#!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
    if $running_under_some_shell;

require 5.003;

BEGIN { $^W = 0; } # get rid of nasty warnings

#   bootstrapping private installed modules
use lib "/usr/local/lib/wml/perl/lib";
use lib "/usr/local/lib/wml/perl/lib/mips64-openbsd";

##         _ _          
##     ___| (_) ___ ___ 
##    / __| | |/ __/ _ \
##    \__ \ | | (_|  __/
##    |___/_|_|\___\___|
##                    
##    Slice -- Extract out pre-defined slices of an ASCII file
##
##    The slice program reads an inputfile and divide its prepaired ASCII contents
##    into possibly overlapping slices. These slices are determined by enclosing
##    blocks which are defined by begin and end delimiters which have to be
##    already in the file.   The final output gets calculated by a slice term
##    consisting of slice names, set theory operators and optional round brackets.
##  
##    The latest release can be found on
##    http://www.engelschall.com/sw/slice/
##  
##    Copyright (c) 1997-2002 Ralf S. Engelschall.
##    Copyright (c) 1999-2002 Denis Barbier.
##  
##    This program is free software; it may be redistributed and/or modified only
##    under the terms of the GNU General Public License, which may be found in the
##    SLICE source distribution.  Look at the file COPYING.   This program 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 either the GNU General Public License for more
##    details.
##  
##                                Ralf S. Engelschall
##                                rse@engelschall.com
##                                www.engelschall.com


use Getopt::Long 2.13;
use IO::Handle 1.15;
use IO::File 1.07;
use Bit::Vector 5.0;

##
##  slice_vers.pl -- Version Information for Slice (syntax: Perl)
##  [automatically generated and maintained by GNU shtool]
##

my $slice_version = {
    'v_hex'   => 0x103208,
    'v_short' => "1.3.8",
    'v_long'  => "1.3.8 (10-Feb-2002)",
    'v_tex'   => "This is Slice, Version 1.3.8 (10-Feb-2002)",
    'v_gnu'   => "Slice 1.3.8 (10-Feb-2002)",
    'v_web'   => "Slice/1.3.8",
    'v_rcs'   => "\$Id: Slice 1.3.8 (10-Feb-2002) $/"
};


##
##  slice_util.pl -- Utility functions
##  Copyright (c) 1997-2002 Ralf S. Engelschall. 
##  Copyright (c) 1999-2002 Denis Barbier.
##

package main;

sub verbose {
    my ($str) = @_;

    if ($main::CFG->{OPT}->{X}) {
        $str =~ s|^|** Slice:Verbose: |mg;
        print STDERR $str;
    }
}

sub printerror {
    my ($str) = @_;

    $str =~ s|^|** Slice:Error: |mg;
    print STDERR $str;
}

sub error {
    my ($str) = @_;

    printerror($str);
    exit(1);
}

sub fileerror {
    my $file  = shift;
    my ($str) = @_;

    printerror($str);
    unlink $file;
    exit(1);
}

sub printwarning {
    my ($str) = @_;

    $str =~ s|^|** Slice:Warning: |mg;
    print STDERR $str;
}

##EOF##
package SliceTermParser;

