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# How to generate the logic of the lookup table Perl_keyword() in toke.c |
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use Devel::Tokenizer::C 0.05; |
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use strict; |
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use warnings; |
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my @pos = qw(__DATA__ __END__ AUTOLOAD BEGIN CHECK DESTROY do delete defined |
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END else eval elsif exists for format foreach grep goto glob INIT |
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if last local m my map next no our pos print printf package |
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prototype q qr qq qw qx redo return require s scalar sort split |
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study sub tr tie tied use undef until untie unless while y); |
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# In 5.8.x there is no err |
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my @neg = qw(__FILE__ __LINE__ __PACKAGE__ and abs alarm atan2 accept bless |
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bind binmode CORE cmp chr cos chop close chdir chomp chmod chown |
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crypt chroot caller connect closedir continue die dump dbmopen |
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dbmclose eq eof exp exit exec each endgrent endpwent |
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endnetent endhostent endservent endprotoent fork fcntl flock |
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fileno formline getppid getpgrp getpwent getpwnam getpwuid |
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getpeername getprotoent getpriority getprotobyname |
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getprotobynumber gethostbyname gethostbyaddr gethostent |
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getnetbyname getnetbyaddr getnetent getservbyname getservbyport |
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getservent getsockname getsockopt getgrent getgrnam getgrgid |
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getlogin getc gt ge gmtime hex int index ioctl join keys kill lt |
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le lc log link lock lstat length listen lcfirst localtime mkdir |
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msgctl msgget msgrcv msgsnd ne not or ord oct open opendir pop |
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push pack pipe quotemeta ref read rand recv rmdir reset rename |
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rindex reverse readdir readlink readline readpipe rewinddir seek |
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send semop select semctl semget setpgrp seekdir setpwent setgrent |
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setnetent setsockopt sethostent setservent setpriority |
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setprotoent shift shmctl shmget shmread shmwrite shutdown sin |
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sleep socket socketpair sprintf splice sqrt srand stat substr |
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system symlink syscall sysopen sysread sysseek syswrite tell time |
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times telldir truncate uc utime umask unpack unlink unshift |
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ucfirst values vec warn wait write waitpid wantarray x xor); |
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my %pos = map { ($_ => 1) } @pos; |
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my $t = Devel::Tokenizer::C->new( TokenFunc => \&perl_keyword |
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, TokenString => 'name' |
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, StringLength => 'len' |
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, MergeSwitches => 1 |
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); |
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$t->add_tokens(@pos, @neg, 'elseif'); |
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my $switch = $t->generate(Indent => ' '); |
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print <<END; |
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/* |
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* The following code was generated by $0. |
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*/ |
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I32 |
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Perl_keyword (pTHX_ char *name, I32 len) |
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{ |
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$switch |
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unknown: |
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return 0; |
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} |
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END |
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sub perl_keyword |
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{ |
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my $k = shift; |
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my $sign = $pos{$k} ? '' : '-'; |
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if ($k eq 'elseif') { |
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return <<END; |
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if(ckWARN_d(WARN_SYNTAX)) |
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Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "elseif should be elsif"); |
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END |
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} |
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return <<END; |
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return ${sign}KEY_$k; |
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END |
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} |
