Inheritance diagram for ParserOutput:

Collaboration diagram for ParserOutput:

Public Member Functions
	__construct ($text= '', $languageLinks=[], $categoryLinks=[], $unused=false, $titletext= '')

	__sleep ()
	Save space for serialization by removing useless values. More...

	addCategory ($c, $sort)

	addExternalLink ($url)

	addHeadItem ($section, $tag=false)
	Add some text to the "<head>". More...

	addImage ($name, $timestamp=null, $sha1=null)
	Register a file dependency for this output. More...

	addInterwikiLink ($title)

	addJsConfigVars ($keys, $value=null)
	Add one or more variables to be set in mw.config in JavaScript. More...

	addLanguageLink ($t)

	addLink (Title $title, $id=null)
	Record a local or interwiki inline link for saving in future link tables. More...

	addModuleMessages ($modules)

	addModules ($modules)

	addModuleScripts ($modules)

	addModuleStyles ($modules)

	addOutputHook ($hook, $data=false)

	addOutputPageMetadata (OutputPage $out)
	Copy items from the OutputPage object into this one. More...

	addTemplate ($title, $page_id, $rev_id)
	Register a template dependency for this output. More...

	addTrackingCategory ($msg, $title)
	Add a tracking category, getting the title from a system message, or print a debug message if the title is invalid. More...

	addWarning ($s)

&	getCategories ()

	getCategoryLinks ()

	getDisplayTitle ()
	Get the title to be used for display. More...

	getEditSectionTokens ()

	getEnableOOUI ()

	getExtensionData ($key)
	Gets extensions data previously attached to this ParserOutput using setExtensionData(). More...

&	getExternalLinks ()

&	getFileSearchOptions ()

	getFlag ($flag)

	getHeadItems ()

	getHideNewSection ()

&	getImages ()

	getIndexPolicy ()

	getIndicators ()

	getInterwikiLinks ()

	getJsConfigVars ()

&	getLanguageLinks ()

	getLimitReportData ()

&	getLinks ()

	getModuleMessages ()

	getModules ()

	getModuleScripts ()

	getModuleStyles ()

	getNewSection ()

	getNoGallery ()

	getOutputHooks ()

	getProperties ()

	getProperty ($name)

	getRawText ()
	Get the cacheable text with <mw:editsection> markers still in it. More...

	getSections ()

&	getTemplateIds ()

&	getTemplates ()

	getText ()

	getTimeSinceStart ($clock)
	Returns the time since resetParseStartTime() was last called. More...

	getTimestamp ()

	getTitleText ()

	getTOCEnabled ()

	getTOCHTML ()

	getUsedOptions ()
	Returns the options from its ParserOptions which have been taken into account to produce this output or false if not available. More...

	getWarnings ()

	hasDynamicContent ()
	Check whether the cache TTL was lowered due to dynamic content. More...

	hideNewSection ($value)

	preventClickjacking ($flag=null)
	Get or set the prevent-clickjacking flag. More...

	recordOption ($option)
	Tags a parser option for use in the cache key for this parser output. More...

	resetParseStartTime ()
	Resets the parse start timestamps for future calls to getTimeSinceStart() More...

	setCategoryLinks ($cl)

	setDisplayTitle ($text)
	Override the title to be used for display. More...

	setEditSectionTokens ($t)

	setEnableOOUI ($enable=false)
	Enables OOUI, if true, in any OutputPage instance this ParserOutput object is added to. More...

	setExtensionData ($key, $value)
	Attaches arbitrary data to this ParserObject. More...

	setFlag ($flag)
	Fairly generic flag setter thingy. More...

	setIndexPolicy ($policy)

	setIndicator ($id, $content)

	setLanguageLinks ($ll)

	setLimitReportData ($key, $value)
	Sets parser limit report data for a key. More...

	setNewSection ($value)

	setProperty ($name, $value)
	Set a property to be stored in the page_props database table. More...

	setSections ($toc)

	setText ($text)

	setTimestamp ($timestamp)

	setTitleText ($t)

	setTOCEnabled ($flag)

	setTOCHTML ($tochtml)

	unsetProperty ($name)

Public Member Functions inherited from CacheTime
	expired ($touched)
	Return true if this cached output object predates the global or per-article cache invalidation timestamps, or if it comes from an incompatible older version. More...

	getCacheExpiry ()
	Returns the number of seconds after which this object should expire. More...

	getCacheRevisionId ()

	getCacheTime ()

	isCacheable ()

	isDifferentRevision ($id)
	Return true if this cached output object is for a different revision of the page. More...

	setCacheRevisionId ($id)

	setCacheTime ($t)
	setCacheTime() sets the timestamp expressing when the page has been rendered. More...

	updateCacheExpiry ($seconds)
	Sets the number of seconds after which this object should expire. More...

