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<title>Locale::Language - ISO two letter codes for language identification</title>
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<h1><a>Locale::Language - ISO two letter codes for language identification</a></h1>
<p><a name="__index__"></a></p>

<!-- INDEX BEGIN -->

<ul>

	<li><a href="#name">NAME</a></li>
	<li><a href="#synopsis">SYNOPSIS</a></li>
	<li><a href="#description">DESCRIPTION</a></li>
	<li><a href="#conversion_routines">CONVERSION ROUTINES</a></li>
	<li><a href="#query_routines">QUERY ROUTINES</a></li>
	<li><a href="#examples">EXAMPLES</a></li>
	<li><a href="#known_bugs_and_limitations">KNOWN BUGS AND LIMITATIONS</a></li>
	<li><a href="#see_also">SEE ALSO</a></li>
	<li><a href="#author">AUTHOR</a></li>
	<li><a href="#copyright">COPYRIGHT</a></li>
</ul>
<!-- INDEX END -->

<hr />
<p>
</p>
<h1><a name="name">NAME</a></h1>
<p>Locale::Language - ISO two letter codes for language identification (ISO 639)</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
    <span class="keyword">use</span> <span class="variable">Locale::Language</span><span class="operator">;</span>
    
    <span class="variable">$lang</span> <span class="operator">=</span> <span class="variable">code2language</span><span class="operator">(</span><span class="string">'en'</span><span class="operator">);</span>        <span class="comment"># $lang gets 'English'</span>
    <span class="variable">$code</span> <span class="operator">=</span> <span class="variable">language2code</span><span class="operator">(</span><span class="string">'French'</span><span class="operator">);</span>    <span class="comment"># $code gets 'fr'</span>
    
    <span class="variable">@codes</span>   <span class="operator">=</span> <span class="variable">all_language_codes</span><span class="operator">();</span>
    <span class="variable">@names</span>   <span class="operator">=</span> <span class="variable">all_language_names</span><span class="operator">();</span>
</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>The <code>Locale::Language</code> module provides access to the ISO two-letter
codes for identifying languages, as defined in ISO 639. You can either
access the codes via the <a href="#conversion_routines">conversion routines</a> (described below),
or via the two functions which return lists of all language codes or
all language names.</p>
<p>
</p>
<hr />
<h1><a name="conversion_routines">CONVERSION ROUTINES</a></h1>
<p>There are two conversion routines: <a href="#item_code2language"><code>code2language()</code></a> and <a href="#item_language2code"><code>language2code()</code></a>.</p>
<dl>
<dt><strong><a name="item_code2language"><code>code2language()</code></a></strong>

<dd>
<p>This function takes a two letter language code and returns a string
which contains the name of the language identified. If the code is
not a valid language code, as defined by ISO 639, then <a href="../../lib/Pod/perlfunc.html#item_undef"><code>undef</code></a>
will be returned.</p>
</dd>
<dd>
<pre>
    <span class="variable">$lang</span> <span class="operator">=</span> <span class="variable">code2language</span><span class="operator">(</span><span class="variable">$code</span><span class="operator">);</span>
</pre>
</dd>
</li>
<dt><strong><a name="item_language2code"><code>language2code()</code></a></strong>

<dd>
<p>This function takes a language name and returns the corresponding
two letter language code, if such exists.
If the argument could not be identified as a language name,
then <a href="../../lib/Pod/perlfunc.html#item_undef"><code>undef</code></a> will be returned.</p>
</dd>
<dd>
<pre>
    <span class="variable">$code</span> <span class="operator">=</span> <span class="variable">language2code</span><span class="operator">(</span><span class="string">'French'</span><span class="operator">);</span>
</pre>
</dd>
<dd>
<p>The case of the language name is not important.
See the section <a href="#known_bugs_and_limitations">KNOWN BUGS AND LIMITATIONS</a> below.</p>
</dd>
</li>
</dl>
<p>
</p>
<hr />
<h1><a name="query_routines">QUERY ROUTINES</a></h1>
<p>There are two function which can be used to obtain a list of all
language codes, or all language names:</p>
<dl>
<dt><strong><a name="item_all_language_codes"><code>all_language_codes()</code></a></strong>

