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#____________________________________________________________________
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# File: SimpleXMLDoc.pm
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#____________________________________________________________________
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#
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# Author: Shaun Ashby <Shaun.Ashby@cern.ch>
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# Update: 2005-04-22 17:09:26+0200
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# Revision: $Id: SimpleXMLDoc.pm,v 1.4 2006/01/19 17:26:29 sashby Exp $
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#
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# Copyright: 2005 (C) Shaun Ashby
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#
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#--------------------------------------------------------------------
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=head1 NAME
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ActiveDoc::SimpleXMLDoc - Base SCRAM document class.
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=head1 SYNOPSIS
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my $obj = ActiveDoc::SimpleXMLDoc->new();
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=head1 DESCRIPTION
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The ActiveDoc::SimpleXMLDoc class is the base class for all SCRAM documents. It hides all the
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machinery needed to activate full XML parsing. The XML parser used is XML::Parser::Expat.
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=head1 METHODS
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=over
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=cut
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package ActiveDoc::SimpleXMLDoc;
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use XML::Parser::Expat;
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use ActiveDoc::Container;
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require 5.004;
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use Exporter;
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@ISA=qw(Exporter);
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@EXPORT_OK=qw();
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sub new()
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{
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###############################################################
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# new #
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###############################################################
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# modified : Fri Apr 22 17:10:10 2005 / SFA #
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# params : #
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# : #
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# function : #
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# : #
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###############################################################
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my $proto=shift;
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my $class=ref($proto) || $proto;
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my $self={};
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bless $self,$class;
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my @handler_list=('Start','End','Char','Proc','Comment',
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'Entity','Element','Attlist','Doctype','DoctypeFin'); # DTD handlers
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my ($context, @userhandlers)=@_;
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$CONTAINER=new ActiveDoc::Container; # The base container;
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# Set the default handlers:
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$self->{DEFAULT_HANDLERS}={ 'Start' => \&open_, 'End' => \&close_,
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'Char' => \&char_, 'Proc' => \&proc_,
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'Comment' => \&comment_,
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'Entity' => \&entity_,
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'Element' => \&element_,
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'Attlist' => \&attlist_,
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'Doctype' => \&doctype_,
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'DoctypeFin' => \&doctypefin_ };
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# Check each supplied handler. If there's a code ref, we override the
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# default handler given in this package:
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my $i;
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for ($i = 0; $i <= $#userhandlers; $i++)
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{
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if (ref($userhandlers[$i]) eq 'CODE')
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{
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$self->{DEFAULT_HANDLERS}->{$handler_list[$i]} = $userhandlers[$i];
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}
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}
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$self->{CONTEXT}=$context;
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# Initialise the XML parser:
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$self->{xmlparser} = XML::Parser::Expat->new(ErrorContext => 3,
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ParseParamEnt => 1);
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# Add the default XML tag handlers:
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foreach my $handler (@handler_list)
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{
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$self->{xmlparser}->setHandlers($handler => $self->{DEFAULT_HANDLERS}->{$handler});
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}
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return $self;
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}
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sub parse()
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{
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my $self=shift;
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my ($filename)=@_;
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if (-f $filename)
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{
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$self->parsefile_($filename);
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# Move the data from the container to {data_} key:
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$self->data();
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}
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else
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{
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# Error: file not found
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die "SCRAM SimpleXMLDoc: File \"".$filename."\" not found! Context label = \"".$self->{CONTEXT}."\"\n";
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}
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}
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sub register_handlers_()
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{
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my $self=shift;
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# Register tags to the container class:
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if (@_)
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{
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$CONTAINER->register_handlers_(@_);
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}
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}
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sub parsefile_()
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{
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my $self=shift;
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my ($filename)=@_;
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$self->{xmlparser}->parsefile($filename)
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|| $self->{xmlparser}->xpcroak("SCRAM SimpleDoc XML parse error:");
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# Clean up:
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delete $self->{xmlparser};
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}
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sub data()
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{
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my $self=shift;
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$self->{data_} = $CONTAINER->data_();
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}
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# The default handlers:
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sub open_()
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{
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my $xmlparser=shift;
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my ($element, %attributes)=@_;
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$element=~tr[A-Z][a-z];
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# Handle document "doc" tags and load a
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# container class for the document type:
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if ($element eq 'doc')
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{
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if (exists ($attributes{'type'}))
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{
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my $doctype=$attributes{'type'}."::Container";
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eval "require $doctype";
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if ($@)
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{
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print "SCRAM SimpleXMLDoc: Unable to parse the current document because\n";
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print " the data container type (=DOCTYPE) is invalid!\n";
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print "\n";
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die $@,"\n";
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}
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# Bless the base container to its real type:
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bless($CONTAINER,$doctype);
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}
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else
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{
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die "SCRAM SimpleXMLDoc: Unable to handle a NULL document type!","\n";
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}
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return;
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}
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else
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{
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# Pass the call to the container class. This will use the AUTOLOAD
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# function of the class:
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$CONTAINER->open($element);
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$CONTAINER->$element($element,\%attributes);
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}
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}
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sub close_()
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{
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my $xmlparser=shift;
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my ($element)=@_;
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$element=~tr[A-Z][a-z];
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return if $element eq 'doc';
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# Tell the container that the tag ended:
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$CONTAINER->close($element);
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}
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sub char_()
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{
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my ($xmlparser, @items) = @_;
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my $string=join("",@items);
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return if ($string !~ /[a-zA-Z0-9_].*/);
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# Push the strings onto the container object, just in case
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# they form part of content for the active tag:
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$CONTAINER->text_($string);
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}
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sub proc_()
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{
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my ($xmlparser,$target,$data)=@_;
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}
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sub comment_()
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{
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my ($xmlparser,$string)=@_;
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}
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# Entity (Parser, Name, Val, Sysid, Pubid, Ndata,IsParam)
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sub entity_()
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{
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my ($xmlparser, $name, $val, $sysid, $pubid, $ndata)=@_;
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}
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# Element (Parser, Name, Model)
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sub element_()
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{
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my ($xmlparser,$name,$model)=@_;
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}
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# Attlist (Parser, Elname, Attname, Type, Default, Fixed)
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sub attlist_()
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{
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my ($xmlparser,$element, $attname, $type, $default,$fixed)=@_;
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}
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# Doctype (Parser, Name, Sysid, Pubid, Internal)
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sub doctype_()
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{
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my ($xmlparser,$name,$sysid,$pubid,$internal)=@_;
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}
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# DoctypeFin (Parser)
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sub doctypefin_()
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{
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my ($xmlparser)=@_;
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}
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1;
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=back
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=head1 AUTHOR/MAINTAINER
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Shaun ASHBY
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=cut
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