Static Public Member Functions
static	isLinkInternal ($internal, $url)
	Checks, if a url is pointing to the own server. More...

Public Attributes
	$mCategories

	$mEditSectionTokens = false

	$mEnableOOUI = false

	$mExternalLinks = []

	$mFileSearchOptions = []

	$mHeadItems = []

	$mHideNewSection = false

	$mImages = []

	$mIndicators = []

	$mInterwikiLinks = []

	$mJsConfigVars = []

	$mLanguageLinks

	$mLinks = []

	$mModules = []

	$mModuleScripts = []

	$mModuleStyles = []

	$mNewSection = false

	$mNoGallery = false

	$mOutputHooks = []

	$mProperties = []

	$mSections = []

	$mTemplateIds = []

	$mTemplates = []

	$mText

	$mTimestamp

	$mTitleText

	$mTOCEnabled = true

	$mTOCHTML = ''

	$mWarnings = []

const	EDITSECTION_REGEX

Public Attributes inherited from CacheTime
	$mCacheExpiry = null

	$mCacheRevisionId = null

	$mCacheTime = ''

array bool	$mUsedOptions
	ParserOptions which have been taken into account to produce output or false if not available. More...

	$mVersion = Parser::VERSION

Static Private Member Functions
static	getTimes ($clock=null)

Private Attributes
	$mAccessedOptions = []

	$mExtensionData = []

	$mFlags = []

	$mIndexPolicy = ''

	$mLimitReportData = []

	$mParseStartTime = []

	$mPreventClickjacking = false

Detailed Description

Definition at line 24 of file ParserOutput.php.

Constructor & Destructor Documentation

ParserOutput::__construct	(	$text = `''`,
		$languageLinks = `[]`,
		$categoryLinks = `[]`,
		$unused = `false`,
		$titletext = `''`
	)

Definition at line 214 of file ParserOutput.php.

Member Function Documentation

ParserOutput::__sleep ( )

Save space for serialization by removing useless values.

Returns: array

Definition at line 1040 of file ParserOutput.php.

ParserOutput::addCategory	(	$c,
		$sort
	)

Definition at line 443 of file ParserOutput.php.

References $sort.

Referenced by addTrackingCategory().

ParserOutput::addExternalLink ( $url )

Definition at line 508 of file ParserOutput.php.

References $wgServer, and global.

ParserOutput::addHeadItem	(	$section,
		$tag = `false`
	)

Add some text to the "<head>".

If $tag is set, the section with that tag will only be included once in a given page.

Parameters

string	$section
string \| bool	$tag

Definition at line 615 of file ParserOutput.php.

References $section, and $tag.

ParserOutput::addImage	(	$name,
		$timestamp = `null`,
		$sha1 = `null`
	)

Register a file dependency for this output.

Parameters

string	$name	Title dbKey
string	$timestamp	MW timestamp of file creation (or false if non-existing)
string	$sha1	Base 36 SHA-1 of file (or false if non-existing)

Returns: void

Definition at line 566 of file ParserOutput.php.

References $name, and $timestamp.

ParserOutput::addInterwikiLink ( $title )

Parameters

Title $title Title object, must be an interwiki link

Exceptions

MWException If given invalid input

Definition at line 597 of file ParserOutput.php.

References $title.

Referenced by addLink(), and LinkHolderArray\replaceInterwiki().

ParserOutput::addJsConfigVars	(	$keys,
		$value = `null`
	)

Add one or more variables to be set in mw.config in JavaScript.

Parameters

string \| array	$keys	Key or array of key/value pairs.
mixed	$value	[optional] Value of the configuration variable.

Since: 1.23

Definition at line 650 of file ParserOutput.php.

References $key, $keys, $value, and as.

Referenced by addOutputPageMetadata(), ProtectionForm\buildForm(), ImagePage\openShowImage(), and MediaWiki\performRequest().

ParserOutput::addLanguageLink ( $t )

Definition at line 465 of file ParserOutput.php.

References $t.

