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NAME
Locale::Maketext::TPJ13 -- article about software localization
SYNOPSIS
# This an article, not a module.
DESCRIPTION
The following article by Sean M. Burke and Jordan Lachler first appeared in The Perl
Journal #13 and is copyright 1999 The Perl Journal. It appears courtesy of Jon Orwant and
The Perl Journal. This document may be distributed under the same terms as Perl itself.
Localization and Perl: gettext breaks, Maketext fixes
by Sean M. Burke and Jordan Lachler
This article points out cases where gettext (a common system for localizing software
interfaces -- i.e., making them work in the user's language of choice) fails because of
basic differences between human languages. This article then describes Maketext, a new
system capable of correctly treating these differences.
A Localization Horror Story: It Could Happen To You
"There are a number of languages spoken by human beings in this world."
-- Harald Tveit Alvestrand, in RFC 1766, "Tags for the Identification of Languages"
Imagine that your task for the day is to localize a piece of software -- and luckily for
you, the only output the program emits is two messages, like this:
I scanned 12 directories.
Your query matched 10 files in 4 directories.
So how hard could that be? You look at the code that produces the first item, and it
reads:
printf("I scanned %g directories.",
$directory_count);
You think about that, and realize that it doesn't even work right for English, as it can
produce this output:
I scanned 1 directories.
So you rewrite it to read:
printf("I scanned %g %s.",
$directory_count,
$directory_count == 1 ?
"directory" : "directories",
);
...which does the Right Thing. (In case you don't recall, "%g" is for locale-specific
number interpolation, and "%s" is for string interpolation.)
But you still have to localize it for all the languages you're producing this software
for, so you pull Locale::gettext off of CPAN so you can access the "gettext" C functions
you've heard are standard for localization tasks.
And you write:
printf(gettext("I scanned %g %s."),
$dir_scan_count,
$dir_scan_count == 1 ?
gettext("directory") : gettext("directories"),
);
But you then read in the gettext manual (Drepper, Miller, and Pinard 1995) that this is
not a good idea, since how a single word like "directory" or "directories" is translated
may depend on context -- and this is true, since in a case language like German or
Russian, you'd may need these words with a different case ending in the first instance
(where the word is the object of a verb) than in the second instance, which you haven't
even gotten to yet (where the word is the object of a preposition, "in %g directories") --
assuming these keep the same syntax when translated into those languages.
So, on the advice of the gettext manual, you rewrite:
printf( $dir_scan_count == 1 ?
gettext("I scanned %g directory.") :
gettext("I scanned %g directories."),
$dir_scan_count );
So, you email your various translators (the boss decides that the languages du jour are
Chinese, Arabic, Russian, and Italian, so you have one translator for each), asking for
translations for "I scanned %g directory." and "I scanned %g directories.". When they
reply, you'll put that in the lexicons for gettext to use when it localizes your software,
so that when the user is running under the "zh" (Chinese) locale, gettext("I scanned %g
directory.") will return the appropriate Chinese text, with a "%g" in there where printf
can then interpolate $dir_scan.
Your Chinese translator emails right back -- he says both of these phrases translate to
the same thing in Chinese, because, in linguistic jargon, Chinese "doesn't have number as
a grammatical category" -- whereas English does. That is, English has grammatical rules
that refer to "number", i.e., whether something is grammatically singular or plural; and
one of these rules is the one that forces nouns to take a plural suffix (generally "s")
when in a plural context, as they are when they follow a number other than "one"
(including, oddly enough, "zero"). Chinese has no such rules, and so has just the one
phrase where English has two. But, no problem, you can have this one Chinese phrase
appear as the translation for the two English phrases in the "zh" gettext lexicon for your
program.
Emboldened by this, you dive into the second phrase that your software needs to output:
"Your query matched 10 files in 4 directories.". You notice that if you want to treat
phrases as indivisible, as the gettext manual wisely advises, you need four cases now,
instead of two, to cover the permutations of singular and plural on the two items,
$dir_count and $file_count. So you try this:
printf( $file_count == 1 ?
