[qemu.git] / scripts / texi2pod.pl

#! /usr/bin/perl -w

#   Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.

# This file is part of GCC.

# GCC 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.

# GCC 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 GCC; see the file COPYING.  If not,
# see <http://www.gnu.org/licenses/>.

# 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 = "";
@ipath = ();
$encoding = undef;
@args = ();

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} = $value;
    } elsif (/^-I(.*)$/) {
	if ($1 ne "") {
	    $flag = $1;
	} else {
	    $flag = shift;
	}
        push (@ipath, $flag);
    } 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;

    # Look for document encoding
    /^\@documentencoding\s+([^.]+)/ and do {
        $encoding = $1 unless defined $encoding;
        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 && $ended !~ /^(?:ifset|ifclear|ignore|menu|iftex|copying)$/;

	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
                            |quotation|deftp|deftypefn)$/x) {
	    $shift = "";
	    $_ = "";	# need a paragraph break
	} elsif ($ended =~ /^(?:itemize|enumerate|[fv]?table)$/) {
	    $_ = "\n=back\n";
	    $ic = pop @icstack;
	} elsif ($ended eq "multitable") {
	    $_ = "\n=back\n";
	} 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|copying)\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/&/&amp;/g;
    s/\@\{/&lbrace;/g;
    s/\@\}/&rbrace;/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/</&lt;/g;
	s/>/&gt;/g;
    } else {
	s/</&LT;/g;
	s/>/&GT;/g;
    }

    # Single line command handlers.

    /^\@include\s+(.+)$/ and do {
	push @instack, $inf;
	$inf = gensym();
	$file = postprocess($1);

	# Try cwd and $ibase, then explicit -I paths.
	$done = 0;
	foreach $path ("", $ibase, @ipath) {
	    $mypath = $file;
	    $mypath = $path . "/" . $mypath if ($path ne "");
	    open($inf, "<" . $mypath) and ($done = 1, last);
	}
	die "cannot find $file" if !$done;
	next;
    };

    /^\@(?:section|unnumbered|unnumberedsec|center)\s+(.+)$/
	and $_ = "\n=head2 $1\n";
    /^\@subsection\s+(.+)$/
	and $_ = "\n=head3 $1\n";
    /^\@subsubsection\s+(.+)$/
	and $_ = "\n=head4 $1\n";

    # Block command handlers:
    /^\@itemize(?:\s+(\@[a-z]+|\*|-))?/ and do {
	push @endwstack, $endw;
	push @icstack, $ic;
	if (defined $1) {
	    $ic = $1;
	} else {
	    $ic = '*';
	}
	$_ = "\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";
    };

    /^\@multitable\s.*/ and do {
	push @endwstack, $endw;
	$endw = "multitable";
	$_ = "\n=over 4\n";
    };

    /^\@([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/;
	$ic =~ s/\@(?:asis)//;
	$_ = "\n=over 4\n";
    };

    /^\@((?:small)?example|display)/ and do {
	push @endwstack, $endw;
	$endw = $1;
	$shift = "\t";
	$_ = "";	# need a paragraph break
    };

    /^\@item\s+(.*\S)\s*$/ and $endw eq "multitable" and do {
	@columns = ();
	for $column (split (/\s*\@tab\s*/, $1)) {
	    # @strong{...} is used a @headitem work-alike
	    $column =~ s/^\@strong\{(.*)\}$/$1/;
	    push @columns, $column;
	}
	$_ = "\n=item ".join (" : ", @columns)."\n";
    };

    /^\@(quotation)\s*(.+)?$/ and do {
        push @endwstack, $endw;
        $endw = $1;
        $_ = "\n$2:"
    };

    /^{(.*)}$|^(.*)$/ and $#args > 0 and do {
        $kind = $args[0];
        $arguments = $1 // "";
        if ($endw eq "deftypefn") {
            $ret = $args[1];
            $fname = "B<$args[2]>";
            $_ = $ret ? "$ret " : "";
            $_ .= "$fname $arguments ($kind)";
        } else {
            $_ = "B<$args[1]> ($kind)\n\n$arguments";
        }
        @args = ();
    };

