--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/deprecated/buildtools/buildsystemtools/lib/XML/Handler/Subs.pm	Wed Oct 27 16:03:51 2010 +0800
@@ -0,0 +1,177 @@
+#
+# Copyright (C) 1999 Ken MacLeod
+# XML::Handler::XMLWriter is free software; you can redistribute it and/or
+# modify it under the same terms as Perl itself.
+#
+# $Id: Subs.pm,v 1.2 1999/12/22 21:15:00 kmacleod Exp $
+#
+
+use strict;
+
+package XML::Handler::Subs;
+
+use UNIVERSAL;
+
+use vars qw{ $VERSION };
+
+# will be substituted by make-rel script
+$VERSION = "0.07";
+
+sub new {
+    my $type = shift;
+    my $self = ($#_ == 0) ? { %{ (shift) } } : { @_ };
+
+    return bless $self, $type;
+}
+
+sub start_document {
+    my ($self, $document) = @_;
+
+    $self->{Names} = [];
+    $self->{Nodes} = [];
+}
+
+sub end_document {
+    my ($self, $document) = @_;
+
+    delete $self->{Names};
+    delete $self->{Nodes};
+
+    return();
+}
+
+sub start_element {
+    my ($self, $element) = @_;
+
+    push @{$self->{Names}}, $element->{Name};
+    push @{$self->{Nodes}}, $element;
+
+    my $el_name = "s_" . $element->{Name};
+    $el_name =~ s/[^a-zA-Z0-9_]/_/g;
+    if ($self->can($el_name)) {
+	$self->$el_name($element);
+	return 1;
+    }
+
+    return 0;
+}
+
+sub end_element {
+    my ($self, $element) = @_;
+
+    my $called_sub = 0;
+    my $el_name = "e_" . $element->{Name};
+    $el_name =~ s/[^a-zA-Z0-9_]/_/g;
+    if ($self->can(${el_name})) {
+	$self->$el_name($element);
+	$called_sub = 1;
+    }
+
+    pop @{$self->{Names}};
+    pop @{$self->{Nodes}};
+
+    return $called_sub;
+}
+
+sub in_element {
+    my ($self, $name) = @_;
+
+    return ($self->{Names}[-1] eq $name);
+}
+
+sub within_element {
+    my ($self, $name) = @_;
+
+    my $count = 0;
+    foreach my $el_name (@{$self->{Names}}) {
+	$count ++ if ($el_name eq $name);
+    }
+
+    return $count;
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+XML::Handler::Subs - a PerlSAX handler base class for calling user-defined subs
+
+=head1 SYNOPSIS
+
+ use XML::Handler::Subs;
+
+ package MyHandlers;
+ use vars qw{ @ISA };
+
+ sub s_NAME { my ($self, $element) = @_ };
+ sub e_NAME { my ($self, $element) = @_ };
+
+ $self->{Names};    # an array of names
+ $self->{Nodes};    # an array of $element nodes
+
+ $handler = MyHandlers->new();
+ $self->in_element($name);
+ $self->within_element($name);
+
+=head1 DESCRIPTION
+
+C<XML::Handler::Subs> is a base class for PerlSAX handlers.
+C<XML::Handler::Subs> is subclassed to implement complete behavior and
+to add element-specific handling.
+
+Each time an element starts, a method by that name prefixed with `s_'
+is called with the element to be processed.  Each time an element
+ends, a method with that name prefixed with `e_' is called.  Any
+special characters in the element name are replaced by underscores.
+
+Subclassing XML::Handler::Subs in this way is similar to
+XML::Parser's Subs style.
+
+XML::Handler::Subs maintains a stack of element names,
+`C<$self->{Names}', and a stack of element nodes, `C<$self->{Nodes}>'
+that can be used by subclasses.  The current element is pushed on the
+stacks before calling an element-name start method and popped off the
+stacks after calling the element-name end method.  The
+`C<in_element()>' and `C<within_element()>' calls use these stacks.
+
+If the subclass implements `C<start_document()>', `C<end_document()>',
+`C<start_element()>', and `C<end_element()>', be sure to use
+`C<SUPER::>' to call the the superclass methods also.  See perlobj(1)
+for details on SUPER::.  `C<SUPER::start_element()>' and
+`C<SUPER::end_element()>' return 1 if an element-name method is
+called, they return 0 if no method was called.
+
+XML::Handler::Subs does not implement any other PerlSAX handlers.
+
+XML::Handler::Subs supports the following methods:
+
+=over 4
+
+=item new( I<OPTIONS> )
+
+A basic `C<new()>' method.  `C<new()>' takes a list of key, value
+pairs or a hash and creates and returns a hash with those options; the
+hash is blessed into the subclass.
+
+=item in_element($name)
+
+Returns true if `C<$name>' is equal to the name of the innermost
+currently opened element.
+
+=item within_element($name)
+
+Returns the number of times the `C<$name>' appears in Names.
+
+=back
+
+=head1 AUTHOR
+
+Ken MacLeod, ken@bitsko.slc.ut.us
+
+=head1 SEE ALSO
+
+perl(1), PerlSAX.pod(3)
+
+=cut