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#============================================================= -*-perl-*- |
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# XML::Schema::Instance |
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# DESCRIPTION |
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# Module implementing an object for representing instance documents. |
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# AUTHOR |
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# Andy Wardley |
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# |
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# COPYRIGHT |
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# Copyright (C) 2001 Canon Research Centre Europe Ltd. |
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# All Rights Reserved. |
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# |
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# This module is free software; you can redistribute it and/or |
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# modify it under the same terms as Perl itself. |
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# |
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# REVISION |
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# $Id: Instance.pm,v 1.2 2001/12/20 13:26:27 abw Exp $ |
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# |
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#======================================================================== |
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package XML::Schema::Instance; |
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use strict; |
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use XML::Schema; |
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use vars qw( $VERSION $DEBUG $ERROR $ETYPE @MANDATORY ); |
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use base qw( XML::Schema::Base ); |
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$VERSION = sprintf("%d.%02d", q$Revision: 1.2 $ =~ /(\d+)\.(\d+)/); |
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$DEBUG = 0 unless defined $DEBUG; |
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$ERROR = ''; |
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$ETYPE = 'Instance'; |
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@MANDATORY = qw( schema ); |
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#------------------------------------------------------------------------ |
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# init(\%config) |
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# |
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# Initialiser method called by the base class new() method. |
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#------------------------------------------------------------------------ |
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sub init { |
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my ($self, $config) = @_; |
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$self->TRACE("config => ", $config) if $DEBUG; |
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my ($mand) = @{ $self->_baseargs( qw( @MANDATORY ) ) }; |
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$self->_mandatory($mand, $config) |
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|| return; |
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$self->{ _ID } = { }; |
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$self->{ _SCHEMA_STACK } = [ ]; |
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$self->{ _FACTORY } = $config->{ FACTORY } || $XML::Schema::FACTORY; |
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$self->{ content } = [ ]; |
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return $self; |
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} |
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#------------------------------------------------------------------------ |
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# id($id, $value) |
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# |
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# Stores the specified value as an ID within the instance document, |
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# indexed by $id. |
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#------------------------------------------------------------------------ |
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sub id { |
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my ($self, $id, $ref) = @_; |
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$self->TRACE("ID: ", $id, " => ", $ref) if $DEBUG; |
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return $self->error("no value defined, did you mean to call idref()?") |
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unless defined $ref; |
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return $self->error("an element is already defined with id '$id'") |
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if defined $self->{ _ID }->{ $id }; |
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$self->{ _ID }->{ $id } = $ref; |
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return 1; |
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} |
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#------------------------------------------------------------------------ |
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# idref($id) |
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# |
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# Returns the value of an ID previously specified via a call to id() |
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# or undef if the ID isn't defined, with an appropriate error message |
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# being set. |
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#------------------------------------------------------------------------ |
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sub idref { |
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my ($self, $idref) = @_; |
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$self->TRACE("IDREF: ", $idref) if $DEBUG; |
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return $self->{ _ID }->{ $idref } |
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|| $self->error("no such id: $idref"); |
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} |
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#------------------------------------------------------------------------ |
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# TODO: |
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# also need to implement entity and notation handlers... |
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# (see comments in XML::Schema::Type::Builtin header) |
