/[cvs]/nfo/perl/libs/Data/Mungle/Transform/Deep.pm
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revision 1.5 by joko, Mon Dec 16 19:57:54 2002 UTC revision 1.11 by joko, Thu Feb 20 21:13:54 2003 UTC
# Line 1  Line 1 
1  ##############################################  ## ---------------------------------------------------------------------------
2  #  ##  $Id$
3  #  $Id$  ## ---------------------------------------------------------------------------
4  #  ##  $Log$
5  #  $Log$  ##  Revision 1.11  2003/02/20 21:13:54  joko
6  #  Revision 1.5  2002/12/16 19:57:54  joko  ##  - removed implementation of deep_copy2 - get this from the Pitonyak namespace (now cloned to repository)
7  #  + option 'init'  ##
8  #  ##  Revision 1.10  2003/02/20 20:48:00  joko
9  #  Revision 1.4  2002/12/05 13:56:49  joko  ##  - refactored lots of code to Data::Code::Ref
10  #  - var_deref  ##  + alternative 'deep_copy' implementation
11  #  + expand - more sophisticated dereferencing with callbacks using Iterate  ##
12  #  ##  Revision 1.9  2003/02/18 19:35:56  joko
13  #  Revision 1.3  2002/12/03 05:34:55  joko  ##  +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
14  #  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode  ##
15  #  ##  Revision 1.8  2003/02/09 05:10:56  joko
16  #  Revision 1.2  2002/12/01 04:44:07  joko  ##  + minor update
17  #  + code from Data::Transform::OO  ##
18  #  ##  Revision 1.7  2003/01/19 03:26:59  joko
19  #  Revision 1.1  2002/11/29 04:49:20  joko  ##  + added 'sub deep_copy'  -  refactored from libp
20  #  + initial check-in  ##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'
21  #  ##
22  #  Revision 1.1  2002/10/10 03:26:00  cvsjoko  ##  Revision 1.6  2002/12/23 11:27:53  jonen
23  #  + new  ##  + changed behavior WATCH!
24  #  ##
25  ##############################################  ##  Revision 1.5  2002/12/16 19:57:54  joko
26    ##  + option 'init'
27    ##
28    ##  Revision 1.4  2002/12/05 13:56:49  joko
29    ##  - var_deref
30    ##  + expand - more sophisticated dereferencing with callbacks using Iterate
31    ##
32    ##  Revision 1.3  2002/12/03 05:34:55  joko
33    ##  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
34    ##
35    ##  Revision 1.2  2002/12/01 04:44:07  joko
36    ##  + code from Data::Transform::OO
37    ##
38    ##  Revision 1.1  2002/11/29 04:49:20  joko
39    ##  + initial check-in
40    ##
41    ##  Revision 1.1  2002/10/10 03:26:00  cvsjoko
42    ##  + new
43    ## ---------------------------------------------------------------------------
44    
45    
46  package Data::Transform::Deep;  package Data::Transform::Deep;
# Line 33  use warnings; Line 51  use warnings;
51  require Exporter;  require Exporter;
52  our @ISA = qw( Exporter );  our @ISA = qw( Exporter );
53  our @EXPORT_OK = qw(  our @EXPORT_OK = qw(
   &var_NumericalHashToArray  
   &var_mixin  
   &object2hash  
   &hash2object  
   &refexpr2perlref  
54    &expand    &expand
55      &deep_copy
56      &merge_to
57  );  );
58  #  &var_deref  
 #  &getStructSlotByStringyAddress  
59    
60  use attributes;  use attributes;
61  use Data::Dumper;  use Data::Dumper;
 use Data::Transform::Encode qw( var_utf2iso var2utf8 scalar2utf8 );  
 use libp qw( deep_copy );  
62  use Iterate;  use Iterate;
63    
64  sub var_NumericalHashToArray {  use Data::Transform::Encode qw( latin_to_utf8 latin_to_utf8_scalar utf8_to_latin utf8_to_latin_scalar );
65    use Data::Code::Ref qw( ref_slot );
66    
67    sub numhash2list {
68    my $vref = shift;    my $vref = shift;
69    #my $context = shift;    #my $context = shift;
70    if (ref $vref eq 'HASH') {    if (ref $vref eq 'HASH') {
# Line 65  sub var_NumericalHashToArray { Line 80  sub var_NumericalHashToArray {
80                }                }
81                $vref->{$_} = \@arr;                $vref->{$_} = \@arr;
82              }              }
83              var_NumericalHashToArray($vref->{$_});              numhash2list($vref->{$_});
84            }            }
85  #      } else {  #      } else {
86  #        #$vref->{$_} = scalar2iso($vref->{$_});  #        #$vref->{$_} = scalar2iso($vref->{$_});
# Line 75  sub var_NumericalHashToArray { Line 90  sub var_NumericalHashToArray {
90  }  }
91    
92    
