/[cvs]/nfo/perl/libs/XML/XUpdate/XSLT.pm
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revision 1.3 by joko, Thu May 1 20:11:49 2003 UTC revision 1.8 by joko, Fri Jun 6 04:01:52 2003 UTC
# Line 7  Line 7 
7  #    $Id$  #    $Id$
8  #  #
9  #    $Log$  #    $Log$
10    #    Revision 1.8  2003/06/06 04:01:52  joko
11    #    just write to STDERR in debug mode
12    #
13    #    Revision 1.7  2003/05/13 09:32:22  joko
14    #    minor update to pod
15    #
16    #    Revision 1.6  2003/05/07 03:11:28  joko
17    #    updated pod: new section "References", added item to "Todo" section
18    #
19    #    Revision 1.5  2003/05/06 14:24:06  joko
20    #    doesn't use Carp any more
21    #    updated pod
22    #    attempt to rewrite xml to make it more human readable using helper modules from CPAN (node indentation, etc.)
23    #
24    #    Revision 1.4  2003/05/01 23:40:32  joko
25    #    minor update: commented debugging part
26    #
27  #    Revision 1.3  2003/05/01 20:11:49  joko  #    Revision 1.3  2003/05/01 20:11:49  joko
28  #    * added pod from xupdate.pl  #    * added pod from xupdate.pl
29  #    - extracted xml to external files  #    - extracted xml to external files
# Line 22  Line 39 
39    
40  =head1 NAME  =head1 NAME
41    
42  XML::XUpdate::XSLT - A perl module for updating xml documents using XUpdate via XSLT.    XML::XUpdate::XSLT - A perl module for updating xml documents using XUpdate via XSLT.
43    
44    
45  =head3 Overview  =head3 Overview
# Line 34  XML::XUpdate::XSLT - A perl module for u Line 51  XML::XUpdate::XSLT - A perl module for u
51    xupdate - Process XUpdate commands against an XML document.    xupdate - Process XUpdate commands against an XML document.
52    
53    
54  =head3 Their implementations differ:  =head4 Their implementations differ:
55    
56      1. xupdate (by Petr Pajas) uses ...      1. xupdate (by Petr Pajas) uses ...
57      XML::XUpdate::LibXML - Simple implementation of XUpdate format      XML::XUpdate::LibXML - Simple implementation of XUpdate format
# Line 49  XML::XUpdate::XSLT - A perl module for u Line 66  XML::XUpdate::XSLT - A perl module for u
66      2. This xupdate attempts to implement the XUpdate specs using XSLT only.      2. This xupdate attempts to implement the XUpdate specs using XSLT only.
67            
68    
69  =head3 Yet another xupdate - facts in short:  =head4 Yet another xupdate - facts in short:
70    
71    S: It would be nice to have a pure perl thingy which does (almost) the same stuff....    S: It would be nice to have a pure perl thingy which does (almost) the same stuff....
72        
# Line 60  XML::XUpdate::XSLT - A perl module for u Line 77  XML::XUpdate::XSLT - A perl module for u
77        
78    Q: Can we mimic/use the interface of the - already established - 'xupdate' program???    Q: Can we mimic/use the interface of the - already established - 'xupdate' program???
79        
80    Q: Should we follow the CRUD path first? (CRUD means: Create, Retrieve, Update, Delete)    Q: Should we follow the CRUD path first?
81          (CRUD is the acronym for the datastore action primitives: Create, Retrieve, Update, Delete)
82    S?: Proposal: XML::XUpdate::XSLT::API uses XML::XUpdate::XSLT::CRUD    S?: Proposal: XML::XUpdate::XSLT::API uses XML::XUpdate::XSLT::CRUD
83    
84    
85  =head4 Todo  =head3 References
86    
87        - XUpdate:
88          Requirements: http://www.xmldb.org/xupdate/xupdate-req.html
89          Working Draft: http://www.xmldb.org/xupdate/xupdate-wd.html
90        - XML API:
91        - XML::XUpdate::LibXML: http://search.cpan.org/author/PAJAS/XML-XUpdate-LibXML-0.4.0/lib/XML/XUpdate/LibXML.pm
92        - XSL / XSLT:
93          http://www.w3.org/TR/xslt
94          http://www.xsl-rp.de/
95          http://xml.klute-thiemann.de/w3c-de/REC-xslt-20020318/
96          http://xmlxslt.sourceforge.net/
97        - misc pointers:
98          "Re: Modify XML documents": http://aspn.activestate.com/ASPN/Mail/Message/perl-xml/1265431
99          XSL Extensions: http://xmlsoft.org/XSLT/extensions.html
100          EXSLT: http://www.exslt.org/set/functions/difference/index.html
101          "how to insert element at required position in document tree?": http://p2p.wrox.com/archive/xslt/2001-06/98.asp
102          XML APIs for Databases: http://www.javaworld.com/javaworld/jw-01-2000/jw-01-dbxml.html
103    
104    
105    =head3 Todo
106    
107    o What about proper encoding? (ISO-8859-1 or UTF-8)    o What about proper encoding? (ISO-8859-1 or UTF-8)
108    o Is it possible to create the required "xsl_template.xml" at runtime via XSL itself?    o Is it possible to create the required "xsl_template.xml" at runtime via XSL itself?
