/[cvs]/nfo/perl/libs/Data/Mungle/Transform/Deep.pm
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revision 1.2 by joko, Sun Dec 1 04:44:07 2002 UTC revision 1.7 by joko, Sun Jan 19 03:26:59 2003 UTC
# Line 1  Line 1 
1  ##############################################  ## ---------------------------------------------------------------------------
2  #  ##  $Id$
3  #  $Id$  ## ---------------------------------------------------------------------------
4  #  ##  $Log$
5  #  $Log$  ##  Revision 1.7  2003/01/19 03:26:59  joko
6  #  Revision 1.2  2002/12/01 04:44:07  joko  ##  + added 'sub deep_copy'  -  refactored from libp
7  #  + code from Data::Transform::OO  ##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'
8  #  ##
9  #  Revision 1.1  2002/11/29 04:49:20  joko  ##  Revision 1.6  2002/12/23 11:27:53  jonen
10  #  + initial check-in  ##  + changed behavior WATCH!
11  #  ##
12  #  Revision 1.1  2002/10/10 03:26:00  cvsjoko  ##  Revision 1.5  2002/12/16 19:57:54  joko
13  #  + new  ##  + option 'init'
14  #  ##
15  ##############################################  ##  Revision 1.4  2002/12/05 13:56:49  joko
16    ##  - var_deref
17    ##  + expand - more sophisticated dereferencing with callbacks using Iterate
18    ##
19    ##  Revision 1.3  2002/12/03 05:34:55  joko
20    ##  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
21    ##
22    ##  Revision 1.2  2002/12/01 04:44:07  joko
23    ##  + code from Data::Transform::OO
24    ##
25    ##  Revision 1.1  2002/11/29 04:49:20  joko
26    ##  + initial check-in
27    ##
28    ##  Revision 1.1  2002/10/10 03:26:00  cvsjoko
29    ##  + new
30    ## ---------------------------------------------------------------------------
31    
32    
33  package Data::Transform::Deep;  package Data::Transform::Deep;
# Line 24  require Exporter; Line 39  require Exporter;
39  our @ISA = qw( Exporter );  our @ISA = qw( Exporter );
40  our @EXPORT_OK = qw(  our @EXPORT_OK = qw(
41    &var_NumericalHashToArray    &var_NumericalHashToArray
   &var_deref  
42    &var_mixin    &var_mixin
43    &object2hash    &object2hash
44    &hash2object    &hash2object
45    &refexpr2perlref    &refexpr2perlref
46      &expand
47      &deep_copy
48      &merge
49  );  );
50    #  &var_deref
51  #  &getStructSlotByStringyAddress  #  &getStructSlotByStringyAddress
52    
53  use attributes;  use attributes;
54  use Data::Dumper;  use Data::Dumper;
55    use Data::Transform::Encode qw( var_utf2iso var2utf8 scalar2utf8 );
56    
57    use Hash::Merge qw( merge );
58    #use libp qw( deep_copy );
59    use Iterate;
60    
61  sub var_NumericalHashToArray {  sub var_NumericalHashToArray {
62    my $vref = shift;    my $vref = shift;
# Line 64  sub var_NumericalHashToArray { Line 86  sub var_NumericalHashToArray {
86    
87  sub var_deref {  sub var_deref {
88    my $obj = shift;    my $obj = shift;
89      my $options = shift;
90    my $result;    my $result;
91    if ((ref $obj) eq 'ARRAY') {    if ((ref $obj) eq 'ARRAY') {
92      foreach (@{$obj}) {      foreach (@{$obj}) {
93        my $ref = ref $_;        my $ref = ref $_;
94        if ($ref) {        if ($ref) {
95          push(@{$result}, var_deref($_));          push(@{$result}, var_deref($_, $options));
96            #undef $_;
97        } else {        } else {
98          push(@{$result}, $_);          #push(@{$result}, $_);
99            push(@{$result}, deep_copy($_));
100        }        }
101          #undef $_ if $options->{destroy};
102          #$options->{destroy}->($_) if $options->{destroy};
103      }      }
104    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
105    } else {    } else {
# Line 80  sub var_deref { Line 107  sub var_deref {
107        my $key = $_;        my $key = $_;
108        my $ref = ref $obj->{$_};        my $ref = ref $obj->{$_};
109        if ($ref) {        if ($ref) {
110          $result->{$_} = var_deref($obj->{$_});          $result->{$_} = var_deref($obj->{$_}, $options);
111            #undef $obj->{$_};
112        } else {        } else {
113          $result->{$_} = $obj->{$_};          #$result->{$_} = $obj->{$_};
114            $result->{$_} = deep_copy($obj->{$_});
115        }        }
116          #undef $obj->{$_} if $options->{destroy};
117          #$options->{destroy}->($obj->{$_}) if $options->{destroy};
118      }      }
119    }    }
120      #undef $obj if $options->{destroy};
121      $options->{cb_destroy}->($obj) if $options->{cb_destroy};
122    return $result;    return $result;
123  }  }
124    
125    
126    sub expand {
127    
128      my $obj = shift;
129      my $options = shift;
130      my $result;
131    
132      if ((ref $obj) eq 'ARRAY') {
133    
134        IterArray @$obj, sub {
135          my $item;
136          # if current item is a reference ...
