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File Name : cpp.pm

package Filter::cpp;
 
use Filter::Util::Exec ;
use Config ;
use strict;
use warnings;

our $VERSION = '1.58' ;

my $cpp;
my $sep;
if ($^O eq 'MSWin32') {
    $cpp = 'cpp.exe' ;
    $sep = ';';
}
else {
    ($cpp) = $Config{cppstdin} =~ /^(\S+)/;
    $sep = ':';
}

if (! $cpp) {
    require Carp;
    Carp::croak ("Cannot find cpp\n");
}

# Check if cpp is installed
if ( ! -x $cpp) {
    my $foundCPP = 0 ;
    foreach my $dir (split($sep, $ENV{PATH}), '')
    {
        if (-x "$dir/$cpp")
        {
            $foundCPP = 1;
            last ;
        }
    }

if (! $foundCPP) {
        require Carp;
        Carp::croak("Cannot find cpp\n");
    }
}

sub import 
{ 
    my($self, @args) = @_ ;

if ($^O eq 'MSWin32') {
        Filter::Util::Exec::filter_add ($self, 'cmd', '/c', 
		"cpp.exe 2>nul") ;
    }
    else {
        Filter::Util::Exec::filter_add ($self, 'sh', '-c', 
		"$Config{'cppstdin'} $Config{'cppminus'} 2>/dev/null") ;
    }
}

1 ;
__END__

=head1 NAME

Filter::cpp - cpp source filter

=head1 SYNOPSIS

use Filter::cpp ;

=head1 DESCRIPTION

This source filter pipes the current source file through the C
pre-processor (cpp) if it is available.

As with all source filters its scope is limited to the current source
file only. Every file you want to be processed by the filter must have a

use Filter::cpp ;

near the top.

Here is an example script which uses the filter:

use Filter::cpp ;

#define FRED 1
    $a = 2 + FRED ;
    print "a = $a\n" ;
    #ifdef FRED
    print "Hello FRED\n" ;
    #else
    print "Where is FRED\n" ;
    #endif

And here is what it will output:

a = 3
    Hello FRED

This example below, provided by Michael G Schwern, shows a clever way
to get Perl to use a C pre-processor macro when the Filter::cpp module
is available, or to use a Perl sub when it is not.

# use Filter::cpp if we can.
    BEGIN { eval 'use Filter::cpp' }

sub PRINT {
        my($string) = shift;

#define PRINT($string) \
        (print $string."\n")
    }
     
    PRINT("Mu");

Look at Michael's Tie::VecArray module for a practical use.

=head1 AUTHOR

Paul Marquess

=head1 DATE

11th December 1995.

=cut

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-28 02:36:05
..	dir	-	root/root	0755	2025-10-08 12:13:28
Util	dir	-	root/root	0755	2024-03-28 02:36:05
cpp.pm	text/plain	2.13 KB	root/root	0644	2017-11-15 09:08:16
decrypt.pm	text/plain	2.93 KB	root/root	0644	2017-11-15 09:08:16
exec.pm	text/plain	1.23 KB	root/root	0644	2017-11-15 09:08:16
sh.pm	text/plain	1.36 KB	root/root	0644	2017-11-15 09:08:16
tee.pm	text/plain	793 B	root/root	0644	2017-11-15 09:08:16

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