Created
November 18, 2011 22:00
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Filter Plugin
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package Mojolicious::Plugin::Filter; | |
use Mojo::Base 'Mojolicious::Plugin'; | |
# Register plugin | |
sub register { | |
my ($plugin, $mojo) = @_; | |
my %filters; | |
# Filter helper | |
$mojo->helper( | |
'filter' => sub { | |
my $c = shift; | |
my $name = shift; | |
my $cb = pop; | |
# No subscribers | |
unless (exists $filters{$name}) { | |
return $cb->(@_); | |
}; | |
# New filter object | |
Mojolicious::Plugin::Filter::Instance->new( | |
subscribers => [ @{$filters{ $name }}, $cb ], | |
param => \@_, | |
c => $c | |
)->next; | |
} | |
); | |
# Chain helper | |
$mojo->helper( | |
'chain' => sub { | |
my ($c, $name, $cb) = @_; | |
# Maybe first subscription | |
$filters{$name} //= []; | |
# Push callback | |
push (@{ $filters{$name} }, $cb); | |
} | |
); | |
}; | |
package Mojolicious::Plugin::Filter::Instance; | |
use Mojo::Base -base; | |
# Next method | |
sub next { | |
my $self = shift; | |
my $next = shift(@{$self->{subscribers}}); | |
# No next nothing | |
return unless $next; | |
# Subscriber callbacks | |
if (@{$self->{subscribers}} >= 1) { | |
$next->($self, $self->{c}, @{$self->{param}}); | |
} | |
# Final callback | |
else { | |
$next->($self->{c}, @{$self->{param}}); | |
}; | |
}; | |
__END__ | |
#!/usr/bin/env perl | |
use Mojolicious::Lite; | |
plugin 'Filter'; | |
app->chain( | |
'on_welcome' => sub { | |
my ($f, $c, $message) = @_; | |
$$message =~ s/e/a/g; | |
$f->next; | |
}); | |
app->chain( | |
'on_welcome' => sub { | |
my ($f, $c, $message) = @_; | |
$$message = lc($$message); | |
$f->next; | |
}); | |
get '/' => sub { | |
my $c = shift; | |
my $message = 'Hello World'; | |
$c->filter( | |
'on_welcome' => | |
\$message => | |
sub { | |
return $c->render_text($message); | |
}); | |
}; | |
app->start; |
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