ParserOutput::addLink	(	Title	$title,
			$id = `null`
	)

Record a local or interwiki inline link for saving in future link tables.

Parameters

Title	$title
int \| null	$id	Optional known page_id so we can skip the lookup

Definition at line 531 of file ParserOutput.php.

References addInterwikiLink(), Title\getArticleID(), Title\getDBkey(), Title\getNamespace(), Title\isExternal(), NS_FILE, NS_MEDIA, and NS_SPECIAL.

Referenced by LinkHolderArray\doVariants(), WikitextContent\fillParserOutput(), and LinkHolderArray\replaceInternal().

ParserOutput::addModuleMessages ( $modules )

Deprecated:

since 1.26 Use addModules() instead

Parameters

string | array $modules

Definition at line 639 of file ParserOutput.php.

References wfDeprecated().

ParserOutput::addModules ( $modules )

Definition at line 623 of file ParserOutput.php.

References array().

Referenced by addOutputPageMetadata(), ProtectionForm\buildForm(), SpecialWatchlist\execute(), ImagePage\openShowImage(), and MediaWiki\performRequest().

ParserOutput::addModuleScripts ( $modules )

Definition at line 627 of file ParserOutput.php.

References array().

Referenced by addOutputPageMetadata().

ParserOutput::addModuleStyles ( $modules )

Definition at line 631 of file ParserOutput.php.

References array().

Referenced by addOutputPageMetadata(), JsonContent\fillParserOutput(), and WikitextContent\fillParserOutput().

ParserOutput::addOutputHook	(	$hook,
		$data = `false`
	)

Definition at line 473 of file ParserOutput.php.

ParserOutput::addOutputPageMetadata ( OutputPage $out )

Copy items from the OutputPage object into this one.

Parameters

OutputPage $out

Definition at line 666 of file ParserOutput.php.

References addJsConfigVars(), addModules(), addModuleScripts(), addModuleStyles(), OutputPage\getHeadItemsArray(), OutputPage\getJsConfigVars(), OutputPage\getModules(), OutputPage\getModuleScripts(), OutputPage\getModuleStyles(), and OutputPage\getPreventClickjacking().

ParserOutput::addTemplate	(	$title,
		$page_id,
		$rev_id
	)

Register a template dependency for this output.

Parameters

Title	$title
int	$page_id
int	$rev_id

Returns: void

Definition at line 580 of file ParserOutput.php.

References $title.

ParserOutput::addTrackingCategory	(	$msg,
		$title
	)

Add a tracking category, getting the title from a system message, or print a debug message if the title is invalid.

Any message used with this function should be registered so it will show up on Special:TrackingCategories. Core messages should be added to SpecialTrackingCategories::$coreTrackingCategories, and extensions should add to "TrackingCategories" in their extension.json.

Parameters

string	$msg	Message key
Title	$title	title of the page which is being tracked

Returns: bool Whether the addition was successful

Since: 1.25

Definition at line 690 of file ParserOutput.php.

References $title, addCategory(), getProperty(), Title\makeTitleSafe(), NS_CATEGORY, NS_SPECIAL, wfDebug(), and wfMessage().

ParserOutput::addWarning ( $s )

Definition at line 469 of file ParserOutput.php.

References $s.

& ParserOutput::getCategories ( )

Definition at line 287 of file ParserOutput.php.

References $mCategories.

Referenced by LinksUpdate\__construct(), LinkHolderArray\doVariants(), CategoryMembershipChangeJob\getCategoriesAtRev(), ParserTest\runTest(), SpecialExpandTemplates\showHtmlPreview(), and NewParserTest\testParserTest().

ParserOutput::getCategoryLinks ( )

Definition at line 283 of file ParserOutput.php.

Referenced by LinkHolderArray\doVariants().

ParserOutput::getDisplayTitle ( )

Get the title to be used for display.

As per the contract of setDisplayTitle(), this is safe HTML, ready to be served to the client.

Returns: string HTML

Definition at line 741 of file ParserOutput.php.

References $t, and getTitleText().

ParserOutput::getEditSectionTokens ( )

Definition at line 306 of file ParserOutput.php.

References $mEditSectionTokens.

ParserOutput::getEnableOOUI ( )

Definition at line 399 of file ParserOutput.php.

References $mEnableOOUI.

ParserOutput::getExtensionData ( $key )

Gets extensions data previously attached to this ParserOutput using setExtensionData().