    /^\@(deftp)\s*(.+)?$/ and do {
        push @endwstack, $endw;
        $endw = $1;
        $arg = $2;
        $arg =~ s/{([^}]*)}/$1/g;
        $arg =~ s/\@$//;
        @args = split (/ /, $arg);
        $_ = "";
    };

    /^\@(deftypefn)\s*(.+)?$/ and do {
        push @endwstack, $endw;
        $endw = $1;
        $arg = $2;
        $arg =~ s/{([^}]*)}/$1/g;
        $arg =~ s/\@$//;
        @args = split (/ /, $arg);
        $_ = "";
    };

    /^\@itemx?\s*(.+)?$/ and do {
	if (defined $1) {
            if ($ic eq "") {
                $_ = "\n=item $1\n";
            } else {
                # Entity escapes prevent munging by the <> processing below.
                $_ = "\n=item $ic\&LT;$1\&GT;\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;

print "=encoding $encoding\n\n" if defined $encoding;

$sects{NAME} = "$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.
    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/\@t\{([^\}]*)\}/$1/g;
    s/\@(?:dmn|math)\{([^\}]*)\}/$1/g;

    # keep references of the form @ref{...}, print them bold
    s/\@(?:ref)\{([^\}]*)\}/B<$1>/g;

    # Change double single quotes to double quotes.
    s/''/"/g;
    s/``/"/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;

    # Anchors are thrown away
    s/\@anchor\{(?:[^\}]*)\}//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;

    # Un-escape <> at this point.
    s/&LT;/</g;
    s/&GT;/>/g;

    # Now un-nest all B<>, I<>, R<>.  Theoretically we could have
    # indefinitely deep nesting; in practice, one level suffices.
    1 while s/([BIR])<([^<>]*)([BIR])<([^<>]*)>/$1<$2>$3<$4>$1</g;

    # Replace R<...> with bare ...; eliminate empty markup, B<>;
    # shift white space at the ends of [BI]<...> expressions outside
    # the expression.
    s/R<([^<>]*)>/$1/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";
}

