i18n is a macro driven internationalization/localization toolkit for Haxe.
Almost the same procedure with localization, except two:
I18n.locale(loc: String): set target locale, 'default', 'global' & arbitary custom locales e.g. 'zh', 'fr', can be used.
I18n.assets(path: String): set the output assets folder, by default it's "assets/i18n". The folder is for storing all locale sensitive resource files.
To set compiler options in NME project, simply add two lines in NMML file, e.g.:
<compilerflag name="--macro com.roxstudio.i18n.I18n.locale('zh')" />
<compilerflag name="--macro com.roxstudio.i18n.I18n.assets('res/i18n')" />
Assume I have original "i18n_work/default/strings.xml" like this:
<strings>
<file path="Main.hx">
<t id="Hello">Hello</t><!--line 12-->
</file>
</strings>
And the Chinese translation is ready at "i18n_work/zh/strings.xml", like this:
<strings>
<file path="Main.hx">
<t id="Hello">你好</t>
</file>
</strings>
When I target 'zh' locale and build the project, the original haxe code in Main.hx:
textfield.text = "Hello".i18n();
will be transformed to (at compile-time):
textfield.text = "你好";
When I target 'global' locale and build the project, the code will be transformed to:
textfield.text = Global.str(0);
Global.str() is a run-time method for quick-access to the string mapping.
While using 'global' locale, your app will gain the capability of launch-time locale switching. E.g.:
I18n.init();
I18n.setCurrentLocale(flash.system.Capabilities.language);
If the desired locale is not supported, then it will fallback to 'default'.
Run-time locale switching is a little bit more tricky then launch-time approach, normally it needs to do some extra operations to handle the string changes, e.g. UI refreshing etc. Here's the approach used by I18n.
var textfield = new TextField();
I18n.onChange(textfield.text = 'Hello'.i18n());
This will be transformd to:
var textfield = new TextField();
var __i18n_callb__ = function() { textfield.text = Global.str(0); }
Global.addListener("current code location", __i18n_callb__);
__i18n_callb__();
And the "__i18n_callb__" will be invoked again if Global.setCurrentLocale() get called.
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