| 1 | #! /usr/bin/perl -w
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| 2 |
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| 3 | # Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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| 4 |
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| 5 | # This file is part of GNU CC.
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| 6 |
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| 7 | # GNU CC is free software; you can redistribute it and/or modify
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| 8 | # it under the terms of the GNU General Public License as published by
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| 9 | # the Free Software Foundation; either version 2, or (at your option)
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| 10 | # any later version.
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| 11 |
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| 12 | # GNU CC is distributed in the hope that it will be useful,
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | # GNU General Public License for more details.
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| 16 |
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| 17 | # You should have received a copy of the GNU General Public License
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| 18 | # along with GNU CC; see the file COPYING. If not, write to
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| 19 | # the Free Software Foundation, 59 Temple Place - Suite 330,
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| 20 | # Boston MA 02111-1307, USA.
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| 21 |
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| 22 | # This does trivial (and I mean _trivial_) conversion of Texinfo
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| 23 | # markup to Perl POD format. It's intended to be used to extract
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| 24 | # something suitable for a manpage from a Texinfo document.
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| 25 |
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| 26 | $output = 0;
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| 27 | $skipping = 0;
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| 28 | %sects = ();
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| 29 | $section = "";
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| 30 | @icstack = ();
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| 31 | @endwstack = ();
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| 32 | @skstack = ();
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| 33 | @instack = ();
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| 34 | $shift = "";
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| 35 | %defs = ();
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| 36 | $fnno = 1;
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| 37 | $inf = "";
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| 38 | $ibase = "";
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| 39 |
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| 40 | while ($_ = shift) {
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| 41 | if (/^-D(.*)$/) {
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| 42 | if ($1 ne "") {
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| 43 | $flag = $1;
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| 44 | } else {
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| 45 | $flag = shift;
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| 46 | }
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| 47 | $value = "";
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| 48 | ($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/);
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| 49 | die "no flag specified for -D\n"
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| 50 | unless $flag ne "";
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| 51 | die "flags may only contain letters, digits, hyphens, dashes and underscores\n"
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| 52 | unless $flag =~ /^[a-zA-Z0-9_-]+$/;
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| 53 | $defs{$flag} = $value;
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| 54 | } elsif (/^-/) {
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| 55 | usage();
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| 56 | } else {
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| 57 | $in = $_, next unless defined $in;
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| 58 | $out = $_, next unless defined $out;
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| 59 | usage();
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | if (defined $in) {
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| 64 | $inf = gensym();
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| 65 | open($inf, "<$in") or die "opening \"$in\": $!\n";
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| 66 | $ibase = $1 if $in =~ m|^(.+)/[^/]+$|;
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| 67 | } else {
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| 68 | $inf = \*STDIN;
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| 69 | }
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| 70 |
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| 71 | if (defined $out) {
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| 72 | open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
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| 73 | }
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| 74 |
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| 75 | while(defined $inf) {
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| 76 | while(<$inf>) {
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| 77 | # Certain commands are discarded without further processing.
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| 78 | /^\@(?:
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| 79 | [a-z]+index # @*index: useful only in complete manual
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| 80 | |need # @need: useful only in printed manual
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| 81 | |(?:end\s+)?group # @group .. @end group: ditto
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| 82 | |page # @page: ditto
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| 83 | |node # @node: useful only in .info file
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| 84 | |(?:end\s+)?ifnottex # @ifnottex .. @end ifnottex: use contents
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| 85 | )\b/x and next;
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| 86 |
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| 87 | chomp;
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| 88 |
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| 89 | # Look for filename and title markers.
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| 90 | /^\@setfilename\s+([^.]+)/ and $fn = $1, next;
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| 91 | /^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next;
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| 92 |
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| 93 | # Identify a man title but keep only the one we are interested in.
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| 94 | /^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do {
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| 95 | if (exists $defs{$1}) {
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| 96 | $fn = $1;
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| 97 | $tl = postprocess($2);
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| 98 | }
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| 99 | next;
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| 100 | };
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| 101 |
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| 102 | # Look for blocks surrounded by @c man begin SECTION ... @c man end.
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| 103 | # This really oughta be @ifman ... @end ifman and the like, but such
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| 104 | # would require rev'ing all other Texinfo translators.
