CODE:

%token_type {int}


%left Num_literal_token.
%left Variable_token.
%left Binary_operator.


%include {

#include 
#include 
#include 
#include 

}


program ::= input.


input   ::= /* empty */.	{ printf("bison info : found input\n"); }
input	::= input line.		{ printf("bison info : found input\n"); }



line	::= formula Semicolon.		{ printf("bison info : found line\n"); }
line	::= Semicolon.				{ printf("bison info : found line\n"); }
line	::= error Semicolon.		{ printf("bison error : wrong formula\n"); }


formula	::= Variable_token Equal formula.		{ printf("bison info : found formula\n"); }
formula	::= Num_literal_token Equal formula.	{ printf("bison error : left-hand side must variable\n"); }
formula	::= formula Binary_operator formula.	{ printf("bison info : found formula\n"); }
formula	::= Variable_token.						{ printf("bison info : found formula\n"); }
formula	::= Num_literal_token.					{ printf("bison info : found formula\n"); }

CODE:

#define Num_literal_token                1
#define Variable_token                   2
#define Binary_operator                  3
#define Semicolon                        4
#define Equal                            5

CODE:

/* Driver template for the LEMON parser generator.
** The author disclaims copyright to this source code.
*/
/* First off, code is included that follows the "include" declaration
** in the input grammar file. */
#include 
#line 9 "basic_lemon.y"


#include 
#include 
#include 

#line 15 "basic_lemon.c"
/* Next is all token values, in a form suitable for use by makeheaders.
** This section will be null unless lemon is run with the -m switch.
*/

CODE:

      ** three input tokens have been successfully shifted.
      */
      if( yypParser->yyerrcntyyerrcnt = 3;
      yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
      if( yyendofinput ){
        yy_parse_failed(yypParser);
      }
      yymajor = YYNOCODE;
#endif
    }
  }while( yymajor!=YYNOCODE && yypParser->yyidx>=0 );
  return;
}

CODE:

/* Driver template for the LEMON parser generator.
** The author disclaims copyright to this source code.
*/
/* First off, code is included that follows the "include" declaration
** in the input grammar file. */
#include 
#line 9 "basic_lemon.y"


#include 
#include 
#include 
#include 
#include 
#include "basic_lemon.h"

#line 15 "basic_lemon.c"
/* Next is all token values, in a form suitable for use by makeheaders.
** This section will be null unless lemon is run with the -m switch.
*/

CODE:

			** As before, subsequent error messages are suppressed until
			** three input tokens have been successfully shifted.
			*/
			if (yypParser->yyerrcnt yyerrcnt = 3;
			yy_destructor(yypParser, (YYCODETYPE)yymajor, &yyminorunion);
			if (yyendofinput){
				yy_parse_failed(yypParser);
			}
			yymajor = YYNOCODE;
#endif
		}
	} while (yymajor != YYNOCODE && yypParser->yyidx >= 0);
	return;
}


int main()
{
	void* pParser = ParseAlloc(malloc);

	Parse(pParser, Variable_token, 0);
	Parse(pParser, Equal, 0);
	Parse(pParser, Num_literal_token, 0);
	Parse(pParser, Semicolon, 0);
	Parse(pParser, 0, 0);

	ParseFree(pParser, free);

	getchar();

	return 0;
}