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Re: [cdt-dev] indexer? hierarchy? querying problem 
Nate
Thanks for the answer. From what I understand from your mail it looks perfectly like what I need and I'll try to implement this. I may have more questions but it'll probably take time as there are plenty of gaps in my understanding I need to fill in. 

Best regards
Jantje

Op 19/01/2016 om 8:27 schreef Nathan Ridge:

What I have in its simplest form is this as source code to be parsed
void setup()
{
      Serial.begin(123);
}
What I need to get as result for this case is 123. I didn't get closer than this code 
String variableName = "Serial";
   IIndexBinding[] bindings =
index.findBindings(variableName.toCharArray(),
IndexFilter.ALL_DECLARED_OR_IMPLICIT, new NullProgressMonitor());
When variableName is "Serial" or "setup" I get a list of bindings I can
inspect; but how do I get this for "Serial.begin"?

Generally speaking, the index only stores information about declarations.
It doesn't store things like information about a function call expression
occuring inside a function body.

To get this type of information, you need to get an AST for the file that
contains the code. You can get one with ITranslationUnit.getAST().

Once you have an AST, there are several ways you can get the information
you want. I'll describe one way here:
   - Use IASTTranslationUnit.getScope() get the global scope
   - Assuming "Serial" is of some type "SerialT" which is defined in the
     global scope, use IScope.find(String, IASTTranslationUnit) to find
     the binding representing this type. It should implement ICPPClassType.
   - Use ICPPClassType.getMethods() to get a list of methods of this type.
      Iterate through the list to find the one named "begin".
   - Use IASTTranslationUnit.getReferences() on the ICPPMethod representing
     the 'begin' method to find all the places where it's called.
   - Loop through the references, and examine the surrounding AST to
      find the value you need. In your case:
        - the reference to 'begin' will be an IASTName
        - its parent should be an IASTFieldReference representing 'Serial.begin'
        - its parent should be an IASTFunctionCallExpression representing
          'Serial.begin(123)'
        - the function call expression will have an argument expression of type
           IASTLiteralExpression
        - IASTLiteralExpression.getValue() will give you the '123'

Hope that helps,
Nate

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