NAME Path::Class::Each - Iterate lines in a file VERSION This document describes Path::Class::Each version 0.03 SYNOPSIS use Path::Class; use Path::Class::Each; ## Files ## # Iterator interface my $iter = file( 'foo', 'bar' )->iterator; while ( defined( my $line = $iter->() ) ) { print "Line: $line\n"; } # 'next' interface my $file = file( 'foo', 'bar' ); while ( defined( my $line = $file->next ) ) { print "Line: $line\n"; } # Callback interface file( 'foo', 'bar' )->each( sub { print "Line: $_\n"; } ); ## Directories ## # Iterator interface my $iter = dir( 'foo', 'bar' )->iterator; while ( defined( my $file = $iter->() ) ) { print "File: $file\n"; } # 'next' interface my $file = dir( 'foo', 'bar' ); while ( defined( my $file = $dir->next_file ) ) { print "File: $file\n"; } # Callback interface dir( 'foo', 'bar' )->each( sub { print "File: $_\n"; } ); DESCRIPTION "Path::Class::Each" augments Path::Class::File and Path::Class::Dir to provide three different ways of iterating over the lines of a file and three ways of iterating the files recursively contained in a directory. "Path::Class::File" provides a "slurp" method that returns the contents of a file (either as a scalar or an array) but has no support for reading a file a line at a time. For large files it may be desirable to iterate through the lines; that's where this module comes in. "Path::Class::Dir" provides "children" which returns the files and directories immediately contained in a directory but does not expose a 'find' interface to recursively search a directory. This module provides iterators that visit all the files in the directory tree below a directory. INTERFACE File Iterators "Path::Class::File->iterator" Get an iterator that returns the lines in a file. Returns "undef" when there are no more lines to return. my $iter = file( 'foo', 'bar' )->iterator; while ( defined( my $line = $iter->() ) ) { print "Line: $line\n"; } If the file can not be opened an exception will be thrown (using "croak"). The following options may be passed as key, value pairs: "chomp" Newlines will be trimmed from each line read. "iomode" Passed as the "mode" argument to "open". See Path::Class::File::open for details. If omitted defaults to 'r' (read-only). Here's how options are passed: my $chomper = file('foo', 'bar')->iterator( chomp => 1 ); "Path::Class::File->next" Return the next line from a file. Returns "undef" when all lines have been read. Internally iterator is called if necessary to create a new iterator. The same options that iterator accepts may be passed to "next": my $file = file( 'foo', 'bar' ); while ( defined( my $line = $file->next( chomp => 1 ) ) ) { print "Line: $line\n"; } NOTE It may be tempting to use an idiom like: # DON'T DO THIS while ( my $line = file('foo')->next ) { ... } That will create a new "Path::Class::File" and, therefore, a new iterator each time it is called with the result that the first line of the file will be returned repeatedly. "Path::Class::File->each" Call a supplied callback for each line in a file. The same options that iterator accepts may be passed: file( 'foo', 'bar' )->each( chomp => 1, sub { print "Line: $_\n" } ); Within the callback the current line will be in $_. Directory Iterators "Path::Class::Dir->iterator" Return an iterator that returns each of the files in and below a directory. By default only files are returned. The following options may be supplied to modify this behaviour: "dirs" Return directories as well as files. "no_files" Return directories only. "Path::Class::Dir->next_file" Return the next file from a recursive search of a directory. Returns "undef" when all lines have been read. Internally iterator is called if necessary to create a new iterator. The same options that iterator accepts may be passed to "next_file": my $dir = dir( 'foo', 'bar' ); while ( defined( my $file = $dir->next_file ) ) { print "File: $file\n"; } "Path::Class::Dir->next_dir" Return the next directory from a recursive search of a directory. "Path::Class::Dir->each" Call a supplied callback for each file in a directory. The same options that iterator accepts may be passed: dir( 'foo', 'bar' )->each( dirs => 1, sub { print "Object: $_\n" } ); Within the callback the current file will be in $_. "Path::Class::Dir->each_dir" Call a supplied callback for each subdirectory in a directory. DEPENDENCIES Path::Class AUTHOR Andy Armstrong "" LICENCE AND COPYRIGHT Copyright (c) 2010, Andy Armstrong "". All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic. 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