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

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

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-revision 1.1 by joko,
Fri Nov 29 04:49:20 2002 UTC
+revision 1.5 by joko,
Mon Dec 16 19:57:54 2002 UTC
 Line 3
  #  $Id$
  #
  #  $Log$
+ #  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
  #
-Line 19 
 use warnings;
+Line 32 
 use warnings;
  require Exporter;
  our @ISA = qw( Exporter );
  our @EXPORT_OK = qw(
    &var_NumericalHashToArray
-   &var_deref
+   &var_mixin
-   &var_mixin
+   &object2hash
-   &getStructSlotByStringyAddress
+   &hash2object
+   &refexpr2perlref
+   &expand
  );
+ #  &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 {
    my $vref = shift;
-Line 57 
 sub var_NumericalHashToArray {
+Line 77 
 sub var_NumericalHashToArray {
  sub var_deref {
    my $obj = shift;
+   my $options = shift;
    my $result;
    if ((ref $obj) eq 'ARRAY') {
      foreach (@{$obj}) {
        my $ref = ref $_;
        if ($ref) {
-         push(@{$result}, var_deref($_));
+         push(@{$result}, var_deref($_, $options));
+         #undef $_;
        } else {
-         push(@{$result}, $_);
+         #push(@{$result}, $_);
+         push(@{$result}, deep_copy($_));
        }
+       #undef $_ if $options->{destroy};
+       #$options->{destroy}->($_) if $options->{destroy};
      }
+   # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
    } else {
      foreach (keys %{$obj}) {
        my $key = $_;
        my $ref = ref $obj->{$_};
        if ($ref) {
-         $result->{$_} = var_deref($obj->{$_});
+         $result->{$_} = var_deref($obj->{$_}, $options);
+         #undef $obj->{$_};
        } else {
-         $result->{$_} = $obj->{$_};
+         #$result->{$_} = $obj->{$_};
+         $result->{$_} = deep_copy($obj->{$_});
        }
+       #undef $obj->{$_} if $options->{destroy};
+       #$options->{destroy}->($obj->{$_}) if $options->{destroy};
      }
    }
+   #undef $obj if $options->{destroy};
+   $options->{cb_destroy}->($obj) if $options->{cb_destroy};
    return $result;
  }
+ sub expand {
+   my $obj = shift;
+   my $options = shift;
+   my $result;
+   if ((ref $obj) eq 'ARRAY') {
+     IterArray @$obj, sub {
+       my $item;
+       # if current item is a reference ...
+       if (ref $_[0]) {
+         # ... expand structure recursively
+         $item = expand($_[0], $options);
+         # destroy item via seperate callback method (a POST) if requested
+         #$options->{cb}->{destroy}->($_[0]) if $options->{destroy};
+       # ... assume plain scalar
+       } else {
+         #$item = deep_copy($_[0]);
+         $item = $_[0];
+         # conversions/encodings
+         $item = scalar2utf8($item) if ($item && $options->{utf8});
+       }
+       #push(@{$result}, $item) if $item;   # use item only if not undef  (TODO: make configurable via $options)
+       push(@{$result}, $item);                 # use item in any case
+     }
+   # TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }"  ???
+   } else {
+     IterHash %$obj, sub {
+       my $item;
+       # if current item is a reference ...
+       if (ref $_[1]) {
+         # ... expand structure recursively
+         $item = expand($_[1], $options);
+         # destroy item via seperate callback method (a POST) if requested
+         #$options->{cb}->{destroy}->($_[1]) if $options->{destroy};
+       # ... assume plain scalar
+       } else {
+         #$item = deep_copy($_[1]);
+         $item = $_[1];
+         # conversions/encodings
+         $item = scalar2utf8($item) if ($item && $options->{utf8});
+       }
+       #$result->{$_[0]} = $item if $item;   # use item only if not undef  (TODO: make configurable via $options)
+       $result->{$_[0]} = $item;               # use item in any case
+     }
+   }
+   # convert all values to utf8 (inside complex struct)
+     # now done in core-item-callbacks via Greg London's "Iterate" from CPAN
+     # var2utf8($result) if ($options->{utf8});
+   # destroy persistent object from memory to be sure to get a fresh one next time
+   #undef $obj if $options->{destroy};
+   #$options->{cb_destroy}->($obj) if $options->{cb_destroy};
+   #$options->{cb}->{destroy}->($obj) if $options->{destroy};
+   return $result;
+ }
  my @indexstack;
-Line 129 
 sub var_traverse_mixin_update {
+Line 228 
 sub var_traverse_mixin_update {
    #return $result;
  }
