mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Echo
synced 2024-11-13 17:57:21 +00:00
793 lines
22 KiB
PHP
793 lines
22 KiB
PHP
<?php
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abstract class EchoDiscussionParser {
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static $timestampRegex;
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static $headerRegex = '^\=\=\s*([^=].*)\s*\=\=$';
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static $revisionInterpretationCache = array();
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/**
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* Given a Revision object, generates EchoEvent objects for
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* the discussion-related actions that occurred in that Revision.
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*
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* @param $revision Revision object
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* @return null
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*/
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static function generateEventsForRevision( $revision ) {
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$interpretation = self::getChangeInterpretationForRevision( $revision );
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$createdEvents = false;
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$title = Title::newFromID( $revision->getPage() );
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$userID = $revision->getUser();
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$userName = $revision->getUserText();
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$user = $userID != 0 ? User::newFromId( $userID ) : User::newFromName( $userName, false );
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foreach( $interpretation as $action ) {
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if ( $action['type'] == 'add-comment' ) {
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$fullSection = $action['full-section'];
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$header = self::extractHeader( $fullSection );
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EchoEvent::create( array(
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'type' => 'add-comment',
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'title' => $title,
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'extra' => array(
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'revid' => $revision->getID(),
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'section-title' => $header,
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'content' => $action['content'],
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),
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'agent' => $user,
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) );
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$createdEvents = true;
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} elseif ( $action['type'] == 'new-section-with-comment' ) {
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$content = $action['content'];
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$header = self::extractHeader( $content );
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EchoEvent::create( array(
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'type' => 'add-talkpage-topic',
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'title' => $title,
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'extra' => array(
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'revid' => $revision->getID(),
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'section-title' => $header,
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'content' => $content,
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),
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'agent' => $user,
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) );
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$createdEvents = true;
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}
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}
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if ( !$createdEvents && $title->getNamespace() == NS_USER_TALK ) {
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$notifyUser = User::newFromName( $title->getText() );
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if ( $notifyUser && $notifyUser->getID() ) {
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$event = EchoEvent::create( array(
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'type' => 'edit-user-talk',
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'title' => $title,
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'extra' => array('revid' => $revision->getID()),
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'agent' => $user,
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) );
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}
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}
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}
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/**
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* Given a Revision object, determines which users are interested
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* in related EchoEvents.
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*
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* @param $revision Revision object.
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* @return Array of User objects
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*/
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static function getNotifiedUsersForComment( $revision ) {
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$interpretation = self::getChangeInterpretationForRevision( $revision );
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$users = array();
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foreach( $interpretation as $action ) {
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if ( $action['type'] == 'add-comment' ) {
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$fullSection = $action['full-section'];
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$interestedUsers = array_keys( self::extractSignatures( $fullSection ) );
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foreach( $interestedUsers as $userName ) {
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$user = User::newFromName( $userName );
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// Deliberately ignoring anonymous users
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if ( $user && $user->getID() ) {
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$users[$user->getID()] = $user;
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}
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}
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}
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}
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if ( $revision->getTitle()->getNamespace() == NS_USER_TALK ) {
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$userName = $revision->getTitle()->getText();
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$user = User::newFromName( $userName );
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if ( $user ) {
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$users[$user->getID()] = $user;
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}
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}
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return $users;
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}
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/**
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* Given a Revision object, returns a talk-page-centric interpretation
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* of the changes made in it.
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*
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* @param $revision Revision object
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* @see EchoDiscussionParser::interpretDiff
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* @return Array, see interpretDiff for details.
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*/
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static function getChangeInterpretationForRevision( $revision ) {
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if ( $revision->getID() && isset( self::$revisionInterpretationCache[$revision->getID()] ) ) {
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return self::$revisionInterpretationCache[$revision->getID()];
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}
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$userID = $revision->getUser();
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$userName = $revision->getUserText();
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$user = $userID != 0 ? User::newFromId( $userID ) : User::newFromName( $userName, false );
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$prevRevision = Revision::newFromId( $revision->getParentId() );
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$changes = self::getMachineReadableDiff( $prevRevision->getText(), $revision->getText() );
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$output = self::interpretDiff( $changes, $user->getName() );
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self::$revisionInterpretationCache[$revision->getID()] = $output;
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return $output;
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}
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/**
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* Given a machine-readable diff, interprets the changes
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* in terms of discussion page actions
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*
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* @todo Expand recognisable actions.
