[gcc.git] / contrib / texi2pod.pl

#! /usr/bin/perl -w

# 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.

use v5.6.0;

$output = 0;
$skipping = 0;
%sects = ();
$section = "";
@icstack = ();
@endwstack = ();
@skstack = ();
$shift = "";
%defs = ();
$fnno = 1;

while ($_ = shift) {
    if (/^-D(.*)$/) {
	if ($1 ne "") {
	    $flag = $1;
	} else {
	    $flag = shift;
	}
	die "no flag specified for -D\n"
	    unless $flag ne "";
	die "flags may only contain letters, digits, hyphens, and underscores\n"
	    unless $flag =~ /^[a-zA-Z0-9_-]+$/;
	$defs{$flag} = "";
    } elsif (/^-/) {
	usage();
    } else {
	$in = $_, next unless defined $in;
	$out = $_, next unless defined $out;
	usage();
    }
}

if (defined $in) {
    open(STDIN, $in) or die "opening \"$in\": $!\n";
}
if (defined $out) {
    open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
}

while(<STDIN>)
{
    # 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
	)\b/x and next;
    
    chomp;

    # Look for filename and title markers.
    /^\@setfilename\s+([^.]+)/ and $fn = $1, next;
    /^\@settitle\s+([^.]+)/ and $tl = $1, 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 man begin ([A-Z]+)/ and $sect = $1, $output = 1, next;
    /^\@c man end/ and do {
	$sects{$sect} = "" unless exists $sects{$sect};
	$sects{$sect} .= postprocess($section);
	$section = "";
	$output = 0;
	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 && $ended !~ /^(?:ifset|ifclear|ignore|menu)$/;

	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 ($ended =~ /^(?:ifset|ifclear|ignore|menu)$/) {
	    $skipping = pop @skstack;
	    next;
	} elsif ($ended =~ /^(?:example|smallexample)$/) {
	    $shift = "";
	    $_ = "";	# need a paragraph break
	} elsif ($ended =~ /^(?:itemize|enumerate|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)\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;

    # Now the ones that have to be replaced by special escapes
    # (which will be turned back into text by unmunge())
    s/&/&amp;/g;
    s/\@\{/&lbrace;/g;
    s/\@\}/&rbrace;/g;
    s/\@\@/&at;/g;
    # POD doesn't interpret E<> inside a verbatim block.
    if ($shift eq "") {
	s/</&lt;/g;
	s/>/&gt;/g;
    } else {
	s/</&LT;/g;
	s/>/&GT;/g;
    }

    # Single line command handlers.
    /^\@set\s+([a-zA-Z0-9_-]+)\s*(.*)$/ and $defs{$1} = $2, next;
    /^\@clear\s+([a-zA-Z0-9_-]+)/ and delete $defs{$1}, next;

    /^\@section\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-Z0-9]+))?/ and do {
	push @endwstack, $endw;
	push @icstack, $ic;
	if (defined $1) {
	    $ic = $1 . ".";
	} else {
	    $ic = "1.";
	}
	$_ = "\n=over 4\n";
	$endw = "enumerate";
    };

    /^\@table\s+(\@[a-z]+)/ and do {
	push @endwstack, $endw;
	push @icstack, $ic;
	$ic = $1;
	$ic =~ s/\@(?:samp|strong|key|gcctabopt|env)/B/;
	$ic =~ s/\@(?:code|kbd)/C/;
	$ic =~ s/\@(?:dfn|var|emph|cite|i)/I/;
	$ic =~ s/\@(?:file)/F/;
	$_ = "\n=over 4\n";
	$endw = "table";
    };

    /^\@((?:small)?example)/ 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\&LT;$1\&GT;\n";
	} else {
	    $_ = "\n=item $ic\n";
	    $ic =~ y/A-Ya-y1-8/B-Zb-z2-9/;
	}
    };

    $section .= $shift.$_."\n";
}

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 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.
    s/\@value\{([a-zA-Z0-9_-]+)\}/$defs{$1}/g;

