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#============================================================= -*-perl-*- |
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# XML::Schema::Particle::Sequence.pm |
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# DESCRIPTION |
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# Subclassed particle to contain a sequence of other particles |
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# which should be matched in order. |
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# |
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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: Sequence.pm,v 1.1.1.1 2001/08/29 14:30:17 abw Exp $ |
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# |
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#======================================================================== |
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package XML::Schema::Particle::Sequence; |
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use strict; |
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use base qw( XML::Schema::Particle ); |
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use vars qw( $VERSION $DEBUG $ERROR $ETYPE ); |
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$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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$ETYPE = 'SequenceParticle'; |
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#*DEBUG = \$XML::Schema::Particle::DEBUG; |
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#*ERROR = \$XML::Schema::Particle::ERROR; |
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#*DECLINED = \&XML::Schema::Particle::DECLINED; |
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#------------------------------------------------------------------------ |
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# init() |
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# |
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# Called automatically by base class new() method. |
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#------------------------------------------------------------------------ |
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sub init { |
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my ($self, $config) = @_; |
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$self->TRACE("config => ", $config) if $DEBUG; |
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my $sequence = $config->{ sequence } |
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|| return $self->error("no sequence defined"); |
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return $self->error("sequence expects an array ref") |
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unless ref $sequence eq 'ARRAY'; |
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my ($p, @particles); |
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my $factory = $self->{ _FACTORY } = $config->{ FACTORY } |
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|| $XML::Schema::FACTORY; |
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foreach $p (@$sequence) { |
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my $particle = $factory->create( particle => $p ); |
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100
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unless (defined $particle) { |
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return $self->error("error in sequence item ", scalar @particles, |
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': ', $factory->error()); |
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} |
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push(@particles, $particle); |
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} |
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$self->{ particles } = \@particles; |
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$self->{ type } = 'sequence'; |
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$self->constrain($config) |
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|| return; |
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return $self; |
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} |
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sub particles { |
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my $self = shift; |
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return $self->{ particles } |
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|| $self->error("empty particle sequence"); |
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} |
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sub start { |
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my $self = shift; |
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$self->TRACE() if $DEBUG; |
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$self->{ occurs } = 0; |
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$self->_start_sequence(); |
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} |
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sub _start_sequence { |
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my $self = shift; |
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$self->TRACE() if $DEBUG; |
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my $particles = $self->{ particles } |
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|| return $self->decline("empty particle sequence"); |
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$self->{ _PSET } = [ @$particles ]; |
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my $first = $particles->[0]; |
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return $first->start() |
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|| $self->error($first->error()); |
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} |
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sub end { |
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my $self = shift; |
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my ($min, $max, $occurs, $name) = @$self{ qw( min max occurs name ) }; |
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$self->TRACE() if $DEBUG; |
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0
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my $pset = $self->{ _PSET }; |
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0
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if (@$pset) { |
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my $pnow = shift @$pset; |
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while ($pnow) { |
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$self->TRACE("clearing ", $pnow->ID); |
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$pnow->end() |
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|| return $self->error($pnow->error()); |
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if ($pnow = shift(@$pset)) { |
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$pnow->start() |
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|| return $self->error($pnow->error()); |
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} |
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} |
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$occurs++; |
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} |
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0
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return $self->error("minimum of $min $name element", |
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$min > 1 ? 's' : '', " expected") |
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if $occurs < $min; |
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0
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return $self->error("maximum of $max $name element", |
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$max > 1 ? 's' : '', " exceeded") |
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if $occurs > $max; |
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0
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return 1; |
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} |
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148
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sub element { |
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0
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0
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0
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my ($self, $name) = @_; |
150
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0
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my $pset = $self->{ _PSET }; |
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0
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0
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my $pnow = @$pset ? $pset->[0] : undef; |
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my ($min, $max) = @$self{ qw( min max ) }; |
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0
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my $element; |
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0
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my $restarted = 0; |
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0
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my $satisfied = 0; |
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157
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0
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$self->TRACE("name => ", $name) if $DEBUG; |
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0
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while ($pnow) { |
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# true value returned indicates success |
161
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0
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return $element |
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if ($element = $pnow->element($name)); |
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164
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# undefined value returned indicates error |
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0
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unless (defined $element) { |
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0
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$self->TRACE('DECLINED'); |
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0
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0
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return $satisfied ? $self->decline("unexpected <$name> element") |
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: $self->error($pnow->error()) |
169
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} |
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# defined but false value (0) indicates particle |
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# declined to accept element but was otherwise |
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# satisfied according to min/max constraints so |
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# we move on to try the next particle |
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0
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$self->TRACE("ending $pnow because it declined"); |
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0
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$pnow->end() |
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|| return $self->error($pnow->error()); |
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179
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0
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shift(@$pset); |
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181
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0
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0
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if (@$pset) { |
182
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0
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$pnow = $pset->[0]; |
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0
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$pnow->start() || return $self->error($pnow->error()); |
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} |
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else { |
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# looks like we reached the end of the sequence... |
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0
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my $occurs = ++$self->{ occurs }; |
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189
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# if we've reached our max occurences then we must decline |
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0
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0
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return $self->decline("unexpected <$name> element (max. $max sequences reached)") |
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if $occurs >= $max; |
192
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193
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# and if we've already restarted once then we shouldn't again |
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0
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0
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last if $restarted; |
195
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196
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# otherwise restart the sequence |
197
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0
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0
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return unless $self->_start_sequence(); |
198
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0
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$pset = $self->{ _PSET }; |
199
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0
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0
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$pnow = @$pset ? $pset->[0] : undef; |
200
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201
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0
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$restarted++; |
202
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0
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0
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$satisfied++ if $occurs >= $min; |
203
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} |
204
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} |
205
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206
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0
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0
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return $satisfied ? $self->decline("unexpected <$name> element") |
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: $self->error("unexpected <$name> element"); |
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209
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} |
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211
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212
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213
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1; |
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215
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216
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217
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219
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