Exchange parameter, How?

Hi!


We have a special language.
This is the function declaration:


function_declaration: function_name
                                              '('
                                     parameters
')'


parameters:
| parameters ',' one_parameter
| one_parameter
;


...


So this language is simular to C. A function is like:
function(a,b,c,d);


We want to write a program, which can exchange the parameters for us.
that is: function(b,a,d,c);


We are going to use LEX and YACC to do this. But we don't have the complete
grammar from this language. Is there a simple way to do this using lex & yacc
without to write the whole grammar?


Thanks very much!
Alexander Dong
qiwen@rbg.informatik.th-darmstadt.de
[You can probably do well enough by just fiddling things that look like
function calls, looking lexically for a name followed by an open paren.
-John]
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