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/usr/share/perl5/App/Ack/Resource.pm is in ack-grep 2.12-1.

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The actual contents of the file can be viewed below.

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package App::Ack::Resource;

use App::Ack;

use warnings;
use strict;
use overload
    '""' => 'name';

sub FAIL {
    require Carp;
    Carp::confess( 'Must be overloaded' );
}

=head1 SYNOPSIS

This is the base class for App::Ack::Resource and any resources
that derive from it.

=head1 METHODS

=head2 new( $filename )

Opens the file specified by I<$filename> and returns a filehandle and
a flag that says whether it could be binary.

If there's a failure, it throws a warning and returns an empty list.

=cut

sub new {
    return FAIL();
}

=head2 $res->name()

Returns the name of the resource.

=cut

sub name {
    return FAIL();
}

=head2 $res->is_binary()

Tells whether the resource is binary.  If it is, and ack finds a
match in the file, then ack will not try to display a match line.

=cut

sub is_binary {
    return FAIL();
}

=head2 $res->open()

Opens a filehandle for reading this resource and returns it, or returns
undef if the operation fails (the error is in C<$!>).  Instead of calling
C<close $fh>, C<$res-E<gt>close> should be called.

=cut

sub open {
    return FAIL();
}

=head2 $res->needs_line_scan( \%opts )

API: Tells if the resource needs a line-by-line scan.  This is a big
optimization because if you can tell from the outset that the pattern
is not found in the resource at all, then there's no need to do the
line-by-line iteration.  If in doubt, return true.

Base: Slurp up an entire file up to 100K, see if there are any
matches in it, and if so, let us know so we can iterate over it
directly.  If it's bigger than 100K or the match is inverted, we
have to do the line-by-line, too.

=cut

sub needs_line_scan {
    return FAIL();
}

=head2 $res->reset()

Resets the resource back to the beginning.  This is only called if
C<needs_line_scan()> is true, but not always if C<needs_line_scan()>
is true.

=cut

sub reset {
    return FAIL();
}

=head2 $res->close()

API: Close the resource.

=cut

sub close {
    return FAIL();
}

=head2 $res->clone

Clones this resource.

=cut

sub clone {
    return FAIL();
}

=head2 $res->firstliney

Returns the first line (or first 250 characters, whichever comes first of a
resource).  Resource subclasses are encouraged to cache this value.

=cut

sub firstliney {
    return FAIL();
}

1;