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#============================================================= -*-perl-*- |
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# XML::Schema::Content.pm |
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# DESCRIPTION |
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# Module implementing a class to represent a content model being either |
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# 'empty', having a 'simple' type, or a pair of particle and model type, |
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# which can be one of 'mixed' or 'element-only'. |
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# AUTHOR |
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# Andy Wardley |
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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: Content.pm,v 1.1.1.1 2001/08/29 14:30:17 abw Exp $ |
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#======================================================================== |
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package XML::Schema::Content; |
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use strict; |
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use XML::Schema; |
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use base qw( XML::Schema::Base ); |
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use vars qw( $VERSION $DEBUG $ERROR $ETYPE @ARGS ); |
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$VERSION = sprintf("%d.%02d", q$Revision: 1.1.1.1 $ =~ /(\d+)\.(\d+)/); |
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$DEBUG = 0 unless defined $DEBUG; |
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$ERROR = ''; |
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$ETYPE = 'content'; |
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@ARGS = qw( type content particle mixed empty ); |
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*FACTORY = \$XML::Schema::FACTORY; |
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# alias min() to minOccurs() and max() to maxOccurs() |
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*minOccurs = \&min; |
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*maxOccurs = \&max; |
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#------------------------------------------------------------------------ |
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# init() |
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# |
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# Called automatically by base class new() method. |
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#------------------------------------------------------------------------ |
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sub init { |
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my ($self, $config) = @_; |
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my ($type, $content, $particle, $mixed); |
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my $factory = $self->{ FACTORY } ||= $config->{ FACTORY } || $XML::Schema::FACTORY; |
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$self->TRACE("config => ", $config) if $DEBUG; |
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$self->{ type } = undef; |
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# if ($type = $config->{ type }) { |
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# # simple type content |
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# $self->{ type } = $type; |
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# $self->TRACE("set type to $type") if $DEBUG; |
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# } |
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# elsif ($particle = $config->{ particle }) { |
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if ($particle = $config->{ particle }) { |
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# particle specified directly, mixed flag also allowed |
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$self->{ particle } = $particle; |
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$self->{ mixed } = $config->{ mixed } ? 1 : 0; |
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} |
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elsif (! $config->{ empty }) { |
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if ($particle = $factory->create( particle => $config )) { |
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# have a bash at creating a particle anyway |
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$self->{ particle } = $particle; |
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} |
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else { |
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my $error = $factory->error(); |
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# HACK: this might be an empty/text only content model so |
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# we ignore particle errors that report a missing particle |
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return $self->error($error) |
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unless $error =~ /^particle expects one of:/; |
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} |
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} |
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$self->{ mixed } = $config->{ mixed } ? 1 : 0; |
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return $self; |
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} |
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sub model { |
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my $self = shift; |
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return $self->{ type } |
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|| $self->{ particle } |
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|| $self->error("no particle defined in content model"); |
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} |
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sub type { |
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return $_[0]->{ type }; |
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} |
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sub particle { |
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my $self = shift; |
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return $self->{ particle } |
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|| $self->error("no particle defined in content model"); |
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} |
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sub args { |
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return @ARGS; |
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} |
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#------------------------------------------------------------------------ |
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# mixed($flag) |
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# |
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# Used to set (if called with an argument) or get the current value |
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# for the 'mixed' flag indicating if the complexType accepts mixed |
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# content. |
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#------------------------------------------------------------------------ |
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sub mixed { |
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my $self = shift; |
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return @_ ? ($self->{ mixed } = shift) : $self->{ mixed }; |
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} |
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#------------------------------------------------------------------------ |
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# element_only($flag) |
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# |
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# The inverse of mixed(). Returns true if mixed is false and vice |
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# verse. Can also be used to update the mixed flag wih the correct |
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# truth inversion performed. |
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#------------------------------------------------------------------------ |
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sub element_only { |
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my $self = shift; |
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return @_ ? ! ($self->{ mixed } = ! shift) : ! $self->{ mixed }; |
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} |
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#------------------------------------------------------------------------ |
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# empty() |
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# |
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# Returns true if the content model is empty. |
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#------------------------------------------------------------------------ |
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sub empty { |
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return ($_[0]->{ type } || $_[0]->{ particle }) ? 0 : 1; |
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} |
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sub ID { |
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return 'Content'; |
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} |
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1; |
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