I'm not sure it is such a good idea to use Moose (or any other object system) for this task, but nothing tried, nothing gained!

In FileReader.pm

package FileReader;
use Moose;
use Moose::Util::TypeConstraints;
use IO::File;

subtype 'FileHandleFromStr', as 'FileHandle';

coerce 'FileHandleFromStr', from 'Str', via { IO::File->new("< $_") };

has file => (
    is     => 'ro',
    isa    => 'FileHandleFromStr',
    coerce => 1,
);

sub read_next_line {
    my $self = shift;
    return $self->file->getline;
}

1

[download]
In your script:
use Modern::Perl qw/2014/;
use lib 'C:/Data/strawberry/script-chrome';
use FileReader;
use Data::Dump qw /dump/;

my $file =
  FileReader->new( file => 'C:/Data/strawberry/script-chrome/test.txt'
+ );
while ( my $line = $file->read_next_line ) {
    print $line;
}

[download]
Moose will take care of opening the file and attaching the filehandle to your object. You then call the method read_next_line on this object to ... read the next line.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

My blog: Imperial Deltronics

In reply to Re: Moose reading big file line by line by CountZero
in thread Moose reading big file line by line by learning.moose

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