MediaWiki  1.29.2
ParserFunctions.hooks.php
Go to the documentation of this file.
1 <?php
2 
3 class ParserFunctionsHooks {
4 
11  public static function onRegistration() {
12  if ( isset( $GLOBALS['wgWikimediaJenkinsCI'] ) && $GLOBALS['wgWikimediaJenkinsCI'] === true ) {
13  $GLOBALS['wgPFEnableStringFunctions'] = true;
14  }
15  }
16 
21  public static function onParserFirstCallInit( $parser ) {
22  global $wgPFEnableStringFunctions;
23 
24  // These functions accept DOM-style arguments
25  $parser->setFunctionHook( 'if', 'ExtParserFunctions::ifObj', Parser::SFH_OBJECT_ARGS );
26  $parser->setFunctionHook( 'ifeq', 'ExtParserFunctions::ifeqObj', Parser::SFH_OBJECT_ARGS );
27  $parser->setFunctionHook( 'switch', 'ExtParserFunctions::switchObj', Parser::SFH_OBJECT_ARGS );
28  $parser->setFunctionHook( 'ifexist', 'ExtParserFunctions::ifexistObj', Parser::SFH_OBJECT_ARGS );
29  $parser->setFunctionHook( 'ifexpr', 'ExtParserFunctions::ifexprObj', Parser::SFH_OBJECT_ARGS );
30  $parser->setFunctionHook( 'iferror', 'ExtParserFunctions::iferrorObj', Parser::SFH_OBJECT_ARGS );
31  $parser->setFunctionHook( 'time', 'ExtParserFunctions::timeObj', Parser::SFH_OBJECT_ARGS );
32  $parser->setFunctionHook( 'timel', 'ExtParserFunctions::localTimeObj', Parser::SFH_OBJECT_ARGS );
33 
34  $parser->setFunctionHook( 'expr', 'ExtParserFunctions::expr' );
35  $parser->setFunctionHook( 'rel2abs', 'ExtParserFunctions::rel2abs' );
36  $parser->setFunctionHook( 'titleparts', 'ExtParserFunctions::titleparts' );
37 
38  // String Functions
39  if ( $wgPFEnableStringFunctions ) {
40  $parser->setFunctionHook( 'len', 'ExtParserFunctions::runLen' );
41  $parser->setFunctionHook( 'pos', 'ExtParserFunctions::runPos' );
42  $parser->setFunctionHook( 'rpos', 'ExtParserFunctions::runRPos' );
43  $parser->setFunctionHook( 'sub', 'ExtParserFunctions::runSub' );
44  $parser->setFunctionHook( 'count', 'ExtParserFunctions::runCount' );
45  $parser->setFunctionHook( 'replace', 'ExtParserFunctions::runReplace' );
46  $parser->setFunctionHook( 'explode', 'ExtParserFunctions::runExplode' );
47  $parser->setFunctionHook( 'urldecode', 'ExtParserFunctions::runUrlDecode' );
48  }
49 
50  return true;
51  }
52 
53  public static function onScribuntoExternalLibraries( $engine, array &$extraLibraries ) {
54  if ( $engine === 'lua' ) {
55  $extraLibraries['mw.ext.ParserFunctions'] = 'Scribunto_LuaParserFunctionsLibrary';
56  }
57  return true;
58  }
59 }
sample
they could even be mouse clicks or menu items whatever suits your program You should also get your if to sign a copyright disclaimer for the if necessary Here is a sample
Definition: COPYING.txt:326
is
We use the convention $dbr for read and $dbw for write to help you keep track of whether the database object is a the world will explode Or to be a subsequent write query which succeeded on the master may fail when replicated to the slave due to a unique key collision Replication on the slave will stop and it may take hours to repair the database and get it back online Setting read_only in my cnf on the slave will avoid this but given the dire we prefer to have as many checks as possible We provide a but the wrapper functions like please read the documentation for except in special pages derived from QueryPage It s a common pitfall for new developers to submit code containing SQL queries which examine huge numbers of rows Remember that COUNT * is(N), counting rows in atable is like counting beans in a bucket.------------------------------------------------------------------------ Replication------------------------------------------------------------------------The largest installation of MediaWiki, Wikimedia, uses a large set ofslave MySQL servers replicating writes made to a master MySQL server. Itis important to understand the issues associated with this setup if youwant to write code destined for Wikipedia.It 's often the case that the best algorithm to use for a given taskdepends on whether or not replication is in use. Due to our unabashedWikipedia-centrism, we often just use the replication-friendly version, but if you like, you can use wfGetLB() ->getServerCount() > 1 tocheck to see if replication is in use.