xref: /freebsd/contrib/libxo/xolint/xolint.pl (revision ce6a89e27cd190313be39bb479880aeda4778436) 
1#!/usr/bin/env perl
2#
3# Copyright (c) 2014, Juniper Networks, Inc.
4# All rights reserved.
5# This SOFTWARE is licensed under the LICENSE provided in the
6# ../Copyright file. By downloading, installing, copying, or otherwise
7# using the SOFTWARE, you agree to be bound by the terms of that
8# LICENSE.
9# Phil Shafer, August 2014
10#
11#
12# xolint -- a lint for inspecting xo_emit format strings
13#
14# Yes, that's a long way to go for a pun.
15
16%vocabulary = ();
17
18sub main {
19    while ($ARGV[0] =~ /^-/) {
20	$_ = shift @ARGV;
21	$opt_cpp = 1 if /^-c/;
22	$opt_cflags .= shift @ARGV if /^-C/;
23	$opt_debug = 1 if /^-d/;
24	extract_docs() if /^-D/;
25	$opt_info = $opt_vocabulary = 1 if /^-I/;
26	$opt_print = 1 if /^-p/;
27	$opt_vocabulary = 1 if /^-V/;
28	extract_samples() if /^-X/;
29    }
30
31    if ($#ARGV < 0) {
32	print STDERR "xolint [options] files ...\n";
33	print STDERR "    -c    invoke 'cpp' on input\n";
34	print STDERR "    -C flags   Pass flags to cpp\n";
35	print STDERR "    -d         Show debug output\n";
36	print STDERR "    -D         Extract xolint documentation\n";
37	print STDERR "    -I         Print xo_info_t data\n";
38	print STDERR "    -p         Print input data on errors\n";
39	print STDERR "    -V         Print vocabulary (list of tags)\n";
40	print STDERR "    -X         Print examples of invalid use\n";
41	exit(1);
42    }
43
44    for $file (@ARGV) {
45	parse_file($file);
46    }
47
48    if ($opt_info) {
49	print "static xo_info_t xo_info_table[] = {\n";
50	for $name (sort(keys(%vocabulary))) {
51	    print "    { \"", $name, "\", \"type\", \"desc\" },\n";
52	}
53	print "};\n";
54	print "static int xo_info_count = "
55	    . "(sizeof(xo_info_table) / sizeof(xo_info_table[0]));\n\n";
56	print "#define XO_SET_INFO() \\\n";
57	print "    xo_set_info(NULL, xo_info_table, xo_info_count)\n";
58    } elsif ($opt_vocabulary) {
59	for $name (sort(keys(%vocabulary))) {
60	    print $name, "\n";
61	}
62    }
63}
64
65sub extract_samples {
66    my $x = "\#" . "\@";
67    my $cmd = "grep -B1 -i '$x Should be' $0 | grep xo_emit | sed 's/.*\#*\@//'";
68    system($cmd);
69    exit(0);
70}
71
72sub extract_docs {
73    my $x = "\#" . "\@";
74    my $cmd = "grep -B1 '$x' $0";
75    open INPUT, "$cmd |";
76    local @input = <INPUT>;
77    close INPUT;
78    my $ln, $new = 0, $first = 1, $need_nl;
79
80    for ($ln = 0; $ln <= $#input; $ln++) {
81	chomp($_ = $input[$ln]);
82	if (/^--/) {
83	    $ln += 1;
84	    $new = 1;
85	    next;
86	}
87	if ($first) {
88	    $new = 1;
89	    $first = 0;
90	    next;
91	}
92
93	s/\s*\#\@\s*//;
94
95	if ($new) {
96	    if ($need_nl) {
97		print "\n\n";
98		$need_nl = 0;
99	    }
100
101	    $under = "+" x (length($_) + 2);
102
103	    print "'$_'\n$under\n\n";
104	    print "The message \"$_\" can be caused by code like:\n";
105	    $new = 0;
106
107	} elsif (/xo_emit\s*\(/) {
108	    s/^\s+//;
109	    print "\n::\n\n    $_\n\n";
110
111	} elsif (/^Should be/i) {
112	    print "This code should be replaced with code like:\n";
113
114	} else {
115	    print "$_\n";
116	    $need_nl = 1;
117	}
118    }
119
120    exit(0);
121}
122
123sub parse_file {
124    local($file) = @_;
125    local($errors, $warnings, $info) = (0, 0, 0);
126    local $curfile = $file;
127    local $curln = 0;
128
129    if ($opt_cpp) {
130	die "no such file" unless -f $file;
131	open INPUT, "cpp $opt_cflags $file |";
132    } else {
133	open INPUT, $file || die "cannot open input file '$file'";
134    }
135    local @input = <INPUT>;
136    close INPUT;
137
138    local $ln, $rln, $line, $replay;
139
140    for ($ln = 0; $ln < $#input; $ln++) {
141	$line = $input[$ln];
142	$curln += 1;
