%{
import java.io.*;

%}

%token EOLN

%%

slurpy_language :       slurpy_language slurpy
                |       slurpy
                ;
 
slurpy  :       slimp slump EOLN
        ;
 
slimp   :       'A' 'H'
        |       'A' 'B' slimp 'C'
        |       'A' slump 'C'
        ;
 
slump   :       d_or_e f_string end
        ;
 
d_or_e  :       'D'
        |       'E'
        ;
 
f_string:       f_string 'F'
        |       'F'
        ;
 
end     :       slump
        |       'G'
        ;
 
%%
/* Byacc/J expects a member method int yylex(). We need to provide one
   through this mechanism. See the jflex manual for more information. */

	/* reference to the lexer object */
	private scanner lexer;

	/* interface to the lexer */
	private int yylex() {
		int retVal = -1;
		try {
			retVal = lexer.yylex();
		} catch (IOException e) {
			System.err.println("IO Error:" + e);
		}
		return retVal;
	}
	
	/* error reporting */
	public void yyerror (String error) {
		System.err.println("Error : " + error + " at line " + lexer.getLine());
		System.err.println("String rejected");
	}

	/* constructor taking in File Input */
	public Parser (Reader r) {
		lexer = new scanner (r, this);
	}

	public static void main (String [] args) throws IOException {
		Parser yyparser = new Parser(new FileReader(args[0]));
		yyparser.yyparse();
		System.out.println("String accepted");
	}