grammar : production
	| grammar production
	| grammar COMMENT
	;

production : lhs expressionListList TERMINATOR
	;

lhs : IDENT SEPARATOR
	;

expressionListList : expressionList
	| expressionListList OR expressionList
	;

expressionList :
	| expressionList expression
	;

expression : base
	| base OPT
	| base STAR
	| base PLUS
	| COMMENT
	;

base : LITERAL
	| IDENT
	| LPAREN expressionList RPAREN
	| LPAREN alternation RPAREN
	;

alternation : expression OR expression
	| alternation OR expression
	;