aboutsummaryrefslogtreecommitdiffstats
path: root/manual/summary.pl
blob: 62897e9a79d5ad5d57c4225265554550d89f2c49 (plain)
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
#!/usr/bin/perl
# Generate the Summary of Library Facilities (summary.texi).

# Copyright (C) 2017-2018 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# Contributed by Rical Jasan <ricaljasan@pacific.net>, 2017.

# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation; either version 2.1 of
# the License, or (at your option) any later version.

# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.

# Anything declared in a header or defined in a standard should have
# its origins annotated using the @standards macro (see macro.texi).
# This script checks all such elements in the manual (generally,
# @def|item*-commands), ensuring annotations are present and correct.
# If any errors are detected, they are all reported at the end and
# failure is indicated.

use strict;
use warnings;
use locale;
use File::Basename;

$| = 1;
my $script = basename $0;

&help if $ARGV[0] eq "--help"; # Will exit(0).

my @texis = @ARGV;

# Various regexes.
my $nde = qr/^\@node /;
my $def = qr/^\@def/;
my $itm = qr/^\@item /;
my $itms = qr/^\@itemx? /; # Don't match @itemize.
my $ann = qr/^\@(def\w+|item)x? /; # Annotatable.
my $std = qr/^\@standards\{/;
my $stx = qr/^\@standardsx\{/;
my $stds = qr/^\@standardsx?\{/;
my $strict_std = qr/^\@standards\{([^,]+, )[^,\}]+\}$/;
my $strict_stx = qr/^\@standardsx\{([^,]+, ){2}[^,\}]+\}$/;
my $lcon = qr/([vf]?table|itemize|enumerate)/;
my $list = qr/^\@${lcon}/;
my $endl = qr/^\@end ${lcon}/;
my $ign = qr/^\@ignore/;
my $eig = qr/^\@end ignore/;

# Global scope.
my $node;
our $texi;
my $input;
my %entries;
my %errors;

for $texi (@texis) {
    open $input, '<', $texi or die "open $texi: $!";
    while (my $line = <$input>) {
	if ($line =~ $nde) {
	    $node = &get_node($line);
	} elsif ($line =~ $def) {
	    &process_annotation($line);
	} elsif ($line =~ $list) {
	    &process_list($1); # @items occur in list or table context.
	} elsif ($line =~ $stds) {
	    &record_error("Misplaced annotation", ["[$.] ".$line]);
	} elsif ($line =~ $ign) {
	    while (<$input> !~ $eig) {}
	}
    }
    close $input or die "close $texi: $!";
}

# Disabled until annotations are complete.
&print_errors() if %errors && 0; # Will exit(1).

print("\@c DO NOT EDIT THIS FILE!\n".
      "\@c This file is generated by $script from the Texinfo sources.\n".
      "\@c The \@items are \@include'd from a \@table in header.texi.\n\n");

&print_entry($_) for sort keys %entries;

# Processes an annotatable element, including any subsequent elements
# in an @*x chain, ensuring @standards are present, with valid syntax,
# either recording any errors detected or creating Summary entries.
# This function is the heart of the script.
#
# Prototypes and standards are gathered into separate lists and used
# to evaluate the completeness and correctness of annotations before
# generating the Summary entries.  "Prototype" is used to refer to an
# element's entire definition while avoiding conflation with
# @def*-commands.  "Element" is strictly used here to refer to the
# name extracted from the prototype, as used in @standardsx, for
# sorting the Summary.
sub process_annotation
{
    my $line = shift;
    my (@prototypes, @standards, $i, @tmp);

    # Gather prototypes and standards.
    push @prototypes, $line;
    while ($line = <$input>) {
	last if $line !~ $ann;
	push @prototypes, $line;
    }
    if ($line !~ $stds) { # The fundamental error.
	return &record_error('Missing annotation', \@prototypes);
    }
    push @standards, $line;
    push @standards, $line while ($line = <$input>) =~ $stds;

    # If next line is an @item, seek back to catch it on the next
    # iteration.  This avoids imposing a non-Texinfo syntax
    # requirement of blank lines between consecutive annotated @items.
    if ($line =~ $itm) {
	seek $input, -length($line), 1 or die "seek: $!";
    }

    # Strict check for syntax errors.  Other matches are loose, which
    # aids error detection and reporting by ensuring things that look
    # like standards aren't simply passed over, but caught here.
    for ($i=0; $i<@standards; ++$i) {
	my $standard = $standards[$i];
	if ($standard !~ $strict_std && $standard !~ $strict_stx) {
	    push @tmp, $standard;
	}
    }
    return &record_error('Invalid syntax', \@tmp) if @tmp;