===Lag===Lag primarily occurs when large write queries are sent to the master.Writes on the master are executed in parallel, but they are executed inserial when they are replicated to the slaves. The master writes thequery to the binlog when the transaction is committed. The slaves pollthe binlog and start executing the query as soon as it appears. They canservice reads while they are performing a write query, but will not readanything more from the binlog and thus will perform no more writes. Thismeans that if the write query runs for a long time, the slaves will lagbehind the master for the time it takes for the write query to complete.Lag can be exacerbated by high read load. MediaWiki 's load balancer willstop sending reads to a slave when it is lagged by more than 30 seconds.If the load ratios are set incorrectly, or if there is too much loadgenerally, this may lead to a slave permanently hovering around 30seconds lag.If all slaves are lagged by more than 30 seconds, MediaWiki will stopwriting to the database. All edits and other write operations will berefused, with an error returned to the user. This gives the slaves achance to catch up. Before we had this mechanism, the slaves wouldregularly lag by several minutes, making review of recent editsdifficult.In addition to this, MediaWiki attempts to ensure that the user seesevents occurring on the wiki in chronological order. A few seconds of lagcan be tolerated, as long as the user sees a consistent picture fromsubsequent requests. This is done by saving the master binlog positionin the session, and then at the start of each request, waiting for theslave to catch up to that position before doing any reads from it. Ifthis wait times out, reads are allowed anyway, but the request isconsidered to be in "lagged slave mode". Lagged slave mode can bechecked by calling wfGetLB() ->getLaggedSlaveMode(). The onlypractical consequence at present is a warning displayed in the pagefooter.===Lag avoidance===To avoid excessive lag, queries which write large numbers of rows shouldbe split up, generally to write one row at a time. Multi-row INSERT ...SELECT queries are the worst offenders should be avoided altogether.Instead do the select first and then the insert.===Working with lag===Despite our best efforts, it 's not practical to guarantee a low-lagenvironment. Lag will usually be less than one second, but mayoccasionally be up to 30 seconds. For scalability, it 's very importantto keep load on the master low, so simply sending all your queries tothe master is not the answer. So when you have a genuine need forup-to-date data, the following approach is advised:1) Do a quick query to the master for a sequence number or timestamp 2) Run the full query on the slave and check if it matches the data you gotfrom the master 3) If it doesn 't, run the full query on the masterTo avoid swamping the master every time the slaves lag, use of thisapproach should be kept to a minimum. In most cases you should just readfrom the slave and let the user deal with the delay.------------------------------------------------------------------------ Lock contention------------------------------------------------------------------------Due to the high write rate on Wikipedia(and some other wikis), MediaWiki developers need to be very careful to structure their writesto avoid long-lasting locks. By default, MediaWiki opens a transactionat the first query, and commits it before the output is sent. Locks willbe held from the time when the query is done until the commit. So youcan reduce lock time by doing as much processing as possible before youdo your write queries.Often this approach is not good enough, and it becomes necessary toenclose small groups of queries in their own transaction. Use thefollowing syntax:$dbw=wfGetDB(DB_MASTER
text
design txt This is a brief overview of the new design More thorough and up to date information is available on the documentation wiki at etc Handles the details of getting and saving to the user table of the and dealing with sessions and cookies OutputPage Encapsulates the entire HTML page that will be sent in response to any server request It is used by calling its functions to add text
Definition: design.txt:12
normal
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such and we might be restricted by PHP settings such as safe mode or open_basedir We cannot assume that the software even has read access anywhere useful Many shared hosts run all users web applications under the same so they can t rely on Unix and must forbid reads to even standard directories like tmp lest users read each others files We cannot assume that the user has the ability to install or run any programs not written as web accessible PHP scripts Since anything that works on cheap shared hosting will work if you have shell or root access MediaWiki s design is based around catering to the lowest common denominator Although we support higher end setups as the way many things work by default is tailored toward shared hosting These defaults are unconventional from the point of view of normal(non-web) applications -- they might conflict with distributors' policies
