/[cvs]/nfo/perl/libs/XML/XUpdate/XSLT.pm
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revision 1.4 by joko, Thu May 1 23:40:32 2003 UTC revision 1.6 by joko, Wed May 7 03:11:28 2003 UTC
# Line 7  Line 7 
7  #    $Id$  #    $Id$
8  #  #
9  #    $Log$  #    $Log$
10    #    Revision 1.6  2003/05/07 03:11:28  joko
11    #    updated pod: new section "References", added item to "Todo" section
12    #
13    #    Revision 1.5  2003/05/06 14:24:06  joko
14    #    doesn't use Carp any more
15    #    updated pod
16    #    attempt to rewrite xml to make it more human readable using helper modules from CPAN (node indentation, etc.)
17    #
18  #    Revision 1.4  2003/05/01 23:40:32  joko  #    Revision 1.4  2003/05/01 23:40:32  joko
19  #    minor update: commented debugging part  #    minor update: commented debugging part
20  #  #
# Line 25  Line 33 
33    
34  =head1 NAME  =head1 NAME
35    
36  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.
37    
38    
39  =head3 Overview  =head3 Overview
# Line 37  XML::XUpdate::XSLT - A perl module for u Line 45  XML::XUpdate::XSLT - A perl module for u
45    xupdate - Process XUpdate commands against an XML document.    xupdate - Process XUpdate commands against an XML document.
46    
47    
48  =head3 Their implementations differ:  =head4 Their implementations differ:
49    
50      1. xupdate (by Petr Pajas) uses ...      1. xupdate (by Petr Pajas) uses ...
51      XML::XUpdate::LibXML - Simple implementation of XUpdate format      XML::XUpdate::LibXML - Simple implementation of XUpdate format
# Line 52  XML::XUpdate::XSLT - A perl module for u Line 60  XML::XUpdate::XSLT - A perl module for u
60      2. This xupdate attempts to implement the XUpdate specs using XSLT only.      2. This xupdate attempts to implement the XUpdate specs using XSLT only.
61            
62    
63  =head3 Yet another xupdate - facts in short:  =head4 Yet another xupdate - facts in short:
64    
65    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....
66        
# Line 63  XML::XUpdate::XSLT - A perl module for u Line 71  XML::XUpdate::XSLT - A perl module for u
71        
72    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???
73        
74    Q: Should we follow the CRUD path first? (CRUD means: Create, Retrieve, Update, Delete)    Q: Should we follow the CRUD path first?
75          (CRUD is the acronym for the datastore action primitives: Create, Retrieve, Update, Delete)
76    S?: Proposal: XML::XUpdate::XSLT::API uses XML::XUpdate::XSLT::CRUD    S?: Proposal: XML::XUpdate::XSLT::API uses XML::XUpdate::XSLT::CRUD
77    
78    
79  =head4 Todo  =head3 References
80    
81        - XUpdate:
82          Requirements: http://www.xmldb.org/xupdate/xupdate-req.html
83          Working Draft: http://www.xmldb.org/xupdate/xupdate-wd.html
84        - XML API:
85        - XML::XUpdate::LibXML: http://search.cpan.org/author/PAJAS/XML-XUpdate-LibXML-0.4.0/lib/XML/XUpdate/LibXML.pm
86        - XSL / XSLT:
87          http://www.w3.org/TR/xslt
88          http://www.xsl-rp.de/
89          http://xml.klute-thiemann.de/w3c-de/REC-xslt-20020318/
90          http://xmlxslt.sourceforge.net/
91        - misc pointers:
92          "Re: Modify XML documents": http://aspn.activestate.com/ASPN/Mail/Message/perl-xml/1265431
93          XSL Extensions: http://xmlsoft.org/XSLT/extensions.html
94          EXSLT: http://www.exslt.org/set/functions/difference/index.html
95          "how to insert element at required position in document tree?": http://p2p.wrox.com/archive/xslt/2001-06/98.asp
96          XML APIs for Databases: http://www.javaworld.com/javaworld/jw-01-2000/jw-01-dbxml.html
97    
98    
99    =head3 Todo
100    
101    o What about proper encoding? (ISO-8859-1 or UTF-8)    o What about proper encoding? (ISO-8859-1 or UTF-8)
102    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?
