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############################################## |
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# |
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# $Id: Deep.pm,v 1.4 2002/12/05 13:56:49 joko Exp $ |
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# |
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# $Log: Deep.pm,v $ |
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# Revision 1.4 2002/12/05 13:56:49 joko |
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# - var_deref |
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# + expand - more sophisticated dereferencing with callbacks using Iterate |
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# |
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# Revision 1.3 2002/12/03 05:34:55 joko |
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# + bugfix: now utilizing var_utf2iso from Data::Transform::Encode |
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# |
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# Revision 1.2 2002/12/01 04:44:07 joko |
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# + code from Data::Transform::OO |
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# |
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# Revision 1.1 2002/11/29 04:49:20 joko |
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# + initial check-in |
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# |
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# Revision 1.1 2002/10/10 03:26:00 cvsjoko |
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# + new |
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# |
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############################################## |
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|
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|
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package Data::Transform::Deep; |
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|
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use strict; |
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use warnings; |
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|
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require Exporter; |
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our @ISA = qw( Exporter ); |
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our @EXPORT_OK = qw( |
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&var_NumericalHashToArray |
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&var_mixin |
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&object2hash |
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&hash2object |
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&refexpr2perlref |
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&expand |
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); |
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# &var_deref |
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# &getStructSlotByStringyAddress |
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|
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use attributes; |
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use Data::Dumper; |
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use Data::Transform::Encode qw( var_utf2iso var2utf8 scalar2utf8 ); |
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use libp qw( deep_copy ); |
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use Iterate; |
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|
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sub var_NumericalHashToArray { |
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my $vref = shift; |
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#my $context = shift; |
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if (ref $vref eq 'HASH') { |
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foreach (keys %{$vref}) { |
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# if ((ref $vref->{$_}) =~ m/HASH/) { |
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if ((ref $vref->{$_}) =~ m/HASH/) { |
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if ($vref->{$_}{0}) { # might be a numerical-indexed array |
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#print "000\n"; |
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#print "context: $context\n"; |
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my @arr; |
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foreach my $key_numeric (sort keys %{$vref->{$_}}) { |
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push @arr, $vref->{$_}{$key_numeric}; |
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} |
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$vref->{$_} = \@arr; |
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} |
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var_NumericalHashToArray($vref->{$_}); |
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} |
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# } else { |
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# #$vref->{$_} = scalar2iso($vref->{$_}); |
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# } |
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} |
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} |
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} |
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|
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|
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sub var_deref { |
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my $obj = shift; |
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my $options = shift; |
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my $result; |
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if ((ref $obj) eq 'ARRAY') { |
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foreach (@{$obj}) { |
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my $ref = ref $_; |
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if ($ref) { |
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push(@{$result}, var_deref($_, $options)); |
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#undef $_; |
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} else { |
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#push(@{$result}, $_); |
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push(@{$result}, deep_copy($_)); |
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} |
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#undef $_ if $options->{destroy}; |
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#$options->{destroy}->($_) if $options->{destroy}; |
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} |
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# TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }" ??? |
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} else { |
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foreach (keys %{$obj}) { |
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my $key = $_; |
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my $ref = ref $obj->{$_}; |
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if ($ref) { |
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$result->{$_} = var_deref($obj->{$_}, $options); |
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#undef $obj->{$_}; |
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} else { |
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#$result->{$_} = $obj->{$_}; |
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$result->{$_} = deep_copy($obj->{$_}); |
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} |
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#undef $obj->{$_} if $options->{destroy}; |
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#$options->{destroy}->($obj->{$_}) if $options->{destroy}; |
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} |
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} |
