/[cvs]/nfo/perl/libs/Data/Mungle/Transform/Deep.pm
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revision 1.7 by joko, Sun Jan 19 03:26:59 2003 UTC revision 1.14 by jonen, Sat Feb 22 17:13:55 2003 UTC
# Line 2  Line 2 
2  ##  $Id$  ##  $Id$
3  ## ---------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
4  ##  $Log$  ##  $Log$
5    ##  Revision 1.14  2003/02/22 17:13:55  jonen
6    ##  + added function 'childObject2string()' to encode 'child'-references to option related string
7    ##  + use new option at 'expand()' for replacing 'childObject2string'
8    ##
9    ##  Revision 1.13  2003/02/21 01:48:50  joko
10    ##  renamed core function
11    ##
12    ##  Revision 1.12  2003/02/20 22:45:19  joko
13    ##  fix regarding new deep_copy
14    ##
15    ##  Revision 1.11  2003/02/20 21:13:54  joko
16    ##  - removed implementation of deep_copy2 - get this from the Pitonyak namespace (now cloned to repository)
17    ##
18    ##  Revision 1.10  2003/02/20 20:48:00  joko
19    ##  - refactored lots of code to Data::Code::Ref
20    ##  + alternative 'deep_copy' implementation
21    ##
22    ##  Revision 1.9  2003/02/18 19:35:56  joko
23    ##  +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
24    ##
25    ##  Revision 1.8  2003/02/09 05:10:56  joko
26    ##  + minor update
27    ##
28  ##  Revision 1.7  2003/01/19 03:26:59  joko  ##  Revision 1.7  2003/01/19 03:26:59  joko
29  ##  + added 'sub deep_copy'  -  refactored from libp  ##  + added 'sub deep_copy'  -  refactored from libp
30  ##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'  ##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'
# Line 38  use warnings; Line 61  use warnings;
61  require Exporter;  require Exporter;
62  our @ISA = qw( Exporter );  our @ISA = qw( Exporter );
63  our @EXPORT_OK = qw(  our @EXPORT_OK = qw(
   &var_NumericalHashToArray  
   &var_mixin  
   &object2hash  
   &hash2object  
   &refexpr2perlref  
64    &expand    &expand
65    &deep_copy    &deep_copy
66    &merge    &merge_to
67  );  );
68  #  &var_deref  
 #  &getStructSlotByStringyAddress  
69    
70  use attributes;  use attributes;
71  use Data::Dumper;  use Data::Dumper;
 use Data::Transform::Encode qw( var_utf2iso var2utf8 scalar2utf8 );  
   
 use Hash::Merge qw( merge );  
 #use libp qw( deep_copy );  
72  use Iterate;  use Iterate;
73    
74  sub var_NumericalHashToArray {  use Pitonyak::DeepCopy;
75    use Data::Transform::Encode qw( latin_to_utf8 latin_to_utf8_scalar utf8_to_latin utf8_to_latin_scalar );
76    use Data::Code::Ref qw( ref_slot );
77    
78    sub numhash2list {
79    my $vref = shift;    my $vref = shift;
80    #my $context = shift;    #my $context = shift;
81    if (ref $vref eq 'HASH') {    if (ref $vref eq 'HASH') {
# Line 74  sub var_NumericalHashToArray { Line 91  sub var_NumericalHashToArray {
91                }                }
92                $vref->{$_} = \@arr;                $vref->{$_} = \@arr;
93              }              }
94              var_NumericalHashToArray($vref->{$_});              numhash2list($vref->{$_});
95            }            }
96  #      } else {  #      } else {
97  #        #$vref->{$_} = scalar2iso($vref->{$_});  #        #$vref->{$_} = scalar2iso($vref->{$_});
# Line 84  sub var_NumericalHashToArray { Line 101  sub var_NumericalHashToArray {
101  }  }
102    
103    
104  sub var_deref {  # FIXME: could this be refactored using expand?