143
144	if ($line =~ /^\#/) {
145	    my($num, $fn) = ($line =~ /\#\s*(\d+)\s+"(.+)"/);
146	    ($curfile, $curln) = ($fn, $num) if $num;
147	    next;
148	}
149
150	next unless $line =~ /xo_emit\(/;
151
152	@tokens = parse_tokens();
153	print "token:\n    '" . join("'\n    '", @tokens) . "'\n"
154	    if $opt_debug;
155	check_format($tokens[0]);
156    }
157
158    print $file . ": $errors errors, $warnings warnings, $info info\n"
159	unless $opt_vocabulary;
160}
161
162sub parse_tokens {
163    my $full = "$'";
164    my @tokens = ();
165    my %pairs = ( "{" => "}", "[" => "]", "(" => ")" );
166    my %quotes = ( "\"" => "\"", "'" => "'" );
167    local @data = split(//, $full);
168    local @open = ();
169    local $current = "";
170    my $quote = "";
171    local $off = 0;
172    my $ch;
173
174    $replay = $curln . "     " . $line;
175    $rln = $ln + 1;
176
177    for (;;) {
178	get_tokens() if $off > $#data;
179	die "out of data" if $off > $#data;
180	$ch = $data[$off++];
181
182	print "'$ch' ($quote) ($#open) [" . join("", @open) . "]\n"
183	    if $opt_debug;
184
185	last if $ch eq ";" && $#open < 0;
186
187	if ($ch eq "," && $quote eq "" && $#open < 0) {
188	    print "[$current]\n" if $opt_debug;
189	    push @tokens, $current;
190	    $current = "";
191	    next;
192	}
193
194	next if $ch =~ /[ \t\n\r]/ && $quote eq "" && $#open < 0;
195
196	$current .= $ch;
197
198	if ($quote) {
199	    if ($ch eq $quote) {
200		$quote = "";
201	    }
202	    next;
203	}
204	if ($quotes{$ch}) {
205	    $quote = $quotes{$ch};
206	    $current = substr($current, 0, -2) if $current =~ /""$/;
207	    next;
208	}
209
210	if ($pairs{$ch}) {
211	    push @open, $pairs{$ch};
212	    next;
213	}
214
215	if ($#open >= 0 && $ch eq $open[$#open]) {
216	    pop @open;
217	    next;
218	}
219    }
220
221    push @tokens, substr($current, 0, -1);
222    return @tokens;
223}
224
225sub get_tokens {
226    if ($ln + 1 < $#input) {
227	$line = $input[++$ln];
228	$curln += 1;
229	$replay .= $curln . "     " . $line;
230	@data = split(//, $line);
231	$off = 0;
232    }
233}
234
235sub check_format {
236    my($format) = @_;
237
238    return unless $format =~ /^".*"$/;
239
240    my @data = split(//, $format);
241    my $ch;
242    my $braces = 0;
243    local $count = 0;
244    my $content = "";
245    my $off;
246    my $phase = 0;
247    my @build = ();
248    local $last, $prev = "";
249
250    # Nukes quotes
251    pop @data;
252    shift @data;
253
254    for (;;) {
255	last if $off > $#data;
256	$ch = $data[$off++];
257
258	if ($ch eq "\\") {
259	    $ch = $data[$off++];
260	    $off += 1 if $ch eq "\\"; # double backslash: "\\/"
261	    next;
262	}
263
264	if ($braces) {
265	    if ($ch eq "}") {
266		check_field(@build);
267		$braces = 0;
268		@build = ();
269		$phase = 0;
270		next;
271	    } elsif ($phase == 0 && $ch eq ":") {
272		$phase += 1;
273		next;
274	    } elsif ($ch eq "/") {
275		$phase += 1;
276		next;
277	    }
278
279	} else {
280	    if ($ch eq "{") {
281		check_text($build[0]) if length($build[0]);
282		$braces = 1;
283		@build = ();
284		$last = $prev;
285		next;
286	    }
287	    $prev = $ch;
288	}
289
290	$build[$phase] .= $ch;
291    }
292
293    if ($braces) {
294	error("missing closing brace");
295	check_field(@build);
296    } else {
297	check_text($build[0]) if length($build[0]);
298    }
299}
300
301sub check_text {
302    my($text) = @_;
303
304    print "checking text: [$text]\n" if $opt_debug;
305
306    #@ A percent sign appearing in text is a literal
307    #@     xo_emit("cost: %d", cost);
308    #@ Should be:
309    #@     xo_emit("{L:cost}: {:cost/%d}", cost);
310    #@ This can be a bit surprising and could be a field that was not
311    #@ properly converted to a libxo-style format string.
