/[cvs]/nfo/perl/libs/Data/Mungle/Transform/Deep.pm
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revision 1.1 by joko, Fri Nov 29 04:49:20 2002 UTC revision 1.17 by joko, Thu Mar 27 15:17:07 2003 UTC
# Line 1  Line 1 
1  ##############################################  ## ---------------------------------------------------------------------------
2  #  ##  $Id$
3  #  $Id$  ## ---------------------------------------------------------------------------
4  #  ##  $Log$
5  #  $Log$  ##  Revision 1.17  2003/03/27 15:17:07  joko
6  #  Revision 1.1  2002/11/29 04:49:20  joko  ##  namespace fixes for Data::Mungle::*
7  #  + initial check-in  ##
8  #  ##  Revision 1.16  2003/03/27 15:04:52  joko
9  #  Revision 1.1  2002/10/10 03:26:00  cvsjoko  ##  minor update: comment
10  #  + new  ##
11  #  ##  Revision 1.15  2003/02/27 14:39:48  jonen
12  ##############################################  ##  + fixed bug at _hash2object()
13    ##
14    ##  Revision 1.14  2003/02/22 17:13:55  jonen
15    ##  + added function 'childObject2string()' to encode 'child'-references to option related string
16    ##  + use new option at 'expand()' for replacing 'childObject2string'
17    ##
18    ##  Revision 1.13  2003/02/21 01:48:50  joko
19    ##  renamed core function
20    ##
21    ##  Revision 1.12  2003/02/20 22:45:19  joko
22    ##  fix regarding new deep_copy
23    ##
24    ##  Revision 1.11  2003/02/20 21:13:54  joko
25    ##  - removed implementation of deep_copy2 - get this from the Pitonyak namespace (now cloned to repository)
26    ##
27    ##  Revision 1.10  2003/02/20 20:48:00  joko
28    ##  - refactored lots of code to Data::Code::Ref
29    ##  + alternative 'deep_copy' implementation
30    ##
31    ##  Revision 1.9  2003/02/18 19:35:56  joko
32    ##  +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
33    ##
34    ##  Revision 1.8  2003/02/09 05:10:56  joko
35    ##  + minor update
36    ##
37    ##  Revision 1.7  2003/01/19 03:26:59  joko
38    ##  + added 'sub deep_copy'  -  refactored from libp
39    ##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'
40    ##
41    ##  Revision 1.6  2002/12/23 11:27:53  jonen
42    ##  + changed behavior WATCH!
43    ##
44    ##  Revision 1.5  2002/12/16 19:57:54  joko
45    ##  + option 'init'
46    ##
47    ##  Revision 1.4  2002/12/05 13:56:49  joko
48    ##  - var_deref
49    ##  + expand - more sophisticated dereferencing with callbacks using Iterate
50    ##
51    ##  Revision 1.3  2002/12/03 05:34:55  joko
52    ##  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
53    ##
54    ##  Revision 1.2  2002/12/01 04:44:07  joko
55    ##  + code from Data::Transform::OO
56    ##
57    ##  Revision 1.1  2002/11/29 04:49:20  joko
58    ##  + initial check-in
59    ##
60    ##  Revision 1.1  2002/10/10 03:26:00  cvsjoko
61    ##  + new
62    ## ---------------------------------------------------------------------------
63    
64    
65  package Data::Transform::Deep;  package Data::Mungle::Transform::Deep;
66    
67  use strict;  use strict;
68  use warnings;  use warnings;
69    
70  require Exporter;  require Exporter;
71  our @ISA = qw( Exporter );  our @ISA = qw( Exporter );
72  our @EXPORT_OK = qw(  our @EXPORT_OK = qw(
73    &var_NumericalHashToArray    &expand
74    &var_deref    &deep_copy
75    &var_mixin    &merge_to
   &getStructSlotByStringyAddress  
76  );  );
77    
78    
79  use attributes;  use attributes;
80    use Data::Dumper;
81    use Iterate;
82    
83    use Pitonyak::DeepCopy;
84    use Data::Mungle::Transform::Encode qw( latin_to_utf8 latin_to_utf8_scalar utf8_to_latin utf8_to_latin_scalar );
85    use Data::Mungle::Code::Ref qw( ref_slot );
86    
87  sub var_NumericalHashToArray {  sub numhash2list {
88    my $vref = shift;    my $vref = shift;
89    #my $context = shift;    #my $context = shift;
90    if (ref $vref eq 'HASH') {    if (ref $vref eq 'HASH') {
# Line 45  sub var_NumericalHashToArray { Line 100  sub var_NumericalHashToArray {
100                }                }
101                $vref->{$_} = \@arr;                $vref->{$_} = \@arr;
102              }              }
103              var_NumericalHashToArray($vref->{$_});              numhash2list($vref->{$_});
104            }            }
105  #      } else {  #      } else {
106  #        #$vref->{$_} = scalar2iso($vref->{$_});  #        #$vref->{$_} = scalar2iso($vref->{$_});
# Line 55  sub var_NumericalHashToArray { Line 110  sub var_NumericalHashToArray {
110  }  }
111    
112    
113  sub var_deref {  # FIXME: could this be refactored using expand?
