NAME

Router::Simple - simple HTTP router

SYNOPSIS

    use Router::Simple;

    my $router = Router::Simple->new();
    $router->connect('/', {controller => 'Root', action => 'show'});
    $router->connect('/blog/{year}/{month}', {controller => 'Blog', action => 'monthly'});

    my $app = sub {
        my $env = shift;
        if (my $p = $router->match($env)) {
            # $p = { controller => 'Blog', action => 'monthly', ... }
        } else {
            [404, [], ['not found']];
        }
    };

DESCRIPTION

Router::Simple is a simple router class.

Its main purpose is to serve as a dispatcher for web applications.

Router::Simple can match against PSGI $env directly, which means it's easy to use with PSGI supporting web frameworks.

HOW TO WRITE A ROUTING RULE

plain string

    $router->connect( '/foo', { controller => 'Root', action => 'foo' } );

'*' notation

    $router->connect( '/download/*.*', { controller => 'Download', action => 'file' } );
    ...
    $router->match('/download/path/to/file.xml');
    # => {controller => 'Download', action => 'file', splat => ['path/to/file', 'xml'] }

'*' notation matches "qr{(.+)}". You will get the captured argument as an array ref for the special key "splat".

'{year}' notation

    $router->connect( '/blog/{year}', { controller => 'Blog', action => 'yearly' } );
    ...
    $router->match('/blog/2010');
    # => {controller => 'Blog', action => 'yearly', year => 2010 }

'{year}' notation matches "qr{([^/]+)}", and it will be captured.

'{year:[0-9]+}' notation

    $router->connect( '/blog/{year:[0-9]+}/{month:[0-9]{2}}', { controller => 'Blog', action => 'monthly' } );
    ...
    $router->match('/blog/2010/04');
    # => {controller => 'Blog', action => 'monthly', year => 2010, month => '04' }

You can specify regular expressions in named captures.

regexp

    $router->connect( qr{/blog/(\d+)/([0-9]{2})', { controller => 'Blog', action => 'monthly' } );
    ...
    $router->match('/blog/2010/04');
    # => {controller => 'Blog', action => 'monthly', splat => [2010, '04'] }

You can use Perl5's powerful regexp directly, and the captured values are stored in the special key "splat".

METHODS

my $router = Router::Simple->new();

Creates a new instance of Router::Simple.

$router->method_not_allowed() : Boolean

This method returns last "$router->match()" call is rejected by HTTP method or not.

$router->connect([$name, ] $pattern, \%destination[, \%options])

Adds a new rule to $router.

    $router->connect( '/', { controller => 'Root', action => 'index' } );
    $router->connect( 'show_entry', '/blog/:id',
        { controller => 'Blog', action => 'show' } );
    $router->connect( '/blog/:id', { controller => 'Blog', action => 'show' } );
    $router->connect( '/comment', { controller => 'Comment', action => 'new_comment' }, {method => 'POST'} );

"\%destination" will be used by match method.

You can specify some optional things to "\%options". The current version supports 'method', 'host', and 'on_match'.

method

'method' is an ArrayRef[String] or String that matches REQUEST_METHOD in $req.

host

'host' is a String or Regexp that matches HTTP_HOST in $req.

on_match

    $r->connect(
        '/{controller}/{action}/{id}',
        {},
        {
            on_match => sub {
                my($env, $match) = @_;
                $match->{referer} = $env->{HTTP_REFERER};
                return 1;
            }
        }
    );

A function that evaluates the request. Its signature must be "($environ, $match) => bool". It should return true if the match is successful or false otherwise. The first argument is $env which is either a PSGI environment or a request path, depending on what you pass to "match" method; the second is the routing variables that would be returned if the match succeeds.

The function can modify $env (in case it's a reference) and $match in place to affect which variables are returned. This allows a wide range of transformations.

"$router->submapper($path, [\%dest, [\%opt]])"

    $router->submapper('/entry/', {controller => 'Entry'})

This method is shorthand for creating new instance of Router::Simple::Submapper.

The arguments will be passed to "Router::Simple::SubMapper->new(%args)".

"$match = $router->match($env|$path)"

Matches a URL against one of the contained routes.

The parameter is either a PSGI $env or a plain string that represents a path.

This method returns a plain hashref that would look like:

    {
        controller => 'Blog',
        action     => 'daily',
        year => 2010, month => '03', day => '04',
    }

It returns undef if no valid match is found.

"my ($match, $route) = $router->routematch($env|$path);"

Match a URL against one of the routes contained.

Will return undef if no valid match is found, otherwise a result hashref and a Router::Simple::Route object is returned.

"$router->as_string()"

Dumps $router as string.

Example output:

    home         GET  /
    blog_monthly GET  /blog/{year}/{month}
                 GET  /blog/{year:\d{1,4}}/{month:\d{2}}/{day:\d\d}
                 POST /comment
                 GET  /