4 # SAX version of XML::Template. Advantages over DOM: Doesn't have to load
5 # the entire thing into memory, and you can chain filters. Disadvantages:
6 # Slightly kludgier interface, and you won't get a DOM tree out.
8 # Differences from the DOM version:
10 # - There is no process(). Instead, it works as a SAX filter, so you put it
11 # in the stream, usually between a parser and a writer (ie.
12 # parser -> XML::TemplateSAX::Handler -> writer). process_file works as
13 # before, but it returns a _string_, not a DOM tree.
14 # - You can no longer insert a DOM tree, naturally. Instead, you can set up
15 # an XML::TemplateSAX::Buffer, let it gobble up your data, and send it
16 # in the way you'd insert a DOM tree. process_file_to_buffer does this
17 # transparently for you, returning a buffer you can give in. (In theory,
18 # one could avoid the buffering and just defer the parsing/filtering until
19 # it's needed, but Expat seems non-reentrant, which means starting a parser
20 # from within a begin_element callback blows up.)
27 use XML::TemplateSAX::Buffer;
28 use XML::TemplateSAX::Cleaner;
29 use XML::TemplateSAX::Handler;
31 package XML::TemplateSAX;
33 sub process_file_to_handler {
34 my ($filename, $handler, $obj, $clean) = @_;
35 $clean = 1 unless (defined($clean));
37 my ($cleaner, $filter, $parser);
41 $cleaner = XML::TemplateSAX::Cleaner->new(Handler => $handler);
42 $filter = XML::TemplateSAX::Handler->new(Handler => $cleaner, Content => $obj);
44 $filter = XML::TemplateSAX::Handler->new(Handler => $handler, Content => $obj);
47 # FIXME: hardcoding expat = not good?
48 $parser = XML::SAX::Expat->new(Handler => $filter);
49 $parser->parse_file($filename);
55 my ($filename, $obj, $clean) = @_;
58 my $writer = XML::SAX::Writer->new(Output => \$str);
60 process_file_to_handler($filename, $writer, $obj, $clean);
65 sub process_file_to_buffer {
66 my ($filename, $obj, $clean) = @_;
68 my $buffer = XML::TemplateSAX::Buffer->new;
69 process_file_to_handler($filename, $buffer, $obj, $clean);
75 my ($tag, $array, @elems) = @_;
78 my $num = scalar @elems;
80 for my $ref (@$array) {
82 $ref->{$tag} = $elems[$i++ % $num];