<?php
# $Id: Article.php,v 1.154.2.18 2005/08/29 23:56:50 vibber Exp $
#
# Class representing a Wikipedia article and history.
# See design.doc for an overview.

# Note: edit user interface and cache support functions have been
# moved to separate EditPage and CacheManager classes.

require_once( 'CacheManager.php' );

class Article {
	/* private */ var $mContent, $mContentLoaded;
	/* private */ var $mUser, $mTimestamp, $mUserText;
	/* private */ var $mCounter, $mComment, $mCountAdjustment;
	/* private */ var $mMinorEdit, $mRedirectedFrom;
	/* private */ var $mTouched, $mFileCache, $mTitle;
	/* private */ var $mId, $mTable;

	function Article( &$title ) {
		$this->mTitle =& $title;
		$this->clear();
	}

	/* private */ function clear()
	{
		$this->mContentLoaded = false;
		$this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
		$this->mRedirectedFrom = $this->mUserText =
		$this->mTimestamp = $this->mComment = $this->mFileCache = '';
		$this->mCountAdjustment = 0;
		$this->mTouched = '19700101000000';
	}

	# Get revision text associated with an old or archive row
	# $row is usually an object from wfFetchRow(), both the flags and the text field must be included
	/* static */ function getRevisionText( $row, $prefix = 'old_' ) {
		# Get data
		$textField = $prefix . 'text';
		$flagsField = $prefix . 'flags';

		if ( isset( $row->$flagsField ) ) {
			$flags = explode( ",", $row->$flagsField );
		} else {
			$flags = array();
		}

		if ( isset( $row->$textField ) ) {
			$text = $row->$textField;
		} else {
			return false;
		}

		if ( in_array( 'link', $flags ) ) {
			# Handle link type
			$text = Article::followLink( $text );
		} elseif ( in_array( 'gzip', $flags ) ) {
			# Deal with optional compression of archived pages.
			# This can be done periodically via maintenance/compressOld.php, and
			# as pages are saved if $wgCompressRevisions is set.
			return gzinflate( $text );
		}
		return $text;
	}

	/* static */ function compressRevisionText( &$text ) {
		global $wgCompressRevisions;
		if( !$wgCompressRevisions ) {
			return '';
		}
		if( !function_exists( 'gzdeflate' ) ) {
			wfDebug( "Article::compressRevisionText() -- no zlib support, not compressing\n" );
			return '';
		}
		$text = gzdeflate( $text );
		return 'gzip';
	}

	# Returns the text associated with a "link" type old table row
	/* static */ function followLink( $link ) {
		# Split the link into fields and values
		$lines = explode( '\n', $link );
		$hash = '';
		$locations = array();
		foreach ( $lines as $line ) {
			# Comments
			if ( $line{0} == '#' ) {
				continue;
			}
			# Field/value pairs
			if ( preg_match( '/^(.*?)\s*:\s*(.*)$/', $line, $matches ) ) {
				$field = strtolower($matches[1]);
				$value = $matches[2];
				if ( $field == 'hash' ) {
					$hash = $value;
				} elseif ( $field == 'location' ) {
					$locations[] = $value;
				}
			}
		}

		if ( $hash === '' ) {
			return false;
		}

		# Look in each specified location for the text
		$text = false;
		foreach ( $locations as $location ) {
			$text = Article::fetchFromLocation( $location, $hash );
			if ( $text !== false ) {
				break;
			}
		}

		return $text;
	}

	/* static */ function fetchFromLocation( $location, $hash ) {
		global $wgLoadBalancer;
		$fname = 'fetchFromLocation';
		wfProfileIn( $fname );

		$p = strpos( $location, ':' );
		if ( $p === false ) {
			wfProfileOut( $fname );
			return false;
		}

		$type = substr( $location, 0, $p );
		$text = false;
		switch ( $type ) {
			case 'mysql':
				# MySQL locations are specified by mysql://<machineID>/<dbname>/<tblname>/<index>
				# Machine ID 0 is the current connection
				if ( preg_match( '/^mysql:\/\/(\d+)\/([A-Za-z_]+)\/([A-Za-z_]+)\/([A-Za-z_]+)$/',
				  $location, $matches ) ) {
					$machineID = $matches[1];
					$dbName = $matches[2];
					$tblName = $matches[3];
					$index = $matches[4];
					if ( $machineID == 0 ) {
						# Current connection
						$db =& wfGetDB();
					} else {
						# Alternate connection
						$db =& $wgLoadBalancer->getConnection( $machineID );

						if ( array_key_exists( $machineId, $wgKnownMysqlServers ) ) {
							# Try to open, return false on failure
							$params = $wgKnownDBServers[$machineId];
							$db = Database::newFromParams( $params['server'], $params['user'], $params['password'],
								$dbName, 1, false, true, true );
						}
					}
					if ( $db->isOpen() ) {
						$index = wfStrencode( $index );
						$res = $db->query( "SELECT blob_data FROM $dbName.$tblName WHERE blob_index='$index'", $fname );
						$row = $db->fetchObject( $res );
						$text = $row->text_data;
					}
				}
				break;
			case 'file':
				# File locations are of the form file://<filename>, relative to the current directory
				if ( preg_match( '/^file:\/\/(.*)$', $location, $matches ) )
				$filename = strstr( $location, 'file://' );
				$text = @file_get_contents( $matches[1] );
		}
		if ( $text !== false ) {
			# Got text, now we need to interpret it
			# The first line contains information about how to do this
			$p = strpos( $text, '\n' );
			$type = substr( $text, 0, $p );
			$text = substr( $text, $p + 1 );
			switch ( $type ) {
				case 'plain':
					break;
				case 'gzip':
					$text = gzinflate( $text );
					break;
				case 'object':
					$object = unserialize( $text );
					$text = $object->getItem( $hash );
					break;
				default:
					$text = false;
			}
		}
		wfProfileOut( $fname );
		return $text;
	}

	# Note that getContent/loadContent may follow redirects if
	# not told otherwise, and so may cause a change to mTitle.

	# Return the text of this revision
	function getContent( $noredir )
	{
		global $wgRequest;

		# Get variables from query string :P
		$action = $wgRequest->getText( 'action', 'view' );
		$section = $wgRequest->getText( 'section' );

		$fname =  'Article::getContent';
		wfProfileIn( $fname );

		if ( 0 == $this->getID() ) {
			if ( 'edit' == $action ) {
				wfProfileOut( $fname );
				return ''; # was "newarticletext", now moved above the box)
			}
			wfProfileOut( $fname );
			return wfMsg( 'noarticletext' );
		} else {
			$this->loadContent( $noredir );

			if(
				# check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
				( $this->mTitle->getNamespace() == Namespace::getTalk( Namespace::getUser()) ) &&
				  preg_match('/^\d{1,3}\.\d{1,3}.\d{1,3}\.\d{1,3}$/',$this->mTitle->getText()) &&
				  $action=='view'
				)
				{
				wfProfileOut( $fname );
				return $this->mContent . "\n" .wfMsg('anontalkpagetext'); }
			else {
				if($action=='edit') {
					if($section!='') {
						if($section=='new') {
							wfProfileOut( $fname );
							return '';
						}

						# strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
						# comments to be stripped as well)
						$rv=$this->getSection($this->mContent,$section);
						wfProfileOut( $fname );
						return $rv;
					}
				}
				wfProfileOut( $fname );
				return $this->mContent;
			}
		}
	}

	# This function returns the text of a section, specified by a number ($section).
 	# A section is text under a heading like == Heading == or <h1>Heading</h1>, or
	# the first section before any such heading (section 0).
	#
	# If a section contains subsections, these are also returned.
	#
	function getSection($text,$section)  {

		# strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
		# comments to be stripped as well)
		$striparray=array();
		$parser=new Parser();
		$parser->mOutputType=OT_WIKI;
		$parser->mOptions = new ParserOptions();
		$striptext=$parser->strip($text, $striparray, true);

		# now that we can be sure that no pseudo-sections are in the source,
		# split it up by section
		$secs =
		  preg_split(
		  '/(^=+.*?=+|^<h[1-6].*?' . '>.*?<\/h[1-6].*?' . '>)/mi',
		  $striptext, -1,
		  PREG_SPLIT_DELIM_CAPTURE);
		if($section==0) {
			$rv=$secs[0];
		} else {
			$headline=$secs[$section*2-1];
			preg_match( '/^(=+).*?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>/mi',$headline,$matches);
			$hlevel=$matches[1];