( $directory_count == 1 ?
gettext("Your query matched %g file in %g directory.") :
gettext("Your query matched %g file in %g directories.") ) :
( $directory_count == 1 ?
gettext("Your query matched %g files in %g directory.") :
gettext("Your query matched %g files in %g directories.") ),
$file_count, $directory_count,
);
(The case of "1 file in 2 [or more] directories" could, I suppose, occur in the case of
symlinking or something of the sort.)
It occurs to you that this is not the prettiest code you've ever written, but this seems
the way to go. You mail off to the translators asking for translations for these four
cases. The Chinese guy replies with the one phrase that these all translate to in
Chinese, and that phrase has two "%g"s in it, as it should -- but there's a problem. He
translates it word-for-word back: "In %g directories contains %g files match your query."
The %g slots are in an order reverse to what they are in English. You wonder how you'll
get gettext to handle that.
But you put it aside for the moment, and optimistically hope that the other translators
won't have this problem, and that their languages will be better behaved -- i.e., that
they will be just like English.
But the Arabic translator is the next to write back. First off, your code for "I scanned
%g directory." or "I scanned %g directories." assumes there's only singular or plural.
But, to use linguistic jargon again, Arabic has grammatical number, like English (but
unlike Chinese), but it's a three-term category: singular, dual, and plural. In other
words, the way you say "directory" depends on whether there's one directory, or two of
them, or more than two of them. Your test of "($directory == 1)" no longer does the job.
And it means that where English's grammatical category of number necessitates only the two
permutations of the first sentence based on "directory [singular]" and "directories
[plural]", Arabic has three -- and, worse, in the second sentence ("Your query matched %g
file in %g directory."), where English has four, Arabic has nine. You sense an unwelcome,
exponential trend taking shape.
Your Italian translator emails you back and says that "I searched 0 directories" (a
possible English output of your program) is stilted, and if you think that's fine English,
that's your problem, but that just will not do in the language of Dante. He insists that
where $directory_count is 0, your program should produce the Italian text for "I didn't
scan any directories.". And ditto for "I didn't match any files in any directories",
although he says the last part about "in any directories" should probably just be left
off.
You wonder how you'll get gettext to handle this; to accommodate the ways Arabic, Chinese,
and Italian deal with numbers in just these few very simple phrases, you need to write
code that will ask gettext for different queries depending on whether the numerical values
in question are 1, 2, more than 2, or in some cases 0, and you still haven't figured out
the problem with the different word order in Chinese.
Then your Russian translator calls on the phone, to personally tell you the bad news about
how really unpleasant your life is about to become:
Russian, like German or Latin, is an inflectional language; that is, nouns and adjectives
have to take endings that depend on their case (i.e., nominative, accusative, genitive,
etc...) -- which is roughly a matter of what role they have in syntax of the sentence --
as well as on the grammatical gender (i.e., masculine, feminine, neuter) and number (i.e.,
singular or plural) of the noun, as well as on the declension class of the noun. But
unlike with most other inflected languages, putting a number-phrase (like "ten" or "forty-
three", or their Arabic numeral equivalents) in front of noun in Russian can change the
case and number that noun is, and therefore the endings you have to put on it.
He elaborates: In "I scanned %g directories", you'd expect "directories" to be in the
accusative case (since it is the direct object in the sentence) and the plural number,
except where $directory_count is 1, then you'd expect the singular, of course. Just like
Latin or German. But! Where $directory_count % 10 is 1 ("%" for modulo, remember),
assuming $directory count is an integer, and except where $directory_count % 100 is 11,
"directories" is forced to become grammatically singular, which means it gets the ending
for the accusative singular... You begin to visualize the code it'd take to test for the
problem so far, and still work for Chinese and Arabic and Italian, and how many gettext
items that'd take, but he keeps going... But where $directory_count % 10 is 2, 3, or 4
(except where $directory_count % 100 is 12, 13, or 14), the word for "directories" is
forced to be genitive singular -- which means another ending... The room begins to spin
around you, slowly at first... But with all other integer values, since "directory" is an
inanimate noun, when preceded by a number and in the nominative or accusative cases (as it
is here, just your luck!), it does stay plural, but it is forced into the genitive case --
yet another ending... And you never hear him get to the part about how you're going to
run into similar (but maybe subtly different) problems with other Slavic languages like
Polish, because the floor comes up to meet you, and you fade into unconsciousness.
