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.\" ========================================================================
.\"
.IX Title "Path::Dispatcher::Rule 3pm"
.TH Path::Dispatcher::Rule 3pm "2013-03-14" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Path::Dispatcher::Rule \- predicate and codeblock
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&    my $rule = Path::Dispatcher::Rule::Regex\->new(
\&        regex => qr/^quit/,
\&        block => sub { die "Program terminated by user.\en" },
\&    );
\&
\&    $rule\->match("die"); # undef, because "die" !~ /^quit/
\&
\&    my $match = $rule\->match("quit"); # creates a Path::Dispatcher::Match
\&
\&    $match\->run; # exits the program
.Ve
.SH "DESCRIPTION"
.IX Header "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).
.PP
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.
.SH "ATTRIBUTES"
.IX Header "ATTRIBUTES"
.SS "block"
.IX Subsection "block"
An optional block of code to be run. Please use the \f(CW\*(C`run\*(C'\fR method instead of
invoking this attribute directly.
.SS "prefix"
.IX Subsection "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 \f(CW\*(C`ticket\*(C'\fR.
The unmatched, latter part of the path will be available in the match object.
.SH "METHODS"
.IX Header "METHODS"
.SS "match path \-> match"
.IX Subsection "match path -> match"
Takes a path and returns a Path::Dispatcher::Match object if it matched the
predicate, otherwise \f(CW\*(C`undef\*(C'\fR. The match object contains information about the
match, such as the results (e.g. for regex, a list of the captured variables),
the \f(CW\*(C`leftover\*(C'\fR path if \f(CW\*(C`prefix\*(C'\fR matching was used, etc.
.SS "run"
.IX Subsection "run"
Runs the rule's codeblock. If none is present, it throws an exception.