367 lines
11 KiB
PHP
367 lines
11 KiB
PHP
<?php
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namespace PicoFeed\Parser;
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use SimpleXMLElement;
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use PicoFeed\Filter\Filter;
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use PicoFeed\Client\Url;
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/**
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* Atom parser.
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*
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* @author Frederic Guillot
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*/
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class Atom extends Parser
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{
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/**
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* Supported namespaces.
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*/
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protected $namespaces = array(
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'atom' => 'http://www.w3.org/2005/Atom',
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);
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/**
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* Get the path to the items XML tree.
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*
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* @param SimpleXMLElement $xml Feed xml
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*
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* @return SimpleXMLElement
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*/
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public function getItemsTree(SimpleXMLElement $xml)
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{
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return XmlParser::getXPathResult($xml, 'atom:entry', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'entry');
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}
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/**
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* Find the feed url.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedUrl(SimpleXMLElement $xml, Feed $feed)
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{
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$feed->feed_url = $this->getUrl($xml, 'self');
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}
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/**
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* Find the site url.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findSiteUrl(SimpleXMLElement $xml, Feed $feed)
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{
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$feed->site_url = $this->getUrl($xml, 'alternate', true);
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}
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/**
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* Find the feed description.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedDescription(SimpleXMLElement $xml, Feed $feed)
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{
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$description = XmlParser::getXPathResult($xml, 'atom:subtitle', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'subtitle');
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$feed->description = (string) current($description);
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}
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/**
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* Find the feed logo url.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedLogo(SimpleXMLElement $xml, Feed $feed)
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{
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$logo = XmlParser::getXPathResult($xml, 'atom:logo', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'logo');
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$feed->logo = (string) current($logo);
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}
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/**
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* Find the feed icon.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedIcon(SimpleXMLElement $xml, Feed $feed)
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{
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$icon = XmlParser::getXPathResult($xml, 'atom:icon', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'icon');
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$feed->icon = (string) current($icon);
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}
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/**
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* Find the feed title.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedTitle(SimpleXMLElement $xml, Feed $feed)
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{
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$title = XmlParser::getXPathResult($xml, 'atom:title', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'title');
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$feed->title = Filter::stripWhiteSpace((string) current($title)) ?: $feed->getSiteUrl();
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}
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/**
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* Find the feed language.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedLanguage(SimpleXMLElement $xml, Feed $feed)
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{
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$language = XmlParser::getXPathResult($xml, '*[not(self::atom:entry)]/@xml:lang', $this->namespaces)
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?: XmlParser::getXPathResult($xml, '@xml:lang');
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$feed->language = (string) current($language);
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}
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/**
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* Find the feed id.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedId(SimpleXMLElement $xml, Feed $feed)
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{
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$id = XmlParser::getXPathResult($xml, 'atom:id', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'id');
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$feed->id = (string) current($id);
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}
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/**
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* Find the feed date.
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*
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* @param SimpleXMLElement $xml Feed xml
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findFeedDate(SimpleXMLElement $xml, Feed $feed)
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{
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$updated = XmlParser::getXPathResult($xml, 'atom:updated', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'updated');
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$feed->date = $this->date->getDateTime((string) current($updated));
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}
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/**
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* Find the item date.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param Item $item Item object
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findItemDate(SimpleXMLElement $entry, Item $item, Feed $feed)
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{
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$published = XmlParser::getXPathResult($entry, 'atom:published', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'published');
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$updated = XmlParser::getXPathResult($entry, 'atom:updated', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'updated');
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$published = !empty($published) ? $this->date->getDateTime((string) current($published)) : null;
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$updated = !empty($updated) ? $this->date->getDateTime((string) current($updated)) : null;
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if ($published === null && $updated === null) {
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$item->date = $feed->getDate(); // We use the feed date if there is no date for the item
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} elseif ($published !== null && $updated !== null) {
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$item->date = max($published, $updated); // We use the most recent date between published and updated
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} else {
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$item->date = $updated ?: $published;
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}
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}
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/**
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* Find the item title.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param Item $item Item object
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*/
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public function findItemTitle(SimpleXMLElement $entry, Item $item)
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{
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$title = XmlParser::getXPathResult($entry, 'atom:title', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'title');
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$item->title = Filter::stripWhiteSpace((string) current($title)) ?: $item->url;
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}
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/**
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* Find the item author.