			# translate wiki heading into level
			if(strpos($hlevel,'=')!==false) {
				$hlevel=strlen($hlevel);
			}

			$rv=$headline. $secs[$section*2];
			$count=$section+1;

			$break=false;
			while(!empty($secs[$count*2-1]) && !$break) {

				$subheadline=$secs[$count*2-1];
				preg_match( '/^(=+).*?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>/mi',$subheadline,$matches);
				$subhlevel=$matches[1];
				if(strpos($subhlevel,'=')!==false) {
					$subhlevel=strlen($subhlevel);
				}
				if($subhlevel > $hlevel) {
					$rv.=$subheadline.$secs[$count*2];
				}
				if($subhlevel <= $hlevel) {
					$break=true;
				}
				$count++;

			}
		}
		# reinsert stripped tags
		$rv=$parser->unstrip($rv,$striparray);
		$rv=$parser->unstripNoWiki($rv,$striparray);
		$rv=trim($rv);
		return $rv;

	}


	# Load the revision (including cur_text) into this object
	function loadContent( $noredir = false )
	{
		global $wgOut, $wgMwRedir, $wgRequest, $wgIsPg, $wgLoadBalancer;

		# Query variables :P
		$oldid = $wgRequest->getVal( 'oldid' );
		$redirect = $wgRequest->getVal( 'redirect' );

		if ( $this->mContentLoaded ) return;
		$fname = 'Article::loadContent';

		# Pre-fill content with error message so that if something
		# fails we'll have something telling us what we intended.

		$t = $this->mTitle->getPrefixedText();
		if ( isset( $oldid ) ) {
			$oldid = IntVal( $oldid );
			$t .= ",oldid={$oldid}";
		}
		if ( isset( $redirect ) ) {
			$redirect = ($redirect == 'no') ? 'no' : 'yes';
			$t .= ",redirect={$redirect}";
		}
		$this->mContent = wfMsg( 'missingarticle', $t );

		if ( ! $oldid ) {	# Retrieve current version
			$id = $this->getID();
			if ( 0 == $id ) return;

			$sql = 'SELECT ' .
			  'cur_text,cur_timestamp,cur_user,cur_user_text,cur_comment,cur_counter,cur_restrictions,cur_touched ' .
			  "FROM cur WHERE cur_id={$id}";
			wfDebug( "$sql\n" );
			$res = wfQuery( $sql, DB_READ, $fname );
			if ( 0 == wfNumRows( $res ) ) {
				return;
			}

			$s = wfFetchObject( $res );
			# If we got a redirect, follow it (unless we've been told
			# not to by either the function parameter or the query
			if ( ( 'no' != $redirect ) && ( false == $noredir ) &&
			  ( $wgMwRedir->matchStart( $s->cur_text ) ) ) {
				if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/',
				  $s->cur_text, $m ) ) {
					$rt = Title::newFromText( $m[1] );
					# Don't follow redirects pointing to Special:Userlogin
					if( $rt && ! ( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) ) {
						# Gotta hand redirects to special pages differently:
						# Fill the HTTP response "Location" header and ignore
						# the rest of the page we're on.

						if ( $rt->getInterwiki() != '' ) {
							$wgOut->redirect( $rt->getFullURL() ) ;
							return;
						}
						if ( $rt->getNamespace() == Namespace::getSpecial() ) {
							$wgOut->redirect( $rt->getFullURL() );
							return;
						}
						$rid = $rt->getArticleID();
						if ( 0 != $rid ) {
							$sql = 'SELECT cur_text,cur_timestamp,cur_user,cur_user_text,cur_comment,' .
							  "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
							$res = wfQuery( $sql, DB_READ, $fname );

							if ( 0 != wfNumRows( $res ) ) {
								$this->mRedirectedFrom = $this->mTitle->getPrefixedText();
								$this->mTitle = $rt;
								$s = wfFetchObject( $res );
							}
						}
					}
				}
			}

			$this->mContent = $s->cur_text;
			$this->mUser = $s->cur_user;
			$this->mUserText = $s->cur_user_text;
			$this->mComment = $s->cur_comment;
			$this->mCounter = $s->cur_counter;
			$this->mTimestamp = $s->cur_timestamp;
			$this->mTouched = $s->cur_touched;
			$this->mTitle->mRestrictions = explode( ',', trim( $s->cur_restrictions ) );
			$this->mTitle->mRestrictionsLoaded = true;
			wfFreeResult( $res );
		} else { # oldid set, retrieve historical version
			$wgLoadBalancer->force(-1);
			$oldtable=$wgIsPg?'"old"':'old';
			$sql = "SELECT old_namespace,old_title,old_text,old_timestamp,".
				"old_user,old_user_text,old_comment,old_flags FROM old ".
			  	"WHERE old_id={$oldid}";
			$res = wfQuery( $sql, DB_READ, $fname );
			$wgLoadBalancer->force(0);
			if ( 0 == wfNumRows( $res ) ) {
				return;
			}

			$s = wfFetchObject( $res );
			if( $this->mTitle->getNamespace() != $s->old_namespace ||
				$this->mTitle->getDBkey() != $s->old_title ) {
				$oldTitle = Title::makeTitle( $s->old_namesapce, $s->old_title );
				$this->mTitle = $oldTitle;
				$wgTitle = $oldTitle;
			}
			$this->mContent = Article::getRevisionText( $s );
			$this->mUser = $s->old_user;
			$this->mUserText = $s->old_user_text;
			$this->mComment = $s->old_comment;
			$this->mCounter = 0;
			$this->mTimestamp = $s->old_timestamp;
			wfFreeResult( $res );
		}
		$this->mContentLoaded = true;
		return $this->mContent;
	}

	# Gets the article text without using so many damn globals
	# Returns false on error
	function getContentWithoutUsingSoManyDamnGlobals( $oldid = 0, $noredir = false ) {
		global $wgMwRedir, $wgIsPg;

		if ( $this->mContentLoaded ) {
			return $this->mContent;
		}
		$this->mContent = false;

		$fname = 'Article::loadContent';

		if ( ! $oldid ) {	# Retrieve current version
			$id = $this->getID();
			if ( 0 == $id ) {
				return false;
			}

			$sql = 'SELECT ' .
			  'cur_text,cur_timestamp,cur_user,cur_counter,cur_restrictions,cur_touched ' .
			  "FROM cur WHERE cur_id={$id}";
			$res = wfQuery( $sql, DB_READ, $fname );
			if ( 0 == wfNumRows( $res ) ) {
				return false;
			}

			$s = wfFetchObject( $res );
			# If we got a redirect, follow it (unless we've been told
			# not to by either the function parameter or the query
			if ( !$noredir && $wgMwRedir->matchStart( $s->cur_text ) ) {
				if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/',
				  $s->cur_text, $m ) ) {
					$rt = Title::newFromText( $m[1] );
					if( $rt &&  $rt->getInterwiki() == '' && $rt->getNamespace() != Namespace::getSpecial() ) {
						$rid = $rt->getArticleID();
						if ( 0 != $rid ) {
							$sql = 'SELECT cur_text,cur_timestamp,cur_user,' .
							  "cur_counter,cur_restrictions,cur_touched FROM cur WHERE cur_id={$rid}";
							$res = wfQuery( $sql, DB_READ, $fname );

							if ( 0 != wfNumRows( $res ) ) {
								$this->mRedirectedFrom = $this->mTitle->getPrefixedText();
								$this->mTitle = $rt;
								$s = wfFetchObject( $res );
							}
						}
					}
				}
			}

			$this->mContent = $s->cur_text;
			$this->mUser = $s->cur_user;
			$this->mCounter = $s->cur_counter;
			$this->mTimestamp = $s->cur_timestamp;
			$this->mTouched = $s->cur_touched;
			$this->mTitle->mRestrictions = explode( ",", trim( $s->cur_restrictions ) );
			$this->mTitle->mRestrictionsLoaded = true;
			wfFreeResult( $res );
		} else { # oldid set, retrieve historical version
			$oldtable=$wgIsPg?'"old"':'old';
			$sql = "SELECT old_text,old_timestamp,old_user,old_flags FROM $oldtable " .
			  "WHERE old_id={$oldid}";
			$res = wfQuery( $sql, DB_READ, $fname );
			if ( 0 == wfNumRows( $res ) ) {
				return false;
			}

