Encode::Alias(3p) Perl Programmers Reference Guide Encode::Alias(3p) #
Encode::Alias(3p) Perl Programmers Reference Guide Encode::Alias(3p)
NNAAMMEE #
Encode::Alias - alias definitions to encodings
SSYYNNOOPPSSIISS #
use Encode;
use Encode::Alias;
define_alias( "newName" => ENCODING);
define_alias( qr/.../ => ENCODING);
define_alias( sub { return ENCODING if ...; } );
DDEESSCCRRIIPPTTIIOONN #
Allows newName to be used as an alias for ENCODING. ENCODING may be
either the name of an encoding or an encoding object (as described in
Encode).
Currently the first argument to ddeeffiinnee__aalliiaass(()) can be specified in the
following ways:
As a simple string.
As a qr// compiled regular expression, e.g.:
define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' );
In this case, if _E_N_C_O_D_I_N_G is not a reference, it is "eval"-ed in
order to allow $1 etc. to be substituted. The example is one way to
alias names as used in X11 fonts to the MIME names for the iso-8859-*
family. Note the double quotes inside the single quotes.
(or, you don't have to do this yourself because this example is
predefined)
If you are using a regex here, you have to use the quotes as shown or
it won't work. Also note that regex handling is tricky even for the
experienced. Use this feature with caution.
As a code reference, e.g.:
define_alias( sub {shift =~ /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
The same effect as the example above in a different way. The coderef
takes the alias name as an argument and returns a canonical name on
success or undef if not. Note the second argument is ignored if
provided. Use this with even more caution than the regex version.
_C_h_a_n_g_e_s _i_n _c_o_d_e _r_e_f_e_r_e_n_c_e _a_l_i_a_s_i_n_g
As of Encode 1.87, the older form
define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
no longer works.
Encode up to 1.86 internally used "local $_" to implement this older
form. But consider the code below;
use Encode;
$_ = "eeeee" ;
while (/(e)/g) {
my $utf = decode('aliased-encoding-name', $1);
print "position:",pos,"\n";
}
Prior to Encode 1.86 this fails because of "local $_".
AAlliiaass oovveerrllooaaddiinngg You can override predefined aliases by simply applying ddeeffiinnee__aalliiaass(()). The new alias is always evaluated first, and when necessary, ddeeffiinnee__aalliiaass(()) flushes the internal cache to make the new definition available.
# redirect SHIFT_JIS to MS/IBM Code Page 932, which is a
# superset of SHIFT_JIS
define_alias( qr/shift.*jis$/i => '"cp932"' );
define_alias( qr/sjis$/i => '"cp932"' );
If you want to zap all predefined aliases, you can use
Encode::Alias->undef_aliases;
to do so. And
Encode::Alias->init_aliases;
gets the factory settings back.
Note that ddeeffiinnee__aalliiaass(()) will not be able to override the canonical name
of encodings. Encodings are first looked up by canonical name before
potential aliases are tried.
SSEEEE AALLSSOO #
Encode, Encode::Supported
perl v5.36.3 2019-02-13 Encode::Alias(3p)