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*
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* @param SimpleXMLElement $xml Feed
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* @param SimpleXMLElement $entry Feed item
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* @param \PicoFeed\Parser\Item $item Item object
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*/
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public function findItemAuthor(SimpleXMLElement $xml, SimpleXMLElement $entry, Item $item)
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{
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$author = XmlParser::getXPathResult($entry, 'atom:author/atom:name', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'author/name')
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?: XmlParser::getXPathResult($xml, 'atom:author/atom:name', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'author/name');
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$item->author = (string) current($author);
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}
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/**
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* Find the item content.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param \PicoFeed\Parser\Item $item Item object
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*/
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public function findItemContent(SimpleXMLElement $entry, Item $item)
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{
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$item->content = $this->getContent($entry);
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}
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/**
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* Find the item URL.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param \PicoFeed\Parser\Item $item Item object
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*/
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public function findItemUrl(SimpleXMLElement $entry, Item $item)
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{
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$item->url = $this->getUrl($entry, 'alternate', true);
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}
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/**
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* Genereate the item id.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param \PicoFeed\Parser\Item $item Item object
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findItemId(SimpleXMLElement $entry, Item $item, Feed $feed)
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{
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$id = XmlParser::getXPathResult($entry, 'atom:id', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'id');
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if (!empty($id)) {
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$item->id = $this->generateId((string) current($id));
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} else {
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$item->id = $this->generateId(
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$item->getTitle(), $item->getUrl(), $item->getContent()
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);
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}
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}
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/**
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* Find the item enclosure.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param \PicoFeed\Parser\Item $item Item object
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findItemEnclosure(SimpleXMLElement $entry, Item $item, Feed $feed)
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{
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$enclosure = $this->findLink($entry, 'enclosure');
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if ($enclosure) {
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$item->enclosure_url = Url::resolve((string) $enclosure['href'], $feed->getSiteUrl());
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$item->enclosure_type = (string) $enclosure['type'];
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}
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}
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/**
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* Find the item language.
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*
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* @param SimpleXMLElement $entry Feed item
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* @param \PicoFeed\Parser\Item $item Item object
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* @param \PicoFeed\Parser\Feed $feed Feed object
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*/
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public function findItemLanguage(SimpleXMLElement $entry, Item $item, Feed $feed)
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{
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$language = XmlParser::getXPathResult($entry, './/@xml:lang');
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$item->language = (string) current($language) ?: $feed->language;
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}
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/**
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* Get the URL from a link tag.
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*
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* @param SimpleXMLElement $xml XML tag
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* @param string $rel Link relationship: alternate, enclosure, related, self, via
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*
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* @return string
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*/
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private function getUrl(SimpleXMLElement $xml, $rel, $fallback = false)
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{
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$link = $this->findLink($xml, $rel);
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if ($link) {
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return (string) $link['href'];
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}
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if ($fallback) {
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$link = $this->findLink($xml, '');
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return $link ? (string) $link['href'] : '';
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}
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return '';
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}
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/**
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* Get a link tag that match a relationship.
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*
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* @param SimpleXMLElement $xml XML tag
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* @param string $rel Link relationship: alternate, enclosure, related, self, via
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*
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* @return SimpleXMLElement|null
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*/
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private function findLink(SimpleXMLElement $xml, $rel)
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{
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$links = XmlParser::getXPathResult($xml, 'atom:link', $this->namespaces)
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?: XmlParser::getXPathResult($xml, 'link');
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foreach ($links as $link) {
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if ($rel === (string) $link['rel']) {
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return $link;
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}
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}
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return;
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}
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/**
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* Get the entry content.
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*
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* @param SimpleXMLElement $entry XML Entry
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*
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* @return string
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*/
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private function getContent(SimpleXMLElement $entry)
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{
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$content = current(
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XmlParser::getXPathResult($entry, 'atom:content', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'content')
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);
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if (!empty($content) && count($content->children())) {
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$xml_string = '';
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foreach ($content->children() as $child) {
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$xml_string .= $child->asXML();
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}
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return $xml_string;
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} elseif (trim((string) $content) !== '') {
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return (string) $content;
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}
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$summary = XmlParser::getXPathResult($entry, 'atom:summary', $this->namespaces)
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?: XmlParser::getXPathResult($entry, 'summary');
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return (string) current($summary);
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}
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}
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