			$s = wfFetchObject( $res );
			$this->mContent = Article::getRevisionText( $s );
			$this->mUser = $s->old_user;
			$this->mCounter = 0;
			$this->mTimestamp = $s->old_timestamp;
			wfFreeResult( $res );
		}
		$this->mContentLoaded = true;
		return $this->mContent;
	}

	function getID() {
		if( $this->mTitle ) {
			return $this->mTitle->getArticleID();
		} else {
			return 0;
		}
	}

	function getCount()
	{
		if ( -1 == $this->mCounter ) {
			$id = $this->getID();
			$this->mCounter = wfGetSQL( 'cur', 'cur_counter', "cur_id={$id}" );
		}
		return $this->mCounter;
	}

	# Would the given text make this article a "good" article (i.e.,
	# suitable for including in the article count)?

	function isCountable( $text )
	{
		global $wgUseCommaCount, $wgMwRedir;

		if ( 0 != $this->mTitle->getNamespace() ) { return 0; }
		if ( $wgMwRedir->matchStart( $text ) ) { return 0; }
		$token = ($wgUseCommaCount ? ',' : '[[' );
		if ( false === strstr( $text, $token ) ) { return 0; }
		return 1;
	}

	# Loads everything from cur except cur_text
	# This isn't necessary for all uses, so it's only done if needed.

	/* private */ function loadLastEdit()
	{
		global $wgOut;
		if ( -1 != $this->mUser ) return;

		$sql = 'SELECT cur_user,cur_user_text,cur_timestamp,' .
		  'cur_comment,cur_minor_edit FROM cur WHERE ' .
		  'cur_id=' . $this->getID();
		$res = wfQuery( $sql, DB_READ, 'Article::loadLastEdit' );

		if ( wfNumRows( $res ) > 0 ) {
			$s = wfFetchObject( $res );
			$this->mUser = $s->cur_user;
			$this->mUserText = $s->cur_user_text;
			$this->mTimestamp = $s->cur_timestamp;
			$this->mComment = $s->cur_comment;
			$this->mMinorEdit = $s->cur_minor_edit;
		}
	}

	function getTimestamp()
	{
		$this->loadLastEdit();
		return $this->mTimestamp;
	}

	function getUser()
	{
		$this->loadLastEdit();
		return $this->mUser;
	}

	function getUserText()
	{
		$this->loadLastEdit();
		return $this->mUserText;
	}

	function getComment()
	{
		$this->loadLastEdit();
		return $this->mComment;
	}

	function getMinorEdit()
	{
		$this->loadLastEdit();
		return $this->mMinorEdit;
	}

        function getContributors($limit = 0, $offset = 0)
        {
                $fname = 'Article::getContributors';

	        # XXX: this is expensive; cache this info somewhere.

	        $title = $this->mTitle;

	        $contribs = array();

                $sql = 'SELECT old_user, old_user_text, ' .
                       '  user_real_name, MAX(old_timestamp) as timestamp' .
                       ' FROM old LEFT JOIN user ON old.old_user = user.user_id ' .
	               ' WHERE old.old_namespace = ' . $title->getNamespace() .
                       ' AND old.old_title = "' . $title->getDBkey() . '"' .
                       ' AND old.old_user != ' . $this->getUser() .
                       ' GROUP BY old.old_user ' .
                       ' ORDER BY timestamp DESC ';

                if ($limit > 0) {
                        $sql .= ' LIMIT '.$limit;
                }

	        $res = wfQuery($sql, DB_READ, $fname);

        	while ( $line = wfFetchObject( $res ) ) {
	 	        $contribs[] = array($line->old_user, $line->old_user_text, $line->user_real_name);
  	        }

	        wfFreeResult($res);

	        return $contribs;
	}

	# This is the default action of the script: just view the page of
	# the given title.

	function view()
	{
		global $wgUser, $wgOut, $wgLang, $wgRequest;
		global $wgLinkCache, $IP, $wgEnableParserCache;

		$fname = 'Article::view';
		wfProfileIn( $fname );

		# Get variables from query string :P
		$oldid = $wgRequest->getVal( 'oldid' );
		$diff = $wgRequest->getVal( 'diff' );

		$wgOut->setArticleFlag( true );
		$wgOut->setRobotpolicy( 'index,follow' );

		# If we got diff and oldid in the query, we want to see a
		# diff page instead of the article.

		if ( !is_null( $diff ) ) {
			$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
			$de = new DifferenceEngine( intval($oldid), intval($diff) );
			$de->showDiffPage();
			wfProfileOut( $fname );
			if( $diff == 0 ) {
				# Run view updates for current revision only
				$this->viewUpdates();
			}
			return;
		}

		if ( empty( $oldid ) && $this->checkTouched() ) {
			if( $wgOut->checkLastModified( $this->mTouched ) ){
				return;
			} else if ( $this->tryFileCache() ) {
				# tell wgOut that output is taken care of
				$wgOut->disable();
				$this->viewUpdates();
				return;
			}
		}

		# Should the parser cache be used?
		if ( $wgEnableParserCache && intval($wgUser->getOption( 'stubthreshold' )) == 0 && empty( $oldid ) ) {
			$pcache = true;
		} else {
			$pcache = false;
		}

		$outputDone = false;
		if ( $pcache ) {
			if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
				$outputDone = true;
			}
		}

		if ( !$outputDone ) {
			$text = $this->getContent( false ); # May change mTitle by following a redirect

			# Another whitelist check in case oldid or redirects are altering the title
			if ( !$this->mTitle->userCanRead() ) {
				$wgOut->loginToUse();
				$wgOut->output();
				exit;
			}


			# We're looking at an old revision

			if ( !empty( $oldid ) ) {
				$this->setOldSubtitle();
				$wgOut->setRobotpolicy( 'noindex,follow' );
			}
			if ( '' != $this->mRedirectedFrom ) {
				$sk = $wgUser->getSkin();
				$redir = $sk->makeKnownLink( $this->mRedirectedFrom, '',
				  'redirect=no' );
				$s = wfMsg( 'redirectedfrom', $redir );
				$wgOut->setSubtitle( $s );

				# Can't cache redirects
				$pcache = false;
			}

			$wgLinkCache->preFill( $this->mTitle );

			# wrap user css and user js in pre and don't parse
			# XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
			if (
				$this->mTitle->getNamespace() == Namespace::getUser() &&
				preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
			) {
				$wgOut->addWikiText( wfMsg('clearyourcache'));
				$wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
			} else if ( $pcache ) {
				$wgOut->addWikiText( $text, true, $this );
			} else {
				$wgOut->addWikiText( $text );
			}
		}
		$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );

		# Add link titles as META keywords
		$wgOut->addMetaTags() ;

		$this->viewUpdates();
		wfProfileOut( $fname );
	}

	# Theoretically we could defer these whole insert and update
	# functions for after display, but that's taking a big leap
	# of faith, and we want to be able to report database
	# errors at some point.

	/* private */ function insertNewArticle( $text, $summary, $isminor, $watchthis )
	{
		global $wgOut, $wgUser, $wgLinkCache, $wgMwRedir;
		global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer, $wgIsPg, $wgIsMySQL;

		$fname = 'Article::insertNewArticle';

		$this->mCountAdjustment = $this->isCountable( $text );

		$ns = $this->mTitle->getNamespace();
		$ttl = $this->mTitle->getDBkey();
		$text = $this->preSaveTransform( $text );
		if ( $wgMwRedir->matchStart( $text ) ) { $redir = 1; }
		else { $redir = 0; }

		$now = wfTimestampNow();
		$won = wfInvertTimestamp( $now );
		wfSeedRandom();
		$rand = number_format( mt_rand() / mt_getrandmax(), 12, '.', '' );

		if ($wgIsPg) {
			$cur_id_column="cur_id,";
			$cur_id=wfGetSQL(""," nextval('cur_cur_id_seq')");
			$cur_id_value="{$cur_id},";
		} else {
			$cur_id_column="";
			$cur_id="";
			$cur_id_value="";
		}