103    o Cache contents of external files (*.xml). Performance!    o Cache contents of external files (*.xml). Performance!
104      o Can exception / error-code handling be improved somehow?
105          Esp.: It would be interesting, if the XUpdate payload actually could be applied, or not...
106      o <xupdate:if>, etc.
107        
108    
109  =cut  =cut
# Line 84  package XML::XUpdate::XSLT; Line 116  package XML::XUpdate::XSLT;
116  use strict;  use strict;
117  use warnings;  use warnings;
118    
 use XML::XSLT 0.41;  
 use Carp;  
 use File::Basename;  
119  use Data::Dumper;  use Data::Dumper;
120    use File::Basename;
121    use XML::XSLT 0.41;
122    use XML::XUpdate::Rewrite;
123    
124  # Namespace constants  # Namespace constants
125    
# Line 156  sub process { Line 188  sub process {
188  }  }
189    
190  # First, translate the xupdate payload to xsl.  # First, translate the xupdate payload to xsl.
191  # FIXME: do DOM only!  # FIXME: do DOM only! (don't use "->toString")
192  sub _calculate {  sub _calculate {
193    my $self = shift;    my $self = shift;
194    $self->{XSLT_ENGINE_PREP} = XML::XSLT->new(    $self->{XSLT_ENGINE_PREP} = XML::XSLT->new(
# Line 175  sub _apply { Line 207  sub _apply {
207    my $self = shift;    my $self = shift;
208        
209    # debug - print the calculated xsl on STDERR    # debug - print the calculated xsl on STDERR
210    #print STDERR $self->get_stylesheet("_worker"), "\n";    print STDERR $self->get_stylesheet("_worker"), "\n";
211        
212    #return;    #return;
213    $self->{XSLT_ENGINE_LIVE} = XML::XSLT->new(    $self->{XSLT_ENGINE_LIVE} = XML::XSLT->new(
# Line 190  sub _apply { Line 222  sub _apply {
222        
223  sub toString {  sub toString {
224    my $self = shift;    my $self = shift;
225    return $self->{XML}->{result};    
226      # use rest of argument list as hash of option values
227      my $options = {@_};
228      
229      # short circuit - just return what we have - don't modify anything
230      return $self->{XML}->{result} unless $options and $options->{rewrite};
231      
232      # Rewrite the xml document with certain engine to desired style.
233      # 'engine' defaults to "XMLParser" if not specified.
234      my $rewrite = XML::XUpdate::Rewrite->new( style => $options->{mode}, engine => $options->{using} );
235      $rewrite->set_document( $self->{XML}->{result} );
236      # TODO: Implement a configurable fallback here to return the un-rewritten payload if desired.
237      $rewrite->process() or die(__PACKAGE__ . ": Error while rewriting XML document.");
238      return $rewrite->get_document();
239  }  }
240    
241    
242  ######################################################################  ######################################################################
243  # AUXILIARY METHODS  # AUXILIARY METHODS
244    
245  # Argument parsing (with backwards compatibility hook).  # Argument list parsing.
246    # ... from XML::XUpdate::LibXML (w/o backwards compatibility hook).
247    # Could this make up a Class::AutoFill::__read_arglist which transparently
248    # makes object attributes from constructor arguments in a configurable way?
249  sub __parse_args {  sub __parse_args {
250    my $self = shift;    my $self = shift;
251    my %args;    my %args;
252    
253    if(@_ % 2 ) {    if ( @_ % 2 ) {
254      $args{dummy} = shift;      $args{dummy} = shift;
255      %args = (%args, @_);      %args = (%args, @_);
256    } else {    } else {
# Line 228  sub __slurp_file { Line 276  sub __slurp_file {
276    if (! -e $filename) {    if (! -e $filename) {
277      $filename = dirname(__FILE__) . "/$filename";      $filename = dirname(__FILE__) . "/$filename";
278      if (! -e $filename) {      if (! -e $filename) {
279        croak("File $filename does not exist.");        die("File $filename does not exist.");
280      }      }
281    }    }
282        
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