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package Path::Dispatcher; # git description: v1.07-5-ge7be931 |
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# ABSTRACT: Flexible and extensible dispatch |
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our $VERSION = '1.08'; |
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use Moo; |
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use 5.008001; |
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# VERSION |
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use Scalar::Util 'blessed'; |
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use Path::Dispatcher::Rule; |
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use Path::Dispatcher::Dispatch; |
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use Path::Dispatcher::Path; |
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use constant dispatch_class => 'Path::Dispatcher::Dispatch'; |
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use constant path_class => 'Path::Dispatcher::Path'; |
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with 'Path::Dispatcher::Role::Rules'; |
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sub dispatch { |
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my $self = shift; |
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my $path = $self->_autobox_path(shift); |
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my $dispatch = $self->dispatch_class->new; |
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for my $rule ($self->rules) { |
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$self->_dispatch_rule( |
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rule => $rule, |
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dispatch => $dispatch, |
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path => $path, |
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); |
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} |
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return $dispatch; |
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} |
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sub _dispatch_rule { |
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my $self = shift; |
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my %args = @_; |
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my @matches = $args{rule}->match($args{path}); |
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$args{dispatch}->add_matches(@matches); |
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return @matches; |
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} |
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sub run { |
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my $self = shift; |
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my $path = shift; |
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my $dispatch = $self->dispatch($path); |
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return $dispatch->run(@_); |
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} |
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sub complete { |
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my $self = shift; |
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my $path = $self->_autobox_path(shift); |
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my %seen; |
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return grep { !$seen{$_}++ } map { $_->complete($path) } $self->rules; |
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} |
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sub _autobox_path { |
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my $self = shift; |
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my $path = shift; |
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unless (blessed($path) && $path->isa('Path::Dispatcher::Path')) { |
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$path = $self->path_class->new( |
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path => $path, |
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); |
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} |
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return $path; |
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} |
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__PACKAGE__->meta->make_immutable; |
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no Moo; |
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# don't require others to load our subclasses explicitly |
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require Path::Dispatcher::Rule::Alternation; |
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require Path::Dispatcher::Rule::Always; |
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require Path::Dispatcher::Rule::Chain; |
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require Path::Dispatcher::Rule::CodeRef; |
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require Path::Dispatcher::Rule::Dispatch; |
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require Path::Dispatcher::Rule::Empty; |
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require Path::Dispatcher::Rule::Enum; |
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require Path::Dispatcher::Rule::Eq; |
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require Path::Dispatcher::Rule::Intersection; |
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require Path::Dispatcher::Rule::Metadata; |
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require Path::Dispatcher::Rule::Regex; |
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require Path::Dispatcher::Rule::Sequence; |
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require Path::Dispatcher::Rule::Tokens; |
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require Path::Dispatcher::Rule::Under; |
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1; |
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__END__ |
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=pod |
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=encoding UTF-8 |
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=head1 NAME |
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Path::Dispatcher - Flexible and extensible dispatch |
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=head1 VERSION |
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version 1.08 |
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=head1 SYNOPSIS |
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use Path::Dispatcher; |
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my $dispatcher = Path::Dispatcher->new; |
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$dispatcher->add_rule( |
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Path::Dispatcher::Rule::Regex->new( |
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regex => qr{^/(foo)/}, |
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block => sub { warn shift->pos(1); }, |
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) |
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); |
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$dispatcher->add_rule( |
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Path::Dispatcher::Rule::Tokens->new( |
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tokens => ['ticket', 'delete', qr/^\d+$/], |
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delimiter => '/', |
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block => sub { delete_ticket(shift->pos(3)) }, |
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) |
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); |
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my $dispatch = $dispatcher->dispatch("/foo/bar"); |
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die "404" unless $dispatch->has_matches; |
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$dispatch->run; |
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=head1 DESCRIPTION |
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We really like L<Jifty::Dispatcher> and wanted to use it for L<Prophet>'s |
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command line. |
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The basic operation is that of dispatch. Dispatch takes a path and a list of |
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rules, and it returns a list of matches. From there you can "run" the rules |
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that matched. These phases are distinct so that, if you need to, you can |
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inspect which rules were matched without ever running their codeblocks. |
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Tab completion support is also available (see in particular |
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L<Path::Dispatcher::Cookbook/How can I configure tab completion for shells?>) |
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for the dispatchers you write. |
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Each rule may take a variety of different forms (which I think justifies the |
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"flexible" adjective in the module's description). Some of the rule types are: |
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=over 4 |
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=item L<Path::Dispatcher::Rule::Regex> |
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Matches the path against a regular expression. |
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=item L<Path::Dispatcher::Rule::Enum> |
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Match one of a set of strings. |
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=item L<Path::Dispatcher::Rule::CodeRef> |
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Execute a coderef to determine whether the path matches the rule. So you can |
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do anything you like. Though writing a domain-specific rule (see below) will |
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enable better introspection and encoding intent. |
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=item L<Path::Dispatcher::Rule::Dispatch> |
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Use another L<Path::Dispatcher> to match the path. This facilitates both |
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extending dispatchers (a bit like subclassing) and delegating to plugins. |