		$isminor = ( $isminor && $wgUser->getID() ) ? 1 : 0;
		$sql = "INSERT INTO cur ({$cur_id_column}cur_namespace,cur_title,cur_text," .
		  'cur_comment,cur_user,cur_timestamp,cur_minor_edit,cur_counter,' .
		  'cur_restrictions,cur_user_text,cur_is_redirect,' .
		  "cur_is_new,cur_random,cur_touched,inverse_timestamp) VALUES ({$cur_id_value}{$ns},'" . wfStrencode( $ttl ) . "', '" .
		  wfStrencode( $text ) . "', '" .
		  wfStrencode( $summary ) . "', '" .
		  $wgUser->getID() . "', '{$now}', " .
		  $isminor . ", 0, '', '" .
		  wfStrencode( $wgUser->getName() ) . "', $redir, 1, $rand, '{$now}', '{$won}')";
		$res = wfQuery( $sql, DB_WRITE, $fname );

		$newid = $wgIsPg?$cur_id:wfInsertId();
		$this->mTitle->resetArticleID( $newid );

		Article::onArticleCreate( $this->mTitle );
		RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary );

		if ($watchthis) {
			if(!$this->mTitle->userIsWatching()) $this->watch();
		} else {
			if ( $this->mTitle->userIsWatching() ) {
				$this->unwatch();
			}
		}

		# The talk page isn't in the regular link tables, so we need to update manually:
		$talkns = $ns ^ 1; # talk -> normal; normal -> talk
		$sql = "UPDATE cur set cur_touched='$now' WHERE cur_namespace=$talkns AND cur_title='" . wfStrencode( $ttl ) . "'";
		wfQuery( $sql, DB_WRITE );

		# standard deferred updates
		$this->editUpdates( $text );

		$this->showArticle( $text, wfMsg( 'newarticle' ) );
	}


	/* Side effects: loads last edit */
	function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = ''){
		$this->loadLastEdit();
		$oldtext = $this->getContent( true );
		if ($section != '') {
			if($section=='new') {
				if($summary) $subject="== {$summary} ==\n\n";
				$text=$oldtext."\n\n".$subject.$text;
			} else {

				# strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
				# comments to be stripped as well)
				$striparray=array();
				$parser=new Parser();
				$parser->mOutputType=OT_WIKI;
				$parser->mOptions = new ParserOptions();
				$oldtext=$parser->strip($oldtext, $striparray, true);

				# now that we can be sure that no pseudo-sections are in the source,
				# split it up
				# Unfortunately we can't simply do a preg_replace because that might
				# replace the wrong section, so we have to use the section counter instead
				$secs=preg_split('/(^=+.*?=+|^<h[1-6].*?' . '>.*?<\/h[1-6].*?' . '>)/mi',
				  $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
				$secs[$section*2]=$text."\n\n"; // replace with edited

				# section 0 is top (intro) section
				if($section!=0) {

					# headline of old section - we need to go through this section
					# to determine if there are any subsections that now need to
					# be erased, as the mother section has been replaced with
					# the text of all subsections.
					$headline=$secs[$section*2-1];
					preg_match( '/^(=+).*?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>/mi',$headline,$matches);
					$hlevel=$matches[1];

					# determine headline level for wikimarkup headings
					if(strpos($hlevel,'=')!==false) {
						$hlevel=strlen($hlevel);
					}

					$secs[$section*2-1]=''; // erase old headline
					$count=$section+1;
					$break=false;
					while(!empty($secs[$count*2-1]) && !$break) {

						$subheadline=$secs[$count*2-1];
						preg_match(
						 '/^(=+).*?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>/mi',$subheadline,$matches);
						$subhlevel=$matches[1];
						if(strpos($subhlevel,'=')!==false) {
							$subhlevel=strlen($subhlevel);
						}
						if($subhlevel > $hlevel) {
							// erase old subsections
							$secs[$count*2-1]='';
							$secs[$count*2]='';
						}
						if($subhlevel <= $hlevel) {
							$break=true;
						}
						$count++;

					}

				}
				$text=join('',$secs);
				# reinsert the stuff that we stripped out earlier
				$text=$parser->unstrip($text,$striparray);
				$text=$parser->unstripNoWiki($text,$striparray);
			}

		}
		return $text;
	}

	function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' )
	{
		global $wgOut, $wgUser, $wgLinkCache;
		global $wgDBtransactions, $wgMwRedir;
		global $wgUseSquid, $wgInternalServer;
		global $wgIsPg;
		$fname = 'Article::updateArticle';

		if ( $this->mMinorEdit ) { $me1 = 1; } else { $me1 = 0; }
		if ( $minor && $wgUser->getID() ) { $me2 = 1; } else { $me2 = 0; }
		if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ')[^\\n]+)/i', $text, $m ) ) {
			$redir = 1;
			$text = $m[1] . "\n"; # Remove all content but redirect
		}
		else { $redir = 0; }

		$text = $this->preSaveTransform( $text );

		# Update article, but only if changed.

		if( $wgDBtransactions ) {
			$sql = 'BEGIN';
			wfQuery( $sql, DB_WRITE );
		}
		$oldtext = $this->getContent( true );

		if ( 0 != strcmp( $text, $oldtext ) ) {
			$this->mCountAdjustment = $this->isCountable( $text )
			  - $this->isCountable( $oldtext );

			$now = wfTimestampNow();
			$won = wfInvertTimestamp( $now );
			$sql = "UPDATE cur SET cur_text='" . wfStrencode( $text ) .
			  "',cur_comment='" .  wfStrencode( $summary ) .
			  "',cur_minor_edit={$me2}, cur_user=" . $wgUser->getID() .
			  ",cur_timestamp='{$now}',cur_user_text='" .
			  wfStrencode( $wgUser->getName() ) .
			  "',cur_is_redirect={$redir}, cur_is_new=0, cur_touched='{$now}', inverse_timestamp='{$won}' " .
			  "WHERE cur_id=" . $this->getID() .
			  " AND cur_timestamp='" . $this->getTimestamp() . "'";
			$res = wfQuery( $sql, DB_WRITE, $fname );

			if( wfAffectedRows() == 0 ) {
				/* Belated edit conflict! Run away!! */
				return false;
			}

			# This overwrites $oldtext if revision compression is on
			$flags = Article::compressRevisionText( $oldtext );

			$oldtable=$wgIsPg?'"old"':'old';
			if ($wgIsPg) {
				$oldtable='"old"';
				$old_id_column='old_id,';
				$old_id=wfGetSQL(""," nextval('old_old_id_seq')");
				$old_id_value=$old_id.',';
			} else {
				$oldtable='old';
				$old_id_column='';
				$old_id_value='';
			}

			$sql = "INSERT INTO $oldtable ({$old_id_column}old_namespace,old_title,old_text," .
			  'old_comment,old_user,old_user_text,old_timestamp,' .
			  'old_minor_edit,inverse_timestamp,old_flags) VALUES (' .
			  $old_id_value.
			  $this->mTitle->getNamespace() . ", '" .
			  wfStrencode( $this->mTitle->getDBkey() ) . "', '" .
			  wfStrencode( $oldtext ) . "', '" .
			  wfStrencode( $this->getComment() ) . "', " .
			  $this->getUser() . ", '" .
			  wfStrencode( $this->getUserText() ) . "', '" .
			  $this->getTimestamp() . "', " . $me1 . ", '" .
			  wfInvertTimestamp( $this->getTimestamp() ) . "','$flags')";
			$res = wfQuery( $sql, DB_WRITE, $fname );

			$oldid = $wgIsPg?$old_id:wfInsertId( $res );

			$bot = (int)($wgUser->isBot() || $forceBot);
			RecentChange::notifyEdit( $now, $this->mTitle, $me2, $wgUser, $summary,
				$oldid, $this->getTimestamp(), $bot );
			Article::onArticleEdit( $this->mTitle );
		}

		if( $wgDBtransactions ) {
			$sql = 'COMMIT';
			wfQuery( $sql, DB_WRITE );
		}

		if ($watchthis) {
			if (!$this->mTitle->userIsWatching()) $this->watch();
		} else {
			if ( $this->mTitle->userIsWatching() ) {
				$this->unwatch();
			}
		}
		# standard deferred updates
		$this->editUpdates( $text );


		$urls = array();
		# Template namespace
		# Purge all articles linking here
		if ( $this->mTitle->getNamespace() == NS_TEMPLATE) {
			$titles = $this->mTitle->getLinksTo();
			Title::touchArray( $titles );
			if ( $wgUseSquid ) {
				foreach ( $titles as $title ) {
					$urls[] = $title->getInternalURL();
				}
			}
		}