package SliceTermParser;
$SLICE=257;
$YYERRCODE=256;
@yylhs = (                                               -1,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,
);
@yylen = (                                                2,
    1,    2,    2,    2,    3,    3,    3,    3,    3,    3,
    3,    3,    3,
);
@yydefred = (                                             0,
    0,    0,    0,    0,    0,    2,    3,    4,    0,    0,
    0,    0,    0,    0,    0,    0,    0,   13,    0,    0,
    0,    0,    0,    0,    9,   10,
);
@yydgoto = (                                              5,
);
@yysindex = (                                           -33,
  -60,  -33,  -33,  -33,   -7,    0,    0,    0,  -12,  -33,
  -33,  -33,  -33,  -33,  -33,  -33,  -33,    0,  -31,  -31,
   24,   24,  -36,  -36,    0,    0,
);
@yyrindex = (                                             0,
    2,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,   15,   17,
    9,   14,    3,    8,    0,    0,
);
@yygindex = (                                           135,
);
$YYTABLESIZE=224;
@yytable = (                                              2,
   17,    1,    5,    6,    0,   17,    4,    6,   11,    0,
    0,   13,    0,   12,    7,    0,    8,    0,    0,    0,
    0,    0,    0,    0,   17,    0,    0,    0,   18,   17,
   13,    0,   11,    0,    0,   13,    0,   11,    1,    0,
    0,    0,    1,    5,    1,    5,    1,    5,    6,   11,
    6,   11,    6,   11,   12,    7,   12,    8,   12,    7,
   17,    8,   15,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,   16,    0,    0,    0,    0,   16,   10,
    0,   15,    0,    0,   10,   12,   15,    0,   14,    0,
    0,    0,    3,    1,    5,    1,    5,   16,    0,    6,
   11,    6,   16,    0,   12,   12,    7,   14,    8,   12,
    0,    1,   14,    0,    0,    0,    0,   15,    1,    5,
    0,    1,    5,    0,    6,   11,    0,    6,    0,    0,
   12,    0,    0,   16,    0,    0,    7,    8,    9,    0,
    0,    0,    0,   14,   19,   20,   21,   22,   23,   24,
   25,   26,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
    0,    0,    0,    1,
);
@yycheck = (                                             33,
   37,    0,    0,   64,   -1,   37,   40,    0,    0,   -1,
   -1,   43,   -1,    0,    0,   -1,    0,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   37,   -1,   -1,   -1,   41,   37,
   43,   -1,   45,   -1,   -1,   43,   -1,   45,   37,   -1,
   -1,   -1,   41,   41,   43,   43,   45,   45,   41,   41,
   43,   43,   45,   45,   41,   41,   43,   41,   45,   45,
   37,   45,   94,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,  110,   -1,   -1,   -1,   -1,  110,   92,
   -1,   94,   -1,   -1,   92,  117,   94,   -1,  120,   -1,
   -1,   -1,  126,   92,   92,   94,   94,  110,   -1,   92,
   92,   94,  110,   -1,  117,   92,   92,  120,   92,  117,
   -1,  110,  120,   -1,   -1,   -1,   -1,   94,  117,  117,
   -1,  120,  120,   -1,  117,  117,   -1,  120,   -1,   -1,
  117,   -1,   -1,  110,   -1,   -1,    2,    3,    4,   -1,
   -1,   -1,   -1,  120,   10,   11,   12,   13,   14,   15,
   16,   17,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
   -1,   -1,   -1,  257,
);
$YYFINAL=5;
#ifndef YYDEBUG
#define YYDEBUG 0
#endif
$YYMAXTOKEN=257;
#if YYDEBUG
@yyname = (
"end-of-file",'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
"'!'",'','','',"'%'",'','',"'('","')'",'',"'+'",'',"'-'",'','','','','','','','','','','','','','','',
'','','',"'\@'",'','','','','','','','','','','','','','','','','','','','','','','','','','','',"'\\\\'",'',
"'^'",'','','','','','','','','','','','','','','',"'n'",'','','','','','',"'u'",'','',"'x'",'','','','','',
"'~'",'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','','',
'','','','','','','','','','','','','',"SLICE",
);
@yyrule = (
"\$accept : expr",
"expr : SLICE",
"expr : SLICE '\@'",
"expr : '!' expr",
"expr : '~' expr",
"expr : expr 'x' expr",
"expr : expr '^' expr",
"expr : expr '\\\\' expr",
"expr : expr '-' expr",
"expr : expr 'n' expr",
"expr : expr '%' expr",
"expr : expr 'u' expr",
"expr : expr '+' expr",
"expr : '(' expr ')'",
);
#endif
sub yyclearin {
  my  $p;
  ($p) = @_;
  $p->{yychar} = -1;
}
sub yyerrok {
  my  $p;
  ($p) = @_;
  $p->{yyerrflag} = 0;
}
sub new {
  my $p = bless {}, $_[0];
  $p->{yylex} = $_[1];
  $p->{yyerror} = $_[2];
  $p->{yydebug} = $_[3];
  return $p;
}
sub YYERROR {
  my  $p;
  ($p) = @_;
  ++$p->{yynerrs};
  $p->yy_err_recover;
}
sub yy_err_recover {
  my  $p;
  ($p) = @_;
  if ($p->{yyerrflag} < 3)
  {
    $p->{yyerrflag} = 3;
    while (1)
    {
      if (($p->{yyn} = $yysindex[$p->{yyss}->[$p->{yyssp}]]) && 
          ($p->{yyn} += $YYERRCODE) >= 0 && 
          $p->{yyn} <= $#yycheck &&
          $yycheck[$p->{yyn}] == $YYERRCODE)
      {
        warn("yydebug: state " . 
                     $p->{yyss}->[$p->{yyssp}] . 
                     ", error recovery shifting to state" . 
                     $yytable[$p->{yyn}] . "\n") 
                       if $p->{yydebug};
        $p->{yyss}->[++$p->{yyssp}] = 
          $p->{yystate} = $yytable[$p->{yyn}];
        $p->{yyvs}->[++$p->{yyvsp}] = $p->{yylval};
        next yyloop;
      }
      else
      {
        warn("yydebug: error recovery discarding state ".
              $p->{yyss}->[$p->{yyssp}]. "\n") 
                if $p->{yydebug};
        return(undef) if $p->{yyssp} <= 0;
        --$p->{yyssp};
        --$p->{yyvsp};
      }
    }
  }
  else
  {
    return (undef) if $p->{yychar} == 0;
    if ($p->{yydebug})
    {
      $p->{yys} = '';
      if ($p->{yychar} <= $YYMAXTOKEN) { $p->{yys} = 
        $yyname[$p->{yychar}]; }
      if (!$p->{yys}) { $p->{yys} = 'illegal-symbol'; }
      warn("yydebug: state " . $p->{yystate} . 
                   ", error recovery discards " . 
                   "token " . $p->{yychar} . "(" . 
                   $p->{yys} . ")\n");
    }
    $p->{yychar} = -1;
    next yyloop;
  }
0;
} # yy_err_recover

sub yyparse {
  my  $p;
  my $s;
  ($p, $s) = @_;
  if ($p->{yys} = $ENV{'YYDEBUG'})
  {
    $p->{yydebug} = int($1) if $p->{yys} =~ /^(\d)/;
  }

