/**
* Index a block of text for an object.
* @param $objectId int
* @param $text string
* @param $position int
*/
function indexObjectKeywords($objectId, $text, &$position)
{
$searchDao =& DAORegistry::getDAO('PaperSearchDAO');
$keywords =& PaperSearchIndex::filterKeywords($text);
for ($i = 0, $count = count($keywords); $i < $count; $i++) {
if ($searchDao->insertObjectKeyword($objectId, $keywords[$i], $position) !== null) {
$position += 1;
}
}
}
/**
* Query parsing helper routine.
* Returned structure is based on that used by the Search::QueryParser Perl module.
*/
function _parseQuery($signTokens, $tokens, &$pos, $total)
{
$return = array('+' => array(), '' => array(), '-' => array());
$postBool = $preBool = '';
$notOperator = String::strtolower(__('search.operator.not'));
$andOperator = String::strtolower(__('search.operator.and'));
$orOperator = String::strtolower(__('search.operator.or'));
while ($pos < $total) {
if (!empty($signTokens[$pos])) {
$sign = $signTokens[$pos];
} else {
if (empty($sign)) {
$sign = '+';
}
}
$token = String::strtolower($tokens[$pos++]);
switch ($token) {
case $notOperator:
$sign = '-';
break;
case ')':
return $return;
case '(':
$token = PaperSearch::_parseQuery($signTokens, $tokens, $pos, $total);
default:
$postBool = '';
if ($pos < $total) {
$peek = String::strtolower($tokens[$pos]);
if ($peek == $orOperator) {
$postBool = 'or';
$pos++;
} else {
if ($peek == $andOperator) {
$postBool = 'and';
$pos++;
}
}
}
$bool = empty($postBool) ? $preBool : $postBool;
$preBool = $postBool;
if ($bool == 'or') {
$sign = '';
}
if (is_array($token)) {
$k = $token;
} else {
$k = PaperSearchIndex::filterKeywords($token, true);
}
if (!empty($k)) {
$return[$sign][] = $k;
}
$sign = '';
break;
}
}
return $return;
}