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15.5.18.3 How to Extract Hash Keys
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Translating messages at runtime is normally performed by looking up the
original string in the translation database and returning the
translated version. The "natural" Perl implementation is a hash
lookup, and, of course, `xgettext' supports such practice.
print __"Hello world!";
print $__{"Hello world!"};
print $__->{"Hello world!"};
print $$__{"Hello world!"};
The above four lines all do the same thing. The Perl module
`Locale::TextDomain' exports by default a hash `%__' that is tied to
the function `__()'. It also exports a reference `$__' to `%__'.
If an argument to the `xgettext' option `--keyword', resp. `-k'
starts with a percent sign, the rest of the keyword is interpreted as
the name of a hash. If it starts with a dollar sign, the rest of the
keyword is interpreted as a reference to a hash.
Note that you can omit the quotation marks (single or double) around
the hash key (almost) whenever Perl itself allows it:
print $gettext{Error};
The exact rule is: You can omit the surrounding quotes, when the hash
key is a valid C (!) identifier, i.e. when it starts with an underscore
or an ASCII letter and is followed by an arbitrary number of
underscores, ASCII letters or digits. Other Unicode characters are
_not_ allowed, regardless of the `use utf8' pragma.
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