/[cvs]/nfo/perl/libs/Data/Mungle/Transform/Deep.pm

Diff of /nfo/perl/libs/Data/Mungle/Transform/Deep.pm

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-revision 1.4 by joko,
Thu Dec  5 13:56:49 2002 UTC
+revision 1.15 by jonen,
Thu Feb 27 14:39:48 2003 UTC
 Line 1
- ##############################################
+ ## ---------------------------------------------------------------------------
- #
+ ##  $Id$
- #  $Id$
+ ## ---------------------------------------------------------------------------
- #
+ ##  $Log$
- #  $Log$
+ ##  Revision 1.15  2003/02/27 14:39:48  jonen
- #  Revision 1.4  2002/12/05 13:56:49  joko
+ ##  + fixed bug at _hash2object()
- #  - var_deref
+ ##
- #  + expand - more sophisticated dereferencing with callbacks using Iterate
+ ##  Revision 1.14  2003/02/22 17:13:55  jonen
- #
+ ##  + added function 'childObject2string()' to encode 'child'-references to option related string
- #  Revision 1.3  2002/12/03 05:34:55  joko
+ ##  + use new option at 'expand()' for replacing 'childObject2string'
- #  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
+ ##
- #
+ ##  Revision 1.13  2003/02/21 01:48:50  joko
- #  Revision 1.2  2002/12/01 04:44:07  joko
+ ##  renamed core function
- #  + code from Data::Transform::OO
+ ##
- #
+ ##  Revision 1.12  2003/02/20 22:45:19  joko
- #  Revision 1.1  2002/11/29 04:49:20  joko
+ ##  fix regarding new deep_copy
- #  + initial check-in
+ ##
- #
+ ##  Revision 1.11  2003/02/20 21:13:54  joko
- #  Revision 1.1  2002/10/10 03:26:00  cvsjoko
+ ##  - removed implementation of deep_copy2 - get this from the Pitonyak namespace (now cloned to repository)
- #  + new
+ ##
- #
+ ##  Revision 1.10  2003/02/20 20:48:00  joko
- ##############################################
+ ##  - refactored lots of code to Data::Code::Ref
+ ##  + alternative 'deep_copy' implementation
+ ##
+ ##  Revision 1.9  2003/02/18 19:35:56  joko
+ ##  +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
+ ##
+ ##  Revision 1.8  2003/02/09 05:10:56  joko
+ ##  + minor update
+ ##
+ ##  Revision 1.7  2003/01/19 03:26:59  joko
+ ##  + added 'sub deep_copy'  -  refactored from libp
+ ##  + add 'sub merge'  -  exported from CPAN's 'Hash::Merge'
+ ##
+ ##  Revision 1.6  2002/12/23 11:27:53  jonen
+ ##  + changed behavior WATCH!
+ ##
+ ##  Revision 1.5  2002/12/16 19:57:54  joko
+ ##  + option 'init'
+ ##
+ ##  Revision 1.4  2002/12/05 13:56:49  joko
+ ##  - var_deref
+ ##  + expand - more sophisticated dereferencing with callbacks using Iterate
+ ##
+ ##  Revision 1.3  2002/12/03 05:34:55  joko
+ ##  + bugfix: now utilizing var_utf2iso from Data::Transform::Encode
+ ##
+ ##  Revision 1.2  2002/12/01 04:44:07  joko
+ ##  + code from Data::Transform::OO
+ ##
+ ##  Revision 1.1  2002/11/29 04:49:20  joko
+ ##  + initial check-in
+ ##
+ ##  Revision 1.1  2002/10/10 03:26:00  cvsjoko
+ ##  + new
+ ## ---------------------------------------------------------------------------
  package Data::Transform::Deep;
-Line 30 
 use warnings;
+Line 64 
 use warnings;
  require Exporter;
  our @ISA = qw( Exporter );
  our @EXPORT_OK = qw(
-   &var_NumericalHashToArray
-   &var_mixin
-   &object2hash
-   &hash2object