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| 105 | /^\@c\s+man\s+begin\s+([A-Z]+)\s+([A-Za-z0-9-]+)/ and do {
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| 106 | $output = 1 if exists $defs{$2};
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| 107 | $sect = $1;
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| 108 | next;
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| 109 | };
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| 110 | /^\@c\s+man\s+begin\s+([A-Z]+)/ and $sect = $1, $output = 1, next;
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| 111 | /^\@c\s+man\s+end/ and do {
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| 112 | $sects{$sect} = "" unless exists $sects{$sect};
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| 113 | $sects{$sect} .= postprocess($section);
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| 114 | $section = "";
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| 115 | $output = 0;
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| 116 | next;
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| 117 | };
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| 118 |
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| 119 | # handle variables
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| 120 | /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and do {
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| 121 | $defs{$1} = $2;
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| 122 | next;
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| 123 | };
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| 124 | /^\@clear\s+([a-zA-Z0-9_-]+)/ and do {
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| 125 | delete $defs{$1};
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| 126 | next;
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| 127 | };
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| 128 |
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| 129 | next unless $output;
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| 130 |
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| 131 | # Discard comments. (Can't do it above, because then we'd never see
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| 132 | # @c man lines.)
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| 133 | /^\@c\b/ and next;
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| 134 |
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| 135 | # End-block handler goes up here because it needs to operate even
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| 136 | # if we are skipping.
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| 137 | /^\@end\s+([a-z]+)/ and do {
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| 138 | # Ignore @end foo, where foo is not an operation which may
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| 139 | # cause us to skip, if we are presently skipping.
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| 140 | my $ended = $1;
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| 141 | next if $skipping && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex|copying)$/;
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| 142 |
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| 143 | die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
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| 144 | die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
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| 145 |
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| 146 | $endw = pop @endwstack;
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| 147 |
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| 148 | if ($ended =~ /^(?:ifset|ifclear|ignore|menu|iftex)$/) {
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| 149 | $skipping = pop @skstack;
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| 150 | next;
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| 151 | } elsif ($ended =~ /^(?:example|smallexample|display)$/) {
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| 152 | $shift = "";
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| 153 | $_ = ""; # need a paragraph break
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| 154 | } elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) {
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| 155 | $_ = "\n=back\n";
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| 156 | $ic = pop @icstack;
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| 157 | } else {
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| 158 | die "unknown command \@end $ended at line $.\n";
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| 159 | }
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| 160 | };
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| 161 |
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| 162 | # We must handle commands which can cause skipping even while we
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| 163 | # are skipping, otherwise we will not process nested conditionals
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| 164 | # correctly.
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| 165 | /^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
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| 166 | push @endwstack, $endw;
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| 167 | push @skstack, $skipping;
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| 168 | $endw = "ifset";
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| 169 | $skipping = 1 unless exists $defs{$1};
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| 170 | next;
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| 171 | };
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| 172 |
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| 173 | /^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
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| 174 | push @endwstack, $endw;
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| 175 | push @skstack, $skipping;
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| 176 | $endw = "ifclear";
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| 177 | $skipping = 1 if exists $defs{$1};
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| 178 | next;
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| 179 | };
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| 180 |
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| 181 | /^\@(ignore|menu|iftex|copying)\b/ and do {
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| 182 | push @endwstack, $endw;
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| 183 | push @skstack, $skipping;
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| 184 | $endw = $1;
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| 185 | $skipping = 1;
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| 186 | next;
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| 187 | };
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| 188 |
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| 189 | next if $skipping;
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| 190 |
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| 191 | # Character entities. First the ones that can be replaced by raw text
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| 192 | # or discarded outright:
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| 193 | s/\@copyright\{\}/(c)/g;
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| 194 | s/\@dots\{\}/.../g;
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| 195 | s/\@enddots\{\}/..../g;
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| 196 | s/\@([.!? ])/$1/g;
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| 197 | s/\@[:-]//g;
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| 198 | s/\@bullet(?:\{\})?/*/g;
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| 199 | s/\@TeX\{\}/TeX/g;
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| 200 | s/\@pounds\{\}/\#/g;
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| 201 | s/\@minus(?:\{\})?/-/g;
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| 202 | s/\\,/,/g;
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| 203 |
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| 204 | # Now the ones that have to be replaced by special escapes
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| 205 | # (which will be turned back into text by unmunge())
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| 206 | s/&/&/g;
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| 207 | s/\@\{/{/g;
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| 208 | s/\@\}/}/g;
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| 209 | s/\@\@/&at;/g;
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| 210 |
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| 211 | # Inside a verbatim block, handle @var specially.
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| 212 | if ($shift ne "") {
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| 213 | s/\@var\{([^\}]*)\}/<$1>/g;
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| 214 | }
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| 215 |
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| 216 | # POD doesn't interpret E<> inside a verbatim block.
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| 217 | if ($shift eq "") {
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| 218 | s/</</g;
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| 219 | s/>/>/g;
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| 220 | } else {
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| 221 | s/</</g;
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| 222 | s/>/>/g;
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| 223 | }
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| 224 |
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| 225 | # Single line command handlers.
