*/
/**
- *
+ * MediaWiki message cache structure version.
+ * Bump this whenever the message cache format has changed.
+ */
+define( 'MSG_CACHE_VERSION', 1 );
+
+/**
+ * Memcached timeout when loading a key.
+ * See MessageCache::load()
*/
define( 'MSG_LOAD_TIMEOUT', 60 );
+
+/**
+ * Memcached timeout when locking a key for a writing operation.
+ * See MessageCache::lock()
+ */
define( 'MSG_LOCK_TIMEOUT', 30 );
+/**
+ * Number of times we will try to acquire a lock from Memcached.
+ * This comes in addition to MSG_LOCK_TIMEOUT.
+ */
define( 'MSG_WAIT_TIMEOUT', 30 );
-define( 'MSG_CACHE_VERSION', 1 );
/**
* Message cache
*/
protected $mCache;
- // Should mean that database cannot be used, but check
+ /**
+ * Should mean that database cannot be used, but check
+ * @var bool $mDisable
+ */
protected $mDisable;
- /// Lifetime for cache, used by object caching
+ /**
+ * Lifetime for cache, used by object caching.
+ * Set on construction, see __construct().
+ */
protected $mExpiry;
/**
*/
protected $mParserOptions, $mParser;
- /// Variable for tracking which variables are already loaded
+ /**
+ * Variable for tracking which variables are already loaded
+ * @var array $mLoadedLanguages
+ */
protected $mLoadedLanguages = array();
/**
* Singleton instance
*
- * @var MessageCache
+ * @var MessageCache $instance
*/
private static $instance;
/**
- * @var bool
+ * @var bool $mInParser
*/
protected $mInParser = false;
self::$instance = null;
}
+ /**
+ * @param ObjectCache $memCached A cache instance. If none, fall back to CACHE_NONE.
+ * @param bool $useDB
+ * @param int $expiry Lifetime for cache. @see $mExpiry.
+ */
function __construct( $memCached, $useDB, $expiry ) {
if ( !$memCached ) {
$memCached = wfGetCache( CACHE_NONE );
function load( $code = false ) {
global $wgUseLocalMessageCache;
- if( !is_string( $code ) ) {
+ if ( !is_string( $code ) ) {
# This isn't really nice, so at least make a note about it and try to
# fall back
wfDebug( __METHOD__ . " called without providing a language code\n" );
}
/**
- * Represents a write lock on the messages key
+ * Represents a write lock on the messages key.
+ *
+ * Will retry MessageCache::MSG_WAIT_TIMEOUT times, each operations having
+ * a timeout of MessageCache::MSG_LOCK_TIMEOUT.
*
* @param string $key
* @return Boolean: success
/**
* Get a message from either the content language or the user language.
*
- * @param string $key The message cache key
- * @param bool $useDB Get the message from the DB, false to use only
- * the localisation
- * @param bool|string $langcode Code of the language to get the message for, if
- * it is a valid code create a language for that language,
- * if it is a string but not a valid code then make a basic
- * language object, if it is a false boolean then use the
- * current users language (as a fallback for the old
- * parameter functionality), or if it is a true boolean
- * then use the wikis content language (also as a
- * fallback).
- * @param bool $isFullKey Specifies whether $key is a two part key "msg/lang".
+ * First, assemble a list of languages to attempt getting the message from. This
+ * chain begins with the requested language and its fallbacks and then continues with
+ * the content language and its fallbacks. For each language in the chain, the following
+ * process will occur (in this order):
+ * 1. If a language-specific override, i.e., [[MW:msg/lang]], is available, use that.
+ * Note: for the content language, there is no /lang subpage.
+ * 2. Fetch from the static CDB cache.
+ * 3. If available, check the database for fallback language overrides.
*
- * @throws MWException
- * @return string|bool
+ * This process provides a number of guarantees. When changing this code, make sure all
+ * of these guarantees are preserved.
+ * * If the requested language is *not* the content language, then the CDB cache for that
+ * specific language will take precedence over the root database page ([[MW:msg]]).
+ * * Fallbacks will be just that: fallbacks. A fallback language will never be reached if
+ * the message is available *anywhere* in the language for which it is a fallback.
+ *
+ * @param string $key the message key
+ * @param bool $useDB If true, look for the message in the DB, false
+ * to use only the compiled l10n cache.
+ * @param bool|string|object $langcode Code of the language to get the message for.
