Function parseWhile

src/parser/syntaxes/statements.ts:481–499

* ```abnf * Loop = "while" Expr BlockOrStatement * ```

(s: ITokenStream)

 * ```
*/
function parseWhile(s: ITokenStream): Ast.Loop {
	const startPos = s.getPos();
	s.expect(TokenKind.WhileKeyword);
	s.next();
	const cond = parseExpr(s, false);
	const condEndPos = s.getPos();
	const body = parseBlockOrStatement(s);

	return NODE('loop', {
		statements: [
			NODE('if', {
				cond: NODE('not', { expr: cond }, startPos, condEndPos),
				then: NODE('break', {}, condEndPos, condEndPos),
				elseif: [],
			}, startPos, condEndPos),
			body,
		],
	}, startPos, s.getPos());
}

/**
 * ```abnf