  $p->{yynerrs} = 0;
  $p->{yyerrflag} = 0;
  $p->{yychar} = (-1);

  $p->{yyssp} = 0;
  $p->{yyvsp} = 0;
  $p->{yyss}->[$p->{yyssp}] = $p->{yystate} = 0;

yyloop: while(1)
  {
    yyreduce: {
      last yyreduce if ($p->{yyn} = $yydefred[$p->{yystate}]);
      if ($p->{yychar} < 0)
      {
        if ((($p->{yychar}, $p->{yylval}) = 
            &{$p->{yylex}}($s)) < 0) { $p->{yychar} = 0; }
        if ($p->{yydebug})
        {
          $p->{yys} = '';
          if ($p->{yychar} <= $#yyname) 
             { $p->{yys} = $yyname[$p->{yychar}]; }
          if (!$p->{yys}) { $p->{yys} = 'illegal-symbol'; };
          warn("yydebug: state " . $p->{yystate} . 
                       ", reading " . $p->{yychar} . " (" . 
                       $p->{yys} . ")\n");
        }
      }
      if (($p->{yyn} = $yysindex[$p->{yystate}]) && 
          ($p->{yyn} += $p->{yychar}) >= 0 && 
          $p->{yyn} <= $#yycheck &&
          $yycheck[$p->{yyn}] == $p->{yychar})
      {
        warn("yydebug: state " . $p->{yystate} . 
                     ", shifting to state " .
              $yytable[$p->{yyn}] . "\n") if $p->{yydebug};
        $p->{yyss}->[++$p->{yyssp}] = $p->{yystate} = 
          $yytable[$p->{yyn}];
        $p->{yyvs}->[++$p->{yyvsp}] = $p->{yylval};
        $p->{yychar} = (-1);
        --$p->{yyerrflag} if $p->{yyerrflag} > 0;
        next yyloop;
      }
      if (($p->{yyn} = $yyrindex[$p->{yystate}]) && 
          ($p->{yyn} += $p->{'yychar'}) >= 0 &&
          $p->{yyn} <= $#yycheck &&
          $yycheck[$p->{yyn}] == $p->{yychar})
      {
        $p->{yyn} = $yytable[$p->{yyn}];
        last yyreduce;
      }
      if (! $p->{yyerrflag}) {
        &{$p->{yyerror}}('syntax error', $s);
        ++$p->{yynerrs};
      }
      return(undef) if $p->yy_err_recover;
    } # yyreduce
    warn("yydebug: state " . $p->{yystate} . 
                 ", reducing by rule " . 
                 $p->{yyn} . " (" . $yyrule[$p->{yyn}] . 
                 ")\n") if $p->{yydebug};
    $p->{yym} = $yylen[$p->{yyn}];
    $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}+1-$p->{yym}];
if ($p->{yyn} == 1) {
{ $p->{yyval} = newvar($p->{yyvs}->[$p->{yyvsp}-0]); push(@OUT, "my ".$p->{yyval}." = \$CFG->{SLICE}->{SET}->{OBJ}->{'".$p->{yyvs}->[$p->{yyvsp}-0]."'}->Clone;"); }
}
if ($p->{yyn} == 2) {
{ $p->{yyval} = newvar($p->{yyvs}->[$p->{yyvsp}-1]); push(@OUT, "my ".$p->{yyval}." = \$CFG->{SLICE}->{SET}->{OBJ}->{'NOV_".$p->{yyvs}->[$p->{yyvsp}-1]."'}->Clone;"); }
}
if ($p->{yyn} == 3) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-0]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-0]."->Complement(".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 4) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-0]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-0]."->Complement(".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 5) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->ExclusiveOr(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 6) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->ExclusiveOr(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 7) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->Difference(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 8) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->Difference(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 9) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->Intersection(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 10) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->Intersection(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 11) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->Union(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 12) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-2]; push(@OUT, $p->{yyvs}->[$p->{yyvsp}-2]."->Union(".$p->{yyvs}->[$p->{yyvsp}-2].",".$p->{yyvs}->[$p->{yyvsp}-0].");"); }
}
if ($p->{yyn} == 13) {
{ $p->{yyval} = $p->{yyvs}->[$p->{yyvsp}-1]; }
}
    $p->{yyssp} -= $p->{yym};
    $p->{yystate} = $p->{yyss}->[$p->{yyssp}];
    $p->{yyvsp} -= $p->{yym};
    $p->{yym} = $yylhs[$p->{yyn}];
    if ($p->{yystate} == 0 && $p->{yym} == 0)
    {
      warn("yydebug: after reduction, shifting from state 0 ",
            "to state $YYFINAL\n") if $p->{yydebug};
      $p->{yystate} = $YYFINAL;
      $p->{yyss}->[++$p->{yyssp}] = $YYFINAL;
      $p->{yyvs}->[++$p->{yyvsp}] = $p->{yyval};
      if ($p->{yychar} < 0)
      {
        if ((($p->{yychar}, $p->{yylval}) = 
            &{$p->{yylex}}($s)) < 0) { $p->{yychar} = 0; }
        if ($p->{yydebug})
        {
          $p->{yys} = '';
          if ($p->{yychar} <= $#yyname) 
            { $p->{yys} = $yyname[$p->{yychar}]; }
          if (!$p->{yys}) { $p->{yys} = 'illegal-symbol'; }
          warn("yydebug: state $YYFINAL, reading " . 
               $p->{yychar} . " (" . $p->{yys} . ")\n");
        }
      }
      return ($p->{yyvs}->[1]) if $p->{yychar} == 0;
      next yyloop;
    }
    if (($p->{yyn} = $yygindex[$p->{yym}]) && 
        ($p->{yyn} += $p->{yystate}) >= 0 && 
        $p->{yyn} <= $#yycheck && 
        $yycheck[$p->{yyn}] == $p->{yystate})
    {
        $p->{yystate} = $yytable[$p->{yyn}];
    } else {
        $p->{yystate} = $yydgoto[$p->{yym}];
    }
    warn("yydebug: after reduction, shifting from state " . 
        $p->{yyss}->[$p->{yyssp}] . " to state " . 
        $p->{yystate} . "\n") if $p->{yydebug};
    $p->{yyss}[++$p->{yyssp}] = $p->{yystate};
    $p->{yyvs}[++$p->{yyvsp}] = $p->{yyval};
  } # yyloop
} # yyparse