    # 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;

    # Handle @r inside bold.
    1 while s/B<((?:[^<>]*|I<[^<>*]*>)*)R<([^>]*)>/B<$1>${2}B</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)\{([^\},]*)\}/&lt;B<$1>&gt;/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.
    s/&LT;/</g;
    s/&GT;/>/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/&lt;/E<lt>/g;
    s/&gt;/E<gt>/g;
    s/&lbrace;/\{/g;
    s/&rbrace;/\}/g;
    s/&at;/\@/g;
    s/&amp;/&/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";
}
Commit	Line	Data
6251188c ZW	1	#! /usr/bin/perl -w
	2
	3	# This does trivial (and I mean _trivial_) conversion of Texinfo
	4	# markup to Perl POD format. It's intended to be used to extract
	5	# something suitable for a manpage from a Texinfo document.
	6
150d3c00 JM	7	use v5.6.0;
150d3c00 JM	8
6251188c	9	$output = 0;
3d6f4d76	10	$skipping = 0;
6251188c ZW	11	%sects = ();
	12	$section = "";
	13	@icstack = ();
	14	@endwstack = ();
3d6f4d76	15	@skstack = ();
6251188c	16	$shift = "";
3d6f4d76	17	%defs = ();
b75d998f	18	$fnno = 1;
6251188c	19
b75d998f	20	while ($_ = shift) {
3d6f4d76 ZW	21	if (/^-D(.*)$/) {
	22	if ($1 ne "") {
	23	$flag = $1;
	24	} else {
	25	$flag = shift;
	26	}
	27	die "no flag specified for -D\n"
	28	unless $flag ne "";
	29	die "flags may only contain letters, digits, hyphens, and underscores\n"
	30	unless $flag =~ /^[a-zA-Z0-9_-]+$/;
	31	$defs{$flag} = "";
	32	} elsif (/^-/) {
	33	usage();
	34	} else {
	35	$in = $_, next unless defined $in;
	36	$out = $_, next unless defined $out;
	37	usage();
	38	}
	39	}
	40
	41	if (defined $in) {
	42	open(STDIN, $in) or die "opening \"$in\": $!\n";
	43	}
	44	if (defined $out) {
	45	open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
	46	}
	47
	48	while(<STDIN>)
6251188c	49	{
b75d998f ZW	50	# Certain commands are discarded without further processing.
	51	/^\@(?:
	52	[a-z]+index # @*index: useful only in complete manual
	53	\|need # @need: useful only in printed manual
	54	\|(?:end\s+)?group # @group .. @end group: ditto
	55	\|page # @page: ditto
	56	\|node # @node: useful only in .info file
	57	)\b/x and next;
	58
6251188c	59	chomp;
b75d998f ZW	60
	61	# Look for filename and title markers.
	62	/^\@setfilename\s+([^.]+)/ and $fn = $1, next;
	63	/^\@settitle\s+([^.]+)/ and $tl = $1, next;
	64
	65	# Look for blocks surrounded by @c man begin SECTION ... @c man end.
	66	# This really oughta be @ifman ... @end ifman and the like, but such
	67	# would require rev'ing all other Texinfo translators.
6251188c ZW	68	/^\@c man begin ([A-Z]+)/ and $sect = $1, $output = 1, next;
6251188c ZW	69	/^\@c man end/ and do {
f4e8dec6 ZW	70	$sects{$sect} = "" unless exists $sects{$sect};
f4e8dec6 ZW	71	$sects{$sect} .= postprocess($section);
6251188c ZW	72	$section = "";
	73	$output = 0;
	74	next;
	75	};
b75d998f	76	next unless $output;
3d6f4d76	77
b75d998f ZW	78	# Discard comments. (Can't do it above, because then we'd never see
	79	# @c man lines.)
	80	/^\@c\b/ and next;
6251188c	81
b75d998f ZW	82	# End-block handler goes up here because it needs to operate even
	83	# if we are skipping.
	84	/^\@end\s+([a-z]+)/ and do {
f4e8dec6 ZW	85	# Ignore @end foo, where foo is not an operation which may
	86	# cause us to skip, if we are presently skipping.
	87	my $ended = $1;
	88	next if $skipping && $ended !~ /^(?:ifset\|ifclear\|ignore\|menu)$/;
	89
	90	die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
	91	die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
6251188c	92
b75d998f	93	$endw = pop @endwstack;
6251188c	94
f4e8dec6	95	if ($ended =~ /^(?:ifset\|ifclear\|ignore\|menu)$/) {
b75d998f ZW	96	$skipping = pop @skstack;
b75d998f ZW	97	next;