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175
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=back |
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Since L<Path::Dispatcher> is designed with good object-oriented programming |
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practices, you can also write your own domain-specific rule classes (which |
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earns it the "extensible" adjective). For example, in L<Prophet>, we have a |
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custom rule for matching, and tab completing, record IDs. |
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You may want to use L<Path::Dispatcher::Declarative> which gives you some sugar |
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inspired by L<Jifty::Dispatcher>. |
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185
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=head1 ATTRIBUTES |
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=head2 rules |
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A list of L<Path::Dispatcher::Rule> objects. |
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191
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=head1 METHODS |
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=head2 add_rule |
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Adds a L<Path::Dispatcher::Rule> to the end of this dispatcher's rule set. |
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=head2 dispatch path -> dispatch |
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Takes a string (the path) and returns a L<Path::Dispatcher::Dispatch> object |
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representing a list of matches (L<Path::Dispatcher::Match> objects). |
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=head2 run path, args |
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Dispatches on the path and then invokes the C<run> method on the |
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L<Path::Dispatcher::Dispatch> object, for when you don't need to inspect the |
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dispatch. |
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208
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The args are passed down directly into each rule codeblock. No other args are |
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given to the codeblock. |
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=head2 complete path -> strings |
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Given a path, consult each rule for possible completions for the path. This is |
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intended for tab completion. You can use it with L<Term::ReadLine> like so: |
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$term->Attribs->{completion_function} = sub { |
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my ($last_word, $line, $start) = @_; |
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my @matches = map { s/^.* //; $_ } $dispatcher->complete($line); |
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return @matches; |
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}; |
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This API is experimental and subject to change. In particular I think I want to |
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return an object that resembles L<Path::Dispatcher::Dispatch>. |
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=head1 SEE ALSO |
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=over 4 |
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=item L<http://sartak.org/talks/yapc-na-2010/path-dispatcher/> |
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=item L<http://sartak.org/talks/yapc-asia-2010/evolution-of-path-dispatcher/> |
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233
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=item L<http://github.com/miyagawa/plack-dispatching-samples> |
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=item L<Jifty::Dispatcher> |
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237
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=item L<Catalyst::Dispatcher> |
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239
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=item L<Mojolicious::Dispatcher> |
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241
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=item L<Path::Router> |
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243
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=item L<Router::Simple> |
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245
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=item L<http://github.com/bestpractical/path-dispatcher-debugger> - Not quite ready for release |
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247
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=back |
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249
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=head1 SUPPORT |
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251
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Bugs may be submitted through L<the RT bug tracker|https://rt.cpan.org/Public/Dist/Display.html?Name=Path-Dispatcher> |
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(or L<bug-Path-Dispatcher@rt.cpan.org|mailto:bug-Path-Dispatcher@rt.cpan.org>). |
253
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254
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=head1 AUTHOR |
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256
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Shawn M Moore, C<< <sartak at bestpractical.com> >> |
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258
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=head1 CONTRIBUTORS |
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260
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=for stopwords sartak Shawn M Moore Karen Etheridge robertkrimen Aaron Trevena David Pottage Florian Ragwitz clkao |
261
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262
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=over 4 |
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264
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=item * |
265
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266
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sartak <sartak@e417ac7c-1bcc-0310-8ffa-8f5827389a85> |
267
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268
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=item * |
269
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270
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Shawn M Moore <sartak@bestpractical.com> |
271
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272
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=item * |
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274
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Shawn M Moore <sartak@gmail.com> |
275
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276
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=item * |
277
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278
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Karen Etheridge <ether@cpan.org> |
279
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280
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=item * |
281
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282
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robertkrimen <robertkrimen@gmail.com> |
283
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284
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=item * |
285
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286
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Aaron Trevena <aaron@aarontrevena.co.uk> |
287
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288
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=item * |
289
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290
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David Pottage <david@chrestomanci.org> |
291
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292
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=item * |
293
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294
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Shawn M Moore <code@sartak.org> |
295
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296
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=item * |
297
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298
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Shawn M Moore <shawn.moore@iinteractive.com> |
299
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300
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=item * |
301
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302
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|
Florian Ragwitz <rafl@debian.org> |
303
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304
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=item * |
305
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306
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|
Shawn M Moore <shawn@bestpractical.com> |
307
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308
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=item * |
309
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310
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|
clkao <clkao@e417ac7c-1bcc-0310-8ffa-8f5827389a85> |
311
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312
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=back |
313
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314
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|
=head1 COPYRIGHT AND LICENSE |
315
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316
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|
This software is copyright (c) 2020 by Shawn M Moore. |
317
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318
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This is free software; you can redistribute it and/or modify it under |
319
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|
|
the same terms as the Perl 5 programming language system itself. |
320
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321
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|
=cut |