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package App::REPL;
use strict;
use warnings;
use App::REPL::Plugin::Defaults;
sub new {
bless {
plugins => [
App::REPL::Plugin::Defaults->new,
]
}, shift;
}
sub run {
my $self = shift;
while (defined(my $line = $self->_read)) {
my @result = $self->_eval($line);
$self->_print(@result);
}
print "\n";
}
sub _read {
my $self = shift;
$self->_wrapped_plugin('display_prompt');
my ($line) = $self->_wrapped_plugin('read_line');
($line) = $self->_chained_plugin('munge_line', $line);
return $line;
}
sub _eval {
my $self = shift;
my ($line) = @_;
return $self->_wrapped_plugin('evaluate', $line);
}
sub _print {
my $self = shift;
my (@result) = @_;
@result = $self->_chained_plugin('munge_result', @result);
$self->_wrapped_plugin('print_result', @result);
}
sub _wrapped_plugin {
my $self = shift;
my $plugins = ref($_[0]) ? pop : $self->{plugins};
my ($method, @args) = @_;
$plugins = [ grep { $_->can($method) } @$plugins ];
return @args unless @$plugins;
my $plugin = shift @$plugins;
my $next = sub { $self->_wrapped_plugin($plugins, @_) };
return $plugin->$method($next, @args);
}
sub _chained_plugin {
my $self = shift;
my $plugins = ref($_[0]) ? pop : $self->{plugins};
my ($method, @args) = @_;
$plugins = [ grep { $_->can($method) } @$plugins ];
for my $plugin (@$plugins) {
@args = $plugin->$method(@args);
}
return @args;
}
1;
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