/includes/EditPage.php

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<?php
/**
 * Page edition user interface.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * The edit page/HTML interface (split from Article)
 * The actual database and text munging is still in Article,
 * but it should get easier to call those from alternate
 * interfaces.
 *
 * EditPage cares about two distinct titles:
 * $this->mContextTitle is the page that forms submit to, links point to,
 * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
 * page in the database that is actually being edited. These are
 * usually the same, but they are now allowed to be different.
 *
 * Surgeon General's Warning: prolonged exposure to this class is known to cause
 * headaches, which may be fatal.
 */
class EditPage {

	/**
	 * Status: Article successfully updated
	 */
	const AS_SUCCESS_UPDATE            = 200;

	/**
	 * Status: Article successfully created
	 */
	const AS_SUCCESS_NEW_ARTICLE       = 201;

	/**
	 * Status: Article update aborted by a hook function
	 */
	const AS_HOOK_ERROR                = 210;

	/**
	 * Status: A hook function returned an error
	 */
	const AS_HOOK_ERROR_EXPECTED       = 212;

	/**
	 * Status: User is blocked from editting this page
	 */
	const AS_BLOCKED_PAGE_FOR_USER     = 215;

	/**
	 * Status: Content too big (> $wgMaxArticleSize)
	 */
	const AS_CONTENT_TOO_BIG           = 216;

	/**
	 * Status: User cannot edit? (not used)
	 */
	const AS_USER_CANNOT_EDIT          = 217;

	/**
	 * Status: this anonymous user is not allowed to edit this page
	 */
	const AS_READ_ONLY_PAGE_ANON       = 218;

	/**
	 * Status: this logged in user is not allowed to edit this page
	 */
	const AS_READ_ONLY_PAGE_LOGGED     = 219;

	/**
	 * Status: wiki is in readonly mode (wfReadOnly() == true)
	 */
	const AS_READ_ONLY_PAGE            = 220;

	/**
	 * Status: rate limiter for action 'edit' was tripped
	 */
	const AS_RATE_LIMITED              = 221;

	/**
	 * Status: article was deleted while editting and param wpRecreate == false or form
	 * was not posted
	 */
	const AS_ARTICLE_WAS_DELETED       = 222;

	/**
	 * Status: user tried to create this page, but is not allowed to do that
	 * ( Title->usercan('create') == false )
	 */
	const AS_NO_CREATE_PERMISSION      = 223;

	/**
	 * Status: user tried to create a blank page
	 */
	const AS_BLANK_ARTICLE             = 224;

	/**
	 * Status: (non-resolvable) edit conflict
	 */
	const AS_CONFLICT_DETECTED         = 225;

	/**
	 * Status: no edit summary given and the user has forceeditsummary set and the user is not
	 * editting in his own userspace or talkspace and wpIgnoreBlankSummary == false
	 */
	const AS_SUMMARY_NEEDED            = 226;

	/**
	 * Status: user tried to create a new section without content
	 */
	const AS_TEXTBOX_EMPTY             = 228;

	/**
	 * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
	 */
	const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;

	/**
	 * not used
	 */
	const AS_OK                        = 230;

	/**
	 * Status: WikiPage::doEdit() was unsuccessfull
	 */
	const AS_END                       = 231;

	/**
	 * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
	 */
	const AS_SPAM_ERROR                = 232;

	/**
	 * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
	 */
	const AS_IMAGE_REDIRECT_ANON       = 233;

	/**
	 * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
	 */
	const AS_IMAGE_REDIRECT_LOGGED     = 234;

	/**
	 * HTML id and name for the beginning of the edit form.
	 */
	const EDITFORM_ID                  = 'editform';

	/**
	 * @var Article
	 */
	var $mArticle;

	/**
	 * @var Title
	 */
	var $mTitle;
	private $mContextTitle = null;
	var $action = 'submit';
	var $isConflict = false;
	var $isCssJsSubpage = false;
	var $isCssSubpage = false;
	var $isJsSubpage = false;
	var $isWrongCaseCssJsPage = false;
	var $isNew = false; // new page or new section
	var $deletedSinceEdit;
	var $formtype;
	var $firsttime;
	var $lastDelete;
	var $mTokenOk = false;
	var $mTokenOkExceptSuffix = false;
	var $mTriedSave = false;
	var $incompleteForm = false;
	var $tooBig = false;
	var $kblength = false;
	var $missingComment = false;
	var $missingSummary = false;
	var $allowBlankSummary = false;
	var $autoSumm = '';
	var $hookError = '';
	#var $mPreviewTemplates;

	/**
	 * @var ParserOutput
	 */
	var $mParserOutput;

	/**
	 * Has a summary been preset using GET parameter &summary= ?
	 * @var Bool
	 */
	var $hasPresetSummary = false;

	var $mBaseRevision = false;
	var $mShowSummaryField = true;

	# Form values
	var $save = false, $preview = false, $diff = false;
	var $minoredit = false, $watchthis = false, $recreate = false;
	var $textbox1 = '', $textbox2 = '', $summary = '', $nosummary = false;
	var $edittime = '', $section = '', $sectiontitle = '', $starttime = '';
	var $oldid = 0, $editintro = '', $scrolltop = null, $bot = true;

	# Placeholders for text injection by hooks (must be HTML)
	# extensions should take care to _append_ to the present value
	public $editFormPageTop = ''; // Before even the preview
	public $editFormTextTop = '';
	public $editFormTextBeforeContent = '';
	public $editFormTextAfterWarn = '';
	public $editFormTextAfterTools = '';
	public $editFormTextBottom = '';
	public $editFormTextAfterContent = '';
	public $previewTextAfterContent = '';
	public $mPreloadText = '';

	/* $didSave should be set to true whenever an article was succesfully altered. */
	public $didSave = false;
	public $undidRev = 0;

	public $suppressIntro = false;

