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-rw-r--r--lib/XML/Stream/Parser/DTD.pm769
1 files changed, 769 insertions, 0 deletions
diff --git a/lib/XML/Stream/Parser/DTD.pm b/lib/XML/Stream/Parser/DTD.pm
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+++ b/lib/XML/Stream/Parser/DTD.pm
@@ -0,0 +1,769 @@
+##############################################################################
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Library General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Library General Public License for more details.
+#
+# You should have received a copy of the GNU Library General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+#
+# Jabber
+# Copyright (C) 1998-2004 Jabber Software Foundation http://jabber.org/
+#
+##############################################################################
+
+package XML::Stream::Parser::DTD;
+
+=head1 NAME
+
+ XML::Stream::Parser::DTD - XML DTD Parser and Verifier
+
+=head1 SYNOPSIS
+
+ This is a work in progress. I had need for a DTD parser and verifier
+ and so am working on it here. If you are reading this then you are
+ snooping. =)
+
+=head1 DESCRIPTION
+
+ This module provides the initial code for a DTD parser and verifier.
+
+=head1 METHODS
+
+=head1 EXAMPLES
+
+=head1 AUTHOR
+
+By Ryan Eatmon in February of 2001 for http://jabber.org/
+
+=head1 COPYRIGHT
+
+This module is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
+
+use strict;
+use vars qw( $VERSION );
+
+$VERSION = "1.22";
+
+sub new
+{
+ my $self = { };
+
+ bless($self);
+
+ my %args;
+ while($#_ >= 0) { $args{ lc pop(@_) } = pop(@_); }
+
+ $self->{URI} = $args{uri};
+
+ $self->{PARSING} = 0;
+ $self->{DOC} = 0;
+ $self->{XML} = "";
+ $self->{CNAME} = ();
+ $self->{CURR} = 0;
+
+ $self->{ENTITY}->{"&lt;"} = "<";
+ $self->{ENTITY}->{"&gt;"} = ">";
+ $self->{ENTITY}->{"&quot;"} = "\"";
+ $self->{ENTITY}->{"&apos;"} = "'";
+ $self->{ENTITY}->{"&amp;"} = "&";
+
+ $self->{HANDLER}->{startDocument} = sub{ $self->startDocument(@_); };
+ $self->{HANDLER}->{endDocument} = sub{ $self->endDocument(@_); };
+ $self->{HANDLER}->{startElement} = sub{ $self->startElement(@_); };
+ $self->{HANDLER}->{endElement} = sub{ $self->endElement(@_); };
+
+ $self->{STYLE} = "debug";
+
+ open(DTD,$args{uri});
+ my $dtd = join("",<DTD>);
+ close(DTD);
+
+ $self->parse($dtd);
+
+ return $self;
+}
+
+
+sub parse
+{
+ my $self = shift;
+ my $xml = shift;
+
+ while($xml =~ s/<\!--.*?-->//gs) {}
+ while($xml =~ s/\n//g) {}
+
+ $self->{XML} .= $xml;
+
+ return if ($self->{PARSING} == 1);
+
+ $self->{PARSING} = 1;
+
+ if(!$self->{DOC} == 1)
+ {
+ my $start = index($self->{XML},"<");
+
+ if (substr($self->{XML},$start,3) =~ /^<\?x$/i)
+ {
+ my $close = index($self->{XML},"?>");
+ if ($close == -1)
+ {
+ $self->{PARSING} = 0;
+ return;
+ }
+ $self->{XML} = substr($self->{XML},$close+2,length($self->{XML})-$close-2);
+ }
+
+ &{$self->{HANDLER}->{startDocument}}($self);
+ $self->{DOC} = 1;
+ }
+
+ while(1)
+ {
+
+ if (length($self->{XML}) == 0)
+ {
+ $self->{PARSING} = 0;
+ return;
+ }
+
+ my $estart = index($self->{XML},"<");
+ if ($estart == -1)
+ {
+ $self->{PARSING} = 0;
+ return;
