481 lines
14 KiB
PHP
481 lines
14 KiB
PHP
<?php
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/**
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* Holder of replacement pairs for wiki links
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*
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* @file
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*/
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/**
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* @ingroup Parser
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*/
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class LinkHolderArray {
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var $internals = array(), $interwikis = array();
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var $size = 0;
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var $parent;
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function __construct( $parent ) {
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$this->parent = $parent;
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}
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/**
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* Reduce memory usage to reduce the impact of circular references
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*/
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function __destruct() {
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foreach ( $this as $name => $value ) {
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unset( $this->$name );
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}
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}
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/**
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* Merge another LinkHolderArray into this one
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*/
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function merge( $other ) {
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foreach ( $other->internals as $ns => $entries ) {
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$this->size += count( $entries );
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if ( !isset( $this->internals[$ns] ) ) {
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$this->internals[$ns] = $entries;
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} else {
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$this->internals[$ns] += $entries;
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}
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}
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$this->interwikis += $other->interwikis;
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}
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/**
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* Returns true if the memory requirements of this object are getting large
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*/
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function isBig() {
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global $wgLinkHolderBatchSize;
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return $this->size > $wgLinkHolderBatchSize;
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}
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/**
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* Clear all stored link holders.
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* Make sure you don't have any text left using these link holders, before you call this
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*/
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function clear() {
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$this->internals = array();
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$this->interwikis = array();
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$this->size = 0;
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}
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/**
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* Make a link placeholder. The text returned can be later resolved to a real link with
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* replaceLinkHolders(). This is done for two reasons: firstly to avoid further
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* parsing of interwiki links, and secondly to allow all existence checks and
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* article length checks (for stub links) to be bundled into a single query.
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*
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*/
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function makeHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
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wfProfileIn( __METHOD__ );
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if ( ! is_object($nt) ) {
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# Fail gracefully
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$retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
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} else {
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# Separate the link trail from the rest of the link
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list( $inside, $trail ) = Linker::splitTrail( $trail );
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$entry = array(
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'title' => $nt,
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'text' => $prefix.$text.$inside,
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'pdbk' => $nt->getPrefixedDBkey(),
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);
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if ( $query !== '' ) {
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$entry['query'] = $query;
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}
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if ( $nt->isExternal() ) {
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// Use a globally unique ID to keep the objects mergable
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$key = $this->parent->nextLinkID();
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$this->interwikis[$key] = $entry;
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$retVal = "<!--IWLINK $key-->{$trail}";
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} else {
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$key = $this->parent->nextLinkID();
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$ns = $nt->getNamespace();
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$this->internals[$ns][$key] = $entry;
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$retVal = "<!--LINK $ns:$key-->{$trail}";
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}
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$this->size++;
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}
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wfProfileOut( __METHOD__ );
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return $retVal;
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}
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/**
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* Get the stub threshold
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*/
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function getStubThreshold() {
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global $wgUser;
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if ( !isset( $this->stubThreshold ) ) {
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$this->stubThreshold = $wgUser->getStubThreshold();
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}
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return $this->stubThreshold;
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}
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/**
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* FIXME: update documentation. makeLinkObj() is deprecated.
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* Replace <!--LINK--> link placeholders with actual links, in the buffer
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* Placeholders created in Skin::makeLinkObj()
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* Returns an array of link CSS classes, indexed by PDBK.