	/**
	 * @param $article Article
	 */
	public function __construct( Article $article ) {
		$this->mArticle = $article;
		$this->mTitle = $article->getTitle();
	}

	/**
	 * @return Article
	 */
	public function getArticle() {
		return $this->mArticle;
	}

	/**
	 * @since 1.19
	 * @return Title
	 */
	public function getTitle() {
		return $this->mTitle;
	}

	/**
	 * Set the context Title object
	 *
	 * @param $title Title object or null
	 */
	public function setContextTitle( $title ) {
		$this->mContextTitle = $title;
	}

	/**
	 * Get the context title object.
	 * If not set, $wgTitle will be returned. This behavior might changed in
	 * the future to return $this->mTitle instead.
	 *
	 * @return Title object
	 */
	public function getContextTitle() {
		if ( is_null( $this->mContextTitle ) ) {
			global $wgTitle;
			return $wgTitle;
		} else {
			return $this->mContextTitle;
		}
	}

	function submit() {
		$this->edit();
	}

	/**
	 * This is the function that gets called for "action=edit". It
	 * sets up various member variables, then passes execution to
	 * another function, usually showEditForm()
	 *
	 * The edit form is self-submitting, so that when things like
	 * preview and edit conflicts occur, we get the same form back
	 * with the extra stuff added.  Only when the final submission
	 * is made and all is well do we actually save and redirect to
	 * the newly-edited page.
	 */
	function edit() {
		global $wgOut, $wgRequest, $wgUser;
		// Allow extensions to modify/prevent this form or submission
		if ( !wfRunHooks( 'AlternateEdit', array( $this ) ) ) {
			return;
		}

		wfProfileIn( __METHOD__ );
		wfDebug( __METHOD__ . ": enter\n" );

		// If they used redlink=1 and the page exists, redirect to the main article
		if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
			$wgOut->redirect( $this->mTitle->getFullURL() );
			wfProfileOut( __METHOD__ );
			return;
		}

		$this->importFormData( $wgRequest );
		$this->firsttime = false;

		if ( $this->live ) {
			$this->livePreview();
			wfProfileOut( __METHOD__ );
			return;
		}

		if ( wfReadOnly() && $this->save ) {
			// Force preview
			$this->save = false;
			$this->preview = true;
		}

		if ( $this->save ) {
			$this->formtype = 'save';
		} elseif ( $this->preview ) {
			$this->formtype = 'preview';
		} elseif ( $this->diff ) {
			$this->formtype = 'diff';
		} else { # First time through
			$this->firsttime = true;
			if ( $this->previewOnOpen() ) {
				$this->formtype = 'preview';
			} else {
				$this->formtype = 'initial';
			}
		}

		$permErrors = $this->getEditPermissionErrors();
		if ( $permErrors ) {
			wfDebug( __METHOD__ . ": User can't edit\n" );
			// Auto-block user's IP if the account was "hard" blocked
			$wgUser->spreadAnyEditBlock();

			$this->displayPermissionsError( $permErrors );

			wfProfileOut( __METHOD__ );
			return;
		}

		wfProfileIn( __METHOD__ . "-business-end" );

		$this->isConflict = false;
		// css / js subpages of user pages get a special treatment
		$this->isCssJsSubpage       = $this->mTitle->isCssJsSubpage();
		$this->isCssSubpage         = $this->mTitle->isCssSubpage();
		$this->isJsSubpage          = $this->mTitle->isJsSubpage();
		$this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
		$this->isNew                = !$this->mTitle->exists() || $this->section == 'new';

		# Show applicable editing introductions
		if ( $this->formtype == 'initial' || $this->firsttime ) {
			$this->showIntro();
		}

		# Attempt submission here.  This will check for edit conflicts,
		# and redundantly check for locked database, blocked IPs, etc.
		# that edit() already checked just in case someone tries to sneak
		# in the back door with a hand-edited submission URL.

		if ( 'save' == $this->formtype ) {
			if ( !$this->attemptSave() ) {
				wfProfileOut( __METHOD__ . "-business-end" );
				wfProfileOut( __METHOD__ );
				return;
			}
		}

		# First time through: get contents, set time for conflict
		# checking, etc.
		if ( 'initial' == $this->formtype || $this->firsttime ) {
			if ( $this->initialiseForm() === false ) {
				$this->noSuchSectionPage();
				wfProfileOut( __METHOD__ . "-business-end" );
				wfProfileOut( __METHOD__ );
				return;
			}
			if ( !$this->mTitle->getArticleID() )
				wfRunHooks( 'EditFormPreloadText', array( &$this->textbox1, &$this->mTitle ) );
			else
				wfRunHooks( 'EditFormInitialText', array( $this ) );
		}

		$this->showEditForm();
		wfProfileOut( __METHOD__ . "-business-end" );
		wfProfileOut( __METHOD__ );
	}

	/**
	 * @return array
	 */
	protected function getEditPermissionErrors() {
		global $wgUser;
		$permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
		# Can this title be created?
		if ( !$this->mTitle->exists() ) {
			$permErrors = array_merge( $permErrors,
				wfArrayDiff2( $this->mTitle->getUserPermissionsErrors( 'create', $wgUser ), $permErrors ) );
		}
		# Ignore some permissions errors when a user is just previewing/viewing diffs
		$remove = array();
		foreach ( $permErrors as $error ) {
			if ( ( $this->preview || $this->diff ) &&
				( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' ) )
			{
				$remove[] = $error;
			}
		}
		$permErrors = wfArrayDiff2( $permErrors, $remove );
		return $permErrors;
	}

