Input Data Stream Uprgaded Grammar

[Vladimir Rykov]

Hello to everyone!

 

I met a problem that seems unresolvable for me - surely - there are people more Bison-BNF-experienced then me..

 

I use simple GNU Bison/Flex/GCC package for Windows to make and upgrade my converter of Math expressions.

 

My problem and question to you is:

 

Is it possible to upgrade the compiled (binary) Bison-made Grammar from the input data stream?

 

Here is an example;

 

...

 

a*b+c     - ordinary data

...

 

(I want to define new operation):

 

DEFINE ** AS n**2 = n*n    - or by any other means

 

...

(Then I use this new operation in my input stream)

 

d + f ** 2

 

...

 

 

So - may I define new operation (let it be "square" - **) using properly keywords and other tools and so to upgrade my inner grammar?

 

 

 

Vladimir Rykov, PhD in Computational Linguistics,          Personal web-site: http://rykov.narod.ru/
MOCKBA, Linguistic Institute of RAS                              English version: http://www.blkbox.com/~gigawatt/rykov.html