#   create new set variable
$tmpcnt = 0;
sub newvar {
    my ($name) = @_;
    my ($tmp);

    if ($main::CFG->{SLICE}->{SET}->{OBJ}->{"$name"} eq '') {
        main::printwarning("no such slice '$name'\n") if $undef;
        #    The $undef string is caught by caller, it is used
        #    to trap warnings depending on the -y command line flag.
        die $undef."\n" if $undef > 1;
        $main::CFG->{SLICE}->{SET}->{OBJ}->{"$name"} =
                $main::CFG->{SLICE}->{SET}->{OBJ}->{DEF0}->Clone;
    }
    $tmp = sprintf("\$T%03d", $tmpcnt++);
    return $tmp;
}

#   the lexical scanner
sub yylex {
    local (*s) = @_;
    my ($c, $val);

    #   ignore whitespaces
    $s =~ s|^\s+||;

    #   recognize end of string
    return 0 if ($s eq '');

    #   found a token
    if ($s =~ s|^([_A-Z0-9*{}]+)||) {
        $val = $1;

        #   if its a wildcarded slice name we have
        #   to construct the slice union on-the-fly
        if ($val =~ m|\*|) {
            my $pat = $val;
            $pat =~ s|\*|\.\*|g;

            #   treat special *{...} sequence
            $excl = '';
            while ($pat =~ s|^(.*?)\.\*\{([_A-Z0-9]+)\}(.*)$|$1\.\*$3|) {
                my $temp = $1 . $2 . $3;
                $temp =~ s|\.\*\{[_A-Z0-9]+\}|\.\*|g;
                $excl .= "return 1 if m/^$temp\$/;";
            }
            $sub_excl = eval "sub { \$_ = shift; $excl; return 0}";

            my $slice;
            my @slices = ();
            foreach $slice (keys(%{$main::CFG->{SLICE}->{SET}->{ASC}})) {
                if ($slice =~ m|^$pat$|) {
                    push(@slices, $slice) unless &$sub_excl($slice);
                }
            }
            if ($#slices == 0) {
                $val = $slices[0];
            }
            elsif ($#slices > 0) {
                $s = join('u', @slices).')'.$s;
                return ord('(');
            }
            else {
                main::printwarning("no existing slice matches `$val'\n") if $wildcard;
                #    The $wildcard string is caught by caller, it is used
                #    to trap warnings depending on the -y command line flag.
                die $wildcard."\n" if $wildcard > 1;
            }
        }
        return ($SLICE, $val);
    }

    #   else give back one plain character
    $c = substr($s, 0, 1);
    $s = substr($s, 1);
    return ord($c);
}

#   and error function
sub yyerror {
    my ($msg, $s) = @_;
    die "$msg at $s.\n";
}

#
#  The top-level function which gets called by the user
#
#  ($cmds, $var) = SliceTerm::Parse($term, $status);
#

package SliceTerm;

sub Parse {
    local($str, $status) = @_;
    my($p, $var, $cmds);