	/**
	 * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
	 * but with the following differences:
	 * - If redlink=1, the user will be redirected to the page
	 * - If there is content to display or the error occurs while either saving,
	 *   previewing or showing the difference, it will be a
	 *   "View source for ..." page displaying the source code after the error message.
	 *
	 * @since 1.19
	 * @param $permErrors Array of permissions errors, as returned by
	 *                    Title::getUserPermissionsErrors().
	 */
	protected function displayPermissionsError( array $permErrors ) {
		global $wgRequest, $wgOut;

		if ( $wgRequest->getBool( 'redlink' ) ) {
			// The edit page was reached via a red link.
			// Redirect to the article page and let them click the edit tab if
			// they really want a permission error.
			$wgOut->redirect( $this->mTitle->getFullUrl() );
			return;
		}

		$content = $this->getContent();

		# Use the normal message if there's nothing to display
		if ( $this->firsttime && $content === '' ) {
			$action = $this->mTitle->exists() ? 'edit' :
				( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
			throw new PermissionsError( $action, $permErrors );
		}

		$wgOut->setPageTitle( wfMessage( 'viewsource-title', $this->getContextTitle()->getPrefixedText() ) );
		$wgOut->addBacklinkSubtitle( $this->getContextTitle() );
		$wgOut->addWikiText( $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' ) );
		$wgOut->addHTML( "<hr />\n" );

		# If the user made changes, preserve them when showing the markup
		# (This happens when a user is blocked during edit, for instance)
		if ( !$this->firsttime ) {
			$content = $this->textbox1;
			$wgOut->addWikiMsg( 'viewyourtext' );
		} else {
			$wgOut->addWikiMsg( 'viewsourcetext' );
		}

		$this->showTextbox( $content, 'wpTextbox1', array( 'readonly' ) );

		$wgOut->addHTML( Html::rawElement( 'div', array( 'class' => 'templatesUsed' ),
			Linker::formatTemplates( $this->getTemplates() ) ) );

		if ( $this->mTitle->exists() ) {
			$wgOut->returnToMain( null, $this->mTitle );
		}
	}

	/**
	 * Show a read-only error
	 * Parameters are the same as OutputPage:readOnlyPage()
	 * Redirect to the article page if redlink=1
	 * @deprecated in 1.19; use displayPermissionsError() instead
	 */
	function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
		wfDeprecated( __METHOD__, '1.19' );

		global $wgRequest, $wgOut;
		if ( $wgRequest->getBool( 'redlink' ) ) {
			// The edit page was reached via a red link.
			// Redirect to the article page and let them click the edit tab if
			// they really want a permission error.
			$wgOut->redirect( $this->mTitle->getFullUrl() );
		} else {
			$wgOut->readOnlyPage( $source, $protected, $reasons, $action );
		}
	}

	/**
	 * Should we show a preview when the edit form is first shown?
	 *
	 * @return bool
	 */
	protected function previewOnOpen() {
		global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
		if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
			// Explicit override from request
			return true;
		} elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
			// Explicit override from request
			return false;
		} elseif ( $this->section == 'new' ) {
			// Nothing *to* preview for new sections
			return false;
		} elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() ) && $wgUser->getOption( 'previewonfirst' ) ) {
			// Standard preference behaviour
			return true;
		} elseif ( !$this->mTitle->exists() &&
		  isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] ) &&
		  $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
		{
			// Categories are special
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Checks whether the user entered a skin name in uppercase,
	 * e.g. "User:Example/Monobook.css" instead of "monobook.css"
	 *
	 * @return bool
	 */
	protected function isWrongCaseCssJsPage() {
		if ( $this->mTitle->isCssJsSubpage() ) {
			$name = $this->mTitle->getSkinFromCssJsSubpage();
			$skins = array_merge(
				array_keys( Skin::getSkinNames() ),
				array( 'common' )
			);
			return !in_array( $name, $skins )
				&& in_array( strtolower( $name ), $skins );
		} else {
			return false;
		}
	}

	/**
	 * Does this EditPage class support section editing?
	 * This is used by EditPage subclasses to indicate their ui cannot handle section edits
	 *
	 * @return bool
	 */
	protected function isSectionEditSupported() {
		return true;
	}

	/**
	 * This function collects the form data and uses it to populate various member variables.
	 * @param $request WebRequest
	 */
	function importFormData( &$request ) {
		global $wgLang, $wgUser;

		wfProfileIn( __METHOD__ );

		# Section edit can come from either the form or a link
		$this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );

		if ( $request->wasPosted() ) {
			# These fields need to be checked for encoding.
			# Also remove trailing whitespace, but don't remove _initial_
			# whitespace from the text boxes. This may be significant formatting.
			$this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
			if ( !$request->getCheck( 'wpTextbox2' ) ) {
				// Skip this if wpTextbox2 has input, it indicates that we came
				// from a conflict page with raw page text, not a custom form
				// modified by subclasses
				wfProfileIn( get_class( $this ) . "::importContentFormData" );
				$textbox1 = $this->importContentFormData( $request );
				if ( isset( $textbox1 ) )
					$this->textbox1 = $textbox1;
				wfProfileOut( get_class( $this ) . "::importContentFormData" );
			}

			# Truncate for whole multibyte characters
			$this->summary = $wgLang->truncate( $request->getText( 'wpSummary' ), 255 );

			# If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
			# header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
			# section titles.
			$this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );

			# Treat sectiontitle the same way as summary.
			# Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
			# currently doing double duty as both edit summary and section title. Right now this
			# is just to allow API edits to work around this limitation, but this should be
			# incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
			$this->sectiontitle = $wgLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
			$this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );

			$this->edittime = $request->getVal( 'wpEdittime' );
			$this->starttime = $request->getVal( 'wpStarttime' );

