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/usr/share/perl5/Test2/EventFacet/Trace.pm is in libtest-simple-perl 1.302125-1.

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package Test2::EventFacet::Trace;
use strict;
use warnings;

our $VERSION = '1.302125';

BEGIN { require Test2::EventFacet; our @ISA = qw(Test2::EventFacet) }

use Test2::Util qw/get_tid pkg_to_file/;
use Carp qw/confess/;

use Test2::Util::HashBase qw{^frame ^pid ^tid ^cid -hid -nested details -buffered};

{
    no warnings 'once';
    *DETAIL = \&DETAILS;
    *detail = \&details;
    *set_detail = \&set_details;
}

sub init {
    confess "The 'frame' attribute is required"
        unless $_[0]->{+FRAME};

    $_[0]->{+DETAILS} = delete $_[0]->{detail} if $_[0]->{detail};

    $_[0]->{+PID} = $$        unless defined $_[0]->{+PID};
    $_[0]->{+TID} = get_tid() unless defined $_[0]->{+TID};
}

sub snapshot {
    my ($orig, @override) = @_;
    bless {%$orig, @override}, __PACKAGE__;
}

sub signature {
    my $self = shift;

    # Signature is only valid if all of these fields are defined, there is no
    # signature if any is missing. '0' is ok, but '' is not.
    return join ':' => map { (defined($_) && length($_)) ? $_ : return undef } (
        $self->{+CID},
        $self->{+PID},
        $self->{+TID},
        $self->{+FRAME}->[1],
        $self->{+FRAME}->[2],
    );
}

sub debug {
    my $self = shift;
    return $self->{+DETAILS} if $self->{+DETAILS};
    my ($pkg, $file, $line) = $self->call;
    return "at $file line $line";
}

sub alert {
    my $self = shift;
    my ($msg) = @_;
    warn $msg . ' ' . $self->debug . ".\n";
}

sub throw {
    my $self = shift;
    my ($msg) = @_;
    die $msg . ' ' . $self->debug . ".\n";
}

sub call { @{$_[0]->{+FRAME}} }

sub package { $_[0]->{+FRAME}->[0] }
sub file    { $_[0]->{+FRAME}->[1] }
sub line    { $_[0]->{+FRAME}->[2] }
sub subname { $_[0]->{+FRAME}->[3] }

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Test2::EventFacet::Trace - Debug information for events

=head1 DESCRIPTION

The L<Test2::API::Context> object, as well as all L<Test2::Event> types need to
have access to information about where they were created.  This object
represents that information.

=head1 SYNOPSIS

    use Test2::EventFacet::Trace;

    my $trace = Test2::EventFacet::Trace->new(
        frame => [$package, $file, $line, $subname],
    );

=head1 FACET FIELDS

=over 4

=item $string = $trace->{details}

=item $string = $trace->details()

Used as a custom trace message that will be used INSTEAD of
C<< at <FILE> line <LINE> >> when calling C<< $trace->debug >>.

=item $frame = $trace->{frame}

=item $frame = $trace->frame()

Get the call frame arrayref.

=item $int = $trace->{pid}

=item $int = $trace->pid()

The process ID in which the event was generated.

=item $int = $trace->{tid}

=item $int = $trace->tid()

The thread ID in which the event was generated.

=item $id = $trace->{cid}

=item $id = $trace->cid()

The ID of the context that was used to create the event.

=item $hid = $trace->{hid}

=item $hid = $trace->hid()

The ID of the hub that was current when the event was created.

=item $int = $trace->{nested}

=item $int = $trace->nested()

How deeply nested the event is.

=item $bool = $trace->{buffered}

=item $bool = $trace->buffered()

True if the event was buffered and not sent to the formatter independent of a
parent (This should never be set when nested is C<0> or C<undef>).

=back

=head1 METHODS

B<Note:> All facet frames are also methods.

=over 4

=item $trace->set_detail($msg)

=item $msg = $trace->detail

Used to get/set a custom trace message that will be used INSTEAD of
C<< at <FILE> line <LINE> >> when calling C<< $trace->debug >>.

C<detail()> is an alias to the C<details> facet field for backwards
compatibility.

=item $str = $trace->debug

Typically returns the string C<< at <FILE> line <LINE> >>. If C<detail> is set
then its value will be returned instead.

=item $trace->alert($MESSAGE)

This issues a warning at the frame (filename and line number where
errors should be reported).

=item $trace->throw($MESSAGE)

This throws an exception at the frame (filename and line number where
errors should be reported).

=item ($package, $file, $line, $subname) = $trace->call()

Get the caller details for the debug-info. This is where errors should be
reported.

=item $pkg = $trace->package

Get the debug-info package.

=item $file = $trace->file

Get the debug-info filename.

=item $line = $trace->line

Get the debug-info line number.

=item $subname = $trace->subname

Get the debug-info subroutine name.

=item $sig = trace->signature

Get a signature string that identifies this trace. This is used to check if
multiple events are related. The Trace includes pid, tid, file, line number,
and the cid which is C<'C\d+'> for traces created by a context, or C<'T\d+'>
for traces created by C<new()>.

=back

=head1 SOURCE

The source code repository for Test2 can be found at
F<http://github.com/Test-More/test-more/>.

=head1 MAINTAINERS

=over 4

=item Chad Granum E<lt>exodist@cpan.orgE<gt>

=back

=head1 AUTHORS

=over 4

=item Chad Granum E<lt>exodist@cpan.orgE<gt>

=back

=head1 COPYRIGHT

Copyright 2018 Chad Granum E<lt>exodist@cpan.orgE<gt>.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

See F<http://dev.perl.org/licenses/>

=cut