93  sub var_deref {  # FIXME: could this be refactored using expand?
94    # btw: "expand": look at scripts@CPAN (System Administration):
95    # there is a perl make with perl
96    sub _var_deref_test {
97    my $obj = shift;    my $obj = shift;
98    my $options = shift;    my $options = shift;
99    my $result;    my $result;
# Line 120  sub expand { Line 138  sub expand {
138    my $options = shift;    my $options = shift;
139    my $result;    my $result;
140    
141    if ((ref $obj) eq 'ARRAY') {    #print "ref: ", ref $obj, "\n";
142    
143      if (ref $obj eq 'ARRAY') {
144    
145      IterArray @$obj, sub {      IterArray @$obj, sub {
146        my $item;        my $item;
# Line 136  sub expand { Line 156  sub expand {
156          #$item = deep_copy($_[0]);          #$item = deep_copy($_[0]);
157          $item = $_[0];          $item = $_[0];
158          # conversions/encodings          # conversions/encodings
159          $item = scalar2utf8($item) if ($item && $options->{utf8});          $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
160            $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
161        }        }
162        #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)        #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)
163        push(@{$result}, $item);                 # use item in any case        push(@{$result}, $item);                 # use item in any case
164    
165      }      }
166    
167      } elsif (ref $obj eq 'CODE') {
168        #print Dumper($obj);
169        #exit;
170    
171    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
172    } else {    } elsif (ref $obj) {
173    
174      IterHash %$obj, sub {      IterHash %$obj, sub {
175        my $item;        my $item;
# Line 161  sub expand { Line 186  sub expand {
186          #$item = deep_copy($_[1]);          #$item = deep_copy($_[1]);
187          $item = $_[1];          $item = $_[1];
188          # conversions/encodings          # conversions/encodings
189          $item = scalar2utf8($item) if ($item && $options->{utf8});          $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
190            $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
191        }        }
192        #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)        #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)
193        $result->{$_[0]} = $item;               # use item in any case        $result->{$_[0]} = $item;               # use item in any case
194      }      }
195    
196      } else {
197        #die ("not a reference!");
198        $result = $obj;
199    
200    }    }
201    
202    # convert all values to utf8 (inside complex struct)    # convert all values to utf8 (inside complex struct)
# Line 184  sub expand { Line 214  sub expand {
214    
215    
216  my @indexstack;  my @indexstack;
217  sub var_traverse_mixin_update {  sub _var_traverse_mixin_update_old {
218    my $obj = shift;    my $obj = shift;
219    my $data = shift;    my $data = shift;
220    my $bool_recursion = shift;    my $bool_recursion = shift;
# Line 228  sub var_traverse_mixin_update { Line 258  sub var_traverse_mixin_update {
258    #return $result;    #return $result;
259  }  }
260    
261  sub object2hash {  sub merge_to {
262    my $object = shift;    _hash2object(@_);
263    my $options = shift;    # TODO:
264    #my $deref = var_deref($object);    # re-implement using CPAN's "Iterate".
   my $deref = expand($object, $options);  
   #var2utf8($deref) if ($options->{utf8});  
   return $deref;  
265  }  }
266    
267    
268  # todo: maybe do diff(s) here sometimes!?  # todo: maybe do diff(s) here sometimes!?
269  sub hash2object {  sub _hash2object {
270    my $object = shift;    my $object = shift;
271    my $data = shift;    my $data = shift;
272    my $options = shift;    my $options = shift;
# Line 247  sub hash2object { Line 275  sub hash2object {
275        
276    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
277    # this method corrects this    # this method corrects this
278    var_NumericalHashToArray($data) if ($options->{php});    numhash2list($data) if ($options->{php});
279    
280    # utf8-conversion/-encoding (essential for I18N)    # utf8-conversion/-encoding (essential for I18N)
