Function parseEach

src/parser/syntaxes/statements.ts:244–281

* ```abnf * Each = "each" "(" "let" Dest "," Expr ")" BlockOrStatement * / "each" "let" Dest "," Expr BlockOrStatement * ```

(s: ITokenStream)

 * ```
*/
function parseEach(s: ITokenStream): Ast.Each {
	const startPos = s.getPos();
	let hasParen = false;

	s.expect(TokenKind.EachKeyword);
	s.next();

	if (s.is(TokenKind.OpenParen)) {
		hasParen = true;
		s.next();
	}

	s.expect(TokenKind.LetKeyword);
	s.next();

	const dest = parseDest(s);

	if (s.is(TokenKind.Comma)) {
		s.next();
	} else {
		throw new AiScriptSyntaxError('separator expected', s.getPos());
	}

	const items = parseExpr(s, false);

	if (hasParen) {
		s.expect(TokenKind.CloseParen);
		s.next();
	}

	const body = parseBlockOrStatement(s);

	return NODE('each', {
		var: dest,
		items: items,
		for: body,
	}, startPos, s.getPos());
}

/**
 * ```abnf