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#------------------------------------------------------------------------ |
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#------------------------------------------------------------------------ |
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# schema_handler(...) |
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# |
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# Return a parser handler for parsing the top-level of the schema. |
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#------------------------------------------------------------------------ |
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sub schema_handler { |
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my $self = shift; |
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$self->TRACE() if $DEBUG; |
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my $schema = $self->{ schema }; |
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return $schema->handler(@_) |
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|| $self->error($schema->error()); |
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} |
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#------------------------------------------------------------------------ |
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# simple_handler(...) |
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# |
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# Return a parser handler for parsing a simple element. |
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#------------------------------------------------------------------------ |
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sub simple_handler { |
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my ($self, $type, $element) = @_; |
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if ($DEBUG) { |
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my $tid = ref($type) && UNIVERSAL::can($type, 'ID') |
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? $type->ID : ($type || ''); |
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my $eid = ref($element) && UNIVERSAL::can($element, 'ID') |
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? $element->ID : ($element || ''); |
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$self->TRACE("type => $tid, element => $eid"); |
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} |
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my $factory = $self->{ _FACTORY } |
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|| return $self->error("no factory defined"); |
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return $factory->create( simple_handler => { |
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type => $type, |
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element => $element, |
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}) || $self->error($factory->error()); |
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} |
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#------------------------------------------------------------------------ |
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# complex_handler($type, $element) |
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# |
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# Return a parser handler for parsing a complex element. |
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#------------------------------------------------------------------------ |
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sub complex_handler { |
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my ($self, $type, $element) = @_; |
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$self->TRACE("type => ", $type->ID, ", element => ", $element->ID) if $DEBUG; |
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my $factory = $self->{ _FACTORY } |
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|| return $self->error("no factory defined"); |
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return $factory->create( complex_handler => { |
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type => $type, |
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element => $element, |
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}) || $self->error($factory->error()); |
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} |
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#------------------------------------------------------------------------ |
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# schema_push($handler) |
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# |
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# Push a parser handler onto the top of the internal schema stack, |
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# making it the target for all subsequent parse events until masked |
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# by another handler pushed on top of it, or popped off the stack |
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# by a call to schema_pop() (e.g. at the element end tag) |
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#------------------------------------------------------------------------ |
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sub schema_push { |
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my ($self, $node) = @_; |
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push(@{ $self->{ _SCHEMA_STACK } }, $node); |
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} |
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#------------------------------------------------------------------------ |
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# schema_pop() |
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# |
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# Pop the top parser handler from the internal schema stack and return it. |
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#------------------------------------------------------------------------ |
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192
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sub schema_pop { |
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pop(@{ $_[0]->{ _SCHEMA_STACK } }); |
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} |
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#------------------------------------------------------------------------ |
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# schema_top() |
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# |
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# Return the top item on the internal schema stack. |
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#------------------------------------------------------------------------ |