SFH_OBJECT_ARGS
const SFH_OBJECT_ARGS
Definition: Defines.php:196
so
c Accompany it with the information you received as to the offer to distribute corresponding source complete source code means all the source code for all modules it plus any associated interface definition plus the scripts used to control compilation and installation of the executable as a special the source code distributed need not include anything that is normally and so on of the operating system on which the executable unless that component itself accompanies the executable If distribution of executable or object code is made by offering access to copy from a designated then offering equivalent access to copy the source code from the same place counts as distribution of the source even though third parties are not compelled to copy the source along with the object code You may not or distribute the Program except as expressly provided under this License Any attempt otherwise to sublicense or distribute the Program is and will automatically terminate your rights under this License parties who have received or from you under this License will not have their licenses terminated so long as such parties remain in full compliance You are not required to accept this since you have not signed it nothing else grants you permission to modify or distribute the Program or its derivative works These actions are prohibited by law if you do not accept this License by modifying or distributing the you indicate your acceptance of this License to do so
Definition: COPYING.txt:185
ParserFunctionsHooks::onParserFirstCallInit
static onParserFirstCallInit( $parser)
Definition: ParserFunctions.hooks.php:21
lt
& lt
Definition: funcsParserTests.txt:124
php
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
article
design txt This is a brief overview of the new design More thorough and up to date information is available on the documentation wiki at etc Handles the details of getting and saving to the user table of the and dealing with sessions and cookies OutputPage Encapsulates the entire HTML page that will be sent in response to any server request It is used by calling its functions to add in any and then calling but I prefer the flexibility This should also do the output encoding The system allocates a global one in $wgOut Title Represents the title of an article
Definition: design.txt:25
used
you don t have to do a grep find to see where the $wgReverseTitle variable is used
Definition: hooks.txt:117
a
</source > ! result< div class="mw-highlight mw-content-ltr" dir="ltr">< pre >< span ></span >< span class="kd"> var</span >< span class="nx"> a</span >< span class="p"></span ></pre ></div > ! end ! test Multiline< source/> in lists !input *< source > a b</source > *foo< source > a b</source > ! html< ul >< li >< div class="mw-highlight mw-content-ltr" dir="ltr">< pre > a b</pre ></div ></li ></ul >< ul >< li > foo< div class="mw-highlight mw-content-ltr" dir="ltr">< pre > a b</pre ></div ></li ></ul > ! html tidy< ul >< li >< div class="mw-highlight mw-content-ltr" dir="ltr">< pre > a b</pre ></div ></li ></ul >< ul >< li > foo< div class="mw-highlight mw-content-ltr" dir="ltr">< pre > a b</pre ></div ></li ></ul > ! end ! test Custom attributes !input< source lang="javascript" id="foo" class="bar" dir="rtl" style="font-size: larger;"> var a
Definition: parserTests.txt:89
Page
! article ParserFunctions page ! text A sample page so we can test ifexist This used to be a Main Page
Definition: funcsParserTests.txt:14
File
! article ParserFunctions page ! text A sample page so we can test ifexist This used to be a Main but that caused duplicate article warnings when running the normal tests at the same time ! endarticle ! article File
Definition: funcsParserTests.txt:14
in
null for the wiki Added in
Definition: hooks.txt:1572
not
if not
Definition: COPYING.txt:307
div
div
Definition: parserTests.txt:6533
$parser
do that in ParserLimitReportFormat instead $parser
Definition: hooks.txt:2536
ParserFunctionsHooks::onRegistration
static onRegistration()
Enable string functions, when running Wikimedia Jenkins unit tests.
