C++ try/catch

[Hans Yperman]

I want to have a C++  try/catch block around every rule in a bison
script.  Right now, I do:

begin: realbegin|invalid_last_rule{
        ; //this the actual rule
        //REMOVED_BY_SCRIPT }//end of this rule
        //REMOVED_BY_SCRIPT }//end of switch(yyn)
        //REMOVED_BY_SCRIPT try { switch(yyn){
        //REMOVED_BY_SCRIPT case -12345678: { UNREACHABLE();
        }

realbegin:

all the rules

// This is the very last rule.  No more rules after this !!!
invalid_last_rule: "$$CANTPARSEME" {
        
        //This rule is never parsed. See the begin rule why
        //REMOVED_BY_SCRIPT} //end of this rule
        //REMOVED_BY_SCRIPT} //end of switch(yyn)
        //REMOVED_BY_SCRIPT} //end of try block
        catch(BaseException& e){
          yyerror(&e.getPosition(),pinfo,e.getMessage());

        }
        switch(0)
        //REMOVED_BY_SCRIPT {
        default:
        //REMOVED_BY_SCRIPT {
        ;

A script then removes  the text "//REMOVED_BY_SCRIPT" from the bison
parser, leaving some extra }'s and {'s in the code

This method works, but is extremely ugly.  Does someone have a better idea?

I can't use the C++ parsers, as I want the code to work on both past
and future versions of bison.

Thanks in advance

Hans