3 # Unconditionally regenerate:
8 # from information stored in
11 # plus all the .c and .h files listed in MANIFEST
13 # Has an optional arg, which is the directory to chdir to before reading
14 # MANIFEST and *.[ch].
16 # This script is invoked as part of 'make all'
18 # '=head1' are the only headings looked for. If the first non-blank line after
19 # the heading begins with a word character, it is considered to be the first
20 # line of documentation that applies to the heading itself. That is, it is
21 # output immediately after the heading, before the first function, and not
22 # indented. The next input line that is a pod directive terminates this
23 # heading-level documentation.
25 # The meanings of the flags fields in embed.fnc and the source code is
26 # documented at the top of embed.fnc.
33 or die "Couldn't chdir to '$workdir': $!";
35 require './regen/regen_lib.pl';
36 require './regen/embed_lib.pl';
38 my @specialized_docs = sort qw( perlguts
51 return "F<$name>" if $name =~ /\./;
54 my $other_places_api = join " ", map { name_in_pod($_) } sort @specialized_docs, 'perlintern';
55 my $other_places_intern = join " ", map { name_in_pod($_) } sort @specialized_docs, 'perlapi';
57 @specialized_docs = map { name_in_pod($_) } sort @specialized_docs;
58 $specialized_docs[-1] =~ s/^/and /;
59 my $specialized_docs = join ", ", @specialized_docs;
62 # See database of global and static function prototypes in embed.fnc
63 # This is used to generate prototype headers under various configurations,
64 # export symbols lists for different platforms, and macros to provide an
65 # implicit interpreter context argument.
73 my $curheader = "Unknown section";
75 sub autodoc ($$) { # parse a file and extract documentation info
77 my($in, $doc, $line, $header_doc);
80 my $get_next_line = sub { $line++; return <$fh> };
83 while (defined($in = $get_next_line->())) {
84 if ($in=~ /^=head1 (.*)/) {
87 # If the next non-space line begins with a word char, then it is
88 # the start of heading-level documentation.
89 if (defined($doc = $get_next_line->())) {
90 # Skip over empty lines
91 while ($doc =~ /^\s+$/) {
92 if (! defined($doc = $get_next_line->())) {
103 # Continue getting the heading-level documentation until read
104 # in any pod directive (or as a fail-safe, find a closing
105 # comment to this pod in a C language file
107 while (defined($doc = $get_next_line->())) {
108 if ($doc =~ /^=\w/) {
113 if ($doc =~ m:^\s*\*/$:) {
114 warn "=cut missing? $file:$line:$doc";;
123 # Parentheses are used to accept anything that looks like 'for
124 # apidoc', and later verify that things are the actual correct syntax.
125 my $apidoc_re = qr/^(\s*)(=?)(\s*)for(\s*)apidoc(\s*)(.*?)\s*\n/;
127 if ($in =~ /^=for comment/) {
128 $in = $get_next_line->();
129 if ($in =~ /skip apidoc/) { # Skips the next apidoc-like line
130 while (defined($in = $get_next_line->())) {
131 last if $in =~ $apidoc_re;
137 if ($in =~ $apidoc_re) {
138 my $is_in_proper_form = length $1 == 0
144 my $proto_in_file = $6;
145 my $proto = $proto_in_file;
146 $proto = "||$proto" unless $proto =~ /\|/;
147 my($flags, $ret, $name, @args) = split /\s*\|\s*/, $proto;
148 $name && $is_in_proper_form or die <<EOS;
149 Bad apidoc at $file line $.:
152 =for apidoc flags|returntype|name|arg|arg|...
153 =for apidoc flags|returntype|name
156 die "flag $1 is not legal (for function $name (from $file))"
157 if $flags =~ / ( [^AabCDdEefhiMmNnTOoPpRrSsUuWXx] ) /x;
158 next FUNC if $flags =~ /h/;
160 die "'u' flag must also have 'm' flag' for $name" if $flags =~ /u/ && $flags !~ /m/;
161 warn ("'$name' not \\w+ in '$proto_in_file' in $file")
162 if $flags !~ /N/ && $name !~ / ^ [_[:alpha:]] \w* $ /x;
164 if (exists $seen{$name}) {
165 die ("'$name' in $file was already documented in $seen{$name}");
168 $seen{$name} = $file;
173 while (defined($doc = $get_next_line->())) {
175 # Other pod commands are considered part of the current
176 # function's docs, so can have lists, etc.