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| 226 |
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| 227 | /^\@include\s+(.+)$/ and do {
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| 228 | push @instack, $inf;
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| 229 | $inf = gensym();
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| 230 |
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| 231 | # Try cwd and $ibase.
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| 232 | open($inf, "<" . $1)
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| 233 | or open($inf, "<" . $ibase . "/" . $1)
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| 234 | or die "cannot open $1 or $ibase/$1: $!\n";
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| 235 | next;
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| 236 | };
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| 237 |
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| 238 | /^\@(?:section|unnumbered|unnumberedsec|center)\s+(.+)$/
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| 239 | and $_ = "\n=head2 $1\n";
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| 240 | /^\@subsection\s+(.+)$/
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| 241 | and $_ = "\n=head3 $1\n";
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| 242 |
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| 243 | # Block command handlers:
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| 244 | /^\@itemize\s+(\@[a-z]+|\*|-)/ and do {
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| 245 | push @endwstack, $endw;
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| 246 | push @icstack, $ic;
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| 247 | $ic = $1;
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| 248 | $_ = "\n=over 4\n";
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| 249 | $endw = "itemize";
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| 250 | };
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| 251 |
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| 252 | /^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do {
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| 253 | push @endwstack, $endw;
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| 254 | push @icstack, $ic;
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| 255 | if (defined $1) {
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| 256 | $ic = $1 . ".";
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| 257 | } else {
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| 258 | $ic = "1.";
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| 259 | }
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| 260 | $_ = "\n=over 4\n";
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| 261 | $endw = "enumerate";
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| 262 | };
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| 263 |
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| 264 | /^\@([fv]?table)\s+(\@[a-z]+)/ and do {
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| 265 | push @endwstack, $endw;
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| 266 | push @icstack, $ic;
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| 267 | $endw = $1;
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| 268 | $ic = $2;
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| 269 | $ic =~ s/\@(?:samp|strong|key|gcctabopt|env)/B/;
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| 270 | $ic =~ s/\@(?:code|kbd)/C/;
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| 271 | $ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
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| 272 | $ic =~ s/\@(?:file)/F/;
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| 273 | $_ = "\n=over 4\n";
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| 274 | };
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| 275 |
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| 276 | /^\@((?:small)?example|display)/ and do {
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| 277 | push @endwstack, $endw;
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| 278 | $endw = $1;
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| 279 | $shift = "\t";
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| 280 | $_ = ""; # need a paragraph break
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| 281 | };
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| 282 |
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| 283 | /^\@itemx?\s*(.+)?$/ and do {
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| 284 | if (defined $1) {
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| 285 | # Entity escapes prevent munging by the <> processing below.
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| 286 | $_ = "\n=item $ic\<$1\>\n";
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| 287 | } else {
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| 288 | $_ = "\n=item $ic\n";
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| 289 | $ic =~ y/A-Ya-y/B-Zb-z/;
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| 290 | $ic =~ s/(\d+)/$1 + 1/eg;
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| 291 | }
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| 292 | };
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| 293 |
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| 294 | $section .= $shift.$_."\n";
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| 295 | }
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| 296 | # End of current file.
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| 297 | close($inf);
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| 298 | $inf = pop @instack;
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| 299 | }
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| 300 |
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| 301 | die "No filename or title\n" unless defined $fn && defined $tl;
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| 302 |
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| 303 | $sects{NAME} = "$fn \- $tl\n";
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| 304 | $sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
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| 305 |
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| 306 | for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
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| 307 | BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
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| 308 | if(exists $sects{$sect}) {
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| 309 | $head = $sect;
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| 310 | $head =~ s/SEEALSO/SEE ALSO/;
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| 311 | print "=head1 $head\n\n";
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| 312 | print scalar unmunge ($sects{$sect});
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| 313 | print "\n";
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| 314 | }
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| 315 | }
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| 316 |
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| 317 | sub usage
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| 318 | {
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| 319 | die "usage: $0 [-D toggle...] [infile [outfile]]\n";
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| 320 | }
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| 321 |
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| 322 | sub postprocess
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| 323 | {
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| 324 | local $_ = $_[0];
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| 325 |
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| 326 | # @value{foo} is replaced by whatever 'foo' is defined as.
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| 327 | while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) {
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| 328 | if (! exists $defs{$2}) {
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| 329 | print STDERR "Option $2 not defined\n";
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| 330 | s/\Q$1\E//;
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| 331 | } else {
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| 332 | $value = $defs{$2};
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| 333 | s/\Q$1\E/$value/;
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| 334 | }
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| 335 | }
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| 336 |
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| 337 | # Formatting commands.
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| 338 | # Temporary escape for @r.
