1#!/usr/local/bin/perl -w
2#
3# Copyright 1999 Clark Cooper <coopercc@netheaven.com>
4# All rights reserved.
5#
6# This program is free software; you can redistribute it and/or
7# modify it under the same terms as Perl itself.
8#
9# $Revision: 1.1.1.1 $
10#
11# $Date: 2003/07/27 11:07:11 $
12#
13#	This program take an XML document (either on standard input or
14#	from a filename supplied as an argument) and generates corresponding
15#	canonical XML document on the standard output. The definition of
16#	"Canonical XML" that I'm using is taken from the working draft
17#	published by W3C on 19-Jan-2000:
18#
19#		http://www.w3.org/TR/2000/WD-xml-c14n-20000119.html
20#
21#	The latest version of this document is at:
22#
23#		http://www.w3.org/TR/xml-c14n
24#
25
26use XML::Parser;
27
28my $indoctype = 0;
29my $inroot = 0;
30my $p = new XML::Parser(ErrorContext  => 2,
31			Namespaces    => 1,
32			ParseParamEnt => 1,
33			Handlers      => {Start => \&sthndl,
34					  End   => \&endhndl,
35					  Char  => \&chrhndl,
36					  Proc  => \&proc,
37					  Doctype => sub {$indoctype = 1},
38					  DoctypeFin => sub {$indoctype = 0}
39					 }
40			);
41
42my $file = shift;
43if (defined $file) {
44  $p->parsefile($file);
45}
46else {
47  $p->parse(*STDIN);
48}
49
50################
51## End main
52################
53
54sub sthndl {
55  my $xp = shift;
56  my $el = shift;
57
58  $inroot = 1 unless $inroot;
59  my $ns_index = 1;
60
61  my $elns = $xp->namespace($el);
62  if (defined $elns) {
63    my $pfx = 'n' . $ns_index++;
64    print "<$pfx:$el xmlns:$pfx=\"$elns\"";
65  }
66  else {
67    print "<$el";
68  }
69
70  if (@_) {
71    for (my $i = 0; $i < @_; $i += 2) {
72      my $nm = $_[$i];
73      my $ns = $xp->namespace($nm);
74      $_[$i] = defined($ns) ? "$ns\01$nm" : "\01$nm";
75    }
76
77    my %atts = @_;
78    my @ids = sort keys %atts;
79    foreach my $id (@ids) {
80      my ($ns, $nm) = split(/\01/, $id);
81      my $val = $xp->xml_escape($atts{$id}, '"', "\x9", "\xA", "\xD");
82      if (length($ns)) {
83	my $pfx = 'n' . $ns_index++;
84	print " $pfx:$nm=\"$val\" xmlns:$pfx=\"$ns\"";
85      }
86      else {
87	print " $nm=\"$val\"";
88      }
89    }
90  }
91
92  print '>';
93}  # End sthndl
94
95sub endhndl {
96  my ($xp, $el) = @_;
97
98  my $nm = $xp->namespace($el) ? "n1:$el" : $el;
99  print "</$nm>";
100  if ($xp->depth == 0) {
101    $inroot = 0;
102    print "\n";
103  }
104}  # End endhndl
105
106sub chrhndl {
107  my ($xp, $data) = @_;
108
109  print $xp->xml_escape($data, '>', "\xD");
110}  # End chrhndl
111
112sub proc {
113  my ($xp, $target, $data) = @_;
114
115  unless ($indoctype) {
116    print "<?$target $data?>";
117    print "\n" unless $inroot;
118  }
119}
120
121# Tell emacs that this is really a perl script
122#Local Variables:
123#Mode: perl
124#End:
125