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#undef $obj if $options->{destroy}; |
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$options->{cb_destroy}->($obj) if $options->{cb_destroy}; |
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return $result; |
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} |
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|
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|
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sub expand { |
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|
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my $obj = shift; |
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my $options = shift; |
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my $result; |
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|
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if ((ref $obj) eq 'ARRAY') { |
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|
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IterArray @$obj, sub { |
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my $item; |
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# if current item is a reference ... |
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if (ref $_[0]) { |
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# ... expand structure recursively |
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$item = expand($_[0], $options); |
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# destroy item via seperate callback method (a POST) if requested |
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#$options->{cb}->{destroy}->($_[0]) if $options->{destroy}; |
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|
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# ... assume plain scalar |
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} else { |
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#$item = deep_copy($_[0]); |
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$item = $_[0]; |
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# conversions/encodings |
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$item = scalar2utf8($item) if ($item && $options->{utf8}); |
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} |
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#push(@{$result}, $item) if $item; # use item only if not undef (TODO: make configurable via $options) |
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push(@{$result}, $item); # use item in any case |
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|
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} |
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|
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# TODO: "} elsif (ref $obj eq 'HASH') { [...] } else { croak 'could not deref blah'; }" ??? |
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} else { |
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|
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IterHash %$obj, sub { |
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my $item; |
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|
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# if current item is a reference ... |
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if (ref $_[1]) { |
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# ... expand structure recursively |
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$item = expand($_[1], $options); |
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# destroy item via seperate callback method (a POST) if requested |
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#$options->{cb}->{destroy}->($_[1]) if $options->{destroy}; |
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|
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# ... assume plain scalar |
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} else { |
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#$item = deep_copy($_[1]); |
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$item = $_[1]; |
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# conversions/encodings |
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$item = scalar2utf8($item) if ($item && $options->{utf8}); |
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} |
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#$result->{$_[0]} = $item if $item; # use item only if not undef (TODO: make configurable via $options) |
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$result->{$_[0]} = $item; # use item in any case |
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} |
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|
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} |
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|
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# convert all values to utf8 (inside complex struct) |
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# now done in core-item-callbacks via Greg London's "Iterate" from CPAN |
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# var2utf8($result) if ($options->{utf8}); |
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|
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# destroy persistent object from memory to be sure to get a fresh one next time |
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#undef $obj if $options->{destroy}; |
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#$options->{cb_destroy}->($obj) if $options->{cb_destroy}; |
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#$options->{cb}->{destroy}->($obj) if $options->{destroy}; |
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|
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return $result; |
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} |
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|
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|
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|
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my @indexstack; |
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sub var_traverse_mixin_update { |
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my $obj = shift; |
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my $data = shift; |
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my $bool_recursion = shift; |
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if (!$bool_recursion) { |
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@indexstack = (); |
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} |
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my $result; |
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|
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# 'ARRAY' does not work! |
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if ((ref $obj) eq 'ARRAY') { |
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#print "ARRAY\n"; |
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my $i = 0; |
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foreach (@{$obj}) { |
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push @indexstack, $i; |
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my $ref = ref $_; |
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if ($ref) { |
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#$obj->[$i] = var_mixin($_, $data, 1); |
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var_traverse_mixin_update($_, $data, 1); |
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} else { |
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$obj->[$i] = $_; |
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} |
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pop @indexstack; |
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$i++; |
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} |
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} else { |
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foreach (keys %{$obj}) { |
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push @indexstack, $_; |
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my $ref = ref $obj->{$_}; |