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| 339 | s/\@r\{([^\}]*)\}/R<$1>/g;
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| 340 | s/\@(?:dfn|var|emph|cite|i)\{([^\}]*)\}/I<$1>/g;
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| 341 | s/\@(?:code|kbd)\{([^\}]*)\}/C<$1>/g;
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| 342 | s/\@(?:gccoptlist|samp|strong|key|option|env|command|b)\{([^\}]*)\}/B<$1>/g;
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| 343 | s/\@sc\{([^\}]*)\}/\U$1/g;
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| 344 | s/\@file\{([^\}]*)\}/F<$1>/g;
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| 345 | s/\@w\{([^\}]*)\}/S<$1>/g;
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| 346 | s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;
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| 347 |
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| 348 | # keep references of the form @ref{...}, print them bold
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| 349 | s/\@(?:ref)\{([^\}]*)\}/B<$1>/g;
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| 350 |
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| 351 | # Cross references are thrown away, as are @noindent and @refill.
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| 352 | # (@noindent is impossible in .pod, and @refill is unnecessary.)
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| 353 | # @* is also impossible in .pod; we discard it and any newline that
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| 354 | # follows it. Similarly, our macro @gol must be discarded.
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| 355 |
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| 356 | s/\(?\@xref\{(?:[^\}]*)\}(?:[^.<]|(?:<[^<>]*>))*\.\)?//g;
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| 357 | s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
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| 358 | s/;\s+\@pxref\{(?:[^\}]*)\}//g;
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| 359 | s/\@noindent\s*//g;
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| 360 | s/\@refill//g;
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| 361 | s/\@gol//g;
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| 362 | s/\@\*\s*\n?//g;
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| 363 |
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| 364 | # @uref can take one, two, or three arguments, with different
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| 365 | # semantics each time. @url and @email are just like @uref with
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| 366 | # one argument, for our purposes.
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| 367 | s/\@(?:uref|url|email)\{([^\},]*)\}/<B<$1>>/g;
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| 368 | s/\@uref\{([^\},]*),([^\},]*)\}/$2 (C<$1>)/g;
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| 369 | s/\@uref\{([^\},]*),([^\},]*),([^\},]*)\}/$3/g;
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| 370 |
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| 371 | # Un-escape <> at this point.
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| 372 | s/</</g;
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| 373 | s/>/>/g;
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| 374 |
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| 375 | # Now un-nest all B<>, I<>, R<>. Theoretically we could have
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| 376 | # indefinitely deep nesting; in practice, one level suffices.
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| 377 | 1 while s/([BIR])<([^<>]*)([BIR])<([^<>]*)>/$1<$2>$3<$4>$1</g;
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| 378 |
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| 379 | # Replace R<...> with bare ...; eliminate empty markup, B<>;
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| 380 | # shift white space at the ends of [BI]<...> expressions outside
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| 381 | # the expression.
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| 382 | s/R<([^<>]*)>/$1/g;
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| 383 | s/[BI]<>//g;
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| 384 | s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
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| 385 | s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
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| 386 |
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| 387 | # Extract footnotes. This has to be done after all other
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| 388 | # processing because otherwise the regexp will choke on formatting
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| 389 | # inside @footnote.
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| 390 | while (/\@footnote/g) {
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| 391 | s/\@footnote\{([^\}]+)\}/[$fnno]/;
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| 392 | add_footnote($1, $fnno);
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| 393 | $fnno++;
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| 394 | }
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| 395 |
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| 396 | return $_;
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| 397 | }
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| 398 |
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| 399 | sub unmunge
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| 400 | {
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| 401 | # Replace escaped symbols with their equivalents.
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| 402 | local $_ = $_[0];
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| 403 |
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| 404 | s/</E<lt>/g;
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| 405 | s/>/E<gt>/g;
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| 406 | s/{/\{/g;
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| 407 | s/}/\}/g;
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| 408 | s/&at;/\@/g;
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| 409 | s/&/&/g;
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| 410 | return $_;
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| 411 | }
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| 412 |
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| 413 | sub add_footnote
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| 414 | {
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| 415 | unless (exists $sects{FOOTNOTES}) {
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| 416 | $sects{FOOTNOTES} = "\n=over 4\n\n";
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| 417 | }
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| 418 |
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| 419 | $sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
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| 420 | $sects{FOOTNOTES} .= $_[0];
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| 421 | $sects{FOOTNOTES} .= "\n\n";
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| 422 | }
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| 423 |
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| 424 | # stolen from Symbol.pm
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| 425 | {
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| 426 | my $genseq = 0;
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| 427 | sub gensym
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| 428 | {
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| 429 | my $name = "GEN" . $genseq++;
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| 430 | my $ref = \*{$name};
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| 431 | delete $::{$name};
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| 432 | return $ref;
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| 433 | }
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| 434 | }
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