libelling - tokens/AST and the preprocessor

Clang Frontend
1

So libclang makes tokenising and thus syntax highlighting easy; but ... what I'm struggling with is #ifdef blocks - specifically those which are compiled (out as I want to highlight them differently)

A quick test show that given the following code:

#ifdef EXCLUDE
int a = 0;
#endif

I always get the same tokens (#, ifdef, EXCLUDE, int, a, =, 0, ;, #, endif). But depending on the value of EXCLUDE the AST behind those tokens changes - when excluded they are all put in a single COMPOUND_STMT.

The question is, how do I tell these tokens have been excluded from the compile; and thus I can mark them as dimmed?

I've tried most things I can think of but still can't figure out how to take an AST cursor and get if it was actually included.

Thanks

Rich

2

Hello,

When create Preprocessor add own PPCallbacks impl with implemented SourceRangeSkipped to track dead blocks.

Hope it helps,
Vladimir.

3

If you are using pure libclang.
Then your method is
CINDEX_LINKAGE CXSourceRangeList *clang_getSkippedRanges(CXTranslationUnit tu,
                                                          CXFile file);

Vladimir.