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if ($ref) { |
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#$obj->{$_} = var_mixin($obj->{$_}, $data, 1); |
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var_traverse_mixin_update($obj->{$_}, $data, 1); |
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} else { |
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#$obj->{$_} = $obj->{$_}; |
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my $evstring = getSlot($data); |
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$obj->{$_} = $evstring; |
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|
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} |
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pop @indexstack; |
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} |
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} |
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#return $result; |
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} |
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|
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sub object2hash { |
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my $object = shift; |
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my $options = shift; |
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#my $deref = var_deref($object); |
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my $deref = expand($object, $options); |
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#var2utf8($deref) if ($options->{utf8}); |
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return $deref; |
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} |
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|
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# todo: maybe do diff(s) here sometimes!? |
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sub hash2object { |
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my $object = shift; |
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my $data = shift; |
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my $options = shift; |
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|
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#print "hash2object", "\n"; |
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|
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# "patch" needed 'cause php passes numerical-indexed-arrays as hash-tables, |
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# this method corrects this |
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var_NumericalHashToArray($data) if ($options->{php}); |
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|
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# utf8-conversion/-encoding (essential for I18N) |
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var_utf2iso($data) if ($options->{utf8}); |
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|
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# get fresh object from database |
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# todo: |
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# - handle "locked" objects !!! |
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# - check if already another update occoured (object-revisioning needed!) |
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#my $obj = $self->getObject($oid); |
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|
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# mix changes into fresh object and save it back |
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hash2object_traverse_mixin($object, $data, 0, $options); |
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|
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# done in core mixin function? |
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#$self->{storage}->update($obj); |
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|
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# we should "undef" some objects here to destroy them in memory and enforce reloading when used next time |
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# simulate: |
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#$self->{storage}->disconnect(); |
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|
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} |
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|
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# ------------------------------------ |
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# core mixin function |
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# TODO-FEATURE: make this possible in a reverse way: object is empty (no fields) and gets filled up by mixin-data |
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|
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# remember keys of structures we are traversing |
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# this is a HACK: |
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# - don't (!!!) "packageglobal" @indexstack |
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# - it will lead to problems with parallelism! |
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|
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#my @indexstack; |
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|
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# traverse a deeply nested structure, mix in values from given hash, update underlying tangram-object |
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sub hash2object_traverse_mixin { |
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my $object = shift; |
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my $data = shift; |
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my $bool_recursion = shift; |
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my $options = shift; |
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|
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# clear our key - stack if we are called from user-code (non-recursively) |
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@indexstack = () if (!$bool_recursion); |
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|
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my $classname = ref $object; |
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# if ($classname) { |
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# print STDERR "*****************", Dumper(Class::Tangram::attribute_types($classname)), "\n"; |
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# } |
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|
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# parser: detected OBJECT (a Tangram one?) (reftype == HASH) (assume) |
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# what's exactly done here? hmmm.... it works ;) |
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# maybe a HACK: please try not to use "IntrHash"es, maybe this cannot handle them!!! |
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# extend! check! |
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if ((attributes::reftype($object) eq 'HASH') && (ref($object) ne 'HASH') && (ref($object) ne 'ARRAY')) { |
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|
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# print STDERR "===", "reftype: ", attributes::reftype($obj), "\n"; |
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|
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my @fields; |
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# loop through fields of object (Tangram-object) |
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@fields = keys %{$object}; |
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|
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# loop through fields of to.be.injected-data (arbitrary Perl-data-structure) |
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@fields = keys %{$data} if $options->{init}; |
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|
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foreach (@fields) { |
