GWT: getting compile-time locales list from external resource

We need to store locales list externally in our project and just let GWT to read it at compile-time to produce permutations.

So, instead of this:

<extend-property name="locale" values="en_US" />    
<extend-property name="locale" values="ru_RU" /> 
<extend-property name="locale" values="fr_FR" />
<extend-property name="locale" values="es_ES" />

We need something like:

<use-property name="locale" source="../../localesList.properties" if-not-found="en_US,fr_FE,es_ES" />

property-providers is a different thing, because they help for client to determine locale at run-time, so they will not produce those funny permutations

The worse way is to inject locale properties in EntryPoint.gwt.xml using some script at server-side

Do I missed something or there is no other way to make this in GWT excludin开发者_如何学运维g this injection?

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I'd preprocess the *.gwt.xml file(s) and add the needed locales (say, use an ant task, and just do some dom manipulation, or even, just use a @FILTER@ filter to do a replace), before compiling the gwt code.