This file is indexed.

/usr/share/perl5/HTML/Mason/Exceptions.pm is in libhtml-mason-perl 1:1.58-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
package HTML::Mason::Exceptions;
$HTML::Mason::Exceptions::VERSION = '1.58';
use strict;
use warnings;

my %e;

BEGIN
{
    %e = ( 'HTML::Mason::Exception' =>
           { description => 'generic base class for all Mason exceptions',
             alias => 'error'},

           'HTML::Mason::Exception::Abort' =>
           { isa => 'HTML::Mason::Exception',
             fields => [qw(aborted_value)],
             description => 'a component called $m->abort' },

           'HTML::Mason::Exception::Decline' =>
           { isa => 'HTML::Mason::Exception',
             fields => [qw(declined_value)],
             description => 'a component called $m->decline' },

           'HTML::Mason::Exception::Compiler' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'compiler_error',
             description => 'error thrown from the compiler' },

           'HTML::Mason::Exception::Compilation' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'compilation_error',
             fields => [qw(filename)],
             description => "error thrown in eval of the code for a component" },

           'HTML::Mason::Exception::Compilation::IncompatibleCompiler' =>
           { isa => 'HTML::Mason::Exception::Compilation',
             alias => 'wrong_compiler_error',
             description => "a component was compiled by a compiler/lexer with incompatible options.  recompilation is needed" },

           'HTML::Mason::Exception::Params' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'param_error',
             description => 'invalid parameters were given to a method/function' },

           'HTML::Mason::Exception::Syntax' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'syntax_error',
             fields => [qw(source_line comp_name line_number)],
             description => 'invalid syntax was found in a component' },

           'HTML::Mason::Exception::System' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'system_error',
             description => 'a system call of some sort failed' },

           'HTML::Mason::Exception::TopLevelNotFound' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'top_level_not_found_error',
             description => 'the top level component could not be found' },

           'HTML::Mason::Exception::VirtualMethod' =>
           { isa => 'HTML::Mason::Exception',
             alias => 'virtual_error',
             description => 'a virtual method was not overridden' },

         );
}

use Exception::Class (%e);

HTML::Mason::Exception->Trace(1);

# To avoid circular reference between exception and request.
HTML::Mason::Exception->NoRefs(1);

# The import() method allows this:
#  use HTML::Mason::Exceptions(abbr => ['error1', 'error2', ...]);
# ...
#  error1 "something went wrong";

sub import
{
    my ($class, %args) = @_;

    my $caller = caller;
    if ($args{abbr})
    {
        foreach my $name (@{$args{abbr}})
        {
            no strict 'refs';
            die "Unknown exception abbreviation '$name'" unless defined &{$name};
            *{"${caller}::$name"} = \&{$name};
        }
    }
    {
        no strict 'refs';
        *{"${caller}::isa_mason_exception"} = \&isa_mason_exception;
        *{"${caller}::rethrow_exception"} = \&rethrow_exception;
    }
}

sub isa_mason_exception
{
    my ($err, $name) = @_;
    return unless defined $err;

    $name = $name ? "HTML::Mason::Exception::$name" : "HTML::Mason::Exception";
    no strict 'refs';
    die "no such exception class $name" unless $name->isa('HTML::Mason::Exception');

    return UNIVERSAL::isa($err, $name);
}

sub rethrow_exception
{
    my ($err) = @_;
    return unless $err;

    if ( UNIVERSAL::can($err, 'rethrow') ) {
        $err->rethrow;
    }
    elsif ( ref $err ) {
        die $err;
    }
    HTML::Mason::Exception->throw(error => $err);
}

package HTML::Mason::Exception;
$HTML::Mason::Exception::VERSION = '1.58';
use HTML::Mason::MethodMaker
    ( read_write => [ qw ( format ) ] );

sub new
{
    my ($class, %params) = @_;

    my $self = $class->SUPER::new(%params);
    $self->format('text');
    return $self;
}

