Sam707, now I see parser. Sounds good but need to build new one more complex. XBase macros are not limited to base math functions like sin(), cos() .... With xBase macros you can use any function into the expression, including your owned functions. All this using it as natural way, only need few code for possible errors. Possibly you understand now what I want to make. :-)
Bylaardt, your link returns to forum index.
Need to take time to see and try all source code, and think how to planning implementing this in FreePascal. Time that don't have because am searching for work. But ... with time ... :-)