |
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{ |
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return 1; |
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} |
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elsif ($t_e && $f_e) |
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{ |
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return ($to->{NamespaceURI} eq $from->{NamespaceURI}); |
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} |
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else |
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{ |
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return 0; |
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} |
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} |
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89
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sub _match_xpath { |
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my $self = shift; |
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my ($xpath, $flat_name) = @_; |
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my @x_way = split /\//, $xpath; |
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my @f_way = split /\//, $flat_name; |
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for my $i (0..$#x_way) { |
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$x_way[$i]=~s/.*?://g; |
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} |
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for my $i (0..$#f_way) { |
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$f_way[$i]=~s/\[.*?\]$//g; |
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} |
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return 0 if $#x_way > $#f_way; |
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for my $i (0..$#x_way) { |
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if ($x_way[$i] ne $f_way[$i]) { |
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return 0; |
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} |
105
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} |
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return 1; |
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} |
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109
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# Okay, it's pretty basic... |
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# |
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# We flatten each doc tree to a Perl hash where the keys are "fully qualified" |
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# XPath expressions (/root[1]/element[3]) that represent the unique location |
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# of each XML element, then compare the two hashes. |
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# |
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# Just loop over all the elements of the first hash- if the same key exists |
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# in the second, you compare the text and attributes and delete it. Any |
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# keys not found in the second hash are declared 'missing', and any keys leftover |
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# in the second hash after looping through the elements in the first are 'rogues'. |
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120
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sub compare { |
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my $self = shift; |
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my ($from_xml, $to_xml) = @_; |
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124
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my $from_doc = $self->read_xml($from_xml); |
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my $to_doc = $self->read_xml($to_xml); |
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127
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my @warnings = (); |
128
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129
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my $handler = $self->{diffhandler} || XML::SemanticDiff::BasicHandler->new(%$self); |
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131
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# drop away nodes matching xpaths to be ignored |
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if (defined $self->{ignorexpath}) { |
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my $ignore = $self->{ignorexpath}; |
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for my $path (@$ignore) { |
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for my $ref ($from_doc, $to_doc) { |
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for my $key (keys %$ref) { |
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if ($self->_match_xpath($path, $key)) { |
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delete $ref->{$key}; |
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} |
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} |
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} |
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} |
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} |
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145
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# fire the init handler |
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push (@warnings, $handler->init($self)) if $handler->can('init'); |
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148
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# loop the elements |
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foreach my $element (sort keys (%$from_doc)) { |
150
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151
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# element existence check |
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if (defined $to_doc->{$element}) { |
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154
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# element value test |
155
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unless ($from_doc->{$element}->{TextChecksum} eq $to_doc->{$element}->{TextChecksum}) { |