177 last DOC if $doc =~ /^=(cut|for\s+apidoc|head)/;
178 if ($doc =~ m:^\*/$:) {
179 warn "=cut missing? $file:$line:$doc";;
184 $docs = "\n$docs" if $docs and $docs !~ /^\n/;
186 # If the entry is also in embed.fnc, it should be defined
187 # completely there, but not here
188 my $embed_docref = delete $funcflags{$name};
189 if ($embed_docref and %$embed_docref) {
190 warn "embed.fnc entry overrides redundant information in"
191 . " '$proto_in_file' in $file" if $flags || $ret || @args;
192 $flags = $embed_docref->{'flags'};
193 warn "embed.fnc entry '$name' missing 'd' flag"
194 unless $flags =~ /d/;
195 next FUNC if $flags =~ /h/;
196 $ret = $embed_docref->{'retval'};
197 @args = @{$embed_docref->{args}};
198 } elsif ($flags !~ /m/) { # Not in embed.fnc, is missing if not a
200 $missing{$name} = $file;
203 my $inline_where = $flags =~ /A/ ? 'api' : 'guts';
205 if (exists $docs{$inline_where}{$curheader}{$name}) {
206 warn "$0: duplicate API entry for '$name' in $inline_where/$curheader\n";
209 $docs{$inline_where}{$curheader}{$name}
210 = [$flags, $docs, $ret, $file, @args];
212 # Create a special entry with an empty-string name for the
213 # heading-level documentation.
214 if (defined $header_doc) {
215 $docs{$inline_where}{$curheader}{""} = $header_doc;
220 if ($doc =~ /^=(?:for|head)/) {
225 warn "$file:$line:$in";
231 sub docout ($$$) { # output the docs for one function
232 my($fh, $name, $docref) = @_;
233 my($flags, $docs, $ret, $file, @args) = @$docref;
237 $docs = "\n\nDEPRECATED! It is planned to remove this function from a
238 future release of Perl. Do not use it for new code; remove it from
239 existing code.\n\n$docs";
242 $docs = "\n\nNOTE: this function is experimental and may change or be
243 removed without notice.\n\n$docs" if $flags =~ /x/;
246 # Is Perl_, but no #define foo # Perl_foo
247 my $p = $flags =~ /p/ && $flags =~ /o/ && $flags !~ /M/;
249 $docs .= "NOTE: the perl_ form of this function is deprecated.\n\n"
252 $docs .= "NOTE: this function must be explicitly called as Perl_$name";
253 $docs .= " with an aTHX_ parameter" if $flags !~ /T/;
257 print $fh "=item $name\nX<$name>\n$docs";
259 if ($flags =~ /U/) { # no usage
260 warn("U and s flags are incompatible") if $flags =~ /s/;
263 if ($flags =~ /n/) { # no args
264 warn("n flag without m") unless $flags =~ /m/;
265 warn("n flag but apparently has args") if @args;
266 print $fh "\t$ret\t$name";
267 } else { # full usage
268 my $n = "Perl_"x$p . $name;
269 my $large_ret = length $ret > 7;
270 my $indent_size = 7+8 # nroff: 7 under =head + 8 under =item
271 +8+($large_ret ? 1 + length $ret : 8)
274 print $fh "\t$ret" . ($large_ret ? ' ' : "\t") . "$n(";
277 if ($indent_size + 2 + length > 79) {
279 $indent_size -= length($n) - 3;
284 if ($flags !~ /T/ && ($p || ($flags =~ /m/ && $name =~ /^Perl_/))) {
285 $args = @args ? "pTHX_ " : "pTHX";
286 if ($long_args) { print $fh $args; $args = '' }
288 $long_args and print $fh "\n";
289 my $first = !$long_args;
293 && $indent_size + 3 + length($args[0]) + length $args > 79
298 "\t".($large_ret ? " " x (1+length $ret) : "\t")
299 ." "x($long_args ? 4 : 1 + length $n)
301 $args, (","x($args ne 'pTHX_ ') . "\n")x!!@args;
305 $args .= ", "x!!(length $args && $args ne 'pTHX_ ')
308 if ($long_args) { print $fh "\n", substr $indent, 0, -4 }
311 print $fh ";" if $flags =~ /s/; # semicolon "dTHR;"
314 print $fh "=for hackers\nFound in file $file\n\n";
318 # Do a case-insensitive dictionary sort, with only alphabetics
319 # significant, falling back to using everything for determinancy
320 return (uc($a =~ s/[[:^alpha:]]//r) cmp uc($b =~ s/[[:^alpha:]]//r))
326 my ($podname, $header, $dochash, $missing, $footer) = @_;
328 # strip leading '|' from each line which had been used to hide
329 # pod from pod checkers.