-   &refexpr2perlref
    &expand
+   &deep_copy
+   &merge_to
  );
- #  &var_deref
- #  &getStructSlotByStringyAddress
  use attributes;
  use Data::Dumper;
- use Data::Transform::Encode qw( var_utf2iso var2utf8 scalar2utf8 );
- use libp qw( deep_copy );
  use Iterate;
- sub var_NumericalHashToArray {
+ use Pitonyak::DeepCopy;
+ use Data::Transform::Encode qw( latin_to_utf8 latin_to_utf8_scalar utf8_to_latin utf8_to_latin_scalar );
+ use Data::Code::Ref qw( ref_slot );
+ sub numhash2list {
    my $vref = shift;
    #my $context = shift;
    if (ref $vref eq 'HASH') {
-Line 62 
 sub var_NumericalHashToArray {
+Line 94 
 sub var_NumericalHashToArray {
                }
                $vref->{$_} = \@arr;
              }
-             var_NumericalHashToArray($vref->{$_});
+             numhash2list($vref->{$_});
            }
  #      } else {
  #        #$vref->{$_} = scalar2iso($vref->{$_});
-Line 72 
 sub var_NumericalHashToArray {
+Line 104 
 sub var_NumericalHashToArray {
  }
- sub var_deref {
+ # FIXME: could this be refactored using expand?
+ # btw: "expand": look at scripts@CPAN (System Administration):
+ # there is a perl make with perl
+ sub _var_deref_test {
    my $obj = shift;
    my $options = shift;
    my $result;
-Line 111 
 sub var_deref {
+Line 146 
 sub var_deref {
  }
+ # convert values in hash to utf8 (and back) to be ready for (e.g.) encapsulation in XML
+ # but still using the known latin locale stuff
  sub expand {
    my $obj = shift;
    my $options = shift;
    my $result;
-   if ((ref $obj) eq 'ARRAY') {
+   #print "ref: ", ref $obj, "\n";
+   if (ref $obj eq 'ARRAY') {
      IterArray @$obj, sub {
        my $item;
        # if current item is a reference ...
        if (ref $_[0]) {
-         # ... expand structure recursively
+         $item = $_[0];
-         $item = expand($_[0], $options);
+         # if $options->{childObj2string} is TRUE or STRING don't expand referenced object,
+         # instead replace it by per option choosed string (default: o_<classname>_<ref type>_<guid> )
+         if ($item && $options->{childObj2string}) {
+           $item = childObj2string($item, $options->{childObj2string});
+         } else {
+           # ... expand structure recursively
+           $item = expand($_[0], $options);
+         }
          # destroy item via seperate callback method (a POST) if requested
          #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};
-Line 133 
 sub expand {
+Line 179 
 sub expand {
          #$item = deep_copy($_[0]);
          $item = $_[0];
          # conversions/encodings
-         $item = scalar2utf8($item) if ($item && $options->{utf8});
+         $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
+         $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
        }
        #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)
        push(@{$result}, $item);                 # use item in any case
      }
+   } elsif (ref $obj eq 'CODE') {
+     #print Dumper($obj);
+     #exit;
    # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
-   } else {
+   } elsif (ref $obj) {
      IterHash %$obj, sub {
        my $item;