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*/
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function replace( &$text ) {
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wfProfileIn( __METHOD__ );
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$colours = $this->replaceInternal( $text );
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$this->replaceInterwiki( $text );
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wfProfileOut( __METHOD__ );
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return $colours;
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}
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/**
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* Replace internal links
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*/
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protected function replaceInternal( &$text ) {
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if ( !$this->internals ) {
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return;
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}
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wfProfileIn( __METHOD__ );
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global $wgContLang;
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$colours = array();
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$sk = $this->parent->getOptions()->getSkin( $this->parent->mTitle );
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$linkCache = LinkCache::singleton();
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$output = $this->parent->getOutput();
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wfProfileIn( __METHOD__.'-check' );
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$dbr = wfGetDB( DB_SLAVE );
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$page = $dbr->tableName( 'page' );
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$threshold = $this->getStubThreshold();
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# Sort by namespace
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ksort( $this->internals );
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$linkcolour_ids = array();
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# Generate query
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$query = false;
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$current = null;
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foreach ( $this->internals as $ns => $entries ) {
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foreach ( $entries as $entry ) {
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$title = $entry['title'];
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$pdbk = $entry['pdbk'];
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# Skip invalid entries.
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# Result will be ugly, but prevents crash.
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if ( is_null( $title ) ) {
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continue;
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}
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# Check if it's a static known link, e.g. interwiki
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if ( $title->isAlwaysKnown() ) {
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$colours[$pdbk] = '';
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} elseif ( $ns == NS_SPECIAL ) {
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$colours[$pdbk] = 'new';
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} elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
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$colours[$pdbk] = $sk->getLinkColour( $title, $threshold );
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$output->addLink( $title, $id );
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$linkcolour_ids[$id] = $pdbk;
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} elseif ( $linkCache->isBadLink( $pdbk ) ) {
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$colours[$pdbk] = 'new';
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} else {
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# Not in the link cache, add it to the query
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if ( !isset( $current ) ) {
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$current = $ns;
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$query = "SELECT page_id, page_namespace, page_title, page_is_redirect, page_len, page_latest";
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$query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
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} elseif ( $current != $ns ) {
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$current = $ns;
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$query .= ")) OR (page_namespace=$ns AND page_title IN(";
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} else {
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$query .= ', ';
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}
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$query .= $dbr->addQuotes( $title->getDBkey() );
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}
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}
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}
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if ( $query ) {
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$query .= '))';
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$res = $dbr->query( $query, __METHOD__ );
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# Fetch data and form into an associative array
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# non-existent = broken
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foreach ( $res as $s ) {
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$title = Title::makeTitle( $s->page_namespace, $s->page_title );
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$pdbk = $title->getPrefixedDBkey();
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$linkCache->addGoodLinkObj( $s->page_id, $title, $s->page_len, $s->page_is_redirect, $s->page_latest );
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$output->addLink( $title, $s->page_id );
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# FIXME: convoluted data flow
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# The redirect status and length is passed to getLinkColour via the LinkCache
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# Use formal parameters instead
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$colours[$pdbk] = $sk->getLinkColour( $title, $threshold );
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//add id to the extension todolist
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$linkcolour_ids[$s->page_id] = $pdbk;
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}
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unset( $res );
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}
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if ( count($linkcolour_ids) ) {
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//pass an array of page_ids to an extension
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wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
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}
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wfProfileOut( __METHOD__.'-check' );
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# Do a second query for different language variants of links and categories
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if($wgContLang->hasVariants()) {
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$this->doVariants( $colours );
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}
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# Construct search and replace arrays
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wfProfileIn( __METHOD__.'-construct' );
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$replacePairs = array();
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foreach ( $this->internals as $ns => $entries ) {
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foreach ( $entries as $index => $entry ) {
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$pdbk = $entry['pdbk'];
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$title = $entry['title'];
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$query = isset( $entry['query'] ) ? $entry['query'] : '';
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$key = "$ns:$index";
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$searchkey = "<!--LINK $key-->";
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if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] == 'new' ) {
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$linkCache->addBadLinkObj( $title );
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$colours[$pdbk] = 'new';