# If we create a new exception from a Mason exception, just use the
# short error message, not the stringified exception. Otherwise
# exceptions can get stringified more than once.
sub throw
{
    my $class = shift;
    my %params = @_ == 1 ? ( error => $_[0] ) : @_;

    if (HTML::Mason::Exceptions::isa_mason_exception($params{error})) {
        $params{error} = $params{error}->error;
    }
    if (HTML::Mason::Exceptions::isa_mason_exception($params{message})) {
        $params{message} = $params{message}->error;
    }
    $class->SUPER::throw(%params);
}

sub filtered_frames
{
    my ($self) = @_;

    my (@frames);
    my $trace = $self->trace;
    my %ignore_subs = map { $_ => 1 }
        qw[
           (eval)
           Exception::Class::Base::throw
           Exception::Class::__ANON__
           HTML::Mason::Commands::__ANON__
           HTML::Mason::Component::run
           HTML::Mason::Exception::throw
           HTML::Mason::Exceptions::__ANON__
           HTML::Mason::Request::_run_comp
           ];
    while (my $frame = $trace->next_frame)
    {
        last if ($frame->subroutine eq 'HTML::Mason::Request::exec');
        unless ($frame->filename =~ /Mason\/Exceptions\.pm/ or
                $ignore_subs{ $frame->subroutine } or
                ($frame->subroutine eq 'HTML::Mason::Request::comp' and $frame->filename =~ /Request\.pm/)) {
            push(@frames, $frame);
        }
    }
    @frames = grep { $_->filename !~ /Mason\/Exceptions\.pm/ } $trace->frames if !@frames;
    return @frames;
}

sub analyze_error
{
    my ($self) = @_;
    my ($file, @lines, @frames);

    return $self->{_info} if $self->{_info};

    @frames = $self->filtered_frames;
    if ($self->isa('HTML::Mason::Exception::Syntax')) {
        $file = $self->comp_name;
        push(@lines, $self->line_number);
    } elsif ($self->isa('HTML::Mason::Exception::Compilation')) {
        $file = $self->filename;
        my $msg = $self->full_message;
        while ($msg =~ /at .* line (\d+)./g) {
            push(@lines, $1);
        }
    } elsif (@frames) {
        $file = $frames[0]->filename;
        @lines = $frames[0]->line;
    }
    my @context;
    @context = $self->get_file_context($file, \@lines) if @lines;

    $self->{_info} = {
        file    => $file,
        frames  => \@frames,
        lines   => \@lines,
        context => \@context,
    };
    return $self->{_info};
}

sub get_file_context
{
    my ($self, $file, $line_nums) = @_;

    my @context;
    my $fh = do { local *FH; *FH; };
    unless (defined($file) and open($fh, $file)) {
        @context = (['unable to open file', '']);
    } else {
        # Put the file into a list, indexed at 1.
        my @file = <$fh>;
        chomp(@file);
        unshift(@file, undef);

        # Mark the important context lines.
        # We do this by going through the error lines and incrementing hash keys to
        # keep track of which lines we eventually need to print, and we color the
        # line which the error actually occured on in red.
        my (%marks, %red);
        my $delta = 4;
        foreach my $line_num (@$line_nums) {
            foreach my $l (($line_num - $delta) .. ($line_num + $delta)) {
                next if ($l <= 0 or $l > @file);
                $marks{$l}++;
            }
            $red{$line_num} = 1;
        }

        # Create the context list.
        # By going through the keys of the %marks hash, we can tell which lines need
        # to be printed. We add a '...' line if we skip numbers in the context.
        my $last_num = 0;
        foreach my $line_num (sort { $a <=> $b } keys %marks) {
            push(@context, ["...", "", 0]) unless $last_num == ($line_num - 1);
            push(@context, ["$line_num:", $file[$line_num], $red{$line_num}]);;
            $last_num = $line_num;
        }
        push(@context, ["...", "", 0]) unless $last_num == @file;
        close $fh;
    }
    return @context;
}

# basically the same as as_string in Exception::Class::Base
sub raw_text
{
    my ($self) = @_;

    return $self->full_message . "\n\n" . $self->trace->as_string;
}

sub as_string
{
    my ($self) = @_;

    my $stringify_function = "as_" . $self->{format};
    return $self->$stringify_function();
}

sub as_brief
{
    my ($self) = @_;
    return $self->full_message;
}

sub as_line
{
    my ($self) = @_;
    my $info = $self->analyze_error;

