/**
* Parse the ternary operator.
*
* @param Node $node The expression node.
* @param int $precedence The precedence level.
* @return Node The ternary operator node or the given expression node.
* @throws SyntaxErrorException if no ternary else can be found after a ternary if.
*/
private function parseTernary(Node $node, $precedence)
{
/* @var Token $token */
while (($token = $this->stream->current()) && $this->operatorTable->isTernary($token)) {
$operator = $this->operatorTable->getTernaryOperator($token);
if ($operator->getIfCode() != $token->getCode() || $operator->getPrecedence() < $precedence) {
break;
}
$operatorNode = $operator->getNode();
$subPrecedence = $operator->isRightAssociative() ? $operator->getPrecedence() : $operator->getPrecedence() + 1;
// Parse the if expression
if ($operator->isShorthandAllowed() && $this->stream->getLookaheadCode() == $operator->getElseCode()) {
$this->stream->next();
$if = null;
} else {
$this->stream->next();
$if = $this->parseExpression($subPrecedence);
}
// Parse the else expression
$this->stream->expect([$operator->getElseCode()], function (Token $current = null) {
if ($current) {
$near = substr($this->stream->getSource(), 0, $current->getOffset());
$message = "Ternary else expected; got `{$current->getValue()}`; near: " . $near;
} else {
$near = substr($this->stream->getSource(), 0, strlen($this->stream->getSource()));
$message = "Ternary else expected but end of stream reached; near: " . $near;
}
throw new SyntaxErrorException($message);
});
$this->stream->next();
$else = $this->parseExpression($subPrecedence);
// Create the ternary operator node
$node = $operatorNode($node, $if, $else);
}
return $node;
}
/**
* Test if the `getTernaryOperator` method throws an exception if the requested operator doesn't exists.
*
* @expectedException \com\mohiva\pyramid\exceptions\UnsupportedOperatorException
*/
public function testGetTernaryOperatorThrowsException()
{
$token = new Token(1, '?', 1);
$table = new OperatorTable();
$table->getTernaryOperator($token);
}