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* @param $changes Output of EchoEvent::getMachineReadableDiff
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* @param $user User name
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* @return Array of associative arrays.
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* Each entry represents an action, which is classified in the 'action' field.
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* All types contain a 'content' field except 'unknown'
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* (which instead passes through the machine-readable diff in 'details')
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* and 'unknown-change' (which provides 'new_content' and 'old_content')
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* action may be:
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* - add-comment: A comment signed by the user is added to an
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* existing section.
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* - new-section-with-comment: A new section is added, containing
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* a single comment signed by the user in question.
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* - unknown-signed-addition: Some signed content is added, but it
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* includes section headers, is signed by another user or
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* otherwise confuses the interpretation engine.
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* - unknown-multi-signed-addition: Some signed content is added,
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* but it contains multiple signatures.
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* - unknown-unsigned-addition: Some content is added, but it is
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* unsigned.
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* - unknown-subtraction: Some content was removed. These actions are
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* not currently analysed.
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* - unknown-change: Some content was replaced with other content.
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* These actions are not currently analysed.
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* - unknown: Unrecognised change type.
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*/
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static function interpretDiff( $changes, $user ) {
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// One extra item in $changes for _info
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$actions = array();
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foreach( $changes as $index => $change ) {
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if ( !is_numeric( $index ) ) {
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continue;
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}
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if ( ! $change['action'] ) {
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// Unknown action; skip
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continue;
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}
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if ( $change['action'] == 'add' ) {
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$content = trim( $change['content'] );
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$startSection = preg_match( "/\A" . self::$headerRegex.'/um', $content );
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$sectionCount = self::getSectionCount( $content );
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$signedUsers = array_keys( self::extractSignatures( $content ) );
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if (
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count( $signedUsers ) == 1 &&
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in_array( $user, $signedUsers )
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) {
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if ( $sectionCount === 0 ) {
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$fullSection = self::getFullSection( $changes['_info']['rhs'], $change['right-pos'] );
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$actions[] = array(
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'type' => 'add-comment',
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'content' => $content,
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'full-section' => $fullSection,
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);
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} elseif ( $startSection && $sectionCount === 1 ) {
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$actions[] = array(
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'type' => 'new-section-with-comment',
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'content' => $content,
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);
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} else {
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$actions[] = array(
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'type' => 'unknown-signed-addition',
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'content' => $content,
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);
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}
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} elseif ( count( $signedUsers ) >= 1 ) {
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$actions[] = array(
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'type' => 'unknown-multi-signed-addition',
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'content' => $content,
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);
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} else {
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$actions[] = array(
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'type' => 'unknown-unsigned-addition',
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'content' => $content,
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);
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}
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} elseif ( $change['action'] == 'subtract' ) {
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$actions[] = array(
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'type' => 'unknown-subtraction',
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'content' => $change['content'],
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);
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} elseif ( $change['action'] == 'change' ) {
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$actions[] = array(
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'type' => 'unknown-change',
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'old_content' => $change['old_content'],
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'new_content' => $change['new_content'],
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);
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} else {
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$actions[] = array(
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'type' => 'unknown',
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'details' => $change,
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);
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}
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}
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// $actions['_diff'] = $changes;
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// unset( $actions['_diff']['_info'] );
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return $actions;
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}
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/**
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* Finds the section that a given line is in.
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*
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* @param $lines Array of lines in the page.
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* @param $offset The line to find the full section for.
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* @return Content of the section, as a string.
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*/
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static function getFullSection( $lines, $offset ) {
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$content = $lines[$offset - 1];
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$headerRegex = '/' . self::$headerRegex . '/um';
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// Expand backwards...
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$continue = ! preg_match( $headerRegex, $lines[$offset - 1] );
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$i = $offset - 1;
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while ( $continue && $i > 0 ) {
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--$i;
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$line = $lines[$i];
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$content = "$line\n$content";
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if ( preg_match( $headerRegex, $line ) ) {
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$continue = false;
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}
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}
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// And then forwards...
