| XML::SAX::Machines(3pm) | User Contributed Perl Documentation | XML::SAX::Machines(3pm) |
XML::SAX::Machines - manage collections of SAX processors
version 0.46
use XML::SAX::Machines qw( :all );
my $m = Pipeline(
"My::Filter1", ## My::Filter1 autoloaded in Pipeline()
"My::Filter2", ## My::Filter2 " " "
\*STDOUT, ## XML::SAX::Writer also loaded
);
$m->parse_uri( $uri ); ## A parser is autoloaded via
## XML::SAX::ParserFactory if
## My::Filter1 isn't a parser.
## To import only individual machines:
use XML::SAX::Machines qw( Manifold );
## Here's a multi-pass machine that reads one document, runs
## it through 5 filtering channels (one channel at a time) and
## reassembles it in to a single document.
my $m = Manifold(
"My::TableOfContentsExtractor",
"My::AbstractExtractor",
"My::BodyFitler",
"My::EndNotesFilter",
"My::IndexFilter",
);
$m->parse_string( $doc );
SAX machines are a way to gather and manage SAX processors without going nuts. Or at least without going completely nuts. Individual machines can also be like SAX processors; they don't need to parse or write anything:
my $w = XML::SAX::Writer->new( Output => \*STDOUT );
my $m = Pipeline( "My::Filter1", "My::Filter2", { Handler => $w } );
my $p = XML::SAX::ParserFactory->new( handler => $p );
More documentation to come; see XML::SAX::Pipeline, XML::SAX::Manifold, and XML::SAX::Machine for now.
Here are the machines this module knows about:
ByRecord Record oriented processing of documents.
L<XML::SAX::ByRecord>
Machine Generic "directed graph of SAX processors" machines.
L<XML::SAX::Machine>
Manifold Multipass document processing
L<XML::SAX::Manifold>
Pipeline A linear sequence of SAX processors
L<XML::SAX::Pipeline>
Tap An insertable pass through that examines the
events without altering them using SAX processors.
L<XML::SAX::Tap>
As mentioned in "LIMITATIONS", you might occasionally need to edit the config file to tell XML::SAX::Machine how to handle a particular SAX processor (SAX processors use a wide variety of API conventions).
The config file is a the Perl module XML::SAX::Machines::SiteConfig, which contains a Perl data structure like:
package XML::SAX::Machines::SiteConfig;
$ProcessorClassOptions = {
"XML::Filter::Tee" => {
ConstructWithHashedOptions => 1,
},
};
So far $Processors is the only available configuration structure. It contains a list of SAX processors with known special needs.
Also, so far the only special need is the ConstructWithHashes option which tells XML::SAX::Machine to construct such classes like:
XML::Filter::Tee->new(
{ Handler => $h }
);
instead of
XML::Filter::Tee->new( Handler => $h );
WARNING If you modify anything, apply your changes in a new file created from XML::SAX::Machines::SiteConfig.pm. On Debian systems, this should be placed in /etc/perl so that it is not overwritten during upgrade. Do not alter XML::SAX::Machines::ConfigDefaults.pm or you will lose your changes when you upgrade.
TODO: Allow per-app and per-machine overrides of options. When needed.
XML::SAX::Machines - manage collections of SAX processors
Barrie Slaymaker
Copyright 2002-2009 by Barrie Slaymaker.
This software is free. It is licensed under the same terms as Perl itself.
This software is copyright (c) 2013 by Barry Slaymaker.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
| 2022-06-28 | perl v5.34.0 |