The above cautionary tale relates how an attempt at localization can lead from programmer
consternation, to program obfuscation, to a need for sedation. But careful evaluation
shows that your choice of tools merely needed further consideration.
The Linguistic View
"It is more complicated than you think."
-- The Eighth Networking Truth, from RFC 1925
The field of Linguistics has expended a great deal of effort over the past century trying
to find grammatical patterns which hold across languages; it's been a constant process of
people making generalizations that should apply to all languages, only to find out that,
all too often, these generalizations fail -- sometimes failing for just a few languages,
sometimes whole classes of languages, and sometimes nearly every language in the world
except English. Broad statistical trends are evident in what the "average language" is
like as far as what its rules can look like, must look like, and cannot look like. But
the "average language" is just as unreal a concept as the "average person" -- it runs up
against the fact no language (or person) is, in fact, average. The wisdom of past
experience leads us to believe that any given language can do whatever it wants, in any
order, with appeal to any kind of grammatical categories wants -- case, number, tense,
real or metaphoric characteristics of the things that words refer to, arbitrary or
predictable classifications of words based on what endings or prefixes they can take,
degree or means of certainty about the truth of statements expressed, and so on, ad
infinitum.
Mercifully, most localization tasks are a matter of finding ways to translate whole
phrases, generally sentences, where the context is relatively set, and where the only
variation in content is usually in a number being expressed -- as in the example sentences
above. Translating specific, fully-formed sentences is, in practice, fairly foolproof --
which is good, because that's what's in the phrasebooks that so many tourists rely on.
Now, a given phrase (whether in a phrasebook or in a gettext lexicon) in one language
might have a greater or lesser applicability than that phrase's translation into another
language -- for example, strictly speaking, in Arabic, the "your" in "Your query
matched..." would take a different form depending on whether the user is male or female;
so the Arabic translation "your[feminine] query" is applicable in fewer cases than the
corresponding English phrase, which doesn't distinguish the user's gender. (In practice,
it's not feasible to have a program know the user's gender, so the masculine "you" in
Arabic is usually used, by default.)
But in general, such surprises are rare when entire sentences are being translated,
especially when the functional context is restricted to that of a computer interacting
with a user either to convey a fact or to prompt for a piece of information. So, for
purposes of localization, translation by phrase (generally by sentence) is both the
simplest and the least problematic.
Breaking gettext
"It Has To Work."
-- First Networking Truth, RFC 1925
Consider that sentences in a tourist phrasebook are of two types: ones like "How do I get
to the marketplace?" that don't have any blanks to fill in, and ones like "How much do
these ___ cost?", where there's one or more blanks to fill in (and these are usually
linked to a list of words that you can put in that blank: "fish", "potatoes", "tomatoes",
etc.) The ones with no blanks are no problem, but the fill-in-the-blank ones may not be
really straightforward. If it's a Swahili phrasebook, for example, the authors probably
didn't bother to tell you the complicated ways that the verb "cost" changes its
inflectional prefix depending on the noun you're putting in the blank. The trader in the
marketplace will still understand what you're saying if you say "how much do these
potatoes cost?" with the wrong inflectional prefix on "cost". After all, you can't speak
proper Swahili, you're just a tourist. But while tourists can be stupid, computers are
supposed to be smart; the computer should be able to fill in the blank, and still have the
results be grammatical.
In other words, a phrasebook entry takes some values as parameters (the things that you
fill in the blank or blanks), and provides a value based on these parameters, where the
way you get that final value from the given values can, properly speaking, involve an
arbitrarily complex series of operations. (In the case of Chinese, it'd be not at all
complex, at least in cases like the examples at the beginning of this article; whereas in
the case of Russian it'd be a rather complex series of operations. And in some languages,
the complexity could be spread around differently: while the act of putting a number-
expression in front of a noun phrase might not be complex by itself, it may change how you
have to, for example, inflect a verb elsewhere in the sentence. This is what in syntax is
called "long-distance dependencies".)
This talk of parameters and arbitrary complexity is just another way to say that an entry
in a phrasebook is what in a programming language would be called a "function". Just so
you don't miss it, this is the crux of this article: A phrase is a function; a phrasebook
is a bunch of functions.