105    # btw: "expand": look at scripts@CPAN (System Administration):
106    # there is a perl make with perl
107    sub _var_deref_test {
108    my $obj = shift;    my $obj = shift;
109    my $options = shift;    my $options = shift;
110    my $result;    my $result;
# Line 123  sub var_deref { Line 143  sub var_deref {
143  }  }
144    
145    
146    # convert values in hash to utf8 (and back) to be ready for (e.g.) encapsulation in XML
147    # but still using the known latin locale stuff
148  sub expand {  sub expand {
149    
150    my $obj = shift;    my $obj = shift;
151    my $options = shift;    my $options = shift;
152    my $result;    my $result;
153    
154    if ((ref $obj) eq 'ARRAY') {    #print "ref: ", ref $obj, "\n";
155    
156      if (ref $obj eq 'ARRAY') {
157    
158      IterArray @$obj, sub {      IterArray @$obj, sub {
159        my $item;        my $item;
160        # if current item is a reference ...        # if current item is a reference ...
161        if (ref $_[0]) {        if (ref $_[0]) {
162          # ... expand structure recursively          $item = $_[0];
163          $item = expand($_[0], $options);          # if $options->{childObj2string} is TRUE or STRING don't expand referenced object,
164            # instead replace it by per option choosed string (default: o_<classname>_<ref type>_<guid> )
165            if ($item && $options->{childObj2string}) {
166              $item = childObj2string($item, $options->{childObj2string});
167            } else {
168              # ... expand structure recursively
169              $item = expand($_[0], $options);
170            }
171          # destroy item via seperate callback method (a POST) if requested          # destroy item via seperate callback method (a POST) if requested
172          #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};          #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};
173    
# Line 145  sub expand { Line 176  sub expand {
176          #$item = deep_copy($_[0]);          #$item = deep_copy($_[0]);
177          $item = $_[0];          $item = $_[0];
178          # conversions/encodings          # conversions/encodings
179          $item = scalar2utf8($item) if ($item && $options->{utf8});          $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
180            $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
181        }        }
182        #push(@{$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 $options)
183        push(@{$result}, $item);                 # use item in any case        push(@{$result}, $item);                 # use item in any case
184    
185      }      }
186    
187      } elsif (ref $obj eq 'CODE') {
188        #print Dumper($obj);
189        #exit;
190    
191    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
192    } else {    } elsif (ref $obj) {
193    
194      IterHash %$obj, sub {      IterHash %$obj, sub {
195        my $item;        my $item;
196                
197        # if current item is a reference ...        # if current item is a reference ...
198        if (ref $_[1]) {        if (ref $_[1]) {
199          # ... expand structure recursively          $item = $_[1];
200          $item = expand($_[1], $options);          # if $options->{childObj2string} is TRUE or STRING don't expand referenced object,
201            # instead replace it by per option choosed string (default: o_<classname>_<ref type>_<guid> )
202            if ($item && $options->{childObj2string} && !(ref $_[1] eq "ARRAY") && !(ref $_[1] eq "HASH")) {
203              $item = childObj2string($item, $options->{childObj2string});
204            } else {
205              # ... expand structure recursively
206              $item = expand($_[1], $options);
207            }
208          # destroy item via seperate callback method (a POST) if requested          # destroy item via seperate callback method (a POST) if requested
209          #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};          #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
210                
# Line 170  sub expand { Line 213  sub expand {
213          #$item = deep_copy($_[1]);          #$item = deep_copy($_[1]);
214          $item = $_[1];          $item = $_[1];
215          # conversions/encodings          # conversions/encodings
216          $item = scalar2utf8($item) if ($item && $options->{utf8});          $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
217            $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
218        }        }
219        #$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)
220        $result->{$_[0]} = $item;               # use item in any case        $result->{$_[0]} = $item;               # use item in any case
221      }      }
222    
223      } else {
224        #die ("not a reference!");
225        $result = $obj;
226    
227    }    }
228    
229    # convert all values to utf8 (inside complex struct)    # convert all values to utf8 (inside complex struct)
230      # now done in core-item-callbacks via Greg London's "Iterate" from CPAN      # now done in core-item-callbacks via Greg London's "Iterate" from CPAN
231      # var2utf8($result) if ($options->{utf8});      # latin_to_utf8($result) if ($options->{utf8});
232    
233    # destroy persistent object from memory to be sure to get a fresh one next time    # destroy persistent object from memory to be sure to get a fresh one next time
234    #undef $obj if $options->{destroy};    #undef $obj if $options->{destroy};
# Line 193  sub expand { Line 241  sub expand {
241    
242    
243  my @indexstack;  my @indexstack;
244  sub var_traverse_mixin_update {  sub _var_traverse_mixin_update_old {
245    my $obj = shift;    my $obj = shift;
246    my $data = shift;    my $data = shift;
247    my $bool_recursion = shift;    my $bool_recursion = shift;
# Line 237  sub var_traverse_mixin_update { Line 285  sub var_traverse_mixin_update {
285    #return $result;    #return $result;
286  }  }
287    
288  sub object2hash {  sub merge_to {
289    my $object = shift;    _hash2object(@_);
290    my $options = shift;    # TODO:
291    #my $deref = var_deref($object);    # re-implement using CPAN's "Iterate".
