/**
* Read expand or select clause.
*
* @param string $value expand or select clause to read.
* @param boolean $isSelect true means $value is value of select clause
* else value of expand clause.
*
* @return array(array) An array of 'PathSegment's, each of which is array
* of 'SubPathSegment's
*/
private function _readExpandOrSelect($value, $isSelect)
{
$pathSegments = array();
$lexer = new ExpressionLexer($value);
$i = 0;
while ($lexer->getCurrentToken()->Id != ExpressionTokenId::END) {
$lastSegment = false;
if ($isSelect && $lexer->getCurrentToken()->Id == ExpressionTokenId::STAR) {
$lastSegment = true;
$subPathSegment = $lexer->getCurrentToken()->Text;
$lexer->nextToken();
} else {
$subPathSegment = $lexer->readDottedIdentifier();
}
if (!array_key_exists($i, $pathSegments)) {
$pathSegments[$i] = array();
}
$pathSegments[$i][] = $subPathSegment;
$tokenId = $lexer->getCurrentToken()->Id;
if ($tokenId != ExpressionTokenId::END) {
if ($lastSegment || $tokenId != ExpressionTokenId::SLASH) {
$lexer->validateToken(ExpressionTokenId::COMMA);
$i++;
}
$lexer->nextToken();
}
}
return $pathSegments;
}
/**
* Read orderby clause.
*
* @param string $value orderby clause to read.
*
* @return array(array) An array of 'OrderByPathSegment's, each of which
* is array of 'OrderBySubPathSegment's
*
* @throws ODataException If any syntax error found while reading the clause
*/
private function _readOrderBy($value)
{
$orderByPathSegments = array();
$lexer = new ExpressionLexer($value);
$i = 0;
while ($lexer->getCurrentToken()->Id != ExpressionTokenId::END) {
$orderBySubPathSegment = $lexer->readDottedIdentifier();
if (!array_key_exists($i, $orderByPathSegments)) {
$orderByPathSegments[$i] = array();
}
$orderByPathSegments[$i][] = $orderBySubPathSegment;
$tokenId = $lexer->getCurrentToken()->Id;
if ($tokenId != ExpressionTokenId::END) {
if ($tokenId != ExpressionTokenId::SLASH) {
if ($tokenId != ExpressionTokenId::COMMA) {
$lexer->validateToken(ExpressionTokenId::IDENTIFIER);
$identifier = $lexer->getCurrentToken()->Text;
if ($identifier !== 'asc' && $identifier !== 'desc') {
// force lexer to throw syntax error as we found
// unexpected identifier
$lexer->validateToken(ExpressionTokenId::DOT);
}
$orderByPathSegments[$i][] = '*' . $identifier;
$lexer->nextToken();
$tokenId = $lexer->getCurrentToken()->Id;
if ($tokenId != ExpressionTokenId::END) {
$lexer->validateToken(ExpressionTokenId::COMMA);
$i++;
}
} else {
$i++;
}
}
$lexer->nextToken();
}
}
return $orderByPathSegments;
}
