[perl #80628] __SUB__

[perl5.git] / regen / keywords.pl

#!/usr/bin/perl -w
#
# Regenerate (overwriting only if changed):
#
#    keywords.h keywords.c
#
# from information stored in the DATA section of this file.
#
# Accepts the standard regen_lib -q and -v args.

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

require 'regen/regen_lib.pl';

my $h = open_new('keywords.h', '>',
                 { by => 'regen/keywords.pl', from => 'its data',
                   file => 'keywords.h', style => '*',
                   copyright => [1994 .. 1997, 1999 .. 2002, 2005 .. 2007]});
my $c = open_new('keywords.c', '>',
                 { by => 'regen/keywords.pl', from => 'its data', style => '*'});

my %by_strength;

my $keynum = 0;
while (<DATA>) {
    chop;
    next unless $_;
    next if /^#/;
    my ($strength, $keyword) = /^([- +])([A-Z_a-z2]+)/;
    die "Bad line '$_'" unless defined $strength;
    print $h tab(5, "#define KEY_$keyword"), $keynum++, "\n";
    push @{$by_strength{$strength}}, $keyword;
}

# If this hash changes, make sure the equivalent hash in
# dist/B-Deparse/Deparse.pm is also updated.
my %feature_kw = (
        given   => 'switch',
        when    => 'switch',
        default => 'switch',
        # continue is already a keyword
        break   => 'switch',

        say     => 'say',

        state   => 'state',

        evalbytes=>'evalbytes',

        __SUB__ => '__SUB__',
        );

my %pos = map { ($_ => 1) } @{$by_strength{'+'}};

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

$t->add_tokens(@{$by_strength{'+'}}, @{$by_strength{'-'}}, 'elseif');

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

print $c <<"END";
#include "EXTERN.h"
#define PERL_IN_KEYWORDS_C
#include "perl.h"
#include "keywords.h"

I32
Perl_keyword (pTHX_ const char *name, I32 len, bool all_keywords)
{
  dVAR;

  PERL_ARGS_ASSERT_KEYWORD;

$switch
unknown:
  return 0;
}
END

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

  if ($k eq 'elseif') {
    return <<END;
Perl_ck_warner_d(aTHX_ packWARN(WARN_SYNTAX), "elseif should be elsif");
END
  }
  elsif (my $feature = $feature_kw{$k}) {
    $feature =~ s/([\\"])/\\$1/g;
    return <<END;
return (all_keywords || FEATURE_IS_ENABLED("$feature") ? ${sign}KEY_$k : 0);
END
  }
  return <<END;
return ${sign}KEY_$k;
END
}

read_only_bottom_close_and_rename($_, [$0]) foreach $c, $h;


# coresub_op in op.c expects __FILE__, __LINE__ and __PACKAGE__ to be the
# first three.

__END__

 NULL
-__FILE__
-__LINE__
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+__DATA__
+__END__
-__SUB__
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+UNITCHECK
-CORE
+DESTROY
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