109    o Cache contents of external files (*.xml). Performance!    o Cache contents of external files (*.xml). Performance!
110      o Can exception / error-code handling be improved somehow?
111          Esp.: It would be interesting, if the XUpdate payload actually could be applied, or not...
112      o Conditional processing: <xupdate:if>, etc.
113        
114    
115  =cut  =cut
# Line 81  package XML::XUpdate::XSLT; Line 122  package XML::XUpdate::XSLT;
122  use strict;  use strict;
123  use warnings;  use warnings;
124    
 use XML::XSLT 0.41;  
 use Carp;  
 use File::Basename;  
125  use Data::Dumper;  use Data::Dumper;
126    use File::Basename;
127    use XML::XSLT 0.41;
128    use XML::XUpdate::Rewrite;
129    
130  # Namespace constants  # Namespace constants
131    
# Line 153  sub process { Line 194  sub process {
194  }  }
195    
196  # First, translate the xupdate payload to xsl.  # First, translate the xupdate payload to xsl.
197  # FIXME: do DOM only!  # FIXME: do DOM only! (don't use "->toString")
198  sub _calculate {  sub _calculate {
199    my $self = shift;    my $self = shift;
200    $self->{XSLT_ENGINE_PREP} = XML::XSLT->new(    $self->{XSLT_ENGINE_PREP} = XML::XSLT->new(
# Line 170  sub _calculate { Line 211  sub _calculate {
211  # FIXME: do DOM only!  # FIXME: do DOM only!
212  sub _apply {  sub _apply {
213    my $self = shift;    my $self = shift;
214    #print $self->get_stylesheet("_worker"), "\n";    
215      # debug - print the calculated xsl on STDERR
216      print STDERR $self->get_stylesheet("_worker"), "\n" if $self->{DEBUG};
217      
218    #return;    #return;
219    $self->{XSLT_ENGINE_LIVE} = XML::XSLT->new(    $self->{XSLT_ENGINE_LIVE} = XML::XSLT->new(
220      Source => $self->get_stylesheet("_worker"),      Source => $self->get_stylesheet("_worker"),
# Line 184  sub _apply { Line 228  sub _apply {
228        
229  sub toString {  sub toString {
230    my $self = shift;    my $self = shift;
231    return $self->{XML}->{result};    
232      # use rest of argument list as hash of option values
233      my $options = {@_};
234      
235      # short circuit - just return what we have - don't modify anything
236      return $self->{XML}->{result} unless $options and $options->{rewrite};
237      
238      # Rewrite the xml document with certain engine to desired style.
239      # 'engine' defaults to "XMLParser" if not specified.
240      my $rewrite = XML::XUpdate::Rewrite->new( style => $options->{mode}, engine => $options->{using} );
241      $rewrite->set_document( $self->{XML}->{result} );
242      # TODO: Implement a configurable fallback here to return the un-rewritten payload if desired.
243      $rewrite->process() or die(__PACKAGE__ . ": Error while rewriting XML document.");
244      return $rewrite->get_document();
245  }  }
246    
247    
248  ######################################################################  ######################################################################
249  # AUXILIARY METHODS  # AUXILIARY METHODS
250    
251  # Argument parsing (with backwards compatibility hook).  # Argument list parsing.
252    # ... from XML::XUpdate::LibXML (w/o backwards compatibility hook).
253    # Could this make up a Class::AutoFill::__read_arglist which transparently
254    # makes object attributes from constructor arguments in a configurable way?
255  sub __parse_args {  sub __parse_args {
256    my $self = shift;    my $self = shift;
257    my %args;    my %args;
258    
259    if(@_ % 2 ) {    if ( @_ % 2 ) {
260      $args{dummy} = shift;      $args{dummy} = shift;
261      %args = (%args, @_);      %args = (%args, @_);
262    } else {    } else {
# Line 222  sub __slurp_file { Line 282  sub __slurp_file {
282    if (! -e $filename) {    if (! -e $filename) {
283      $filename = dirname(__FILE__) . "/$filename";      $filename = dirname(__FILE__) . "/$filename";
284      if (! -e $filename) {      if (! -e $filename) {
285        croak("File $filename does not exist.");        die("File $filename does not exist.");
286      }      }
287    }    }
288        
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