114    # btw: "expand": look at scripts@CPAN (System Administration):
115    # there is a perl make with perl
116    sub _var_deref_test {
117    my $obj = shift;    my $obj = shift;
118      my $options = shift;
119    my $result;    my $result;
120    if ((ref $obj) eq 'ARRAY') {    if ((ref $obj) eq 'ARRAY') {
121      foreach (@{$obj}) {      foreach (@{$obj}) {
122        my $ref = ref $_;        my $ref = ref $_;
123        if ($ref) {        if ($ref) {
124          push(@{$result}, var_deref($_));          push(@{$result}, var_deref($_, $options));
125            #undef $_;
126        } else {        } else {
127          push(@{$result}, $_);          #push(@{$result}, $_);
128            push(@{$result}, deep_copy($_));
129        }        }
130          #undef $_ if $options->{destroy};
131          #$options->{destroy}->($_) if $options->{destroy};
132      }      }
133      # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
134    } else {    } else {
135      foreach (keys %{$obj}) {      foreach (keys %{$obj}) {
136        my $key = $_;        my $key = $_;
137        my $ref = ref $obj->{$_};        my $ref = ref $obj->{$_};
138        if ($ref) {        if ($ref) {
139          $result->{$_} = var_deref($obj->{$_});          $result->{$_} = var_deref($obj->{$_}, $options);
140            #undef $obj->{$_};
141        } else {        } else {
142          $result->{$_} = $obj->{$_};          #$result->{$_} = $obj->{$_};
143            $result->{$_} = deep_copy($obj->{$_});
144        }        }
145          #undef $obj->{$_} if $options->{destroy};
146          #$options->{destroy}->($obj->{$_}) if $options->{destroy};
147      }      }
148    }    }
149      #undef $obj if $options->{destroy};
150      $options->{cb_destroy}->($obj) if $options->{cb_destroy};
151    return $result;    return $result;
152  }  }
153    
154    
155    # convert values in hash to utf8 (and back) to be ready for (e.g.) encapsulation in XML
156    # but still using the known latin locale stuff
157    sub expand {
158    
159      my $obj = shift;
160      my $options = shift;
161      my $result;
162    
163      #print "ref: ", ref $obj, "\n";
164    
165      if (ref $obj eq 'ARRAY') {
166    
167        IterArray @$obj, sub {
168          my $item;
169          # if current item is a reference ...
170          if (ref $_[0]) {
171            $item = $_[0];
172            # if $options->{childObj2string} is TRUE or STRING don't expand referenced object,
173            # instead replace it by per option choosed string (default: o_<classname>_<ref type>_<guid> )
174            if ($item && $options->{childObj2string}) {
175              $item = childObj2string($item, $options->{childObj2string});
176            } else {
177              # ... expand structure recursively
178              $item = expand($_[0], $options);
179            }
180            # destroy item via seperate callback method (a POST) if requested
181            #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};
182    
183          # ... assume plain scalar
184          } else {
185            #$item = deep_copy($_[0]);
186            $item = $_[0];
187            # conversions/encodings
188            $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
189            $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
190          }
191          #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)
192          push(@{$result}, $item);                 # use item in any case
193    
194        }
195    
196      } elsif (ref $obj eq 'CODE') {
197        #print Dumper($obj);
198        #exit;
199    
200      # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
201      } elsif (ref $obj) {
202    
203        IterHash %$obj, sub {
204          my $item;
205          
206          # if current item is a reference ...