330 s/^\|//gm for $header, $footer;
332 my $fh = open_new("pod/$podname.pod", undef,
333 {by => "$0 extracting documentation",
334 from => 'the C source files'}, 1);
339 for $key (sort sort_helper keys %$dochash) {
340 my $section = $dochash->{$key};
341 print $fh "\n=head1 $key\n\n";
343 # Output any heading-level documentation and delete so won't get in
345 if (exists $section->{""}) {
346 print $fh $section->{""} . "\n";
347 delete $section->{""};
349 print $fh "=over 8\n\n";
351 for my $key (sort sort_helper keys %$section) {
352 docout($fh, $key, $section->{$key});
354 print $fh "\n=back\n";
358 print $fh "\n=head1 Undocumented functions\n\n";
359 print $fh $podname eq 'perlapi' ? <<'_EOB_' : <<'_EOB_';
360 The following functions have been flagged as part of the public API,
361 but are currently undocumented. Use them at your own risk, as the
362 interfaces are subject to change. Functions that are not listed in this
363 document are not intended for public use, and should NOT be used under any
366 If you feel you need to use one of these functions, first send email to
367 L<perl5-porters@perl.org|mailto:perl5-porters@perl.org>. It may be
368 that there is a good reason for the function not being documented, and it
369 should be removed from this list; or it may just be that no one has gotten
370 around to documenting it. In the latter case, you will be asked to submit a
371 patch to document the function. Once your patch is accepted, it will indicate
372 that the interface is stable (unless it is explicitly marked otherwise) and
375 The following functions are currently undocumented. If you use one of
376 them, you may wish to consider creating and submitting documentation for
379 print $fh "\n=over\n\n";
381 for my $missing (sort @$missing) {
382 print $fh "=item $missing\nX<$missing>\n\n";
384 print $fh "=back\n\n";
386 print $fh $footer, "=cut\n";
388 read_only_bottom_close_and_rename($fh);
391 foreach (@{(setup_embed())[0]}) {
393 my ($flags, $retval, $func, @args) = @$_;
394 s/\b(?:NN|NULLOK)\b\s+//g for @args;
396 $funcflags{$func} = {
403 # glob() picks up docs from extra .c or .h files that may be in unclean
405 open my $fh, '<', 'MANIFEST'
406 or die "Can't open MANIFEST: $!";
407 while (my $line = <$fh>) {
408 next unless my ($file) = $line =~ /^(\S+\.(?:[ch]|pod))\t/;
410 open F, '<', $file or die "Cannot open $file for docs: $!\n";
411 $curheader = "Functions in file $file\n";
413 close F or die "Error closing $file: $!\n";
415 close $fh or die "Error whilst reading MANIFEST: $!";
417 for (sort keys %funcflags) {
418 next unless $funcflags{$_}{flags} =~ /d/;
419 next if $funcflags{$_}{flags} =~ /h/;
420 warn "no docs for $_\n"
423 foreach (sort keys %missing) {
424 warn "Function '$_', documented in $missing{$_}, not listed in embed.fnc";
427 # walk table providing an array of components in each line to
428 # subroutine, printing the result
430 # List of funcs in the public API that aren't also marked as core-only,
431 # experimental nor deprecated.
432 my @missing_api = grep $funcflags{$_}{flags} =~ /A/
433 && $funcflags{$_}{flags} !~ /[xD]/
434 && !$docs{api}{$_}, keys %funcflags;
435 output('perlapi', <<"_EOB_", $docs{api}, \@missing_api, <<"_EOE_");
440 |perlapi - autogenerated documentation for the perl public API
443 |X<Perl API> X<API> X<api>
445 |This file contains most of the documentation of the perl public API, as
446 |generated by F<embed.pl>. Specifically, it is a listing of functions,
447 |macros, flags, and variables that may be used by extension writers. Some
448 |specialized items are instead documented in $specialized_docs.
