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package Role::HasMessage::Errf 0.007; |
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use MooseX::Role::Parameterized; |
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# ABSTRACT: a thing with a String::Errf-powered message |
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#pod =head1 SYNOPSIS |
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#pod |
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#pod In your class... |
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#pod |
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#pod package Errfy; |
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#pod use Moose; |
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#pod |
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#pod with 'Role::HasMessage::Errf'; |
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#pod |
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#pod has payload => ( |
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#pod is => 'ro', |
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#pod isa => 'HashRef', |
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#pod required => 1, |
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#pod ); |
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#pod |
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#pod Then... |
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#pod |
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#pod my $thing = Errfy->new({ |
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#pod message => "%{error_count;error}n encountered at %{when}t", |
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#pod payload => { |
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#pod error_count => 2, |
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#pod when => time, |
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#pod }, |
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#pod }); |
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#pod |
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#pod # prints: 2 errors encountered at 2010-10-20 19:23:42 |
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#pod print $thing->message; |
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#pod |
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#pod =head1 DESCRIPTION |
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#pod |
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#pod Role::HasMessage::Errf is an implementation of L<Role::HasMessage> that uses |
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#pod L<String::Errf> to format C<sprintf>-like message strings. It adds a |
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#pod C<message_fmt> attribute, initialized by the C<message> argument. The value |
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#pod should be a String::Errf format string. |
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#pod |
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#pod When the provided C<message> method is called, it will fill in the format |
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#pod string with the hashref returned by calling the C<payload> method, which I<must |
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#pod be implemented by the including class>. |
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#pod |
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#pod Role::HasMessage::Errf is a L<parameterized role|MooseX::Role::Parameterized>. |
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#pod The C<default> parameter lets you set a default format string or callback. The |
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#pod C<lazy> parameter sets whether or not the C<message_fmt> attribute is lazy. |
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#pod Setting it lazy will require that a default is provided. |
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#pod |
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#pod =cut |
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use String::Errf qw(errf); |
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234907
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use Try::Tiny; |
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use namespace::clean -except => 'meta'; |
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parameter default => ( |
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isa => 'CodeRef|Str', |
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); |
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parameter lazy => ( |
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isa => 'Bool', |
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default => 0, |
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); |
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role { |
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my $p = shift; |
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requires 'payload'; |
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my $msg_default = $p->default; |
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has message_fmt => ( |
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is => 'ro', |
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isa => 'Str', |
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lazy => $p->lazy, |
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required => 1, |
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init_arg => 'message', |
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(defined $msg_default ? (default => $msg_default) : ()), |
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); |
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# The problem with putting this in a cached attribute is that we need to |
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# clear it any time the payload changes. We can do that by making the |
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# Payload trait add a trigger to clear the message, but I haven't done so |
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# yet. -- rjbs, 2010-10-16 |
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# has message => ( |
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# is => 'ro', |
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# lazy => 1, |
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# init_arg => undef, |
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# default => sub { __stringf($_[0]->message_fmt, $_[0]->data) }, |
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# ); |
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method message => sub { |
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my ($self) = @_; |
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return try { |
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errf($self->message_fmt, $self->payload) |
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} catch { |
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sprintf '%s (error during formatting)', $self->message_fmt; |
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} |
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}; |
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with 'Role::HasMessage'; |
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}; |
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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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Role::HasMessage::Errf - a thing with a String::Errf-powered message |
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=head1 VERSION |
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version 0.007 |
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=head1 SYNOPSIS |
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121
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In your class... |
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package Errfy; |
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use Moose; |
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with 'Role::HasMessage::Errf'; |
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has payload => ( |
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is => 'ro', |
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isa => 'HashRef', |
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required => 1, |
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); |
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Then... |
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my $thing = Errfy->new({ |
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message => "%{error_count;error}n encountered at %{when}t", |
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payload => { |
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error_count => 2, |
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when => time, |
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}, |
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}); |
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# prints: 2 errors encountered at 2010-10-20 19:23:42 |
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print $thing->message; |
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=head1 DESCRIPTION |
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149
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Role::HasMessage::Errf is an implementation of L<Role::HasMessage> that uses |
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L<String::Errf> to format C<sprintf>-like message strings. It adds a |
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C<message_fmt> attribute, initialized by the C<message> argument. The value |
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should be a String::Errf format string. |
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When the provided C<message> method is called, it will fill in the format |
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string with the hashref returned by calling the C<payload> method, which I<must |
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be implemented by the including class>. |
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Role::HasMessage::Errf is a L<parameterized role|MooseX::Role::Parameterized>. |
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The C<default> parameter lets you set a default format string or callback. The |
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C<lazy> parameter sets whether or not the C<message_fmt> attribute is lazy. |
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Setting it lazy will require that a default is provided. |
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=head1 PERL VERSION |
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This library should run on perls released even a long time ago. It should work |
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on any version of perl released in the last five years. |
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Although it may work on older versions of perl, no guarantee is made that the |
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minimum required version will not be increased. The version may be increased |
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for any reason, and there is no promise that patches will be accepted to lower |
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the minimum required perl. |
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=head1 AUTHOR |
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Ricardo Signes <cpan@semiotic.systems> |
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2022 by Ricardo Signes. |
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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=cut |