mirror of
https://github.com/RSS-Bridge/rss-bridge.git
synced 2024-11-22 01:25:28 +03:00
278 lines
8.5 KiB
PHP
278 lines
8.5 KiB
PHP
<?php
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class LWNprevBridge extends BridgeAbstract
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{
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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 $editionTimeStamp;
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public function getURI()
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{
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return self::URI . 'free/bigpage';
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}
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private function jumpToNextTag(&$node)
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{
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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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{
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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 = $previousNode;
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}
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}
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public function collectData()
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{
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// Because the LWN page is written in loose HTML and not XHTML,
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// Simple HTML Dom is not accurate enough for the job
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$content = getContents($this->getURI());
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$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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{
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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 = $node->nextSibling;
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if (
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!$node || (
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$node->nodeType !== XML_TEXT_NODE &&
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$node->nodeName === 'h3' || (
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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, ['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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{
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$items = [];
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foreach ($html->getElementsByTagName('h3') as $title) {
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if ($title->getAttribute('class') !== 'SummaryHL') {
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continue;
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}
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$item = [];
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$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, &$cats)
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{
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$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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// fall-through? Looks like a bug
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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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// fall-through? Looks like a bug
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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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{
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$items = [];
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$cats = ['','',''];
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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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$item = [];
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$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 = $node->nextSibling;
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if (
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!$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, ['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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$item = [];
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$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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{
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$items = [];
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$cats = ['','',''];
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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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$item = [];
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$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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