[Cpptool-develop] Preprocessing implementation has been added to the repository

[Andre B. <and...@gm...>]

a small description how preprocessing has been integrated into the 
refactoring tool.

The preprocessor has replaced the former 'NoneSemanticBlanker' which was
some special kind of preprocessing handling comments and strings. The
preprocessor class still uses this blanker class to do the required 
processing
after doing the usual preprocessing.

The current implementation of preprocessing does currently support only 
simple
macro replacements. This shows that the idea works. A next goal should 
be the
handling of #include directives. I will check this in the next weeks.

However, all preprocessing operations do change the text - how can we 
trace back
these modifications when doing our refactorings ? Well, I have 
implemented this
tracking very simple by using the TransformationList which was 
originally designed
to store all code modifications of a refactoring operation - well, now 
it also stores
entries of preprocessing operations. These can be used to calculate the 
source positions
in original code and that's it !! Well I have also implemented a 
detection of conflics of
doing refactorings to positions where macro replacement has been 
executed. Currently
the refactoring engine simply stops the refactoring -> later we can 
think about strategies,
like removing the macro and use the replacement text in this case. Or 
even we can try to
modify the macro definition, but that are some gimmicks I believe.

This preprocessing integration was not integrated into the part where 
the new CodeWriter has been
used - I want to check this next.

Until later,
André