+ sub object2hash {
+   my $object = shift;
+   my $options = shift;
+   #my $deref = var_deref($object);
+   my $deref = expand($object, $options);
+   #var2utf8($deref) if ($options->{utf8});
+   return $deref;
+ }
+ # todo: maybe do diff(s) here sometimes!?
+ sub hash2object {
+   my $object = shift;
+   my $data = shift;
+   my $options = shift;
+   #print "hash2object", "\n";
+   # "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables,
+   # this method corrects this
+   var_NumericalHashToArray($data) if ($options->{php});
+   # utf8-conversion/-encoding (essential for I18N)
+   var_utf2iso($data) if ($options->{utf8});
+   # get fresh object from database
+   # todo:
+   #   - handle "locked" objects !!!
+   #   - check if already another update occoured (object-revisioning needed!)
+   #my $obj = $self->getObject($oid);
+   # mix changes into fresh object and save it back
+   hash2object_traverse_mixin($object, $data, 0, $options);
+   # done in core mixin function?
+   #$self->{storage}->update($obj);
+   # we should "undef" some objects here to destroy them in memory and enforce reloading when used next time
+   # simulate:
+   #$self->{storage}->disconnect();
+ }
+ # ------------------------------------
+ #   core mixin function
+ # TODO-FEATURE: make this possible in a reverse way: object is empty (no fields) and gets filled up by mixin-data
+ # remember keys of structures we are traversing
+ # this is a HACK:
+ #  - don't (!!!) "packageglobal" @indexstack
+ #  - it will lead to problems with parallelism!
+ #my @indexstack;
+ # traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object
+ 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);
+   my $classname = ref $object;
+ #  if ($classname) {
+ #    print STDERR "*****************", Dumper(Class::Tangram::attribute_types($classname)), "\n";
+ #  }
+   # parser: detected OBJECT (a Tangram one?)   (reftype == HASH) (assume)
+   # what's exactly done here? hmmm.... it works ;)
+   # maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!!
+   # extend! check!
+   if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) {
+ #    print STDERR "===", "reftype: ", attributes::reftype($obj), "\n";
+     my @fields;
+     # loop through fields of object (Tangram-object)
+     @fields = keys %{$object};
+     # loop through fields of to.be.injected-data (arbitrary Perl-data-structure)
+     @fields = keys %{$data} if $options->{init};
+     foreach (@fields) {
+       push @indexstack, $_;
+       # determine type of object
+       my $ref = ref $object->{$_};
+ #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
+       if ($ref) {
+         hash2object_traverse_mixin($object->{$_}, $data, 1, $options);
+       } else {
+         my $val = getStructSlotByStringyAddress($data, \@indexstack);
+         $object->{$_} = $val;
+       }
+       pop @indexstack;
+     }
+     # save object to database ...
+     # ... do an update if it already exists, do an insert if it doesn't
+ #    my $objectId = $self->{storage}->id($obj);
+ #    $logger->debug( __PACKAGE__ . "->saveObjectFromHash_traverse_mixin_update( object $obj objectId $objectId )" );
+ #    if ($objectId) {
+ #      $self->{storage}->update($obj);
+ #print __PACKAGE__ . ":", "\n";
+ #print Dumper($object);
+ #    } else {
+ #      $self->{storage}->insert($obj);
+ #    }
+   }
+ #&& ( ref($obj) ne 'HASH' )
+     # loop through entries of array (IntrArray, isn't it?)
+   if ((ref $object) eq 'ARRAY') {
+ #    print STDERR "===", "refttype ", attributes::reftype($obj), "\n";
+     my $i = 0;
+     foreach (@{$object}) {
+       push @indexstack, $i;
+       my $ref = ref $_;
+ #      print STDERR "attrname: $_  ATTRref: $ref", "\n";
+       if ($ref && $_) {
+         hash2object_traverse_mixin($_, $data, 1, $options);
+       } else {
+         $object->[$i] = $_;
+       }
+       pop @indexstack;
+       $i++;
+     }
+   }
+ }
+ # 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 $indexstack_ref = shift;
-Line 147 
 sub getStructSlotByStringyAddress {
+Line 385 
 sub getStructSlotByStringyAddress {
    return eval($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";
+       }
+     }
+   } else {
+     # use expr as simple scalar key (attributename)
+     $value = $obj->{$expr};
+   }
+   return $value;
+ }
+ 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);
+ }
 ;

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