137          if (ref $_[0]) {
138            # ... expand structure recursively
139            $item = expand($_[0], $options);
140            # destroy item via seperate callback method (a POST) if requested
141            #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};
142    
143          # ... assume plain scalar
144          } else {
145            #$item = deep_copy($_[0]);
146            $item = $_[0];
147            # conversions/encodings
148            $item = scalar2utf8($item) if ($item && $options->{utf8});
149          }
150          #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)
151          push(@{$result}, $item);                 # use item in any case
152    
153        }
154    
155      # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
156      } else {
157    
158        IterHash %$obj, sub {
159          my $item;
160          
161          # if current item is a reference ...
162          if (ref $_[1]) {
163            # ... expand structure recursively
164            $item = expand($_[1], $options);
165            # destroy item via seperate callback method (a POST) if requested
166            #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
167          
168          # ... assume plain scalar
169          } else {
170            #$item = deep_copy($_[1]);
171            $item = $_[1];
172            # conversions/encodings
173            $item = scalar2utf8($item) if ($item && $options->{utf8});
174          }
175          #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)
176          $result->{$_[0]} = $item;               # use item in any case
177        }
178    
179      }
180    
181      # convert all values to utf8 (inside complex struct)
182        # now done in core-item-callbacks via Greg London's "Iterate" from CPAN
183        # var2utf8($result) if ($options->{utf8});
184    
185      # destroy persistent object from memory to be sure to get a fresh one next time
186      #undef $obj if $options->{destroy};
187      #$options->{cb_destroy}->($obj) if $options->{cb_destroy};
188      #$options->{cb}->{destroy}->($obj) if $options->{destroy};
189      
190      return $result;
191    }
192    
193    
194    
195  my @indexstack;  my @indexstack;
# Line 140  sub var_traverse_mixin_update { Line 240  sub var_traverse_mixin_update {
240  sub object2hash {  sub object2hash {
241    my $object = shift;    my $object = shift;
242    my $options = shift;    my $options = shift;
243    my $deref = var_deref($object);    #my $deref = var_deref($object);
244    var2utf8($deref) if ($options->{utf8});    my $deref = expand($object, $options);
245      #var2utf8($deref) if ($options->{utf8});
246    return $deref;    return $deref;
247  }  }
248    
# Line 151  sub hash2object { Line 252  sub hash2object {
252    my $data = shift;    my $data = shift;
253    my $options = shift;    my $options = shift;
254    
255      #print "hash2object", "\n";
256      
257    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
258    # this method corrects this    # this method corrects this
259    var_NumericalHashToArray($data) if ($options->{php});    var_NumericalHashToArray($data) if ($options->{php});
# Line 165  sub hash2object { Line 268  sub hash2object {
268    #my $obj = $self->getObject($oid);    #my $obj = $self->getObject($oid);
269    
270    # mix changes into fresh object and save it back    # mix changes into fresh object and save it back
271    hash2object_traverse_mixin($object, $data);    hash2object_traverse_mixin($object, $data, 0, $options);
272    
273    # done in core mixin function?    # done in core mixin function?
