rss-bridge/bridges/LWNprevBridge.php
2017-02-14 17:28:07 +01:00

145 lines
3.6 KiB
PHP

<?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';
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');
libxml_use_internal_errors(true);
$html = new DOMDocument();
$html->loadHTML($content);
libxml_clear_errors();
$cat1 = '';
$cat2 = '';
foreach($html->getElementsByTagName('a') as $a){
if($a->textContent === 'Multi-page format'){
break;
}
}
$realURI = self::URI . $a->getAttribute('href');
$URICounter = 0;
$edition = $html->getElementsByTagName('h1')->item(0)->textContent;
$editionTimeStamp = strtotime(
substr($edition, strpos($edition, 'for ') + strlen('for '))
);
foreach($html->getElementsByTagName('h2') as $h2){
if($h2->getAttribute('class') !== 'SummaryHL'){
continue;
}
$item = array();
$h2NextSibling = $h2->nextSibling;
$this->jumpToNextTag($h2NextSibling);
switch($h2NextSibling->getAttribute('class')){
case 'FeatureByline':
$item['author'] = $h2NextSibling->getElementsByTagName('b')->item(0)->textContent;
break;
case 'GAByline':
$text = $h2NextSibling->textContent;
$item['author'] = substr($text, strpos($text, 'by '));
break;
default:
$item['author'] = 'LWN';
break;
};
$h2FirstChild = $h2->firstChild;
$this->jumpToNextTag($h2FirstChild);
if($h2FirstChild->nodeName === 'a'){
$item['uri'] = self::URI . $h2FirstChild->getAttribute('href');
}else{
$item['uri'] = $realURI . '#' . $URICounter;
}
$URICounter++;
$item['timestamp'] = $editionTimeStamp + $URICounter;
$h2PrevSibling = $h2->previousSibling;
$this->jumpToPreviousTag($h2PrevSibling);
switch($h2PrevSibling->getAttribute('class')){
case 'Cat2HL':
$cat2 = $h2PrevSibling->textContent;
$h2PrevSibling = $h2PrevSibling->previousSibling;
$this->jumpToPreviousTag($h2PrevSibling);
if($h2PrevSibling->getAttribute('class') !== 'Cat1HL'){
break;
}
$cat1 = $h2PrevSibling->textContent;
break;
case 'Cat1HL':
$cat1 = $h2PrevSibling->textContent;
$cat2 = '';
break;
default:
break;
}
$h2PrevSibling = null;
$item['title'] = '';
if(!empty($cat1)){
$item['title'] .= '[' . $cat1 . ($cat2 ? '/' . $cat2 : '') . '] ';
}
$item['title'] .= $h2->textContent;
$node = $h2;
$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;
$this->items[] = $item;
}
}
}