/**
* Parse the expression.
*
* @param int $precedence The precedence level.
* @return Node The expression node.
*/
private function parseExpression($precedence)
{
/* @var Token $token */
$node = $this->parsePrimary();
while (($token = $this->stream->current()) && $this->operatorTable->isBinary($token)) {
$operator = $this->operatorTable->getBinaryOperator($token);
if ($operator->getPrecedence() < $precedence) {
break;
}
$this->stream->next();
$operatorNode = $operator->getNode();
$node = $operatorNode($node, $this->parseExpression($operator->isRightAssociative() ? $operator->getPrecedence() : $operator->getPrecedence() + 1));
}
$node = $this->parseTernary($node, $precedence);
return $node;
}
/**
* Test if the `isBinary` method returns false if the given token isn't a binary operator.
*/
public function testIsBinaryReturnsFalse()
{
$operator = new UnaryOperator(1, 10, function () {
});
$token = new Token($operator->getCode(), '+', 1);
$table = new OperatorTable();
$table->addOperator($operator);
$this->assertFalse($table->isBinary($token));
}