Typically, such data would be set while parsing the page, e.g. by a parser function.

Since: 1.21

Parameters

string $key The key to look up.

Returns: mixed|null The value previously set for the given key using setExtensionData() or null if no value was set for this key.

Definition at line 935 of file ParserOutput.php.

References $key.

& ParserOutput::getExternalLinks ( )

Definition at line 330 of file ParserOutput.php.

References $mExternalLinks.

Referenced by LinksUpdate\__construct().

& ParserOutput::getFileSearchOptions ( )

Definition at line 326 of file ParserOutput.php.

References $mFileSearchOptions.

ParserOutput::getFlag ( $flag )

Definition at line 757 of file ParserOutput.php.

Referenced by ApiStashEdit\buildStashValue().

ParserOutput::getHeadItems ( )

Definition at line 338 of file ParserOutput.php.

References $mHeadItems.

ParserOutput::getHideNewSection ( )

Definition at line 483 of file ParserOutput.php.

References $mHideNewSection.

& ParserOutput::getImages ( )

Definition at line 322 of file ParserOutput.php.

References $mImages.

Referenced by LinksUpdate\__construct().

ParserOutput::getIndexPolicy ( )

Definition at line 376 of file ParserOutput.php.

References $mIndexPolicy.

ParserOutput::getIndicators ( )

Since: 1.25

Definition at line 294 of file ParserOutput.php.

References $mIndicators.

Referenced by ParserTest\runTest(), and NewParserTest\testParserTest().

ParserOutput::getInterwikiLinks ( )

Definition at line 279 of file ParserOutput.php.

References $mInterwikiLinks.

Referenced by LinksUpdate\__construct().

ParserOutput::getJsConfigVars ( )

Since: 1.23

Definition at line 364 of file ParserOutput.php.

References $mJsConfigVars.

& ParserOutput::getLanguageLinks ( )

Definition at line 275 of file ParserOutput.php.

References $mLanguageLinks.

Referenced by LinksUpdate\__construct(), ParserTest\runTest(), and NewParserTest\testParserTest().

ParserOutput::getLimitReportData ( )

Definition at line 391 of file ParserOutput.php.

References $mLimitReportData.

Referenced by EditPage\getPreviewLimitReport().

& ParserOutput::getLinks ( )

Definition at line 310 of file ParserOutput.php.

References $mLinks.

Referenced by LinksUpdate\__construct().

ParserOutput::getModuleMessages ( )

Deprecated:

since 1.26 Obsolete

Returns: array

Definition at line 358 of file ParserOutput.php.

References wfDeprecated().

ParserOutput::getModules ( )

Definition at line 342 of file ParserOutput.php.

References $mModules.

ParserOutput::getModuleScripts ( )

Definition at line 346 of file ParserOutput.php.

References $mModuleScripts.

ParserOutput::getModuleStyles ( )

Definition at line 350 of file ParserOutput.php.

References $mModuleStyles.

ParserOutput::getNewSection ( )

Definition at line 486 of file ParserOutput.php.

References $mNewSection.

ParserOutput::getNoGallery ( )

Definition at line 334 of file ParserOutput.php.

References $mNoGallery.

ParserOutput::getOutputHooks ( )

Definition at line 368 of file ParserOutput.php.

References $mOutputHooks, and array().

ParserOutput::getProperties ( )

Definition at line 841 of file ParserOutput.php.

References $mProperties.

Referenced by LinksUpdate\__construct().

ParserOutput::getProperty ( $name )

Parameters

string $name The property name to look up.

Returns: mixed|bool The value previously set using setProperty(). False if null or no value was set for the given property name.

Note: You need to use getProperties() to check for boolean and null properties.

Definition at line 833 of file ParserOutput.php.

References $name.

Referenced by addTrackingCategory().

ParserOutput::getRawText ( )

Get the cacheable text with <mw:editsection> markers still in it.

The return value is suitable for writing back via setText() but is not valid for display to the user.

Since: 1.27

Definition at line 230 of file ParserOutput.php.

References $mText.

Referenced by WikitextContent\fillParserOutput().

ParserOutput::getSections ( )

Definition at line 302 of file ParserOutput.php.

References $mSections.

& ParserOutput::getTemplateIds ( )

Definition at line 318 of file ParserOutput.php.

References $mTemplateIds.

& ParserOutput::getTemplates ( )

Definition at line 314 of file ParserOutput.php.

