push simulation

[Fiordean Dacian]

 

Hi all,

 

I've saw for a parser generator tool named Visual Parse++ (an old version) the possibility to push and pop from the stack using a command whithin a production. Is there any possibility to simulate this with Bizon?

 

Here is an example:

 

(a|A)(c|C)(t|T)(i|I)(o|O)(n|N)            ..., %push ExpAction

 

%_expression_ ExpAction

[^;]+                ...., %pop

 

What I need is in fact to parse a production like this

 

=========lex==========

 

(a|A)(c|C)(t|T)(i|I)(o|O)(n|N)        { return TK_ACTION; }

 

...

 

[^;]+    {...

            return TK_STRING;

            }

 

======Bizon===========

 

action : TK_ACTION string end

            {

                ......

            }

        ;

 

string : TK_STRING;

         ;

 

 

...But the problem with this lexer is that the last regular expresion ( [^;] ) eats all.

 

Example:

    action extern 'dnbbsdnsdbdsn hsgs ssqhsq    '  xyz;

 

is eated by this _expression_. I need action to be eated by the first and only the rest to be eated by the last _expression_.

 

So I need a way when the parser reduces the action production to eat all the text follwed by this and which matches the lexer's last _expression_. Then the _expression_ must be poped and modelated for my needs.

I've saw the conditional states but I don't know if are a solution and how to access them from parser.

 

Thx,

// D.