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101 lines
3.4 KiB
Perl
101 lines
3.4 KiB
Perl
###############################################################################
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#
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# Package: NaturalDocs::DefineMembers
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#
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###############################################################################
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#
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# A custom Perl pragma to define member constants and accessors for use in Natural Docs objects while supporting inheritance.
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#
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# Each member will be defined as a numeric constant which should be used as that variable's index into the object arrayref.
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# They will be assigned sequentially from zero, and take into account any members defined this way in parent classes. Note
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# that you can *not* use multiple inheritance with this method.
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#
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# If a parameter ends in parenthesis, it will be generated as an accessor for the previous member. If it also starts with "Set",
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# the accessor will accept a single parameter to replace the value with. If it's followed with "duparrayref", it will assume the
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# parameter is either an arrayref or undef, and if the former, will duplicate it to set the value.
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#
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# Example:
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#
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# > package MyPackage;
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# >
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# > use NaturalDocs::DefineMembers 'VAR_A', 'VarA()', 'SetVarA()',
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# > 'VAR_B', 'VarB()',
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# > 'VAR_C',
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# > 'VAR_D', 'VarD()', 'SetVarD() duparrayref';
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# >
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# > sub SetC #(C)
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# > {
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# > my ($self, $c) = @_;
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# > $self->[VAR_C] = $c;
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# > };
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#
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###############################################################################
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# This file is part of Natural Docs, which is Copyright (C) 2003-2008 Greg Valure
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# Natural Docs is licensed under the GPL
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package NaturalDocs::DefineMembers;
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sub import #(member, member, ...)
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{
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my ($self, @parameters) = @_;
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my $package = caller();
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no strict 'refs';
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my $parent = ${$package . '::ISA'}[0];
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use strict 'refs';
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my $memberConstant = 0;
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my $lastMemberName;
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if (defined $parent && $parent->can('END_OF_MEMBERS'))
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{ $memberConstant = $parent->END_OF_MEMBERS(); };
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my $code = '{ package ' . $package . ";\n";
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foreach my $parameter (@parameters)
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{
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if ($parameter =~ /^(.+)\(\) *(duparrayref)?$/i)
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{
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my ($functionName, $pragma) = ($1, lc($2));
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if ($functionName =~ /^Set/)
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{
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if ($pragma eq 'duparrayref')
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{
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$code .=
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'sub ' . $functionName . '
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{
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if (defined $_[1])
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{ $_[0]->[' . $lastMemberName . '] = [ @{$_[1]} ]; }
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else
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{ $_[0]->[' . $lastMemberName . '] = undef; };
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};' . "\n";
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}
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else
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{
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$code .= 'sub ' . $functionName . ' { $_[0]->[' . $lastMemberName . '] = $_[1]; };' . "\n";
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};
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}
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else
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{
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$code .= 'sub ' . $functionName . ' { return $_[0]->[' . $lastMemberName . ']; };' . "\n";
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};
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}
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else
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{
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$code .= 'use constant ' . $parameter . ' => ' . $memberConstant . ";\n";
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$memberConstant++;
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$lastMemberName = $parameter;
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};
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};
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$code .= 'use constant END_OF_MEMBERS => ' . $memberConstant . ";\n";
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$code .= '};';
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eval $code;
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};
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1;
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