References $mTemplates.

Referenced by LinksUpdate\__construct().

ParserOutput::getText ( )

Definition at line 234 of file ParserOutput.php.

References $mText, $skin, $wgLang, $wgOut, EDITSECTION_REGEX, global, Title\newFromText(), Parser\TOC_END, and Parser\TOC_START.

Referenced by DumpRenderer\handleRevision(), ParserTest\runTest(), and NewParserTest\testParserTest().

static ParserOutput::getTimes ( $clock = null )

staticprivate

Definition at line 943 of file ParserOutput.php.

References $ret, and wfGetRusage().

array $mParseStartTime Timestamps for ParserOutput::getTimeSinceStart ( $clock )

Returns the time since resetParseStartTime() was last called.

Clocks available are:

wall: Wall clock time
cpu: CPU time (requires getrusage)

Since: 1.22

Parameters

string $clock

Returns: float|null

Definition at line 977 of file ParserOutput.php.

ParserOutput::getTimestamp ( )

Returns: string|null TS_MW timestamp of the revision content

Definition at line 387 of file ParserOutput.php.

References $mTimestamp.

Referenced by ApiStashEdit\buildStashValue().

ParserOutput::getTitleText ( )

Definition at line 298 of file ParserOutput.php.

References $mTitleText.

Referenced by Article\adjustDisplayTitle(), getDisplayTitle(), ParserTest\runTest(), and NewParserTest\testParserTest().

ParserOutput::getTOCEnabled ( )

Definition at line 395 of file ParserOutput.php.

References $mTOCEnabled.

ParserOutput::getTOCHTML ( )

Definition at line 380 of file ParserOutput.php.

References $mTOCHTML.

ParserOutput::getUsedOptions ( )

Returns the options from its ParserOptions which have been taken into account to produce this output or false if not available.

Returns: array

Definition at line 853 of file ParserOutput.php.

ParserOutput::getWarnings ( )

Definition at line 372 of file ParserOutput.php.

ParserOutput::hasDynamicContent ( )

Check whether the cache TTL was lowered due to dynamic content.

When content is determined by more than hard state (e.g. page edits), such as template/file transclusions based on the current timestamp or extension tags that generate lists based on queries, this return true.

Returns: bool

Since: 1.25

Definition at line 1019 of file ParserOutput.php.

References $wgParserCacheExpireTime, CacheTime\getCacheExpiry(), and global.

Referenced by WikiPage\triggerOpportunisticLinksUpdate().

ParserOutput::hideNewSection ( $value )

Definition at line 480 of file ParserOutput.php.

References $value.

static ParserOutput::isLinkInternal	(	$internal,
		$url
	)

static

Checks, if a url is pointing to the own server.

Parameters

string	$internal	The server to check against
string	$url	The url to check

Returns: bool

Definition at line 497 of file ParserOutput.php.

References check, http, https, in, is(), link, links, of, or, query, and server.

Referenced by ParserOutputTest\testIsLinkInternal().

ParserOutput::preventClickjacking ( $flag = null )

Get or set the prevent-clickjacking flag.

Since: 1.24

Parameters

bool | null $flag New flag value, or null to leave it unchanged

Returns: bool Old flag value

Definition at line 1032 of file ParserOutput.php.

References wfSetVar().

ParserOutput::recordOption ( $option )

Tags a parser option for use in the cache key for this parser output.

Registered as a watcher at ParserOptions::registerWatcher() by Parser::clearState(). The information gathered here is available via getUsedOptions(), and is used by ParserCache::save().

See also: ParserCache::getKey; ParserCache::save; ParserOptions::addExtraKey; ParserOptions::optionsHash

Parameters

string $option

Definition at line 872 of file ParserOutput.php.

ParserOutput::resetParseStartTime ( )

Resets the parse start timestamps for future calls to getTimeSinceStart()

Since: 1.22

Definition at line 962 of file ParserOutput.php.

ParserOutput::setCategoryLinks ( $cl )

Definition at line 411 of file ParserOutput.php.

References wfSetVar().

Referenced by LinkHolderArray\doVariants().

ParserOutput::setDisplayTitle ( $text )

Override the title to be used for display.

Note: this is assumed to have been validated (check equal normalisation, etc.); this is expected to be safe HTML, ready to be served to the client.

Parameters

string $text Desired title text

Definition at line 728 of file ParserOutput.php.

