/**
* Parse the user's query and transform it into an SQL fragment which will
* become part of a WHERE clause
*
* @return string
*/
function parseQuery($filteredText, $fulltext)
{
global $wgContLang;
$lc = SearchEngine::legalSearchChars();
// Minus format chars
$searchon = '';
$this->searchTerms = array();
$m = array();
if (preg_match_all('/([-+<>~]?)(([' . $lc . ']+)(\\*?)|"[^"]*")/', $filteredText, $m, PREG_SET_ORDER)) {
foreach ($m as $bits) {
@(list(, $modifier, $term, $nonQuoted, $wildcard) = $bits);
if ($nonQuoted != '') {
$term = $nonQuoted;
$quote = '';
} else {
$term = str_replace('"', '', $term);
$quote = '"';
}
if ($searchon !== '') {
$searchon .= ' ';
}
// Some languages such as Serbian store the input form in the search index,
// so we may need to search for matches in multiple writing system variants.
$convertedVariants = $wgContLang->autoConvertToAllVariants($term);
if (is_array($convertedVariants)) {
$variants = array_unique(array_values($convertedVariants));
} else {
$variants = array($term);
}
// The low-level search index does some processing on input to work
// around problems with minimum lengths and encoding in MySQL's
// fulltext engine.
// For Chinese this also inserts spaces between adjacent Han characters.
$strippedVariants = array_map(array($wgContLang, 'normalizeForSearch'), $variants);
// Some languages such as Chinese force all variants to a canonical
// form when stripping to the low-level search index, so to be sure
// let's check our variants list for unique items after stripping.
$strippedVariants = array_unique($strippedVariants);
$searchon .= $modifier;
if (count($strippedVariants) > 1) {
$searchon .= '(';
}
foreach ($strippedVariants as $stripped) {
if ($nonQuoted && strpos($stripped, ' ') !== false) {
// Hack for Chinese: we need to toss in quotes for
// multiple-character phrases since normalizeForSearch()
// added spaces between them to make word breaks.
$stripped = '"' . trim($stripped) . '"';
}
$searchon .= "{$quote}{$stripped}{$quote}{$wildcard} ";
}
if (count($strippedVariants) > 1) {
$searchon .= ')';
}
// Match individual terms or quoted phrase in result highlighting...
// Note that variants will be introduced in a later stage for highlighting!
$regexp = $this->regexTerm($term, $wildcard);
$this->searchTerms[] = $regexp;
}
} else {
wfDebug(__METHOD__ . ": Can't understand search query '{$filteredText}'\n");
}
$searchon = $this->db->strencode($searchon);
$field = $this->getIndexField($fulltext);
return " {$field} MATCH '{$searchon}' ";
}