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$continue = true;
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$i = $offset - 1;
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while ( $continue && $i < count($lines) - 1 ) {
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++$i;
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$line = $lines[$i];
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if ( preg_match( $headerRegex, $line ) ) {
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$continue = false;
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} else {
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$content .= "\n$line";
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}
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}
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return $content;
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}
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/**
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* Gets the number of section headers in a string.
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*
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* @param $text The text, as a string.
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* @return Number of section headers found.
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*/
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static function getSectionCount( $text ) {
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$text = trim($text);
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$matches = array();
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preg_match_all( '/'.self::$headerRegex.'/um', $text, $matches );
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return count( $matches[0] );
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}
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/**
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* Gets the title of a section
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*
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* @param $text The text of the section, as a string.
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* @return The title of the section, as a string.
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*/
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static function extractHeader( $text ) {
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$text = trim($text);
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$matches = array();
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if ( !preg_match( '/'.self::$headerRegex.'/um', $text, $matches ) ) {
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return false;
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}
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return trim( $matches[1] );
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}
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/**
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* Strips out a signature if possible.
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*
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* @param $text The wikitext to strip
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* @return String
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*/
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static function stripSignature( $text ) {
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$timestampPos = self::getTimestampPosition( $text );
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if ( $timestampPos === false ) {
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return $text;
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}
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$output = self::getUserFromLine( $text, $timestampPos );
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if ( $output === false ) {
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return substr( $text, 0, $timestampPos );
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}
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// Strip off signature with HTML truncation method.
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// This way tags which are opened will be closed.
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global $wgContLang;
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$truncated_text = $wgContLang->truncateHtml( $text, $output[0], '' );
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return $truncated_text;
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}
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/**
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* Strips unnecessary indentation and so on from comments
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*
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* @param $text The text to strip from
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* @return Stripped wikitext
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*/
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static function stripIndents( $text ) {
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// First strip all indentation from the beginning of lines
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$text = preg_replace( '/^\s*\:+/m', '', $text );
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// Now if there is only one list item, strip that too
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$listRegex = '/^\s*(?:[\:#*]\s*)*[#*]/m';
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$matches = array();
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if ( preg_match_all( $listRegex, $text, $matches ) ) {
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if ( count($matches) == 1 ) {
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$text = preg_replace( $listRegex, '', $text );
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}
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}
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return $text;
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}
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/**
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* Strips out a section header
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* @param $text The text to strip out the section header from.
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* @return String: The same text, with the section header stripped out.
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*/
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static function stripHeader( $text ) {
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$text = preg_replace( '/'.self::$headerRegex.'/um', '', $text );
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return $text;
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}
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/**
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* Determines whether the input is a signed comment.
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*
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* @param $text The text to check.
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* @param $user If set, will only return true if the comment is
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* signed by this user.
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* @return boolean: true or false.
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*/
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static function isSignedComment( $text, $user = false ) {
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$timestampPos = self::getTimestampPosition( $text );
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if ( $timestampPos === false ) {
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return false;
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}
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$userData = self::getUserFromLine( $text, $timestampPos );
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if ( $userData === false ) {
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return false;
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} elseif ( $user === false ) {
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return true;
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}
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list( $signaturePos, $foundUser ) = $userData;
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return User::getCanonicalName( $foundUser, false ) === User::getCanonicalName( $user, false );
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}
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/**
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* Finds the start position, if any, of the timestamp on a line
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*
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* @param $line The line to search for a signature on
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* @return Integer position
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*/
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static function getTimestampPosition( $line ) {
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$timestampRegex = self::getTimestampRegex();
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$endOfLine = self::getLineEndingRegex();
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$tsMatches = array();
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if ( ! preg_match(
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"/$timestampRegex$endOfLine/mu",
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$line,
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$tsMatches,
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PREG_OFFSET_CAPTURE
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) ) {
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return false;
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}
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return $tsMatches[0][0];
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}
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/**
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* Finds differences between $oldText and $newText
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* and returns the result in a machine-readable format.
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*
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* @param $oldText The "left hand side" of the diff.
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* @param $newText The "right hand side" of the diff.
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* @return Array of changes.
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* Each change consists of:
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* * An 'action', one of:
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* - add
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* - subtract
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* - change
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* * 'content' that was added or removed, or in the case
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* of a change, 'old_content' and 'new_content'
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* * 'left_pos' and 'right_pos' (in lines) of the change.
