# How to generate the logic of the lookup table Perl_keyword() in toke.c

use Devel::Tokenizer::C 0.05;
use strict;
use warnings;

my @pos = qw(__DATA__ __END__ AUTOLOAD BEGIN CHECK DESTROY do delete defined
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# In 5.8.x there is no err
my @neg = qw(__FILE__ __LINE__ __PACKAGE__ and abs alarm atan2 accept bless
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my %pos = map { ($_ => 1) } @pos;

my $t = Devel::Tokenizer::C->new( TokenFunc     => \&perl_keyword
                                , TokenString   => 'name'
                                , StringLength  => 'len'
                                , MergeSwitches => 1
                                );

$t->add_tokens(@pos, @neg, 'elseif');

my $switch = $t->generate(Indent => '  ');

print <<END;
/*
 *  The following code was generated by $0.
 */

I32
Perl_keyword (pTHX_ char *name, I32 len)
{
$switch
unknown:
  return 0;
}
END

sub perl_keyword
{
  my $k = shift;
  my $sign = $pos{$k} ? '' : '-';

  if ($k eq 'elseif') {
    return <<END;
if(ckWARN_d(WARN_SYNTAX))
  Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "elseif should be elsif");
END
  }

  return <<END;
return ${sign}KEY_$k;
END
}