			$this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );

			if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
				// wpTextbox1 field is missing, possibly due to being "too big"
				// according to some filter rules such as Suhosin's setting for
				// suhosin.request.max_value_length (d'oh)
				$this->incompleteForm = true;
			} else {
				// edittime should be one of our last fields; if it's missing,
				// the submission probably broke somewhere in the middle.
				$this->incompleteForm = is_null( $this->edittime );
			}
			if ( $this->incompleteForm ) {
				# If the form is incomplete, force to preview.
				wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
				wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
				$this->preview = true;
			} else {
				/* Fallback for live preview */
				$this->preview = $request->getCheck( 'wpPreview' ) || $request->getCheck( 'wpLivePreview' );
				$this->diff = $request->getCheck( 'wpDiff' );

				// Remember whether a save was requested, so we can indicate
				// if we forced preview due to session failure.
				$this->mTriedSave = !$this->preview;

				if ( $this->tokenOk( $request ) ) {
					# Some browsers will not report any submit button
					# if the user hits enter in the comment box.
					# The unmarked state will be assumed to be a save,
					# if the form seems otherwise complete.
					wfDebug( __METHOD__ . ": Passed token check.\n" );
				} elseif ( $this->diff ) {
					# Failed token check, but only requested "Show Changes".
					wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
				} else {
					# Page might be a hack attempt posted from
					# an external site. Preview instead of saving.
					wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
					$this->preview = true;
				}
			}
			$this->save = !$this->preview && !$this->diff;
			if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
				$this->edittime = null;
			}

			if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
				$this->starttime = null;
			}

			$this->recreate  = $request->getCheck( 'wpRecreate' );

			$this->minoredit = $request->getCheck( 'wpMinoredit' );
			$this->watchthis = $request->getCheck( 'wpWatchthis' );

			# Don't force edit summaries when a user is editing their own user or talk page
			if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK ) &&
				$this->mTitle->getText() == $wgUser->getName() )
			{
				$this->allowBlankSummary = true;
			} else {
				$this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' ) || !$wgUser->getOption( 'forceeditsummary' );
			}

			$this->autoSumm = $request->getText( 'wpAutoSummary' );
		} else {
			# Not a posted form? Start with nothing.
			wfDebug( __METHOD__ . ": Not a posted form.\n" );
			$this->textbox1     = '';
			$this->summary      = '';
			$this->sectiontitle = '';
			$this->edittime     = '';
			$this->starttime    = wfTimestampNow();
			$this->edit         = false;
			$this->preview      = false;
			$this->save         = false;
			$this->diff         = false;
			$this->minoredit    = false;
			$this->watchthis    = $request->getBool( 'watchthis', false ); // Watch may be overriden by request parameters
			$this->recreate     = false;

			// When creating a new section, we can preload a section title by passing it as the
			// preloadtitle parameter in the URL (Bug 13100)
			if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
				$this->sectiontitle = $request->getVal( 'preloadtitle' );
				// Once wpSummary isn't being use for setting section titles, we should delete this.
				$this->summary = $request->getVal( 'preloadtitle' );
			}
			elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
				$this->summary = $request->getText( 'summary' );
				if ( $this->summary !== '' ) {
					$this->hasPresetSummary = true;
				}
			}

			if ( $request->getVal( 'minor' ) ) {
				$this->minoredit = true;
			}
		}

		$this->bot = $request->getBool( 'bot', true );
		$this->nosummary = $request->getBool( 'nosummary' );

		$this->oldid = $request->getInt( 'oldid' );

		$this->live = $request->getCheck( 'live' );
		$this->editintro = $request->getText( 'editintro',
			// Custom edit intro for new sections
			$this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );

		// Allow extensions to modify form data
		wfRunHooks( 'EditPage::importFormData', array( $this, $request ) );

		wfProfileOut( __METHOD__ );
	}

	/**
	 * Subpage overridable method for extracting the page content data from the
	 * posted form to be placed in $this->textbox1, if using customized input
	 * this method should be overrided and return the page text that will be used
	 * for saving, preview parsing and so on...
	 *
	 * @param $request WebRequest
	 */
	protected function importContentFormData( &$request ) {
		return; // Don't do anything, EditPage already extracted wpTextbox1
	}

	/**
	 * Initialise form fields in the object
	 * Called on the first invocation, e.g. when a user clicks an edit link
	 * @return bool -- if the requested section is valid
	 */
	function initialiseForm() {
		global $wgUser;
		$this->edittime = $this->mArticle->getTimestamp();
		$this->textbox1 = $this->getContent( false );
		// activate checkboxes if user wants them to be always active
		# Sort out the "watch" checkbox
		if ( $wgUser->getOption( 'watchdefault' ) ) {
			# Watch all edits
			$this->watchthis = true;
		} elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
			# Watch creations
			$this->watchthis = true;
		} elseif ( $wgUser->isWatched( $this->mTitle ) ) {
			# Already watched
			$this->watchthis = true;
		}
		if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
			$this->minoredit = true;
		}
		if ( $this->textbox1 === false ) {
			return false;
		}
		wfProxyCheck();
		return true;
	}

	/**
	 * Fetch initial editing page content.
	 *
	 * @param $def_text string
	 * @return mixed string on success, $def_text for invalid sections
	 * @private
	 */
	function getContent( $def_text = '' ) {
		global $wgOut, $wgRequest, $wgParser;

		wfProfileIn( __METHOD__ );

		$text = false;