+ }
+
+ my $close = index($self->{XML},">");
+ my $dtddata = substr($self->{XML},$estart+1,$close-1);
+ my $nextspace = index($dtddata," ");
+ my $attribs;
+
+ my $type = substr($dtddata,0,$nextspace);
+ $dtddata = substr($dtddata,$nextspace+1,length($dtddata)-$nextspace-1);
+ $nextspace = index($dtddata," ");
+
+ if ($type eq "!ENTITY")
+ {
+ $self->entity($type,$dtddata);
+ }
+ else
+ {
+ my $tag = substr($dtddata,0,$nextspace);
+ $dtddata = substr($dtddata,$nextspace+1,length($dtddata)-$nextspace-1);
+ $nextspace = index($dtddata," ");
+
+ $self->element($type,$tag,$dtddata) if ($type eq "!ELEMENT");
+ $self->attlist($type,$tag,$dtddata) if ($type eq "!ATTLIST");
+ }
+
+ $self->{XML} = substr($self->{XML},$close+1,length($self->{XML})-$close-1);
+ next;
+ }
+}
+
+
+sub startDocument
+{
+ my $self = shift;
+}
+
+
+sub endDocument
+{
+ my $self = shift;
+}
+
+
+sub entity
+{
+ my $self = shift;
+ my ($type, $data) = @_;
+
+ foreach my $entity (keys(%{$self->{ENTITY}}))
+ {
+ $data =~ s/$entity/$self->{ENTITY}->{$entity}/g;
+ }
+
+ my ($symbol,$tag,undef,$string) = ($data =~ /^\s*(\S+)\s+(\S+)\s+(\"|\')([^\3]*)\3\s*$/);
+ $self->{ENTITY}->{"${symbol}${tag}\;"} = $string;
+}
+
+sub element
+{
+ my $self = shift;
+ my ($type, $tag, $data) = @_;
+
+ foreach my $entity (keys(%{$self->{ENTITY}}))
+ {
+ $data =~ s/$entity/$self->{ENTITY}->{$entity}/g;
+ }
+
+ $self->{COUNTER}->{$tag} = 0 unless exists($self->{COUNTER}->{$tag});
+
+ $self->parsegrouping($tag,\$self->{ELEMENT}->{$tag},$data);
+ $self->flattendata(\$self->{ELEMENT}->{$tag});
+
+}
+
+
+sub flattendata
+{
+ my $self = shift;
+ my $dstr = shift;
+
+ if ($$dstr->{type} eq "list")
+ {
+ foreach my $index (0..$#{$$dstr->{list}})
+ {
+ $self->flattendata(\$$dstr->{list}->[$index]);
+ }
+
+ if (!exists($$dstr->{repeat}) && ($#{$$dstr->{list}} == 0))
+ {
+ $$dstr = $$dstr->{list}->[0];
+ }
+ }
+}
+
+sub parsegrouping
+{
+ my $self = shift;
+ my ($tag,$dstr,$data) = @_;
+
+ $data =~ s/^\s*//;
+ $data =~ s/\s*$//;
+
+ if ($data =~ /[\*\+\?]$/)
+ {
+ ($$dstr->{repeat}) = ($data =~ /(.)$/);
+ $data =~ s/.$//;
+ }
+
+ if ($data =~ /^\(.*\)$/)
+ {
+ my ($seperator) = ($data =~ /^\(\s*\S+\s*(\,|\|)/);
+ $$dstr->{ordered} = "yes" if ($seperator eq ",");
+ $$dstr->{ordered} = "no" if ($seperator eq "|");
+
+ my $count = 0;
+ $$dstr->{type} = "list";
+ foreach my $grouping ($self->groupinglist($data,$seperator))
+ {
+ $self->parsegrouping($tag,\$$dstr->{list}->[$count],$grouping);
+ $count++;
+ }
+ }
+ else
+ {
+ $$dstr->{type} = "element";
+ $$dstr->{element} = $data;
+ $self->{COUNTER}->{$data} = 0 unless exists($self->{COUNTER}->{$data});
+ $self->{COUNTER}->{$data}++;
+ $self->{CHILDREN}->{$tag}->{$data} = 1;
+ }
+}
+
+
+sub attlist
+{
+ my $self = shift;
+ my ($type, $tag, $data) = @_;
+
+ foreach my $entity (keys(%{$self->{ENTITY}}))
+ {
+ $data =~ s/$entity/$self->{ENTITY}->{$entity}/g;
+ }
+
+ while($data ne "")
+ {
+ my ($att) = ($data =~ /^\s*(\S+)/);
+ $data =~ s/^\s*\S+\s*//;
+
+ my $value;
+ if ($data =~ /^\(/)
+ {
+ $value = $self->getgrouping($data);
+ $data = substr($data,length($value)+1,length($data));
+ $data =~ s/^\s*//;
+ $self->{ATTLIST}->{$tag}->{$att}->{type} = "list";