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*/
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static function getMachineReadableDiff( $oldText, $newText ) {
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$oldText = trim($oldText)."\n";
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$newText = trim($newText)."\n";
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$diff = wfDiff( $oldText, $newText, '-u -w' );
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$old_lines = explode("\n", $oldText);
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$new_lines = explode("\n", $newText);
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// First break down the diff into additions and subtractions
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$diff_lines = explode( "\n", $diff );
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$left_pos = 0;
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$right_pos = 0;
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$changes = array();
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$change_run = false;
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$sub_lines = 0;
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for( $i = 0; $i < count( $diff_lines ); ++$i ) {
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$line = $diff_lines[$i];
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if ( strlen($line) == 0 ) {
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continue;
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}
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$line_type = $line[0];
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if ( $line_type == ' ' ) {
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++$left_pos;
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++$right_pos;
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} elseif ( $line_type == '@' ) {
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list($at, $lhs_pos, $rhs_pos, $at) = explode( ' ', $line );
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$lhs_pos = substr( $lhs_pos, 1 );
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$rhs_pos = substr( $rhs_pos, 1 );
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list( $left_pos ) = explode( ',', $lhs_pos );
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list( $right_pos ) = explode( ',', $rhs_pos );
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$change_run = false;
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} elseif ( $line_type == '-' ) {
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$subtracted_line = substr( $line, 1 );
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if ( trim( $subtracted_line ) === '' ) {
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++$left_pos;
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continue;
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}
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if ( $change_run && $changes[$change_run]['action'] == 'subtract' ) {
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++$sub_lines;
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$changes[$change_run]['content'] .= "\n" . $subtracted_line;
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} else {
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$sub_lines = 1;
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$changes[] = array(
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'action' => 'subtract',
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'left-pos' => $left_pos,
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'right-pos' => $right_pos,
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'content' => $subtracted_line,
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);
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$change_run = count($changes)-1;
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}
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// Consistency check
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if ( $old_lines[$left_pos-1] != $subtracted_line ) {
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throw new MWException( "Left offset consistency error.\nOffset: $right_pos\nExpected: {$old_lines[$left_pos-1]}\nActual: $subtracted_line" );
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}
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++$left_pos;
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} elseif ( $line_type == '+' ) {
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$added_line = substr( $line, 1 );
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if ( $change_run !== false && $changes[$change_run]['action'] == 'add' ) {
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$changes[$change_run]['content'] .= "\n" . $added_line;
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} elseif ( $change_run !== false && $changes[$change_run]['action'] == 'subtract' ) {
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$changes[$change_run]['action'] = 'change';
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$changes[$change_run]['old_content'] = $changes[$change_run]['content'];
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$changes[$change_run]['new_content'] = $added_line;
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--$sub_lines;
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unset( $changes[$change_run]['content'] );
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} elseif ( $change_run !== false && $changes[$change_run]['action'] == 'change' && $sub_lines > 0 ) {
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--$sub_lines;
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$changes[$change_run]['new_content'] .= "\n" . $added_line;
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} else {
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$changes[] = array(
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'action' => 'add',
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'left-pos' => $left_pos,
|
|
'right-pos' => $right_pos,
|
|
'content' => $added_line,
|
|
);
|
|
$change_run = count($changes)-1;
|
|
}
|
|
|
|
// Consistency check
|
|
if ( $new_lines[$right_pos-1] != $added_line ) {
|
|
throw new MWException( "Right offset consistency error.\nOffset: $right_pos\nExpected: {$new_lines[$right_pos-1]}\nActual: $added_line\n" );
|
|
}
|
|
++$right_pos;
|
|
}
|
|
}
|
|
|
|
$changes['_info'] = array(
|
|
'lhs-length' => count($old_lines),
|
|
'rhs-length' => count($new_lines),
|
|
'lhs' => $old_lines,
|
|
'rhs' => $new_lines,
|
|
);
|
|
|
|
return $changes;
|
|
}
|
|
|
|
/**
|
|
* Finds and extracts signatures in $text
|
|
*
|
|
* @param $text The text in which to look for signed comments.
|
|
* @return Associative array. The key is the username, the value
|
|
* is the last signature that was found.