		# Squid updates
		if ( $wgUseSquid ) {
			$urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
			$u = new SquidUpdate( $urls );
			$u->doUpdate();
		}

		$this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor );
		return true;
	}

	# After we've either updated or inserted the article, update
	# the link tables and redirect to the new page.

	function showArticle( $text, $subtitle , $sectionanchor = '' )
	{
		global $wgOut, $wgUser, $wgLinkCache;
		global $wgMwRedir;

		$wgLinkCache = new LinkCache();

		# Get old version of link table to allow incremental link updates
		$wgLinkCache->preFill( $this->mTitle );
		$wgLinkCache->clear();

		# Now update the link cache by parsing the text
		$wgOut = new OutputPage();
		$wgOut->addWikiText( $text );

		if( $wgMwRedir->matchStart( $text ) )
			$r = 'redirect=no';
		else
			$r = '';
		$wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
	}

	# Add this page to my watchlist

	function watch( $add = true )
	{
		global $wgUser, $wgOut, $wgLang;
		global $wgDeferredUpdateList;

		if ( 0 == $wgUser->getID() ) {
			$wgOut->errorpage( 'watchnologin', 'watchnologintext' );
			return;
		}
		if ( wfReadOnly() ) {
			$wgOut->readOnlyPage();
			return;
		}
		if( $add )
			$wgUser->addWatch( $this->mTitle );
		else
			$wgUser->removeWatch( $this->mTitle );

		$wgOut->setPagetitle( wfMsg( $add ? 'addedwatch' : 'removedwatch' ) );
		$wgOut->setRobotpolicy( 'noindex,follow' );

		$sk = $wgUser->getSkin() ;
		$link = $this->mTitle->getPrefixedText();

		if($add)
			$text = wfMsg( 'addedwatchtext', $link );
		else
			$text = wfMsg( 'removedwatchtext', $link );
		$wgOut->addWikiText( $text );

		$up = new UserUpdate();
		array_push( $wgDeferredUpdateList, $up );

		$wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
	}

	function unwatch()
	{
		$this->watch( false );
	}

	function protect( $limit = 'sysop' )
	{
		global $wgUser, $wgOut, $wgRequest;

		if ( ! $wgUser->isSysop() ) {
			$wgOut->sysopRequired();
			return;
		}
		if ( wfReadOnly() ) {
			$wgOut->readOnlyPage();
			return;
		}
		$id = $this->mTitle->getArticleID();
		if ( 0 == $id ) {
			$wgOut->fatalError( wfMsg( 'badarticleerror' ) );
			return;
		}

		$confirm = $wgRequest->getBool( 'wpConfirmProtect' ) &&
			$wgRequest->wasPosted() &&
			$wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
		$reason = $wgRequest->getText( 'wpReasonProtect' );

		if ( $confirm ) {

			$sql = "UPDATE cur SET cur_touched='" . wfTimestampNow() . "'," .
				"cur_restrictions='{$limit}' WHERE cur_id={$id}";
			wfQuery( $sql, DB_WRITE, 'Article::protect' );

			$log = new LogPage( wfMsg( 'protectlogpage' ), wfMsg( 'protectlogtext' ) );
			if ( $limit === "" ) {
					$log->addEntry( wfMsg( 'unprotectedarticle', $this->mTitle->getPrefixedText() ), $reason );
			} else {
					$log->addEntry( wfMsg( 'protectedarticle', $this->mTitle->getPrefixedText() ), $reason );
			}
			$wgOut->redirect( $this->mTitle->getFullURL() );
			return;
		} else {
			$reason = htmlspecialchars( wfMsg( 'protectreason' ) );
			return $this->confirmProtect( '', $reason, $limit );
		}
	}

		# Output protection confirmation dialog
	function confirmProtect( $par, $reason, $limit = 'sysop'  )
	{
		global $wgOut, $wgUser;

		wfDebug( "Article::confirmProtect\n" );

		$sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
		$wgOut->setRobotpolicy( 'noindex,nofollow' );

		$check = '';
		$protcom = '';

		if ( $limit === '' ) {
			$wgOut->setPageTitle( wfMsg( 'confirmunprotect' ) );
			$wgOut->setSubtitle( wfMsg( 'unprotectsub', $sub ) );
			$wgOut->addWikiText( wfMsg( 'confirmunprotecttext' ) );
			$check = htmlspecialchars( wfMsg( 'confirmunprotect' ) );
			$protcom = htmlspecialchars( wfMsg( 'unprotectcomment' ) );
			$formaction = $this->mTitle->escapeLocalURL( 'action=unprotect' . $par );
		} else {
			$wgOut->setPageTitle( wfMsg( 'confirmprotect' ) );
			$wgOut->setSubtitle( wfMsg( 'protectsub', $sub ) );
			$wgOut->addWikiText( wfMsg( 'confirmprotecttext' ) );
			$check = htmlspecialchars( wfMsg( 'confirmprotect' ) );
			$protcom = htmlspecialchars( wfMsg( 'protectcomment' ) );
			$formaction = $this->mTitle->escapeLocalURL( 'action=protect' . $par );
		}

		$confirm = htmlspecialchars( wfMsg( 'confirm' ) );
		$token = htmlspecialchars( $wgUser->editToken() );

		$wgOut->addHTML( "
<form id='protectconfirm' method='post' action=\"{$formaction}\">
	<table border='0'>
		<tr>
			<td align='right'>
				<label for='wpReasonProtect'>{$protcom}:</label>
			</td>
			<td align='left'>
				<input type='text' size='60' name='wpReasonProtect' id='wpReasonProtect' value=\"" . htmlspecialchars( $reason ) . "\" />
			</td>
		</tr>
		<tr>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td align='right'>
				<input type='checkbox' name='wpConfirmProtect' value='1' id='wpConfirmProtect' />
			</td>
			<td>
				<label for='wpConfirmProtect'>{$check}</label>
			</td>
		</tr>
		<tr>
			<td>&nbsp;</td>
			<td>
				<input type='submit' name='wpConfirmProtectB' value=\"{$confirm}\" />
			</td>
		</tr>
	</table>
	<input type='hidden' name='wpEditToken' value=\"{$token}\" />
</form>\n" );

		$wgOut->returnToMain( false );
	}

	function unprotect()
	{
		return $this->protect( '' );
	}

	# UI entry point for page deletion
	function delete()
	{
		global $wgUser, $wgOut, $wgMessageCache, $wgRequest, $wgIsPg;
		$fname = 'Article::delete';
		$confirm = $wgRequest->getBool( 'wpConfirm' ) &&
			$wgRequest->wasPosted() &&
			$wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
		$reason = $wgRequest->getText( 'wpReason' );

		# This code desperately needs to be totally rewritten

		# Check permissions
		if ( ( ! $wgUser->isSysop() ) ) {
			$wgOut->sysopRequired();
			return;
		}
		if ( wfReadOnly() ) {
			$wgOut->readOnlyPage();
			return;
		}

		# Better double-check that it hasn't been deleted yet!
		$wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
		if ( ( '' == trim( $this->mTitle->getText() ) )
		  or ( $this->mTitle->getArticleId() == 0 ) ) {
			$wgOut->fatalError( wfMsg( 'cannotdelete' ) );
			return;
		}

		if ( $confirm ) {
			$this->doDelete( $reason );
			return;
		}

		# determine whether this page has earlier revisions
		# and insert a warning if it does
		# we select the text because it might be useful below
		$ns = $this->mTitle->getNamespace();
		$title = $this->mTitle->getDBkey();
		$etitle = wfStrencode( $title );
		$oldtable=$wgIsPg?'"old"':'old';
		$sql = "SELECT old_text,old_flags FROM $oldtable WHERE old_namespace=$ns and old_title='$etitle' ORDER BY inverse_timestamp LIMIT 1";
		$res = wfQuery( $sql, DB_READ, $fname );
		if( ($old=wfFetchObject($res)) && !$confirm ) {
			$skin=$wgUser->getSkin();
			$wgOut->addHTML('<b>'.wfMsg('historywarning'));
			$wgOut->addHTML( $skin->historyLink() .'</b>');
		}

		$sql="SELECT cur_text FROM cur WHERE cur_namespace=$ns and cur_title='$etitle'";
		$res=wfQuery($sql, DB_READ, $fname);
		if( ($s=wfFetchObject($res))) {