        # if current item is a reference ...
        if (ref $_[1]) {
-         # ... expand structure recursively
+         $item = $_[1];
-         $item = expand($_[1], $options);
+         # if $options->{childObj2string} is TRUE or STRING don't expand referenced object,
+         # instead replace it by per option choosed string (default: o_<classname>_<ref type>_<guid> )
+         if ($item && $options->{childObj2string} && !(ref $_[1] eq "ARRAY") && !(ref $_[1] eq "HASH")) {
+           $item = childObj2string($item, $options->{childObj2string});
+         } else {
+           # ... expand structure recursively
+           $item = expand($_[1], $options);
+         }
          # destroy item via seperate callback method (a POST) if requested
          #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
-Line 158 
 sub expand {
+Line 216 
 sub expand {
          #$item = deep_copy($_[1]);
          $item = $_[1];
          # conversions/encodings
-         $item = scalar2utf8($item) if ($item && $options->{utf8});
+         $item = latin_to_utf8_scalar($item) if ($item && $options->{utf8});
+         $item = utf8_to_latin_scalar($item) if ($item && $options->{to_latin});
        }
        #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)
        $result->{$_[0]} = $item;               # use item in any case
      }
+   } else {
+     #die ("not a reference!");
+     $result = $obj;
    }
    # convert all values to utf8 (inside complex struct)
      # now done in core-item-callbacks via Greg London's "Iterate" from CPAN
-     # var2utf8($result) if ($options->{utf8});
+     # latin_to_utf8($result) if ($options->{utf8});
    # destroy persistent object from memory to be sure to get a fresh one next time
    #undef $obj if $options->{destroy};
-Line 181 
 sub expand {
+Line 244 
 sub expand {
  my @indexstack;
- sub var_traverse_mixin_update {
+ sub _var_traverse_mixin_update_old {
    my $obj = shift;
    my $data = shift;
    my $bool_recursion = shift;
-Line 225 
 sub var_traverse_mixin_update {
+Line 288 
 sub var_traverse_mixin_update {
    #return $result;
  }
- sub object2hash {
+ sub merge_to {
-   my $object = shift;
+   _hash2object(@_);
-   my $options = shift;
+   # TODO:
-   #my $deref = var_deref($object);
+   # re-implement using CPAN's "Iterate".
-   my $deref = expand($object, $options);
-   #var2utf8($deref) if ($options->{utf8});
-   return $deref;
  }
  # todo: maybe do diff(s) here sometimes!?
- sub hash2object {
+ sub _hash2object {
    my $object = shift;
    my $data = shift;
    my $options = shift;
-Line 244 
 sub hash2object {
+Line 305 
 sub hash2object {
    # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
    # this method corrects this
-   var_NumericalHashToArray($data) if ($options->{php});
+   numhash2list($data) if ($options->{php});
    # utf8-conversion/-encoding (essential for I18N)
-   var_utf2iso($data) if ($options->{utf8});
+   utf8_to_latin($data) if ($options->{utf8});
    # get fresh object from database
    # todo:
-Line 256 
 sub hash2object {
+Line 317 
 sub hash2object {
    #my $obj = $self->getObject($oid);
    # mix changes into fresh object and save it back
-   hash2object_traverse_mixin($object, $data);
+   _hash2object_traverse_mixin($object, $data, 0, $options);
    # done in core mixin function?
    #$self->{storage}->update($obj);
-Line 279 
 sub hash2object {
+Line 340 
 sub hash2object {
  #my @indexstack;
  # traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object
- sub hash2object_traverse_mixin {
+ sub _hash2object_traverse_mixin {
    my $object = shift;
    my $data = shift;
    my $bool_recursion = shift;
+   my $options = shift;
    # clear our key - stack if we are called from user-code (non-recursively)
    @indexstack = () if (!$bool_recursion);
