/**
* Parses the update part of a for-statement.
*
* <code>
* -------------------------------
* for ($x = 0, $y = 23, $z = 42; $x < $y; ++$x, $y = $x + 1, $z = $x + 2) {}
* -------------------------------
* </code>
*
* @return PHP_Depend_Code_ASTForUpdate
* @since 0.9.12
*/
private function parseForUpdate()
{
$this->consumeComments();
if (self::T_PARENTHESIS_CLOSE === $this->tokenizer->peek()) {
return null;
}
$this->tokenStack->push();
$update = $this->builder->buildAstForUpdate();
$this->parseExpressionList($update);
return $this->setNodePositionsAndReturn($update);
}