texi2pod.pl

   1 #! /usr/bin/perl -w
   2
   3 #   Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
   4
   5 # This file is part of GCC.
   6
   7 # GCC is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2, or (at your option)
  10 # any later version.
  11
  12 # GCC is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with GCC; see the file COPYING.  If not,
  19 # see <http://www.gnu.org/licenses/>.
  20
  21 # This does trivial (and I mean _trivial_) conversion of Texinfo
  22 # markup to Perl POD format.  It's intended to be used to extract
  23 # something suitable for a manpage from a Texinfo document.
  24
  25 $output = 0;
  26 $skipping = 0;
  27 %sects = ();
  28 $section = "";
  29 @icstack = ();
  30 @endwstack = ();
  31 @skstack = ();
  32 @instack = ();
  33 $shift = "";
  34 %defs = ();
  35 $fnno = 1;
  36 $inf = "";
  37 $ibase = "";
  38 @ipath = ();
  39
  40 while ($_ = shift) {
  41     if (/^-D(.*)$/) {
  42         if ($1 ne "") {
  43             $flag = $1;
  44         } else {
  45             $flag = shift;
  46         }
  47         $value = "";
  48         ($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/);
  49         die "no flag specified for -D\n"
  50             unless $flag ne "";
  51         die "flags may only contain letters, digits, hyphens, dashes and underscores\n"
  52             unless $flag =~ /^[a-zA-Z0-9_-]+$/;
  53         $defs{$flag} = $value;
  54     } elsif (/^-I(.*)$/) {
  55         if ($1 ne "") {
  56             $flag = $1;
  57         } else {
  58             $flag = shift;
  59         }
  60         push (@ipath, $flag);
  61     } elsif (/^-/) {
  62         usage();
  63     } else {
  64         $in = $_, next unless defined $in;
  65         $out = $_, next unless defined $out;
  66         usage();
  67     }
  68 }
  69
  70 if (defined $in) {
  71     $inf = gensym();
  72     open($inf, "<$in") or die "opening \"$in\": $!\n";
  73     $ibase = $1 if $in =~ m|^(.+)/[^/]+$|;
  74 } else {
  75     $inf = \*STDIN;
  76 }
  77
  78 if (defined $out) {
  79     open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
  80 }
  81
  82 while(defined $inf) {
  83 while(<$inf>) {
  84     # Certain commands are discarded without further processing.
  85     /^\@(?:
  86          [a-z]+index            # @*index: useful only in complete manual
  87          |need                  # @need: useful only in printed manual
  88          |(?:end\s+)?group      # @group .. @end group: ditto
  89          |page                  # @page: ditto
  90          |node                  # @node: useful only in .info file
  91          |(?:end\s+)?ifnottex   # @ifnottex .. @end ifnottex: use contents
  92         )\b/x and next;
  93
  94     chomp;
  95
  96     # Look for filename and title markers.
  97     /^\@setfilename\s+([^.]+)/ and $fn = $1, next;
  98     /^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next;
  99
 100     # Identify a man title but keep only the one we are interested in.
 101     /^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do {
 102         if (exists $defs{$1}) {
 103             $fn = $1;
 104             $tl = postprocess($2);
 105         }
 106         next;
 107     };
 108
 109     # Look for blocks surrounded by @c man begin SECTION ... @c man end.
 110     # This really oughta be @ifman ... @end ifman and the like, but such
 111     # would require rev'ing all other Texinfo translators.
 112     /^\@c\s+man\s+begin\s+([A-Z]+)\s+([A-Za-z0-9-]+)/ and do {
 113         $output = 1 if exists $defs{$2};
 114         $sect = $1;
 115         next;
 116     };
 117     /^\@c\s+man\s+begin\s+([A-Z]+)/ and $sect = $1, $output = 1, next;
 118     /^\@c\s+man\s+end/ and do {
 119         $sects{$sect} = "" unless exists $sects{$sect};
 120         $sects{$sect} .= postprocess($section);
 121         $section = "";
 122         $output = 0;
 123         next;
 124     };
 125
 126     # handle variables
 127     /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and do {
 128         $defs{$1} = $2;
 129         next;
 130     };
 131     /^\@clear\s+([a-zA-Z0-9_-]+)/ and do {
 132         delete $defs{$1};
 133         next;
 134     };
 135
 136     next unless $output;
 137
 138     # Discard comments.  (Can't do it above, because then we'd never see
 139     # @c man lines.)