# stolen from Symbol.pm
{
    my $genseq = 0;
    sub gensym
    {
	my $name = "GEN" . $genseq++;
	my $ref = \*{$name};
	delete $::{$name};
	return $ref;
    }
}
Commit	Line	Data
5a67135a FB	1	#! /usr/bin/perl -w
5a67135a FB	2
3aba3d86	3	# Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
5a67135a	4
3aba3d86	5	# This file is part of GCC.
5a67135a	6
3aba3d86	7	# GCC is free software; you can redistribute it and/or modify
5a67135a FB	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
3aba3d86	12	# GCC is distributed in the hope that it will be useful,
5a67135a FB	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
8167ee88 BS	18	# along with GCC; see the file COPYING. If not,
8167ee88 BS	19	# see <http://www.gnu.org/licenses/>.
5a67135a FB	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 = "";
3aba3d86	38	@ipath = ();
3179d694	39	$encoding = undef;
eaea2bf7	40	@args = ();
5a67135a FB	41
	42	while ($_ = shift) {
	43	if (/^-D(.*)$/) {
	44	if ($1 ne "") {
	45	$flag = $1;
	46	} else {
	47	$flag = shift;
	48	}
	49	$value = "";
	50	($flag, $value) = ($flag =~ /^([^=]+)(?:=(.+))?/);
	51	die "no flag specified for -D\n"
	52	unless $flag ne "";
	53	die "flags may only contain letters, digits, hyphens, dashes and underscores\n"
	54	unless $flag =~ /^[a-zA-Z0-9_-]+$/;
	55	$defs{$flag} = $value;
3aba3d86 TS	56	} elsif (/^-I(.*)$/) {
	57	if ($1 ne "") {
	58	$flag = $1;
	59	} else {
	60	$flag = shift;
	61	}
	62	push (@ipath, $flag);
5a67135a FB	63	} elsif (/^-/) {
	64	usage();
	65	} else {
	66	$in = $_, next unless defined $in;
	67	$out = $_, next unless defined $out;
	68	usage();
	69	}
	70	}
	71
	72	if (defined $in) {
	73	$inf = gensym();
	74	open($inf, "<$in") or die "opening \"$in\": $!\n";
	75	$ibase = $1 if $in =~ m\|^(.+)/[^/]+$\|;
	76	} else {
	77	$inf = \*STDIN;
	78	}
	79
	80	if (defined $out) {
	81	open(STDOUT, ">$out") or die "opening \"$out\": $!\n";
	82	}
	83
	84	while(defined $inf) {
	85	while(<$inf>) {
	86	# Certain commands are discarded without further processing.
	87	/^\@(?:
	88	[a-z]+index # @*index: useful only in complete manual
	89	\|need # @need: useful only in printed manual
	90	\|(?:end\s+)?group # @group .. @end group: ditto
	91	\|page # @page: ditto
	92	\|node # @node: useful only in .info file
	93	\|(?:end\s+)?ifnottex # @ifnottex .. @end ifnottex: use contents
	94	)\b/x and next;
	95
	96	chomp;
	97
	98	# Look for filename and title markers.
	99	/^\@setfilename\s+([^.]+)/ and $fn = $1, next;
	100	/^\@settitle\s+([^.]+)/ and $tl = postprocess($1), next;
	101
3179d694 MT	102	# Look for document encoding
	103	/^\@documentencoding\s+([^.]+)/ and do {
	104	$encoding = $1 unless defined $encoding;
	105	next;
	106	};
	107
5a67135a FB	108	# Identify a man title but keep only the one we are interested in.
	109	/^\@c\s+man\s+title\s+([A-Za-z0-9-]+)\s+(.+)/ and do {
	110	if (exists $defs{$1}) {
	111	$fn = $1;
	112	$tl = postprocess($2);
	113	}
	114	next;
	115	};
	116
