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<?php
/**
* TTMServer - The Translate extension translation memory interface
*
* @file
* @author Niklas Laxström
* @copyright Copyright © 2012-2013, Niklas Laxström
* @license GPL-2.0+
* @defgroup TTMServer The Translate extension translation memory interface
*/
/**
* Some general static methods for instantiating TTMServer and helpers.
* @since 2012-01-28
* Rewritten in 2012-06-27.
* @ingroup TTMServer
*/
class TTMServer {
protected $config;
protected function __construct( $config ) {
$this->config = $config;
}
public static function factory( $config ) {
if ( isset( $config['class'] ) ) {
$class = $config['class'];
return new $class( $config );
} elseif ( isset( $config['type'] ) ) {
$type = $config['type'];
switch ( $type ) {
case 'ttmserver':
return new DatabaseTTMServer( $config );
case 'remote-ttmserver':
return new RemoteTTMServer( $config );
default:
return null;
}
}
throw new MWEXception( 'TTMServer with no type' );
}
/**
* Returns the primary server instance, useful for chaining.
* Primary one is defined as config with key TTMServer
* in $wgTranslateTranslationServices.
* @return WritableTTMServer
*/
public static function primary() {
global $wgTranslateTranslationServices;
if ( isset( $wgTranslateTranslationServices['TTMServer'] ) ) {
$obj = self::factory( $wgTranslateTranslationServices['TTMServer'] );
if ( $obj instanceof WritableTTMServer ) {
return $obj;
}
}
return new FakeTTMServer();
}
public static function sortSuggestions( array $suggestions ) {
usort( $suggestions, array( __CLASS__, 'qualitySort' ) );
return $suggestions;
}
protected static function qualitySort( $a, $b ) {
list( $c, $d ) = array( $a['quality'], $b['quality'] );
if ( $c === $d ) {
return 0;
}
// Descending sort
return ( $c > $d ) ? -1 : 1;
}
/**
* PHP implementation of Levenshtein edit distance algorithm.
* Uses the native PHP implementation when possible for speed.
* The native levenshtein is limited to 255 bytes.
*
* @param string $str1
* @param string $str2
* @param int $length1
* @param int $length2
* @return int
*/
public static function levenshtein( $str1, $str2, $length1, $length2 ) {
if ( $length1 === 0 ) {
return $length2;
}
if ( $length2 === 0 ) {
return $length1;
}
if ( $str1 === $str2 ) {
return 0;
}
$bytelength1 = strlen( $str1 );
$bytelength2 = strlen( $str2 );
if ( $bytelength1 === $length1 && $bytelength1 <= 255
&& $bytelength2 === $length2 && $bytelength2 <= 255
) {
return levenshtein( $str1, $str2 );
}
$prevRow = range( 0, $length2 );
for ( $i = 0; $i < $length1; $i++ ) {
$currentRow = array();
$currentRow[0] = $i + 1;
$c1 = mb_substr( $str1, $i, 1 );
for ( $j = 0; $j < $length2; $j++ ) {
$c2 = mb_substr( $str2, $j, 1 );
$insertions = $prevRow[$j + 1] + 1;
$deletions = $currentRow[$j] + 1;
$substitutions = $prevRow[$j] + ( ( $c1 !== $c2 ) ? 1 : 0 );
$currentRow[] = min( $insertions, $deletions, $substitutions );
}
$prevRow = $currentRow;
}
return $prevRow[$length2];
}
/// Hook: ArticleDeleteComplete
public static function onDelete( WikiPage $wikipage ) {
$handle = new MessageHandle( $wikipage->getTitle() );
TTMServer::primary()->update( $handle, null );
return true;
}
/// Called from TranslateEditAddons::onSave
public static function onChange( MessageHandle $handle, $text, $fuzzy ) {
if ( $fuzzy ) {
$text = null;
}
TTMServer::primary()->update( $handle, $text );
}
public static function onGroupChange( MessageHandle $handle, $old, $new ) {
if ( $old === array() ) {
// Don't bother for newly added messages
return true;
}
$job = TTMServerMessageUpdateJob::newJob( $handle );
JobQueueGroup::singleton()->push( $job );
return true;
}
}
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