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$output->addLink( $title, 0 );
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// FIXME: replace deprecated makeBrokenLinkObj() by link()
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$replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
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$entry['text'],
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$query );
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} else {
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// FIXME: replace deprecated makeColouredLinkObj() by link()
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$replacePairs[$searchkey] = $sk->makeColouredLinkObj( $title, $colours[$pdbk],
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$entry['text'],
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$query );
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}
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}
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}
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$replacer = new HashtableReplacer( $replacePairs, 1 );
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wfProfileOut( __METHOD__.'-construct' );
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# Do the thing
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wfProfileIn( __METHOD__.'-replace' );
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$text = preg_replace_callback(
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'/(<!--LINK .*?-->)/',
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$replacer->cb(),
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$text);
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wfProfileOut( __METHOD__.'-replace' );
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wfProfileOut( __METHOD__ );
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}
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/**
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* Replace interwiki links
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*/
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protected function replaceInterwiki( &$text ) {
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if ( empty( $this->interwikis ) ) {
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return;
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}
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wfProfileIn( __METHOD__ );
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# Make interwiki link HTML
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$sk = $this->parent->getOptions()->getSkin( $this->parent->mTitle );
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$output = $this->parent->getOutput();
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$replacePairs = array();
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foreach( $this->interwikis as $key => $link ) {
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$replacePairs[$key] = $sk->link( $link['title'], $link['text'] );
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$output->addInterwikiLink( $link['title'] );
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}
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$replacer = new HashtableReplacer( $replacePairs, 1 );
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$text = preg_replace_callback(
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'/<!--IWLINK (.*?)-->/',
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$replacer->cb(),
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$text );
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wfProfileOut( __METHOD__ );
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}
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/**
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* Modify $this->internals and $colours according to language variant linking rules
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*/
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protected function doVariants( &$colours ) {
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global $wgContLang;
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$linkBatch = new LinkBatch();
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$variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
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$output = $this->parent->getOutput();
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$linkCache = LinkCache::singleton();
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$sk = $this->parent->getOptions()->getSkin( $this->parent->mTitle );
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$threshold = $this->getStubThreshold();
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$titlesToBeConverted = '';
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$titlesAttrs = array();
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// Concatenate titles to a single string, thus we only need auto convert the
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// single string to all variants. This would improve parser's performance
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// significantly.
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foreach ( $this->internals as $ns => $entries ) {
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foreach ( $entries as $index => $entry ) {
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$pdbk = $entry['pdbk'];
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// we only deal with new links (in its first query)
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if ( !isset( $colours[$pdbk] ) ) {
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$title = $entry['title'];
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$titleText = $title->getText();
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$titlesAttrs[] = array(
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'ns' => $ns,
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'key' => "$ns:$index",
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'titleText' => $titleText,
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);
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// separate titles with \0 because it would never appears
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// in a valid title
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$titlesToBeConverted .= $titleText . "\0";
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}
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}
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}
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// Now do the conversion and explode string to text of titles
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$titlesAllVariants = $wgContLang->autoConvertToAllVariants( $titlesToBeConverted );
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$allVariantsName = array_keys( $titlesAllVariants );
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foreach ( $titlesAllVariants as &$titlesVariant ) {
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$titlesVariant = explode( "\0", $titlesVariant );
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}
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$l = count( $titlesAttrs );
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// Then add variants of links to link batch
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for ( $i = 0; $i < $l; $i ++ ) {
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foreach ( $allVariantsName as $variantName ) {
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$textVariant = $titlesAllVariants[$variantName][$i];
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extract( $titlesAttrs[$i] );
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if($textVariant != $titleText){
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$variantTitle = Title::makeTitle( $ns, $textVariant );
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if( is_null( $variantTitle ) ) {
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continue;
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}
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$linkBatch->addObj( $variantTitle );
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$variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
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}
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}
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}
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// process categories, check if a category exists in some variant
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$categoryMap = array(); // maps $category_variant => $category (dbkeys)
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$varCategories = array(); // category replacements oldDBkey => newDBkey
