From 72e90545454c0e014318fa3c81658e035aac58c1 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Wed, 10 Jun 2009 13:00:47 +0200
Subject: applying patch to version 1.15.0

---
 includes/ChangeTags.php | 183 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 includes/ChangeTags.php

(limited to 'includes/ChangeTags.php')

diff --git a/includes/ChangeTags.php b/includes/ChangeTags.php
new file mode 100644
index 00000000..de804c5c
--- /dev/null
+++ b/includes/ChangeTags.php
@@ -0,0 +1,183 @@
+<?php
+
+if (!defined( 'MEDIAWIKI' ))
+	die;
+
+class ChangeTags {
+	static function formatSummaryRow( $tags, $page ) {
+		if (!$tags)
+			return array('',array());
+
+		$classes = array();
+		
+		$tags = explode( ',', $tags );
+		$displayTags = array();
+		foreach( $tags as $tag ) {
+			$displayTags[] = self::tagDescription( $tag );
+			$classes[] = "mw-tag-$tag";
+		}
+
+		return array( '(' . implode( ', ', $displayTags ) . ')', $classes );
+	}
+
+	static function tagDescription( $tag ) {
+		$msg = wfMsgExt( "tag-$tag", 'parseinline' );
+		if ( wfEmptyMsg( "tag-$tag", $msg ) ) {
+			return htmlspecialchars($tag);
+		}
+		return $msg;
+	}
+
+	## Basic utility method to add tags to a particular change, given its rc_id, rev_id and/or log_id.
+	static function addTags( $tags, $rc_id=null, $rev_id=null, $log_id=null, $params = null ) {
+		if ( !is_array($tags) ) {
+			$tags = array( $tags );
+		}
+
+		$tags = array_filter( $tags ); // Make sure we're submitting all tags...
+
+		if (!$rc_id && !$rev_id && !$log_id) {
+			throw new MWException( "At least one of: RCID, revision ID, and log ID MUST be specified when adding a tag to a change!" );
+		}
+
+		$dbr = wfGetDB( DB_SLAVE );
+
+		// Might as well look for rcids and so on.
+		if (!$rc_id) {
+			$dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.
+			if ($log_id) {
+				$rc_id = $dbr->selectField( 'recentchanges', 'rc_id', array( 'rc_logid' => $log_id ), __METHOD__ );
+			} elseif ($rev_id) {
+				$rc_id = $dbr->selectField( 'recentchanges', 'rc_id', array( 'rc_this_oldid' => $rev_id ), __METHOD__ );
+			}
+		} elseif (!$log_id && !$rev_id) {
+			$dbr = wfGetDB( DB_MASTER ); // Info might be out of date, somewhat fractionally, on slave.
+			$log_id = $dbr->selectField( 'recentchanges', 'rc_logid', array( 'rc_id' => $rc_id ), __METHOD__ );
+			$rev_id = $dbr->selectField( 'recentchanges', 'rc_this_oldid', array( 'rc_id' => $rc_id ), __METHOD__ );
+		}
+
+		$tsConds = array_filter( array( 'ts_rc_id' => $rc_id, 'ts_rev_id' => $rev_id, 'ts_log_id' => $log_id ) );
+
+		## Update the summary row.
+		$prevTags = $dbr->selectField( 'tag_summary', 'ts_tags', $tsConds, __METHOD__ );
+		$prevTags = $prevTags ? $prevTags : '';
+		$prevTags = array_filter( explode( ',', $prevTags ) );
+		$newTags = array_unique( array_merge( $prevTags, $tags ) );
+		sort($prevTags);
+		sort($newTags);
+
+		if ( $prevTags == $newTags ) {
+			// No change.
+			return false;
+		}
+
+		$dbw = wfGetDB( DB_MASTER );
+		$dbw->replace( 'tag_summary', array( 'ts_rev_id', 'ts_rc_id', 'ts_log_id' ),  array_filter( array_merge( $tsConds, array( 'ts_tags' => implode( ',', $newTags ) ) ) ), __METHOD__ );
+
+		// Insert the tags rows.
+		$tagsRows = array();
+		foreach( $tags as $tag ) { // Filter so we don't insert NULLs as zero accidentally.
+			$tagsRows[] = array_filter( array( 'ct_tag' => $tag, 'ct_rc_id' => $rc_id, 'ct_log_id' => $log_id, 'ct_rev_id' => $rev_id, 'ct_params' => $params ) );