+ foreach my $val (split(/\s*\|\s*/,substr($value,1,length($value)-2))) {
+$self->{ATTLIST}->{$tag}->{$att}->{value}->{$val} = 1;
+ }
+ }
+ else
+ {
+ ($value) = ($data =~ /^(\S+)/);
+ $data =~ s/^\S+\s*//;
+ $self->{ATTLIST}->{$tag}->{$att}->{type} = $value;
+ }
+
+ my $default;
+ if ($data =~ /^\"|^\'/)
+ {
+ my($sq,$val) = ($data =~ /^(\"|\')([^\"\']*)\1/);
+ $default = $val;
+ $data =~ s/^$sq$val$sq\s*//;
+ }
+ else
+ {
+ ($default) = ($data =~ /^(\S+)/);
+ $data =~ s/^\S+\s*//;
+ }
+
+ $self->{ATTLIST}->{$tag}->{$att}->{default} = $default;
+ }
+}
+
+
+
+sub getgrouping
+{
+ my $self = shift;
+ my ($data) = @_;
+
+ my $count = 0;
+ my $parens = 0;
+ foreach my $char (split("",$data))
+ {
+ $parens++ if ($char eq "(");
+ $parens-- if ($char eq ")");
+ $count++;
+ last if ($parens == 0);
+ }
+ return substr($data,0,$count);
+}
+
+
+sub groupinglist
+{
+ my $self = shift;
+ my ($grouping,$seperator) = @_;
+
+ my @list;
+ my $item = "";
+ my $parens = 0;
+ my $word = "";
+ $grouping = substr($grouping,1,length($grouping)-2) if ($grouping =~ /^\(/);
+ foreach my $char (split("",$grouping))
+ {
+ $parens++ if ($char eq "(");
+ $parens-- if ($char eq ")");
+ if (($parens == 0) && ($char eq $seperator))
+ {
+ push(@list,$word);
+ $word = "";
+ }
+ else
+ {
+ $word .= $char;
+ }
+ }
+ push(@list,$word) unless ($word eq "");
+ return @list;
+}
+
+
+sub root
+{
+ my $self = shift;
+ my $tag = shift;
+ my @root;
+ foreach my $tag (keys(%{$self->{COUNTER}}))
+ {
+ push(@root,$tag) if ($self->{COUNTER}->{$tag} == 0);
+ }
+
+ print "ERROR: Too many root tags... Check the DTD...\n"
+ if ($#root > 0);
+ return $root[0];
+}
+
+
+sub children
+{
+ my $self = shift;
+ my ($tag,$tree) = @_;
+
+ return unless exists ($self->{CHILDREN}->{$tag});
+ return if (exists($self->{CHILDREN}->{$tag}->{EMPTY}));
+ if (defined($tree))
+ {
+ my @current;
+ foreach my $current (&XML::Stream::GetXMLData("tree array",$tree,"*","",""))
+ {
+ push(@current,$$current[0]);
+ }
+ return $self->allowedchildren($self->{ELEMENT}->{$tag},\@current);
+ }
+ return $self->allowedchildren($self->{ELEMENT}->{$tag});
+}
+
+
+sub allowedchildren
+{
+ my $self = shift;
+ my ($dstr,$current) = @_;
+
+ my @allowed;
+
+ if ($dstr->{type} eq "element")
+ {
+ my $test = (defined($current) && $#{@{$current}} > -1) ? $$current[0] : "";
+ shift(@{$current}) if ($dstr->{element} eq $test);
+ if ($self->repeatcheck($dstr,$test) == 1)
+ {
+ return $dstr->{element};
+ }
+ }
+ else
+ {
+ foreach my $index (0..$#{$dstr->{list}})
+ {
+ push(@allowed,$self->allowedchildren($dstr->{list}->[$index],$current));
+ }
+ }
+
+ return @allowed;
+}
+
+
+sub repeatcheck
+{
+ my $self = shift;
+ my ($dstr,$tag) = @_;
+
+ $dstr = $self->{ELEMENT}->{$dstr} if exists($self->{ELEMENT}->{$dstr});
+
+# print "repeatcheck: tag($tag)\n";
+# print "repeatcheck: repeat($dstr->{repeat})\n"
+# if exists($dstr->{repeat});
+
+ my $return = 0;
+ $return = ((!defined($tag) ||
+ ($tag eq $dstr->{element})) ?
+ 0 :
+ 1)
+ if (!exists($dstr->{repeat}) ||
+ ($dstr->{repeat} eq "?"));
+ $return = ((defined($tag) ||
+ (exists($dstr->{ordered}) &&
+ ($dstr->{ordered} eq "yes"))) ?