 140     /^\@c\b/ and next;
 141
 142     # End-block handler goes up here because it needs to operate even
 143     # if we are skipping.
 144     /^\@end\s+([a-z]+)/ and do {
 145         # Ignore @end foo, where foo is not an operation which may
 146         # cause us to skip, if we are presently skipping.
 147         my $ended = $1;
 148         next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex|copying)$/;
 149
 150         die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
 151         die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
 152
 153         $endw = pop @endwstack;
 154
 155         if ($ended =~ /^(?:ifset|ifclear|ignore|menu|iftex)$/) {
 156             $skipping = pop @skstack;
 157             next;
 158         } elsif ($ended =~ /^(?:example|smallexample|display)$/) {
 159             $shift = "";
 160             $_ = "";    # need a paragraph break
 161         } elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) {
 162             $_ = "\n=back\n";
 163             $ic = pop @icstack;
 164         } elsif ($ended eq "multitable") {
 165             $_ = "\n=back\n";
 166         } else {
 167             die "unknown command \@end $ended at line $.\n";
 168         }
 169     };
 170
 171     # We must handle commands which can cause skipping even while we
 172     # are skipping, otherwise we will not process nested conditionals
 173     # correctly.
 174     /^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
 175         push @endwstack, $endw;
 176         push @skstack, $skipping;
 177         $endw = "ifset";
 178         $skipping = 1 unless exists $defs{$1};
 179         next;
 180     };
 181
 182     /^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
 183         push @endwstack, $endw;
 184         push @skstack, $skipping;
 185         $endw = "ifclear";
 186         $skipping = 1 if exists $defs{$1};
 187         next;
 188     };
 189
 190     /^\@(ignore|menu|iftex|copying)\b/ and do {
 191         push @endwstack, $endw;
 192         push @skstack, $skipping;
 193         $endw = $1;
 194         $skipping = 1;
 195         next;
 196     };
 197
 198     next if $skipping;
 199
 200     # Character entities.  First the ones that can be replaced by raw text
 201     # or discarded outright:
 202     s/\@copyright\{\}/(c)/g;
 203     s/\@dots\{\}/.../g;
 204     s/\@enddots\{\}/..../g;
 205     s/\@([.!? ])/$1/g;
 206     s/\@[:-]//g;
 207     s/\@bullet(?:\{\})?/*/g;
 208     s/\@TeX\{\}/TeX/g;
 209     s/\@pounds\{\}/\#/g;
 210     s/\@minus(?:\{\})?/-/g;
 211     s/\\,/,/g;
 212
 213     # Now the ones that have to be replaced by special escapes
 214     # (which will be turned back into text by unmunge())
 215     s/&/&amp;/g;
 216     s/\@\{/&lbrace;/g;
 217     s/\@\}/&rbrace;/g;
 218     s/\@\@/&at;/g;
 219
 220     # Inside a verbatim block, handle @var specially.
 221     if ($shift ne "") {
 222         s/\@var\{([^\}]*)\}/<$1>/g;
 223     }
 224
 225     # POD doesn't interpret E<> inside a verbatim block.
 226     if ($shift eq "") {
 227         s/</&lt;/g;
 228         s/>/&gt;/g;
 229     } else {
 230         s/</&LT;/g;
 231         s/>/&GT;/g;
 232     }
 233
 234     # Single line command handlers.
 235
 236     /^\@include\s+(.+)$/ and do {
 237         push @instack, $inf;
 238         $inf = gensym();
 239         $file = postprocess($1);
 240
 241         # Try cwd and $ibase, then explicit -I paths.
