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|
################################################################################
#
# PROGRAM: parser.pl
#
################################################################################
#
# DESCRIPTION: Generate tokenizer code for C parser
#
################################################################################
#
# Copyright (c) 2002-2024 Marcus Holland-Moritz. All rights reserved.
# This program is free software; you can redistribute it and/or modify
# it under the same terms as Perl itself.
#
################################################################################
use Devel::Tokenizer::C;
# keywords that cannot be disabled
@no_disable = qw(
break
case char continue
default do
else
for
goto
if int
return
sizeof struct switch
typedef
union
while
);
# keywords that can be disabled
@disable = qw(
asm auto
const
double
enum extern
float
inline
long
register restrict
short signed static
unsigned
void volatile
);
@basic = qw(
char
double
float
int
long
short signed
unsigned
);
# put them in a hash
@NDIS{@no_disable} = (1) x @no_disable;
$file = shift;
if( $file =~ /parser/ ) {
$t = Devel::Tokenizer::C->new( TokenFunc => \&t_parser )
->add_tokens( @disable, @no_disable );
}
elsif( $file =~ /basic/ ) {
$t = Devel::Tokenizer::C->new( TokenFunc => \&t_basic,
TokenString => 'c',
TokenEnd => '*name',
)
->add_tokens( @basic );
}
elsif( $file =~ /keywords/ ) {
$t = Devel::Tokenizer::C->new( TokenFunc => \&t_keywords, TokenString => 'str' )
->add_tokens( @disable );
}
elsif( $file =~ /ckeytok/ ) {
$t = Devel::Tokenizer::C->new( TokenFunc => \&t_ckeytok, TokenString => 'name' )
->add_tokens( @disable, @no_disable );
}
else { die "invalid file: $file\n" }
open OUT, ">$file" or die "$file: $!";
print OUT $t->generate;
close OUT;
sub t_parser {
my $token = shift;
if( exists $NDIS{$token} ) {
return "return \U$token\E_TOK;\n";
}
else {
return "if( pState->pCPC->keywords & HAS_KEYWORD_\U$token\E )\n"
. " return \U$token\E_TOK;\n";
}
};
sub t_basic {
my $token = shift;
if( $token eq 'long' ) {
return <<END
tflags |= tflags & T_LONG ? T_LONGLONG : T_LONG;
goto success;
END
}
return <<END
tflags |= T_\U$token\E;
goto success;
END
};
sub t_keywords {
my $token = shift;
return "keywords &= ~HAS_KEYWORD_\U$token\E;\n"
."goto success;\n";
};
sub t_ckeytok {
my $token = shift;
return <<END
static const CKeywordToken ckt = { \U$token\E_TOK, "$token" };
return &ckt;
END
};
|