f4e8dec6 ZW	98	} elsif ($ended =~ /^(?:example\|smallexample)$/) {
	99	$shift = "";
	100	$_ = ""; # need a paragraph break
	101	} elsif ($ended =~ /^(?:itemize\|enumerate\|table)$/) {
b75d998f ZW	102	$_ = "\n=back\n";
b75d998f ZW	103	$ic = pop @icstack;
f4e8dec6 ZW	104	} else {
f4e8dec6 ZW	105	die "unknown command \@end $ended at line $.\n";
3d6f4d76 ZW	106	}
3d6f4d76 ZW	107	};
f4e8dec6 ZW	108
	109	# We must handle commands which can cause skipping even while we
	110	# are skipping, otherwise we will not process nested conditionals
	111	# correctly.
	112	/^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
	113	push @endwstack, $endw;
	114	push @skstack, $skipping;
	115	$endw = "ifset";
	116	$skipping = 1 unless exists $defs{$1};
	117	next;
	118	};
	119
	120	/^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
	121	push @endwstack, $endw;
	122	push @skstack, $skipping;
	123	$endw = "ifclear";
	124	$skipping = 1 if exists $defs{$1};
	125	next;
	126	};
	127
	128	/^\@(ignore\|menu)\b/ and do {
	129	push @endwstack, $endw;
	130	push @skstack, $skipping;
	131	$endw = $1;
	132	$skipping = 1;
	133	next;
	134	};
	135
3d6f4d76 ZW	136	next if $skipping;
3d6f4d76 ZW	137
b75d998f ZW	138	# Character entities. First the ones that can be replaced by raw text
	139	# or discarded outright:
	140	s/\@copyright\{\}/(c)/g;
	141	s/\@dots\{\}/.../g;
	142	s/\@enddots\{\}/..../g;
	143	s/\@([.!? ])/$1/g;
	144	s/\@[:-]//g;
	145	s/\@bullet(?:\{\})?/*/g;
	146	s/\@TeX\{\}/TeX/g;
	147	s/\@pounds\{\}/\#/g;
	148	s/\@minus(?:\{\})?/-/g;
6251188c	149
b75d998f ZW	150	# Now the ones that have to be replaced by special escapes
	151	# (which will be turned back into text by unmunge())
	152	s/&/&/g;
	153	s/\@\{/{/g;
	154	s/\@\}/}/g;
	155	s/\@\@/&at;/g;
	156	# POD doesn't interpret E<> inside a verbatim block.
	157	if ($shift eq "") {
	158	s/</</g;
	159	s/>/>/g;
	160	} else {
	161	s/</&LT;/g;
	162	s/>/&GT;/g;
	163	}
	164
	165	# Single line command handlers.
3d6f4d76 ZW	166	/^\@set\s+([a-zA-Z0-9_-]+)\s(.)$/ and $defs{$1} = $2, next;
	167	/^\@clear\s+([a-zA-Z0-9_-]+)/ and delete $defs{$1}, next;
	168
b75d998f ZW	169	/^\@section\s+(.+)$/ and $_ = "\n=head2 $1\n";
	170	/^\@subsection\s+(.+)$/ and $_ = "\n=head3 $1\n";
	171
	172	# Block command handlers:
b75d998f	173	/^\@itemize\s+(\@[a-z]+\|\*\|-)/ and do {
6251188c ZW	174	push @endwstack, $endw;
	175	push @icstack, $ic;
	176	$ic = $1;
6251188c ZW	177	$_ = "\n=over 4\n";
	178	$endw = "itemize";
	179	};
	180
b75d998f	181	/^\@enumerate(?:\s+([A-Z0-9]+))?/ and do {
6251188c ZW	182	push @endwstack, $endw;
6251188c ZW	183	push @icstack, $ic;
b75d998f ZW	184	if (defined $1) {
	185	$ic = $1 . ".";
	186	} else {
	187	$ic = "1.";
	188	}
6251188c ZW	189	$_ = "\n=over 4\n";
	190	$endw = "enumerate";
	191	};
	192
	193	/^\@table\s+(\@[a-z]+)/ and do {
	194	push @endwstack, $endw;
	195	push @icstack, $ic;
	196	$ic = $1;
2642624b	197	$ic =~ s/\@(?:samp\|strong\|key\|gcctabopt\|env)/B/;
6251188c	198	$ic =~ s/\@(?:code\|kbd)/C/;
b75d998f	199	$ic =~ s/\@(?:dfn\|var\|emph\|cite\|i)/I/;
6251188c ZW	200	$ic =~ s/\@(?:file)/F/;
	201	$_ = "\n=over 4\n";
	202	$endw = "table";
	203	};
	204
	205	/^\@((?:small)?example)/ and do {
	206	push @endwstack, $endw;
	207	$endw = $1;
	208	$shift = "\t";
f4e8dec6	209	$_ = ""; # need a paragraph break
6251188c ZW	210	};
6251188c ZW	211
6251188c	212	/^\@itemx?\s*(.+)?$/ and do {
b75d998f ZW	213	if (defined $1) {
	214	# Entity escapes prevent munging by the <> processing below.
	215	$_ = "\n=item $ic\&LT;$1\&GT;\n";
	216	} else {
	217	$_ = "\n=item $ic\n";
6251188c ZW	218	$ic =~ y/A-Ya-y1-8/B-Zb-z2-9/;
	219	}
	220	};
3d6f4d76	221
6251188c ZW	222	$section .= $shift.$_."\n";
