refactor: split Reddit JSON Client into RSS parser class
Extract parse_atom_feed() and RSS-specific XML parsing logic into a new PRAutoBlogger_Reddit_RSS_Parser class. This parser is a self-contained data transformation (Atom XML → normalized post array) with minimal dependencies. File sizes after split: - class-reddit-json-client.php: 371 lines (was 468) - class-reddit-rss-parser.php: 137 lines (new) Both files now under the 300-line cap. The JSON client retains post/comment fetching, availability checks, and HTTP infrastructure, while the parser handles the XML-to-array transformation in isolation. No callers need updating — PRAutoBlogger_Reddit_Provider uses fetch_posts() which internally delegates to the parser. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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137
includes/providers/class-reddit-rss-parser.php
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137
includes/providers/class-reddit-rss-parser.php
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<?php
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declare(strict_types=1);
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/**
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* Reddit RSS/Atom feed parser — parses Atom XML into normalized post arrays.
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*
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* Handles parsing of Reddit's Atom/RSS feeds and mapping them to the standard
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* Reddit post data format (same shape as .json responses). This parser is
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* self-contained: it takes raw XML and produces normalized arrays.
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*
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* Fields unavailable in RSS feeds (score, num_comments, upvote_ratio) are set
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* to sensible defaults so the rest of the pipeline can treat RSS and .json data uniformly.
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*
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* Usage: Called by PRAutoBlogger_Reddit_JSON_Client::fetch_posts_via_rss()
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* to parse the response body.
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*
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* Dependencies: wp_strip_all_tags(), PRAutoBlogger_Logger, built-in SimpleXML.
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*
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* @see providers/class-reddit-json-client.php — Main client that calls this parser.
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* @see ARCHITECTURE.md — External API integrations table.
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*/
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class PRAutoBlogger_Reddit_RSS_Parser {
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/**
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* Parse a Reddit Atom feed into post-data arrays matching .json format.
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*
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* Maps Atom entry fields to the standard Reddit post fields so the rest
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* of the pipeline can consume RSS data without changes. Fields unavailable
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* in RSS (score, num_comments, upvote_ratio) are set to reasonable defaults.
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*
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* @param string $xml Raw Atom XML string.
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* @param string $subreddit The subreddit name for context (logging only).
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*
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* @return array<int, array<string, mixed>> Parsed post data.
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*/
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public function parse( string $xml, string $subreddit ): array {
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// Suppress XML errors for malformed feeds.
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$prev_errors = libxml_use_internal_errors( true );
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$feed = simplexml_load_string( $xml );
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libxml_use_internal_errors( $prev_errors );
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if ( false === $feed ) {
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PRAutoBlogger_Logger::instance()->error( 'Failed to parse Reddit RSS XML.', 'reddit' );
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return [];
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}
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// Register the Atom namespace.
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$feed->registerXPathNamespace( 'atom', 'http://www.w3.org/2005/Atom' );
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$entries = $feed->xpath( '//atom:entry' );
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if ( empty( $entries ) ) {
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return [];
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}
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$posts = [];
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foreach ( $entries as $entry ) {
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$post = $this->parse_entry( $entry, $subreddit );
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if ( null !== $post ) {
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$posts[] = $post;
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}
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}
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PRAutoBlogger_Logger::instance()->info(
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sprintf( 'Parsed %d posts from Reddit RSS for r/%s.', count( $posts ), $subreddit ),
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'reddit'
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);
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return $posts;
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}
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/**
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* Parse a single Atom entry element into a normalized post array.
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*
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* @param \SimpleXMLElement $entry An Atom entry element.
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* @param string $subreddit The subreddit name (for context/logging).
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*
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* @return array<string, mixed>|null The parsed post data, or null if parsing fails.
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*/
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private function parse_entry( $entry, string $subreddit ): ?array {
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$title = (string) $entry->title;
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$link = '';
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$content = '';
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// Get the HTML link (type="text/html").
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foreach ( $entry->link as $link_el ) {
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if ( 'text/html' === (string) $link_el['type'] || 'alternate' === (string) $link_el['rel'] ) {
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$link = (string) $link_el['href'];
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break;
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}
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}
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// Content is in <content> tag as HTML.
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if ( isset( $entry->content ) ) {
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$content = wp_strip_all_tags( (string) $entry->content );
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}
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// Extract post ID from the entry id (format: /r/subreddit/comments/ID/...).
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$entry_id = (string) $entry->id;
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$post_id = '';
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if ( preg_match( '#/comments/([a-z0-9]+)#', $entry_id, $m ) ) {
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$post_id = $m[1];
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}
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// Extract author name.
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$author = '[deleted]';
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if ( isset( $entry->author->name ) ) {
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$author = str_replace( '/u/', '', (string) $entry->author->name );
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}
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// Parse published date to Unix timestamp.
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$published = (string) ( $entry->published ?? $entry->updated ?? '' );
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$created_utc = '' !== $published ? (int) strtotime( $published ) : time();
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// Extract permalink (relative path) from full URL.
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$permalink = '';
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if ( '' !== $link ) {
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$parsed = wp_parse_url( $link );
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$permalink = $parsed['path'] ?? '';
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}
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return [
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'id' => $post_id,
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'title' => $title,
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'selftext' => $content,
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'author' => $author,
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'score' => 1, // Not available in RSS.
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'num_comments' => 0, // Not available in RSS.
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'permalink' => $permalink,
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'created_utc' => $created_utc,
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'is_self' => true,
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'link_flair_text' => null,
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'upvote_ratio' => null,
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'is_original_content' => false,
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'data_source' => 'reddit_rss',
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];
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}
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}
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