		// For message page not locally set, use the i18n message.
		// For other non-existent articles, use preload text if any.
		if ( !$this->mTitle->exists() || $this->section == 'new' ) {
			if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
				# If this is a system message, get the default text.
				$text = $this->mTitle->getDefaultMessageText();
			}
			if ( $text === false ) {
				# If requested, preload some text.
				$preload = $wgRequest->getVal( 'preload',
					// Custom preload text for new sections
					$this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
				$text = $this->getPreloadedText( $preload );
			}
		// For existing pages, get text based on "undo" or section parameters.
		} else {
			if ( $this->section != '' ) {
				// Get section edit text (returns $def_text for invalid sections)
				$text = $wgParser->getSection( $this->getOriginalContent(), $this->section, $def_text );
			} else {
				$undoafter = $wgRequest->getInt( 'undoafter' );
				$undo = $wgRequest->getInt( 'undo' );

				if ( $undo > 0 && $undoafter > 0 ) {
					if ( $undo < $undoafter ) {
						# If they got undoafter and undo round the wrong way, switch them
						list( $undo, $undoafter ) = array( $undoafter, $undo );
					}

					$undorev = Revision::newFromId( $undo );
					$oldrev = Revision::newFromId( $undoafter );

					# Sanity check, make sure it's the right page,
					# the revisions exist and they were not deleted.
					# Otherwise, $text will be left as-is.
					if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
						$undorev->getPage() == $oldrev->getPage() &&
						$undorev->getPage() == $this->mTitle->getArticleID() &&
						!$undorev->isDeleted( Revision::DELETED_TEXT ) &&
						!$oldrev->isDeleted( Revision::DELETED_TEXT ) ) {

						$text = $this->mArticle->getUndoText( $undorev, $oldrev );
						if ( $text === false ) {
							# Warn the user that something went wrong
							$undoMsg = 'failure';
						} else {
							# Inform the user of our success and set an automatic edit summary
							$undoMsg = 'success';

							# If we just undid one rev, use an autosummary
							$firstrev = $oldrev->getNext();
							if ( $firstrev && $firstrev->getId() == $undo ) {
								$undoSummary = wfMessage( 'undo-summary', $undo, $undorev->getUserText() )->inContentLanguage()->text();
								if ( $this->summary === '' ) {
									$this->summary = $undoSummary;
								} else {
									$this->summary = $undoSummary . wfMessage( 'colon-separator' )
										->inContentLanguage()->text() . $this->summary;
								}
								$this->undidRev = $undo;
							}
							$this->formtype = 'diff';
						}
					} else {
						// Failed basic sanity checks.
						// Older revisions may have been removed since the link
						// was created, or we may simply have got bogus input.
						$undoMsg = 'norev';
					}

					$class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
					$this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
						wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
				}

				if ( $text === false ) {
					$text = $this->getOriginalContent();
				}
			}
		}

		wfProfileOut( __METHOD__ );
		return $text;
	}

	/**
	 * Get the content of the wanted revision, without section extraction.
	 *
	 * The result of this function can be used to compare user's input with
	 * section replaced in its context (using WikiPage::replaceSection())
	 * to the original text of the edit.
	 *
	 * This difers from Article::getContent() that when a missing revision is
	 * encountered the result will be an empty string and not the
	 * 'missing-revision' message.
	 *
	 * @since 1.19
	 * @return string
	 */
	private function getOriginalContent() {
		if ( $this->section == 'new' ) {
			return $this->getCurrentText();
		}
		$revision = $this->mArticle->getRevisionFetched();
		if ( $revision === null ) {
			return '';
		}
		return $this->mArticle->getContent();
	}

	/**
	 * Get the actual text of the page. This is basically similar to
	 * WikiPage::getRawText() except that when the page doesn't exist an empty
	 * string is returned instead of false.
	 *
	 * @since 1.19
	 * @return string
	 */
	private function getCurrentText() {
		$text = $this->mArticle->getRawText();
		if ( $text === false ) {
			return '';
		} else {
			return $text;
		}
	}

	/**
	 * Use this method before edit() to preload some text into the edit box
	 *
	 * @param $text string
	 */
	public function setPreloadedText( $text ) {
		$this->mPreloadText = $text;
	}

	/**
	 * Get the contents to be preloaded into the box, either set by
	 * an earlier setPreloadText() or by loading the given page.
	 *
	 * @param $preload String: representing the title to preload from.
	 * @return String
	 */
	protected function getPreloadedText( $preload ) {
		global $wgUser, $wgParser;

		if ( !empty( $this->mPreloadText ) ) {
			return $this->mPreloadText;
		}

		if ( $preload === '' ) {
			return '';
		}

		$title = Title::newFromText( $preload );
		# Check for existence to avoid getting MediaWiki:Noarticletext
		if ( $title === null || !$title->exists() || !$title->userCan( 'read' ) ) {
			return '';
		}

		$page = WikiPage::factory( $title );
		if ( $page->isRedirect() ) {
			$title = $page->getRedirectTarget();
			# Same as before
			if ( $title === null || !$title->exists() || !$title->userCan( 'read' ) ) {
				return '';
			}
			$page = WikiPage::factory( $title );
		}

		$parserOptions = ParserOptions::newFromUser( $wgUser );
		return $wgParser->getPreloadText( $page->getRawText(), $title, $parserOptions );
	}

	/**
	 * Make sure the form isn't faking a user's credentials.
	 *
	 * @param $request WebRequest
	 * @return bool
	 * @private
	 */
	function tokenOk( &$request ) {
		global $wgUser;
		$token = $request->getVal( 'wpEditToken' );
		$this->mTokenOk = $wgUser->matchEditToken( $token );
		$this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
		return $this->mTokenOk;
	}

	/**
	 * Attempt submission
	 * @return bool false if output is done, true if the rest of the form should be displayed
	 */
	function attemptSave() {
		global $wgUser, $wgOut;

