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PhabricatorSearchNgrams.php
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Created
Wed, Feb 5, 22:24

PhabricatorSearchNgrams.php
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<?php
abstract class PhabricatorSearchNgrams
extends PhabricatorSearchDAO {
protected $objectID;
protected $ngram;
private $value;
abstract public function getNgramKey();
abstract public function getColumnName();
final public function setValue($value) {
$this->value = $value;
return $this;
}
final public function getValue() {
return $this->value;
}
protected function getConfiguration() {
return array(
self::CONFIG_TIMESTAMPS => false,
self::CONFIG_COLUMN_SCHEMA => array(
'objectID' => 'uint32',
'ngram' => 'char3',
),
self::CONFIG_KEY_SCHEMA => array(
'key_ngram' => array(
'columns' => array('ngram', 'objectID'),
),
'key_object' => array(
'columns' => array('objectID'),
),
),
) + parent::getConfiguration();
}
public function getTableName() {
$application = $this->getApplicationName();
$key = $this->getNgramKey();
return "{$application}_{$key}_ngrams";
}
final public function tokenizeString($value) {
$value = trim($value, ' ');
$value = preg_split('/ +/', $value);
return $value;
}
final public function getNgramsFromString($value, $mode) {
$tokens = $this->tokenizeString($value);
$ngrams = array();
foreach ($tokens as $token) {
$token = phutil_utf8_strtolower($token);
switch ($mode) {
case 'query':
break;
case 'index':
$token = ' '.$token.' ';
break;
case 'prefix':
$token = ' '.$token;
break;
}
$len = (strlen($token) - 2);
for ($ii = 0; $ii < $len; $ii++) {
$ngram = substr($token, $ii, 3);
$ngrams[$ngram] = $ngram;
}
}
ksort($ngrams);
return array_keys($ngrams);
}
final public function writeNgram($object_id) {
$ngrams = $this->getNgramsFromString($this->getValue(), 'index');
$conn_w = $this->establishConnection('w');
$sql = array();
foreach ($ngrams as $ngram) {
$sql[] = qsprintf(
$conn_w,
'(%d, %s)',
$object_id,
$ngram);
}
queryfx(
$conn_w,
'DELETE FROM %T WHERE objectID = %d',
$this->getTableName(),
$object_id);
if ($sql) {
queryfx(
$conn_w,
'INSERT INTO %T (objectID, ngram) VALUES %LQ',
$this->getTableName(),
$sql);
}
return $this;
}
}

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