    @SliceTermParser::OUT = ();
    $SliceTermParser::undef = $status->{u};
    $SliceTermParser::wildcard = $status->{w};
    $p = SliceTermParser->new(\&SliceTermParser::yylex, \&SliceTermParser::yyerror, 0);
    eval {$var = $p->yyparse(*str);};
    if ($@ =~ s/^(\d)$//) {
        main::error("Execution stopped\n") if $1 > 2;
        return ();
    }
    $cmds = join("\n", @SliceTermParser::OUT) . "\n";

    return ($cmds, $var);
}

package main;

##EOF##
##
##  slice_setup.pl -- Command line parsing and CFG setup
##  Copyright (c) 1997-2002 Ralf S. Engelschall. 
##  Copyright (c) 1999-2002 Denis Barbier.
##

package main;

sub usage {
    print STDERR "Usage: slice [options] [file]\n";
    print STDERR "\n";
    print STDERR "Options:\n";
    print STDERR "  -o, --outputfile=FILESPEC  create output file(s)\n";
    print STDERR "  -y, --output-policy=STRING set default output policy\n";
    print STDERR "  -v, --verbose              enable verbose mode\n";
    print STDERR "  -V, --version              display version string\n";
    print STDERR "  -h, --help                 display usage page\n";
    print STDERR "\n";
    print STDERR "FILESPEC format:\n";
    print STDERR "\n";
    print STDERR "  [SLICETERM:]PATH[\@CHMODOPT]\n";
    print STDERR "\n";
    print STDERR "  SLICETERM ..... a set-theory term describing the slices\n";
    print STDERR "  PATH .......... a filesystem path to the outputfile\n";
    print STDERR "  CHMODOPT ...... permission change options for 'chmod'\n";
    print STDERR "\n";
    exit(1);
}

sub hello {
    print STDERR "$slice_version->{v_tex}\n";
    print STDERR <<'EOT';
Copyright (c) 1997-2002 Ralf S. Engelschall. 
Copyright (c) 1999-2002 Denis Barbier.

This program 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.
EOT
    exit(0);
}

sub setup {
    my ($CFG) = @_;

    #   parse command line options
    $opt_h = 0;
    $opt_V = 0;
    $opt_v = 0;
    $opt_y = '';
    @opt_o = ();
    my (@options_list) = (
        "v|verbose",
        "V|version",
        "h|help",
        "o|outputfile=s@",
        "y|output-policy=s",
    );
    $SIG{'__WARN__'} = sub { 
        print STDERR "Slice:Error: $_[0]";
    };

    $Getopt::Long::bundling = 1;
    $Getopt::Long::getopt_compat = 0;
    if (not Getopt::Long::GetOptions(@options_list)) {
        print STDERR "Try `$0 --help' for more information.\n";
        exit(0);
    }
    $SIG{'__WARN__'} = undef;
    usage($0) if ($opt_h);
    hello() if ($opt_V);

    #   process command line arguments and
    #   read input file
    if (($#ARGV == 0 and $ARGV[0] eq '-') or $#ARGV == -1) {
        $fp = new IO::Handle;
        $fp->fdopen(fileno(STDIN), "r")
            || error("Unable to load STDIN: $!\n");
        local ($/) = undef;
        $INPUT = <$fp>;
        $fp->close()
            || error("Unable to close STDIN: $!\n");
    }
    elsif ($#ARGV == 0) {
        $fp = new IO::File;
        $fp->open($ARGV[0])
            || error("Unable to load $ARGV[0]: $!\n");
        local ($/) = undef;
        $INPUT = <$fp>;
        $fp->close()
            || error("Unable to close $ARGV[0]: $!\n");
    }
    else {
        usage();
    }

    #   add additional options
    $INPUT =~ s|^%!slice\s+(.*?)\n|push(@ARGV, split(' ', $1)), ''|egim;
    if (not Getopt::Long::GetOptions(@options_list)) {
        usage();
    }
    if ($#opt_o == -1) {
        @opt_o = ( "ALL:-" ); # default is all on stdout
    }

    #   setup the $CFG hash
    $CFG->{INPUT} = {};
    $CFG->{INPUT}->{SRC}   = $INPUT;  # original source
    $CFG->{INPUT}->{PLAIN} = '';      # source without slice delimiters
    $CFG->{OPT} = {};    
    $CFG->{OPT}->{X} = $opt_v;        # option -v
    $CFG->{OPT}->{O} = [ @opt_o ];    # options -o
    $CFG->{OPT}->{Y} = {
        'u' => 0, 'w' => 0,
        'z' => 0, 's' => 0,
    };
    $modifier = $opt_y;
    foreach (qw(u w z s)) {
        ($modifier =~ m/$_(\d+)/) and $CFG->{OPT}->{Y}->{$_} = $1;
    }
    $CFG->{SLICE} = {};
    $CFG->{SLICE}->{SET} = {};       
    $CFG->{SLICE}->{SET}->{ASC} = {}; # slice set, represented in ASCII
    $CFG->{SLICE}->{SET}->{OBJ} = {}; # slice set, represented as Bit::Vector object
    $CFG->{SLICE}->{MINLEVELS}  = {}; # slice min levels
    $CFG->{SLICE}->{MAXLEVEL}   = 0;  # maximum slice level
}