		$resultDetails = false;
		# Allow bots to exempt some edits from bot flagging
		$bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
		$status = $this->internalAttemptSave( $resultDetails, $bot );
		// FIXME: once the interface for internalAttemptSave() is made nicer, this should use the message in $status
		if ( $status->value == self::AS_SUCCESS_UPDATE || $status->value == self::AS_SUCCESS_NEW_ARTICLE ) {
			$this->didSave = true;
		}

		switch ( $status->value ) {
			case self::AS_HOOK_ERROR_EXPECTED:
			case self::AS_CONTENT_TOO_BIG:
			case self::AS_ARTICLE_WAS_DELETED:
			case self::AS_CONFLICT_DETECTED:
			case self::AS_SUMMARY_NEEDED:
			case self::AS_TEXTBOX_EMPTY:
			case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
			case self::AS_END:
				return true;

			case self::AS_HOOK_ERROR:
				return false;

			case self::AS_SUCCESS_NEW_ARTICLE:
				$query = $resultDetails['redirect'] ? 'redirect=no' : '';
				$anchor = isset ( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
				$wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
				return false;

			case self::AS_SUCCESS_UPDATE:
				$extraQuery = '';
				$sectionanchor = $resultDetails['sectionanchor'];

				// Give extensions a chance to modify URL query on update
				wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this->mArticle, &$sectionanchor, &$extraQuery ) );

				if ( $resultDetails['redirect'] ) {
					if ( $extraQuery == '' ) {
						$extraQuery = 'redirect=no';
					} else {
						$extraQuery = 'redirect=no&' . $extraQuery;
					}
				}
				$wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
				return false;

			case self::AS_BLANK_ARTICLE:
				$wgOut->redirect( $this->getContextTitle()->getFullURL() );
				return false;

			case self::AS_SPAM_ERROR:
				$this->spamPageWithContent( $resultDetails['spam'] );
				return false;

			case self::AS_BLOCKED_PAGE_FOR_USER:
				throw new UserBlockedError( $wgUser->getBlock() );

			case self::AS_IMAGE_REDIRECT_ANON:
			case self::AS_IMAGE_REDIRECT_LOGGED:
				throw new PermissionsError( 'upload' );

			case self::AS_READ_ONLY_PAGE_ANON:
			case self::AS_READ_ONLY_PAGE_LOGGED:
				throw new PermissionsError( 'edit' );

			case self::AS_READ_ONLY_PAGE:
				throw new ReadOnlyError;

			case self::AS_RATE_LIMITED:
				throw new ThrottledError();

			case self::AS_NO_CREATE_PERMISSION:
				$permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
				throw new PermissionsError( $permission );

			default:
				// We don't recognize $status->value. The only way that can happen
				// is if an extension hook aborted from inside ArticleSave.
				// Render the status object into $this->hookError
				// FIXME this sucks, we should just use the Status object throughout
				$this->hookError = '<div class="error">' . $status->getWikitext() .
					'</div>';
				return true;
		}
	}

	/**
	 * Attempt submission (no UI)
	 *
	 * @param $result
	 * @param $bot bool
	 *
	 * @return Status object, possibly with a message, but always with one of the AS_* constants in $status->value,
	 *
	 * FIXME: This interface is TERRIBLE, but hard to get rid of due to various error display idiosyncrasies. There are
	 * also lots of cases where error metadata is set in the object and retrieved later instead of being returned, e.g.
	 * AS_CONTENT_TOO_BIG and AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some time.
	 */
	function internalAttemptSave( &$result, $bot = false ) {
		global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;

		$status = Status::newGood();

		wfProfileIn( __METHOD__  );
		wfProfileIn( __METHOD__ . '-checks' );

		if ( !wfRunHooks( 'EditPage::attemptSave', array( $this ) ) ) {
			wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
			$status->fatal( 'hookaborted' );
			$status->value = self::AS_HOOK_ERROR;
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__  );
			return $status;
		}

		# Check image redirect
		if ( $this->mTitle->getNamespace() == NS_FILE &&
			Title::newFromRedirect( $this->textbox1 ) instanceof Title &&
			!$wgUser->isAllowed( 'upload' ) ) {
				$code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
				$status->setResult( false, $code );

				wfProfileOut( __METHOD__ . '-checks' );
				wfProfileOut( __METHOD__  );

				return $status;
		}

		# Check for spam
		$match = self::matchSummarySpamRegex( $this->summary );
		if ( $match === false ) {
			$match = self::matchSpamRegex( $this->textbox1 );
		}
		if ( $match !== false ) {
			$result['spam'] = $match;
			$ip = $wgRequest->getIP();
			$pdbk = $this->mTitle->getPrefixedDBkey();
			$match = str_replace( "\n", '', $match );
			wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
			$status->fatal( 'spamprotectionmatch', $match );
			$status->value = self::AS_SPAM_ERROR;
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}
		if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ) ) ) {
			# Error messages etc. could be handled within the hook...
			$status->fatal( 'hookaborted' );
			$status->value = self::AS_HOOK_ERROR;
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		} elseif ( $this->hookError != '' ) {
			# ...or the hook could be expecting us to produce an error
			$status->fatal( 'hookaborted' );
			$status->value = self::AS_HOOK_ERROR_EXPECTED;
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}

		if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
			// Auto-block user's IP if the account was "hard" blocked
			$wgUser->spreadAnyEditBlock();
			# Check block state against master, thus 'false'.
			$status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}

		$this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
		if ( $this->kblength > $wgMaxArticleSize ) {
			// Error will be displayed by showEditForm()
			$this->tooBig = true;
			$status->setResult( false, self::AS_CONTENT_TOO_BIG );
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}

		if ( !$wgUser->isAllowed( 'edit' ) ) {
			if ( $wgUser->isAnon() ) {
				$status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
				wfProfileOut( __METHOD__ . '-checks' );
				wfProfileOut( __METHOD__ );
				return $status;
			} else {
				$status->fatal( 'readonlytext' );
				$status->value = self::AS_READ_ONLY_PAGE_LOGGED;
				wfProfileOut( __METHOD__ . '-checks' );
				wfProfileOut( __METHOD__ );
				return $status;
			}
		}

		if ( wfReadOnly() ) {
			$status->fatal( 'readonlytext' );
			$status->value = self::AS_READ_ONLY_PAGE;
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}
		if ( $wgUser->pingLimiter() ) {
			$status->fatal( 'actionthrottledtext' );
			$status->value = self::AS_RATE_LIMITED;
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}