207          if (ref $_[1]) {
208            $item = $_[1];
209            # if $options->{childObj2string} is TRUE or STRING don't expand referenced object,
210            # instead replace it by per option choosed string (default: o_<classname>_<ref type>_<guid> )
211            if ($item && $options->{childObj2string} && !(ref $_[1] eq "ARRAY") && !(ref $_[1] eq "HASH")) {
212              $item = childObj2string($item, $options->{childObj2string});
213            } else {
214              # ... expand structure recursively
215              $item = expand($_[1], $options);
216            }
217            # destroy item via seperate callback method (a POST) if requested
218            #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
219          
220          # ... assume plain scalar
221          } else {
222            #$item = deep_copy($_[1]);
223            $item = $_[1];
224            # conversions/encodings
225            $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
226            $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
227          }
228          #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)
229          $result->{$_[0]} = $item;               # use item in any case
230        }
231    
232      } else {
233        #die ("not a reference!");
234        $result = $obj;
235    
236      }
237    
238      # convert all values to utf8 (inside complex struct)
239        # now done in core-item-callbacks via Greg London's "Iterate" from CPAN
240        # latin_to_utf8($result) if ($options->{utf8});
241    
242      # destroy persistent object from memory to be sure to get a fresh one next time
243      #undef $obj if $options->{destroy};
244      #$options->{cb_destroy}->($obj) if $options->{cb_destroy};
245      #$options->{cb}->{destroy}->($obj) if $options->{destroy};
246      
247      return $result;
248    }
249    
250    
251    
252  my @indexstack;  my @indexstack;
253  sub var_traverse_mixin_update {  sub _var_traverse_mixin_update_old {
254    my $obj = shift;    my $obj = shift;
255    my $data = shift;    my $data = shift;
256    my $bool_recursion = shift;    my $bool_recursion = shift;
# Line 129  sub var_traverse_mixin_update { Line 294  sub var_traverse_mixin_update {
294    #return $result;    #return $result;
295  }  }
296    
297  sub getStructSlotByStringyAddress {  sub merge_to {
298    my $var = shift;    _hash2object(@_);
299    my $indexstack_ref = shift;    # TODO:
300    my @indexstack = @{$indexstack_ref};    # re-implement using CPAN's "Iterate" and/or a modified Hash::Merge.
301    my $joiner = '->';  }
302    my @evlist;  
303    foreach (@indexstack) {  
304      my $elem;  # todo: maybe do diff(s) here sometimes!?
305      if ($_ =~ m/\d+/) { $elem = "[$_]"; }  sub _hash2object {
306      if ($_ =~ m/\D+/) { $elem = "{$_}"; }    my $object = shift;
307      push @evlist, $elem;    my $data = shift;
308    }    my $options = shift;
309    my $evstring = join($joiner, @evlist);  
310    $evstring = 'return $var->' . $evstring . ';';    #print "hash2object", "\n";
311    #print "ev: $evstring\n";    
312    return eval($evstring);    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
313      # this method corrects this
314      numhash2list($data) if ($options->{php});
315    
316      # utf8-conversion/-encoding (essential for I18N)
317      utf8_to_latin($data) if ($options->{utf8});
318    
319      # get fresh object from database
320      # todo:
321      #   - handle "locked" objects !!!
322      #   - check if already another update occoured (object-revisioning needed!)
323      #my $obj = $self->getObject($oid);
324    
325      # mix changes into fresh object and save it back
326      _hash2object_traverse_mixin($object, $data, 0, $options);
327    
328      # done in core mixin function?
329      #$self->{storage}->update($obj);
330    
331      # we should "undef" some objects here to destroy them in memory and enforce reloading when used next time
332      # simulate:
333      #$self->{storage}->disconnect();
334    
335    }
336    
337    # ------------------------------------
338    #   core mixin function
339    # TODO-FEATURE: make this possible in a reverse way: object is empty (no fields) and gets filled up by mixin-data
340    
341    # remember keys of structures we are traversing
342    # this is a HACK:
343    #  - don't (!!!) "packageglobal" @indexstack
344    #  - it will lead to problems with parallelism!
345    
346    #my @indexstack;
347    
348    # traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object
349    sub _hash2object_traverse_mixin {
350      my $object = shift;
351      my $data = shift;
352      my $bool_recursion = shift;
353      my $options = shift;
354    
355      # clear our key - stack if we are called from user-code (non-recursively)
356      @indexstack = () if (!$bool_recursion);
357    
358      my $classname = ref $object;
359    #  if ($classname) {
360    #    print STDERR "*****************", Dumper(Class::Tangram::attribute_types($classname)), "\n";
361    #  }
362    
363      # parser: detected OBJECT (a Tangram one?)   (reftype == HASH) (assume)
364      # what's exactly done here? hmmm.... it works ;)
365      # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
366      # extend! check!
