Andy Wardley > Template-Toolkit-2.24 > Template::Plugins

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Module Version: 2.77   Source   Latest Release: Template-Toolkit-2.26

NAME ^

Template::Plugins - Plugin provider module

SYNOPSIS ^

    use Template::Plugins;
    
    $plugin_provider = Template::Plugins->new(\%options);
    
    ($plugin, $error) = $plugin_provider->fetch($name, @args);

DESCRIPTION ^

The Template::Plugins module defines a provider class which can be used to load and instantiate Template Toolkit plugin modules.

METHODS ^

new(\%params)

Constructor method which instantiates and returns a reference to a Template::Plugins object. A reference to a hash array of configuration items may be passed as a parameter. These are described below.

Note that the Template front-end module creates a Template::Plugins provider, passing all configuration items. Thus, the examples shown below in the form:

    $plugprov = Template::Plugins->new({
        PLUGIN_BASE => 'MyTemplate::Plugin',
        LOAD_PERL   => 1,
        ...
    });

can also be used via the Template module as:

    $ttengine = Template->new({
        PLUGIN_BASE => 'MyTemplate::Plugin',
        LOAD_PERL   => 1,
        ...
    });

as well as the more explicit form of:

    $plugprov = Template::Plugins->new({
        PLUGIN_BASE => 'MyTemplate::Plugin',
        LOAD_PERL   => 1,
        ...
    });
    
    $ttengine = Template->new({
        LOAD_PLUGINS => [ $plugprov ],
    });

fetch($name, @args)

Called to request that a plugin of a given name be provided. The relevant module is first loaded (if necessary) and the load() class method called to return the factory class name (usually the same package name) or a factory object (a prototype). The new() method is then called as a class or object method against the factory, passing all remaining parameters.

Returns a reference to a new plugin object or ($error, STATUS_ERROR) on error. May also return (undef, STATUS_DECLINED) to decline to serve the request. If TOLERANT is set then all errors will be returned as declines.

CONFIGURATION OPTIONS ^

The following list summarises the configuration options that can be provided to the Template::Plugins new() constructor. Please consult Template::Manual::Config for further details and examples of each configuration option in use.

PLUGINS

The PLUGINS option can be used to provide a reference to a hash array that maps plugin names to Perl module names.

    my $plugins = Template::Plugins->new({
        PLUGINS => {
            cgi => 'MyOrg::Template::Plugin::CGI',
            foo => 'MyOrg::Template::Plugin::Foo',
            bar => 'MyOrg::Template::Plugin::Bar',
        },  
    }); 

PLUGIN_BASE

If a plugin is not defined in the PLUGINS hash then the PLUGIN_BASE is used to attempt to construct a correct Perl module name which can be successfully loaded.

    # single value PLUGIN_BASE
    my $plugins = Template::Plugins->new({
        PLUGIN_BASE => 'MyOrg::Template::Plugin',
    });

    # multiple value PLUGIN_BASE
    my $plugins = Template::Plugins->new({
        PLUGIN_BASE => [   'MyOrg::Template::Plugin',
                           'YourOrg::Template::Plugin'  ],
    });

LOAD_PERL

The LOAD_PERL option can be set to allow you to load regular Perl modules (i.e. those that don't reside in the Template::Plugin or another user-defined namespace) as plugins.

If a plugin cannot be loaded using the PLUGINS or PLUGIN_BASE approaches then, if the LOAD_PERL is set, the provider will make a final attempt to load the module without prepending any prefix to the module path.

Unlike regular plugins, modules loaded using LOAD_PERL do not receive a Template::Context reference as the first argument to the new() constructor method.

TOLERANT

The TOLERANT flag can be set to indicate that the Template::Plugins module should ignore any errors encountered while loading a plugin and instead return STATUS_DECLINED.

DEBUG

The DEBUG option can be used to enable debugging messages for the Template::Plugins module by setting it to include the DEBUG_PLUGINS value.

    use Template::Constants qw( :debug );
    
    my $template = Template->new({
        DEBUG => DEBUG_FILTERS | DEBUG_PLUGINS,
    });

TEMPLATE TOOLKIT PLUGINS ^

Please see Template::Manual::Plugins For a complete list of all the plugin modules distributed with the Template Toolkit.

AUTHOR ^

Andy Wardley <abw@wardley.org> http://wardley.org/

COPYRIGHT ^

Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO ^

Template::Manual::Plugins, Template::Plugin, Template::Context, Template.

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