	117	# Look for blocks surrounded by @c man begin SECTION ... @c man end.
	118	# This really oughta be @ifman ... @end ifman and the like, but such
	119	# would require rev'ing all other Texinfo translators.
	120	/^\@c\s+man\s+begin\s+([A-Z]+)\s+([A-Za-z0-9-]+)/ and do {
	121	$output = 1 if exists $defs{$2};
	122	$sect = $1;
	123	next;
	124	};
	125	/^\@c\s+man\s+begin\s+([A-Z]+)/ and $sect = $1, $output = 1, next;
	126	/^\@c\s+man\s+end/ and do {
	127	$sects{$sect} = "" unless exists $sects{$sect};
	128	$sects{$sect} .= postprocess($section);
	129	$section = "";
	130	$output = 0;
	131	next;
	132	};
	133
	134	# handle variables
	135	/^\@set\s+([a-zA-Z0-9_-]+)\s(.)$/ and do {
	136	$defs{$1} = $2;
	137	next;
	138	};
	139	/^\@clear\s+([a-zA-Z0-9_-]+)/ and do {
	140	delete $defs{$1};
	141	next;
	142	};
	143
	144	next unless $output;
	145
	146	# Discard comments. (Can't do it above, because then we'd never see
	147	# @c man lines.)
	148	/^\@c\b/ and next;
	149
	150	# End-block handler goes up here because it needs to operate even
	151	# if we are skipping.
	152	/^\@end\s+([a-z]+)/ and do {
	153	# Ignore @end foo, where foo is not an operation which may
	154	# cause us to skip, if we are presently skipping.
	155	my $ended = $1;
3aba3d86	156	next if $skipping && $ended !~ /^(?:ifset\|ifclear\|ignore\|menu\|iftex\|copying)$/;
5a67135a FB	157
	158	die "\@end $ended without \@$ended at line $.\n" unless defined $endw;
	159	die "\@$endw ended by \@end $ended at line $.\n" unless $ended eq $endw;
	160
	161	$endw = pop @endwstack;
	162
	163	if ($ended =~ /^(?:ifset\|ifclear\|ignore\|menu\|iftex)$/) {
	164	$skipping = pop @skstack;
	165	next;
eaea2bf7 MAL	166	} elsif ($ended =~ /^(?:example\|smallexample\|display
eaea2bf7 MAL	167	\|quotation\|deftp\|deftypefn)$/x) {
5a67135a FB	168	$shift = "";
	169	$_ = ""; # need a paragraph break
	170	} elsif ($ended =~ /^(?:itemize\|enumerate\|[fv]?table)$/) {
	171	$_ = "\n=back\n";
	172	$ic = pop @icstack;
3aba3d86 TS	173	} elsif ($ended eq "multitable") {
3aba3d86 TS	174	$_ = "\n=back\n";
5a67135a FB	175	} else {
	176	die "unknown command \@end $ended at line $.\n";
	177	}
	178	};
	179
	180	# We must handle commands which can cause skipping even while we
	181	# are skipping, otherwise we will not process nested conditionals
	182	# correctly.
	183	/^\@ifset\s+([a-zA-Z0-9_-]+)/ and do {
	184	push @endwstack, $endw;
	185	push @skstack, $skipping;
	186	$endw = "ifset";
	187	$skipping = 1 unless exists $defs{$1};
	188	next;
	189	};
	190
	191	/^\@ifclear\s+([a-zA-Z0-9_-]+)/ and do {
	192	push @endwstack, $endw;
	193	push @skstack, $skipping;
	194	$endw = "ifclear";
	195	$skipping = 1 if exists $defs{$1};
	196	next;
	197	};
	198
3aba3d86	199	/^\@(ignore\|menu\|iftex\|copying)\b/ and do {
5a67135a FB	200	push @endwstack, $endw;
	201	push @skstack, $skipping;
	202	$endw = $1;
	203	$skipping = 1;
	204	next;
	205	};
	206
	207	next if $skipping;
	208
	209	# Character entities. First the ones that can be replaced by raw text
