/**
* @param IdentifierNode $astNode
* @return bool
* @throws \DomainException
*/
public function visitIdentifierNode(IdentifierNode $astNode)
{
$name = $astNode->getIdentifierName();
$uppercase = strtoupper($name);
if ($uppercase == $name) {
$expression = new ExpressionSymbol(Symbol::TYPE_TERMINAL, $name);
$this->visitContext->pushExpression($expression);
return true;
}
$lowercase = strtolower($name);
if ($lowercase == $name) {
$expression = new ExpressionSymbol(Symbol::TYPE_NON_TERMINAL, $name);
$this->visitContext->pushExpression($expression);
return true;
}
throw new \DomainException('unknown type of identifier name');
}
/**
* @param IdentifierNode $astNode
* @return string
*/
protected function buildDOTIdentifier(IdentifierNode $astNode)
{
$idNumber = $this->visitContext->getNodeCount();
$identifierName = $astNode->getIdentifierName();
return sprintf('"%s[%s]"', $identifierName, $idNumber);
}