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CGI::Application::Plugin::AnyTemplate::Base.3pm

NAME

CGI::Application::Plugin::AnyTemplate::Base - Base class for templates

DESCRIPTION

This documentation is mainly for developers who want to write additional Template drivers. For how to use the system, see the docs for CGI::Application::Plugin::AnyTemplate

METHODS

param

The "param" method gets and sets values within the template.

     my $template = $self->template->load;
 
     my @param_names = $template->param();
 
     my $value = $template->param('name');
 
     $template->param('name' => 'value');
     $template->param(
         'name1' => 'value1',
         'name2' => 'value2'
     );
 
 

It is designed to behave similarly to the "param" method in other modules like "CGI" and "HTML::Template".

get_param_hash

Returns the template variables as a hash of names and values.

     my %params     = $template->get_param_hash;
 
 

In a scalar context, returns a reference to the hash used internally to contain the values:

     my $params_ref = $template->get_param_hash;
 
 

clear_params

Clears the values stored in the template:

     $template->param(
         'name1' => 'value1',
         'name1' => 'value2'
     );
     $template->clear_params;
     $template->param(
         'name_foo' => 'value_bar',
     );
 
     # params are now:
         'name_foo' => 'value_bar',
 
 

output

Returns the template with all the values filled in.

     return $template->output();
 
 

You can also supply names and values to the template at this stage:

     return $template->output('name' => 'value', 'name2' => 'value2');
 
 

Before the template output is generated, the "template_pre_process" hook is called. Any callbacks that you register to this hook will be called before each template is processed. Register a "template_pre_process" callback as follows:

     $self->add_callback('template_pre_process', \&my_tmpl_pre_process);
 
 

Pre-process callbacks will be passed a reference to the $template object, and can can modify the parameters passed into the template by using the "param" method:

     sub my_tmpl_pre_process {
         my ($self, $template) = @_;
 
         # Change the internal template parameters by reference
         my $params = $template->get_param_hash;
 
         foreach my $key (keys %$params) {
             $params{$key} = to_piglatin($params{$key});
         }
 
         # Can also set values using the param method
         $template->param('foo', 'bar');
 
     }
 
 

After the template output is generated, the "template_post_process" hook is called. You can register a "template_post_process" callback as follows:

     $self->add_callback('template_post_process', \&my_tmpl_post_process);
 
 

Any callbacks that you register to this hook will be called after each template is processed, and will be passed both a reference to the template object and a reference to the output generated by the template. This allows you to modify the output of the template:

     sub my_tmpl_post_process {
         my ($self, $template, $output_ref) = @_;
 
         $$output_ref =~ s/foo/bar/;
     }
 
 

When you call the "output" method, any components embedded in the template are run. See "EMBEDDED COMPONENTS", below.

filename

If the template was loaded from a file, the "filename" method returns the template filename.

string_ref

If the template was loaded from a string, the "string_ref" method returns a reference to the string.

object

Returns a reference to the underlying template driver, e.g. the "HTML::Template" object or the "Template::Toolkit" object.

DOCS FOR TEMPLATE MODULE DEVELOPERS

The following documentation is of interest primarly for developers who wish to add support for a new type of Template system.

METHODS FOR DEVELOPERS

initialize

This method is called by the controller at "load" to create the driver-specific subclass of "CGI::Application::Plugin::AnyTemplate"

This is a virtual method and must be defined in the subclass.

The following paramters are passed to the driver and available as keys of the driver's $self object:

      'driver_config' => ...    # hashref of driver-specific config
      'native_config' => ...    # hashref of native template system specific config
      'include_paths' => ...    # listref of template include paths
      'filename'      => ...    # template filename
      'webapp'        => ...    # reference to the current CGI::Application $self
 
 

driver_config_keys

When it creates the driver object, "CGI::Application::Plugin::AnyTemplate" has to separate the "driver_config" from the "native_config".

"driver_config_params" should return a list of parameters that are specific to the driver_config and not the native template system config.

For instance, the user can specify

     $self->template->config(
         HTMLTemplate => {
               embed_tag_name    => 'embed',
               global_vars       => 1,
               die_on_bad_params => 0,
               cache             => 1
         },
     );
 
 

The parameters "global_vars", "die_on_bad_params", and "cache" are all specific to HTML::Template. These are considered native parameters.

But "embed_tag_name" configures the "CGI::Application::Plugin::AnyTemplate::Driver::HTMLTemplate" subclass. This is considered a driver parameter.

Therefore 'embed_tag_name' should be included in the list of params returned by "driver_config_params".

Example "driver_config_params":

     sub driver_config_keys {
         'template_extension',
         'embed_tag_name'
     }
 
 

default_driver_config

Should return a hash of default values for "driver_config_params".

For instance:

     sub default_driver_config {
         {
             template_extension => '.foo',
             embed_tag_name     => 'embed',
         };
     }
 
 

render_template

This method must be overriden in a subclass. It has the responsibility of filling the template in "$self->filename" with the values in "$self->param" via the appropriate template system, and returning the output as either a string or a reference to a string.

It also must manage embedding nested components.

AUTHOR

Michael Graham, "<mag-perl@occamstoothbrush.com>"

BUGS

Please report any bugs or feature requests to "bug-cgi-application-plugin-anytemplate@rt.cpan.org", or through the web interface at <http://rt.cpan.org>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SEE ALSO

     CGI::Application::Plugin::AnyTemplate
     CGI::Application::Plugin::AnyTemplate::ComponentHandler
     CGI::Application::Plugin::AnyTemplate::Driver::HTMLTemplate
     CGI::Application::Plugin::AnyTemplate::Driver::HTMLTemplateExpr
     CGI::Application::Plugin::AnyTemplate::Driver::HTMLTemplatePluggable
     CGI::Application::Plugin::AnyTemplate::Driver::TemplateToolkit
     CGI::Application::Plugin::AnyTemplate::Driver::Petal
 
     CGI::Application
 
     Template::Toolkit
     HTML::Template
 
     HTML::Template::Pluggable
     HTML::Template::Plugin::Dot
 
     Petal
 
     CGI::Application::Plugin::TT
 
 

COPYRIGHT & LICENSE

Copyright 2005 Michael Graham, All Rights Reserved.

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