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203
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sub schema_top { |
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$_[0]->{ _SCHEMA_STACK }->[-1]; |
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} |
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208
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#------------------------------------------------------------------------ |
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# expat_handlers() |
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# |
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# Returns a hash array for configuring XML::Parser to correctly use |
212
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# this schema instance as a recipient of parse events. May return a |
213
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# hash ref as { Init => ..., Start => ..., etc. } in which case the |
214
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# instance class is automatically used by the caller as the 'Style' |
215
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# value leading to this class receiving parse events. Alternately, a |
216
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# hash of the form { Style => 'MyClass', Handlers => { Start => ... } } |
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# may be passed to explicitly denote the intended recipient. |
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#------------------------------------------------------------------------ |
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220
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sub expat_handlers { |
221
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0
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0
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my $self = shift; |
222
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0
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my $schema = $self->{ schema }; |
223
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224
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0
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0
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my $handler = $self->schema_handler() |
225
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|| return; |
226
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227
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0
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0
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$handler->start_element($self) |
228
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|| return $self->error($handler->error()); |
229
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230
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return { |
231
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Init => sub { |
232
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0
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0
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0
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$self->DEBUG($self->ID, "->[Init] $self\n") if $DEBUG; |
233
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0
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my $expat = shift; |
234
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0
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|
$expat->{ _SCHEMA_INSTANCE } = $self; |
235
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0
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$expat->{ _SCHEMA_TEXT } = ''; |
236
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0
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$self->{ _SCHEMA_STACK } = [ $handler ]; |
237
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0
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$self->{ _SCHEMA_EXPAT } = $expat; |
238
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}, |
239
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0
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}; |
240
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} |
241
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242
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243
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#======================================================================== |
244
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# XML::Parser::Expat callbacks |
245
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#======================================================================== |
246
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247
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#------------------------------------------------------------------------ |
248
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# Start($expat, $name, %attr) |
249
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#------------------------------------------------------------------------ |
250
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251
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sub Start { |
252
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0
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0
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0
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|
my ($expat, $name, %attr) = @_; |
253
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0
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|
my $self = $expat->{ _SCHEMA_INSTANCE }; |
254
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0
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|
my $stack = $self->{ _SCHEMA_STACK }; |
255
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0
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|
my $parent = $stack->[-1]; |
256
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0
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|
my $text; |
257
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258
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0
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0
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|
if ($DEBUG) { |
259
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0
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|
my $attr = join(' ', map { "$_=\"$attr{$_}\"" } keys %attr); |
|
0
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260
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0
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0
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|
|
$attr = " $attr" if $attr; |
261
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0
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|
|
|
$self->TRACE("[Start] <$name$attr>"); |
262
