7 package XML::TemplateSAX::Handler;
8 use base qw(XML::SAX::Base);
15 obj => $options{'Content'},
17 Handler => $options{'Handler'}
24 my ($self, $data) = @_;
25 my $obj = $self->{'obj'};
28 my $id = $data->{'Attributes'}->{'{http://template.sesse.net/}id'};
29 $id = $id->{'Value'} if (defined($id));
31 # within a replacement; just ignore everything
32 return if (!defined($obj));
34 # within a cloning; slurp it up
35 if (ref($obj) eq 'XML::TemplateSAX::Buffer') {
36 $obj->start_element($data);
40 # substitution: see if this element matches anything. if so,
41 # descend down into the tree.
42 if (ref($obj) eq 'HASH') {
44 for my $key (keys %$obj) {
45 if ($key =~ /^#(.*)$/) {
46 if (defined($id) && $id eq $1) {
47 $match = $obj->{$key};
51 if ($data->{'LocalName'} eq $key) {
52 $match = $obj->{$key};
58 if (defined($match)) {
59 $self->SUPER::start_element($data);
61 push @{$self->{'stack'}}, [ $data->{'Name'}, $obj ];
64 # This is sort of ugly. We special-case replacement by outputting
65 # the string immediately, and then just ignoring the rest of the
66 # events until we get to the right end tag. It's not 100% technically
67 # correct for the case where you replace an entire document by a
68 # string, but that's nonsensical anyway.
71 $self->SUPER::characters({ Data => $match });
72 $self->{'obj'} = undef;
77 # Sort of the same, for cloning. Cloning works by gobbling up all the all the
78 # input until the end element, and put it into a buffer. when we get to the end
79 # element, spew it all out again as many times as we need, onto ourselves so we
80 # get filtering etc. right.
82 # We let the buffer object keep the actual array, so we can fetch it out later.
84 if (ref($match) eq 'ARRAY') {
85 $self->{'obj'} = XML::TemplateSAX::Buffer->new($match);
89 $self->{'obj'} = $match;
95 $self->SUPER::start_element($data);
99 my ($self, $data) = @_;
101 return if (!defined($self->{'obj'}));
103 if (ref($self->{'obj'}) eq 'XML::TemplateSAX::Buffer') {
104 $self->{'obj'}->characters($data);
108 $self->SUPER::characters($data);
112 my ($self, $data) = @_;
114 return if (!defined($self->{'obj'}));
116 if (ref($self->{'obj'}) eq 'XML::TemplateSAX::Buffer') {
117 $self->{'obj'}->comment($data);
121 $self->SUPER::comment($data);
124 sub processing_instruction {
125 my ($self, $data) = @_;
127 return if (!defined($self->{'obj'}));
129 if (ref($self->{'obj'}) eq 'XML::TemplateSAX::Buffer') {
130 $self->{'obj'}->processing_instruction($data);
134 $self->SUPER::processing_instruction($data);
138 my ($self, $data) = @_;
140 my $stack = $self->{'stack'};
141 if (scalar @$stack > 0) {
142 my $top = $stack->[scalar @$stack - 1];
144 if ($data->{'Name'} eq $top->[0]) {
145 my $obj = $self->{'obj'};
147 # did we just finish a clone operation?
148 if (ref($obj) eq 'XML::TemplateSAX::Buffer') {
149 for my $instance (@{$obj->{'ptr'}}) {
150 $self->{'obj'} = $instance;
155 $self->SUPER::end_element($data);
156 $self->{'obj'} = $top->[1];
162 return if (!defined($self->{'obj'}));
164 if (ref($self->{'obj'}) eq 'XML::TemplateSAX::Buffer') {
165 $self->{'obj'}->end_element($data);
169 $self->SUPER::end_element($data);