    (my $msg = $self->full_message) =~ s/\n/\t/g;
    my $stack = join(", ", map { sprintf("[%s:%d]", $_->filename, $_->line) } @{$info->{frames}});
    return sprintf("%s\tStack: %s\n", $msg, $stack);
}

sub as_text
{
    my ($self) = @_;
    my $info = $self->analyze_error;

    my $msg = $self->full_message;
    my $stack = join("\n", map { sprintf("  [%s:%d]", $_->filename, $_->line) } @{$info->{frames}});
    return sprintf("%s\nStack:\n%s\n", $msg, $stack);
}

sub as_html
{
    my ($self) = @_;

    my $out;
    my $interp = HTML::Mason::Interp->new(out_method => \$out);

    my $comp = $interp->make_component(comp_source => <<'EOF');

<%args>
 $msg
 $info
 $error
</%args>
<%filter>
 s/(<td [^\>]+>)/$1<font face="Verdana, Arial, Helvetica, sans-serif" size="-2">/g;
 s/<\/td>/<\/font><\/td>/g;
</%filter>

% HTML::Mason::Escapes::basic_html_escape(\$msg);
% $msg =~ s/\n/<br>/g;

<html><body>

<p align="center"><font face="Verdana, Arial, Helvetica, sans-serif"><b>System error</b></font></p>
<table border="0" cellspacing="0" cellpadding="1">
 <tr>
  <td nowrap="nowrap" align="left" valign="top"><b>error:</b>&nbsp;</td>
  <td align="left" valign="top"><% $msg %></td>
 </tr>
 <tr>
  <td nowrap="nowrap" align="left" valign="top"><b>context:</b>&nbsp;</td>
  <td align="left" valign="top" nowrap="nowrap">
   <table border="0" cellpadding="0" cellspacing="0">

%   foreach my $entry (@{$info->{context}}) {
%       my ($line_num, $line, $highlight) = @$entry;
%       $line = '' unless defined $line;
%       HTML::Mason::Escapes::basic_html_escape(\$line);
    <tr>
     <td nowrap="nowrap" align="left" valign="top"><b><% $line_num %></b>&nbsp;</td>
     <td align="left" valign="top" nowrap="nowrap"><% $highlight ? "<font color=red>" : "" %><% $line %><% $highlight ? "</font>" : "" %></td>
    </tr>

%    }

   </table>
  </td>
 </tr>
 <tr>
  <td align="left" valign="top" nowrap="nowrap"><b>code stack:</b>&nbsp;</td>
  <td align="left" valign="top" nowrap="nowrap">
%    foreach my $frame (@{$info->{frames}}) {
%        my $f = $frame->filename; HTML::Mason::Escapes::basic_html_escape(\$f);
%        my $l = $frame->line; HTML::Mason::Escapes::basic_html_escape(\$l);
        <% $f %>:<% $l %><br>
%    }
  </td>
 </tr>
</table>

<a href="#raw">raw error</a><br>

<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>

% my $raw = $error->raw_text;
% HTML::Mason::Escapes::basic_html_escape(\$raw);
% $raw =~ s/\t//g;

<a name="raw"></a>

<pre><% $raw %></pre>

</body></html>
EOF

    $interp->exec($comp,
                  msg => $self->full_message,
                  info => $self->analyze_error,
                  error => $self);

    return $out;
}

package HTML::Mason::Exception::Compilation;
$HTML::Mason::Exception::Compilation::VERSION = '1.58';
sub full_message
{
    my $self = shift;

    return sprintf("Error during compilation of %s:\n%s\n", $self->filename || '', $self->message || '');
}

package HTML::Mason::Exception::Syntax;
$HTML::Mason::Exception::Syntax::VERSION = '1.58';
sub full_message
{
    my $self = shift;

    return sprintf("%s at %s line %d", $self->message || '', $self->comp_name || '', $self->line_number);
}

1;

__END__

=head1 NAME

HTML::Mason::Exceptions - Exception objects thrown by Mason

=head1 SYNOPSIS

  use HTML::Mason::Exceptions ( abbr => [ qw(system_error) ] );

  open FH, 'foo' or system_error "cannot open foo: $!";

=head1 DESCRIPTION

This module creates the hierarchy of exception objects used by Mason,
and provides some extra methods for them beyond those provided by
C<Exception::Class>

=head1 IMPORT

When this module is imported, it is possible to specify a list of
abbreviated function names that you want to use to throw exceptions.
In the L<SYNOPSIS|/SYNOPSIS> example, we use the C<system_error>
function to throw a C<HTML::Mason::Exception::System> exception.