274    #$self->{storage}->update($obj);    #$self->{storage}->update($obj);
# Line 192  sub hash2object_traverse_mixin { Line 295  sub hash2object_traverse_mixin {
295    my $object = shift;    my $object = shift;
296    my $data = shift;    my $data = shift;
297    my $bool_recursion = shift;    my $bool_recursion = shift;
298      my $options = shift;
299    
300    # clear our key - stack if we are called from user-code (non-recursively)    # clear our key - stack if we are called from user-code (non-recursively)
301    @indexstack = () if (!$bool_recursion);    @indexstack = () if (!$bool_recursion);
# Line 209  sub hash2object_traverse_mixin { Line 313  sub hash2object_traverse_mixin {
313    
314  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
315                    
316        my @fields;
317      # loop through fields of object (Tangram-object)      # loop through fields of object (Tangram-object)
318      foreach (keys %{$object}) {      @fields = keys %{$object};
319        push @indexstack, $_;  
320        # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
321        @fields = keys %{$data} if $options->{init};
322    #    @fields = keys %{$data} if $options->{mixin};
323        
324        foreach (@fields) {
325          my $field = $_;
326          push @indexstack, $field;
327                            
328        # determine type of object        # determine type of object
329        my $ref = ref $object->{$_};        my $ref = ref $object->{$field};
330  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
331        if ($ref) {        if ($ref) {
332          hash2object_traverse_mixin($object->{$_}, $data, 1);          hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
333        } else {        } else {
334          my $val = getStructSlotByStringyAddress($data, \@indexstack);          my $val = getStructSlotByStringyAddress($data, \@indexstack);
335          $object->{$_} = $val;                  
336    print Dumper($options);
337            my $field_target = $field;
338            if (my $pattern = $options->{pattern_strip_key}) {
339              print "pattern: $pattern", "\n";
340              $field_target =~ s/$pattern//;
341              print "field: $field_target", "\n";
342            }
343    
344            $object->{$field_target} = $val if defined $val;
345        }        }
346        pop @indexstack;        pop @indexstack;
347      }      }
# Line 251  sub hash2object_traverse_mixin { Line 372  sub hash2object_traverse_mixin {
372        push @indexstack, $i;        push @indexstack, $i;
373        my $ref = ref $_;        my $ref = ref $_;
374  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
375        if ($ref && $_) {  #      if ($ref && $_) {
376          hash2object_traverse_mixin($_, $data, 1);        if ($ref) {
377            hash2object_traverse_mixin($_, $data, 1, $options);
378        } else {        } else {
379          $object->[$i] = $_;          $object->[$i] = $_ if defined $_;
380        }        }
381        pop @indexstack;        pop @indexstack;
382        $i++;        $i++;
# Line 265  sub hash2object_traverse_mixin { Line 387  sub hash2object_traverse_mixin {
387    
388    
389  # this function seems to do similar stuff like these below (refexpr2perlref & co.)  # this function seems to do similar stuff like these below (refexpr2perlref & co.)
390    # TODO: maybe this mechanism can be replaced completely through some nice module from CPAN .... ?   ;-)
391  sub getStructSlotByStringyAddress {  sub getStructSlotByStringyAddress {
392    my $var = shift;    my $var = shift;
393    my $indexstack_ref = shift;    my $indexstack_ref = shift;
# Line 348  sub refexpr2perlref_parts { Line 471  sub refexpr2perlref_parts {
471    return (join('->', @parts_capsule), \@parts_pure);    return (join('->', @parts_capsule), \@parts_pure);
472  }  }
473    
474    # ACK's go to ...
475    sub deep_copy {
476      my $this = shift;
477      if (not ref $this) {
478        $this;
479      } elsif (ref $this eq "ARRAY") {
480        [map deep_copy($_), @$this];
481      } elsif (ref $this eq "HASH") {
482        +{map { $_ => deep_copy($this->{$_}) } keys %$this};
483      } elsif (ref $this eq "CODE") {
484        $this;
485      #} else { die "deep_copy asks: what type is $this?" }
486      } else { print "deep_copy asks: what type is $this?", "\n"; }
487    }
488    
489  1;  1;
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