+ 1 :
+ 0)
+ if (exists($dstr->{repeat}) &&
+ (($dstr->{repeat} eq "+") ||
+ ($dstr->{repeat} eq "*")));
+
+# print "repeatcheck: return($return)\n";
+ return $return;
+}
+
+
+sub required
+{
+ my $self = shift;
+ my ($dstr,$tag,$count) = @_;
+
+ $dstr = $self->{ELEMENT}->{$dstr} if exists($self->{ELEMENT}->{$dstr});
+
+ if ($dstr->{type} eq "element")
+ {
+ return 0 if ($dstr->{element} ne $tag);
+ return 1 if !exists($dstr->{repeat});
+ return 1 if (($dstr->{repeat} eq "+") && ($count == 1)) ;
+ }
+ else
+ {
+ return 0 if (($dstr->{repeat} eq "*") || ($dstr->{repeat} eq "?"));
+ my $test = 0;
+ foreach my $index (0..$#{$dstr->{list}})
+ {
+ $test = $test | $self->required($dstr->{list}->[$index],$tag,$count);
+ }
+ return $test;
+ }
+ return 0;
+}
+
+
+sub addchild
+{
+ my $self = shift;
+ my ($tag,$child,$tree) = @_;
+
+# print "addchild: tag($tag) child($child)\n";
+
+ my @current;
+ if (defined($tree))
+ {
+# &Net::Jabber::printData("\$tree",$tree);
+
+ @current = &XML::Stream::GetXMLData("index array",$tree,"*","","");
+
+# &Net::Jabber::printData("\$current",\@current);
+ }
+
+ my @newBranch = $self->addchildrecurse($self->{ELEMENT}->{$tag},$child,\@current);
+
+ return $tree unless ("@newBranch" ne "");
+
+# &Net::Jabber::printData("\$newBranch",\@newBranch);
+
+ my $location = shift(@newBranch);
+
+ if ($location eq "end")
+ {
+ splice(@{$$tree[1]},@{$$tree[1]},0,@newBranch);
+ }
+ else
+ {
+ splice(@{$$tree[1]},$location,0,@newBranch);
+ }
+ return $tree;
+}
+
+
+sub addcdata
+{
+ my $self = shift;
+ my ($tag,$child,$tree) = @_;
+
+# print "addchild: tag($tag) child($child)\n";
+
+ my @current;
+ if (defined($tree))
+ {
+# &Net::Jabber::printData("\$tree",$tree);
+
+ @current = &XML::Stream::GetXMLData("index array",$tree,"*","","");
+
+# &Net::Jabber::printData("\$current",\@current);
+ }
+
+ my @newBranch = $self->addchildrecurse($self->{ELEMENT}->{$tag},$child,\@current);
+
+ return $tree unless ("@newBranch" ne "");
+
+# &Net::Jabber::printData("\$newBranch",\@newBranch);
+
+ my $location = shift(@newBranch);
+
+ if ($location eq "end")
+ {
+ splice(@{$$tree[1]},@{$$tree[1]},0,@newBranch);
+ }
+ else
+ {
+ splice(@{$$tree[1]},$location,0,@newBranch);
+ }
+ return $tree;
+}
+
+
+sub addchildrecurse
+{
+ my $self = shift;
+ my ($dstr,$child,$current) = @_;
+
+# print "addchildrecurse: child($child) type($dstr->{type})\n";
+
+ if ($dstr->{type} eq "element")
+ {
+# print "addchildrecurse: tag($dstr->{element})\n";
+ my $count = 0;
+ while(($#{@{$current}} > -1) && ($dstr->{element} eq $$current[0]))
+ {
+ shift(@{$current});
+ shift(@{$current});
+ $count++;
+ }
+ if (($dstr->{element} eq $child) &&
+ ($self->repeatcheck($dstr,(($count > 0) ? $child : "")) == 1))
+ {
+ my @return = ( "end" , $self->newbranch($child));
+ @return = ($$current[1], $self->newbranch($child))
+ if ($#{@{$current}} > -1);
+# print "addchildrecurse: Found the spot! (",join(",",@return),")\n";
+
+ return @return;
+ }
+ }
+ else
+ {
+ foreach my $index (0..$#{$dstr->{list}})
+ {
+ my @newBranch = $self->addchildrecurse($dstr->{list}->[$index],$child,$current);
+ return @newBranch if ("@newBranch" ne "");
+ }
+ }
+# print "Let's blow....\n";