-Line 296 
 sub hash2object_traverse_mixin {
+Line 358 
 sub hash2object_traverse_mixin {
    # what's exactly done here? hmmm.... it works ;)
    # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
    # extend! check!
-   if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
+   #print attributes::reftype($object), "\n";
+   # V1
+   #if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
+   # V2
+   my $reftype = attributes::reftype($object);
+   #print "reftype: '$reftype'", "\n";
+   if ($reftype eq 'HASH') {
  #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
+     my @fields;
      # loop through fields of object (Tangram-object)
-     foreach (keys %{$object}) {
+     @fields = keys %{$object};
-       push @indexstack, $_;
+     # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
+     @fields = keys %{$data} if $options->{init};
+ #    @fields = keys %{$data} if $options->{mixin};
+     foreach (@fields) {
+       my $field = $_;
+       push @indexstack, $field;
        # determine type of object
-       my $ref = ref $object->{$_};
+       my $ref = ref $object->{$field};
  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
        if ($ref) {
-         hash2object_traverse_mixin($object->{$_}, $data, 1);
+         _hash2object_traverse_mixin($object->{$field}, $data, 1, $options);
        } else {
-         my $val = getStructSlotByStringyAddress($data, \@indexstack);
+         my $val = ref_slot($data, \@indexstack);
-         $object->{$_} = $val;
+ #print Dumper($options);
+         my $field_target = $field;
+         if (my $pattern = $options->{pattern_strip_key}) {
+           print "pattern: $pattern", "\n";
+           $field_target =~ s/$pattern//;
+           print "field: $field_target", "\n";
+         }
+         $object->{$field_target} = $val if defined $val;
        }
        pop @indexstack;
      }
-Line 342 
 sub hash2object_traverse_mixin {
+Line 429 
 sub hash2object_traverse_mixin {
        push @indexstack, $i;
        my $ref = ref $_;
  #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
-       if ($ref && $_) {
+ #      if ($ref && $_) {
-         hash2object_traverse_mixin($_, $data, 1);
+       if ($ref) {
+         _hash2object_traverse_mixin($_, $data, 1, $options);
        } else {
-         $object->[$i] = $_;
+         $object->[$i] = $_ if defined $_;
        }
        pop @indexstack;
        $i++;
      }
+ =pod
+   # object?
+   } else {
+     print "reference: ", ref $object, "\n";
+     print "reftype: ", $reftype, "\n";
+     die(__PACKAGE__ . "->_hash2object_traverse_mixin: can not handle this!");
+ =cut
    }
  }
- # this function seems to do similar stuff like these below (refexpr2perlref & co.)
+ # ACK's go to Randal L. Schwartz <merlyn@stonehenge.com>
- sub getStructSlotByStringyAddress {
+ # on the website:
-   my $var = shift;
+ # This text is copyright by Miller-Freeman, Inc., and is used with their permission.
-   my $indexstack_ref = shift;
+ # Further distribution or use is not permitted.
-   my @indexstack = @{$indexstack_ref};
+ # please visit http://www.stonehenge.com/merlyn/UnixReview/col30.html
-   my $joiner = '->';
+ sub deep_copy1 {
-   my @evlist;
+   my $this = shift;
-   foreach (@indexstack) {
+   if (not ref $this) {
-     my $elem;
+     $this;
-     if ($_ =~ m/\d+/) { $elem = "[$_]"; }
+   } elsif (ref $this eq "ARRAY") {
-     if ($_ =~ m/\D+/) { $elem = "{$_}"; }
+     [map deep_copy1($_), @$this];
-     push @evlist, $elem;
+   } elsif (ref $this eq "HASH") {
-   }
+     +{map { $_ => deep_copy1($this->{$_}) } keys %$this};
-   my $evstring = join($joiner, @evlist);
+   } elsif (ref $this eq "CODE") {
-   $evstring = 'return $var->' . $evstring . ';';
+     $this;
-   #print "ev: $evstring\n";
+   } else { die "deep_copy1 asks: what type is $this?" }
-   return eval($evstring);
+   #} else { print "deep_copy asks: what type is $this?", "\n"; }
  }
+ # ACK's go to Andrew Pitonyak
+ # Copyright 2002, Andrew Pitonyak (perlboy@pitonyak.org)
+ # please visit: http://www.pitonyak.org/code/perl/Pitonyak/DeepCopy.pm.html
+ sub deep_copy {
+   Pitonyak::DeepCopy::deep_copy(@_);
+ }
- sub refexpr2perlref {
+ sub childObj2string {
    my $obj = shift;
-   my $expr = shift;
+   my $option = shift;
-   my $callbackMap = shift;
+   my $classname = ref $obj;
-   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";
-       }
-     }
-   } else {
-     # use expr as simple scalar key (attributename)
-     $value = $obj->{$expr};
-   }
-   return $value;
+   if($option == 1) {
+     my $string = "o_" . $classname . "_" .$obj->{guid};
+     return $string;
+   }
  }
- 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;
-   # join parts with dereference operators together again and return built string
-   return (join('->', @parts_capsule), \@parts_pure);
- }
 ;
+ __END__

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