/usr/share/perl5/IO/Lines.pm is in libio-stringy-perl 2.110-5.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | package IO::Lines;
=head1 NAME
IO::Lines - IO:: interface for reading/writing an array of lines
=head1 SYNOPSIS
use IO::Lines;
### See IO::ScalarArray for details
=head1 DESCRIPTION
This class implements objects which behave just like FileHandle
(or IO::Handle) objects, except that you may use them to write to
(or read from) an array of lines. They can be tiehandle'd as well.
This is a subclass of L<IO::ScalarArray|IO::ScalarArray>
in which the underlying
array has its data stored in a line-oriented-format: that is,
every element ends in a C<"\n">, with the possible exception of the
final element. This makes C<getline()> I<much> more efficient;
if you plan to do line-oriented reading/printing, you want this class.
The C<print()> method will enforce this rule, so you can print
arbitrary data to the line-array: it will break the data at
newlines appropriately.
See L<IO::ScalarArray> for full usage and warnings.
=cut
use Carp;
use strict;
use IO::ScalarArray;
use vars qw($VERSION @ISA);
# The package version, both in 1.23 style *and* usable by MakeMaker:
$VERSION = "2.110";
# Inheritance:
@ISA = qw(IO::ScalarArray); ### also gets us new_tie :-)
#------------------------------
#
# getline
#
# Instance method, override.
# Return the next line, or undef on end of data.
# Can safely be called in an array context.
# Currently, lines are delimited by "\n".
#
sub getline {
my $self = shift;
if (!defined $/) {
return join( '', $self->_getlines_for_newlines );
}
elsif ($/ eq "\n") {
if (!*$self->{Pos}) { ### full line...
return *$self->{AR}[*$self->{Str}++];
}
else { ### partial line...
my $partial = substr(*$self->{AR}[*$self->{Str}++], *$self->{Pos});
*$self->{Pos} = 0;
return $partial;
}
}
else {
croak 'unsupported $/: must be "\n" or undef';
}
}
#------------------------------
#
# getlines
#
# Instance method, override.
# Return an array comprised of the remaining lines, or () on end of data.
# Must be called in an array context.
# Currently, lines are delimited by "\n".
#
sub getlines {
my $self = shift;
wantarray or croak("can't call getlines in scalar context!");
if ((defined $/) and ($/ eq "\n")) {
return $self->_getlines_for_newlines(@_);
}
else { ### slow but steady
return $self->SUPER::getlines(@_);
}
}
#------------------------------
#
# _getlines_for_newlines
#
# Instance method, private.
# If $/ is newline, do fast getlines.
# This CAN NOT invoke getline!
#
sub _getlines_for_newlines {
my $self = shift;
my ($rArray, $Str, $Pos) = @{*$self}{ qw( AR Str Pos ) };
my @partial = ();
if ($Pos) { ### partial line...
@partial = (substr( $rArray->[ $Str++ ], $Pos ));
*$self->{Pos} = 0;
}
*$self->{Str} = scalar @$rArray; ### about to exhaust @$rArray
return (@partial,
@$rArray[ $Str .. $#$rArray ]); ### remaining full lines...
}
#------------------------------
#
# print ARGS...
#
# Instance method, override.
# Print ARGS to the underlying line array.
#
sub print {
if (defined $\ && $\ ne "\n") {
croak 'unsupported $\: must be "\n" or undef';
}
my $self = shift;
### print STDERR "\n[[ARRAY WAS...\n", @{*$self->{AR}}, "<<EOF>>\n";
my @lines = split /^/, join('', @_); @lines or return 1;
### Did the previous print not end with a newline?
### If so, append first line:
if (@{*$self->{AR}} and (*$self->{AR}[-1] !~ /\n\Z/)) {
*$self->{AR}[-1] .= shift @lines;
}
push @{*$self->{AR}}, @lines; ### add the remainder
### print STDERR "\n[[ARRAY IS NOW...\n", @{*$self->{AR}}, "<<EOF>>\n";
1;
}
#------------------------------
1;
__END__
=head1 VERSION
$Id: Lines.pm,v 1.3 2005/02/10 21:21:53 dfs Exp $
=head1 AUTHORS
=head2 Primary Maintainer
David F. Skoll (F<dfs@roaringpenguin.com>).
=head2 Principal author
Eryq (F<eryq@zeegee.com>).
President, ZeeGee Software Inc (F<http://www.zeegee.com>).
=head2 Other contributors
Thanks to the following individuals for their invaluable contributions
(if I've forgotten or misspelled your name, please email me!):
I<Morris M. Siegel,>
for his $/ patch and the new C<getlines()>.
I<Doug Wilson,>
for the IO::Handle inheritance and automatic tie-ing.
=cut
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