Object Oriented YACC (OOYACC)

OOYacc is an Object Oriented version of standard Berkeley Yacc v1.9.
 

Advantages over other Yacc's (Bison etc)

• A Complete object oriented Parser.
• Parser can have as many instances. All of them can run concurrently.
• The parser stack is a private member of the Parser instance.
• Each parser is reenterent. One can abort from the parser and can resume from the previous state.
• Is very usefull in concurrent or parallel text parsing using the same grammer.

Differences  over  berkeley  Yacc

• Always generate the header file y.tab.h.  The switch -d  is not  valid.
• The  yacc stack YYSTYPE  is a private data type of the parser class.
• It generates a parser class named  yyParser.
• The function YYSTYPE* getLVal()  is used to retrieve the  yacc stack.

Using  the OOYACC

The Header File format and usage

typedef union{
....
....
} YYSTYPE; // redefine YYSTYPE if using multiple grammars
class <symbol prefix>Parser{   //  The default symbol prefix is yy. User defined prefixes
                               //  are useful when having more than one
                               //  parser class.
  private:
    int yydebug;
    int yynerrs;
    int yyerrflag;
    int yychar;
    short *yyssp;
    YYSTYPE *yyvsp;
    YYSTYPE yyval;
    YYSTYPE yylval;
    short yyss[YYSTACKSIZE];
    YYSTYPE yyvs[YYSTACKSIZE];
    int yym,yyn,yystate;
    char* yys;
  public:
    yyParser();            // default constructor of the parser.
    int yyparse();         // the parser function
    YYSTYPE* getLVal();    // function to retrieve the top of parser stack
};

DownLoad OOYACC executable

• SOLARIS 2.5.1
• HPUX 9.01

DownLoad OOYACC source code

• OOYACC.ZIP

You are visitor No since 16th April 1998