Use diffs if provided, otherwise compute it ourselves.
There are four ways to call this function, depending on what data is
available to the caller:
Method 1:
a = text1, b = text2
Method 2:
a = diffs
Method 3 (optimal):
a = text1, b = diffs
Method 4 (deprecated, use method 3):
a = text1, b = text2, c = diffs
|
public patch_make ( $a, $opt_b = null, $opt_c = null ) : {Array. |
||
| return | {Array. |
|
/**
* Calculate the DiffMatchPatch patch between two Phabricator files.
*
* @phutil-external-symbol class diff_match_patch
*/
public static function calculatePatch(PhabricatorFile $old = null, PhabricatorFile $new = null)
{
$root = dirname(phutil_get_library_root('phabricator'));
require_once $root . '/externals/diff_match_patch/diff_match_patch.php';
$old_hash = self::EMPTY_HASH;
$new_hash = self::EMPTY_HASH;
if ($old !== null) {
$old_hash = $old->getContentHash();
}
if ($new !== null) {
$new_hash = $new->getContentHash();
}
$old_content = '';
$new_content = '';
if ($old_hash === $new_hash) {
return null;
}
if ($old_hash !== self::EMPTY_HASH) {
$old_content = $old->loadFileData();
} else {
$old_content = '';
}
if ($new_hash !== self::EMPTY_HASH) {
$new_content = $new->loadFileData();
} else {
$new_content = '';
}
$dmp = new diff_match_patch();
$dmp_patches = $dmp->patch_make($old_content, $new_content);
return $dmp->patch_toText($dmp_patches);
}
}
/* First acquire a lock or wait until a lock can be acquired for server
* text and shadow. */
$serverTextEntry->lock();
$shadowTextEntry->lock();
$serverText = $serverTextEntry->get_value();
$shadowText = $shadowTextEntry->get_value();
$patchFromClient = $_POST['patch'];
/* Patch the shadow and server texts with the edits from the client. */
$dmp = new diff_match_patch();
$patchedServerText = $dmp->patch_apply($dmp->patch_fromText($patchFromClient), $serverText);
$serverTextEntry->put_value($patchedServerText[0]);
$patchedShadowText = $dmp->patch_apply($dmp->patch_fromText($patchFromClient), $shadowText);
/* Make a diff between server text and shadow to get the edits to send
* back to the client. */
$patchFromServer = $dmp->patch_toText($dmp->patch_make($patchedShadowText[0], $patchedServerText[0]));
/* Apply it to the shadow. */
$patchedShadowText = $dmp->patch_apply($dmp->patch_fromText($patchFromServer), $patchedShadowText[0]);
$shadowTextEntry->put_value($patchedShadowText[0]);
/* Release locks. */
$serverTextEntry->unlock();
$shadowTextEntry->unlock();
echo formatJSEND('success', $patchFromServer);
break;
case 'sendHeartbeat':
/* Hard coded heartbeat time interval. Beware to keep this value here
* twice the value on client side. */
$maxHeartbeatInterval = 5;
$currentTime = time();
/* Check if the user is a new user, or if it is just an update of
* his heartbeat. */