   my $deref = expand($object, $options);  
   #var2utf8($deref) if ($options->{utf8});  
   return $deref;  
292  }  }
293    
294    
295  # todo: maybe do diff(s) here sometimes!?  # todo: maybe do diff(s) here sometimes!?
296  sub hash2object {  sub _hash2object {
297    my $object = shift;    my $object = shift;
298    my $data = shift;    my $data = shift;
299    my $options = shift;    my $options = shift;
# Line 256  sub hash2object { Line 302  sub hash2object {
302        
303    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
304    # this method corrects this    # this method corrects this
305    var_NumericalHashToArray($data) if ($options->{php});    numhash2list($data) if ($options->{php});
306    
307    # utf8-conversion/-encoding (essential for I18N)    # utf8-conversion/-encoding (essential for I18N)
308    var_utf2iso($data) if ($options->{utf8});    var_utf2iso($data) if ($options->{utf8});
# Line 268  sub hash2object { Line 314  sub hash2object {
314    #my $obj = $self->getObject($oid);    #my $obj = $self->getObject($oid);
315    
316    # mix changes into fresh object and save it back    # mix changes into fresh object and save it back
317    hash2object_traverse_mixin($object, $data, 0, $options);    _hash2object_traverse_mixin($object, $data, 0, $options);
318    
319    # done in core mixin function?    # done in core mixin function?
320    #$self->{storage}->update($obj);    #$self->{storage}->update($obj);
# Line 291  sub hash2object { Line 337  sub hash2object {
337  #my @indexstack;  #my @indexstack;
338    
339  # 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
340  sub hash2object_traverse_mixin {  sub _hash2object_traverse_mixin {
341    my $object = shift;    my $object = shift;
342    my $data = shift;    my $data = shift;
343    my $bool_recursion = shift;    my $bool_recursion = shift;
# Line 309  sub hash2object_traverse_mixin { Line 355  sub hash2object_traverse_mixin {
355    # what's exactly done here? hmmm.... it works ;)    # what's exactly done here? hmmm.... it works ;)
356    # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!    # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
357    # extend! check!    # extend! check!
