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