312    info("a percent sign appearing in text is a literal") if $text =~ /%/;
313}
314
315%short = (
316    # Roles
317    "color" => "C",
318    "decoration" => "D",
319    "error" => "E",
320    "label" => "L",
321    "note" => "N",
322    "padding" => "P",
323    "title" => "T",
324    "units" => "U",
325    "value" => "V",
326    "warning" => "W",
327    "start-anchor" => "[",
328    "stop-anchor" => "]",
329    # Modifiers
330    "colon" => "c",
331    "display" => "d",
332    "encoding" => "e",
333    "hn" => "h",
334    "hn-decimal" => "@",
335    "hn-space" => "@",
336    "hn-1000" => "@",
337    "humanize" => "h",
338    "key" => "k",
339    "leaf-list" => "l",
340    "no-quotes" => "n",
341    "quotes" => "q",
342    "trim" => "t",
343    "white" => "w",
344 );
345
346sub check_field {
347    my(@field) = @_;
348    print "checking field: [" . join("][", @field) . "]\n" if $opt_debug;
349
350    if ($field[0] =~ /,/) {
351	# We have long names; deal with it by turning them into short names
352	my @parts = split(/,/, $field[0]);
353	my $new = "";
354	for (my $i = 1; $i <= $#parts; $i++) {
355	    my $v = $parts[$i];
356	    $v =~ s/^\s+//;
357	    $v =~ s/\s+$//;
358	    if ($short{$v} eq "@") {
359		# ignore; has no short version
360	    } elsif ($short{$v}) {
361		$new .= $short{$v};
362	    } else {
363		#@ Unknown long name for role/modifier
364		#@   xo_emit("{,humanization:value}", value);
365		#@ Should be:
366		#@   xo_emit("{,humanize:value}", value);
367		#@ The hn-* modifiers (hn-decimal, hn-space, hn-1000)
368		#@ are only valid for fields with the {h:} modifier.
369		error("Unknown long name for role/modifier ($v)");
370	    }
371	}
372
373	$field[4] = substr($field[0], index($field[0], ","));
374	$field[0] = $parts[0] . $new;
375    }
376
377    if ($opt_vocabulary) {
378	$vocabulary{$field[1]} = 1
379	    if $field[1] && $field[0] !~ /[DELNPTUW\[\]]/;
380	return;
381    }
382
383    #@ Last character before field definition is a field type
384    #@ A common typo:
385    #@     xo_emit("{T:Min} T{:Max}");
386    #@ Should be:
387    #@     xo_emit("{T:Min} {T:Max}");
388    #@ Twiddling the "{" and the field role is a common typo.