##EOF##
##
##  slice_pass1.pl -- Pass 1
##  Copyright (c) 1997-2002 Ralf S. Engelschall.
##  Copyright (c) 1999-2002 Denis Barbier.
##

package main;

##
##
##  Pass 1: Determine delimiters
##
##

sub pass1 {
    my ($CFG) = @_;

    my (@CURRENT_SLICE_NAMES, %CURRENT_LEVEL_BRAIN, $CURRENT_LEVEL_SET);
    my ($INPUT, $prolog, $pos, $inputpos, $prev, $name, $namex, $L, $open);

    verbose("\nPass 1: Determine delimiters\n\n");

    @CURRENT_SLICE_NAMES = ();
    %CURRENT_LEVEL_BRAIN = ();
    $CURRENT_LEVEL_SET   = new Bit::Vector(512);

    #   allocate the next free level starting from 1
    sub alloclevel {
        my ($i);

        for ($i = 0; $i <= $CURRENT_LEVEL_SET->Max(); $i++) {
            last if (not $CURRENT_LEVEL_SET->bit_test($i));
        }
        $CURRENT_LEVEL_SET->Bit_On($i);
        return $i + 1;
    }

    #   clear the given level
    sub clearlevel {
        my ($i) = @_;

        $CURRENT_LEVEL_SET->Bit_Off($i - 1);
    }

    $INPUT = $CFG->{INPUT}->{SRC};
    $open  = 0;
    $pos   = 0;
    $prev  = 0;
    while ($INPUT =~ m/
             (?=[\[:])                 #  Consider only sequences beginning
                                       #  with `[' or `:'
             (?:\[([A-Z][_A-Z0-9]*):   #  Begin delimiter
                      |
             :([A-Z][_A-Z0-9]*)?\])    #  End delimiter
                      /gx) {
        if (defined ($1)) {
            #
            #   begin delimiter found
            #
            $name     = $1;
            $inputpos = pos($INPUT);
            $prolog   = substr ($INPUT, $prev, $inputpos - $prev - length ($name) - 2);

            #   add prolog
            $CFG->{INPUT}->{PLAIN} .= $prolog;

            #   and store position of next character in input datas
            $pos  += length($prolog);
            $prev  = $inputpos;

            $L = alloclevel();                 # allocate next free level

            push(@CURRENT_SLICE_NAMES, $name);  # remember name  for end delimiter
            $CURRENT_LEVEL_BRAIN{"$name"} .= ":$L";# remember level for end delimiter
            if ($CFG->{SLICE}->{MINLEVELS}->{"$name"} eq '' or
                $CFG->{SLICE}->{MINLEVELS}->{"$name"} > $L) {
                $CFG->{SLICE}->{MINLEVELS}->{"$name"} = $L;
            }

            #  now begin entry with LEVEL:START
            $CFG->{SLICE}->{SET}->{ASC}->{"$name:$L"} .=
                 ($CFG->{SLICE}->{SET}->{ASC}->{"$name:$L"} ? ',' : '') . "$L:$pos";

            #  adjust notice about highest level
            $CFG->{SLICE}->{MAXLEVEL} = ($CFG->{SLICE}->{MAXLEVEL} < $L ?
                                         $L : $CFG->{SLICE}->{MAXLEVEL});

            verbose("    slice `$name': begin at $pos, level $L\n");

            $open++;
        }
        elsif ($open > 0) {
            #
            #   end delimiter found
            #
            $name     = $2;
            $inputpos = pos($INPUT);
            $prolog   = substr ($INPUT, $prev, $inputpos - $prev - length ($name) - 2);

            #   add prolog
            $CFG->{INPUT}->{PLAIN} .= $prolog;

            #   and store position of next character in input datas
            $pos  += length($prolog) - 1;
            $prev  = $inputpos;

            $namex = pop(@CURRENT_SLICE_NAMES);      # take remembered name
            $name  = $namex if ($name eq '');        # fill name because of shortcut syntax
            $CURRENT_LEVEL_BRAIN{"$name"} =~ s|:(\d+)$||; # take remembered level
            $L = $1;

            clearlevel($L);                         # de-allocate level

            # now end entry with :END
            $CFG->{SLICE}->{SET}->{ASC}->{"$name:$L"} .= ":$pos";

            verbose("    slice `$name': end at $pos, level $L\n");

            $pos++;
            $open--;
        }
    }
    # add all remaining input
    $CFG->{INPUT}->{PLAIN} .= substr ($INPUT, $prev);