|
|
*/
|
|
static function extractSignatures( $text ) {
|
|
global $wgContLang;
|
|
|
|
$lines = explode( "\n", $text );
|
|
$timestampRegex = self::getTimestampRegex();
|
|
$endOfLine = self::getLineEndingRegex();
|
|
|
|
$output = array();
|
|
|
|
$lineNumber = 0;
|
|
|
|
foreach( $lines as $line ) {
|
|
++$lineNumber;
|
|
$tsMatches = array();
|
|
if ( ! preg_match(
|
|
"/$timestampRegex$endOfLine/mu",
|
|
$line,
|
|
$tsMatches,
|
|
PREG_OFFSET_CAPTURE
|
|
) ) {
|
|
// Ignore lines that don't finish with a timestamp
|
|
// print "I\tNo timestamp\n";
|
|
// print "$line\n";
|
|
continue;
|
|
}
|
|
|
|
// Now that we know we have a timestamp, look for
|
|
// the last user link on the line.
|
|
$userData = self::getUserFromLine( $line, $tsMatches[0][0] );
|
|
if ( $userData === false ) {
|
|
// print "F\t$lineNumber\t$line\n";
|
|
continue;
|
|
} else {
|
|
// print "S\t$lineNumber\n";
|
|
}
|
|
|
|
list( $signaturePos, $user ) = $userData;
|
|
|
|
$signature = substr( $line, $signaturePos );
|
|
$output[$user] = $signature;
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* From a line in a wiki page, determine which user, if any,
|
|
* has signed it.
|
|
*
|
|
* @param $line The line, as a string.
|
|
* @param $timestampPos The offset of the start of the timestamp.
|
|
* @return false for none, Array for success.
|
|
* - First element is the position of the signature.
|
|
* - Second element is the normalised user name.
|
|
*/
|
|
static function getUserFromLine( $line, $timestampPos ) {
|
|
global $wgContLang;
|
|
$possiblePrefixes = array( // Later entries have a higher precedence
|
|
'[[' . $wgContLang->getNsText( NS_USER ) . ':',
|
|
'[[' . $wgContLang->getNsText( NS_USER_TALK ) . ':',
|
|
'[[' . SpecialPage::getTitleFor('Contributions')->getPrefixedText() . '/',
|
|
);
|
|
|
|
foreach( $possiblePrefixes as $prefix ) {
|
|
if ( strpos( $prefix, '_' ) !== false ) {
|
|
$possiblePrefixes[] = str_replace( '_', ' ', $prefix );
|
|
}
|
|
}
|
|
|
|
$winningUser = false;
|
|
$winningPos = false;
|
|
|
|
// Look for the leftmost link to the rightmost user
|
|
foreach( $possiblePrefixes as $prefix ) {
|
|
$output = self::getLinkFromLine( $line, $prefix );
|
|
|
|
if ( $output === false ) {
|
|
continue;
|
|
} else {
|
|
list( $pos, $user ) = $output;
|
|
}
|
|
|
|
// Couldn't be a signature
|
|
if ( ( $timestampPos - $pos ) > 255 ) {
|
|
continue;
|
|
}
|
|
|
|
if (
|
|
$winningPos === false ||
|
|
( $pos > $winningPos && $user !== $winningUser ) ||
|
|
(
|
|
$pos < $winningPos &&
|
|
$user === $winningUser
|
|
)
|
|
) {
|
|
$winningPos = $pos;
|
|
$winningUser = ucfirst( trim( $user ) );
|
|
}
|
|
}
|
|
|
|
if ( $winningUser === false ) {
|
|
// print "E\tNo winning user\n";
|
|
return false;
|
|
}
|
|
|
|
return array( $winningPos, $winningUser );
|
|
}
|
|
|
|
/**
|
|
* Find the last link beginning with a given prefix on a line.
|
|
*
|
|
* @param $line The line to search, as a string.
|
|
* @param $linkPrefix The prefix to search for.
|
|
* @return false for failure, array for success.
|
|
* - First element is the string offset of the link.
|
|
* - Second element is the user the link refers to.
|
|
*/
|
|
static function getLinkFromLine( $line, $linkPrefix, $failureOffset = false ) {
|
|
$offset = 0;
|
|
|
|
// If extraction failed at another offset, try again.
