Perform hangman variable substitution on variables with later precedence
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Key: SHINDIG-1320
URL: https://issues.apache.org/jira/browse/SHINDIG-1320
Project: Shindig
Issue Type: Improvement
Components: Java
Reporter: Mat Mannion
Priority: Minor
The OpenSocial 0.9 specification
http://www.opensocial.org/Technical-Resources/opensocial-spec-v09/Gadgets-API-Specification.html#process
has no explicit statement that says that hangman variables should be
substituted in any kind of order or with precedence, but there are some gadgets
that rely on this behaviour in iGoogle, for example their to do list gadget:
http://www.google.com/ig/modules/todo.xml
In the case of a gadget specification as follows:
<Module>
<ModulePrefs title="__UP_title__">
<Locale>
<msg name="title">Gadget title</msg>
</Locale>
</ModulePrefs>
<UserPref name="title" default_value="__MSG_title__" />
<Content />
</Module>
it seems reasonable that the content would be "Gadget title", rather than
"__MSG_title__" as it is at the moment. The Substitutions class already has
some vague comments relating to precedence that don't seem to have been applied
to the actual substitutions.
Since the spec already has an order in the way it is written (MSG -> UP ->
MODULE -> BIDI) it would seem reasonable to replicate this ordering in both the
Substitutions.Type enum and in the order that substitutions are added in
VariableSubstituter.substitute(), and then to allow substitutions to use
pre-existing substitutions when they are added.
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