		# If the article has been deleted while editing, don't save it without
		# confirmation
		if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
			$status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
			wfProfileOut( __METHOD__ . '-checks' );
			wfProfileOut( __METHOD__ );
			return $status;
		}

		wfProfileOut( __METHOD__ . '-checks' );

		# Load the page data from the master. If anything changes in the meantime,
		# we detect it by using page_latest like a token in a 1 try compare-and-swap.
		$this->mArticle->loadPageData( 'fromdbmaster' );
		$new = !$this->mArticle->exists();

		if ( $new ) {
			// Late check for create permission, just in case *PARANOIA*
			if ( !$this->mTitle->userCan( 'create' ) ) {
				$status->fatal( 'nocreatetext' );
				$status->value = self::AS_NO_CREATE_PERMISSION;
				wfDebug( __METHOD__ . ": no create permission\n" );
				wfProfileOut( __METHOD__ );
				return $status;
			}

			# Don't save a new article if it's blank.
			if ( $this->textbox1 == '' ) {
				$status->setResult( false, self::AS_BLANK_ARTICLE );
				wfProfileOut( __METHOD__ );
				return $status;
			}

			// Run post-section-merge edit filter
			if ( !wfRunHooks( 'EditFilterMerged', array( $this, $this->textbox1, &$this->hookError, $this->summary ) ) ) {
				# Error messages etc. could be handled within the hook...
				$status->fatal( 'hookaborted' );
				$status->value = self::AS_HOOK_ERROR;
				wfProfileOut( __METHOD__ );
				return $status;
			} elseif ( $this->hookError != '' ) {
				# ...or the hook could be expecting us to produce an error
				$status->fatal( 'hookaborted' );
				$status->value = self::AS_HOOK_ERROR_EXPECTED;
				wfProfileOut( __METHOD__ );
				return $status;
			}

			$text = $this->textbox1;
			$result['sectionanchor'] = '';
			if ( $this->section == 'new' ) {
				if ( $this->sectiontitle !== '' ) {
					// Insert the section title above the content.
					$text = wfMessage( 'newsectionheaderdefaultlevel', $this->sectiontitle )
						->inContentLanguage()->text() . "\n\n" . $text;

					// Jump to the new section
					$result['sectionanchor'] = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );

					// If no edit summary was specified, create one automatically from the section
					// title and have it link to the new section. Otherwise, respect the summary as
					// passed.
					if ( $this->summary === '' ) {
						$cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
						$this->summary = wfMessage( 'newsectionsummary' )
							->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
					}
				} elseif ( $this->summary !== '' ) {
					// Insert the section title above the content.
					$text = wfMessage( 'newsectionheaderdefaultlevel', $this->summary )
						->inContentLanguage()->text() . "\n\n" . $text;

					// Jump to the new section
					$result['sectionanchor'] = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );

					// Create a link to the new section from the edit summary.
					$cleanSummary = $wgParser->stripSectionName( $this->summary );
					$this->summary = wfMessage( 'newsectionsummary' )
						->rawParams( $cleanSummary )->inContentLanguage()->text();
				}
			}

			$status->value = self::AS_SUCCESS_NEW_ARTICLE;

		} else {

			# Article exists. Check for edit conflict.
			$timestamp = $this->mArticle->getTimestamp();
			wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );

			if ( $timestamp != $this->edittime ) {
				$this->isConflict = true;
				if ( $this->section == 'new' ) {
					if ( $this->mArticle->getUserText() == $wgUser->getName() &&
						$this->mArticle->getComment() == $this->summary ) {
						// Probably a duplicate submission of a new comment.
						// This can happen when squid resends a request after
						// a timeout but the first one actually went through.
						wfDebug( __METHOD__ . ": duplicate new section submission; trigger edit conflict!\n" );
					} else {
						// New comment; suppress conflict.
						$this->isConflict = false;
						wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
					}
				} elseif ( $this->section == '' && Revision::userWasLastToEdit( DB_MASTER,  $this->mTitle->getArticleID(), $wgUser->getId(), $this->edittime ) ) {
					# Suppress edit conflict with self, except for section edits where merging is required.
					wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
					$this->isConflict = false;
				}
			}

			// If sectiontitle is set, use it, otherwise use the summary as the section title (for
			// backwards compatibility with old forms/bots).
			if ( $this->sectiontitle !== '' ) {
				$sectionTitle = $this->sectiontitle;
			} else {
				$sectionTitle = $this->summary;
			}

			if ( $this->isConflict ) {
				wfDebug( __METHOD__ . ": conflict! getting section '$this->section' for time '$this->edittime' (article time '{$timestamp}')\n" );
				$text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $sectionTitle, $this->edittime );
			} else {
				wfDebug( __METHOD__ . ": getting section '$this->section'\n" );
				$text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $sectionTitle );
			}
			if ( is_null( $text ) ) {
				wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
				$this->isConflict = true;
				$text = $this->textbox1; // do not try to merge here!
			} elseif ( $this->isConflict ) {
				# Attempt merge
				if ( $this->mergeChangesInto( $text ) ) {
					// Successful merge! Maybe we should tell the user the good news?
					$this->isConflict = false;
					wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
				} else {
					$this->section = '';
					$this->textbox1 = $text;
					wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
				}
			}

			if ( $this->isConflict ) {
				$status->setResult( false, self::AS_CONFLICT_DETECTED );
				wfProfileOut( __METHOD__ );
				return $status;
			}