			# if this is a mini-text, we can paste part of it into the deletion reason

			#if this is empty, an earlier revision may contain "useful" text
			$blanked = false;
			if($s->cur_text!="") {
				$text=$s->cur_text;
			} else {
				if($old) {
					$text = Article::getRevisionText( $old );
					$blanked = true;
				}

			}

			$length=strlen($text);

			# this should not happen, since it is not possible to store an empty, new
			# page. Let's insert a standard text in case it does, though
			if($length == 0 && $reason === '') {
				$reason = wfMsg('exblank');
			}

			if($length < 500 && $reason === '') {

				# comment field=255, let's grep the first 150 to have some user
				# space left
				$text=substr($text,0,150);
				# let's strip out newlines and HTML tags
				$text=preg_replace('/\"/',"'",$text);
				$text=preg_replace('/\</','&lt;',$text);
				$text=preg_replace('/\>/','&gt;',$text);
				$text=preg_replace("/[\n\r]/",'',$text);
				if(!$blanked) {
					$reason=wfMsg('excontent'). " '".$text;
				} else {
					$reason=wfMsg('exbeforeblank') . " '".$text;
				}
				if($length>150) { $reason .= '...'; } # we've only pasted part of the text
				$reason.="'";
			}
		}

		return $this->confirmDelete( '', $reason );
	}

	# Output deletion confirmation dialog
	function confirmDelete( $par, $reason )
	{
		global $wgOut, $wgUser;

		wfDebug( "Article::confirmDelete\n" );

		$sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
		$wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
		$wgOut->setRobotpolicy( 'noindex,nofollow' );
		$wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );

		$formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );

		$confirm = htmlspecialchars( wfMsg( 'confirm' ) );
		$check = htmlspecialchars( wfMsg( 'confirmcheck' ) );
		$delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
		$token = htmlspecialchars( $wgUser->editToken() );

		$wgOut->addHTML( "
<form id='deleteconfirm' method='post' action=\"{$formaction}\">
	<table border='0'>
		<tr>
			<td align='right'>
				<label for='wpReason'>{$delcom}:</label>
			</td>
			<td align='left'>
				<input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
			</td>
		</tr>
		<tr>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td align='right'>
				<input type='checkbox' name='wpConfirm' value='1' id='wpConfirm' />
			</td>
			<td>
				<label for='wpConfirm'>{$check}</label>
			</td>
		</tr>
		<tr>
			<td>&nbsp;</td>
			<td>
				<input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
			</td>
		</tr>
	</table>
	<input type='hidden' name='wpEditToken' value=\"{$token}\" />
</form>\n" );

		$wgOut->returnToMain( false );
	}

	# Perform a deletion and output success or failure messages
	function doDelete( $reason )
	{
		global $wgOut, $wgUser, $wgLang;
		$fname = 'Article::doDelete';
		wfDebug( "$fname\n" );

		if ( $this->doDeleteArticle( $reason ) ) {
			$deleted = $this->mTitle->getPrefixedText();

			$wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
			$wgOut->setRobotpolicy( 'noindex,nofollow' );

			$sk = $wgUser->getSkin();
			$loglink = $sk->makeKnownLink( $wgLang->getNsText(
			  Namespace::getWikipedia() ) .
			  ':' . wfMsg( 'dellogpage' ), wfMsg( 'deletionlog' ) );

			$text = wfMsg( "deletedtext", $deleted, $loglink );

			$wgOut->addHTML( '<p>' . $text . "</p>\n" );
			$wgOut->returnToMain( false );
		} else {
			$wgOut->fatalError( wfMsg( 'cannotdelete' ) );
		}
	}

	# Back-end article deletion
	# Deletes the article with database consistency, writes logs, purges caches
	# Returns success
	function doDeleteArticle( $reason )
	{
		global $wgUser, $wgLang;
		global  $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;

		$fname = 'Article::doDeleteArticle';
		wfDebug( $fname."\n" );

		$ns = $this->mTitle->getNamespace();
		$t = wfStrencode( $this->mTitle->getDBkey() );
		$id = $this->mTitle->getArticleID();

		if ( '' == $t || $id == 0 ) {
			return false;
		}

		$u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ) );
		array_push( $wgDeferredUpdateList, $u );

		$linksTo = $this->mTitle->getLinksTo();

		# Squid purging
		if ( $wgUseSquid ) {
			$urls = array(
				$this->mTitle->getInternalURL(),
				$this->mTitle->getInternalURL( 'history' )
			);
			foreach ( $linksTo as $linkTo ) {
				$urls[] = $linkTo->getInternalURL();
			}

			$u = new SquidUpdate( $urls );
			array_push( $wgDeferredUpdateList, $u );

		}

		# Client and file cache invalidation
		Title::touchArray( $linksTo );

		# Move article and history to the "archive" table
		$sql = 'INSERT INTO archive (ar_namespace,ar_title,ar_text,' .
		  'ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit,' .
		  'ar_flags) SELECT cur_namespace,cur_title,cur_text,cur_comment,' .
		  'cur_user,cur_user_text,cur_timestamp,cur_minor_edit,0 FROM cur ' .
		  "WHERE cur_namespace={$ns} AND cur_title='{$t}'";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = 'INSERT INTO archive (ar_namespace,ar_title,ar_text,' .
		  'ar_comment,ar_user,ar_user_text,ar_timestamp,ar_minor_edit,' .
		  'ar_flags) SELECT old_namespace,old_title,old_text,old_comment,' .
		  'old_user,old_user_text,old_timestamp,old_minor_edit,old_flags ' .
		  "FROM old WHERE old_namespace={$ns} AND old_title='{$t}'";
		wfQuery( $sql, DB_WRITE, $fname );

		# Now that it's safely backed up, delete it

		$sql = "DELETE FROM cur WHERE cur_namespace={$ns} AND " .
		  "cur_title='{$t}'";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = "DELETE FROM old WHERE old_namespace={$ns} AND " .
		  "old_title='{$t}'";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = "DELETE FROM recentchanges WHERE rc_namespace={$ns} AND " .
		  "rc_title='{$t}'";
       		wfQuery( $sql, DB_WRITE, $fname );

		# Finally, clean up the link tables
		$t = wfStrencode( $this->mTitle->getPrefixedDBkey() );

		Article::onArticleDelete( $this->mTitle );

		$sql = 'INSERT INTO brokenlinks (bl_from,bl_to) VALUES ';
		$first = true;

		foreach ( $linksTo as $titleObj ) {
			if ( ! $first ) { $sql .= ','; }
			$first = false;
			# Get article ID. Efficient because it was loaded into the cache by getLinksTo().
			$linkID = $titleObj->getArticleID();
			$sql .= "({$linkID},'{$t}')";
		}
		if ( ! $first ) {
			wfQuery( $sql, DB_WRITE, $fname );
		}

		$sql = "DELETE FROM links WHERE l_to={$id}";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = "DELETE FROM links WHERE l_from={$id}";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = "DELETE FROM imagelinks WHERE il_from={$id}";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = "DELETE FROM brokenlinks WHERE bl_from={$id}";
		wfQuery( $sql, DB_WRITE, $fname );

		$sql = "DELETE FROM categorylinks WHERE cl_from={$id}";
		wfQuery( $sql, DB_WRITE, $fname );

		$log = new LogPage( wfMsg( 'dellogpage' ), wfMsg( 'dellogpagetext' ) );
		$art = $this->mTitle->getPrefixedText();
		$log->addEntry( wfMsg( 'deletedarticle', $art ), $reason );

		# Clear the cached article id so the interface doesn't act like we exist
		$this->mTitle->resetArticleID( 0 );
		$this->mTitle->mArticleID = 0;
		return true;
	}

	function rollback()
	{
		global $wgUser, $wgLang, $wgOut, $wgRequest, $wgIsMySQL, $wgIsPg;

		if ( ! $wgUser->isSysop() ) {
			$wgOut->sysopRequired();
			return;
		}
		if ( wfReadOnly() ) {
			$wgOut->readOnlyPage( $this->getContent( true ) );
			return;
		}
		if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
			array( $this->mTitle->getPrefixedText(),
				$wgRequest->getVal( 'from' ) )  ) ) {
			$wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
			$wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
			return;
		}

		# Enhanced rollback, marks edits rc_bot=1
		$bot = $wgRequest->getBool( 'bot' );

		# Replace all this user's current edits with the next one down
		$tt = wfStrencode( $this->mTitle->getDBKey() );
		$n = $this->mTitle->getNamespace();

