/usr/share/perl5/Mojo/Exception.pm is in libmojolicious-perl 2.23-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use Mojo::Base -base;
use overload
'bool' => sub {1},
'""' => sub { shift->to_string },
fallback => 1;
use IO::File;
use Scalar::Util 'blessed';
has [qw/frames line lines_before lines_after/] => sub { [] };
has [qw/message raw_message/] => 'Exception!';
has verbose => sub { $ENV{MOJO_EXCEPTION_VERBOSE} || 0 };
# "Attempted murder? Now honestly, what is that?
# Do they give a Nobel Prize for attempted chemistry?"
sub new {
my $self = shift->SUPER::new();
# Message
return $self unless @_;
# Detect
return $self->_detect(@_);
}
sub throw {
my $self = shift;
my $e = Mojo::Exception->new;
$e->trace(2);
die $e->_detect(@_);
}
sub trace {
my ($e, $start) = @_;
$start //= 1;
# Trace
my @frames;
while (my ($p, $f, $l) = caller($start++)) {
push @frames, [$p, $f, $l];
# Line
if (-r $f) {
next unless my $handle = IO::File->new("< $f");
my @lines = <$handle>;
push @{$frames[-1]}, $lines[$l - 1];
}
}
$e->frames(\@frames);
return $e;
}
sub _detect {
my $self = shift;
# Message
my $message = shift;
return $message if blessed $message && $message->isa('Mojo::Exception');
$self->message($message);
$self->raw_message($message);
# Trace name and line
my @trace;
while ($message =~ /at\s+(.+?)\s+line\s+(\d+)/g) {
push @trace, {file => $1, line => $2};
}
# Stacktrace
if (my $first = $self->frames->[0]) {
unshift @trace, {file => $first->[1], line => $first->[2]}
if $first->[1];
}
# Frames
foreach my $frame (reverse @trace) {
my $file = $frame->{file};
my $line = $frame->{line};
# Readable
if (-r $file) {
# Slurp
my $handle = IO::File->new($file, '<:utf8');
my @lines = <$handle>;
# Line
$self->_parse_context($line, [\@lines]);
return $self;
}
}
# Parse specific file
return $self unless my $files = shift;
my @lines;
for my $lines (@$files) { push @lines, [split /\n/, $lines] }
# Clean up plain messages
return $self unless my $name = shift;
unless (ref $message) {
my $filter = sub {
my $num = shift;
my $new = "$name line $num";
my $line = $lines[0]->[$num];
$new .= qq/, near "$line"/ if defined $line;
$new .= '.';
return $new;
};
$message =~ s/\(eval\s+\d+\) line (\d+).*/$filter->($1)/ge;
$self->message($message);
}
# Parse message
$name = quotemeta $name;
my $line;
$line = $1 if $self->message =~ /at\s+$name\s+line\s+(\d+)/;
# Stacktrace
unless ($line) {
for my $frame (@{$self->frames}) {
if ($frame->[1] =~ /^\(eval\ \d+\)$/) {
$line = $frame->[2];
last;
}
}
}
# Context
$self->_parse_context($line, \@lines) if $line;
return $self;
}
# "You killed zombie Flanders!
# He was a zombie?"
sub to_string {
my $self = shift;
# Message only
return $self->message unless $self->verbose;
# Start with message
my $string = '';
$string .= $self->message if $self->message;
# Before
for my $line (@{$self->lines_before}) {
$string .= $line->[0] . ': ' . $line->[1] . "\n";
}
# Line
$string .= ($self->line->[0] . ': ' . $self->line->[1] . "\n")
if $self->line->[0];
# After
for my $line (@{$self->lines_after}) {
$string .= $line->[0] . ': ' . $line->[1] . "\n";
}
return $string;
}
sub _parse_context {
my ($self, $line, $lines) = @_;
# Wrong file
return unless defined $lines->[0]->[$line - 1];
# Context
$self->line([$line]);
for my $l (@$lines) {
my $code = $l->[$line - 1];
chomp $code;
push @{$self->line}, $code;
}
# Cleanup
$self->lines_before([]);
$self->lines_after([]);
# Before
for my $i (2 .. 6) {
my $previous = $line - $i;
last if $previous < 0;
if (defined($lines->[0]->[$previous])) {
unshift @{$self->lines_before}, [$previous + 1];
for my $l (@$lines) {
my $code = $l->[$previous];
chomp $code;
push @{$self->lines_before->[0]}, $code;
}
}
}
# After
for my $i (0 .. 4) {
my $next = $line + $i;
next if $next < 0;
if (defined($lines->[0]->[$next])) {
push @{$self->lines_after}, [$next + 1];
for my $l (@$lines) {
next unless defined(my $code = $l->[$next]);
chomp $code;
push @{$self->lines_after->[-1]}, $code;
}
}
}
return $self;
}
1;
__END__
=head1 NAME
Mojo::Exception - Exceptions with context
=head1 SYNOPSIS
use Mojo::Exception;
my $e = Mojo::Exception->new;
=head1 DESCRIPTION
L<Mojo::Exception> is a container for exceptions with context information.
=head1 ATTRIBUTES
L<Mojo::Exception> implements the following attributes.
=head2 C<frames>
my $frames = $e->frames;
$e = $e->frames($frames);
Stacktrace.
=head2 C<line>
my $line = $e->line;
$e = $e->line([3, 'foo']);
The line where the exception occured.
=head2 C<lines_after>
my $lines = $e->lines_after;
$e = $e->lines_after([[1, 'bar'], [2, 'baz']]);
Lines after the line where the exception occured.
=head2 C<lines_before>
my $lines = $e->lines_before;
$e = $e->lines_before([[4, 'bar'], [5, 'baz']]);
Lines before the line where the exception occured.
=head2 C<message>
my $message = $e->message;
$e = $e->message('Oops!');
Exception message.
=head2 C<raw_message>
my $message = $e->raw_message;
$e = $e->raw_message('Oops!');
Raw unprocessed exception message.
=head2 C<verbose>
my $verbose = $e->verbose;
$e = $e->verbose(1);
Activate verbose rendering.
=head1 METHODS
L<Mojo::Exception> inherits all methods from L<Mojo::Base> and implements the
following new ones.
=head2 C<new>
my $e = Mojo::Exception->new('Oops!');
my $e = Mojo::Exception->new('Oops!', $files, $name);
Construct a new L<Mojo::Exception> object.
=head2 C<throw>
Mojo::Exception->throw('Oops!');
Mojo::Exception->throw('Oops!', $files, $name);
Throw exception with stacktrace.
=head2 C<trace>
$e = $e->trace;
Perform stacktrace.
=head2 C<to_string>
my $string = $e->to_string;
my $string = "$e";
Render exception with context.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
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