rss-bridge/bridges/LWNprevBridge.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';

    public 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;
        }
    }
}