/home/sebastian/gpudbms/trunk/cogadb/include/sql/server/sql_driver.hpp

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#ifndef SQL_DRIVER_HPP
#define SQL_DRIVER_HPP

#include "sql/server/sql_parsetree.hpp"
#include "sql_parser.hpp"

#include <iostream>
#include <string>
#include <exception>

namespace CoGaDB {
namespace SQL {

namespace Scanner {
        typedef void *buffer;

        Parser::token_type lex(Parser::semantic_type *yylval_param,
                               type yyscanner);
}

class Driver {
        Scanner::buffer buffer;
        /* FIXME: should not be public */
public:
        std::istream *istream;
private:
        Scanner::type scanner;

        Parser parser;

        ParseTree::SequencePtr result;

public:
        class ParseError : public std::exception {
        public:
                const char *
                what() const throw()
                {
                        return "Error during parsing";
                }
        };

        Driver();
        ~Driver();

        ParseTree::SequencePtr parse(std::istream &is);
        ParseTree::SequencePtr parse(const std::string &src);

private:
        /*
         * defined in sql-scanner.lpp
         */
        void init_scan();

        void set_input(std::istream &is);
        void set_input(const std::string &src);

        void destroy_scan();

        void error(const std::string& m);

        inline void
        unsupported(void)
        {
                error("Unsupported language construct");
        }

        /*
         * Friends
         */
        friend Parser::token_type Scanner::lex(Parser::semantic_type *,
                                               Scanner::type);
        friend class Parser;
};

bool commandlineExec(const std::string &input);

} /* namespace SQL */
} /* namespace CoGaDB */

#endif