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## $Id$ |
## $Id$ |
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## --------------------------------------------------------------------------- |
## --------------------------------------------------------------------------- |
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## $Log$ |
## $Log$ |
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## Revision 1.9 2003/02/18 19:35:56 joko |
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## +- modified 'sub refexpr2perlref': now can get the $delimiter passed, too |
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## |
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## Revision 1.8 2003/02/09 05:10:56 joko |
## Revision 1.8 2003/02/09 05:10:56 joko |
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## + minor update |
## + minor update |
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## |
## |
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} |
} |
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# FIXME: could this be refactored using expand? |
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# btw: "expand": look at scripts@CPAN (System Administration): |
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# there is a perl make with perl |
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sub var_deref { |
sub var_deref { |
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my $obj = shift; |
my $obj = shift; |
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my $options = shift; |
my $options = shift; |
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my $obj = shift; |
my $obj = shift; |
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my $expr = shift; |
my $expr = shift; |
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my $callbackMap = shift; |
my $values = shift; |
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my $delimiter = shift; |
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$delimiter ||= '->'; |
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my $value; |
my $value; |
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# detect for callback (code-reference) |
# detect for callback (code-reference) |
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if (ref($expr) eq 'CODE') { |
if (ref($expr) eq 'CODE') { |
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$value = &$expr($obj); |
$value = &$expr($obj); |
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} elsif ($expr =~ m/->/) { |
} elsif ($expr =~ m/$delimiter/) { |
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# use expr as complex object reference declaration (obj->subObj->subSubObj->0->attribute) |
# use expr as complex object reference declaration (obj->subObj->subSubObj->0->attribute) |
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(my $objPerlRefString, my $parts) = refexpr2perlref_parts($expr); |
(my $objPerlRefString, my $parts) = refexpr2perlref_parts($expr, $delimiter); |
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#print "\n", "expr: $expr"; |
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#print "\n", "objPerlRefString: $objPerlRefString"; |
# trace |
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$value = eval('$obj' . '->' . $objPerlRefString); |
#print "expr: $expr", "\n"; |
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#print "objPerlRefString: $objPerlRefString", "\n"; |
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my $evstr = '$obj' . '->' . $objPerlRefString; |
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# trace |
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#print "eval: $evstr", "\n"; |
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$value = eval($evstr); |
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die ($@) if $@; |
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# if value isn't set, try to "fallback" to callbackMap |
# if value isn't set, try to set it |
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my $callbackMap; |
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if ($values) { |
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#if (ref $values eq 'HASH') { |
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if (ref $values eq 'Data::Map') { |
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$callbackMap = $values->getAttributes(); |
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} else { |
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# apply $values as single value to referenced slot |
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#print "APPLY!", "\n"; |
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eval('$obj' . '->' . $objPerlRefString . ' = $values;'); |
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die ($@) if $@; |
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} |
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} |
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# determine $values - if it's a hashref, use it as a "valueMap" |
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# "fallback" to callbackMap |
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# callbacks are applied this way: |
# callbacks are applied this way: |
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# take the last element of the expression parts and check if this string exists as a key in the callback-map |
# take the last element of the expression parts and check if this string exists as a key in the callback-map |
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if (!$value && $callbackMap) { |
if (!$value && $callbackMap) { |
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sub refexpr2perlref_parts { |
sub refexpr2perlref_parts { |
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my $expr = shift; |
my $expr = shift; |
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my $delimiter = shift; |
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$delimiter = quotemeta($delimiter); |
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# split expression by dereference operators first |
# split expression by dereference operators first |
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my @parts_pure = split(/->/, $expr); |
my @parts_pure = split(/$delimiter/, $expr); |
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# 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), |
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# use {}'s, if there are word-characters in it (=> alphanumeric = hash-key) |
# use {}'s, if there are word-characters in it (=> alphanumeric = hash-key) |