 242         $done = 0;
 243         foreach $path ("", $ibase, @ipath) {
 244             $mypath = $file;
 245             $mypath = $path . "/" . $mypath if ($path ne "");
 246             open($inf, "<" . $mypath) and ($done = 1, last);
 247         }
 248         die "cannot find $file" if !$done;
 249         next;
 250     };
 251
 252     /^\@(?:section|unnumbered|unnumberedsec|center)\s+(.+)$/
 253         and $_ = "\n=head2 $1\n";
 254     /^\@subsection\s+(.+)$/
 255         and $_ = "\n=head3 $1\n";
 256     /^\@subsubsection\s+(.+)$/
 257         and $_ = "\n=head4 $1\n";
 258
 259     # Block command handlers:
 260     /^\@itemize(?:\s+(\@[a-z]+|\*|-))?/ and do {
 261         push @endwstack, $endw;
 262         push @icstack, $ic;
 263         if (defined $1) {
 264             $ic = $1;
 265         } else {
 266             $ic = '*';
 267         }
 268         $_ = "\n=over 4\n";
 269         $endw = "itemize";
 270     };
 271
 272     /^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do {
 273         push @endwstack, $endw;
 274         push @icstack, $ic;
 275         if (defined $1) {
 276             $ic = $1 . ".";
 277         } else {
 278             $ic = "1.";
 279         }
 280         $_ = "\n=over 4\n";
 281         $endw = "enumerate";
 282     };
 283
 284     /^\@multitable\s.*/ and do {
 285         push @endwstack, $endw;
 286         $endw = "multitable";
 287         $_ = "\n=over 4\n";
 288     };
 289
 290     /^\@([fv]?table)\s+(\@[a-z]+)/ and do {
 291         push @endwstack, $endw;
 292         push @icstack, $ic;
 293         $endw = $1;
 294         $ic = $2;
 295         $ic =~ s/\@(?:samp|strong|key|gcctabopt|option|env)/B/;
 296         $ic =~ s/\@(?:code|kbd)/C/;
 297         $ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
 298         $ic =~ s/\@(?:file)/F/;
 299         $_ = "\n=over 4\n";
 300     };
 301
 302     /^\@((?:small)?example|display)/ and do {
 303         push @endwstack, $endw;
 304         $endw = $1;
 305         $shift = "\t";
 306         $_ = "";        # need a paragraph break
 307     };
 308
 309     /^\@item\s+(.*\S)\s*$/ and $endw eq "multitable" and do {
 310         @columns = ();
 311         for $column (split (/\s*\@tab\s*/, $1)) {
 312             # @strong{...} is used a @headitem work-alike
 313             $column =~ s/^\@strong{(.*)}$/$1/;
 314             push @columns, $column;
 315         }
 316         $_ = "\n=item ".join (" : ", @columns)."\n";
 317     };
 318
 319     /^\@itemx?\s*(.+)?$/ and do {
 320         if (defined $1) {
 321             # Entity escapes prevent munging by the <> processing below.
 322             $_ = "\n=item $ic\&LT;$1\&GT;\n";
 323         } else {
 324             $_ = "\n=item $ic\n";
 325             $ic =~ y/A-Ya-y/B-Zb-z/;
 326             $ic =~ s/(\d+)/$1 + 1/eg;
 327         }
 328     };
 329
 330     $section .= $shift.$_."\n";
 331 }
 332 # End of current file.
 333 close($inf);
 334 $inf = pop @instack;
 335 }
 336
 337 die "No filename or title\n" unless defined $fn && defined $tl;
 338
 339 $sects{NAME} = "$fn \- $tl\n";
 340 $sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
 341
 342 for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
 343               BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
 344     if(exists $sects{$sect}) {
 345         $head = $sect;
 346         $head =~ s/SEEALSO/SEE ALSO/;
 347         print "=head1 $head\n\n";
 348         print scalar unmunge ($sects{$sect});
 349         print "\n";
 350     }
 351 }
 352
 353 sub usage
 354 {
 355     die "usage: $0 [-D toggle...] [infile [outfile]]\n";
 356 }
 357
 358 sub postprocess
 359 {
 360     local $_ = $_[0];
 361
 362     # @value{foo} is replaced by whatever 'foo' is defined as.
 363     while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) {
 364         if (! exists $defs{$2}) {
 365             print STDERR "Option $2 not defined\n";
 366             s/\Q$1\E//;
 367         } else {
 368             $value = $defs{$2};
 369             s/\Q$1\E/$value/;
 370         }
 371     }
 372
 373     # Formatting commands.
