* Work around HipHop issue 314 (volatile broken) and issue 308 (no compilation detection) by adding some large and ugly compilation detection code to WebStart.php and doMaintenance.php.
* Provide an MW_COMPILED constant which can be used to detect compiled mode throughout the codebase.
* Introduced wfIsHipHop(), which detects either compiled or interpreted mode. Used this to work around unusual eval() return value in eval.php.
* Work around lack of ini_get() in Maintenance.php, by duplicating wfIsHipHop().
* In Maintenance::shouldExecute(), accept "include" as an inclusion function name, since all kinds of inclusion give this string in HipHop.
* Introduced new class MWInit, which provides some static functions in the pre-autoloader environment.
* Introduced MWInit::compiledPath(), which provides a relative path for invoking a compiled file, and MWInit::interpretedPath(), which provides an absolute path for interpreting a PHP file. Used these new functions in the appropriate places.
* When we are running compiled code, don't include files which would generate duplicate class, function or constant definitions. Documented the new requirements on the contents of Defines.php and UtfNormalDefines.php.
* In HipHop compiled mode, it's not possible to have executable code in the same file as a class definition.
** Moved MimeMagic initialisation to the constructor.
** Moved Namespace.php global variable initialisation to Setup.php.
** Moved MemcachedSessions.php initialisation to the caller in GlobalFunctions.php.
** Moved Sanitizer.php constants and global variables to static class members. Introduced an accessor function for the attribs regex, as a new place to put code formerly at file level.
** Moved Language.php initialisation of $wgLanguageNames to Language::getLanguageNames(). Removed the global variable, marked "private" since forever.
* In two places: don't use error_log() with type=3 to append to a file, HipHop doesn't support it. Use file_put_contents() with FILE_APPEND instead.
* Work around the terrible breakage of class_exists() by using MWInit::classExists() instead in various places. In WebInstaller::getPageByName(), the class_exists() was marked with a fixme comment already, so I replaced it with an autoloader solution.
* MessageCache::singleton() calls wfGetMessageCacheStorage() directly instead of using $messageMemc, just in case this would be called before that variable is set
* Per TimStarling: also removed deprecated methods in MessageCache class: addMessages() and related, [get|set|enable|disable]Transform(), loadAllMessages(), loadMessageFile() and some others. Same for the legacyData stuff in LocalisationCache that was only used by MessageCache::addMessages() and related.
* Converted remaining extensions
2. Add more Accept-Language XVO cache name for IE;
3. Use hreflang to specify canonical and alternate links, it's search engine friendly
when a wiki has multiple variant languages.
* Moved the responsibility for calling $wgOut->setPageTitle() from OutputPage::addParserOutputNoText() to the OutputPage/Parser caller. Previously, every call to $wgOut->addWikiText() (or any other message parsing function) was resulting in the title being reset to a converted version of $wgTitle, producing bug 23124. Moving responsibility to the caller seems to work fairly well, since there are apparently only two callers that really want {{DISPLAYTITLE}} etc. to work (EditPage and Article::view).
* Reverted data flow obfuscation in OutputPage::setHTMLTitle() from r64851, replaced by the above. The caller decides what overrides what.
* Reverted inappropriate, cache-polluting references to $wgUser and $wgRequest in Parser::parse(), introduced in r64819.
* Reverted incomprehensible boolean parameter to Language::convert() from r64851, reintroduced Language::convertTitle() instead. Gave it a simpler implementation than before.
* Fixed broken {{DISPLAYTITLE}} feature, was being unconditionally overwritten by the ParserOutput::setTitleText() call in Parser::parse(). Give {{DISPLAYTITLE}} precedence over autoconverted title, like we do for -{T|...}-.
* Tested extensively (perhaps not exhaustively)
* Rewrote convertArray() as an RD parser (with inline tokenizer) as suggested on CR r60986. Fixes unclosed rule issue (with parser test). Fixes O(N^2) timing.
* Removed $this->mMarkup abstraction. Life is complicated enough as it is.
* Replaced a couple of instances of explode() with StringUtils::explode(), limited element count in a couple more.
In ConverterRule:
* Removed mConvTable initialisation from the constructor, unnecessary
* Optimised the "-{xxx}-" tight loop by replacing function calls such as count() and in_array() with language constructs such as isset(). Reduced execution time from 356us to 275us.
* Cached $varsep_pattern for further reduction to 243us.
* A couple more parseFlags() hacks brings it back to 230us.
* Split out $this->mVariantFlags from $this->mFlags. Rearranged flag detection into a foreach/switch to avoid unnecessary isset() calls. 189us.
* Added a special-case optimisation to generateConvTable() for the case where there are no tables defined inline in the article. 116us.
* Fixed bug from r37499: "!R || !N" is always true since they are mutually exclusive, "!R && !N" was intended (with parser test).
* Fixed E_NOTICE from "-{N|foo}-"
* Don't set Parser::$mTitle to random garbage.
* Remove ParserOutput::$displayTitle, make setDisplayTitle() and
getDisplayTitle() wrappers for their *TitleText() equivalents.
* Remove Parser::$mDo*Convert member variables, move test for
$mDoubleUnderScores[] directives closer to the action.
* Remove bogus "global $wgContLang".
* Use accessor to get at $mConvRuleTitle
* Fix up showtitle option in parserTests.inc
* TODO: refactor FakeConverter class away
Recover the -{T| }- rule. Add the ability to test for it to the parserTests and add a test for it. Add a couple of disabled tests that I think demonstrate bugs in the LanguageTranslator
