Re: Help-bison digest, Vol 1 #187 - 5 msgs

[shri]

hi

i guess the following might help.
i guess the problem is that flex does not flush the buffer even in case of an 
error.hence the next time even if u assign a new buffer,it picks from the point 
where it had left, in the old buffer.  

u'll have to use the function yyrestart(FILE*).this function of flex destroys 
the previous buffer and sets the new buffer to the one indicated by the FILE 
pointer.


if u r using start states in ur flex code,in case of parse error u'll have to 
intialize the state to the INITIAL state by the macro BEGIN(INITIAL).

heres the pseudo code for that 

/*after error occurs */
FILE* yyin= some new file

/*integer flag to indicate new file*/
int newFile=0;
newFile++;

yyrestart(yyin);
yyparse();

/*in flex*/
%{
        
%}


%%

%{
       if(newFile)
         {
              BEGIN(INITIAL);
              newFile--;
         }

%}




%%