Wow! You are fast! I have experimented a little bit with this code and
it looks very good, but there are two things which needs to be fixed
before I can use it:
* the position of a token in the original source code is
gone(default in standard Wave)
* the line positioning is incorrect/non-standard (see below for an
example).
The column information seems correct to me. But the line information
is not correct as it does not behave like a standard preprocessor
which would insert #line directives to map the positions to the
original source file(s). Example:
///BEGIN TEST.C
#include "test.h"
#define FOO int x;
int main(){
FOO; /*comment */double y;
};
//END TEST.C
//BEGIN TEST.h
class Foo{
};
//END TEST.h
You would expect the line position of 'double' in test.C line 5 to
still be 5, but instead it is 6 because
1. the line in test.C with just an "\n" in test.C does not count in
the line positioning (-1 line in position)
2. there is no separation between the lines in test.h and test.C
(+2 lines in position)
thanks
Andreas
On 11/7/06, Hartmut Kaiser
Andreas,
I need some advice regarding Wave. What I want to do is to operate with Wave on a token stream and extract the token stream representing macro calls after expansion. The twist is that I want the token stream after expansion to have the positions that another preprocessor would see on the already expanded output from Wave. E.g: #define MACRO_CALL int x; int main(){ MACRO };
Exands into #line 2 int main(){ int x; };
Where 'int x' should have a position of line 3 instead of line 1 after expansion. I also want the column number to represent what we see on line 3 instead of what we see on line 1. Is this possible ?
Ok, I've added a new pp hook (what else? :-P) to Wave:
/////////////////////////////////////////////////////////////////////////// // // The function 'generated_token' will be called by the library whenever a // token is about to be returned from the library. // // The parameter 'ctx' is a reference to the context object used for // instantiating the preprocessing iterators by the user. // // The parameter 't' is the token about to be returned from the library. // This function may alter the token, but in this case it must be // implemented with a corresponding signature: // // Token const& // generated_token(Context const& ctx, Token& t); // // which makes it possible to modify the token in place. // // The default behavior is to return the token passed as the parameter // without modification. // /////////////////////////////////////////////////////////////////////////// template
Token const& generated_token(Context const& ctx, Token const& t) { return t; } This should help solving your problem.
To show how this hook function may help you I added a new sample 'real_positions' to Wave demonstrating its use. Everything is in the Boost CVS::HEAD.
HTH Regards Hartmut
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