	210	# or discarded outright:
	211	s/\@copyright\{\}/(c)/g;
	212	s/\@dots\{\}/.../g;
	213	s/\@enddots\{\}/..../g;
	214	s/\@([.!? ])/$1/g;
	215	s/\@[:-]//g;
	216	s/\@bullet(?:\{\})?/*/g;
	217	s/\@TeX\{\}/TeX/g;
	218	s/\@pounds\{\}/\#/g;
	219	s/\@minus(?:\{\})?/-/g;
	220	s/\\,/,/g;
	221
	222	# Now the ones that have to be replaced by special escapes
	223	# (which will be turned back into text by unmunge())
	224	s/&/&/g;
	225	s/\@\{/{/g;
	226	s/\@\}/}/g;
	227	s/\@\@/&at;/g;
	228
	229	# Inside a verbatim block, handle @var specially.
	230	if ($shift ne "") {
	231	s/\@var\{([^\}]*)\}/<$1>/g;
	232	}
	233
	234	# POD doesn't interpret E<> inside a verbatim block.
	235	if ($shift eq "") {
	236	s/</</g;
	237	s/>/>/g;
	238	} else {
	239	s/</&LT;/g;
	240	s/>/&GT;/g;
	241	}
	242
	243	# Single line command handlers.
	244
	245	/^\@include\s+(.+)$/ and do {
	246	push @instack, $inf;
	247	$inf = gensym();
3aba3d86 TS	248	$file = postprocess($1);
	249
	250	# Try cwd and $ibase, then explicit -I paths.
	251	$done = 0;
	252	foreach $path ("", $ibase, @ipath) {
	253	$mypath = $file;
	254	$mypath = $path . "/" . $mypath if ($path ne "");
	255	open($inf, "<" . $mypath) and ($done = 1, last);
	256	}
	257	die "cannot find $file" if !$done;
5a67135a FB	258	next;
	259	};
	260
	261	/^\@(?:section\|unnumbered\|unnumberedsec\|center)\s+(.+)$/
	262	and $_ = "\n=head2 $1\n";
	263	/^\@subsection\s+(.+)$/
	264	and $_ = "\n=head3 $1\n";
3aba3d86 TS	265	/^\@subsubsection\s+(.+)$/
3aba3d86 TS	266	and $_ = "\n=head4 $1\n";
5a67135a FB	267
5a67135a FB	268	# Block command handlers:
3aba3d86	269	/^\@itemize(?:\s+(\@[a-z]+\|\*\|-))?/ and do {
5a67135a FB	270	push @endwstack, $endw;
5a67135a FB	271	push @icstack, $ic;
3aba3d86 TS	272	if (defined $1) {
	273	$ic = $1;
	274	} else {
	275	$ic = '*';
	276	}
5a67135a FB	277	$_ = "\n=over 4\n";
	278	$endw = "itemize";
	279	};
	280
	281	/^\@enumerate(?:\s+([a-zA-Z0-9]+))?/ and do {
	282	push @endwstack, $endw;
	283	push @icstack, $ic;
	284	if (defined $1) {
	285	$ic = $1 . ".";
	286	} else {
	287	$ic = "1.";
	288	}
	289	$_ = "\n=over 4\n";
	290	$endw = "enumerate";
	291	};
	292
3aba3d86 TS	293	/^\@multitable\s.*/ and do {
	294	push @endwstack, $endw;
	295	$endw = "multitable";
	296	$_ = "\n=over 4\n";
	297	};
	298
5a67135a FB	299	/^\@([fv]?table)\s+(\@[a-z]+)/ and do {
	300	push @endwstack, $endw;
	301	push @icstack, $ic;
	302	$endw = $1;
	303	$ic = $2;
	304	$ic =~ s/\@(?:samp\|strong\|key\|gcctabopt\|option\|env)/B/;
	305	$ic =~ s/\@(?:code\|kbd)/C/;
	306	$ic =~ s/\@(?:dfn\|var\|emph\|cite\|i)/I/;
	307	$ic =~ s/\@(?:file)/F/;
eaea2bf7	308	$ic =~ s/\@(?:asis)//;
5a67135a FB	309	$_ = "\n=over 4\n";
	310	};
	311
	312	/^\@((?:small)?example\|display)/ and do {
	313	push @endwstack, $endw;
	314	$endw = $1;
	315	$shift = "\t";
	316	$_ = ""; # need a paragraph break
	317	};
	318
3aba3d86 TS	319	/^\@item\s+(.\S)\s$/ and $endw eq "multitable" and do {
	320	@columns = ();
	321	for $column (split (/\s\@tab\s/, $1)) {
