NAME

Minima::Router -- Define and match URIs to controllers and methods

SYNOPSIS

use Minima::Router;

my $router = Minima::Router->new;

$router->read_file('etc/routes.map');
my $match = $router->match($env); # Plack env

# unless ($match) ... handle a no match case

my $controller = $match->{controller};
my $method = $match->{action};

try {
    $controller->$action;
} catch ($e) {
    $match = $router->error_route;
    # handle error
}

DESCRIPTION

Minima::Router is built on top of Router::Simple and serves as a dispatcher for web applications, interfacing between a routes file and the router itself.

This module parses a custom syntax (see below) for determining routes and is tightly integrated with the Minima framework, being used by Minima::App automatically.

Using This Module Outside Minima

A matched route returns, by definition, a controller name and action in the form of a hash reference. This hash may contain more data, such as data extracted from the URI by Router::Simple. The main controller and action keys may be undefined if not provided in the routes file.

As long as your use case accepts this hash, there is nothing preventing you from using this module independently.

ROUTES FILE

Syntax

A routes file contains one route per line and follows a rigid structure of four columns separated by whitespace (spaces or tabs):

<method or directive>  <route name>  <controller>  <action>

Blank lines are discarded, and lines beginning with # are considered comments and are also discarded. Your routes file may be placed anywhere and have any extension.

Method or Directive

The name of the HTTP method to which this route applies (GET, POST, etc.). This value may also be set to *, in which case any method is permitted for this route. If set to @, the route represents a special directive determined in conjunction with the next column.

Route Name

The name or pattern of this route, in any format understood by Router::Simple. If this route is a directive, the currently accepted values for the route name and their meanings are:

not_found

Registers the controller and action pair as the return value for cases where the router didn't find any valid match.

server_error

Registers the controller and action pair as the return value for the method error_route. Note: Use a controller that requires minimal setup as your error handler. If your controller failed due to a database error, for instance, there is no point in trying to start it again just to show an error page.

Minima::App will call the error method with an argument representing the exception. If desired, the method can utilize this argument.

Controller

The name of the controller that will respond to this match, returned in the match hash reference with the key controller. If the controller name starts with :, then Controller: will be automatically prepended.

This may be left blank only if the next column is also blank, which will be translated as undef in the match hash.

Action

Name of the method that should be called on the controller to this match, returned in the match hash reference with the key action.

This may be left blank, which will be translated as undef in the match hash.

Example

# Main Routes
*       /               :Main         home
GET     /about          :Main         about_page
GET     /blog/{post}    Blog::Main    article

# Form processing
POST    /contact        :Form         contact

# Special
@       not_found       :Main         not_found_page
@       server_error    :Error        error_page

METHODS

new

Constructs a new object. No arguments required.

read_file

method read_file ($file)

Parses the routes file given as an argument and registers the routes. This method can be called multiple times on the same instance to process more than one file.

match

method match ($env)

Performs a match on the passed Plack $env, or URI, and returnes a hash reference containing the controller-action pair as well as extra data extracted from the URI match.

{ controller => '...', action => '...' }

If no match is made and a not found route is registered (via the not_found directive), its data is returned. If no match is found and no special directive is present in the routes file, it returns undef.

Note that this does not call the controller. It's up to the user to do that in order to perform the intended action.

error_route

method error_route ()

Returns the controller-action pair registered with the server_error directive. If nothing was registered, returns undef.

clear_routes

method clear_routes ()

Removes all registered routes.

SEE ALSO

Minima, Router::Simple, Plack, perlclass.

AUTHOR

Cesar Tessarin, <cesar@tessarin.com.br>.

Written in September 2024.

cpanm Minima

perl -MCPAN -e shell
install Minima