sub import {
my ($class,@args) = @_;
- croak("`use open' needs explicit list of disciplines") unless @args;
+ croak("`use open' needs explicit list of PerlIO layers") unless @args;
my $std;
$^H |= $open::hint_bits;
my ($in,$out) = split(/\0/,(${^OPEN} || "\0"), -1);
$target =~ s/^(\w+)\(.+\)$/$1/; # strip parameters
unless(PerlIO::Layer::->find($target)) {
- warnings::warnif("layer", "Unknown discipline layer '$layer'");
+ warnings::warnif("layer", "Unknown PerlIO layer '$layer'");
}
}
push(@val,":$layer");
$in = $out = join(' ',@val);
}
else {
- croak "Unknown discipline class '$type'";
+ croak "Unknown PerlIO layer class '$type'";
}
}
${^OPEN} = join("\0",$in,$out) if $in or $out;
=head1 NAME
-open - perl pragma to set default disciplines for input and output
+open - perl pragma to set default PerlIO layers for input and output
=head1 SYNOPSIS
=head1 DESCRIPTION
-Full-fledged support for I/O disciplines is now implemented provided
+Full-fledged support for I/O layers is now implemented provided
Perl is configured to use PerlIO as its IO system (which is now the
default).
The C<open> pragma serves as one of the interfaces to declare default
-"layers" (aka disciplines) for all I/O.
+"layers" for all I/O.
The C<open> pragma is used to declare one or more default layers for
I/O operations. Any open(), readpipe() (aka qx//) and similar
If you have a legacy encoding, you can use the C<:encoding(...)> tag.
-if you want to set your encoding disciplines based on your
+if you want to set your encoding layers based on your
locale environment variables, you can use the C<:locale> tag.
For example:
many encodings have several aliases. See L<Encode::Supported> for
details and the list of supported locales.
-Note that C<:utf8> discipline must always be specified exactly like
+Note that C<:utf8> PerlIO layer must always be specified exactly like
that, it is not subject to the loose matching of encoding names.
When open() is given an explicit list of layers they are appended to
the default encoding of your STDIN, STDOUT, and STDERR, and of
B<any subsequent file open>, is UTF-8.
-Directory handles may also support disciplines in future.
+Directory handles may also support PerlIO layers in the future.
=head1 NONPERLIO FUNCTIONALITY
If Perl is not built to use PerlIO as its IO system then only the two
-pseudo-disciplines C<:bytes> and C<:crlf> are available.
+pseudo-layers C<:bytes> and C<:crlf> are available.
-The C<:bytes> discipline corresponds to "binary mode" and the C<:crlf>
-discipline corresponds to "text mode" on platforms that distinguish
+The C<:bytes> layer corresponds to "binary mode" and the C<:crlf>
+layer corresponds to "text mode" on platforms that distinguish
between the two modes when opening files (which is many DOS-like
-platforms, including Windows). These two disciplines are no-ops on
+platforms, including Windows). These two layers are no-ops on
platforms where binmode() is a no-op, but perform their functions
everywhere if PerlIO is enabled.