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|
} |
263
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|
264
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|
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|
|
# flush any character content |
265
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0
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0
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|
|
if (length ($text = $expat->{ _SCHEMA_TEXT })) { |
266
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0
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0
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|
|
$self->TRACE("flushing text: '", $self->_text_snippet($text), "'") if $DEBUG; |
267
|
0
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0
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|
|
$parent->text($self, $text) |
268
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|
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|
|
|| $self->parse_error($parent->error()); |
269
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0
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|
$expat->{ _SCHEMA_TEXT } = ''; |
270
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|
} |
271
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272
|
0
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0
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|
|
my $child = $parent->start_child($self, $name, \%attr) |
273
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|
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|
|
|| return $self->parse_error($parent->error()); |
274
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|
275
|
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|
|
my $handler = $child->{ handler } |
276
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|
|
|
|| return $self->parse_error($child->{ error } || |
277
|
0
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|
0
|
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|
|
"no child handler defined"); |
278
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|
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279
|
0
|
0
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|
|
$handler->start_element($self, @$child{ qw( name attributes ) }) |
280
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|
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|
|
|
|
|| $self->parse_error($handler->error()); |
281
|
|
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|
282
|
0
|
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|
|
|
push(@$stack, $handler); |
283
|
|
|
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|
|
|
} |
284
|
|
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|
|
285
|
|
|
|
|
|
|
|
286
|
|
|
|
|
|
|
#------------------------------------------------------------------------ |
287
|
|
|
|
|
|
|
# End($expat, $name) |
288
|
|
|
|
|
|
|
#------------------------------------------------------------------------ |
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
sub End { |
291
|
0
|
|
|
0
|
0
|
|
my ($expat, $name) = @_; |
292
|
0
|
|
|
|
|
|
my $self = $expat->{ _SCHEMA_INSTANCE }; |
293
|
0
|
|
|
|
|
|
my $stack = $self->{ _SCHEMA_STACK }; |
294
|
0
|
|
|
|
|
|
my $element = pop( @$stack ); |
295
|
0
|
|
|
|
|
|
my $text; |
296
|
|
|
|
|
|
|
|
297
|
0
|
0
|
|
|
|
|
$self->TRACE("[End] $name>") if $DEBUG; |
298
|
|
|
|
|
|
|
|
299
|
|
|
|
|
|
|
# flush any character content |
300
|
0
|
0
|
|
|
|
|
if (length ($text = $expat->{ _SCHEMA_TEXT })) { |
301
|
0
|
0
|
|
|
|
|
$self->TRACE("flushing text: '", $self->_text_snippet($text), "'") if $DEBUG; |
302
|
0
|
0
|
|
|
|
|
$element->text($self, $text) |
303
|
|
|
|
|
|
|
|| $self->parse_error($element->error()); |
304
|
0
|
|
|
|
|
|
$expat->{ _SCHEMA_TEXT } = ''; |
305
|
|
|
|
|
|
|
} |
306
|
|
|
|
|
|
|
|
307
|
0
|
|
0
|
|
|
|
my $child = $element->end_element($self, $name) |
308
|
|
|
|
|
|
|
|| return $self->parse_error($element->error()); |
309
|
|
|
|
|
|
|
|
310
|
0
|
|
0
|
|
|
|
my $parent = $stack->[-1] |
311
|
|
|
|
|
|
|
|| $self->parse_error("no parent element for $name"); |
312
|
|
|
|
|
|
|
|
313
|
0
|
|
0
|
|
|
|
return $parent->end_child($self, $name, $child) |
314
|
|
|
|
|
|
|
|| $self->error($parent->error()); |
315
|
|
|
|
|
|
|
} |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
|
318
|
|
|
|
|
|
|
#------------------------------------------------------------------------ |
319
|
|
|
|
|
|
|
# Char($expat, $char) |
320
|
|
|
|
|
|
|
#------------------------------------------------------------------------ |
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
sub Char { |
323
|
0
|
|
|
0
|
0
|
|
my ($expat, $char) = @_; |
324
|
|
|
|
|
|
|
|
325
|
|
|
|
|
|
|
# $self->TRACE("[Char] '$char'") if $DEBUG; |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
# push character content onto buffer |
328
|
0
|
|
|
|
|
|
$expat->{ _SCHEMA_TEXT } .= $char; |
329
|
|
|
|
|
|
|
} |
330
|
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
#------------------------------------------------------------------------ |
333
|
|
|
|
|
|
|
# Final($expat) |
334
|
|
|
|
|
|
|
#------------------------------------------------------------------------ |
335
|
|
|
|
|
|
|
|
336
|
|
|
|
|
|
|
sub Final { |
337
|
0
|
|
|
0
|
0
|
|
my $expat = shift; |
338
|
0
|
|
|
|
|
|
my $self = $expat->{ _SCHEMA_INSTANCE }; |
339
|
0
|
|
|
|
|
|
my $stack = $self->{ _SCHEMA_STACK }; |
340
|
0
|
|
|
|
|
|
my $element = pop( @$stack ); |
341
|
|
|
|
|
|
|
|
342
|
0
|
0
|
|
|
|
|
$self->TRACE("[Final] calling $element->end()\n") if $DEBUG; |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
# TODO: may need to flush text? |
345
|
|
|
|
|
|
|
|
346
|
0
|
|
|
|
|
|
delete $expat->{ _SCHEMA_INSTANCE }; |
347
|
0
|
|
|
|
|
|
delete $expat->{ _SCHEMA_TEXT }; |
348
|
0
|
|
|
|
|
|
delete $self->{ _SCHEMA_EXPAT }; |
349
|
0
|
|
|
|
|
|
delete $self->{ _SCHEMA_STACK }; |
350
|
|
|
|
|
|
|
|
351
|
|
|
|
|
|
|
|
352
|
0
|
|
0
|
|
|
|
my $result = $element->end_element($self) |
353
|
|
|
|
|
|
|
|| $self->parse_error($element->error()); |
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
# $self->throw("instance finally popped off foreign handler (got $element not $self") |
356
|
|
|
|
|
|
|
# unless $element == $self; |
357
|
|
|
|
|
|
|
|
358
|
0
|
|
|
|
|
|
return $result; |
359
|
|
|
|
|
|
|
} |
360
|
|
|
|
|
|
|
|
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
sub parse_error { |
363
|
0
|
|
|
0
|
0
|
|
my $self = shift; |
364
|
0
|
|
|
|
|
|
my $msg = join('', @_); |
365
|
0
|
|
|
|
|
|
my $expat = $self->{ _SCHEMA_EXPAT }; |
366
|
0
|
0
|
|
|
|
|
die "?? lost expat instance ??\n" unless $expat; |
367
|
0
|
|
|
|
|
|
die $expat->position_in_context(4), "\n$msg\n"; |
368
|
|
|
|
|
|
|
# $expat->xpcroak($msg); |
369
|
|
|
|
|
|
|
} |
370
|
|
|
|
|
|
|
|
371
|
|
|
|
|
|
|
1; |
372
|
|
|
|
|
|
|
|