NAME

Path::Dispatcher::Rule - predicate and codeblock

VERSION

version 1.08

SYNOPSIS

    my $rule = Path::Dispatcher::Rule::Regex->new(
        regex => qr/^quit/,
        block => sub { die "Program terminated by user.\n" },
    );

    $rule->match("die"); # undef, because "die" !~ /^quit/

    my $match = $rule->match("quit"); # creates a Path::Dispatcher::Match

    $match->run; # exits the program

DESCRIPTION

A rule has a predicate and an optional codeblock. Rules can be matched (which checks the predicate against the path) and they can be ran (which invokes the codeblock).

This class is not meant to be instantiated directly, because there is no predicate matching function. Instead use one of the subclasses such as Path::Dispatcher::Rule::Tokens.

ATTRIBUTES

block

An optional block of code to be run. Please use the run method instead of invoking this attribute directly.

prefix

A boolean indicating whether this rule can match a prefix of a path. If false, then the predicate must match the entire path. One use-case is that you may want a catch-all rule that matches anything beginning with the token ticket. The unmatched, latter part of the path will be available in the match object.

METHODS

match path -> match

Takes a path and returns a Path::Dispatcher::Match object if it matched the predicate, otherwise undef. The match object contains information about the match, such as the results (e.g. for regex, a list of the captured variables), the leftover path if prefix matching was used, etc.

run

Runs the rule's codeblock. If none is present, it throws an exception.

SUPPORT

Bugs may be submitted through the RT bug tracker (or bug-Path-Dispatcher@rt.cpan.org).

AUTHOR

Shawn M Moore, <sartak at bestpractical.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020 by Shawn M Moore.

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