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push (@warnings, $handler->element_value($element, |
157
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$to_doc->{$element}, |
158
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$from_doc->{$element})) |
159
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if $handler->can('element_value'); |
160
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} |
161
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162
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# namespace test |
163
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unless ($self->_same_namespace($from_doc->{$element},$to_doc->{$element})) { |
164
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push (@warnings, $handler->namespace_uri($element, |
165
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$to_doc->{$element}, |
166
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$from_doc->{$element})) |
167
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if $handler->can('namespace_uri'); |
168
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} |
169
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170
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# attribute tests |
171
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foreach my $attr (keys(%{$from_doc->{$element}->{Attributes}})) { |
172
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173
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# attr existence check |
174
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if (defined ($to_doc->{$element}->{Attributes}->{$attr})) { |
175
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176
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# attr value test |
177
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if ($to_doc->{$element}->{Attributes}->{$attr} ne $from_doc->{$element}->{Attributes}->{$attr}){ |
178
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push (@warnings, $handler->attribute_value($attr, |
179
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$element, |
180
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$to_doc->{$element}, |
181
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$from_doc->{$element})) |
182
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if $handler->can('attribute_value'); |
183
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} |
184
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delete $to_doc->{$element}->{Attributes}->{$attr}; |
185
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} |
186
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else { |
187
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push (@warnings, $handler->missing_attribute($attr, |
188
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$element, |
189
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$to_doc->{$element}, |
190
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$from_doc->{$element})) |
191
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if $handler->can('missing_attribute'); |
192
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} |
193
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} |
194
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195
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# rogue attrs |
196
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foreach my $leftover (keys(%{$to_doc->{$element}->{Attributes}})) { |
197
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push (@warnings, $handler->rogue_attribute($leftover, |
198
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$element, |
199
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$to_doc->{$element}, |
200
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$from_doc->{$element})) |
201
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if $handler->can('rogue_attribute'); |
202
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} |
203
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204
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delete $to_doc->{$element}; |
205
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} |
206
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else { |
207
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push (@warnings, $handler->missing_element($element, $from_doc->{$element})) |
208
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if $handler->can('missing_element'); |
209
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} |
210
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} |
211
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212
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# rogue elements |
213
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foreach my $leftover ( keys (%$to_doc) ) { |
214
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push (@warnings, $handler->rogue_element($leftover, $to_doc->{$leftover})) |
215
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if $handler->can('rogue_element'); |
216
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} |
217
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218
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push (@warnings, $handler->final($self)) if $handler->can('final'); |
219
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220
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return @warnings; |
221
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} |
222
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223
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1; |
224
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225
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package XML::SemanticDiff::PathFinder; |
226
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our $AUTHORITY = 'cpan:SHLOMIF'; |
227
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228
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foreach my $func (qw(StartTag EndTag Text StartDocument EndDocument PI)) |
229
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{ |
230
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no strict 'refs'; |
231
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|
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*{__PACKAGE__.'::'.$func} = sub { |
232
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my $expat = shift; |
233
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return $expat->{'Non-Expat-Options'}->{path_finder_obj}->$func( |
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$expat, @_ |
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); |
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}; |
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} |
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package XML::SemanticDiff::PathFinder::Obj; |
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our $AUTHORITY = 'cpan:SHLOMIF'; |
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use strict; |
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use Digest::MD5 qw(md5_base64); |
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use Encode qw(encode_utf8); |
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foreach my $accessor (qw(descendents char_accumulator doc |
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opts xml_context PI_position_index)) |
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{ |
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no strict 'refs'; |
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*{__PACKAGE__.'::'.$accessor} = sub { |
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my $self = shift; |
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if (@_) |
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{ |
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$self->{$accessor} = shift; |
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} |
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return $self->{$accessor}; |
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}; |
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} |
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# PI_position_index is the position index for the PI's below - the processing |
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# instructions. |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless $self, $class; |
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$self->_init(@_); |
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return $self; |
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} |
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sub _init { |
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return 0; |
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} |
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sub StartTag { |
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my ($self, $expat, $element) = @_; |
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284
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285
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my %attrs = %_; |
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287
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my @context = $expat->context; |
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my $context_length = scalar (@context); |
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my $parent = $context[$context_length -1]; |
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push (@{$self->descendents()->{$parent}}, $element) if $parent; |
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292
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my $last_ctx_elem = $self->xml_context()->[-1] || { position_index => {}}; |
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294
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push @{$self->xml_context()}, |
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{ |
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element => "$element", |
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'index' => ++$last_ctx_elem->{position_index}->{"$element"}, |
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position_index => {}, |
299
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}; |
300
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301
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my $test_context; |
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303
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# if (@context){ |
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# $test_context = '/' . join ('/', map { $_ . '[' . $position_index->{$_} . ']' } @context); |
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# } |
306
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307
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# $test_context .= '/' . $element . '[' . $position_index->{$element} . ']'; |
308
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309
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$test_context = $self->_calc_test_context(); |
310
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311
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$self->doc()->{$test_context} = |
312
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{ |
313
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NamespaceURI => ($expat->namespace($element) || ""), |
314
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Attributes => \%attrs, |
315
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($self->opts()->{keeplinenums} |
316
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? ( TagStart => $expat->current_line) |
317
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: () |
318
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), |
319
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}; |
320
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} |
321
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322
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|
sub _calc_test_context |
323
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{ |
324
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|
my $self = shift; |
325
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326
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|
return |
327
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|
|
join("", |
328