References setProperty(), and setTitleText().

ParserOutput::setEditSectionTokens ( $t )

Definition at line 423 of file ParserOutput.php.

References $t, and wfSetVar().

ParserOutput::setEnableOOUI ( $enable = false )

Enables OOUI, if true, in any OutputPage instance this ParserOutput object is added to.

Since: 1.26

Parameters

bool $enable If OOUI should be enabled or not

Definition at line 461 of file ParserOutput.php.

ParserOutput::setExtensionData	(	$key,
		$value
	)

Attaches arbitrary data to this ParserObject.

This can be used to store some information in the ParserOutput object for later use during page output. The data will be cached along with the ParserOutput object, but unlike data set using setProperty(), it is not recorded in the database.

This method is provided to overcome the unsafe practice of attaching extra information to a ParserObject by directly assigning member variables.

To use setExtensionData() to pass extension information from a hook inside the parser to a hook in the page output, use this in the parser hook:

Example:: $parser->getOutput()->setExtensionData( 'my_ext_foo', '...' );

And then later, in OutputPageParserOutput or similar:

Example:: $output->getExtensionData( 'my_ext_foo' );

In MediaWiki 1.20 and older, you have to use a custom member variable within the ParserOutput object:

Example:: $parser->getOutput()->my_ext_foo = '...';

Since: 1.21

Parameters

string	$key	The key for accessing the data. Extensions should take care to avoid conflicts in naming keys. It is suggested to use the extension's name as a prefix.
mixed	$value	The value to set. Setting a value to null is equivalent to removing the value.

Definition at line 916 of file ParserOutput.php.

References $key, and $value.

ParserOutput::setFlag ( $flag )

Fairly generic flag setter thingy.

Parameters

string $flag

Definition at line 753 of file ParserOutput.php.

ParserOutput::setIndexPolicy ( $policy )

Definition at line 427 of file ParserOutput.php.

References wfSetVar().

ParserOutput::setIndicator	(	$id,
		$content
	)

Since: 1.25

Definition at line 450 of file ParserOutput.php.

References $content.

ParserOutput::setLanguageLinks ( $ll )

Definition at line 407 of file ParserOutput.php.

References wfSetVar().

ParserOutput::setLimitReportData	(	$key,
		$value
	)

Sets parser limit report data for a key.

The key is used as the prefix for various messages used for formatting:

$key: The label for the field in the limit report
$key-value-text: Message used to format the value in the "NewPP limit report" HTML comment. If missing, uses $key-format.
$key-value-html: Message used to format the value in the preview limit report table. If missing, uses $key-format.
$key-value: Message used to format the value. If missing, uses "$1".

Note that all values are interpreted as wikitext, and so should be encoded with htmlspecialchars() as necessary, but should avoid complex HTML for sanity of display in the "NewPP limit report" comment.

Since: 1.22

Parameters

string	$key	Message key
mixed	$value	Appropriate for Message::params()

Definition at line 1005 of file ParserOutput.php.

References $key, and $value.

ParserOutput::setNewSection ( $value )

Definition at line 477 of file ParserOutput.php.

References $value.

ParserOutput::setProperty	(	$name,
		$value
	)

Set a property to be stored in the page_props database table.

page_props is a key value store indexed by the page ID. This allows the parser to set a property on a page which can then be quickly retrieved given the page ID or via a DB join when given the page title.

Since 1.23, page_props are also indexed by numeric value, to allow for efficient "top k" queries of pages wrt a given property.

setProperty() is thus used to propagate properties from the parsed page to request contexts other than a page view of the currently parsed article.

Some applications examples:

To implement hidden categories, hiding pages from category listings by storing a property.
Overriding the displayed article title.
See also
ParserOutput::setDisplayTitle()
To implement image tagging, for example displaying an icon on an image thumbnail to indicate that it is listed for deletion on Wikimedia Commons. This is not actually implemented, yet but would be pretty cool.

Note: Do not use setProperty() to set a property which is only used in a context where the ParserOutput object itself is already available, for example a normal page view. There is no need to save such a property in the database since the text is already parsed. You can just hook OutputPageParserOutput and get your data out of the ParserOutput object.

If you are writing an extension where you want to set a property in the parser which is used by an OutputPageParserOutput hook, you have to associate the extension data directly with the ParserOutput object. Since MediaWiki 1.21, you can use setExtensionData() to do this: