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#!/usr/bin/perl
# cpp-perl.pl: trivial preprocessor with just about enough intelligence
# to parse config.h
# Copyright (c) 2004,2008 Philip Kendall, Gergely Szasz
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 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.
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Author contact information:
# Philip Kendall <philip-fuse@shadowmagic.org.uk>
use warnings;
use strict;
use IO::File;
my %defines;
my @conditions;
my $condition;
sub parse_file ($;$) {
my( $filename, $inhibit ) = @_;
$condition = undef;
$inhibit ||= 0;
my $fh = new IO::File( '<' . $filename )
or die "Couldn't open '$filename': $!";
while( <$fh> ) {
if( not defined $condition ) {
$condition = 1;
foreach ( @conditions ) {
$condition = ( $condition and $_ );
}
}
if( /^#\s*define\s+([[:alnum:]_]+)\s+(.*)\s*$/ ) {
$defines{$1} = $2 if $condition;
next;
}
if( /^#\s*undef\s+([[:alnum:]_]+)\s*$/ ) {
delete $defines{$1} if $condition;
next;
}
if( /^#\s*ifdef\s+([[:alnum:]_]+)/ or
/^#\s*if\s+defined\s+([[:alnum:]_]+)/ ) {
push @conditions, defined $defines{$1};
$condition = undef;
next;
}
if( /^#\s*ifndef\s+([[:alnum:]_]+)/ or
/^#\s*if\s+!\s*defined\s+([[:alnum:]_]+)/ ) {
push @conditions, not defined $defines{$1};
$condition = undef;
next;
}
if( /^#\s*else/ ) {
$conditions[-1] = not $conditions[-1];
$condition = undef;
next;
}
if( /^#\s*elif\s+defined\s+([[:alnum:]_]+)/ ) {
$conditions[-1] = $conditions[-1] ? not $conditions[-1] :
defined $defines{$1};
$condition = undef;
next;
}
if( /^#\s*elif\s+!\s*defined\s+([[:alnum:]_]+)/ ) {
$conditions[-1] = $conditions[-1] ? not $conditions[-1] :
not defined $defines{$1};
$condition = undef;
next;
}
if( /^#\s*endif/ ) {
pop @conditions;
$condition = undef;
next;
}
s/^#.*$//;
print if $condition and not $inhibit;
}
}
die "$0: usage: $0 /path/to/config.h /path/to/data/file\n" unless @ARGV == 2;
parse_file( $ARGV[0], 1 );
parse_file( $ARGV[1] );
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