Unix text doc with a .gif image Post: 82945

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LEARN ABOUT DEBIAN

petal::i18n

Petal::I18N(3pm)					User Contributed Perl Documentation					  Petal::I18N(3pm)

NAME

       Petal::I18N - Attempt at implementing ZPT I18N for Petal

SYNOPSIS

       in your Perl code:

	 use Petal;
	 use Petal::TranslationService::Gettext;

	 my $translation_service = new Petal::TranslationService::Gettext (
	     locale_dir  => '/path/to/my/app/locale',
	     target_lang => gimme_target_lang(),
	 );

	 my $template = new Petal (
	     file => 'example.html',
	     translation_service => $translation_service
	 );

	 # we want to internationalize to the h4x0rz 31337 l4nGu4g3z. w00t!
	 my $translation_service = Petal::TranslationService::h4x0r->new();
	 my $template = new Petal (
	     file => 'silly_example.xhtml',
	     translation_service => $ts,
	 );

	 print $template->process ();

I18N Howto
   Preparing your templates:
       Say your un-internationalized template looks like this:

	 <html xmlns:tal="http://purl.org/petal/1.0/">
	   <body>
	     <img src="/images/my_logo.png"
		  alt="the logo of our organisation" />

	     <p>Hello,
		<span petal:content="user_name">Joe</span>.</p>

	     <p>How are you today?</p>
	   </body>
	 </html>

       You need to markup your template according to the ZPT I18N specification, which can be found at
       http://dev.zope.org/Wikis/DevSite/Projects/ComponentArchitecture/ZPTInternationalizationSupport

	 <html xmlns:tal="http://purl.org/petal/1.0/"
	       xmlns:i18n="http://xml.zope.org/namespaces/i18n"
	       i18n:domain="my_app">
	   <body>
	     <img src="/images/my_logo.png"
		  alt="the logo of our organisation"
		  i18n:attributes="alt" />
	     <p i18n:translate="">Hello, <span petal:content="user_name">Joe</span>.</p>
	     <p i18n:translate="">How are you today?</p>
	   </body>
	 </html>

   Extracting I18N strings:
       Once your templates are marked up properly, you will need to use a tool to extract the I18N strings into .pot (po template) files. To my
       knowledge you can use i18ndude (standalone python executable), i18nextract.py (part of Zope 3), or I18NFool.

       I use i18ndude to find strings which are not marked up properly with i18n:translate attributes and I18NFool for extracting strings and
       managing .po files.

       Assuming you're using i18nfool:

	 mkdir -p /path/to/my/app/locale
	 cd /path/to/my/app/locale
	 i18nfool-extract /path/to/my/template/example.html
	 mkdir en
	 mkdir fr
	 mkdir es
	 i18nfool-update

       Then you translate the .po files into their respective target languages. When that's done, you type:

	 cd /path/to/my/app/locale
	 i18nfool-build

       And it builds all the .mo files.

   Making your application use a Gettext translation service:
       Previously you might have had:

	 use Petal;
	 # lotsa code here
	 my $template = Petal->new ('example.html');

       This needs to become:

	 use Petal;
	 use Petal::TranslationService::Gettext;
	 # lotsa code here
	 my $template = Petal->new ('example.html');
	 $template->{translation_service} = Petal::TranslationService::Gettext->new (
	     locale_dir  => '/path/to/my/app/locale',
	     target_lang => gimme_language_code(),
	 );

       Where gimme_language_code() returns a language code depending on LC_LANG, content-negotiation, config-file, or whatever mechanism you are
       using to decide which language is desired.

   And then?
       And then that's it! Your application should be easily internationalizable.  There are a few traps / gotchas thought, which are described
       below.

BUGS, TRAPS, GOTCHAS and other niceties
   Translation Phase
       The translation step takes place ONLY ONCE THE TEMPLATE HAS BEEN PROCESSED.

       So if you have:

	 <p i18n:translate="">Hello,
	   <span i18n:name="user_login" tal:replace="self/user_login">Joe</span>
	 </p>

       It most likely will not work because the tal:replace would remove the <span> tag and also the i18n:name in the process.

       This means that instead of receiving something such as:

	 Hello, ${user_login}

       The translation service would receive:

	 Hello, Fred Flintstone

       Or

	 Hello, Joe SixPack

       etc.

       To fix this issue, use tal:content instead of tal:replace and leave the span and its i18n:name attribute.

   Character sets
       I haven't worried too much about them (yet) so if you run into trouble join the Petal mailing list and we'll try to fix any issues
       together.

   Limitations
       At the moment, Petal::I18N supports the following constructs:

       xmlns:i18n="http://xml.zope.org/namespaces/i18n"
       i18n:translate
       i18n:domain
       i18n:name
       i18n:attribute

       It does *NOT* (well, not yet) support i18n:source, i18n:target or i18n:data.

perl v5.12.4							    2011-08-25							  Petal::I18N(3pm)

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