367      
368      #print attributes::reftype($object), "\n";
369      
370      # V1
371      #if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
372      # V2
373      my $reftype = attributes::reftype($object);
374      #print "reftype: '$reftype'", "\n";
375      if ($reftype eq 'HASH') {
376    
377    #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
378            
379        my @fields;
380        # loop through fields of object (Tangram-object)
381        @fields = keys %{$object};
382    
383        # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
384        @fields = keys %{$data} if $options->{init};
385    #    @fields = keys %{$data} if $options->{mixin};
386        
387        foreach (@fields) {
388          my $field = $_;
389          push @indexstack, $field;
390                
391          # determine type of object
392          my $ref = ref $object->{$field};
393    #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
394          if ($ref) {
395            _hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
396          } else {
397            my $val = ref_slot($data, \@indexstack);
398            
399    #print Dumper($options);
400            my $field_target = $field;
401            if (my $pattern = $options->{pattern_strip_key}) {
402              print "pattern: $pattern", "\n";
403              $field_target =~ s/$pattern//;
404              print "field: $field_target", "\n";
405            }
406    
407            $object->{$field_target} = $val if defined $val;
408          }
409          pop @indexstack;
410        }
411    
412        # save object to database ...
413        # ... do an update if it already exists, do an insert if it doesn't
414    #    my $objectId = $self->{storage}->id($obj);
415    #    $logger->debug( __PACKAGE__ . "->saveObjectFromHash_traverse_mixin_update( object $obj objectId $objectId )" );
416    #    if ($objectId) {
417    #      $self->{storage}->update($obj);
418    
419    #print __PACKAGE__ . ":", "\n";
420    #print Dumper($object);
421    
422    #    } else {
423    #      $self->{storage}->insert($obj);
424    #    }
425        
426      }
427    
428    #&& ( ref($obj) ne 'HASH' )
429    
430        # loop through entries of array (IntrArray, isn't it?)
431      if ((ref $object) eq 'ARRAY') {
432    #    print STDERR "===", "refttype ", attributes::reftype($obj), "\n";
433        my $i = 0;
434        foreach (@{$object}) {
435          push @indexstack, $i;
436          my $ref = ref $_;
437    #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
438    #      if ($ref && $_) {
439          if ($ref) {
440            _hash2object_traverse_mixin($_, $data, 1, $options);
441          } else {
442            $object->[$i] = $_ if defined $_;
443          }
444          pop @indexstack;
445          $i++;
446        }
447    
448    =pod
449      # object?
450      } else {
451        print "reference: ", ref $object, "\n";
452        print "reftype: ", $reftype, "\n";
453        die(__PACKAGE__ . "->_hash2object_traverse_mixin: can not handle this!");
454    =cut
455      
456      }
457    
458    }
459    
460    
461    # ACK's go to Randal L. Schwartz <merlyn@stonehenge.com>
462    # on the website:
463    # This text is copyright by Miller-Freeman, Inc., and is used with their permission.
464    # Further distribution or use is not permitted.
465    # please visit http://www.stonehenge.com/merlyn/UnixReview/col30.html
466    sub deep_copy1 {
467      my $this = shift;
468      if (not ref $this) {
469        $this;
470      } elsif (ref $this eq "ARRAY") {
471        [map deep_copy1($_), @$this];
472      } elsif (ref $this eq "HASH") {
473        +{map { $_ => deep_copy1($this->{$_}) } keys %$this};
474      } elsif (ref $this eq "CODE") {
475        $this;
476      } else { die "deep_copy1 asks: what type is $this?" }
477      #} else { print "deep_copy asks: what type is $this?", "\n"; }
478  }  }
479    
480    # ACK's go to Andrew Pitonyak
481    # Copyright 2002, Andrew Pitonyak (perlboy@pitonyak.org)
482    # please visit: http://www.pitonyak.org/code/perl/Pitonyak/DeepCopy.pm.html
483    sub deep_copy {
484      Pitonyak::DeepCopy::deep_copy(@_);
485    }
486    
487    
488    sub childObj2string {
489      my $obj = shift;
490      my $option = shift;
491      my $classname = ref $obj;
492      
493      if($option == 1) {
494        my $string = "o_" . $classname . "_" .$obj->{guid};
495        return $string;
496      }  
497    }
498    
499    
500  1;  1;
501    __END__
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