389    info("last character before field definition is a field type ($last)")
390	if $last =~ /[DELNPTUVW\[\]]/ && $field[0] !~ /[DELNPTUVW\[\]]/;
391
392    #@ Encoding format uses different number of arguments
393    #@     xo_emit("{:name/%6.6s %%04d/%s}", name, number);
394    #@ Should be:
395    #@     xo_emit("{:name/%6.6s %04d/%s-%d}", name, number);
396    #@ Both format should consume the same number of arguments off the stack
397    my $cf = count_args($field[2]);
398    my $ce = count_args($field[3]);
399    warn("encoding format uses different number of arguments ($cf/$ce)")
400	if $ce >= 0 && $cf >= 0 && $ce != $cf;
401
402    #@ Only one field role can be used
403    #@     xo_emit("{LT:Max}");
404    #@ Should be:
405    #@     xo_emit("{T:Max}");
406    my(@roles) = ($field[0] !~ /([DELNPTUVW\[\]]).*([DELNPTUVW\[\]])/);
407    error("only one field role can be used (" . join(", ", @roles) . ")")
408	if $#roles > 0;
409
410    # Field is a color, note, label, or title
411    if ($field[0] =~ /[CDLNT]/) {
412
413	#@ Potential missing slash after C, D, N, L, or T with format
414	#@     xo_emit("{T:%6.6s}\n", "Max");
415	#@ should be:
416	#@     xo_emit("{T:/%6.6s}\n", "Max");
417	#@ The "%6.6s" will be a literal, not a field format.  While
418	#@ it's possibly valid, it's likely a missing "/".
419	info("potential missing slash after C, D, N, L, or T with format")
420	    if $field[1] =~ /%/;
421
422	#@ An encoding format cannot be given (roles: DNLT)
423	#@    xo_emit("{T:Max//%s}", "Max");
424	#@ Fields with the C, D, N, L, and T roles are not emitted in
425	#@ the 'encoding' style (JSON, XML), so an encoding format
426	#@ would make no sense.
427	error("encoding format cannot be given when content is present")
428	    if $field[3];
429    }
430
431    # Field is a color, decoration, label, or title
432    if ($field[0] =~ /[CDLN]/) {
433	#@ Format cannot be given when content is present (roles: CDLN)
434	#@    xo_emit("{N:Max/%6.6s}", "Max");
435	#@ Fields with the C, D, L, or N roles can't have both
436	#@ static literal content ("{L:Label}") and a
437	#@ format ("{L:/%s}").
438	#@ This error will also occur when the content has a backslash
439	#@ in it, like "{N:Type of I/O}"; backslashes should be escaped,
440	#@ like "{N:Type of I\\/O}".  Note the double backslash, one for
441	#@ handling 'C' strings, and one for libxo.
442	error("format cannot be given when content is present")
443	    if $field[1] && $field[2];
444    }
445
446    # Field is a color/effect
447    if ($field[0] =~ /C/) {
448	if ($field[1]) {
449	    my $val;
450	    my @sub = split(/,/, $field[1]);
451	    grep { s/^\s*//; s/\s*$//; } @sub;
452
453	    for $val (@sub) {
454		if ($val =~ /^(default,black,red,green,yellow,blue,magenta,cyan,white)$/) {
455
456		    #@ Field has color without fg- or bg- (role: C)
457		    #@   xo_emit("{C:green}{:foo}{C:}", x);
458		    #@ Should be:
459		    #@   xo_emit("{C:fg-green}{:foo}{C:}", x);
460		    #@ Colors must be prefixed by either "fg-" or "bg-".
461		    error("Field has color without fg- or bg- (role: C)");
462
463		} elsif ($val =~ /^(fg|bg)-(default|black|red|green|yellow|blue|magenta|cyan|white)$/) {
464		    # color
465		} elsif ($val =~ /^(bold|underline)$/) {
466		} elsif ($val =~ /^(no-)?(bold|underline|inverse)$/) {
467		    # effect
468
469		} elsif ($val =~ /^(reset|normal)$/) {
470		    # effect also
471		} else {
472		    #@ Field has invalid color or effect (role: C)
473		    #@   xo_emit("{C:fg-purple,bold}{:foo}{C:gween}", x);
474		    #@ Should be:
475		    #@   xo_emit("{C:fg-red,bold}{:foo}{C:fg-green}", x);
476		    #@ The list of colors and effects are limited.  The
477		    #@ set of colors includes default, black, red, green,
478		    #@ yellow, blue, magenta, cyan, and white, which must
479		    #@ be prefixed by either "fg-" or "bg-".  Effects are
480		    #@ limited to bold, no-bold, underline, no-underline,
481		    #@ inverse, no-inverse, normal, and reset.  Values must
482		    #@ be separated by commas.
483		    error("Field has invalid color or effect (role: C) ($val)");
484		}
485	    }
486	}
487    }
488
489    # Humanized field
490    if ($field[0] =~ /h/) {
491	if (length($field[2]) == 0) {
492	    #@ Field has humanize modifier but no format string
493	    #@   xo_emit("{h:value}", value);
494	    #@ Should be:
495	    #@   xo_emit("{h:value/%d}", value);
496	    #@ Humanization is only value for numbers, which are not
497	    #@ likely to use the default format ("%s").