Definition: ParserFunctions.hooks.php:11
$engine
the value to return A Title object or null for latest all implement SearchIndexField $engine
Definition: hooks.txt:2782
global
when a variable name is used in a it is silently declared as a new masking the global
Definition: design.txt:93
ParserFunctionsHooks
Definition: ParserFunctions.hooks.php:3
$GLOBALS
$GLOBALS['wgAutoloadClasses']['LocalisationUpdate']
Definition: Autoload.php:10
none
</source > ! result< p > Text< code class="mw-highlight" dir="ltr">< span class="kd"> var</span >< span class="nx"> a</span >< span class="p"></span ></code ></p > ! end ! test Enclose none(inline code) !!input Text< source lang
specified
! hooks source ! endhooks ! test Non existent language !input< source lang="doesnotexist"> foobar</source > ! result< div class="mw-highlight mw-content-ltr" dir="ltr">< pre > foobar</pre ></div > ! end ! test No language specified ! wikitext< source > foo</source > ! html< div class="mw-highlight mw-content-ltr" dir="ltr">< pre > foo</pre ></div > ! end ! test No language specified(no wellformed xml) !! config !! wikitext< source > bar</source > !! html< div class
value
$status value
Definition: SyntaxHighlight_GeSHi.class.php:311
amp
& amp
Definition: parserTests.txt:57
language
and that you know you can do these things To protect your we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights These restrictions translate to certain responsibilities for you if you distribute copies of the or if you modify it For if you distribute copies of such a whether gratis or for a you must give the recipients all the rights that you have You must make sure that receive or can get the source code And you must show them these terms so they know their rights We protect your rights with two distribute and or modify the software for each author s protection and we want to make certain that everyone understands that there is no warranty for this free software If the software is modified by someone else and passed we want its recipients to know that what they have is not the so that any problems introduced by others will not reflect on the original authors reputations any free program is threatened constantly by software patents We wish to avoid the danger that redistributors of a free program will individually obtain patent in effect making the program proprietary To prevent we have made it clear that any patent must be licensed for everyone s free use or not licensed at all The precise terms and conditions for distribution and modification follow GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR DISTRIBUTION AND MODIFICATION This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License The refers to any such program or and a work based on the Program means either the Program or any derivative work under copyright a work containing the Program or a portion of either verbatim or with modifications and or translated into another language(Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying
c
type show c for details The hypothetical commands show w and show c should show the appropriate parts of the General Public License Of the commands you use may be called something other than show w and show c
Definition: COPYING.txt:321
ParserFunctionsHooks::onScribuntoExternalLibraries
static onScribuntoExternalLibraries( $engine, array &$extraLibraries)
Definition: ParserFunctions.hooks.php:53
page
do that in ParserLimitReportFormat instead use this to modify the parameters of the image and a DIV can begin in one section and end in another Make sure your code can handle that case gracefully See the EditSectionClearerLink extension for an example zero but section is usually empty its values are the globals values before the output is cached my talk page
Definition: hooks.txt:2536
output
design txt This is a brief overview of the new design More thorough and up to date information is available on the documentation wiki at etc Handles the details of getting and saving to the user table of the and dealing with sessions and cookies OutputPage Encapsulates the entire HTML page that will be sent in response to any server request It is used by calling its functions to add in any and then calling output() to send it all. It could be easily changed to send incrementally if that becomes useful
are
The ContentHandler facility adds support for arbitrary content types on wiki instead of relying on wikitext for everything It was introduced in MediaWiki Each kind of and so on Built in content types are
Definition: contenthandler.txt:5
values
This code would result in ircNotify being run twice when an article is and once for brion Hooks can return three possible values
Definition: hooks.txt:177
from
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for and distribution as defined by Sections through of this document Licensor shall mean the copyright owner or entity authorized by the copyright owner that is granting the License Legal Entity shall mean the union of the acting entity and all other entities that control are controlled by or are under common control with that entity For the purposes of this definition control direct or to cause the direction or management of such whether by contract or including but not limited to software source documentation and configuration files Object form shall mean any form resulting from mechanical transformation or translation of a Source including but not limited to compiled object generated and conversions to other media types Work shall mean the work of whether in Source or Object made available under the as indicated by a copyright notice that is included in or attached to the whether in Source or Object that is based or other modifications as a an original work of authorship For the purposes of this Derivative Works shall not include works that remain separable from
Definition: APACHE-LICENSE-2.0.txt:43
that
deferred txt A few of the database updates required by various functions here can be deferred until after the result page is displayed to the user For updating the view updating the linked to tables after a etc PHP does not yet have any way to tell the server to actually return and disconnect while still running these but it might have such a feature in the future We handle these by creating a deferred update object and putting those objects on a global then executing the whole list after the page is displayed We don t do anything smart like collating updates to the same table or such because the list is almost always going to have just one item on if that
Definition: deferred.txt:11
gt
DEF & gt
Definition: funcsParserTests.txt:123
then
skin txt MediaWiki includes four core it has been set as the default in MediaWiki since the replacing Monobook it had been the default skin since then
Definition: skin.txt:10
array
the array() calling protocol came about after MediaWiki 1.4rc1.