		# Get the last editor
		$sql = 'SELECT cur_id,cur_user,cur_user_text,cur_comment ' .
		       "FROM cur WHERE cur_title='{$tt}' AND cur_namespace={$n}";
		$res = wfQuery( $sql, DB_READ );
		if( ($x = wfNumRows( $res )) != 1 ) {
			# Something wrong
			$wgOut->addHTML( wfMsg( 'notanarticle' ) );
			return;
		}
		$s = wfFetchObject( $res );
		$ut = wfStrencode( $s->cur_user_text );
		$uid = $s->cur_user;
		$pid = $s->cur_id;

		$from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
		if( $from != $s->cur_user_text ) {
			$wgOut->setPageTitle(wfmsg('rollbackfailed'));
			$wgOut->addWikiText( wfMsg( 'alreadyrolled',
				htmlspecialchars( $this->mTitle->getPrefixedText()),
				htmlspecialchars( $from ),
				htmlspecialchars( $s->cur_user_text ) ) );
			if($s->cur_comment != '') {
				$wgOut->addHTML(
					wfMsg('editcomment',
					htmlspecialchars( $s->cur_comment ) ) );
			}
			return;
		}

		# Get the last edit not by this guy

		$use_index=$wgIsMySQL?"USE INDEX (name_title_timestamp)":"";
		$oldtable=$wgIsPg?'"old"':'old';
		$sql = 'SELECT old_text,old_user,old_user_text,old_timestamp,old_flags ' .
		"FROM $oldtable {$use_index} " .
		"WHERE old_namespace={$n} AND old_title='{$tt}' " .
		"AND (old_user <> {$uid} OR old_user_text <> '{$ut}') " .
		'ORDER BY inverse_timestamp LIMIT 1';
		$res = wfQuery( $sql, DB_READ );
		if( wfNumRows( $res ) != 1 ) {
			# Something wrong
			$wgOut->setPageTitle(wfMsg('rollbackfailed'));
			$wgOut->addHTML( wfMsg( 'cantrollback' ) );
			return;
		}
		$s = wfFetchObject( $res );

		if ( $bot ) {
			# Mark all reverted edits as bot
			$sql = 'UPDATE recentchanges SET rc_bot=1 WHERE ' .
				"rc_cur_id=$pid AND rc_user=$uid AND rc_timestamp > '{$s->old_timestamp}'";
			wfQuery( $sql, DB_WRITE, $fname );
		}

		# Save it!
		$newcomment = wfMsg( 'revertpage', $s->old_user_text, $from );
		$wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
		$wgOut->setRobotpolicy( 'noindex,nofollow' );
		$wgOut->addHTML( '<h2>' . htmlspecialchars( $newcomment ) . "</h2>\n<hr />\n" );
		$this->updateArticle( Article::getRevisionText( $s ), $newcomment, 1, $this->mTitle->userIsWatching(), $bot );
		Article::onArticleEdit( $this->mTitle );
		$wgOut->returnToMain( false );
	}


	# Do standard deferred updates after page view

	/* private */ function viewUpdates()
	{
		global $wgDeferredUpdateList;
		if ( 0 != $this->getID() ) {
			global $wgDisableCounters;
			if( !$wgDisableCounters ) {
				Article::incViewCount( $this->getID() );
				$u = new SiteStatsUpdate( 1, 0, 0 );
				array_push( $wgDeferredUpdateList, $u );
			}
		}
		$u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(),
		  $this->mTitle->getDBkey() );
		array_push( $wgDeferredUpdateList, $u );
	}

	# Do standard deferred updates after page edit.
	# Every 1000th edit, prune the recent changes table.

	/* private */ function editUpdates( $text )
	{
		global $wgDeferredUpdateList, $wgDBname, $wgMemc;
		global $wgMessageCache;

		wfSeedRandom();
		if ( 0 == mt_rand( 0, 999 ) ) {
			$cutoff = wfUnix2Timestamp( time() - ( 7 * 86400 ) );
			$sql = "DELETE FROM recentchanges WHERE rc_timestamp < '{$cutoff}'";
			wfQuery( $sql, DB_WRITE );
		}
		$id = $this->getID();
		$title = $this->mTitle->getPrefixedDBkey();
		$shortTitle = $this->mTitle->getDBkey();

		$adj = $this->mCountAdjustment;

		if ( 0 != $id ) {
			$u = new LinksUpdate( $id, $title );
			array_push( $wgDeferredUpdateList, $u );
			$u = new SiteStatsUpdate( 0, 1, $adj );
			array_push( $wgDeferredUpdateList, $u );
			$u = new SearchUpdate( $id, $title, $text );
			array_push( $wgDeferredUpdateList, $u );

			$u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle );
			array_push( $wgDeferredUpdateList, $u );

			if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
				$wgMessageCache->replace( $shortTitle, $text );
			}
		}
	}

	/* private */ function setOldSubtitle()
	{
		global $wgLang, $wgOut;

		$td = $wgLang->timeanddate( $this->mTimestamp, true );
		$r = wfMsg( 'revisionasof', $td );
		$wgOut->setSubtitle( "({$r})" );
	}

	# This function is called right before saving the wikitext,
	# so we can do things like signatures and links-in-context.

	function preSaveTransform( $text )
	{
		global $wgParser, $wgUser;
		return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
	}

	/* Caching functions */

	# checkLastModified returns true if it has taken care of all
	# output to the client that is necessary for this request.
	# (that is, it has sent a cached version of the page)
	function tryFileCache() {
		static $called = false;
		if( $called ) {
			wfDebug( " tryFileCache() -- called twice!?\n" );
			return;
		}
		$called = true;
		if($this->isFileCacheable()) {
			$touched = $this->mTouched;
			if( $this->mTitle->getPrefixedDBkey() == wfMsg( 'mainpage' ) ) {
				# Expire the main page quicker
				$expire = wfUnix2Timestamp( time() - 3600 );
				$touched = max( $expire, $touched );
			}
			$cache = new CacheManager( $this->mTitle );
			if($cache->isFileCacheGood( $touched )) {
				global $wgOut;
				wfDebug( " tryFileCache() - about to load\n" );
				$cache->loadFromFileCache();
				return true;
			} else {
				wfDebug( " tryFileCache() - starting buffer\n" );
				ob_start( array(&$cache, 'saveToFileCache' ) );
			}
		} else {
			wfDebug( " tryFileCache() - not cacheable\n" );
		}
	}

	function isFileCacheable() {
		global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
		extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );

		return $wgUseFileCache
			and (!$wgShowIPinHeader)
			and ($this->getID() != 0)
			and ($wgUser->getId() == 0)
			and (!$wgUser->getNewtalk())
			and ($this->mTitle->getNamespace() != Namespace::getSpecial())
			and (empty ( $action ) || $action == 'view')
			and (!isset($oldid))
			and (!isset($diff))
			and (!isset($redirect))
			and (!isset($printable))
			and (!$this->mRedirectedFrom);
	}

	# Loads cur_touched and returns a value indicating if it should be used
	function checkTouched() {
		$id = $this->getID();
		$sql = 'SELECT cur_touched,cur_is_redirect FROM cur WHERE cur_id='.$id;
		$res = wfQuery( $sql, DB_READ, 'Article::checkTouched' );
		if( $s = wfFetchObject( $res ) ) {
			$this->mTouched = $s->cur_touched;
			return !$s->cur_is_redirect;
		} else {
			return false;
		}
	}

	# Edit an article without doing all that other stuff
	function quickEdit( $text, $comment = '', $minor = 0 ) {
		global $wgUser, $wgMwRedir, $wgIsPg;
		$fname = 'Article::quickEdit';
		wfProfileIn( $fname );

		$ns = $this->mTitle->getNamespace();
		$dbkey = $this->mTitle->getDBkey();
		$encDbKey = wfStrencode( $dbkey );
		$timestamp = wfTimestampNow();

		# Save to history
                $oldtable=$wgIsPg?'"old"':'old';
		$sql = "INSERT INTO $oldtable (old_namespace,old_title,old_text,old_comment,old_user,old_user_text,old_timestamp,inverse_timestamp)
		  SELECT cur_namespace,cur_title,cur_text,cur_comment,cur_user,cur_user_text,cur_timestamp,99999999999999-cur_timestamp
		  FROM cur WHERE cur_namespace=$ns AND cur_title='$encDbKey'";
		wfQuery( $sql, DB_WRITE );

