/**
* Parse primary expression.
*
* @return Node The primary node.
* @throws SyntaxErrorException if no operand or unary operator can be found.
*/
private function parsePrimary()
{
/* @var Token $token */
$token = $this->stream->current();
if ($token && $this->operatorTable->isUnary($token)) {
$this->stream->next();
$operator = $this->operatorTable->getUnaryOperator($token);
$operatorNode = $operator->getNode();
$node = $operatorNode($this->parseExpression($operator->getPrecedence()));
} else {
if ($token) {
$node = $this->parseOperand();
$this->stream->next();
} else {
throw new SyntaxErrorException('Operand or unary operator expected; but end of stream reached');
}
}
return $node;
}
/**
* Test if the `getUnaryOperator` method throws an exception if the requested operator doesn't exists.
*
* @expectedException \com\mohiva\pyramid\exceptions\UnsupportedOperatorException
*/
public function testGetUnaryOperatorThrowsException()
{
$token = new Token(1, '+', 1);
$table = new OperatorTable();
$table->getUnaryOperator($token);
}