+ return;
+}
+
+
+sub deletechild
+{
+ my $self = shift;
+ my ($tag,$parent,$parenttree,$tree) = @_;
+
+ return $tree unless exists($self->{ELEMENT}->{$tag});
+ return $tree if $self->required($parent,$tag,&XML::Stream::GetXMLData("count",$parenttree,$tag));
+
+ return [];
+}
+
+
+
+sub newbranch
+{
+ my $self = shift;
+ my $tag = shift;
+
+ $tag = $self->root() unless defined($tag);
+
+ my @tree = ();
+
+ return ("0","") if ($tag eq "#PCDATA");
+
+ push(@tree,$tag);
+ push(@tree,[ {} ]);
+
+ foreach my $att ($self->attribs($tag))
+ {
+ $tree[1]->[0]->{$att} = ""
+ if (($self->{ATTLIST}->{$tag}->{$att}->{default} eq "#REQUIRED") &&
+ ($self->{ATTLIST}->{$tag}->{$att}->{type} eq "CDATA"));
+ }
+
+ push(@{$tree[1]},$self->recursebranch($self->{ELEMENT}->{$tag}));
+ return @tree;
+}
+
+
+sub recursebranch
+{
+ my $self = shift;
+ my $dstr = shift;
+
+ my @tree;
+ if (($dstr->{type} eq "element") &&
+ ($dstr->{element} ne "EMPTY"))
+ {
+ @tree = $self->newbranch($dstr->{element})
+ if (!exists($dstr->{repeat}) ||
+ ($dstr->{repeat} eq "+"));
+ }
+ else
+ {
+ foreach my $index (0..$#{$dstr->{list}})
+ {
+ push(@tree,$self->recursebranch($dstr->{list}->[$index]))
+if (!exists($dstr->{repeat}) ||
+ ($dstr->{repeat} eq "+"));
+ }
+ }
+ return @tree;
+}
+
+
+sub attribs
+{
+ my $self = shift;
+ my ($tag,$tree) = @_;
+
+ return unless exists ($self->{ATTLIST}->{$tag});
+
+ if (defined($tree))
+ {
+ my %current = &XML::Stream::GetXMLData("attribs",$tree,"","","");
+ return $self->allowedattribs($tag,\%current);
+ }
+ return $self->allowedattribs($tag);
+}
+
+
+sub allowedattribs
+{
+ my $self = shift;
+ my ($tag,$current) = @_;
+
+ my %allowed;
+ foreach my $att (keys(%{$self->{ATTLIST}->{$tag}}))
+ {
+ $allowed{$att} = 1 unless (defined($current) &&
+ exists($current->{$att}));
+ }
+ return sort {$a cmp $b} keys(%allowed);
+}
+
+
+sub attribvalue
+{
+ my $self = shift;
+ my $tag = shift;
+ my $att = shift;
+
+ return $self->{ATTLIST}->{$tag}->{$att}->{type}
+ if ($self->{ATTLIST}->{$tag}->{$att}->{type} ne "list");
+ return sort {$a cmp $b} keys(%{$self->{ATTLIST}->{$tag}->{$att}->{value}});
+}
+
+
+sub addattrib
+{
+ my $self = shift;
+ my ($tag,$att,$tree) = @_;
+
+ return $tree unless exists($self->{ATTLIST}->{$tag});
+ return $tree unless exists($self->{ATTLIST}->{$tag}->{$att});
+
+ my $default = $self->{ATTLIST}->{$tag}->{$att}->{default};
+ $default = "" if ($default eq "#REQUIRED");
+ $default = "" if ($default eq "#IMPLIED");
+
+ $$tree[1]->[0]->{$att} = $default;
+
+ return $tree;
+}
+
+
+sub attribrequired
+{
+ my $self = shift;
+ my ($tag,$att) = @_;
+
+ return 0 unless exists($self->{ATTLIST}->{$tag});
+ return 0 unless exists($self->{ATTLIST}->{$tag}->{$att});
+
+ return 1 if ($self->{ATTLIST}->{$tag}->{$att}->{default} eq "#REQUIRED");
+ return 0;
+}
+
+
+sub deleteattrib
+{
+ my $self = shift;
+ my ($tag,$att,$tree) = @_;
+
+ return $tree unless exists($self->{ATTLIST}->{$tag});
+ return $tree unless exists($self->{ATTLIST}->{$tag}->{$att});
+
+ return if $self->attribrequired($tag,$att);
+
+ delete($$tree[1]->[0]->{$att});
+
+ return $tree;
+}
+
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