    #   check: were all opened slices really closed?
    if ($CURRENT_LEVEL_SET->Norm > 0) {
        my $i;
        my $err = '';
        for ($i = 0; $i <= $CURRENT_LEVEL_SET->Max(); $i++) {
            if ($CURRENT_LEVEL_SET->bit_test($i)) {
                my $name;
                foreach $name (keys(%CURRENT_LEVEL_BRAIN)) {
                    if ($CURRENT_LEVEL_BRAIN{$name} == ($i+1)) {
                        $err .= " `$name'";
                    }
                }
            }
        }
        error("Some slices were not closed:$err\n");
    }
}

##EOF##
##
##  slice_pass2.pl -- Pass 2
##  Copyright (c) 1997-2002 Ralf S. Engelschall. 
##  Copyright (c) 1999-2002 Denis Barbier.
##

package main;

##
##
##  Pass 2: Calculation of slice sets
##
##

sub pass2 {
    my ($CFG) = @_;

    my ($n, $asc, $slice, $set, $setA);

    verbose("\nPass 2: Calculation of slice sets\n\n");

    #  convert ASCII set representation string into internal set object
    sub asc2set {
        my ($asc, $set, $onlylevel, $notcleared) = @_;
        my ($i, $I, $internal, $from, $to, $level);

        $set->Empty() if (($notcleared eq '') or (not $notcleared));
        return $set if ($asc =~ m|^\d+:0:-1$|); # string represents the empty set

        #   split out the interval substrings 
        @I = ($asc);
        @I = split(',', $asc) if (index($asc, ',') > 0);

        #   iterate over each interval and
        #   set the corresponding elements in the set
        foreach $interval (@I) {
            ($level, $from, $to) = ($interval =~ m|^(\d+):(\d+):(\d+)$|);
            next if (($onlylevel ne '') and ($level != $onlylevel)); 
            next if ($from > $to);
            $set->Interval_Fill($from, $to);
        }
    }

    $n = length($CFG->{INPUT}->{PLAIN})+1;
    $set  = new Bit::Vector($n); # working set
    $setA = new Bit::Vector($n); # "all" set

    #   restore slice names
    foreach $slice (keys(%{$CFG->{SLICE}->{SET}->{ASC}})) {
        $asc = $CFG->{SLICE}->{SET}->{ASC}->{$slice};
        delete $CFG->{SLICE}->{SET}->{ASC}->{$slice};
        $slice =~ s|:\d+$||g;
        $CFG->{SLICE}->{SET}->{ASC}->{$slice} .=
                 ($CFG->{SLICE}->{SET}->{ASC}->{"$slice"} ? ',' : '') . $asc;
    }

    #   convert ASCII representation to real internal set objects
    foreach $slice (keys(%{$CFG->{SLICE}->{SET}->{ASC}})) {
        $asc = $CFG->{SLICE}->{SET}->{ASC}->{$slice};
        $set->Empty();
        asc2set($asc, $set);
        $CFG->{SLICE}->{SET}->{OBJ}->{$slice} = $set->Clone();
    }

    #   define the various (un)defined slice areas
    $set->Fill();
    $CFG->{SLICE}->{SET}->{OBJ}->{'UNDEF0'} = $set->Clone();
    $set->Empty();
    $CFG->{SLICE}->{SET}->{OBJ}->{'DEF0'} = $set->Clone();
    $setA->Empty();
    for ($i = 1; $i <= $CFG->{SLICE}->{MAXLEVEL}; $i++) {
        $set->Empty();
        foreach $slice (keys(%{$CFG->{SLICE}->{SET}->{ASC}})) {
            $asc = $CFG->{SLICE}->{SET}->{ASC}->{$slice};
            asc2set($asc, $set, $i, 1); # load $set with entries of level $i
            $setA->Union($setA, $set);   # add to $setA these entries
        }
        $CFG->{SLICE}->{SET}->{OBJ}->{"DEF$i"} = $set->Clone();
        $set->Complement($set);
        $CFG->{SLICE}->{SET}->{OBJ}->{"UNDEF$i"} = $set->Clone();
    }
    $CFG->{SLICE}->{SET}->{OBJ}->{'DEF'} = $setA->Clone();
    $setA->Complement($setA);
    $CFG->{SLICE}->{SET}->{OBJ}->{'UNDEF'} = $setA->Clone();
    $CFG->{SLICE}->{SET}->{OBJ}->{'ALL'} = $CFG->{SLICE}->{SET}->{OBJ}->{'UNDEF0'};