|
|
if ( $failureOffset !== false ) {
|
|
$offset = $failureOffset - strlen( $line ) - 1;
|
|
}
|
|
|
|
$linkPos = strripos( $line, $linkPrefix, $offset );
|
|
|
|
if ( $linkPos === false ) {
|
|
// print "I\tNo match for $linkPrefix\n";
|
|
return false;
|
|
}
|
|
|
|
$linkUser = self::extractUserFromLink( $line, $linkPrefix, $linkPos );
|
|
|
|
if ( $linkUser === false ) {
|
|
// print "E\tExtraction failed\t$linkPrefix\n";
|
|
// Look for another place.
|
|
return self::getLinkFromLine( $line, $linkPrefix, $linkPos );
|
|
} else {
|
|
return array( $linkPos, $linkUser );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Given text including a link, gives the user that that link refers to
|
|
*
|
|
* @param $text The text to extract from.
|
|
* @param $prefix The link prefix that was used to find the link.
|
|
* @param $offset Optionally, the offset of the start of the link.
|
|
* @return type description
|
|
*/
|
|
static function extractUserFromLink( $text, $prefix, $offset = 0 ) {
|
|
$userPart = substr( $text, strlen($prefix) + $offset );
|
|
|
|
$userMatches = array();
|
|
if ( ! preg_match(
|
|
'/^[^\|\]\#]+/u',
|
|
$userPart,
|
|
$userMatches
|
|
) ) {
|
|
// user link is invalid
|
|
// print "I\tUser link invalid\t$userPart\n";
|
|
// print "E\tCannot find user info to extract\n";
|
|
return false;
|
|
}
|
|
|
|
$user = $userMatches[0];
|
|
|
|
if (
|
|
! User::isIP($user) &&
|
|
User::getCanonicalName($user) === false
|
|
) {
|
|
// Not a real username
|
|
// print "E\tInvalid username\n";
|
|
return false;
|
|
}
|
|
|
|
return User::getCanonicalName( $userMatches[0], false );
|
|
}
|
|
|
|
/**
|
|
* Gets a regular expression fragmentmatching characters that
|
|
* can appear in a line after the signature.
|
|
*
|
|
* @return String regular expression fragment.
|
|
*/
|
|
static function getLineEndingRegex() {
|
|
$ignoredEndings = array(
|
|
'\s*',
|
|
preg_quote('}'),
|
|
preg_quote('{'),
|
|
'\<[^\>]+\>',
|
|
preg_quote('{{').'[^}]+'.preg_quote('}}'),
|
|
);
|
|
|
|
$regex = '(?:' . implode( '|', $ignoredEndings ) . ')*';
|
|
|
|
return $regex;
|
|
}
|
|
|
|
/**
|
|
* Gets a regular expression that will match this wiki's
|
|
* timestamps as given by ~~~~.
|
|
*
|
|
* @return String regular expression fragment.
|
|
*/
|
|
static function getTimestampRegex() {
|
|
if ( self::$timestampRegex !== null ) {
|
|
return self::$timestampRegex;
|
|
}
|
|
|
|
// Step 1: Get an exemplar timestamp
|
|
$title = Title::newMainPage();
|
|
$user = User::newFromName('Test');
|
|
$options = new ParserOptions;
|
|
|
|
global $wgParser;
|
|
$exemplarTimestamp =
|
|
$wgParser->preSaveTransform( '~~~~~', $title, $user, $options );
|
|
|
|
// Step 2: Generalise it
|
|
// Trim off the timezone to replace at the end
|
|
$output = $exemplarTimestamp;
|
|
$tzRegex = '/\s*\(\w+\)\s*$/';
|
|
$tzMatches = array();
|
|
preg_match( $tzRegex, $output, $tzMatches );
|
|
$output = preg_replace( $tzRegex, '', $output );
|
|
$output = preg_quote( $output, '/' );
|
|
$output = preg_replace( '/[^\d\W]+/u', '[^\d\W]+', $output );
|
|
$output = preg_replace( '/\d+/u', '\d+', $output );
|
|
|
|
$output .= preg_quote($tzMatches[0]);
|
|
|
|
if ( ! preg_match( "/$output/u", $exemplarTimestamp ) ) {
|
|
throw new MWException( "Timestamp regex does not match exemplar" );
|
|
}
|
|
|
|
self::$timestampRegex = $output;
|
|
|
|
return $output;
|
|
}
|
|
} |