/**
* Parses a String to an RDF node.
*
* @param String $node
*
* @return Node The parsed RDF node
* @throws SparqlParserException
*/
protected function parseNode($node = false)
{
//$eon = false;
if ($node) {
$node = $node;
} else {
$node = current($this->tokens);
}
if ($node[strlen($node) - 1] == '.') {
$node = substr($node, 0, -1);
}
if ($this->dtypeCheck($node)) {
return $node;
}
if ($this->bNodeCheck($node)) {
$node = '?' . $node;
$this->query->addUsedVar($node);
return $node;
}
if ($node == '[') {
$node = '?' . substr($this->query->getBlanknodeLabel(), 1);
$this->query->addUsedVar($node);
$this->_fastForward();
if (current($this->tokens) != ']') {
prev($this->tokens);
}
return $node;
}
if ($this->iriCheck($node)) {
$base = $this->query->getBase();
if ($base != null) {
$node = new Resource(substr(substr($base, 0, -1) . substr($node, 1), 1, -1));
} else {
$node = new Resource(substr($node, 1, -1));
}
return $node;
} else {
if ($this->qnameCheck($node)) {
$node = $this->query->getFullUri($node);
$node = new Resource($node);
return $node;
} else {
if ($this->literalCheck($node)) {
$ch = substr($node, 0, 1);
$chLong = str_repeat($ch, 3);
if (substr($node, 0, 3) == $chLong) {
$ch = $chLong;
}
$this->parseLiteral($node, $ch);
} else {
if ($this->varCheck($node)) {
$pos = strpos($node, '.');
if ($pos) {
return substr($node, 0, $pos);
} else {
return $node;
}
} else {
if ($node[0] == '<') {
//partial IRI? loop tokens until we find a closing >
while (next($this->tokens)) {
$node .= current($this->tokens);
if (substr($node, -1) == '>') {
break;
}
}
if (substr($node, -1) != '>') {
throw new SparqlParserException("Unclosed IRI: " . $node, null, key($this->tokens));
}
return $this->parseNode($node);
} else {
throw new SparqlParserException('"' . $node . '" is neither a valid rdf- node nor a variable.', null, key($this->tokens));
}
}
}
}
}
return $node;
}