    #   define the various slice areas which are not overwritten
    foreach $slice (keys(%{$CFG->{SLICE}->{SET}->{ASC}})) {
        $asc = $CFG->{SLICE}->{SET}->{ASC}->{$slice};
        $set->Empty();
        asc2set($asc, $set);
        $L = $CFG->{SLICE}->{MINLEVELS}->{$slice};
        for ($i = $L+1; $i <= $CFG->{SLICE}->{MAXLEVEL}; $i++) {
            $set->Difference($set, $CFG->{SLICE}->{SET}->{OBJ}->{"DEF$i"});
        }
        $CFG->{SLICE}->{SET}->{OBJ}->{"NOV_$slice"} = $set->Clone();
    }

    if ($CFG->{OPT}->{X}) {
        foreach $slice (sort(keys(%{$CFG->{SLICE}->{SET}->{OBJ}}))) {
            $set = $CFG->{SLICE}->{SET}->{OBJ}->{$slice};
            if ($set->Norm > 0) {
                verbose("    slice `$slice': " . $set->to_ASCII() . "\n");
            }
            else {
                verbose("    slice `$slice': -Empty-\n");
            }
        }
    }
}

##EOF##
##
##  slice_pass3.pl -- Pass 3
##  Copyright (c) 1997-2002 Ralf S. Engelschall. 
##  Copyright (c) 1999-2002 Denis Barbier.
##

package main;

##
##
##  Pass 3: Output generation
##
##

sub pass3 {
    my ($CFG) = @_;

    my ($slice, $outfile, $chmod, $status, $modifier, $out);
    my ($set, $cmds, $var);
    my ($start, $min, $max);
    my ($entry);

    verbose("\nPass 3: Output generation\n\n");

    foreach $entry (@{$CFG->{OPT}->{O}}) {

        #   determine skip options:
        #     u: a set is undefined
        #     w: a wildcard set does not match
        #     z: result is empty
        #     s: result is only composed of whitespaces
        $status = $CFG->{OPT}->{Y};
        if ($entry =~ s|\#([suwz\d]+)$||) {
            $modifier = $1;
            foreach (qw(u w z s)) {
                ($modifier =~ m/$_(\d+)/) and $status->{$_} = $1;
            }
        }
        if ($entry =~ m|^([_A-Z0-9~!+u%n\-\\^x*{}()@]+):(.+)@(.+)$|) {
            # full syntax
            ($slice, $outfile, $chmod) = ($1, $2, $3);
        }
        elsif ($entry =~ m|^([_A-Z0-9~!+u%n\-\\^x*{}()@]+):(.+)$|) {
            # only slice and file
            ($slice, $outfile, $chmod) = ($1, $2, '');
        }
        elsif ($entry =~ m|^([^@]+)@(.+)$|) {
            # only file and chmod
            ($slice, $outfile, $chmod) = ('ALL', $1, $2);
        }
        else {
            # only file 
            ($slice, $outfile, $chmod) = ('ALL', $entry, '');
        }
        verbose("    file `$outfile': sliceterm='$slice', chmodopts='$chmod'\n");
        #   parse the sliceterm and create corresponding
        #   Perl 5 statement containing Bit::Vector calls
        ($cmds, $var) = SliceTerm::Parse($slice, $status);
    
        #   skip file if requested by options
        if ($status->{u} > 0 and !defined($cmds)) {
                printwarning("Undefined set: skip generation of $outfile\n");
                next if $status->{u} > 1;
        }

        #   just debugging...
        if ($CFG->{OPT}->{X}) {
            verbose("        calculated Perl 5 set term:\n");
            verbose("        ----\n");
            my $x = $cmds; 
            $x =~ s|\n+$||;
            $x =~ s|\n|\n        |g;
            verbose("        $x\n");
            verbose("        ----\n");
        }

        #   now evaluate the Bit::Vector statements
        #   and move result to $set
        eval "$cmds; \$set = $var";
 
        #   now scan the set and write out characters
        #   which have a corresponding bit set.
        $start = 0;
        $out = '';
        while (($start < $set->Size()) &&
               (($min, $max) = $set->Interval_Scan_inc($start))) {
            $out .= substr($CFG->{INPUT}->{PLAIN},
                               $min, ($max-$min+1));
            $start = $max + 2;
        }

        #   skip file if requested by options
        if ($status->{z} > 0 and $out eq '') {
                printwarning("Empty output: skip generation of $outfile\n");
                main::error("Execution stopped\n") if $status->{z} > 2;
                next if $status->{z} == 2;
        }
        if ($status->{s} > 0 and ($out eq '' or $out !~ m/\S/)) {
                printwarning("Whitespace only: skip generation of $outfile\n");
                main::error("Execution stopped\n") if $status->{s} > 2;
                next if $status->{s} == 2;
        }

        #   open output file
        if ($outfile eq '-') {
            print $out;
        }
        else {
            open(OUT, ">$outfile")
                or main::error("Unable to write into $outfile: $!\n");
            print OUT $out
                or main::fileerror($outfile, "Unable to write into $outfile: $!\n");
            close(OUT)
                or main::fileerror($outfile, "Unable to close $outfile: $!\n");
        }

        #   additionally run chmod on the output file
        if ($outfile ne '-' and $chmod ne '' and -f $outfile) {
            system("chmod $chmod $outfile");
        }
    }
}


$CFG = {};
setup($CFG);
pass1($CFG);
pass2($CFG);
pass3($CFG);

exit(0);


##EOF##