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push @indexstack, $_; |
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|
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# determine type of object |
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my $ref = ref $object->{$_}; |
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# print STDERR "attrname: $_ ATTRref: $ref", "\n"; |
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if ($ref) { |
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hash2object_traverse_mixin($object->{$_}, $data, 1, $options); |
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} else { |
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my $val = getStructSlotByStringyAddress($data, \@indexstack); |
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$object->{$_} = $val; |
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} |
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pop @indexstack; |
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} |
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|
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# save object to database ... |
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# ... do an update if it already exists, do an insert if it doesn't |
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# my $objectId = $self->{storage}->id($obj); |
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# $logger->debug( __PACKAGE__ . "->saveObjectFromHash_traverse_mixin_update( object $obj objectId $objectId )" ); |
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# if ($objectId) { |
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# $self->{storage}->update($obj); |
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|
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#print __PACKAGE__ . ":", "\n"; |
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#print Dumper($object); |
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|
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# } else { |
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# $self->{storage}->insert($obj); |
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# } |
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|
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} |
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|
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#&& ( ref($obj) ne 'HASH' ) |
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|
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# loop through entries of array (IntrArray, isn't it?) |
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if ((ref $object) eq 'ARRAY') { |
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# print STDERR "===", "refttype ", attributes::reftype($obj), "\n"; |
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my $i = 0; |
| 348 |
foreach (@{$object}) { |
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push @indexstack, $i; |
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my $ref = ref $_; |
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# print STDERR "attrname: $_ ATTRref: $ref", "\n"; |
| 352 |
if ($ref && $_) { |
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hash2object_traverse_mixin($_, $data, 1, $options); |
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} else { |
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$object->[$i] = $_; |
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} |
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pop @indexstack; |
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$i++; |
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} |
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} |
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|
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} |
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|
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|
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# this function seems to do similar stuff like these below (refexpr2perlref & co.) |
| 366 |
# TODO: maybe this mechanism can be replaced completely through some nice module from CPAN .... ? ;-) |
| 367 |
sub getStructSlotByStringyAddress { |
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my $var = shift; |
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my $indexstack_ref = shift; |
| 370 |
my @indexstack = @{$indexstack_ref}; |
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my $joiner = '->'; |
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my @evlist; |
| 373 |
foreach (@indexstack) { |
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my $elem; |
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if ($_ =~ m/\d+/) { $elem = "[$_]"; } |
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if ($_ =~ m/\D+/) { $elem = "{$_}"; } |
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push @evlist, $elem; |
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} |
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my $evstring = join($joiner, @evlist); |
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$evstring = 'return $var->' . $evstring . ';'; |
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#print "ev: $evstring\n"; |
| 382 |
return eval($evstring); |
| 383 |
} |
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|
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|
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sub refexpr2perlref { |
| 387 |
|
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my $obj = shift; |
| 389 |
my $expr = shift; |
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my $callbackMap = shift; |
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|
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my $value; |
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# detect for callback (code-reference) |
| 394 |
if (ref($expr) eq 'CODE') { |
| 395 |
$value = &$expr($obj); |
| 396 |
|
| 397 |
} elsif ($expr =~ m/->/) { |
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# use expr as complex object reference declaration (obj->subObj->subSubObj->0->attribute) |
| 399 |
(my $objPerlRefString, my $parts) = refexpr2perlref_parts($expr); |
| 400 |
#print "\n", "expr: $expr"; |
| 401 |
#print "\n", "objPerlRefString: $objPerlRefString"; |
| 402 |
$value = eval('$obj' . '->' . $objPerlRefString); |
| 403 |
|
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# if value isn't set, try to "fallback" to callbackMap |
| 405 |
# callbacks are applied this way: |
| 406 |
# take the last element of the expression parts and check if this string exists as a key in the callback-map |
| 407 |
if (!$value && $callbackMap) { |
| 408 |
#print Dumper($callbackMap); |
| 409 |
|
| 410 |
# prepare needle |
| 411 |
my @parts = @$parts; |
| 412 |
my $count = $#parts; |
| 413 |
my $needle = $parts[$count]; |
| 414 |
|
| 415 |
# prepare haystack |
| 416 |
my @haystack = keys %$callbackMap; |
| 417 |
if (grep($needle, @haystack)) { |
| 418 |
$value = $callbackMap->{$needle}->(); |
| 419 |
#print "value: ", $value, "\n"; |
| 420 |
} |
| 421 |
} |
| 422 |
|
| 423 |
} else { |
| 424 |
# use expr as simple scalar key (attributename) |
| 425 |
$value = $obj->{$expr}; |
| 426 |
} |
| 427 |
|
| 428 |
return $value; |
| 429 |
|
| 430 |
} |
| 431 |
|
| 432 |
|
| 433 |
sub refexpr2perlref_parts { |
| 434 |
my $expr = shift; |
| 435 |
|
| 436 |
# split expression by dereference operators first |
| 437 |
my @parts_pure = split(/->/, $expr); |
| 438 |
|
| 439 |
# wrap []'s around each part, if it consists of numeric characters only (=> numeric = array-index), |
| 440 |
# use {}'s, if there are word-characters in it (=> alphanumeric = hash-key) |
| 441 |
my @parts_capsule = @parts_pure; |
| 442 |
map { |
| 443 |
m/^\d+$/ && ($_ = "[$_]") || ($_ = "{$_}"); |
| 444 |
} @parts_capsule; |
| 445 |
|
| 446 |
# join parts with dereference operators together again and return built string |
| 447 |
return (join('->', @parts_capsule), \@parts_pure); |
| 448 |
} |
| 449 |
|
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