Robert Krimen > Hash-Dispatch-0.0010 > Hash::Dispatch

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Module Version: 0.0010   Source  

NAME ^

Hash::Dispatch - Find CODE in a hash (hashlike)

VERSION ^

version 0.0010

SYNOPSIS ^

    $dispatch = Hash::Dispatch->dispatch(

        'xyzzy' => sub {
            return 'xyzzy';
        },

        qr/.../ => 'xyzzy',

        ...

    );

    $result = $dispatch->dispatch( 'xyzzy' );

    $result->value->( ... );

DESCRIPTION ^

Hash::Dispatch is a tool for creating a hash-like lookup for returning a CODE reference

It is hash-like because a query against the dispatcher will only return once a CODE reference a found. If a key (a string or regular expression) maps to a string, then that will cause the lookup to begin again with the new value, recursing until a CODE reference is found or a deadend is reached:

    a => CODE0
    b => CODE1
    c => CODE2
    d => a
    qr/z/ => c

    query( a ) => CODE0
    query( b ) => CODE1
    query( d ) => CODE0
    query( xyzzy ) => CODE2
    query( j ) => undef

Hash::Dispatch will throw an exception if it is cycling:

    a => b
    b => a

    query( a ) => {{{ Exception! }}}

USAGE ^

$dispatcher = Hash::Dispatch->dispatch( ... )

Returns a new $dispatcher with the given mapping

$result = $dispatcher->dispatch( <query> )

Search $dispatcher with <query>

Returns an object with a ->value method that contains the CODE reference

Returns undef is nothing is found

AUTHOR ^

Robert Krimen <robertkrimen@gmail.com>

COPYRIGHT AND LICENSE ^

This software is copyright (c) 2011 by Robert Krimen.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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