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|
|
map { "/". $_->{'element'} . "[" . $_->{'index'} . "]" } |
329
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|
@{$self->xml_context()} |
330
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|
); |
331
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|
} |
332
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333
|
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|
sub EndTag { |
334
|
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|
|
my ($self, $expat, $element) = @_; |
335
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336
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|
|
my @context = $expat->context; |
337
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338
|
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|
|
# if (@context){ |
339
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|
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|
|
# $test_context = '/' . join ('/', map { $_ . '[' . $position_index->{$_} . ']' } @context); |
340
|
|
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|
|
|
|
#} |
341
|
|
|
|
|
|
|
# $test_context .= '/' . $element . '[' . $position_index->{$element} . ']'; |
342
|
|
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|
|
|
343
|
|
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|
|
|
|
my $test_context = $self->_calc_test_context(); |
344
|
|
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|
|
345
|
|
|
|
|
|
|
my $text; |
346
|
|
|
|
|
|
|
if ( defined( $self->char_accumulator()->{$element} )) { |
347
|
|
|
|
|
|
|
$text = $self->char_accumulator()->{$element}; |
348
|
|
|
|
|
|
|
delete $self->char_accumulator()->{$element}; |
349
|
|
|
|
|
|
|
} |
350
|
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|
|
# This isn't the correct thing to do. If the before or after element |
351
|
|
|
|
|
|
|
# had and 'o' and the other was undef, we would fail to find any differences |
352
|
|
|
|
|
|
|
# Instead, when a value is undef we should be setting the the checksum |
353
|
|
|
|
|
|
|
# to the value for an empty string since undef and empty string for a |
354
|
|
|
|
|
|
|
# element are the same ( vs ) |
355
|
|
|
|
|
|
|
#$text ||= 'o'; |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
# warn "text is '$text' \n"; |
358
|
|
|
|
|
|
|
# my $ctx = Digest::MD5->new; |
359
|
|
|
|
|
|
|
# $ctx->add("$text"); |
360
|
|
|
|
|
|
|
# $self->doc()->{"$test_context"}->{TextChecksum} = $ctx->b64digest; |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
# In XML, a null(undef) value and an empty string should be treaded the same. |
363
|
|
|
|
|
|
|
# Therefore, when the element is undef, we should set the TextChecksum to the same |
364
|
|
|
|
|
|
|
# as an empty string. |
365
|
|
|
|
|
|
|
$self->doc()->{"$test_context"}->{TextChecksum} = |
366
|
|
|
|
|
|
|
md5_base64( |
367
|
|
|
|
|
|
|
encode_utf8( |
368
|
|
|
|
|
|
|
(defined $text) ? "$text" : "" |
369
|
|
|
|
|
|
|
) |
370
|
|
|
|
|
|
|
); |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
if ($self->opts()->{keepdata}) { |
373
|
|
|
|
|
|
|
$self->doc()->{"$test_context"}->{CData} = $text; |
374
|
|
|
|
|
|
|
} |
375
|
|
|
|
|
|
|
|
376
|
|
|
|
|
|
|
|
377
|
|
|
|
|
|
|
if (defined ( $self->descendents()->{$element})) { |
378
|
|
|
|
|
|
|
my $seen = {}; |
379
|
|
|
|
|
|
|
foreach my $child (@{$self->descendents()->{$element}}) { |
380
|
|
|
|
|
|
|
next if $seen->{$child}; |
381
|
|
|
|
|
|
|
$seen->{$child}++; |
382
|
|
|
|
|
|
|
} |
383
|
|
|
|
|
|
|
} |
384
|
|
|
|
|
|
|
|
385
|
|
|
|
|
|
|
$self->doc()->{"$test_context"}->{TagEnd} = $expat->current_line if $self->opts()->{keeplinenums}; |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
pop(@{$self->xml_context()}); |
388
|
|
|
|
|
|
|
} |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
sub Text { |
391
|
|
|
|
|
|
|
my $self = shift; |
392
|
|
|
|
|
|
|
my $expat = shift; |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
my $element = $expat->current_element; |
395
|
|
|
|
|
|
|
my $char = $_; |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
$char =~ s/^\s*//; |
398
|
|
|
|
|
|
|
$char =~ s/\s*$//; |
399
|
|
|
|
|
|
|
$char =~ s/\s+/ /g; |
400
|
|
|
|
|
|
|
# We should add any character that isn't undef, so check |
401
|
|
|
|
|
|
|
# for defined here instead of checking if the value is true |
402
|
|
|
|
|
|
|
$self->char_accumulator()->{$element} .= $char if defined($char); |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
} |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
sub StartDocument { |
407
|
|
|
|
|
|
|
my $self = shift; |
408
|
|
|
|
|
|
|
my $expat = shift; |
409
|
|
|
|
|
|
|
$self->doc({}); |
410
|
|
|
|
|
|
|
$self->descendents({}); |
411
|
|
|
|
|
|
|
$self->char_accumulator({}); |
412
|
|
|
|
|
|
|
$self->opts($expat->{'Non-Expat-Options'}); |
413
|
|
|
|
|
|
|
$self->xml_context([]); |
414
|
|
|
|
|
|
|
$self->PI_position_index({}); |
415
|
|
|
|
|
|
|
} |
416
|
|
|
|
|
|
|
|
417
|
|
|
|
|
|
|
sub EndDocument { |
418
|
|
|
|
|
|
|
my $self = shift; |
419
|
|
|
|
|
|
|
|
420
|
|
|
|
|
|
|
return $self->doc(); |
421
|
|
|
|
|
|
|
} |
422
|
|
|
|
|
|
|
|
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
sub PI { |
425
|
|
|
|
|
|
|
my ($self, $expat, $target, $data) = @_; |
426
|
|
|
|
|
|
|
my $attrs = {}; |
427
|
|
|
|
|
|
|
$self->PI_position_index()->{$target}++; |
428
|
|
|
|
|
|
|
|
429
|
|
|
|
|
|
|
foreach my $pair (split /\s+/, $data) { |
430
|
|
|
|
|
|
|
$attrs->{$1} = $2 if $pair =~ /^(.+?)=["'](.+?)["']$/; |
431
|
|
|
|
|
|
|
} |
432
|
|
|
|
|
|
|
|
433
|
|
|
|
|
|
|
my $slug = '?' . $target . '[' . $self->PI_position_index()->{$target} . ']'; |
434
|
|
|
|
|
|
|
|
435
|
|
|
|
|
|
|
$self->doc()->{$slug} = |
436
|
|
|
|
|
|
|
{ |
437
|
|
|
|
|
|
|
Attributes => ($attrs || {}), |
438
|
|
|
|
|
|
|
TextChecksum => "1", |
439
|
|
|
|
|
|
|
NamespaceURI => "", |
440
|
|
|
|
|
|
|
( $self->opts()->{keeplinenums} |
441
|
|
|
|
|
|
|
? ( |
442
|
|
|
|
|
|
|
TagStart => $expat->current_line(), |
443
|
|
|
|
|
|
|
TagEnd => $expat->current_line(), |
444
|
|
|
|
|
|
|
) |
445
|
|
|
|
|
|
|
: () |
446
|
|
|
|
|
|
|
), |
447
|
|
|
|
|
|
|
}; |
448
|
|
|
|
|
|
|
} |
449
|
|
|
|
|
|
|
|
450
|
|
|
|
|
|
|
1; |
451
|
|
|
|
|
|
|
|
452
|
|
|
|
|
|
|
__END__ |