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#!/usr/bin/perl
# Simple ifdef/else/endif processor.
die "usage: ifdef [-C<command-prefix>] [-Dname ...] [control-file ...] " if (@ARGV[0] =~ /^(-h|--help)$/);
%Parms = ();
$pre = "!";
while ($arg=shift(@ARGV)) {
if ($arg =~ /^-/) {
if ($arg =~ /^-D(\w+)$/) {
$Parms{$1} = 1;
} elsif ($arg =~ /-C(.*)$/) {
$pre = $1;
} else {
die "unrecognized option: $arg";
}
} else {
open(CONTROL, "< $arg") or die "cannot open $arg";
while (<CONTROL>) {
if (/^!define\s+(\w+)/) {
$Parms{$1} = 1;
}
}
}
}
sub ifdef {
my ($var, $enabled) = @_;
my $def = 0;
$def = 1 if (defined $Parms{$var}) || ($var eq "true");
$def = 0 if $var eq "false";
while (<STDIN>) {
if (/^\s*\Q$pre\Eifdef\s+(\w+)\s*$/) {
return 1 if ifdef ($1, $def & $enabled);
} elsif (/^\s*\Q$pre\Eelseif\s+(\w+)\s*$/) {
$def = $def ^ 1;
return ifdef ($1, $def & $enabled);
} elsif (/^\s*\Q$pre\Eelse\s*$/) {
$def = $def ^ 1;
} elsif (/^\s*\Q$pre\Eendif\s*$/) {
return 0;
} elsif (/^\s*\Q$pre\E/) {
die "unrecognized command: $_";
} else {
print if $def && $enabled;
}
}
return 1;
}
ifdef("true", 1);
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