	223	}
	224
b75d998f ZW	225	die "No filename or title\n" unless defined $fn && defined $tl;
b75d998f ZW	226
6251188c	227	$sects{NAME} = "$fn \- $tl\n";
b75d998f	228	$sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
6251188c ZW	229
6251188c ZW	230	for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
b75d998f ZW	231	BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
b75d998f ZW	232	if(exists $sects{$sect}) {
6251188c ZW	233	$head = $sect;
	234	$head =~ s/SEEALSO/SEE ALSO/;
	235	print "=head1 $head\n\n";
b75d998f	236	print scalar unmunge ($sects{$sect});
6251188c ZW	237	print "\n";
	238	}
	239	}
3d6f4d76 ZW	240
	241	sub usage
	242	{
	243	die "usage: $0 [-D toggle...] [infile [outfile]]\n";
	244	}
b75d998f ZW	245
	246	sub postprocess
	247	{
	248	local $_ = $_[0];
	249
	250	# @value{foo} is replaced by whatever 'foo' is defined as.
	251	s/\@value\{([a-zA-Z0-9_-]+)\}/$defs{$1}/g;
	252
	253	# Formatting commands.
4bc1997b JM	254	# Temporary escape for @r.
4bc1997b JM	255	s/\@r\{([^\}]*)\}/R<$1>/g;
b75d998f ZW	256	s/\@(?:dfn\|var\|emph\|cite\|i)\{([^\}]*)\}/I<$1>/g;
b75d998f ZW	257	s/\@(?:code\|kbd)\{([^\}]*)\}/C<$1>/g;
4bc1997b	258	s/\@(?:gccoptlist\|samp\|strong\|key\|option\|env\|command\|b)\{([^\}]*)\}/B<$1>/g;
b75d998f ZW	259	s/\@sc\{([^\}]*)\}/\U$1/g;
	260	s/\@file\{([^\}]*)\}/F<$1>/g;
	261	s/\@w\{([^\}]*)\}/S<$1>/g;
	262	s/\@(?:dmn\|math)\{([^\}]*)\}/$1/g;
	263
4bc1997b JM	264	# Handle @r inside bold.
	265	1 while s/B<((?:[^<>]\|I<[^<>]>))R<([^>]*)>/B<$1>${2}B</g;
	266
b75d998f ZW	267	# Cross references are thrown away, as are @noindent and @refill.
	268	# (@noindent is impossible in .pod, and @refill is unnecessary.)
	269	# @* is also impossible in .pod; we discard it and any newline that
4bc1997b	270	# follows it. Similarly, our macro @gol must be discarded.
b75d998f	271
4bc1997b	272	s/\(?\@xref\{(?:[^\}])\}(?:[^.<]\|(?:<[^<>]>))*\.\)?//g;
b75d998f ZW	273	s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
	274	s/;\s+\@pxref\{(?:[^\}]*)\}//g;
	275	s/\@noindent\s*//g;
	276	s/\@refill//g;
4bc1997b	277	s/\@gol//g;
b75d998f ZW	278	s/\@\\s\n?//g;
	279
	280	# @uref can take one, two, or three arguments, with different
	281	# semantics each time. @url and @email are just like @uref with
	282	# one argument, for our purposes.
2642624b	283	s/\@(?:uref\|url\|email)\{([^\},]*)\}/<B<$1>>/g;
b75d998f ZW	284	s/\@uref\{([^\},]),([^\},])\}/$2 (C<$1>)/g;
	285	s/\@uref\{([^\},]),([^\},]),([^\},]*)\}/$3/g;
	286
	287	# Turn B<blah I<blah> blah> into B<blah> I<blah> B<blah> to
	288	# match Texinfo semantics of @emph inside @samp.
	289	s/&LT;/</g;
	290	s/&GT;/>/g;
	291	1 while (s/B<([^<>]*)I<([^>]+)>/B<$1>I<$2>B</g);
	292	1 while (s/I<([^<>]*)B<([^>]+)>/I<$1>B<$2>I</g);
	293	s/[BI]<>//g;
	294	s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
	295	s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
	296
	297	# Extract footnotes. This has to be done after all other
	298	# processing because otherwise the regexp will choke on formatting
	299	# inside @footnote.
	300	while (/\@footnote/g) {
	301	s/\@footnote\{([^\}]+)\}/[$fnno]/;
	302	add_footnote($1, $fnno);
	303	$fnno++;
	304	}
	305
	306	return $_;
	307	}
	308
	309	sub unmunge
	310	{
	311	# Replace escaped symbols with their equivalents.
	312	local $_ = $_[0];
	313
	314	s/</E<lt>/g;
	315	s/>/E<gt>/g;
	316	s/{/\{/g;
	317	s/}/\}/g;
	318	s/&at;/\@/g;
	319	s/&/&/g;
	320	return $_;
	321	}
	322
	323	sub add_footnote
	324	{
	325	unless (exists $sects{FOOTNOTES}) {
	326	$sects{FOOTNOTES} = "\n=over 4\n\n";
	327	}
	328
	329	$sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
	330	$sects{FOOTNOTES} .= $_[0];
	331	$sects{FOOTNOTES} .= "\n\n";
	332	}
	333