 374     # Temporary escape for @r.
 375     s/\@r\{([^\}]*)\}/R<$1>/g;
 376     s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g;
 377     s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g;
 378     s/\@(?:gccoptlist|samp|strong|key|option|env|command|b)\{([^\}]*)\}/B<$1>/g;
 379     s/\@sc\{([^\}]*)\}/\U$1/g;
 380     s/\@file\{([^\}]*)\}/F<$1>/g;
 381     s/\@w\{([^\}]*)\}/S<$1>/g;
 382     s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;
 383
 384     # keep references of the form @ref{...}, print them bold
 385     s/\@(?:ref)\{([^\}]*)\}/B<$1>/g;
 386
 387     # Change double single quotes to double quotes.
 388     s/''/"/g;
 389     s/``/"/g;
 390
 391     # Cross references are thrown away, as are @noindent and @refill.
 392     # (@noindent is impossible in .pod, and @refill is unnecessary.)
 393     # @* is also impossible in .pod; we discard it and any newline that
 394     # follows it.  Similarly, our macro @gol must be discarded.
 395
 396     s/\(?\@xref\{(?:[^\}]*)\}(?:[^.<]|(?:<[^<>]*>))*\.\)?//g;
 397     s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
 398     s/;\s+\@pxref\{(?:[^\}]*)\}//g;
 399     s/\@noindent\s*//g;
 400     s/\@refill//g;
 401     s/\@gol//g;
 402     s/\@\*\s*\n?//g;
 403
 404     # Anchors are thrown away
 405     s/\@anchor\{(?:[^\}]*)\}//g;
 406
 407     # @uref can take one, two, or three arguments, with different
 408     # semantics each time.  @url and @email are just like @uref with
 409     # one argument, for our purposes.
 410     s/\@(?:uref|url|email)\{([^\},]*)\}/&lt;B<$1>&gt;/g;
 411     s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g;
 412     s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g;
 413
 414     # Un-escape <> at this point.
 415     s/&LT;/</g;
 416     s/&GT;/>/g;
 417
 418     # Now un-nest all B<>, I<>, R<>.  Theoretically we could have
 419     # indefinitely deep nesting; in practice, one level suffices.
 420     1 while s/([BIR])<([^<>]*)([BIR])<([^<>]*)>/$1<$2>$3<$4>$1</g;
 421
 422     # Replace R<...> with bare ...; eliminate empty markup, B<>;
 423     # shift white space at the ends of [BI]<...> expressions outside
 424     # the expression.
 425     s/R<([^<>]*)>/$1/g;
 426     s/[BI]<>//g;
 427     s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
 428     s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
 429
 430     # Extract footnotes.  This has to be done after all other
 431     # processing because otherwise the regexp will choke on formatting
 432     # inside @footnote.
 433     while (/\@footnote/g) {
 434         s/\@footnote\{([^\}]+)\}/[$fnno]/;
 435         add_footnote($1, $fnno);
 436         $fnno++;
 437     }
 438
 439     return $_;
 440 }
 441
 442 sub unmunge
 443 {
 444     # Replace escaped symbols with their equivalents.
 445     local $_ = $_[0];
 446
 447     s/&lt;/E<lt>/g;
 448     s/&gt;/E<gt>/g;
 449     s/&lbrace;/\{/g;
 450     s/&rbrace;/\}/g;
 451     s/&at;/\@/g;
 452     s/&amp;/&/g;
 453     return $_;
 454 }
 455
 456 sub add_footnote
 457 {
 458     unless (exists $sects{FOOTNOTES}) {
 459         $sects{FOOTNOTES} = "\n=over 4\n\n";
 460     }
 461
 462     $sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
 463     $sects{FOOTNOTES} .= $_[0];
 464     $sects{FOOTNOTES} .= "\n\n";
 465 }
 466
 467 # stolen from Symbol.pm
 468 {
 469     my $genseq = 0;
 470     sub gensym
 471     {
 472         my $name = "GEN" . $genseq++;
 473         my $ref = \*{$name};
 474         delete $::{$name};
 475         return $ref;
 476     }
 477 }