#! /usr/bin/perl -w # Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. # This file is part of GNU CC. # GNU CC is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # GNU CC 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 General Public License for more details. # You should have received a copy of the GNU General Public License # along with GNU CC; see the file COPYING. If not, write to # the Free Software Foundation, 51 Franklin Street, Fifth Floor, # Boston, MA 02110-1301 USA # This does trivial (and I mean _trivial_) conversion of Texinfo # markup to Perl POD format. It's intended to be used to extract # something suitable for a manpage from a Texinfo document. $output = 0; $skipping = 0; %sects = (); $section = ""; @icstack = (); @endwstack = (); @skstack = (); @instack = (); $shift = ""; %defs = (); $fnno = 1; $inf = ""; $ibase = ""; while ($_ = shift) { if (/^-D(.*)$/) { if ($1 ne "") { $flag = $1; } else { $flag = shift; } $value = ""; ($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/); die "no flag specified for -D\n" unless $flag ne ""; die "flags may only contain letters, digits, hyphens, dashes and underscores\n" unless $flag =~ /^[a-zA-Z0-9_-]+$/; $defs{$flag} = $value; } elsif (/^-/) { usage(); } else { $in = $_, next unless defined $in; $out = $_, next unless defined $out; usage(); } } if (defined $in) { $inf = gensym(); open($inf, "<$in") or die "opening \"$in\": $!\n"; $ibase = $1 if $in =~ m|^(.+)/[^/]+$|; } else { $inf = \*STDIN; } if (defined $out) { open(STDOUT, ">$out") or die "opening \"$out\": $!\n"; } while(defined $inf) { while(<$inf>) { # Certain commands are discarded without further processing. /^\@(?: [a-z]+index # @*index: useful only in complete manual |need # @need: useful only in printed manual |(?:end\s+)?group # @group .. @end group: ditto |page # @page: ditto |node # @node: useful only in .info file |(?:end\s+)?ifnottex # @ifnottex .. @end ifnottex: use contents )\b/x and next; chomp; # Look for filename and title markers. /^\@setfilename\s+([^.]+)/ and $fn = $1, next; /^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next; # Identify a man title but keep only the one we are interested in. /^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do { if (exists $defs{$1}) { $fn = $1; $tl = postprocess($2); } next; }; # Look for blocks surrounded by @c man begin SECTION ... @c man end. # This really oughta be @ifman ... @end ifman and the like, but such # would require rev'ing all other Texinfo translators. /^\@c\s+man\s+begin\s+([A-Z]+)\s+([A-Za-z0-9-]+)/ and do { $output = 1 if exists $defs{$2}; $sect = $1; next; }; /^\@c\s+man\s+begin\s+([A-Z]+)/ and $sect = $1, $output = 1, next; /^\@c\s+man\s+end/ and do { $sects{$sect} = "" unless exists $sects{$sect}; $sects{$sect} .= postprocess($section); $section = ""; $output = 0; next; }; # handle variables /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and do { $defs{$1} = $2; next; }; /^\@clear\s+([a-zA-Z0-9_-]+)/ and do { delete $defs{$1}; next; }; next unless $output; # Discard comments. (Can't do it above, because then we'd never see # @c man lines.) /^\@c\b/ and next; # End-block handler goes up here because it needs to operate even # if we are skipping. /^\@end\s+([a-z]+)/ and do { # Ignore @end foo, where foo is not an operation which may # cause us to skip, if we are presently skipping. my $ended = $1; next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex)$/; die "\@end $ended without \@$ended at line $.\n" unless defined $endw; die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw; $endw = pop @endwstack; if ($ended =~ /^(?:ifset|ifclear|ignore|menu|iftex)$/) { $skipping = pop @skstack; next; } elsif ($ended =~ /^(?:example|smallexample|display)$/) { $shift = ""; $_ = ""; # need a paragraph break } elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) { $_ = "\n=back\n"; $ic = pop @icstack; } else { die "unknown command \@end $ended at line $.\n"; } }; # We must handle commands which can cause skipping even while we # are skipping, otherwise we will not process nested conditionals # correctly. /^\@ifset\s+([a-zA-Z0-9_-]+)/ and do { push @endwstack, $endw; push @skstack, $skipping; $endw = "ifset"; $skipping = 1 unless exists $defs{$1}; next; }; /^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do { push @endwstack, $endw; push @skstack, $skipping; $endw = "ifclear"; $skipping = 1 if exists $defs{$1}; next; }; /^\@(ignore|menu|iftex)\b/ and do { push @endwstack, $endw; push @skstack, $skipping; $endw = $1; $skipping = 1; next; }; next if $skipping; # Character entities. First the ones that can be replaced by raw text # or discarded outright: s/\@copyright\{\}/(c)/g; s/\@dots\{\}/.../g; s/\@enddots\{\}/..../g; s/\@([.!? ])/$1/g; s/\@[:-]//g; s/\@bullet(?:\{\})?/*/g; s/\@TeX\{\}/TeX/g; s/\@pounds\{\}/\#/g; s/\@minus(?:\{\})?