/**
* singleton
*
* @return WUMThreeWayBasedMerger
*/
public static function getInstance()
{
if (self::$instance == null) {
self::$instance = new self();
}
return self::$instance;
}
/**
* This method appends a pretty printed version of a patch fault to the corresponding section
*
* @param unknown_type $text
* @param unknown_type $patches
* @return unknown_type
*/
private function appendPatchesToSections($text, $patches)
{
global $wgParser;
foreach ($patches as $patch) {
if ($patch->section == -1) {
$patchText = WUMThreeWayBasedMerger::getInstance()->getPatchText($patch);
$patchText = str_replace("=", "//--\\", $patchText);
$text .= "\n\n" . $patchText;
} else {
$sectionText = $wgParser->getSection($text, $patch->section);
$patchText = WUMThreeWayBasedMerger::getInstance()->getPatchText($patch);
$patchText = str_replace("=", "//--\\", $patchText);
$sectionText .= "\n\n" . $patchText;
$text = $wgParser->replaceSection($text, $patch->section, $sectionText);
}
}
return $text;
}
/**
* This method is indirectly called by WP if one edits
* an article in the WP clone. It starts and controls the
* merge process and returns its result.
*
* @param $title
* @param $newWPText
* @param $currentUPText
* @return unknown_type
*/
public function merge($title, $newWPText, $currentUPText)
{
wfProfileIn('WUMMergeController->merge');
if ($this->checkIgnoreNewWPVersion($currentUPText)) {
return $currentUPText;
}
$overwrite = $this->checkOverwriteUPVersion($newWPText);
if ($overwrite !== false) {
return $overwrite;
}
//get the last WP version
$originalWPText = $this->getOriginalWPText($title);
$newWPText = $this->prepareText($newWPText);
$originalWPText = $this->prepareText($originalWPText);
$currentUPText = $this->prepareText($currentUPText);
if (strlen($originalWPText) == 0) {
return $newWPText . "\n" . $currentUPText;
}
//check whether to use the table based merger
global $wumUseTableBasedMerger;
if ($wumUseTableBasedMerger) {
$tbm = WUMTableBasedMerger::getInstance();
list($newWPText, $currentUPText, $originalWPText) = $tbm->merge($title, $newWPText, $currentUPText, $originalWPText);
//wfProfileOut('WUMMergeController->merge');
//return $currentUPText;
}
//do three way merge
$twmResult = WUMThreeWayBasedMerger::getInstance()->merge($originalWPText, $newWPText, $currentUPText);
//do section based merge if merge faults occured during three way merge
if (count($twmResult['mergeFaults']) == 0) {
$text = $twmResult['mergedText'];
} else {
$text = WUMSectionBasedMerger::getInstance()->merge($originalWPText, $newWPText, $currentUPText, $twmResult['mergedText'], $twmResult['mergeFaults']);
}
//finalize merge result, i.e. replace temporary characters
$text = WUMThreeWayBasedMerger::getInstance()->finalizeMergeResult($text);
wfProfileOut('WUMMergeController->merge');
return $text;
}
/**
* helper method for the patch_apply method
*
* @param unknown_type $text
* @param unknown_type $patch
* @param unknown_type $offset
* @return unknown_type
*/
function patch_DoApply($text, $patch, $offset)
{
$match_distance = $this->Match_Distance;
$start = $patch->start1 - $match_distance + $offset;
if ($start < 0) {
$start = 0;
}
$end = $patch->start1 + $patch->length1 + $match_distance + $offset;
if ($end > strlen($text)) {
$end = strlen($text);
}
$subText = substr($text, $start, $end - $start);
$pattern = "";
for ($i = 0; $i < count($patch->diffs); $i++) {
if ($patch->diffs[$i][0] == DIFF_EQUAL || $patch->diffs[$i][0] == DIFF_DELETE) {
$pattern .= $patch->diffs[$i][1];
}
}
$startSubString = strpos($subText, $pattern);
if ($startSubString != strrpos($subText, $pattern) || $startSubString === false) {
//no exact match
return array(0 => $text, 1 => false);
}
$replacement = "";
for ($i = 0; $i < count($patch->diffs); $i++) {
if ($patch->diffs[$i][0] == DIFF_EQUAL || $patch->diffs[$i][0] == DIFF_INSERT) {
$replacement .= $patch->diffs[$i][1];
}
}
$patchText = WUMThreeWayBasedMerger::getInstance()->getPatchText($patch);
$replacement = str_replace($patchText, str_replace("=", "//--\\", $patchText), $replacement);
$text = substr($text, 0, $start + $startSubString) . $replacement . substr($text, $start + $startSubString + $patch->length1);
return array(0 => $text, 1 => true);
}