281    var_utf2iso($data) if ($options->{utf8});    var_utf2iso($data) if ($options->{utf8});
# Line 259  sub hash2object { Line 287  sub hash2object {
287    #my $obj = $self->getObject($oid);    #my $obj = $self->getObject($oid);
288    
289    # mix changes into fresh object and save it back    # mix changes into fresh object and save it back
290    hash2object_traverse_mixin($object, $data, 0, $options);    _hash2object_traverse_mixin($object, $data, 0, $options);
291    
292    # done in core mixin function?    # done in core mixin function?
293    #$self->{storage}->update($obj);    #$self->{storage}->update($obj);
# Line 282  sub hash2object { Line 310  sub hash2object {
310  #my @indexstack;  #my @indexstack;
311    
312  # traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object  # traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object
313  sub hash2object_traverse_mixin {  sub _hash2object_traverse_mixin {
314    my $object = shift;    my $object = shift;
315    my $data = shift;    my $data = shift;
316    my $bool_recursion = shift;    my $bool_recursion = shift;
# Line 300  sub hash2object_traverse_mixin { Line 328  sub hash2object_traverse_mixin {
328    # what's exactly done here? hmmm.... it works ;)    # what's exactly done here? hmmm.... it works ;)
329    # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!    # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
330    # extend! check!    # extend! check!
331    if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {    
332      #print attributes::reftype($object), "\n";
333      
334      # V1
335      #if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
336      # V2
337      my $reftype = attributes::reftype($object);
338      #print "reftype: '$reftype'", "\n";
339      if ($reftype eq 'HASH') {
340    
341  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
342                    
# Line 310  sub hash2object_traverse_mixin { Line 346  sub hash2object_traverse_mixin {
346    
347      # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)      # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
348      @fields = keys %{$data} if $options->{init};      @fields = keys %{$data} if $options->{init};
349    #    @fields = keys %{$data} if $options->{mixin};
350            
351      foreach (@fields) {      foreach (@fields) {
352        push @indexstack, $_;        my $field = $_;
353          push @indexstack, $field;
354                            
355        # determine type of object        # determine type of object
356        my $ref = ref $object->{$_};        my $ref = ref $object->{$field};
357  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
358        if ($ref) {        if ($ref) {
359          hash2object_traverse_mixin($object->{$_}, $data, 1, $options);          _hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
360        } else {        } else {
361          my $val = getStructSlotByStringyAddress($data, \@indexstack);          my $val = ref_slot($data, \@indexstack);
362          $object->{$_} = $val;                  
363    #print Dumper($options);
364            my $field_target = $field;
365            if (my $pattern = $options->{pattern_strip_key}) {
366              print "pattern: $pattern", "\n";
367              $field_target =~ s/$pattern//;
368              print "field: $field_target", "\n";
369            }
370    
371            $object->{$field_target} = $val if defined $val;
372        }        }
373        pop @indexstack;        pop @indexstack;
374      }      }
# Line 352  sub hash2object_traverse_mixin { Line 399  sub hash2object_traverse_mixin {
399        push @indexstack, $i;        push @indexstack, $i;
400        my $ref = ref $_;        my $ref = ref $_;
401  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
402        if ($ref && $_) {  #      if ($ref && $_) {
403          hash2object_traverse_mixin($_, $data, 1, $options);        if ($ref) {
404            _hash2object_traverse_mixin($_, $data, 1, $options);
405        } else {        } else {
406          $object->[$i] = $_;          $object->[$i] = $_ if defined $_;
407        }        }
408        pop @indexstack;        pop @indexstack;
409        $i++;        $i++;
410      }      }
   }  
   
