/[cvs]/nfo/perl/libs/Data/Mungle/Transform/Deep.pm
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revision 1.8 by joko, Sun Feb 9 05:10:56 2003 UTC revision 1.9 by joko, Tue Feb 18 19:35:56 2003 UTC
# Line 2  Line 2 
2  ##  $Id$  ##  $Id$
3  ## ---------------------------------------------------------------------------  ## ---------------------------------------------------------------------------
4  ##  $Log$  ##  $Log$
5    ##  Revision 1.9  2003/02/18 19:35:56  joko
6    ##  +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too
7    ##
8  ##  Revision 1.8  2003/02/09 05:10:56  joko  ##  Revision 1.8  2003/02/09 05:10:56  joko
9  ##  + minor update  ##  + minor update
10  ##  ##
# Line 86  sub var_NumericalHashToArray { Line 89  sub var_NumericalHashToArray {
89  }  }
90    
91    
92    # FIXME: could this be refactored using expand?
93    # btw: "expand": look at scripts@CPAN (System Administration):
94    # there is a perl make with perl
95  sub var_deref {  sub var_deref {
96    my $obj = shift;    my $obj = shift;
97    my $options = shift;    my $options = shift;
# Line 413  sub refexpr2perlref { Line 419  sub refexpr2perlref {
419    
420    my $obj = shift;    my $obj = shift;
421    my $expr = shift;    my $expr = shift;
422    my $callbackMap = shift;    my $values = shift;
423      my $delimiter = shift;
424    
425      $delimiter ||= '->';
426    
427    my $value;    my $value;
428    # detect for callback (code-reference)    # detect for callback (code-reference)
429    if (ref($expr) eq 'CODE') {    if (ref($expr) eq 'CODE') {
430      $value = &$expr($obj);      $value = &$expr($obj);
431    
432    } elsif ($expr =~ m/->/) {    } elsif ($expr =~ m/$delimiter/) {
433      # use expr as complex object reference declaration (obj->subObj->subSubObj->0->attribute)      # use expr as complex object reference declaration (obj->subObj->subSubObj->0->attribute)
434      (my $objPerlRefString, my $parts) = refexpr2perlref_parts($expr);      (my $objPerlRefString, my $parts) = refexpr2perlref_parts($expr, $delimiter);
435      #print "\n", "expr: $expr";      
436      #print "\n", "objPerlRefString: $objPerlRefString";      # trace
437      $value = eval('$obj' . '->' . $objPerlRefString);        #print "expr: $expr", "\n";
438          #print "objPerlRefString: $objPerlRefString", "\n";
439        
440        my $evstr = '$obj' . '->' . $objPerlRefString;
441        
442        # trace
443          #print "eval: $evstr", "\n";
444        
445        $value = eval($evstr);
446        die ($@) if $@;
447            
448      # if value isn't set, try to "fallback" to callbackMap      # if value isn't set, try to set it
449        my $callbackMap;
450        if ($values) {
451          #if (ref $values eq 'HASH') {
452          if (ref $values eq 'Data::Map') {
453            $callbackMap = $values->getAttributes();
454          } else {
455            # apply $values as single value to referenced slot
456            #print "APPLY!", "\n";
457            eval('$obj' . '->' . $objPerlRefString . ' = $values;');
458            die ($@) if $@;
459          }
460        }
461        
462        # determine $values - if it's a hashref, use it as a "valueMap"
463        # "fallback" to callbackMap
464      # callbacks are applied this way:      # callbacks are applied this way:
465      #   take the last element of the expression parts and check if this string exists as a key in the callback-map      #   take the last element of the expression parts and check if this string exists as a key in the callback-map
466      if (!$value && $callbackMap) {      if (!$value && $callbackMap) {
# Line 458  sub refexpr2perlref { Line 491  sub refexpr2perlref {
491    
492  sub refexpr2perlref_parts {  sub refexpr2perlref_parts {
493    my $expr = shift;    my $expr = shift;
494      my $delimiter = shift;
495    
496      $delimiter = quotemeta($delimiter);
497    
498    # split expression by dereference operators first    # split expression by dereference operators first
499    my @parts_pure = split(/->/, $expr);    my @parts_pure = split(/$delimiter/, $expr);
500    
501    # wrap []'s around each part, if it consists of numeric characters only (=> numeric = array-index),    # wrap []'s around each part, if it consists of numeric characters only (=> numeric = array-index),
502    # use {}'s, if there are word-characters in it (=> alphanumeric = hash-key)    # use {}'s, if there are word-characters in it (=> alphanumeric = hash-key)
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