SimpleDeclarative.g
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	grammar SimpleDeclarative;

	function
	: WORD COLON 'function' expression(ARROW expression)? setFuncBody SEMICOLON;

	setFuncBody
	: BRACESTART BRACEEND \| BRACESTART expression ARROW expression (COMMA expression ARROW expression)* BRACEEND;
	;


	set : BRACESTART BRACEEND \| '{' set_member (COMMA set_member)* BRACEEND;
	set_member: (atom COLON)=> atom COLON expression (OR expression)* \| (expression EQUAL)=> equation \| expression;


	expression
	: (LET set)? (atom \| set) (WHERE set)?;

	equation : expression EQUAL expression;

	atom : WORD \| NUMBER;

	WHERE : 'where';
	LET : 'let';
	EQUAL : '=';
	SEMICOLON: ';';
	OR : '\|';
	COLON : ':';
	ARROW : '->';
	BRACESTART : '{';
	BRACEEND : '}';
	COMMA : ',';
	NUMBER : (DIGIT)+ ;
	WORD : (LETTER)+;

	fragment
	DIGIT : '0'..'9' ;

	fragment
	LETTER : 'a'..'z';

	WHITESPACE : ( '\t' \| ' ' \| '\r' \| '\n'\| '\u000C' )+ { $channel = HIDDEN; } ;