rss-bridge/bridges/LWNprevBridge.php

278 lines
8.5 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';
private $editionTimeStamp;
public function getURI()
{
return self::URI . 'free/bigpage';
}
private function jumpToNextTag(&$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());
$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 &&
$node->nodeName === 'h3' || (
!is_null($node->attributes) &&
!is_null($class = $node->attributes->getNamedItem('class')) &&
in_array($class->nodeValue, ['Cat1HL','Cat2HL'])
)
)
) {
$contentEnd = true;
} else {
$content .= $node->C14N();
}
}
$item['content'] = $content;
return $item;
}
private function getFeatureContents(&$html)
{
$items = [];
foreach ($html->getElementsByTagName('h3') as $title) {
if ($title->getAttribute('class') !== 'SummaryHL') {
continue;
}
$item = [];
$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;
}
// fall-through? Looks like a bug
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;
}
// fall-through? Looks like a bug
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 = [];
$cats = ['','',''];
foreach ($html->getElementsByTagName('p') as $newsletters) {
if ($newsletters->getAttribute('class') !== 'Cat3HL') {
continue;
}
$item = [];
$item['uri'] = self::URI . '#' . count($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, ['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 = [];
$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 = [];
$cats = ['','',''];
foreach ($html->getElementsByTagName('h2') as $title) {
if ($title->getAttribute('class') !== 'SummaryHL') {
continue;
}
$item = [];
$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;
}
}