498	    error("Field has humanize modifier but no format string");
499	}
500    }
501
502    # hn-* on non-humanize field
503    if ($field[0] !~ /h/) {
504	if ($field[4] =~ /,hn-/) {
505	    #@ Field has hn-* modifier but not 'h' modifier
506	    #@   xo_emit("{,hn-1000:value}", value);
507	    #@ Should be:
508	    #@   xo_emit("{h,hn-1000:value}", value);
509	    #@ The hn-* modifiers (hn-decimal, hn-space, hn-1000)
510	    #@ are only valid for fields with the {h:} modifier.
511	    error("Field has hn-* modifier but not 'h' modifier");
512	}
513    }
514
515    # A value field
516    if (length($field[0]) == 0 || $field[0] =~ /V/) {
517
518	#@ Value field must have a name (as content)")
519	#@     xo_emit("{:/%s}", "value");
520	#@ Should be:
521	#@     xo_emit("{:tag-name/%s}", "value");
522	#@ The field name is used for XML and JSON encodings.  These
523	#@ tags names are static and must appear directly in the
524	#@ field descriptor.
525	error("value field must have a name (as content)")
526	    unless $field[1];
527
528	#@ Use hyphens, not underscores, for value field name
529	#@     xo_emit("{:no_under_scores}", "bad");
530	#@ Should be:
531	#@     xo_emit("{:no-under-scores}", "bad");
532	#@ Use of hyphens is traditional in XML, and the XOF_UNDERSCORES
533	#@ flag can be used to generate underscores in JSON, if desired.
534	#@ But the raw field name should use hyphens.
535	error("use hyphens, not underscores, for value field name")
536	    if $field[1] =~ /_/;
537
538	#@ Value field name cannot start with digit
539	#@     xo_emit("{:10-gig/}");
540	#@ Should be:
541	#@     xo_emit("{:ten-gig/}");
542	#@ XML element names cannot start with a digit.
543	error("value field name cannot start with digit")
544	    if $field[1] =~ /^[0-9]/;
545
546	#@ Value field name should be lower case
547	#@     xo_emit("{:WHY-ARE-YOU-SHOUTING}", "NO REASON");
548	#@ Should be:
549	#@     xo_emit("{:why-are-you-shouting}", "no reason");
550	#@ Lower case is more civilized.  Even TLAs should be lower case
551	#@ to avoid scenarios where the differences between "XPath" and
552	#@ "Xpath" drive your users crazy.  Lower case rules the seas.
553	error("value field name should be lower case")
554	    if $field[1] =~ /[A-Z]/;
555
556	#@ Value field name should be longer than two characters
557	#@     xo_emit("{:x}", "mumble");
558	#@ Should be:
559	#@     xo_emit("{:something-meaningful}", "mumble");
560	#@ Field names should be descriptive, and it's hard to
561	#@ be descriptive in less than two characters.  Consider
562	#@ your users and try to make something more useful.
563	#@ Note that this error often occurs when the field type
564	#@ is placed after the colon ("{:T/%20s}"), instead of before
565	#@ it ("{T:/20s}").
566	error("value field name should be longer than two characters")
567	    if $field[1] =~ /[A-Z]/;
568
569	#@ Value field name contains invalid character
570	#@     xo_emit("{:cost-in-$$/%u}", 15);
571	#@ Should be:
572	#@     xo_emit("{:cost-in-dollars/%u}", 15);
573	#@ An invalid character is often a sign of a typo, like "{:]}"
574	#@ instead of "{]:}".  Field names are restricted to lower-case
575	#@ characters, digits, and hyphens.
576	error("value field name contains invalid character (" . $field[1] . ")")
577	    unless $field[1] =~ /^[0-9a-z-]*$/;
578    }
579
580    # A decoration field
581    if ($field[0] =~ /D/) {
582
583	#@decoration field contains invalid character
584	#@     xo_emit("{D:not good}");
585	#@ Should be:
586	#@     xo_emit("{D:((}{:good}{D:))}", "yes");
587	#@ This is minor, but fields should use proper roles.  Decoration
588	#@ fields are meant to hold punctuation and other characters used
589	#@ to decorate the content, typically to make it more readable
590	#@ to human readers.
