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Catalyst::Controller::BindLex.3pm

NAME

Catalyst::Controller::BindLex - Unmaintained, dangerous proof of concept

SYNOPSIS

     package MyApp::Controller::Moose;
     use base qw/Catalyst::Controller::BindLex/;
 
     sub bar : Local {
         my ( $self, $c ) = @_;
 
         my $x : Stashed;
         my %y : Stashed;
 
         $x = 100;
         
         do_something( $c->stash->{x} ); # 100
     
         $c->forward( "gorch" );
     }
 
     sub gorch : Private {
         my ( $self, $c ) = @_;
         my $x : Stashed;
 
         do_something( $x ); # still 100
     }
 
     sub counter : Local {
         my ( $self, $c ) = @_;
         my $count : Session;
         $c->res->body( "request number " . ++$count );
     }
 
 

WARNING

Catalyst::Controller::BindLex does some fairly nasty magic - the attribute wrapping tricks are complex and will break if you declare the same lexical name twice in the same method, and the approach to get $c out of the call stack is hacky and fragile.

It was designed as a PROOF OF CONCEPT ONLY and should not be considered for use in production. The authors no longer consider it a viable implementation plan and THIS MODULE IS NOT SUPPORTED AND WILL NOT BE MAINTAINED.

If you really want to use it, please read the source code and be sure you understand it well enough to fix anything that goes wrong, then set

     __PACKAGE__->config->{unsafe_bindlex_ok} = 1;
 
 

in your controller class to suppress the startup warning.

DESCRIPTION

This plugin lets you put your lexicals on the stash and elsewhere very easily.

It uses some funky modules to get its job done: PadWalker, Array::RefElem, Devel::Caller, Devel::LexAlias, and attributes. In some people's opinion this hurts this plugin's reputation ;-).

If you use the same name for two variables with the same storage binding attribute they will be aliased to each other, so you can use this for reading as well as writing values across controller subs. This is almost like sharing your lexical scope.

WHY ISN'T THIS A PLUGIN?

The way attributes are handled this can't be a plugin - the MODIFY_SCALAR_ATTRIBUTES methods and friends need to be in the class where the lexical is attributed, and this is typically a controller.

CONFIGURATION

You can add attributes to the configaration by mapping attributes to handlers.

Handlers are either strings of methods to be called on $c with no arguments, which are expected to return a hash reference (like "stash", "session", etc), or code references invoked with $c, a reference to the variable we're binding, and the name of the variable we're binding, also expected to return a hash reference.

DEFAULT ATTRIBUTES

Some default attributes are pre-configured:

Stash, Stashed

Session, Sessioned

Flash, Flashed

Bind the variable to a key in "stash", "session", or "flash" respectively.

The latter two require the use of a session; see Catalyst::Plugin::Session.

METHODS

bindlex_default_config( )

MODIFY_ARRAY_ATTRIBUTES( )

MODIFY_HASH_ATTRIBUTES( )

MODIFY_SCALAR_ATTRIBUTES( )

RECIPES

Param

To get

     my $username : Param;
 
 

add

     __PACKAGE__->config->{bindlex}{Param} = sub { $_[0]->req->params };
 
 

AUTHORS

Matt S. Trout

Yuval Kogman

SEE ALSO

PadWalker, Array::RefElem, Devel::Caller, Devel::LexAlias, Sub::Parameters

COPYRIGHT & LICENSE

         Copyright (c) 2005 the aforementioned authors. All rights
         reserved. This program is free software; you can redistribute
         it and/or modify it under the same terms as Perl itself.