    # @standardsx should not be in non-@*x chains.
    if (@prototypes == 1) {
	for ($i=0; $i<@standards; ++$i) {
	    return &record_error('Misplaced @standardsx', \@prototypes)
		if $standards[$i] =~ $stx;
	}
    }
    # @standards may only occur once in @*x chains, at the beginning.
    if (@prototypes > 1) {
	for ($i=1; $i<@standards; ++$i) {
	    return &record_error('Misplaced @standards', \@prototypes)
		if $standards[$i] =~ $std;
	}
    }

    # The @standards are aligned.
    &add_entries(\@prototypes, \@standards);
}

# Goes through the prototypes, cleaning them up and extracting the
# elements, pairing them with the appropriate annotations to create
# Summary entries.
sub add_entries
{
    my ($prototypes, $standards) = @_;
    my $isx = @{$prototypes} > 1 ? 1 : 0;
    my $allx = $standards->[0] =~ $stx ? 1 : 0;
    my ($defstd, $defhdr, %standardsx, $i, $j);

    # Grab the default annotation and index any @standardsx.  Take
    # care in case there is no default.
    if ($isx) {
	if (!$allx) {
	    ($defstd, $defhdr)
		= $standards->[0] =~ /${std}([^,]+), (.*)\}$/;
	}
	for ($i = $allx ? 0 : 1; $i<@{$standards}; ++$i) {
	    my ($e, $s, $h)
		= $standards->[$i] =~ /${stx}([^,]+), ([^,]+), (.*)\}$/;
	    push @{$standardsx{$e}{hs}}, [$h, $s];
	}
    }

    for ($i=0; $i<@{$prototypes}; ++$i) {
	my $e = &get_element($prototypes->[$i]);
	my $p = &get_prototype($prototypes->[$i]);
	my ($s, $h);
	if ($isx && exists $standardsx{$e}) {
	    for ($j=0; $j<@{$standardsx{$e}{hs}}; ++$j) {
		$h = $standardsx{$e}{hs}[$j]->[0];
		$s = $standardsx{$e}{hs}[$j]->[1];
		&record_entry($e, $p, $h, $s, $node);
		++$standardsx{$e}{seen};
	    }
	} elsif ($isx && $allx) {
	    &record_error('Missing annotation', [$prototypes->[$i]]);
	} elsif ($isx) {
	    &record_entry($e, $p, $defhdr, $defstd, $node);
	} else {
	    for ($j=0; $j<@{$standards}; ++$j) {
		($s, $h) = $standards->[$j] =~ /${std}([^,]+), ([^,\}]+)\}$/;
		&record_entry($e, $p, $h, $s, $node);
	    }
	}
    }

    # Check if there were any unmatched @standardsx.
    for my $e (keys %standardsx) {
	if (!exists $standardsx{$e}{seen}) {
	    &record_error('Spurious @standardsx', [$e."\n"])
	}
    }
}

# Stores a Summary entry in %entries.  May be called multiple times
# per element if multiple header and standard annotations exist.  Also
# keys on prototypes, as some elements have multiple prototypes.  See
# isnan in arith.texi for one example.
sub record_entry
{
    my ($ele, $proto, $hdr, $std, $node) = @_;
    push @{$entries{$ele}{$proto}}, [$hdr, $std, $node];
}

# Processes list or table contexts, with nesting.
sub process_list
{
    my $type = shift;
    my $in_vtbl = $type eq "vtable" ? 1 : 0;

    while (my $line = <$input>) {
	if ($line =~ $itms) {
	    next if ! $in_vtbl; # Not an annotatable context.
	    &process_annotation($line);
	} elsif ($line =~ $def) {
	    &process_annotation($line);
	} elsif ($line =~ $stds) {
	    &record_error('Misplaced annotation', ["[$.] ".$line]);
	} elsif ($line =~ $endl) {
	    return; # All done.
	} elsif ($line =~ $list) {
	    &process_list($1); # Nested list.
	}
    }
}

# Returns the current node from an @node line.  Used for referencing
# from the Summary.
sub get_node
{
    my $line = shift;
    chomp $line;
    $line =~ s/$nde//;
    my ($n) = split ',', $line;
    return $n
}

# Returns the cleaned up prototype from @def|item* lines.
sub get_prototype
{
    my $dfn = shift;
    chomp $dfn;
    $dfn =~ s/\s+/ /g; # Collapse whitespace.
    $dfn =~ s/ \{([^\}]*)\} / $1 /g; # Remove grouping braces.
    $dfn =~ s/^\@\S+ //; # Remove @-command.
    $dfn =~ s/^Macro //i; # Scrape off cruft...
    $dfn =~ s/^Data Type //i;
    $dfn =~ s/^Variable //i;
    $dfn =~ s/^Deprecated Function //i;
    $dfn =~ s/^SVID Macro //i;
    $dfn =~ s/^Obsolete function //i;
    $dfn =~ s/^Constant //i;
    $dfn =~ s/^Type //i;
    $dfn =~ s/^Function //i;
    $dfn =~ s/^\{(.*)\}$/$1/; # Debrace yourself.
    $dfn =~ s/^\{([^\}]*)\} /$1 /; # These ones too.
    return $dfn;
}