	322	# @strong{...} is used a @headitem work-alike
aa5ccadc	323	$column =~ s/^\@strong\{(.*)\}$/$1/;
3aba3d86 TS	324	push @columns, $column;
	325	}
	326	$_ = "\n=item ".join (" : ", @columns)."\n";
	327	};
	328
eaea2bf7 MAL	329	/^\@(quotation)\s*(.+)?$/ and do {
	330	push @endwstack, $endw;
	331	$endw = $1;
	332	$_ = "\n$2:"
	333	};
	334
	335	/^{(.)}$\|^(.)$/ and $#args > 0 and do {
	336	$kind = $args[0];
	337	$arguments = $1 // "";
	338	if ($endw eq "deftypefn") {
	339	$ret = $args[1];
	340	$fname = "B<$args[2]>";
	341	$_ = $ret ? "$ret " : "";
	342	$_ .= "$fname $arguments ($kind)";
	343	} else {
	344	$_ = "B<$args[1]> ($kind)\n\n$arguments";
	345	}
	346	@args = ();
	347	};
	348
	349	/^\@(deftp)\s*(.+)?$/ and do {
	350	push @endwstack, $endw;
	351	$endw = $1;
	352	$arg = $2;
	353	$arg =~ s/{([^}]*)}/$1/g;
	354	$arg =~ s/\@$//;
	355	@args = split (/ /, $arg);
	356	$_ = "";
	357	};
	358
	359	/^\@(deftypefn)\s*(.+)?$/ and do {
	360	push @endwstack, $endw;
	361	$endw = $1;
	362	$arg = $2;
	363	$arg =~ s/{([^}]*)}/$1/g;
	364	$arg =~ s/\@$//;
	365	@args = split (/ /, $arg);
	366	$_ = "";
	367	};
	368
5a67135a FB	369	/^\@itemx?\s*(.+)?$/ and do {
5a67135a FB	370	if (defined $1) {
eaea2bf7 MAL	371	if ($ic eq "") {
	372	$_ = "\n=item $1\n";
	373	} else {
	374	# Entity escapes prevent munging by the <> processing below.
	375	$_ = "\n=item $ic\&LT;$1\&GT;\n";
	376	}
5a67135a FB	377	} else {
	378	$_ = "\n=item $ic\n";
	379	$ic =~ y/A-Ya-y/B-Zb-z/;
	380	$ic =~ s/(\d+)/$1 + 1/eg;
	381	}
	382	};
	383
	384	$section .= $shift.$_."\n";
	385	}
	386	# End of current file.
	387	close($inf);
	388	$inf = pop @instack;
	389	}
	390
	391	die "No filename or title\n" unless defined $fn && defined $tl;
	392
3179d694 MT	393	print "=encoding $encoding\n\n" if defined $encoding;
3179d694 MT	394
5a67135a FB	395	$sects{NAME} = "$fn \- $tl\n";
	396	$sects{FOOTNOTES} .= "=back\n" if exists $sects{FOOTNOTES};
	397
	398	for $sect (qw(NAME SYNOPSIS DESCRIPTION OPTIONS ENVIRONMENT FILES
	399	BUGS NOTES FOOTNOTES SEEALSO AUTHOR COPYRIGHT)) {
	400	if(exists $sects{$sect}) {
	401	$head = $sect;
	402	$head =~ s/SEEALSO/SEE ALSO/;
	403	print "=head1 $head\n\n";
	404	print scalar unmunge ($sects{$sect});
	405	print "\n";
	406	}
	407	}
	408
	409	sub usage
	410	{
	411	die "usage: $0 [-D toggle...] [infile [outfile]]\n";
	412	}
	413
	414	sub postprocess
	415	{
	416	local $_ = $_[0];
	417
	418	# @value{foo} is replaced by whatever 'foo' is defined as.
	419	while (m/(\@value\{([a-zA-Z0-9_-]+)\})/g) {
	420	if (! exists $defs{$2}) {
	421	print STDERR "Option $2 not defined\n";
	422	s/\Q$1\E//;
	423	} else {
	424	$value = $defs{$2};
	425	s/\Q$1\E/$value/;
	426	}
	427	}
	428
	429	# Formatting commands.
	430	# Temporary escape for @r.
	431	s/\@r\{([^\}]*)\}/R<$1>/g;
	432	s/\@(?:dfn\|var\|emph\|cite\|i)\{([^\}]*)\}/I<$1>/g;
	433	s/\@(?:code\|kbd)\{([^\}]*)\}/C<$1>/g;
	434	s/\@(?:gccoptlist\|samp\|strong\|key\|option\|env\|command\|b)\{([^\}]*)\}/B<$1>/g;