+ * - If string and a valid code, will create a standard language object
+ * - If string but not a valid code, will create a basic language object
+ * - If boolean and false, create object from the current users language
+ * - If boolean and true, create object from the wikis content language
+ * - If language object, use it as given
+ * @param bool $isFullKey specifies whether $key is a two part key
+ * "msg/lang".
+ *
+ * @throws MWException when given an invalid key
+ * @return string|bool False if the message doesn't exist, otherwise the message (which can be empty)
*/
function get( $key, $useDB = true, $langcode = true, $isFullKey = false ) {
- global $wgLanguageCode, $wgContLang;
+ global $wgContLang;
- if ( is_int( $key ) ) {
- // "Non-string key given" exception sometimes happens for numerical
- // strings that become ints somewhere on their way here
- $key = strval( $key );
- }
+ $section = new ProfileSection( __METHOD__ );
- if ( !is_string( $key ) ) {
+ if ( is_int( $key ) ) {
+ // Fix numerical strings that somehow become ints
+ // on their way here
+ $key = (string)$key;
+ } elseif ( !is_string( $key ) ) {
throw new MWException( 'Non-string key given' );
- }
-
- if ( strval( $key ) === '' ) {
- # Shortcut: the empty key is always missing
+ } elseif ( $key === '' ) {
+ // Shortcut: the empty key is always missing
return false;
}
- $lang = wfGetLangObj( $langcode );
- if ( !$lang ) {
- throw new MWException( "Bad lang code $langcode given" );
+ // For full keys, get the language code from the key
+ $pos = strrpos( $key, '/' );
+ if ( $isFullKey && $pos !== false ) {
+ $langcode = substr( $key, $pos + 1 );
+ $key = substr( $key, 0, $pos );
}
- $langcode = $lang->getCode();
-
- $message = false;
-
- # Normalise title-case input (with some inlining)
- $lckey = str_replace( ' ', '_', $key );
+ // Normalise title-case input (with some inlining)
+ $lckey = strtr( $key, ' ', '_');
if ( ord( $key ) < 128 ) {
$lckey[0] = strtolower( $lckey[0] );
$uckey = ucfirst( $lckey );
$uckey = $wgContLang->ucfirst( $lckey );
}
- # Try the MediaWiki namespace
- if ( !$this->mDisable && $useDB ) {
- $title = $uckey;
- if ( !$isFullKey && ( $langcode != $wgLanguageCode ) ) {
- $title .= '/' . $langcode;
- }
- $message = $this->getMsgFromNamespace( $title, $langcode );
- }
-
- # Try the array in the language object
- if ( $message === false ) {
- $message = $lang->getMessage( $lckey );
- if ( is_null( $message ) ) {
- $message = false;
- }
- }
+ // Loop through each language in the fallback list until we find something useful
+ $lang = wfGetLangObj( $langcode );
+ $message = $this->getMessageFromFallbackChain( $lang, $lckey, $uckey, !$this->mDisable && $useDB );
- # Try the array of another language
+ // If we still have no message, maybe the key was in fact a full key so try that
if ( $message === false ) {
$parts = explode( '/', $lckey );
- # We may get calls for things that are http-urls from sidebar
- # Let's not load nonexistent languages for those
- # They usually have more than one slash.
+ // We may get calls for things that are http-urls from sidebar
+ // Let's not load nonexistent languages for those
+ // They usually have more than one slash.
if ( count( $parts ) == 2 && $parts[1] !== '' ) {
$message = Language::getMessageFor( $parts[0], $parts[1] );
- if ( is_null( $message ) ) {
+ if ( $message === null ) {
$message = false;
}
}
}
- # Is this a custom message? Try the default language in the db...
- if ( ( $message === false || $message === '-' ) &&
- !$this->mDisable && $useDB &&
- !$isFullKey && ( $langcode != $wgLanguageCode )
- ) {
+ // Post-processing if the message exists
+ if( $message !== false ) {
+ // Fix whitespace
+ $message = str_replace(
+ array(
+ # Fix for trailing whitespace, removed by textarea
+ ' ',
+ # Fix for NBSP, converted to space by firefox
+ ' ',
+ ' ',
+ ),
+ array(
+ ' ',
+ "\xc2\xa0",
+ "\xc2\xa0"
+ ),
+ $message
+ );
+ }
+
+ return $message;
+ }
+
+ /**
+ * Given a language, try and fetch a message from that language, then the
+ * fallbacks of that language, then the site language, then the fallbacks for the
+ * site language.
