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<?php
require_once ( "Feed.php" );
# This is a class for doing query pages; since they're almost all the same,
# we factor out some of the functionality into a superclass, and let
# subclasses derive from it.
class QueryPage {
# Subclasses return their name here. Make sure the name is also
# specified in SpecialPage.php and in Language.php as a language message param.
function getName() {
return "";
}
# Subclasses return an SQL query here.
#
# Note that the query itself should return the following three columns:
# 'type' (your special page's name), 'namespace, 'title', and 'value'
# (numeric) *in that order*. These may be stored in the querycache table
# for expensive queries, and that cached data will be returned sometimes,
# so the presence of extra fields can't be relied on.
#
# Don't include an ORDER or LIMIT clause, this will be added.
function getSQL() {
return "SELECT 'sample' as type, 0 as namespace, 'Sample result' as title, 42 as value";
}
# Override to sort by increasing values
function sortDescending() {
return true;
}
# Don't override this unless you're darn sure.
function getOrderLimit( $offset, $limit ) {
return " ORDER BY value " .
($this->sortDescending() ? "DESC" : "")
. wfLimitResult($limit,$offset);
}
# Is this query expensive (for some definition of expensive)? Then we
# don't let it run in miser mode. $wgDisableQueryPages causes all query
# pages to be declared expensive. Some query pages are always expensive.
function isExpensive( ) {
global $wgDisableQueryPages;
return $wgDisableQueryPages;
}
# Formats the results of the query for display. The skin is the current
# skin; you can use it for making links. The result is a single row of
# result data. You should be able to grab SQL results off of it.
function formatResult( $skin, $result ) {
return "";
}
# This is the actual workhorse. It does everything needed to make a
# real, honest-to-gosh query page.
function doQuery( $offset, $limit ) {
global $wgUser, $wgOut, $wgLang, $wgRequest;
global $wgMiserMode;
$sname = $this->getName();
$fname = get_class($this) . "::doQuery";
$sql = $this->getSQL( $offset, $limit );
$wgOut->setSyndicated( true );
if ( $this->isExpensive() ) {
$type = wfStrencode( $sname );
$recache = $wgRequest->getBool( "recache" );
if( $recache ) {
# Clear out any old cached data
$res = wfQuery( "DELETE FROM querycache WHERE qc_type='$type'", DB_WRITE, $fname );
# Save results into the querycache table
$maxstored = 1000;
$res = wfQuery(
"INSERT INTO querycache(qc_type,qc_namespace,qc_title,qc_value) " .
$this->getSQL() .
$this->getOrderLimit( 0, $maxstored ),
DB_WRITE, $fname );
}
if( $wgMiserMode || $recache ) {
$sql =
"SELECT qc_type as type, qc_namespace as namespace,qc_title as title, qc_value as value
FROM querycache WHERE qc_type='$type'";
}
if( $wgMiserMode ) {
$wgOut->addWikiText( wfMsg( "perfcached" ) );
}
}
$res = wfQuery( $sql . $this->getOrderLimit( $offset, $limit ), DB_READ, $fname );
$num = wfNumRows($res);
$sk = $wgUser->getSkin( );
$top = wfShowingResults( $offset, $num);
$wgOut->addHTML( "<p>{$top}\n" );
# often disable 'next' link when we reach the end
if($num < $limit) { $atend = true; } else { $atend = false; }
$sl = wfViewPrevNext( $offset, $limit , $wgLang->specialPage( $sname ), "" ,$atend );
$wgOut->addHTML( "<br />{$sl}</p>\n" );
$s = "<ol start='" . ( $offset + 1 ) . "'>";
while ( $obj = wfFetchObject( $res ) ) {
$format = $this->formatResult( $sk, $obj );
$s .= "<li>{$format}</li>\n";
}
wfFreeResult( $res );
$s .= "</ol>";
$wgOut->addHTML( $s );
$wgOut->addHTML( "<p>{$sl}</p>\n" );
}
# Similar to above, but packaging in a syndicated feed instead of a web page
function doFeed( $class = "" ) {
global $wgFeedClasses;
global $wgOut, $wgLanguageCode, $wgLang;
if( isset($wgFeedClasses[$class]) ) {
$feed = new $wgFeedClasses[$class](
$this->feedTitle(),
$this->feedDesc(),
$this->feedUrl() );
$feed->outHeader();
$sql = $this->getSQL( 0, 50 );
$res = wfQuery( $sql, DB_READ, "QueryPage::doFeed" );
while( $obj = wfFetchObject( $res ) ) {
$item = $this->feedResult( $obj );
if( $item ) $feed->outItem( $item );
}
wfFreeResult( $res );
$feed->outFooter();
return true;
} else {
return false;
}
}
# Override for custom handling. If the titles/links are ok, just do feedItemDesc()
function feedResult( $row ) {
if( !isset( $row->title ) ) {
return NULL;
}
$title = Title::MakeTitle( IntVal( $row->namespace ), $row->title );
if( $title ) {
if( isset( $row->timestamp ) ) {
$date = $row->timestamp;
} else {
$date = "";
}
$comments = "";
if( $title ) {
$talkpage = $title->getTalkPage();
$comments = $talkpage->getFullURL();
}
return new FeedItem(
$title->getText(),
$this->feedItemDesc( $row ),
$title->getFullURL(),
$date,
$this->feedItemAuthor( $row ),
$comments);
} else {
return NULL;
}
}
function feedItemDesc( $row ) {
$text = "";
if( isset( $row->comment ) ) {
$text = htmlspecialchars( $row->comment );
} else {
$text = "";
}
if( isset( $row->text ) ) {
$text = "<p>" . htmlspecialchars( wfMsg( "summary" ) ) . ": " . $text . "</p>\n<hr />\n<div>" .
nl2br( htmlspecialchars( $row->text ) ) . "</div>";;
}
return $text;
}
function feedItemAuthor( $row ) {
if( isset( $row->user_text ) ) {
return $row->user_text;
} else {
return "";
}
}
function feedTitle() {
global $wgLanguageCode, $wgSitename, $wgLang;
$page = SpecialPage::getPage( $this->getName() );
$desc = $page->getDescription();
return "$wgSitename - $desc [$wgLanguageCode]";
}
function feedDesc() {
return wfMsg( "fromwikipedia" );
}
function feedUrl() {
global $wgLang;
$title = Title::MakeTitle( NS_SPECIAL, $this->getName() );
return $title->getFullURL();
}
}
# This is a subclass for very simple queries that are just looking for page
# titles that match some criteria. It formats each result item as a link to
# that page.
class PageQueryPage extends QueryPage {
function formatResult( $skin, $result ) {
$nt = Title::makeTitle( $result->namespace, $result->title );
return $skin->makeKnownLinkObj( $nt, "" );
}
}
?>
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