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foreach( $output->getCategoryLinks() as $category ){
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$variants = $wgContLang->autoConvertToAllVariants( $category );
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foreach($variants as $variant){
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if($variant != $category){
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$variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
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if(is_null($variantTitle)) continue;
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$linkBatch->addObj( $variantTitle );
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$categoryMap[$variant] = $category;
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}
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}
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}
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if(!$linkBatch->isEmpty()){
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// construct query
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$dbr = wfGetDB( DB_SLAVE );
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$page = $dbr->tableName( 'page' );
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$titleClause = $linkBatch->constructSet('page', $dbr);
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$variantQuery = "SELECT page_id, page_namespace, page_title, page_is_redirect, page_len";
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$variantQuery .= " FROM $page WHERE $titleClause";
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$varRes = $dbr->query( $variantQuery, __METHOD__ );
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$linkcolour_ids = array();
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// for each found variants, figure out link holders and replace
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foreach ( $varRes as $s ) {
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$variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
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$varPdbk = $variantTitle->getPrefixedDBkey();
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$vardbk = $variantTitle->getDBkey();
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$holderKeys = array();
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if(isset($variantMap[$varPdbk])){
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$holderKeys = $variantMap[$varPdbk];
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$linkCache->addGoodLinkObj( $s->page_id, $variantTitle, $s->page_len, $s->page_is_redirect );
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$output->addLink( $variantTitle, $s->page_id );
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}
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// loop over link holders
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foreach($holderKeys as $key){
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list( $ns, $index ) = explode( ':', $key, 2 );
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$entry =& $this->internals[$ns][$index];
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$pdbk = $entry['pdbk'];
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if(!isset($colours[$pdbk])){
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// found link in some of the variants, replace the link holder data
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$entry['title'] = $variantTitle;
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$entry['pdbk'] = $varPdbk;
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// set pdbk and colour
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# FIXME: convoluted data flow
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# The redirect status and length is passed to getLinkColour via the LinkCache
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# Use formal parameters instead
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$colours[$varPdbk] = $sk->getLinkColour( $variantTitle, $threshold );
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$linkcolour_ids[$s->page_id] = $pdbk;
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}
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}
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// check if the object is a variant of a category
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if(isset($categoryMap[$vardbk])){
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$oldkey = $categoryMap[$vardbk];
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if($oldkey != $vardbk)
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$varCategories[$oldkey]=$vardbk;
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}
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}
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wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
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// rebuild the categories in original order (if there are replacements)
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if(count($varCategories)>0){
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$newCats = array();
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$originalCats = $output->getCategories();
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foreach($originalCats as $cat => $sortkey){
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// make the replacement
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if( array_key_exists($cat,$varCategories) )
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$newCats[$varCategories[$cat]] = $sortkey;
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else $newCats[$cat] = $sortkey;
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}
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$output->setCategoryLinks($newCats);
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}
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}
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}
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/**
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* Replace <!--LINK--> link placeholders with plain text of links
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* (not HTML-formatted).
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*
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* @param $text String
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* @return String
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*/
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function replaceText( $text ) {
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wfProfileIn( __METHOD__ );
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$text = preg_replace_callback(
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'/<!--(LINK|IWLINK) (.*?)-->/',
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array( &$this, 'replaceTextCallback' ),
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$text );
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wfProfileOut( __METHOD__ );
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return $text;
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}
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/**
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* Callback for replaceText()
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*
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* @param $matches Array
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* @return string
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* @private
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*/
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function replaceTextCallback( $matches ) {
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$type = $matches[1];
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$key = $matches[2];
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if( $type == 'LINK' ) {
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list( $ns, $index ) = explode( ':', $key, 2 );
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if( isset( $this->internals[$ns][$index]['text'] ) ) {
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return $this->internals[$ns][$index]['text'];
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}
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} elseif( $type == 'IWLINK' ) {
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if( isset( $this->interwikis[$key]['text'] ) ) {
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return $this->interwikis[$key]['text'];
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}
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}
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return $matches[0];
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}
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}
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