450 |L<At the end|/Undocumented functions> is a list of functions which have yet
451 |to be documented. Patches welcome! The interfaces of these are subject to
452 |change without notice.
454 |Anything not listed here is not part of the public API, and should not be
455 |used by extension writers at all. For these reasons, blindly using functions
456 |listed in proto.h is to be avoided when writing extensions.
458 |In Perl, unlike C, a string of characters may generally contain embedded
459 |C<NUL> characters. Sometimes in the documentation a Perl string is referred
460 |to as a "buffer" to distinguish it from a C string, but sometimes they are
461 |both just referred to as strings.
463 |Note that all Perl API global variables must be referenced with the C<PL_>
464 |prefix. Again, those not listed here are not to be used by extension writers,
465 |and can be changed or removed without notice; same with macros.
466 |Some macros are provided for compatibility with the older,
467 |unadorned names, but this support may be disabled in a future release.
469 |Perl was originally written to handle US-ASCII only (that is characters
470 |whose ordinal numbers are in the range 0 - 127).
471 |And documentation and comments may still use the term ASCII, when
472 |sometimes in fact the entire range from 0 - 255 is meant.
474 |The non-ASCII characters below 256 can have various meanings, depending on
475 |various things. (See, most notably, L<perllocale>.) But usually the whole
476 |range can be referred to as ISO-8859-1. Often, the term "Latin-1" (or
477 |"Latin1") is used as an equivalent for ISO-8859-1. But some people treat
478 |"Latin1" as referring just to the characters in the range 128 through 255, or
479 |somethimes from 160 through 255.
480 |This documentation uses "Latin1" and "Latin-1" to refer to all 256 characters.
482 |Note that Perl can be compiled and run under either ASCII or EBCDIC (See
483 |L<perlebcdic>). Most of the documentation (and even comments in the code)
484 |ignore the EBCDIC possibility.
485 |For almost all purposes the differences are transparent.
486 |As an example, under EBCDIC,
487 |instead of UTF-8, UTF-EBCDIC is used to encode Unicode strings, and so
488 |whenever this documentation refers to C<utf8>
489 |(and variants of that name, including in function names),
490 |it also (essentially transparently) means C<UTF-EBCDIC>.
491 |But the ordinals of characters differ between ASCII, EBCDIC, and
492 |the UTF- encodings, and a string encoded in UTF-EBCDIC may occupy a different
493 |number of bytes than in UTF-8.
495 |The listing below is alphabetical, case insensitive.
501 |Until May 1997, this document was maintained by Jeff Okamoto
502 |<okamoto\@corp.hp.com>. It is now maintained as part of Perl itself.
504 |With lots of help and suggestions from Dean Roehrich, Malcolm Beattie,
505 |Andreas Koenig, Paul Hudson, Ilya Zakharevich, Paul Marquess, Neil
506 |Bowers, Matthew Green, Tim Bunce, Spider Boardman, Ulrich Pfeifer,
507 |Stephen McCamant, and Gurusamy Sarathy.
509 |API Listing originally by Dean Roehrich <roehrich\@cray.com>.
511 |Updated to be autogenerated from comments in the source by Benjamin Stuhl.
518 # List of non-static internal functions
520 grep $funcflags{$_}{flags} !~ /[AS]/ && !$docs{guts}{$_}, keys %funcflags;
522 output('perlintern', <<'_EOB_', $docs{guts}, \@missing_guts, <<"_EOE_");
525 |perlintern - autogenerated documentation of purely B<internal>
529 |X<internal Perl functions> X<interpreter functions>
531 |This file is the autogenerated documentation of functions in the
532 |Perl interpreter that are documented using Perl's internal documentation
533 |format but are not marked as part of the Perl API. In other words,
534 |B<they are not for use in extensions>!
540 |The autodocumentation system was originally added to the Perl core by
541 |Benjamin Stuhl. Documentation is by whoever was kind enough to
542 |document their functions.