# Returns an annotated element's name.
#
# Takes a line defining an annotatable element (e.g., @def|item*),
# splitting it on whitespace.  The element is generally detected as
# the member immediately preceding the first parenthesized expression
# (e.g., a function), or the last token in the list.  Some additional
# cleanup is applied to the element before returning it.
sub get_element
{
    my $i = 0;
    my @toks = split /\s+/, shift;
    # tzname array uses '['; don't match function pointers.
    ++$i while $toks[$i] && $toks[$i] !~ /^[\(\[](?!\*)/;
    $toks[$i-1] =~ s/^\*//; # Strip pointer type syntax.
    $toks[$i-1] =~ s/^\{?([^\}]+)\}?$/$1/; # Strip braces.
    $toks[$i-1] =~ s/^\(\*([^\)]+)\)$/$1/; # Function pointers.
    return $toks[$i-1];
}

# Records syntax errors detected in the manual related to @standards.
# The @def|item*s are grouped by file, then errors, to make it easier
# to track down exactly where and what the problems are.
sub record_error
{
    my ($err, $list) = @_;
    push @{$errors{$texi}{$err}}, $_ for (@{$list});
    return 0;
}

# Reports all detected errors and exits with failure.  Indentation is
# used for readability, and "ERROR" is used for visibility.
sub print_errors
{
    for $texi (sort keys %errors) {
	print STDERR "ERRORS in $texi:\n";
	for my $err (sort keys %{$errors{$texi}}) {
	    print STDERR "  $err:\n";
	    print STDERR "    $_" for (@{$errors{$texi}{$err}});
	}
    }
    print(STDERR "\nFor a description of expected syntax, see ".
	  "\`$script --help'\n\n");
    exit 1;
}

# Prints an entry in the Summary.
#
# All the blank lines in summary.texi may seem strange at first, but
# they have significant impact on how Texinfo renders the output.
# Essentially, each line is its own paragraph.  There is a @comment
# with the element name, arguably unnecessary, but useful for seeing
# the sorting order and extracted element names, and maintains the
# format established by summary.awk.  Each @item in the @table is the
# prototype, which may be anything from just a variable name to a
# function declaration.  The body of each @item contains lines
# annotating the headers and standards each element is declared
# in/comes from, with a reference to the @node documenting the element
# wrt. each header and standard combination.
sub print_entry
{
    my $element = shift;
    for my $prototype (sort keys %{$entries{$element}}) {
	print "\@comment $element\n\@item $prototype\n\n";
	for (@{$entries{$element}{$prototype}}) {
	    my ($header, $standard, $node)
		= ($_->[0], $_->[1], $_->[2]);
	    if ($header =~ /^\(none\)$/i) {
		$header = "\@emph{no header}";
	    } elsif ($header =~ /\(optional\)$/) {
		$header =~ s/^(\S+) \((.*)\)$/\@file{$1} \@emph{$2}/;
	    } elsif ($header ne '???') {
		$header = "\@file{$header}";
	    }
	    print "$header ($standard):  \@ref{$node}.\n\n";
	}
    }
}

# Document the syntax of @standards.
sub help
{
    print "$script ";
    print <<'EOH';
generates the Summary of Library Facilities (summary.texi)
from @standards and @standardsx macros in the Texinfo sources (see
macros.texi).  While generating the Summary, it also checks that
@standards are used, correctly.

In general, any @def*-command or @item in a @vtable is considered
annotatable.  "Misplaced annotation" refers to @standards macros
detected outside an annotatable context.  "Missing annotation" refers
to annotatable elements without @standards.  @standards are expected
to immediately follow the elements being annotated.  In @*x lists,
@standards sets the default annotation and may only occur as the first
annotation ("Misplaced @standards").  @standardsx may not be used
outside @*x lists ("Misplaced @standardsx").  "Spurious @standardsx"
refers to otherwise valid @standardsx macros that were not matched to
an element in an @*x list.  "Invalid syntax" means just that.

The syntax of @standards annotations is designed to accomodate
multiple header and standards annotations, as necessary.

Examples:

  @deftp FOO
  @standards{STD, HDR}

  @defvar BAR
  @standards{STD, HDR1}
  @standards{STD, HDR2}

  @deftypefun foo
  @deftypefunx fool
  @standards{STD, HDR}

  @item bar
  @itemx baz
  @standardsx{bar, STD1, HDR1}
  @standardsx{baz, STD1, HDR1}
  @standardsx{baz, STD2, HDR2}

Note that @standardsx deviates from the usual Texinfo syntax in that
it is optional and may be used without @standards.
EOH
    ; exit 0;
}