	435	s/\@sc\{([^\}]*)\}/\U$1/g;
	436	s/\@file\{([^\}]*)\}/F<$1>/g;
	437	s/\@w\{([^\}]*)\}/S<$1>/g;
eaea2bf7	438	s/\@t\{([^\}]*)\}/$1/g;
5a67135a FB	439	s/\@(?:dmn\|math)\{([^\}]*)\}/$1/g;
5a67135a FB	440
3aba3d86 TS	441	# keep references of the form @ref{...}, print them bold
	442	s/\@(?:ref)\{([^\}]*)\}/B<$1>/g;
	443
	444	# Change double single quotes to double quotes.
	445	s/''/"/g;
	446	s/``/"/g;
	447
5a67135a FB	448	# Cross references are thrown away, as are @noindent and @refill.
	449	# (@noindent is impossible in .pod, and @refill is unnecessary.)
	450	# @* is also impossible in .pod; we discard it and any newline that
	451	# follows it. Similarly, our macro @gol must be discarded.
	452
	453	s/\(?\@xref\{(?:[^\}])\}(?:[^.<]\|(?:<[^<>]>))*\.\)?//g;
	454	s/\s+\(\@pxref\{(?:[^\}]*)\}\)//g;
	455	s/;\s+\@pxref\{(?:[^\}]*)\}//g;
	456	s/\@noindent\s*//g;
	457	s/\@refill//g;
	458	s/\@gol//g;
	459	s/\@\\s\n?//g;
	460
3aba3d86 TS	461	# Anchors are thrown away
	462	s/\@anchor\{(?:[^\}]*)\}//g;
	463
5a67135a FB	464	# @uref can take one, two, or three arguments, with different
	465	# semantics each time. @url and @email are just like @uref with
	466	# one argument, for our purposes.
	467	s/\@(?:uref\|url\|email)\{([^\},]*)\}/<B<$1>>/g;
	468	s/\@uref\{([^\},]),([^\},])\}/$2 (C<$1>)/g;
	469	s/\@uref\{([^\},]),([^\},]),([^\},]*)\}/$3/g;
	470
3aba3d86	471	# Un-escape <> at this point.
5a67135a FB	472	s/&LT;/</g;
5a67135a FB	473	s/&GT;/>/g;
3aba3d86 TS	474
	475	# Now un-nest all B<>, I<>, R<>. Theoretically we could have
	476	# indefinitely deep nesting; in practice, one level suffices.
	477	1 while s/([BIR])<([^<>])([BIR])<([^<>])>/$1<$2>$3<$4>$1</g;
	478
	479	# Replace R<...> with bare ...; eliminate empty markup, B<>;
	480	# shift white space at the ends of [BI]<...> expressions outside
	481	# the expression.
	482	s/R<([^<>]*)>/$1/g;
5a67135a FB	483	s/[BI]<>//g;
	484	s/([BI])<(\s+)([^>]+)>/$2$1<$3>/g;
	485	s/([BI])<([^>]+?)(\s+)>/$1<$2>$3/g;
	486
	487	# Extract footnotes. This has to be done after all other
	488	# processing because otherwise the regexp will choke on formatting
	489	# inside @footnote.
	490	while (/\@footnote/g) {
	491	s/\@footnote\{([^\}]+)\}/[$fnno]/;
	492	add_footnote($1, $fnno);
	493	$fnno++;
	494	}
	495
	496	return $_;
	497	}
	498
	499	sub unmunge
	500	{
	501	# Replace escaped symbols with their equivalents.
	502	local $_ = $_[0];
	503
	504	s/</E<lt>/g;
	505	s/>/E<gt>/g;
	506	s/{/\{/g;
	507	s/}/\}/g;
	508	s/&at;/\@/g;
	509	s/&/&/g;
	510	return $_;
	511	}
	512
	513	sub add_footnote
	514	{
	515	unless (exists $sects{FOOTNOTES}) {
	516	$sects{FOOTNOTES} = "\n=over 4\n\n";
	517	}
	518
	519	$sects{FOOTNOTES} .= "=item $fnno.\n\n"; $fnno++;
	520	$sects{FOOTNOTES} .= $_[0];
	521	$sects{FOOTNOTES} .= "\n\n";
	522	}
	523
	524	# stolen from Symbol.pm
	525	{
	526	my $genseq = 0;
	527	sub gensym
	528	{
	529	my $name = "GEN" . $genseq++;
	530	my $ref = \*{$name};
	531	delete $::{$name};
	532	return $ref;
	533	}
	534	}