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NAME

Path::Router - A tool for routing paths

SYNOPSIS

my $router = Path::Router.new;

$router.add-route('blog' => %(
    conditions => %( :method<GET> ),
    defaults => {
        controller => 'blog',
        action     => 'index',
    },
    # you can provide a fixed "target"
    # for a match as well, this can be
    # anything you want it to be ...
    target => My::App.get_controller('blog').get_action('index')
));

$router.add-route('blog/:year/:month/:day' => %(
    conditions => %( :method<GET> ),
    defaults => {
        controller => 'blog',
        action     => 'show_date',
    },
    # validate with ...
    validations => {
        # ... raw-Regexp refs
        year       => rx/\d ** 4/,
        # ... custom types you created
        month      => NumericMonth,
        # ... anon-subsets created inline
        day        => (anon subset NumericDay of Int where * <= 31),
    }
));

$router.add-route('blog/:action/?:id' => %(
    defaults => {
        controller => 'blog',
    },
    validations => {
        action  => rx/\D+/,
        id      => Int,  # also use Perl6 types too
    }
));

# even include other routers
$router.include-router( 'polls/' => $another_router );

# ... in your dispatcher

# returns a Path::Router::Route::Match object
my $match = $router.match('/blog/edit/15', context => %( method => 'GET' ));

# ... in your code

my $uri = $router.path-for(
    controller => 'blog',
    action     => 'show_date',
    year       => 2006,
    month      => 10,
    day        => 5,
);

DESCRIPTION

This module provides a way of deconstructing paths into parameters suitable for dispatching on. It also provides the inverse in that it will take a list of parameters, and construct an appropriate uri for it.

Reversable

This module places a high degree of importance on reversability. The value produced by a path match can be passed back in and you will get the same path you originally put in. The result of this is that it removes ambiguity and therefore reduces the number of possible mis-routings.

Verifiable

This module also provides additional tools you can use to test and verify the integrity of your router. These include:

  • An interactive shell in which you can test various paths and see the match it will return, and also test the reversability of that match.

  • A Test::Path::Router module which can be used in your applications test suite to easily verify the integrity of your paths.

Validated and Automatically Coerced

Each path may use one or more variables, each given a validation. If a numeric type is used, the value passed on to the action will also be coerced into the correct value.

Flexible

This module has no opinions about what it might be useful for. It simply produces a hash of values that can be used for dispatch, logging, or whatever your application is.

ATTRIBUTES

routes

has Path::Router::Route @.routes

Stores all the route objects that have been added to the router.

METHODS

method add-route

method add-route(Str $path, *%options --> Int)

Adds a new route to the end of the routes list.

Returns the number of routes stored.

method insert-route

method insert-route(Str $path, *%options --> Int)

Adds a new route to the routes list. You may specify an at parameter, which would indicate the position where you want to insert your newly created route. The at parameter is the index position in the list, so it starts at 0.

Returns the number of routes stored.

Examples:

# You have more than three paths, insert a new route at
# the 4th item
$router.insert-route($path => %(
    at => 3, |%options
));

# If you have less items than the index, then it's the same as
# as add_route -- it's just appended to the end of the list
$router.insert-route($path => %(
    at => 1_000_000, |%options
));

# If you want to prepend, omit "at", or specify 0
$router.insert-route($path => %(
    at => 0, |%options
));

method include-router

method include-router (Str $path, Path::Router $other-router --> Int)

This extracts all the route from $other-router and includes them into the invocant router and prepends $path to all their paths.

It should be noted that this does not do any kind of redispatch to the $other-router, it actually extracts all the paths from $other-router and inserts them into the invocant router. This means any changes to $other-router after inclusion will not be reflected in the invocant.

Returns the number of routes stored.

method match

method match(Str $path, :%context --> Path::Router::Route::Match)

Return a Path::Router::Route::Match object for the best route that matches the given the $path and %context (if given), or an undefined type-object if no routes match.

The %context is an optional value that is only used if routes with conditions are present. The context is used as an additional match in the process and can be used to apply extra conditions, such as matching the HTTP method when used in a web application.

The "best route" is chosen by first matching the $path against every route and then applying the following rules:

over

  • If no route matches, an undefined type object will be returned. If exactly one route matches, a match for that route will be returned.

  • If multiple routes match, the one with the most required variables will be considered the best match and be returned.

  • In the case that exactly two routes match and have the same number of variables, but one has conditions and the other does not, the one that has conditions will be considered best and returned.

  • Otherwise, if there is more than one matching route with the same number of required variables, an X::Path::Router::AmbiguousMatch::PathMatch exception is thrown. This exception contains all the best matches, so your code can disambiguate them in any way you want or treat this as an error condition as suits your application.

method path-for

method path-for(:%context, *%path_descriptor --> Str)

Find the path that, when passed to method match , would produce the given arguments. Returns the path without any leading /. Returns an undefined type-object if no routes match.

The %context is optional, but if present, this will also apply any route conditions to the given %context.

This will throw an X::Path::Router::AmbiguousMatch::ReverseMatch exception if multiple URLs match. This exception includes the possible routes so your code can disambiguate them in whatever fashion makes sense to you.

DEBUGGING

You can turn on the verbose debug logging with the PATH_ROUTER_DEBUG environment variable. Set that environment variable to a truthy value to enable debugging.

DIAGNOSTIC

X::Path::Router

All path router exceptions inherit from this exception class.

X::Path::Router::AmbiguousMatch::PathMatch

This exception is thrown when a path is found to match two different routes equally well.

Provides:

  • method path(--> Str) returns the ambiguous path.

  • method matches(--> Array) returns the best matches found.

X::Path::Router::AmbiguousMatch::ReverseMatch

This exception is thrown when two paths are found to match a given criteria when looking up the path-for a path

Provides:

  • method match-keys(--> Array[Str]) returns the mapping that was ambiguous

  • method routes(--> Array[Str]) returns the best matches found

X::Path::Router::BadInclusion

This exception is thrown whenever an attempt is made to include one router in another incorrectly.

X::Path::Router::BadRoute

This exception is thrown when a route has some serious flaw.

Provides:

  • method path(--> Str) returns the bad route

X::Path::Router::BadValidation

This is an X::Path::Router::BadRoute exception that is thrown when a validation for a variable that is not found in the path.

Provides:

  • method validation(--> Str) returns the validation variable that was named in the route, but was not found in the path

X::Path::Router::BadSlurpy

This is an X::Path::Router::BadRoute exception that is thrown when a validation attempts to add a slurpy parameter that is not at the end of the path.

AUTHOR

Andrew Sterling Hanenkamp lthanenkamp@cpan.orggt

Based very closely on the original Perl 5 version by Stevan Little ltstevan.little@iinteractive.comgt

COPYRIGHT

Copyright 2015 Andrew Sterling Hanenkamp.

LICENSE

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

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