The reason that using gettext runs into walls (as in the above second-person horror story)
is that you're trying to use a string (or worse, a choice among a bunch of strings) to do
what you really need a function for -- which is futile. Preforming (s)printf
interpolation on the strings which you get back from gettext does allow you to do some
common things passably well... sometimes... sort of; but, to paraphrase what some people
say about "csh" script programming, "it fools you into thinking you can use it for real
things, but you can't, and you don't discover this until you've already spent too much
time trying, and by then it's too late."
Replacing gettext
So, what needs to replace gettext is a system that supports lexicons of functions instead
of lexicons of strings. An entry in a lexicon from such a system should not look like
this:
"J'ai trouv\xE9 %g fichiers dans %g r\xE9pertoires"
[\xE9 is e-acute in Latin-1. Some pod renderers would scream if I used the actual
character here. -- SB]
but instead like this, bearing in mind that this is just a first stab:
sub I_found_X1_files_in_X2_directories {
my( $files, $dirs ) = @_[0,1];
$files = sprintf("%g %s", $files,
$files == 1 ? 'fichier' : 'fichiers');
$dirs = sprintf("%g %s", $dirs,
$dirs == 1 ? "r\xE9pertoire" : "r\xE9pertoires");
return "J'ai trouv\xE9 $files dans $dirs.";
}
Now, there's no particularly obvious way to store anything but strings in a gettext
lexicon; so it looks like we just have to start over and make something better, from
scratch. I call my shot at a gettext-replacement system "Maketext", or, in CPAN terms,
Locale::Maketext.
When designing Maketext, I chose to plan its main features in terms of "buzzword
compliance". And here are the buzzwords:
Buzzwords: Abstraction and Encapsulation
The complexity of the language you're trying to output a phrase in is entirely abstracted
inside (and encapsulated within) the Maketext module for that interface. When you call:
print $lang->maketext("You have [quant,_1,piece] of new mail.",
scalar(@messages));
you don't know (and in fact can't easily find out) whether this will involve lots of
figuring, as in Russian (if $lang is a handle to the Russian module), or relatively
little, as in Chinese. That kind of abstraction and encapsulation may encourage other
pleasant buzzwords like modularization and stratification, depending on what design
decisions you make.
Buzzword: Isomorphism
"Isomorphism" means "having the same structure or form"; in discussions of program design,
the word takes on the special, specific meaning that your implementation of a solution to
a problem has the same structure as, say, an informal verbal description of the solution,
or maybe of the problem itself. Isomorphism is, all things considered, a good thing --
it's what problem-solving (and solution-implementing) should look like.
What's wrong the with gettext-using code like this...
printf( $file_count == 1 ?
( $directory_count == 1 ?
"Your query matched %g file in %g directory." :
"Your query matched %g file in %g directories." ) :
( $directory_count == 1 ?
"Your query matched %g files in %g directory." :
"Your query matched %g files in %g directories." ),
$file_count, $directory_count,
);
is first off that it's not well abstracted -- these ways of testing for grammatical number
(as in the expressions like "foo == 1 ? singular_form : plural_form") should be
abstracted to each language module, since how you get grammatical number is language-
specific.
But second off, it's not isomorphic -- the "solution" (i.e., the phrasebook entries) for
Chinese maps from these four English phrases to the one Chinese phrase that fits for all
of them. In other words, the informal solution would be "The way to say what you want in
Chinese is with the one phrase 'For your question, in Y directories you would find X
files'" -- and so the implemented solution should be, isomorphically, just a
straightforward way to spit out that one phrase, with numerals properly interpolated. It
shouldn't have to map from the complexity of other languages to the simplicity of this
one.
Buzzword: Inheritance
There's a great deal of reuse possible for sharing of phrases between modules for related
dialects, or for sharing of auxiliary functions between related languages. (By "auxiliary
functions", I mean functions that don't produce phrase-text, but which, say, return an
answer to "does this number require a plural noun after it?". Such auxiliary functions
would be used in the internal logic of functions that actually do produce phrase-text.)