These abbreviated functions do not allow you to set additional fields
in the exception, only the message.

=head1 EXCEPTIONS

=over

=item HTML::Mason::Exception

This is the parent class for all exceptions thrown by Mason.  Mason
sometimes throws exceptions in this class when we could not find a
better category for the message.

Abbreviated as C<error>

=item HTML::Mason::Exception::Abort

The C<< $m->abort >> method was called.

Exceptions in this class contain the field C<aborted_value>.

=item HTML::Mason::Exception::Decline

The C<< $m->decline >> method was called.

Exceptions in this class contain the field C<declined_value>.

=item HTML::Mason::Exception::Compilation

An exception occurred when attempting to C<eval> an existing object
file.

Exceptions in this class have the field C<filename>, which indicates
what file contained the code that caused the error.

Abbreviated as C<compilation_error>.

=item HTML::Mason::Exception::Compiler

The compiler threw an exception because it received incorrect input.
For example, this would be thrown if the lexer told the compiler to
initialize compilation while it was in the middle of compiling another
component.

Abbreviated as C<compiler_error>.

=item HTML::Mason::Exception::Compilation::IncompatibleCompiler

A component was compiled by a compiler or lexer with incompatible
options.  This is used to tell Mason to recompile a component.

Abbreviated as C<wrong_compiler_error>.

=item HTML::Mason::Exception::Params

Invalid parameters were passed to a method or function.

Abbreviated as C<param_error>.

=item HTML::Mason::Exception::Syntax

This exception indicates that a component contained invalid syntax.

Exceptions in this class have the fields C<source_line>, which is the
actual source where the error was found, C<comp_name>, and
C<line_number>.

Abbreviated as C<syntax_error>.

=item HTML::Mason::Exception::System

A system call of some sort, such as a file open, failed.

Abbreviated as C<system_error>.

=item HTML::Mason::Exception::TopLevelNotFound

The requested top level component could not be found.

Abbreviated as C<top_level_not_found_error>.

=item HTML::Mason::VirtualMethod

Some piece of code attempted to call a virtual method which was not
overridden.

Abbreviated as C<virtual_error>

=back

=head1 FIELDS

Some of the exceptions mentioned above have additional fields, which
are available via accessors.  For example, to get the line number of
an C<HTML::Mason::Exception::Syntax> exception, you call the
C<line_number> method on the exception object.

=head1 EXCEPTION METHODS

All of the Mason exceptions implement the following methods:

=over

=item as_brief

This simply returns the exception message, without any trace information.

=item as_line

This returns the exception message and its trace information, all on a
single line with tabs between the message and each frame of the stack
trace.

=item as_text

This returns the exception message and stack information, with each
frame on a separate line.

=item as_html

This returns the exception message and stack as an HTML page.

=back

Each of these methods corresponds to a valid error_format parameter
for the L<Request object|HTML::Mason::Request> such as C<text> or
C<html>.

You can create your own method in the C<HTML::Mason::Exception>
namespace, such as C<as_you_wish>, in which case you could set this
parameter to "you_wish".  This method will receive a single argument,
the exception object, and is expected to return some sort of string
containing the formatted error message.

=head1 EXCEPTION CLASS CHECKING

This module also exports the C<isa_mason_exception> function.  This
function takes the exception object and an optional string parameter
indicating what subclass to check for.

So it can be called either as:

  if ( isa_mason_exception($@) ) { ... }

or

  if ( isa_mason_exception($@, 'Syntax') ) { ... }

Note that when specifying a subclass you should not include the
leading "HTML::Mason::Exception::" portion of the class name.

=cut