Manual Pages for Linux CentOS command on man Encode::Alias
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Manual Pages for Linux CentOS command on man Encode::Alias

Encode::Alias(3) User Contributed Perl Documentation Encode::Alias(3)

NAME

Encode::Alias - alias definitions to encodings SYNOPSIS use Encode; use Encode::Alias; definealias( "newName" => ENCODING); definealias( qr/.../ => ENCODING); definealias( sub { return ENCODING if ...; } ); DESCRIPTION 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 definealias() can be specified in the following ways: As a simple string. As a qr// compiled regular expression, e.g.:

definealias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' );

In this case, if ENCODING 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.:

definealias( 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. Changes in code reference aliasing As of Encode 1.87, the older form

definealias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } ); no longer works.

Encode up to 1.86 internally used "local $" to implement ths 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 $". Alias overloading You can override predefined aliases by simply applying definealias(). The new alias is always evaluated first, and when necessary, definealias() flushes the internal cache to make the new definition available.

# redirect SHIFTJIS to MS/IBM Code Page 932, which is a

# superset of SHIFTJIS

definealias( qr/shift.*jis$/i => '"cp932"' );

definealias( qr/sjis$/i => '"cp932"' ); If you want to zap all predefined aliases, you can use

Encode::Alias->undefaliases; to do so. And

Encode::Alias->initaliases; gets the factory settings back. Note that definealias() will not be able to override the canonical name of encodings. Encodings are first looked up by canonical name before potential aliases are tried. SEE ALSO Encode, Encode::Supported

perl v5.16.3 2013-04-29 Encode::Alias(3)




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