		# Use the affected row count to determine if the article is new
		$numRows = wfAffectedRows();

		# Make an array of fields to be inserted
		$fields = array(
			'cur_text' => $text,
			'cur_timestamp' => $timestamp,
			'cur_user' => $wgUser->getID(),
			'cur_user_text' => $wgUser->getName(),
			'inverse_timestamp' => wfInvertTimestamp( $timestamp ),
			'cur_comment' => $comment,
			'cur_is_redirect' => $wgMwRedir->matchStart( $text ) ? 1 : 0,
			'cur_minor_edit' => intval($minor),
			'cur_touched' => $timestamp,
		);

		if ( $numRows ) {
			# Update article
			$fields['cur_is_new'] = 0;
			wfUpdateArray( 'cur', $fields, array( 'cur_namespace' => $ns, 'cur_title' => $dbkey ), $fname );
		} else {
			# Insert new article
			$fields['cur_is_new'] = 1;
			$fields['cur_namespace'] = $ns;
			$fields['cur_title'] = $dbkey;
			$fields['cur_random'] = $rand = number_format( mt_rand() / mt_getrandmax(), 12, '.', '' );
			wfInsertArray( 'cur', $fields, $fname );
		}
		wfProfileOut( $fname );
	}

	/* static */ function incViewCount( $id )
	{
		$id = intval( $id );
		global $wgHitcounterUpdateFreq;

		if( $wgHitcounterUpdateFreq <= 1 ){ //
			wfQuery('UPDATE cur SET cur_counter = cur_counter + 1 ' .
				'WHERE cur_id = '.$id, DB_WRITE);
			return;
		}

		# Not important enough to warrant an error page in case of failure
		$oldignore = wfIgnoreSQLErrors( true );

		wfQuery("INSERT INTO hitcounter (hc_id) VALUES ({$id})", DB_WRITE);

		$checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
		if( (rand() % $checkfreq != 0) or (wfLastErrno() != 0) ){
			# Most of the time (or on SQL errors), skip row count check
			wfIgnoreSQLErrors( $oldignore );
			return;
		}

		$res = wfQuery('SELECT COUNT(*) as n FROM hitcounter', DB_WRITE);
		$row = wfFetchObject( $res );
		$rown = intval( $row->n );
		if( $rown >= $wgHitcounterUpdateFreq ){
			wfProfileIn( 'Article::incViewCount-collect' );
			$old_user_abort = ignore_user_abort( true );

			wfQuery('LOCK TABLES hitcounter WRITE', DB_WRITE);
			wfQuery('CREATE TEMPORARY TABLE acchits TYPE=HEAP '.
				'SELECT hc_id,COUNT(*) AS hc_n FROM hitcounter '.
				'GROUP BY hc_id', DB_WRITE);
			wfQuery('DELETE FROM hitcounter', DB_WRITE);
			wfQuery('UNLOCK TABLES', DB_WRITE);
			wfQuery('UPDATE cur,acchits SET cur_counter=cur_counter + hc_n '.
				'WHERE cur_id = hc_id', DB_WRITE);
			wfQuery('DROP TABLE acchits', DB_WRITE);

			ignore_user_abort( $old_user_abort );
			wfProfileOut( 'Article::incViewCount-collect' );
		}
		wfIgnoreSQLErrors( $oldignore );
	}

	# The onArticle*() functions are supposed to be a kind of hooks
	# which should be called whenever any of the specified actions
	# are done.
	#
	# This is a good place to put code to clear caches, for instance.

	# This is called on page move and undelete, as well as edit
	/* static */ function onArticleCreate($title_obj){
		global $wgUseSquid, $wgDeferredUpdateList;

		$titles = $title_obj->getBrokenLinksTo();

		# Purge squid
		if ( $wgUseSquid ) {
			$urls = $title_obj->getSquidURLs();
			foreach ( $titles as $linkTitle ) {
				$urls[] = $linkTitle->getInternalURL();
			}
			$u = new SquidUpdate( $urls );
			array_push( $wgDeferredUpdateList, $u );
		}

		# Clear persistent link cache
		LinkCache::linksccClearBrokenLinksTo( $title_obj->getPrefixedDBkey() );
	}

	/* static */ function onArticleDelete($title_obj){
		LinkCache::linksccClearLinksTo( $title_obj->getArticleID() );
	}

	/* static */ function onArticleEdit($title_obj){
		LinkCache::linksccClearPage( $title_obj->getArticleID() );
	}

	# Info about this page

	function info()
	{
		global $wgUser, $wgTitle, $wgOut, $wgLang, $wgAllowPageInfo;

		if ( !$wgAllowPageInfo ) {
			$wgOut->errorpage( "nosuchaction", "nosuchactiontext" );
			return;
		}

		$basenamespace = $wgTitle->getNamespace() & (~1);
		$cur_clause = "cur_title='".$wgTitle->getDBkey()."' AND cur_namespace=".$basenamespace;
		$old_clause = "old_title='".$wgTitle->getDBkey()."' AND old_namespace=".$basenamespace;
		$wl_clause  =  "wl_title='".$wgTitle->getDBkey()."' AND  wl_namespace=".$basenamespace;
		$fullTitle = $wgTitle->makeName($basenamespace, $wgTitle->getDBKey());
		$wgOut->setPagetitle(  $fullTitle );
		$wgOut->setSubtitle( wfMsg( "infosubtitle" ));

		# first, see if the page exists at all.
		$sql = "SELECT COUNT(*) FROM cur WHERE ".$cur_clause;
		$exists = wfSingleQuery( $sql , DB_READ );
		if ($exists < 1) {
			$wgOut->addHTML( wfMsg("noarticletext") );
		} else {
			$sql = "SELECT COUNT(*) FROM watchlist WHERE ".$wl_clause;
			$wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers") . wfSingleQuery( $sql, DB_READ ) . "</li>" );
			$sql = "SELECT COUNT(*) FROM old WHERE ".$old_clause;
			$old = wfSingleQuery( $sql, DB_READ );
			$wgOut->addHTML( "<li>" . wfMsg("numedits") . ($old + 1) . "</li>");

			# to find number of distinct authors, we need to do some
			# funny stuff because of the cur/old table split:
			# - first, find the name of the 'cur' author
			# - then, find the number of *other* authors in 'old'

			# find 'cur' author
			$sql = "SELECT cur_user_text FROM cur WHERE ".$cur_clause;
			$cur_author = wfSingleQuery( $sql, DB_READ );

			# find number of 'old' authors excluding 'cur' author
			$sql = "SELECT COUNT(DISTINCT old_user_text) FROM old WHERE ".$old_clause
					." AND old_user_text<>'" . $cur_author . "'";
			$authors = wfSingleQuery( $sql, DB_READ ) + 1;

			# now for the Talk page ...
			$cur_clause = "cur_title='".$wgTitle->getDBkey()."' AND cur_namespace=".($basenamespace+1);
			$old_clause = "old_title='".$wgTitle->getDBkey()."' AND old_namespace=".($basenamespace+1);

			# does it exist?
			$sql = "SELECT COUNT(*) FROM cur WHERE ".$cur_clause;
			$exists = wfSingleQuery( $sql , DB_READ );

			# number of edits
			if ($exists > 0) {
				$sql = "SELECT COUNT(*) FROM old WHERE ".$old_clause;
				$old = wfSingleQuery( $sql, DB_READ );
				$wgOut->addHTML( "<li>" . wfMsg("numtalkedits") . ($old + 1) . "</li>");
			}
			$wgOut->addHTML( "<li>" . wfMsg("numauthors") . $authors . "</li>" );

			# number of authors
			if ($exists > 0) {
				$sql = "SELECT cur_user_text FROM cur WHERE ".$cur_clause;
				$cur_author = wfSingleQuery( $sql, DB_READ );

				$sql = "SELECT COUNT(DISTINCT old_user_text) FROM old WHERE "
						.$old_clause." AND old_user_text<>'" . $cur_author . "'";
				$authors = wfSingleQuery( $sql, DB_READ ) + 1;

				$wgOut->addHTML( "<li>" . wfMsg("numtalkauthors") . $authors . "</li></ul>" );
			}
		}
	}
}

?>