 }  
   
   
 # this function seems to do similar stuff like these below (refexpr2perlref & co.)  
 # TODO: maybe this mechanism can be replaced completely through some nice module from CPAN .... ?   ;-)  
 sub getStructSlotByStringyAddress {  
   my $var = shift;  
   my $indexstack_ref = shift;  
   my @indexstack = @{$indexstack_ref};  
   my $joiner = '->';  
   my @evlist;  
   foreach (@indexstack) {  
     my $elem;  
     if ($_ =~ m/\d+/) { $elem = "[$_]"; }  
     if ($_ =~ m/\D+/) { $elem = "{$_}"; }  
     push @evlist, $elem;  
   }  
   my $evstring = join($joiner, @evlist);  
   $evstring = 'return $var->' . $evstring . ';';  
   #print "ev: $evstring\n";  
   return eval($evstring);  
 }  
   
   
 sub refexpr2perlref {  
   
   my $obj = shift;  
   my $expr = shift;  
   my $callbackMap = shift;  
   
   my $value;  
   # detect for callback (code-reference)  
   if (ref($expr) eq 'CODE') {  
     $value = &$expr($obj);  
   
   } elsif ($expr =~ m/->/) {  
     # use expr as complex object reference declaration (obj->subObj->subSubObj->0->attribute)  
     (my $objPerlRefString, my $parts) = refexpr2perlref_parts($expr);  
     #print "\n", "expr: $expr";  
     #print "\n", "objPerlRefString: $objPerlRefString";  
     $value = eval('$obj' . '->' . $objPerlRefString);  
       
     # if value isn't set, try to "fallback" to callbackMap  
     # callbacks are applied this way:  
     #   take the last element of the expression parts and check if this string exists as a key in the callback-map  
     if (!$value && $callbackMap) {  
       #print Dumper($callbackMap);  
         
       # prepare needle  
       my @parts = @$parts;  
       my $count = $#parts;  
       my $needle = $parts[$count];  
   
       # prepare haystack  
       my @haystack = keys %$callbackMap;  
       if (grep($needle, @haystack)) {  
         $value = $callbackMap->{$needle}->();  
         #print "value: ", $value, "\n";  
       }  
     }  
411    
412    =pod
413      # object?
414    } else {    } else {
415      # use expr as simple scalar key (attributename)      print "reference: ", ref $object, "\n";
416      $value = $obj->{$expr};      print "reftype: ", $reftype, "\n";
417    }      die(__PACKAGE__ . "->_hash2object_traverse_mixin: can not handle this!");
418              =cut
   return $value;  
419        
420  }    }
   
421    
422  sub refexpr2perlref_parts {  }
   my $expr = shift;  
423    
   # split expression by dereference operators first  
   my @parts_pure = split(/->/, $expr);  
424    
425    # wrap []'s around each part, if it consists of numeric characters only (=> numeric = array-index),  # ACK's go to Randal L. Schwartz <merlyn@stonehenge.com>
426    # use {}'s, if there are word-characters in it (=> alphanumeric = hash-key)  # on the website:
427    my @parts_capsule = @parts_pure;  # This text is copyright by Miller-Freeman, Inc., and is used with their permission.
428    map {  # Further distribution or use is not permitted.
429      m/^\d+$/ && ($_ = "[$_]") || ($_ = "{$_}");  # please visit http://www.stonehenge.com/merlyn/UnixReview/col30.html
430    } @parts_capsule;  sub deep_copy1 {
431      my $this = shift;
432      if (not ref $this) {
433        $this;
434      } elsif (ref $this eq "ARRAY") {
435        [map deep_copy1($_), @$this];
436      } elsif (ref $this eq "HASH") {
437        +{map { $_ => deep_copy1($this->{$_}) } keys %$this};
438      } elsif (ref $this eq "CODE") {
439        $this;
440      } else { die "deep_copy1 asks: what type is $this?" }
441      #} else { print "deep_copy asks: what type is $this?", "\n"; }
442    }
443    
444    # join parts with dereference operators together again and return built string  # ACK's go to Andrew Pitonyak
445    return (join('->', @parts_capsule), \@parts_pure);  # Copyright 2002, Andrew Pitonyak (perlboy@pitonyak.org)
446    # please visit: http://www.pitonyak.org/code/perl/Pitonyak/DeepCopy.pm.html
447    sub deep_copy {
448      Pitonyak::deep_copy(@_);
449  }  }
450    
451  1;  1;
452    __END__
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