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- <?php
- class LWNprevBridge extends BridgeAbstract{
- const MAINTAINER = 'Pierre Mazière';
- const NAME = 'LWN Free Weekly Edition';
- const URI = 'https://lwn.net/';
- const CACHE_TIMEOUT = 604800; // 1 week
- const DESCRIPTION = 'LWN Free Weekly Edition available one week late';
- private $editionTimeStamp;
- function getURI(){
- return self::URI.'free/bigpage';
- }
- private function jumpToNextTag(&$node){
- while($node && $node->nodeType === XML_TEXT_NODE) {
- $nextNode = $node->nextSibling;
- if(!$nextNode) {
- break;
- }
- $node = $nextNode;
- }
- }
- private function jumpToPreviousTag(&$node){
- while($node && $node->nodeType === XML_TEXT_NODE) {
- $previousNode = $node->previousSibling;
- if(!$previousNode) {
- break;
- }
- $node = $previousNode;
- }
- }
- public function collectData(){
- // Because the LWN page is written in loose HTML and not XHTML,
- // Simple HTML Dom is not accurate enough for the job
- $content = getContents($this->getURI())
- or returnServerError('No results for LWNprev');
- $contents = explode('<b>Page editor</b>', $content);
- foreach($contents as $content) {
- if(strpos($content, '<html>') === false) {
- $content = <<<EOD
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html><head><title>LWN</title></head><body>{$content}</body></html>
- EOD;
- } else {
- $content = $content.'</body></html>';
- }
- libxml_use_internal_errors(true);
- $html = new DOMDocument();
- $html->loadHTML($content);
- libxml_clear_errors();
- $edition = $html->getElementsByTagName('h1');
- if($edition->length !== 0) {
- $text = $edition->item(0)->textContent;
- $this->editionTimeStamp = strtotime(
- substr($text, strpos($text, 'for ') + strlen('for '))
- );
- }
- if(strpos($content, 'Cat1HL') === false) {
- $items = $this->getFeatureContents($html);
- } elseif(strpos($content, 'Cat3HL') === false) {
- $items = $this->getBriefItems($html);
- } else {
- $items = $this->getAnnouncements($html);
- }
- $this->items = array_merge($this->items, $items);
- }
- }
- private function getArticleContent(&$title){
- $link = $title->firstChild;
- $this->jumpToNextTag($link);
- $item['uri'] = self::URI;
- if($link->nodeName === 'a') {
- $item['uri'] .= $link->getAttribute('href');
- }
- $item['timestamp'] = $this->editionTimeStamp;
- $node = $title;
- $content = '';
- $contentEnd = false;
- while(!$contentEnd) {
- $node = $node->nextSibling;
- if(!$node || (
- $node->nodeType !== XML_TEXT_NODE &&
- $node->nodeName === 'h2' || (
- !is_null($node->attributes) &&
- !is_null($class = $node->attributes->getNamedItem('class')) &&
- in_array($class->nodeValue, array('Cat1HL','Cat2HL'))
- )
- )
- ) {
- $contentEnd = true;
- } else {
- $content .= $node->C14N();
- }
- }
- $item['content'] = $content;
- return $item;
- }
- private function getFeatureContents(&$html){
- $items = array();
- foreach($html->getElementsByTagName('h2') as $title) {
- if($title->getAttribute('class') !== 'SummaryHL') {
- continue;
- }
- $item = array();
- $author = $title->nextSibling;
- $this->jumpToNextTag($author);
- if($author->getAttribute('class') === 'FeatureByline') {
- $item['author'] = $author->getElementsByTagName('b')->item(0)->textContent;
- } else {
- continue;
- }
- $item['title'] = $title->textContent;
- $items[] = array_merge($item, $this->getArticleContent($title));
- }
- return $items;
- }
- private function getItemPrefix(&$cat, &$cats){
- $cat1 = '';
- $cat2 = '';
- $cat3 = '';
- switch($cat->getAttribute('class')) {
- case 'Cat3HL':
- $cat3 = $cat->textContent;
- $cat = $cat->previousSibling;
- $this->jumpToPreviousTag($cat);
- $cats[2] = $cat3;
- if($cat->getAttribute('class') !== 'Cat2HL') {
- break;
- }
- case 'Cat2HL':
- $cat2 = $cat->textContent;
- $cat = $cat->previousSibling;
- $this->jumpToPreviousTag($cat);
- $cats[1] = $cat2;
- if(empty($cat3)) {
- $cats[2] = '';
- }
- if($cat->getAttribute('class') !== 'Cat1HL') {
- break;
- }
- case 'Cat1HL':
- $cat1 = $cat->textContent;
- $cats[0] = $cat1;
- if(empty($cat3)) {
- $cats[2] = '';
- }
- if(empty($cat2)) {
- $cats[1] = '';
- }
- break;
- default:
- break;
- }
- $prefix = '';
- if(!empty($cats[0])) {
- $prefix .= '['.$cats[0].($cats[1] ? '/'.$cats[1] : '').'] ';
- }
- return $prefix;
- }
- private function getAnnouncements(&$html){
- $items = array();
- $cats = array('','','');
- foreach($html->getElementsByTagName('p') as $newsletters) {
- if($newsletters->getAttribute('class') !== 'Cat3HL') {
- continue;
- }
- $item = array();
- $item['uri'] = self::URI.'#'.count($items);
- $item['timestamp'] = $this->editionTimeStamp;
- $item['author'] = 'LWN';
- $cat = $newsletters->previousSibling;
- $this->jumpToPreviousTag($cat);
- $prefix = $this->getItemPrefix($cat, $cats);
- $item['title'] = $prefix.' '.$newsletters->textContent;
- $node = $newsletters;
- $content = '';
- $contentEnd = false;
- while(!$contentEnd) {
- $node = $node->nextSibling;
- if(!$node || (
- $node->nodeType !== XML_TEXT_NODE && (
- !is_null($node->attributes) &&
- !is_null($class = $node->attributes->getNamedItem('class')) &&
- in_array($class->nodeValue, array('Cat1HL','Cat2HL','Cat3HL'))
- )
- )
- ) {
- $contentEnd = true;
- } else {
- $content .= $node->C14N();
- }
- }
- $item['content'] = $content;
- $items[] = $item;
- }
- foreach($html->getElementsByTagName('h2') as $title) {
- if($title->getAttribute('class') !== 'SummaryHL') {
- continue;
- }
- $item = array();
- $cat = $title->previousSibling;
- $this->jumpToPreviousTag($cat);
- $cat = $cat->previousSibling;
- $this->jumpToPreviousTag($cat);
- $prefix = $this->getItemPrefix($cat, $cats);
- $item['title'] = $prefix.' '.$title->textContent;
- $items[] = array_merge($item, $this->getArticleContent($title));
- }
- return $items;
- }
- private function getBriefItems(&$html){
- $items = array();
- $cats = array('','','');
- foreach($html->getElementsByTagName('h2') as $title) {
- if($title->getAttribute('class') !== 'SummaryHL') {
- continue;
- }
- $item = array();
- $cat = $title->previousSibling;
- $this->jumpToPreviousTag($cat);
- $cat = $cat->previousSibling;
- $this->jumpToPreviousTag($cat);
- $prefix = $this->getItemPrefix($cat, $cats);
- $item['title'] = $prefix.' '.$title->textContent;
- $items[] = array_merge($item, $this->getArticleContent($title));
- }
- return $items;
- }
- }
- ?>
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