			// Run post-section-merge edit filter
			if ( !wfRunHooks( 'EditFilterMerged', array( $this, $text, &$this->hookError, $this->summary ) ) ) {
				# Error messages etc. could be handled within the hook...
				$status->fatal( 'hookaborted' );
				$status->value = self::AS_HOOK_ERROR;
				wfProfileOut( __METHOD__ );
				return $status;
			} elseif ( $this->hookError != '' ) {
				# ...or the hook could be expecting us to produce an error
				$status->fatal( 'hookaborted' );
				$status->value = self::AS_HOOK_ERROR_EXPECTED;
				wfProfileOut( __METHOD__ );
				return $status;
			}

			# Handle the user preference to force summaries here, but not for null edits
			if ( $this->section != 'new' && !$this->allowBlankSummary
				&& $this->getOriginalContent() != $text
				&& !Title::newFromRedirect( $text ) ) # check if it's not a redirect
			{
				if ( md5( $this->summary ) == $this->autoSumm ) {
					$this->missingSummary = true;
					$status->fatal( 'missingsummary' );
					$status->value = self::AS_SUMMARY_NEEDED;
					wfProfileOut( __METHOD__ );
					return $status;
				}
			}

			# And a similar thing for new sections
			if ( $this->section == 'new' && !$this->allowBlankSummary ) {
				if ( trim( $this->summary ) == '' ) {
					$this->missingSummary = true;
					$status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
					$status->value = self::AS_SUMMARY_NEEDED;
					wfProfileOut( __METHOD__ );
					return $status;
				}
			}

			# All's well
			wfProfileIn( __METHOD__ . '-sectionanchor' );
			$sectionanchor = '';
			if ( $this->section == 'new' ) {
				if ( $this->textbox1 == '' ) {
					$this->missingComment = true;
					$status->fatal( 'missingcommenttext' );
					$status->value = self::AS_TEXTBOX_EMPTY;
					wfProfileOut( __METHOD__ . '-sectionanchor' );
					wfProfileOut( __METHOD__ );
					return $status;
				}
				if ( $this->sectiontitle !== '' ) {
					$sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
					// If no edit summary was specified, create one automatically from the section
					// title and have it link to the new section. Otherwise, respect the summary as
					// passed.
					if ( $this->summary === '' ) {
						$cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
						$this->summary = wfMessage( 'newsectionsummary' )
							->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
					}
				} elseif ( $this->summary !== '' ) {
					$sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
					# This is a new section, so create a link to the new section
					# in the revision summary.
					$cleanSummary = $wgParser->stripSectionName( $this->summary );
					$this->summary = wfMessage( 'newsectionsummary' )
						->rawParams( $cleanSummary )->inContentLanguage()->text();
				}
			} elseif ( $this->section != '' ) {
				# Try to get a section anchor from the section source, redirect to edited section if header found
				# XXX: might be better to integrate this into Article::replaceSection
				# for duplicate heading checking and maybe parsing
				$hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
				# we can't deal with anchors, includes, html etc in the header for now,
				# headline would need to be parsed to improve this
				if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
					$sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
				}
			}
			$result['sectionanchor'] = $sectionanchor;
			wfProfileOut( __METHOD__ . '-sectionanchor' );

			// Save errors may fall down to the edit form, but we've now
			// merged the section into full text. Clear the section field
			// so that later submission of conflict forms won't try to
			// replace that into a duplicated mess.
			$this->textbox1 = $text;
			$this->section = '';

			$status->value = self::AS_SUCCESS_UPDATE;
		}

		// Check for length errors again now that the section is merged in
		$this->kblength = (int)( strlen( $text ) / 1024 );
		if ( $this->kblength > $wgMaxArticleSize ) {
			$this->tooBig = true;
			$status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
			wfProfileOut( __METHOD__ );
			return $status;
		}

		$flags = EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
			( $new ? EDIT_NEW : EDIT_UPDATE ) |
			( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
			( $bot ? EDIT_FORCE_BOT : 0 );

		$doEditStatus = $this->mArticle->doEdit( $text, $this->summary, $flags );

		if ( $doEditStatus->isOK() ) {
			$result['redirect'] = Title::newFromRedirect( $text ) !== null;
			$this->commitWatch();
			wfProfileOut( __METHOD__ );
			return $status;
		} else {
			// Failure from doEdit()
			// Show the edit conflict page for certain recognized errors from doEdit(),
			// but don't show it for errors from extension hooks
			$errors = $doEditStatus->getErrorsArray();
			if ( in_array( $errors[0][0], array( 'edit-gone-missing', 'edit-conflict',
				'edit-already-exists' ) ) )
			{
				$this->isConflict = true;
				// Destroys data doEdit() put in $status->value but who cares
				$doEditStatus->value = self::AS_END;
			}
			wfProfileOut( __METHOD__ );
			return $doEditStatus;
		}
	}

	/**
	 * Commit the change of watch status
	 */
	protected function commitWatch() {
		global $wgUser;
		if ( $wgUser->isLoggedIn() && $this->watchthis != $wgUser->isWatched( $this->mTitle ) ) {
			$dbw = wfGetDB( DB_MASTER );
			$dbw->begin( __METHOD__ );
			if ( $this->watchthis ) {
				WatchAction::doWatch( $this->mTitle, $wgUser );
			} else {
				WatchAction::doUnwatch( $this->mTitle, $wgUser );
			}
			$dbw->commit( __METHOD__ );
		}
	}

	/**
	 * @private
	 * @todo document
	 *
	 * @param $editText string
	 *
	 * @return bool
	 */
	function mergeChangesInto( &$editText ) {
		wfProfileIn( __METHOD__ );

		$db = wfGetDB( DB_MASTER );

		// This is the revision the edito…