591	warn("decoration field contains invalid character")
592	    unless $field[1] =~ m:^[~!\@\#\$%^&\*\(\);\:\[\]\{\} ]+$:;
593    }
594
595    if ($field[0] =~ /[\[\]]/) {
596	#@ Anchor content should be decimal width
597	#@     xo_emit("{[:mumble}");
598	#@ Should be:
599	#@     xo_emit("{[:32}");
600	#@ Anchors need an integer value to specify the width of
601	#@ the set of anchored fields.  The value can be positive
602	#@ (for left padding/right justification) or negative (for
603	#@ right padding/left justification) and can appear in
604	#@ either the start or stop anchor field descriptor.
605	error("anchor content should be decimal width")
606	    if $field[1] && $field[1] !~ /^-?\d+$/ ;
607
608	#@ Anchor format should be "%d"
609	#@     xo_emit("{[:/%s}");
610	#@ Should be:
611	#@     xo_emit("{[:/%d}");
612	#@ Anchors only grok integer values, and if the value is not static,
613	#@ if must be in an 'int' argument, represented by the "%d" format.
614	#@ Anything else is an error.
615	error("anchor format should be \"%d\"")
616	    if $field[2] && $field[2] ne "%d";
617
618	#@ Anchor cannot have both format and encoding format")
619	#@     xo_emit("{[:32/%d}");
620	#@ Should be:
621	#@     xo_emit("{[:32}");
622	#@ Anchors can have a static value or argument for the width,
623	#@ but cannot have both.
624	error("anchor cannot have both format and encoding format")
625	    if $field[1] && $field[2];
626    }
627}
628
629sub count_args {
630    my($format) = @_;
631
632    return -1 unless $format;
633
634    my $in;
635    my($text, $ff, $fc, $rest);
636    for ($in = $format; $in; $in = $rest) {
637	($text, $ff, $fc, $rest) =
638	   ($in =~ /^([^%]*)(%[^%diouxXDOUeEfFgGaAcCsSp]*)([diouxXDOUeEfFgGaAcCsSp])(.*)$/);
639	unless ($ff) {
640	    # Might be a "%%"
641	    ($text, $ff, $rest) = ($in =~ /^([^%]*)(%%)(.*)$/);
642	    if ($ff) {
643		check_text($text);
644	    } else {
645		# Not sure what's going on here, but something's wrong...
646		error("invalid field format") if $in =~ /%/;
647	    }
648	    next;
649	}
650
651	check_text($text);
652	check_field_format($ff, $fc);
653    }
654
655    return 0;
656}
657
658sub check_field_format {
659    my($ff, $fc) = @_;
660
661    print "check_field_format: [$ff] [$fc]\n" if $opt_debug;
662
663    my(@chunks) = split(/\./, $ff);
664
665    #@ Max width only valid for strings
666    #@     xo_emit("{:tag/%2.4.6d}", 55);
667    #@ Should be:
668    #@     xo_emit("{:tag/%2.6d}", 55);
669    #@ libxo allows a true 'max width' in addition to the traditional
670    #@ printf-style 'max number of bytes to use for input'.  But this
671    #@ is supported only for string values, since it makes no sense
672    #@ for non-strings.  This error may occur from a typo,
673    #@ like "{:tag/%6..6d}" where only one period should be used.
674    error("max width only valid for strings")
675	if $#chunks >= 2 && $fc !~ /[sS]/;
676}
677
678sub error {
679    return if $opt_vocabulary;
680    print STDERR $curfile . ": " .$curln . ": error: " . join(" ", @_) . "\n";
681    print STDERR $replay . "\n" if $opt_print;
682    $errors += 1;
683}
684
685sub warn {
686    return if $opt_vocabulary;
687    print STDERR $curfile . ": " .$curln . ": warning: " . join(" ", @_) . "\n";
688    print STDERR $replay . "\n" if $opt_print;
689    $warnings += 1;
690}
691
692sub info {
693    return if $opt_vocabulary;
694    print STDERR $curfile . ": " .$curln . ": info: " . join(" ", @_) . "\n";
695    print STDERR $replay . "\n" if $opt_print;
696    $info += 1;
697}
698
699main: {
700    main();
701}
702