/-/g; s/\\,/,/g; # Now the ones that have to be replaced by special escapes # (which will be turned back into text by unmunge()) s/&/&/g; s/\@\{/{/g; s/\@\}/}/g; s/\@\@/&at;/g; # Inside a verbatim block, handle @var specially. if ($shift ne "") { s/\@var\{([^\}]*)\}/<$1>/g; } # POD doesn't interpret E<> inside a verbatim block. if ($shift eq "") { s/</</g; s/>/>/g; } else { s/</</g; s/>/>/g; } # Single line command handlers. /^\@include\s+(.+)$/ and do { push @instack, $inf; $inf = gensym(); # Try cwd and $ibase. open($inf, "<" . $1) or open($inf, "<" . $ibase . "/" . $1) or die "cannot open $1 or $ibase/$1: $!\n"; next; }; /^\@(?:section|unnumbered|unnumberedsec|center)\s+(.+)$/ and $_ = "\n=head2 $1\n"; /^\@subsection\s+(.+)$/ and $_ = "\n=head3 $1\n"; # Block command handlers: /^\@itemize\s+(\@[a-z]+|\*|-)/ and do { push @endwstack, $endw; push @icstack, $ic; $ic = $1; $_ = "\n=over 4\n"; $endw = "itemize"; }; /^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do { push @endwstack, $endw; push @icstack, $ic; if (defined $1) { $ic = $1 . "."; } else { $ic = "1."; } $_ = "\n=over 4\n"; $endw = "enumerate"; }; /^\@([fv]?table)\s+(\@[a-z]+)/ and do { push @endwstack, $endw; push @icstack, $ic; $endw = $1; $ic = $2; $ic =~ s/\@(?:samp|strong|key|gcctabopt|option|env)/B/; $ic =~ s/\@(?:code|kbd)/C/; $ic =~ s/\@(?:dfn|var|emph|cite|i)/I/; $ic =~ s/\@(?:file)/F/; $_ = "\n=over 4\n"; }; /^\@((?:small)?example|display)/ and do { push @endwstack, $endw; $endw = $1; $shift = "\t"; $_ = ""; # need a paragraph break }; /^\@itemx?\s*(.+)?$/ and do { if (defined $1) { # Entity escapes prevent munging by the <> processing below. $_ = "\n=item $ic\<$1\>\n"; } else { $_ = "\n=item $ic\n"; $ic =~ y/A-Ya-y/B-Zb-z/; $ic =~ s/(\d+)/$1 + 1/eg; } }; $section .= $shift.$_."\n"; } # End of current file. close($inf); $inf = pop @instack; } die "No filename or title\n" unless defined $fn && defined $tl; $sects{NAME} = "$fn \- $tl\n"; $sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES}; for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES ENVIRONMENT FILES BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) { if(exists $sects{$sect}) { $head = $sect; $head =~ s/SEEALSO/SEE ALSO/; print "=head1 $head\n\n"; print scalar unmunge ($sects{$sect}); print "\n"; } } sub usage { die "usage: $0 [-D toggle...] [infile [outfile]]\n"; } sub postprocess { local $_ = $_[0]; # @value{foo} is replaced by whatever 'foo' is defined as. while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) { if (! exists $defs{$2}) { print STDERR "Option $2 not defined\n"; s/\Q$1\E//; } else { $value = $defs{$2}; s/\Q$1\E/$value/; } } # Formatting commands. # Temporary escape for @r. s/\@r\{([^\}]*)\}/R<$1>/g; s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g; s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g; s/\@(?:gccoptlist|samp|strong|key|option|env|command|b)\{([^\}]*)\}/B<$1>/g; s/\@sc\{([^\}]*)\}/\U$1/g; s/\@file\{([^\}]*)\}/F<$1>/g; s/\@w\{([^\}]*)\}/S<$1>/g; s/\@(?:dmn|math)\{([^\}]*)\}/$1/g; # Cross references are thrown away, as are @noindent and @refill. # (@noindent is impossible in .pod, and @refill is unnecessary.) # @* is also impossible in .pod; we discard it and any newline that # follows it. Similarly, our macro @gol must be discarded. s/\(?\@xref\{(?:[^\}]*)\}(?:[^.<]|(?:<[^<>]*>))*\.\)?//g; s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g; s/;\s+\@pxref\{(?:[^\}]*)\}//g; s/\@noindent\s*//g; s/\@refill//g; s/\@gol//g; s/\@\*\s*\n?//g; # @uref can take one, two, or three arguments, with different # semantics each time. @url and @email are just like @uref with # one argument, for our purposes. s/\@(?:uref|url|email)\{([^\},]*)\}/<B<$1>>/g; s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g; s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g; # Turn B<blah I<blah> blah> into B<blah> I<blah> B<blah> to # match Texinfo semantics of @emph inside @samp. Also handle @r # inside bold. s/</</g; s/>/>/g; 1 while s/B<((?:[^<>]|I<[^<>]*>)*)R<([^>]*)>/B<$1>${2}B</g; 1 while (s/B<([^<>]*)I<([^>]+)>/B<$1>I<$2>B</g); 1 while (s/I<([^<>]*)B<([^>]+)>/I<$1>B<$2>I</g); s/[BI]<>//g; s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g; s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g; # Extract footnotes. This has to be done after all other # processing because otherwise the regexp will choke on formatting # inside @footnote. while (/\@footnote/g) { s/\@footnote\{([^\}]+)\}/[$fnno]/; add_footnote($1, $fnno); $fnno++; } return $_; } sub unmunge { # Replace escaped symbols with their equivalents. local $_ = $_[0]; s/</E<lt>/g; s/>/E<gt>/g; s/{/\{/g; s/}/\}/g; s/&at;/\@/g; s/&/&/g; return $_; } sub add_footnote { unless (exists $sects{FOOTNOTES}) { $sects{FOOTNOTES} = "\n=over 4\n\n"; } $sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++; $sects{FOOTNOTES} .= $_[0]; $sects{FOOTNOTES} .= "\n\n"; } # stolen from Symbol.pm { my $genseq = 0; sub gensym { my $name = "GEN" . $genseq++; my $ref = \*{$name}; delete $::{$name}; return $ref; } }