06-23-2012
Remove "#" from #EOF and # EOF.
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LEARN ABOUT DEBIAN
filter::eof
Filter::EOF(3pm) User Contributed Perl Documentation Filter::EOF(3pm)
NAME
Filter::EOF - Run a callback after a file has been compiled
VERSION
0.04
SYNOPSIS
package MyPackage;
use warnings;
use strict;
use Filter::EOF;
sub import {
my ($class, @args) = @_;
my $caller = scalar caller;
# set the COMPILE_TIME package var to a false value
# when the file was compiled
Filter::EOF->on_eof_call(sub {
no strict 'refs';
${ $caller . '::COMPILE_TIME' } = 0;
});
# set the COMPILE_TIME package var to a true value when
# we start compiling it.
{ no strict 'refs';
${ $caller . '::COMPILE_TIME' } = 1;
}
}
1;
...
package MyUsingPackage;
use warnings;
use strict;
our $COMPILE_TIME;
use MyPackage;
# prints 'yes'
BEGIN { print +( $COMPILE_TIME ? 'yes' : 'no' ), "
" }
# prints 'no'
print +( $COMPILE_TIME ? 'yes' : 'no' ), "
";
1;
DESCRIPTION
This module utilises Perl's source filters to provide you with a mechanism to run some code after a file using your module has been pro-
cessed.
METHODS
"import( @functions )"
Currently, only a function equivalent of the "on_eof_call" method is provided for export.
use Filter::EOF qw( on_eof_call );
sub import {
my ($class) = @_;
...
on_eof_call { ... };
}
...
"on_eof_call( $code_ref )"
Call this method in your own "import" method to register a code reference that should be called when the file "use"ing yours was compiled.
The code reference will get a scalar reference as first argument to an empty string. if you change this string to something else, it will
be appended at the end of the source.
# call C<some_function()> after runtime.
Filter->on_eof_call(sub {
my $append = shift;
$$append .= '; some_function(); 1;';
});
EXPORTS
on_eof_call
You can optionally import the "on_eof_call" function into your namespace.
EXAMPLES
You can find the example mentioned in "SYNOPSIS" in the distribution directory "examples/synopsis/".
SEE ALSO
Filter::Call::Util, "Exporting without using Exporter's import method" in Exporter
AUTHOR AND COPYRIGHT
Robert 'phaylon' Sedlacek - "<rs@474.at>". Many thanks to Matt S Trout for the idea and inspirations on this module.
LICENSE
This program is free software; you can redistribute it and/or modify it under the same terms as perl itself.
perl v5.8.8 2008-03-08 Filter::EOF(3pm)