<dd>
<p>Returns a list of all two-letter language codes.
The codes are guaranteed to be all lower-case,
and not in any particular order.</p>
</dd>
</li>
<dt><strong><a name="item_all_language_names"><code>all_language_names()</code></a></strong>

<dd>
<p>Returns a list of all language names for which there is a corresponding
two-letter language code. The names are capitalised, and not returned
in any particular order.</p>
</dd>
</li>
</dl>
<p>
</p>
<hr />
<h1><a name="examples">EXAMPLES</a></h1>
<p>The following example illustrates use of the <a href="#item_code2language"><code>code2language()</code></a> function.
The user is prompted for a language code, and then told the corresponding
language name:</p>
<pre>
    <span class="variable">$|</span> <span class="operator">=</span> <span class="number">1</span><span class="operator">;</span>    <span class="comment"># turn off buffering</span>
    
    <span class="keyword">print</span> <span class="string">"Enter language code: "</span><span class="operator">;</span>
    <span class="keyword">chop</span><span class="operator">(</span><span class="variable">$code</span> <span class="operator">=</span> <span class="operator">&lt;</span><span class="variable">STDIN</span><span class="operator">&gt;);</span>
    <span class="variable">$lang</span> <span class="operator">=</span> <span class="variable">code2language</span><span class="operator">(</span><span class="variable">$code</span><span class="operator">);</span>
    <span class="keyword">if</span> <span class="operator">(</span><span class="keyword">defined</span> <span class="variable">$lang</span><span class="operator">)</span>
    <span class="operator">{</span>
        <span class="keyword">print</span> <span class="string">"$code = $lang\n"</span><span class="operator">;</span>
    <span class="operator">}</span>
    <span class="keyword">else</span>
    <span class="operator">{</span>
        <span class="keyword">print</span> <span class="string">"'$code' is not a valid language code!\n"</span><span class="operator">;</span>
    <span class="operator">}</span>
</pre>
<p>
</p>
<hr />
<h1><a name="known_bugs_and_limitations">KNOWN BUGS AND LIMITATIONS</a></h1>
<ul>
<li>
<p>In the current implementation, all data is read in when the
module is loaded, and then held in memory.
A lazy implementation would be more memory friendly.</p>
</li>
<li>
<p>Currently just supports the two letter language codes -
there are also three-letter codes, and numbers.
Would these be of any use to anyone?</p>
</li>
</ul>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<dl>
<dt><strong><a name="item_locale_3a_3acountry">Locale::Country</a></strong>

<dd>
<p>ISO codes for identification of country (ISO 3166).
Supports 2-letter, 3-letter, and numeric country codes.</p>
</dd>
</li>
<dt><strong><a name="item_locale_3a_3ascript">Locale::Script</a></strong>

<dd>
<p>ISO codes for identification of written scripts (ISO 15924).</p>
</dd>
</li>
<dt><strong><a name="item_locale_3a_3acurrency">Locale::Currency</a></strong>

<dd>
<p>ISO three letter codes for identification of currencies and funds (ISO 4217).</p>
</dd>
</li>
<dt><strong><a name="item_1988">ISO 639:1988 (E/F)</a></strong>

<dd>
<p>Code for the representation of names of languages.</p>
</dd>
</li>
<dt><strong><a name="item_http_3a_2f_2flcweb_2eloc_2egov_2fstandards_2fiso63"><a href="http://lcweb.loc.gov/standards/iso639-2/langhome.html">http://lcweb.loc.gov/standards/iso639-2/langhome.html</a></a></strong>

<dd>
<p>Home page for ISO 639-2.</p>
</dd>
</li>
</dl>
<p>
</p>
<hr />
<h1><a name="author">AUTHOR</a></h1>
<p>Neil Bowers &lt;<a href="mailto:neil@bowers.com">neil@bowers.com</a>&gt;</p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright (C) 2002-2004, Neil Bowers.</p>
<p>Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).</p>
<p>This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.</p>

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