358    if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {    
359      #print attributes::reftype($object), "\n";
360      
361      # V1
362      #if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
363      # V2
364      my $reftype = attributes::reftype($object);
365      #print "reftype: '$reftype'", "\n";
366      if ($reftype eq 'HASH') {
367    
368  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
369                    
# Line 329  sub hash2object_traverse_mixin { Line 383  sub hash2object_traverse_mixin {
383        my $ref = ref $object->{$field};        my $ref = ref $object->{$field};
384  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
385        if ($ref) {        if ($ref) {
386          hash2object_traverse_mixin($object->{$field}, $data, 1, $options);          _hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
387        } else {        } else {
388          my $val = getStructSlotByStringyAddress($data, \@indexstack);          my $val = ref_slot($data, \@indexstack);
389                    
390  print Dumper($options);  #print Dumper($options);
391          my $field_target = $field;          my $field_target = $field;
392          if (my $pattern = $options->{pattern_strip_key}) {          if (my $pattern = $options->{pattern_strip_key}) {
393            print "pattern: $pattern", "\n";            print "pattern: $pattern", "\n";
# Line 374  print Dumper($options); Line 428  print Dumper($options);
428  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
429  #      if ($ref && $_) {  #      if ($ref && $_) {
430        if ($ref) {        if ($ref) {
431          hash2object_traverse_mixin($_, $data, 1, $options);          _hash2object_traverse_mixin($_, $data, 1, $options);
432        } else {        } else {
433          $object->[$i] = $_ if defined $_;          $object->[$i] = $_ if defined $_;
434        }        }
435        pop @indexstack;        pop @indexstack;
436        $i++;        $i++;
437      }      }
   }  
   
 }  
   
   
 # 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";  
       }  
     }  
438    
439    =pod
440      # object?
441    } else {    } else {
442      # use expr as simple scalar key (attributename)      print "reference: ", ref $object, "\n";
443      $value = $obj->{$expr};      print "reftype: ", $reftype, "\n";
444    }      die(__PACKAGE__ . "->_hash2object_traverse_mixin: can not handle this!");
445              =cut
   return $value;  
446        
447  }    }
   
   
 sub refexpr2perlref_parts {  
   my $expr = shift;  
   
   # split expression by dereference operators first  
   my @parts_pure = split(/->/, $expr);  
   
   # wrap []'s around each part, if it consists of numeric characters only (=> numeric = array-index),  
   # use {}'s, if there are word-characters in it (=> alphanumeric = hash-key)  
   my @parts_capsule = @parts_pure;  
   map {  
     m/^\d+$/ && ($_ = "[$_]") || ($_ = "{$_}");  
   } @parts_capsule;  
448    
   # join parts with dereference operators together again and return built string  
   return (join('->', @parts_capsule), \@parts_pure);  
449  }  }
450    
451  # ACK's go to ...  
452  sub deep_copy {  # ACK's go to Randal L. Schwartz <merlyn@stonehenge.com>
453    # on the website:
454    # This text is copyright by Miller-Freeman, Inc., and is used with their permission.
455    # Further distribution or use is not permitted.
456    # please visit http://www.stonehenge.com/merlyn/UnixReview/col30.html
457    sub deep_copy1 {
458    my $this = shift;    my $this = shift;
459    if (not ref $this) {    if (not ref $this) {
460      $this;      $this;
461    } elsif (ref $this eq "ARRAY") {    } elsif (ref $this eq "ARRAY") {
462      [map deep_copy($_), @$this];      [map deep_copy1($_), @$this];
463    } elsif (ref $this eq "HASH") {    } elsif (ref $this eq "HASH") {
464      +{map { $_ => deep_copy($this->{$_}) } keys %$this};      +{map { $_ => deep_copy1($this->{$_}) } keys %$this};
465    } elsif (ref $this eq "CODE") {    } elsif (ref $this eq "CODE") {
466      $this;      $this;
467    #} else { die "deep_copy asks: what type is $this?" }    } else { die "deep_copy1 asks: what type is $this?" }
468    } else { print "deep_copy asks: what type is $this?", "\n"; }    #} else { print "deep_copy asks: what type is $this?", "\n"; }
469    }
470    
471    # ACK's go to Andrew Pitonyak
472    # Copyright 2002, Andrew Pitonyak (perlboy@pitonyak.org)
473    # please visit: http://www.pitonyak.org/code/perl/Pitonyak/DeepCopy.pm.html
474    sub deep_copy {
475      Pitonyak::DeepCopy::deep_copy(@_);
476  }  }
477    
478    
479    sub childObj2string {
480      my $obj = shift;
481      my $option = shift;
482      my $classname = ref $obj;
483      
484      if($option == 1) {
485        my $string = "o_" . $classname . "_" .$obj->{guid};
486        return $string;
487      }  
488    }
489    
490    
491  1;  1;
492    __END__
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