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<?php
/**
* Displays an interface to let the user export pages from the wiki in XML form
*
* @author Yaron Koren
*/
class DTViewXML extends SpecialPage {
/**
* Constructor
*/
public function __construct( $name = 'ViewXML' ) {
parent::__construct( $name );
}
function execute( $query ) {
$this->setHeaders();
$this->doSpecialViewXML( $query );
}
static function getCategoriesList() {
$dbr = wfGetDB( DB_SLAVE );
$categorylinks = $dbr->tableName( 'categorylinks' );
$res = $dbr->query( "SELECT DISTINCT cl_to FROM $categorylinks" );
$categories = array();
while ( $row = $dbr->fetchRow( $res ) ) {
$categories[] = $row[0];
}
$dbr->freeResult( $res );
sort( $categories );
return $categories;
}
static function getNamespacesList() {
$dbr = wfGetDB( DB_SLAVE );
$page = $dbr->tableName( 'page' );
$res = $dbr->query( "SELECT DISTINCT page_namespace FROM $page" );
$namespaces = array();
while ( $row = $dbr->fetchRow( $res ) ) {
$namespaces[] = $row[0];
}
$dbr->freeResult( $res );
return $namespaces;
}
/*
* Get all the pages that belong to a category and all its
* subcategories, down a certain number of levels - heavily based
* on SMW's SMWInlineQuery::includeSubcategories()
*/
static function getPagesForCategory( $top_category, $num_levels ) {
if ( 0 == $num_levels ) return $top_category;
$db = wfGetDB( DB_SLAVE );
$fname = "getPagesForCategory";
$categories = array( $top_category );
$checkcategories = array( $top_category );
$titles = array();
for ( $level = $num_levels; $level > 0; $level-- ) {
$newcategories = array();
foreach ( $checkcategories as $category ) {
$res = $db->select( // make the query
array( 'categorylinks', 'page' ),
array( 'page_id', 'page_title', 'page_namespace' ),
array( 'cl_from = page_id',
'cl_to = ' . $db->addQuotes( $category )
),
$fname
);
if ( $res ) {
while ( $row = $db->fetchRow( $res ) ) {
if ( array_key_exists( 'page_title', $row ) ) {
$page_namespace = $row['page_namespace'];
if ( $page_namespace == NS_CATEGORY ) {
$new_category = $row[ 'page_title' ];
if ( !in_array( $new_category, $categories ) ) {
$newcategories[] = $new_category;
}
} else {
$titles[] = Title::newFromID( $row['page_id'] );
}
}
}
$db->freeResult( $res );
}
}
if ( count( $newcategories ) == 0 ) {
return $titles;
} else {
$categories = array_merge( $categories, $newcategories );
}
$checkcategories = array_diff( $newcategories, array() );
}
return $titles;
}
static function getPagesForNamespace( $namespace ) {
$dbr = wfGetDB( DB_SLAVE );
$page = $dbr->tableName( 'page' );
$res = $dbr->query( "SELECT page_id FROM $page WHERE page_namespace = '$namespace'" );
$titles = array();
while ( $row = $dbr->fetchRow( $res ) ) {
$titles[] = Title::newFromID( $row[0] );
}
$dbr->freeResult( $res );
return $titles;
}
/**
* Helper function for getXMLForPage()
*/
static function treeContainsElement( $tree, $element ) {
// escape out if there's no tree (i.e., category)
if ( $tree == null ) {
return false;
}
foreach ( $tree as $node => $child_tree ) {
if ( $node === $element ) {
return true;
} elseif ( count( $child_tree ) > 0 ) {
if ( self::treeContainsElement( $child_tree, $element ) ) {
return true;
}
}
}
// no match found
return false;
}
static function getXMLForPage( $title, $simplified_format, $depth = 0 ) {
if ( $depth > 5 ) { return ""; }
$pageStructure = DTPageStructure::newFromTitle( $title );
$text = $pageStructure->toXML( $simplified_format );
// escape back the curly brackets that were escaped out at the beginning
$text = str_replace( '&#123;', '{', $text );
$text = str_replace( '&#125;', '}', $text );
return $text;
}
function doSpecialViewXML() {
global $wgContLang;
$out = $this->getOutput();
$request = $this->getRequest();
$namespace_labels = $wgContLang->getNamespaces();
$category_label = $namespace_labels[NS_CATEGORY];
$name_str = str_replace( ' ', '_', wfMessage( 'dt_xml_name' )->inContentLanguage()->text() );