In the case of sharing phrases, consider that you have an interface already localized for
American English (probably by having been written with that as the native locale, but
that's incidental). Localizing it for UK English should, in practical terms, be just a
matter of running it past a British person with the instructions to indicate what few
phrases would benefit from a change in spelling or possibly minor rewording. In that
case, you should be able to put in the UK English localization module only those phrases
that are UK-specific, and for all the rest, inherit from the American English module.
(And I expect this same situation would apply with Brazilian and Continental Portugese,
possibly with some very closely related languages like Czech and Slovak, and possibly with
the slightly different "versions" of written Mandarin Chinese, as I hear exist in Taiwan
and mainland China.)
As to sharing of auxiliary functions, consider the problem of Russian numbers from the
beginning of this article; obviously, you'd want to write only once the hairy code that,
given a numeric value, would return some specification of which case and number a given
quantified noun should use. But suppose that you discover, while localizing an interface
for, say, Ukranian (a Slavic language related to Russian, spoken by several million
people, many of whom would be relieved to find that your Web site's or software's
interface is available in their language), that the rules in Ukranian are the same as in
Russian for quantification, and probably for many other grammatical functions. While
there may well be no phrases in common between Russian and Ukranian, you could still
choose to have the Ukranian module inherit from the Russian module, just for the sake of
inheriting all the various grammatical methods. Or, probably better organizationally, you
could move those functions to a module called "_E_Slavic" or something, which Russian and
Ukrainian could inherit useful functions from, but which would (presumably) provide no
lexicon.
Buzzword: Concision
Okay, concision isn't a buzzword. But it should be, so I decree that as a new buzzword,
"concision" means that simple common things should be expressible in very few lines (or
maybe even just a few characters) of code -- call it a special case of "making simple
things easy and hard things possible", and see also the role it played in the MIDI::Simple
language, discussed elsewhere in this issue [TPJ#13].
Consider our first stab at an entry in our "phrasebook of functions":
sub I_found_X1_files_in_X2_directories {
my( $files, $dirs ) = @_[0,1];
$files = sprintf("%g %s", $files,
$files == 1 ? 'fichier' : 'fichiers');
$dirs = sprintf("%g %s", $dirs,
$dirs == 1 ? "r\xE9pertoire" : "r\xE9pertoires");
return "J'ai trouv\xE9 $files dans $dirs.";
}
You may sense that a lexicon (to use a non-committal catch-all term for a collection of
things you know how to say, regardless of whether they're phrases or words) consisting of
functions expressed as above would make for rather long-winded and repetitive code -- even
if you wisely rewrote this to have quantification (as we call adding a number expression
to a noun phrase) be a function called like:
sub I_found_X1_files_in_X2_directories {
my( $files, $dirs ) = @_[0,1];
$files = quant($files, "fichier");
$dirs = quant($dirs, "r\xE9pertoire");
return "J'ai trouv\xE9 $files dans $dirs.";
}
And you may also sense that you do not want to bother your translators with having to
write Perl code -- you'd much rather that they spend their very costly time on just
translation. And this is to say nothing of the near impossibility of finding a commercial
translator who would know even simple Perl.
In a first-hack implementation of Maketext, each language-module's lexicon looked like
this:
%Lexicon = (
"I found %g files in %g directories"
=> sub {
my( $files, $dirs ) = @_[0,1];
$files = quant($files, "fichier");
$dirs = quant($dirs, "r\xE9pertoire");
return "J'ai trouv\xE9 $files dans $dirs.";
},
... and so on with other phrase => sub mappings ...
);
but I immediately went looking for some more concise way to basically denote the same
phrase-function -- a way that would also serve to concisely denote most phrase-functions
in the lexicon for most languages. After much time and even some actual thought, I
decided on this system:
* Where a value in a %Lexicon hash is a contentful string instead of an anonymous sub (or,
conceivably, a coderef), it would be interpreted as a sort of shorthand expression of what
the sub does. When accessed for the first time in a session, it is parsed, turned into
Perl code, and then eval'd into an anonymous sub; then that sub replaces the original
string in that lexicon. (That way, the work of parsing and evaling the shorthand form for
a given phrase is done no more than once per session.)
* Calls to "maketext" (as Maketext's main function is called) happen thru a "language
session handle", notionally very much like an IO handle, in that you open one at the start
of the session, and use it for "sending signals" to an object in order to have it return
the text you want.
