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Tiny BASIC Grammar

line ::= number statement CR   
	   | statement CR  

statement ::= PRINT expr_list
			| IF expression relop expression THEN statement  
			| GOTO expression  
			| INPUT var_list  
			| LET var = expression  
			| GOSUB expression  
			| RETURN  
			| CLEAR
			| LIST  
			| RUN  
			| END  

expr_list ::= (string|expression) (, (string|expression) )*  

var_list ::= var (, var)*  

expression ::= (+|-|ε) term ((+|-) term)*
	  
term ::= factor ((*|/) factor)*
		   
factor ::= var | number | (expression)
				
var ::= A | B | C ... | Y | Z
					 
number ::= digit digit*
					  
digit ::= 0 | 1 | 2 | 3 | ... | 8 | 9
							   
relop ::= < (>|=|ε) | > (<|=|ε) | =