$namespace_str = str_replace( ' ', '_', wfMessage( 'dt_xml_namespace' )->text() );
$pages_str = str_replace( ' ', '_', wfMessage( 'dt_xml_pages' )->inContentLanguage()->text() );
$form_submitted = false;
$cats = $request->getArray( 'categories' );
$nses = $request->getArray( 'namespaces' );
$requestedTitles = $request->getVal( 'titles' );
if ( ! empty( $cats ) || ! empty( $nses ) || $requestedTitles != null ) {
$form_submitted = true;
}
if ( $form_submitted ) {
$out->disable();
// Cancel output buffering and gzipping if set
// This should provide safer streaming for pages with history
wfResetOutputBuffers();
header( "Content-type: application/xml; charset=utf-8" );
$simplified_format = $request->getVal( 'simplified_format' );
$text = "<$pages_str>";
if ( $cats ) {
foreach ( $cats as $cat => $val ) {
if ( $simplified_format )
$text .= '<' . str_replace( ' ', '_', $cat ) . ">\n";
else
$text .= "<$category_label $name_str=\"$cat\">\n";
$titles = self::getPagesForCategory( $cat, 10 );
foreach ( $titles as $title ) {
$text .= self::getXMLForPage( $title, $simplified_format );
}
if ( $simplified_format ) {
$text .= '</' . str_replace( ' ', '_', $cat ) . ">\n";
} else {
$text .= "</$category_label>\n";
}
}
}
if ( $nses ) {
foreach ( $nses as $ns => $val ) {
if ( $ns == 0 ) {
$ns_name = "Main";
} else {
$ns_name = MWNamespace::getCanonicalName( $ns );
}
if ( $simplified_format ) {
$text .= '<' . str_replace( ' ', '_', $ns_name ) . ">\n";
} else {
$text .= "<$namespace_str $name_str=\"$ns_name\">\n";
}
$titles = self::getPagesForNamespace( $ns );
foreach ( $titles as $title ) {
$text .= self::getXMLForPage( $title, $simplified_format );
}
if ( $simplified_format )
$text .= '</' . str_replace( ' ', '_', $ns_name ) . ">\n";
else
$text .= "</$namespace_str>\n";
}
}
// The user can specify a set of page names to view
// the XML of, using a "titles=" parameter, separated
// by "|", in the manner of the MediaWiki API.
// Hm... perhaps all of Special:ViewXML should just
// be replaced by an API action?
if ( $requestedTitles ) {
$pageNames = explode( '|', $requestedTitles );
foreach ( $pageNames as $pageName ) {
$title = Title::newFromText( $pageName );
$text .= self::getXMLForPage( $title, $simplified_format );
}
}
$text .= "</$pages_str>";
print $text;
} else {
// set 'title' as hidden field, in case there's no URL niceness
global $wgContLang;
$mw_namespace_labels = $wgContLang->getNamespaces();
$special_namespace = $mw_namespace_labels[NS_SPECIAL];
$text = <<<END
<form action="" method="get">
<input type="hidden" name="title" value="$special_namespace:ViewXML">
END;
$text .= "<p>" . wfMessage( 'dt_viewxml_docu' )->text() . "</p>\n";
$text .= "<h2>" . wfMessage( 'dt_viewxml_categories' )->text() . "</h2>\n";
$categories = self::getCategoriesList();
foreach ( $categories as $category ) {
$text .= Html::input( "categories[$category]", null, 'checkbox' );
$title = Title::makeTitle( NS_CATEGORY, $category );
$link = Linker::link( $title, htmlspecialchars( $title->getText() ) );
$text .= " $link<br />\n";
}
$text .= "<h2>" . wfMessage( 'dt_viewxml_namespaces' )->text() . "</h2>\n";
$namespaces = self::getNamespacesList();
foreach ( $namespaces as $nsCode ) {
if ( $nsCode === '0' ) {
$nsName = wfMessage( 'blanknamespace' )->escaped();
} else {
$nsName = htmlspecialchars( $wgContLang->getFormattedNsText( $nsCode ) );
if ( $nsName === '' ) continue;
}
$text .= Html::input( "namespaces[$nsCode]", null, 'checkbox' );
$text .= ' ' . str_replace( '_', ' ', $nsName ) . "<br />\n";
}
$text .= "<br /><p><label><input type=\"checkbox\" name=\"simplified_format\" /> " . wfMessage( 'dt_viewxml_simplifiedformat' )->text() . "</label></p>\n";
$text .= "<input type=\"submit\" value=\"" . wfMessage( 'viewxml' )->text() . "\">\n";
$text .= "</form>\n";
$out->addHTML( $text );
}
}
}
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