So, this:
$lang->maketext("You have [quant,_1,piece] of new mail.",
scalar(@messages));
basically means this: look in the lexicon for $lang (which may inherit from any number of
other lexicons), and find the function that we happen to associate with the string "You
have [quant,_1,piece] of new mail" (which is, and should be, a functioning "shorthand" for
this function in the native locale -- English in this case). If you find such a function,
call it with $lang as its first parameter (as if it were a method), and then a copy of
scalar(@messages) as its second, and then return that value. If that function was found,
but was in string shorthand instead of being a fully specified function, parse it and make
it into a function before calling it the first time.
* The shorthand uses code in brackets to indicate method calls that should be performed.
A full explanation is not in order here, but a few examples will suffice:
"You have [quant,_1,piece] of new mail."
The above code is shorthand for, and will be interpreted as, this:
sub {
my $handle = $_[0];
my(@params) = @_;
return join '',
"You have ",
$handle->quant($params[1], 'piece'),
"of new mail.";
}
where "quant" is the name of a method you're using to quantify the noun "piece" with the
number $params[0].
A string with no brackety calls, like this:
"Your search expression was malformed."
is somewhat of a degenerate case, and just gets turned into:
sub { return "Your search expression was malformed." }
However, not everything you can write in Perl code can be written in the above shorthand
system -- not by a long shot. For example, consider the Italian translator from the
beginning of this article, who wanted the Italian for "I didn't find any files" as a
special case, instead of "I found 0 files". That couldn't be specified (at least not
easily or simply) in our shorthand system, and it would have to be written out in full,
like this:
sub { # pretend the English strings are in Italian
my($handle, $files, $dirs) = @_[0,1,2];
return "I didn't find any files" unless $files;
return join '',
"I found ",
$handle->quant($files, 'file'),
" in ",
$handle->quant($dirs, 'directory'),
".";
}
Next to a lexicon full of shorthand code, that sort of sticks out like a sore thumb -- but
this is a special case, after all; and at least it's possible, if not as concise as usual.
As to how you'd implement the Russian example from the beginning of the article, well,
There's More Than One Way To Do It, but it could be something like this (using English
words for Russian, just so you know what's going on):
"I [quant,_1,directory,accusative] scanned."
This shifts the burden of complexity off to the quant method. That method's parameters
are: the numeric value it's going to use to quantify something; the Russian word it's
going to quantify; and the parameter "accusative", which you're using to mean that this
sentence's syntax wants a noun in the accusative case there, although that quantification
method may have to overrule, for grammatical reasons you may recall from the beginning of
this article.
Now, the Russian quant method here is responsible not only for implementing the strange
logic necessary for figuring out how Russian number-phrases impose case and number on
their noun-phrases, but also for inflecting the Russian word for "directory". How that
inflection is to be carried out is no small issue, and among the solutions I've seen, some
(like variations on a simple lookup in a hash where all possible forms are provided for
all necessary words) are straightforward but can become cumbersome when you need to
inflect more than a few dozen words; and other solutions (like using algorithms to model
the inflections, storing only root forms and irregularities) can involve more overhead
than is justifiable for all but the largest lexicons.
Mercifully, this design decision becomes crucial only in the hairiest of inflected
languages, of which Russian is by no means the worst case scenario, but is worse than
most. Most languages have simpler inflection systems; for example, in English or Swahili,
there are generally no more than two possible inflected forms for a given noun
("error/errors"; "kosa/makosa"), and the rules for producing these forms are fairly simple
-- or at least, simple rules can be formulated that work for most words, and you can then
treat the exceptions as just "irregular", at least relative to your ad hoc rules. A
simpler inflection system (simpler rules, fewer forms) means that design decisions are
less crucial to maintaining sanity, whereas the same decisions could incur overhead-
versus-scalability problems in languages like Russian. It may also be likely that code
(possibly in Perl, as with Lingua::EN::Inflect, for English nouns) has already been
written for the language in question, whether simple or complex.
Moreover, a third possibility may even be simpler than anything discussed above: "Just
require that all possible (or at least applicable) forms be provided in the call to the
given language's quant method, as in:"
"I found [quant,_1,file,files]."
