Return a DOMElement instead of a string in Tweeper::generateEnclosure()

[tweeper.git] / tweeper.php

diff --git a/tweeper.php b/tweeper.php
index f1a4ba9..579aae1 100644 (file)
--- a/tweeper.php
+++ b/tweeper.php
@@ -65,6 +65,15 @@ class Tweeper {
   }
 
   /**
+   * Convert string to UpperCamelCase.
+   */
+  public static function toUpperCamelCase($str, $delim = ' ') {
+    $str_upper = ucwords($str, $delim);
+    $str_camel_case = str_replace($delim, '', $str_upper);
+    return $str_camel_case;
+  }
+
+  /**
    * Get the contents from a URL.
    */
   private static function getUrlContents($url) {
@@ -147,15 +156,13 @@ class Tweeper {
     $enc->setAttribute('length', $url_info['download_content_length']);
     $enc->setAttribute('type', $url_info['content_type']);
 
-    $dom->appendChild($enc);
-
-    return $dom->saveXML($enc);
+    return $enc;
   }
 
   /**
    * Mimic the message from libxml.c::php_libxml_ctx_error_level()
    */
-  private function logXmlError($error) {
+  private static function logXmlError($error) {
     $output = "";
 
     switch ($error->level) {
@@ -187,32 +194,9 @@ class Tweeper {
   }
 
   /**
-   * Load a stylesheet if the web site is supported.
+   * Convert json to XML.
    */
-  private function loadStylesheet($host) {
-    $stylesheet = "file://" . __DIR__ . "/rss_converter_" . $host . ".xsl";
-    if (FALSE === file_exists($stylesheet)) {
-      trigger_error("Conversion to RSS not supported for $host ($stylesheet not found)", E_USER_ERROR);
-      return NULL;
-    }
-
-    $stylesheet_contents = $this->getUrlContents($stylesheet);
-
-    $xslDoc = new DOMDocument();
-    $xslDoc->loadXML($stylesheet_contents);
-
-    $xsltProcessor = new XSLTProcessor();
-    $xsltProcessor->registerPHPFunctions();
-    $xsltProcessor->setParameter('', 'generate-enclosure', $this->generate_enclosure);
-    $xsltProcessor->importStylesheet($xslDoc);
-
-    return $xsltProcessor;
-  }
-
-  /**
-   * Convert json to xml.
-   */
-  private function jsonToXml($json, $root_node_name) {
+  private static function jsonToXml($json, $root_node_name) {
     // Apparently the ObjectNormalizer used afterwards is not able to handle
     // the stdClass object created by json_decode() with the default setting
     // $assoc = false; so use $assoc = true.
@@ -243,7 +227,7 @@ class Tweeper {
   /**
    * Convert the Instagram content to XML.
    */
-  private function get_xml_instagram_com($html) {
+  private function getXmlInstagramCom($html) {
     // Extract the json data from the html code.
     $json_match_expr = '/window._sharedData = (.*);/';
     $ret = preg_match($json_match_expr, $html, $matches);
@@ -252,13 +236,13 @@ class Tweeper {
       return NULL;
     }
 
-    return $this->jsonToXml($matches[1], 'instagram');
+    return Tweeper::jsonToXml($matches[1], 'instagram');
   }
 
   /**
    * Make the Facebook HTML processable.
    */
-  private function preprocess_html_facebook_com($html) {
+  private function preprocessHtmlFacebookCom($html) {
     $html = str_replace('<!--', '', $html);
     $html = str_replace('-->', '', $html);
     return $html;
@@ -273,8 +257,8 @@ class Tweeper {
     // Handle warnings and errors when loading invalid HTML.
     $xml_errors_value = libxml_use_internal_errors(TRUE);
 
-    // If there is a host-specific method to get the xml data, use it!
-    $get_xml_host_method = 'get_xml_' . str_replace(".", "_", $host);
+    // If there is a host-specific method to get the XML data, use it!
+    $get_xml_host_method = 'getXml' . Tweeper::toUpperCamelCase($host, '.');
     if (method_exists($this, $get_xml_host_method)) {
       $xml_data = call_user_func_array(array($this, $get_xml_host_method), array($html));
       $xmlDoc->loadXML($xml_data);
@@ -284,7 +268,7 @@ class Tweeper {
     }
 
     foreach (libxml_get_errors() as $xml_error) {
-      $this->logXmlError($xml_error);
+      Tweeper::logXmlError($xml_error);
     }
     libxml_clear_errors();
     libxml_use_internal_errors($xml_errors_value);
@@ -293,6 +277,29 @@ class Tweeper {
   }
 
   /**
+   * Load a stylesheet if the web site is supported.
+   */
+  private function loadStylesheet($host) {
+    $stylesheet = "file://" . __DIR__ . "/rss_converter_" . $host . ".xsl";
+    if (FALSE === file_exists($stylesheet)) {
+      trigger_error("Conversion to RSS not supported for $host ($stylesheet not found)", E_USER_ERROR);
+      return NULL;
+    }
+
+    $stylesheet_contents = Tweeper::getUrlContents($stylesheet);
+
+    $xslDoc = new DOMDocument();
+    $xslDoc->loadXML($stylesheet_contents);
+
+    $xsltProcessor = new XSLTProcessor();
+    $xsltProcessor->registerPHPFunctions();
+    $xsltProcessor->setParameter('', 'generate-enclosure', $this->generate_enclosure);
+    $xsltProcessor->importStylesheet($xslDoc);
+
+    return $xsltProcessor;
+  }
+
+  /**
    * Convert the site content to RSS.
    */
   public function tweep($src_url) {
@@ -310,12 +317,12 @@ class Tweeper {
       return NULL;
     }
 
-    $html = $this->getUrlContents($src_url);
+    $html = Tweeper::getUrlContents($src_url);
     if (FALSE === $html) {
       return NULL;
     }
 
-    $preprocess_html_host_method = 'preprocess_html_' . str_replace(".", "_", $host);
+    $preprocess_html_host_method = 'preprocessHtml' . Tweeper::toUpperCamelCase($host, '.');
     if (method_exists($this, $preprocess_html_host_method)) {
       $html = call_user_func_array(array($this, $preprocess_html_host_method), array($html));
     }