+		}
+
+		$dbw->insert( 'change_tag', $tagsRows, __METHOD__, array('IGNORE') );
+
+		return true;
+	}
+
+	/**
+	 * Applies all tags-related changes to a query.
+	 * Handles selecting tags, and filtering.
+	 * Needs $tables to be set up properly, so we can figure out which join conditions to use.
+	*/
+	static function modifyDisplayQuery( &$tables, &$fields,  &$conds,
+										&$join_conds, &$options, $filter_tag = false ) {
+		global $wgRequest, $wgUseTagFilter;
+		
+		if ($filter_tag === false) {
+			$filter_tag = $wgRequest->getVal( 'tagfilter' );
+		}
+
+		// Figure out which conditions can be done.
+		$join_field = '';
+		if ( in_array('recentchanges', $tables) ) {
+			$join_cond = 'rc_id';
+		} elseif( in_array('logging', $tables) ) {
+			$join_cond = 'log_id';
+		} elseif ( in_array('revision', $tables) ) {
+			$join_cond = 'rev_id';
+		} else {
+			throw new MWException( "Unable to determine appropriate JOIN condition for tagging." );
+		}
+
+		// JOIN on tag_summary
+		$tables[] = 'tag_summary';
+		$join_conds['tag_summary'] = array( 'LEFT JOIN', "ts_$join_cond=$join_cond" );
+		$fields[] = 'ts_tags';
+		
+		if ($wgUseTagFilter && $filter_tag) {
+			// Somebody wants to filter on a tag.
+			// Add an INNER JOIN on change_tag
+
+			// FORCE INDEX -- change_tags will almost ALWAYS be the correct query plan.
+			$options['USE INDEX'] = array( 'change_tag' => 'change_tag_tag_id' );
+			unset( $options['FORCE INDEX'] );
+			$tables[] = 'change_tag';
+			$join_conds['change_tag'] = array( 'INNER JOIN', "ct_$join_cond=$join_cond" );
+			$conds['ct_tag'] = $filter_tag;
+		}
+	}
+
+	/**
+	 * If $fullForm is set to false, then it returns an array of (label, form).
+	 * If $fullForm is true, it returns an entire form.
+	 */
+	static function buildTagFilterSelector( $selected='', $fullForm = false /* used to put a full form around the selector */ ) {
+		global $wgUseTagFilter;
+		
+		if ( !$wgUseTagFilter || !count( self::listDefinedTags() ) )
+			return $fullForm ? '' : array();
+	
+		global $wgTitle;
+		
+		$data = array( wfMsgExt( 'tag-filter', 'parseinline' ), Xml::input( 'tagfilter', 20, $selected ) );
+
+		if (!$fullForm) {
+			return $data;
+		}
+
+		$html = implode( '&nbsp;', $data );
+		$html .= "\n" . Xml::element( 'input', array( 'type' => 'submit', 'value' => wfMsg( 'tag-filter-submit' ) ) );
+		$html .= "\n" . Xml::hidden( 'title', $wgTitle-> getPrefixedText() );
+		$html = Xml::tags( 'form', array( 'action' => $wgTitle->getLocalURL(), 'method' => 'get' ), $html );
+
+		return $html;
+	}
+
+	/** Basically lists defined tags which count even if they aren't applied to anything */
+	static function listDefinedTags() {
+		// Caching...
+		global $wgMemc;
+		$key = wfMemcKey( 'valid-tags' );
+
+		if ($tags = $wgMemc->get( $key ))
+			return $tags;
+	
+		$emptyTags = array();
+
+		// Some DB stuff
+		$dbr = wfGetDB( DB_SLAVE );
+		$res = $dbr->select( 'valid_tag', 'vt_tag', array(), __METHOD__ );
+		while( $row = $res->fetchObject() ) {
+			$emptyTags[] = $row->vt_tag;
+		}
+		
+		wfRunHooks( 'ListDefinedTags', array(&$emptyTags) );
+
+		$emptyTags = array_filter( array_unique( $emptyTags ) );
+
+		// Short-term caching.
+		$wgMemc->set( $key, $emptyTags, 300 );
+		return $emptyTags;
+	}
+}
-- 
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