+ *
+ * @param Language $lang Requested language
+ * @param string $lckey Lowercase key for the message
+ * @param string $uckey Uppercase key for the message
+ * @param bool $useDB Whether to use the database
+ *
+ * @see MessageCache::get
+ * @return string|bool The message, or false if not found
+ */
+ protected function getMessageFromFallbackChain( $lang, $lckey, $uckey, $useDB ) {
+ global $wgLanguageCode, $wgContLang;
+
+ $langcode = $lang->getCode();
+ $message = false;
+
+ // First try the requested language.
+ if ( $useDB ) {
+ if ( $langcode === $wgLanguageCode ) {
+ // Messages created in the content language will not have the /lang extension
+ $message = $this->getMsgFromNamespace( $uckey, $langcode );
+ } else {
+ $message = $this->getMsgFromNamespace( "$uckey/$langcode", $langcode );
+ }
+ }
+
+ if ( $message !== false ) {
+ return $message;
+ }
+
+ // Check the CDB cache
+ $message = $lang->getMessage( $lckey );
+ if ( $message !== null ) {
+ return $message;
+ }
+
+ list( $fallbackChain, $siteFallbackChain ) = Language::getFallbacksIncludingSiteLanguage( $langcode );
+
+ // Next try checking the database for all of the fallback languages of the requested language.
+ if ( $useDB ) {
+ foreach ( $fallbackChain as $code ) {
+ if ( $code === $wgLanguageCode ) {
+ // Messages created in the content language will not have the /lang extension
+ $message = $this->getMsgFromNamespace( $uckey, $code );
+ } else {
+ $message = $this->getMsgFromNamespace( "$uckey/$code", $code );
+ }
+
+ if ( $message !== false ) {
+ // Found the message.
+ return $message;
+ }
+ }
+ }
+
+ // Now try checking the site language.
+ if ( $useDB ) {
$message = $this->getMsgFromNamespace( $uckey, $wgLanguageCode );
+ if ( $message !== false ) {
+ return $message;
+ }
}
- # Final fallback
- if ( $message === false ) {
- return false;
+ $message = $wgContLang->getMessage( $lckey );
+ if ( $message !== null ) {
+ return $message;
}
- # Fix whitespace
- $message = strtr( $message,
- array(
- # Fix for trailing whitespace, removed by textarea
- ' ' => ' ',
- # Fix for NBSP, converted to space by firefox
- ' ' => "\xc2\xa0",
- ' ' => "\xc2\xa0",
- ) );
+ // Finally try the DB for the site language's fallbacks.
+ if ( $useDB ) {
+ foreach ( $siteFallbackChain as $code ) {
+ $message = $this->getMsgFromNamespace( "$uckey/$code", $code );
+ if ( $message === false && $code === $wgLanguageCode ) {
+ // Messages created in the content language will not have the /lang extension
+ $message = $this->getMsgFromNamespace( $uckey, $code );
+ }
- return $message;
+ if ( $message !== false ) {
+ // Found the message.
+ return $message;
+ }
+ }
+ }
+
+ return false;
}
/**
*
* @param string $title Message cache key with initial uppercase letter.
* @param string $code Code denoting the language to try.
- * @return string|bool False on failure
+ * @return string|bool The message, or false iff it does not exist or on error
*/
function getMsgFromNamespace( $title, $code ) {
$this->load( $code );
if ( isset( $this->mCache[$code][$title] ) ) {
$entry = $this->mCache[$code][$title];
if ( substr( $entry, 0, 1 ) === ' ' ) {
- return substr( $entry, 1 );
+ // The message exists, so make sure a string
+ // is returned.
+ return (string)substr( $entry, 1 );
} elseif ( $entry === '!NONEXISTENT' ) {
return false;
} elseif ( $entry === '!TOO BIG' ) {
if ( $entry ) {
if ( substr( $entry, 0, 1 ) === ' ' ) {
$this->mCache[$code][$title] = $entry;
- return substr( $entry, 1 );
+ // The message exists, so make sure a string
+ // is returned.
+ return (string)substr( $entry, 1 );
} elseif ( $entry === '!NONEXISTENT' ) {
$this->mCache[$code][$title] = '!NONEXISTENT';
return false;
dépôts / lhc / web / wiklou.git / blobdiff