That way, quant just has to chose which form it needs, without having to look up or
generate anything. While possibly not optimal for Russian, this should work well for most
other languages, where quantification is not as complicated an operation.
The Devil in the Details
There's plenty more to Maketext than described above -- for example, there's the details
of how language tags ("en-US", "i-pwn", "fi", etc.) or locale IDs ("en_US") interact with
actual module naming ("BogoQuery/Locale/en_us.pm"), and what magic can ensue; there's the
details of how to record (and possibly negotiate) what character encoding Maketext will
return text in (UTF8? Latin-1? KOI8?). There's the interesting fact that Maketext is for
localization, but nowhere actually has a ""use locale;"" anywhere in it. For the curious,
there's the somewhat frightening details of how I actually implement something like data
inheritance so that searches across modules' %Lexicon hashes can parallel how Perl
implements method inheritance.
And, most importantly, there's all the practical details of how to actually go about
deriving from Maketext so you can use it for your interfaces, and the various tools and
conventions for starting out and maintaining individual language modules.
That is all covered in the documentation for Locale::Maketext and the modules that come
with it, available in CPAN. After having read this article, which covers the why's of
Maketext, the documentation, which covers the how's of it, should be quite
straightforward.
The Proof in the Pudding: Localizing Web Sites
Maketext and gettext have a notable difference: gettext is in C, accessible thru C library
calls, whereas Maketext is in Perl, and really can't work without a Perl interpreter
(although I suppose something like it could be written for C). Accidents of history (and
not necessarily lucky ones) have made C++ the most common language for the implementation
of applications like word processors, Web browsers, and even many in-house applications
like custom query systems. Current conditions make it somewhat unlikely that the next one
of any of these kinds of applications will be written in Perl, albeit clearly more for
reasons of custom and inertia than out of consideration of what is the right tool for the
job.
However, other accidents of history have made Perl a well-accepted language for design of
server-side programs (generally in CGI form) for Web site interfaces. Localization of
static pages in Web sites is trivial, feasable either with simple language-negotiation
features in servers like Apache, or with some kind of server-side inclusions of language-
appropriate text into layout templates. However, I think that the localization of Perl-
based search systems (or other kinds of dynamic content) in Web sites, be they public or
access-restricted, is where Maketext will see the greatest use.
I presume that it would be only the exceptional Web site that gets localized for English
and Chinese and Italian and Arabic and Russian, to recall the languages from the beginning
of this article -- to say nothing of German, Spanish, French, Japanese, Finnish, and
Hindi, to name a few languages that benefit from large numbers of programmers or Web
viewers or both.
However, the ever-increasing internationalization of the Web (whether measured in terms of
amount of content, of numbers of content writers or programmers, or of size of content
audiences) makes it increasingly likely that the interface to the average Web-based
dynamic content service will be localized for two or maybe three languages. It is my hope
that Maketext will make that task as simple as possible, and will remove previous barriers
to localization for languages dissimilar to English.
__END__
Sean M. Burke (sburke@cpan.org) has a Master's in linguistics from Northwestern
University; he specializes in language technology. Jordan Lachler (lachler@unm.edu) is a
PhD student in the Department of Linguistics at the University of New Mexico; he
specializes in morphology and pedagogy of North American native languages.
References
Alvestrand, Harald Tveit. 1995. RFC 1766: Tags for the Identification of Languages.
"http://www.ietf.org/rfc/rfc1766.txt" [Now see RFC 3066.]
Callon, Ross, editor. 1996. RFC 1925: The Twelve Networking Truths.
"http://www.ietf.org/rfc/rfc1925.txt"
Drepper, Ulrich, Peter Miller, and Francois Pinard. 1995-2001. GNU "gettext". Available
in "ftp://prep.ai.mit.edu/pub/gnu/", with extensive docs in the distribution tarball.
[Since I wrote this article in 1998, I now see that the gettext docs are now trying more
to come to terms with plurality. Whether useful conclusions have come from it is another
question altogether. -- SMB, May 2001]
Forbes, Nevill. 1964. Russian Grammar. Third Edition, revised by J. C. Dumbreck.
Oxford University Press.