/**
* Parses order conditions of a query.
*
* @return void
* @throws SparqlParserException
*/
protected function parseOrderCondition()
{
$valList = array();
$val = array();
while (strtolower(current($this->tokens)) != 'limit' & strtolower(current($this->tokens)) != false & strtolower(current($this->tokens)) != 'offset') {
switch (strtolower(current($this->tokens))) {
case "desc":
$this->_fastForward();
$this->_fastForward();
if ($this->varCheck(current($this->tokens))) {
$val['val'] = current($this->tokens);
} else {
throw new SparqlParserException("Variable expected in ORDER BY clause. ", null, key($this->tokens));
}
$this->_fastForward();
if (current($this->tokens) != ')') {
throw new SparqlParserException("missing ')' in ORDER BY clause.", null, key($this->tokens));
}
$val['type'] = 'desc';
$this->_fastForward();
break;
case "asc":
$this->_fastForward();
$this->_fastForward();
if ($this->varCheck(current($this->tokens))) {
$val['val'] = current($this->tokens);
} else {
throw new SparqlParserException("Variable expected in ORDER BY clause. ", null, key($this->tokens));
}
$this->_fastForward();
if (current($this->tokens) != ')') {
throw new SparqlParserException("missing ')' in ORDER BY clause.", null, key($this->tokens));
}
$val['type'] = 'asc';
$this->_fastForward();
break;
default:
if ($this->varCheck(current($this->tokens))) {
$val['val'] = current($this->tokens);
$val['type'] = 'asc';
} else {
throw new SparqlParserException("Variable expected in ORDER BY clause. ", null, key($this->tokens));
}
$this->_fastForward();
break;
}
$valList[] = $val;
}
prev($this->tokens);
$this->query->setSolutionModifier('order by', $valList);
}
