Handle errors and warnings from loadHTML()

[tweeper.git] / tweeper.php

diff --git a/tweeper.php b/tweeper.php
index 14c3a7a..e1483f1 100644 (file)
--- a/tweeper.php
+++ b/tweeper.php
@@ -51,12 +51,13 @@ class Tweeper {
   {
     $ch = curl_init($url);
     curl_setopt_array($ch, array(
-        CURLOPT_HEADER => FALSE,
-        CURLOPT_RETURNTRANSFER => TRUE,
-        CURLOPT_SSL_VERIFYHOST => FALSE,
-        CURLOPT_SSL_VERIFYPEER => FALSE,
-        CURLOPT_HTTPHEADER => array('Accept-language: en'),
-        CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
+      CURLOPT_HEADER => FALSE,
+      CURLOPT_FOLLOWLOCATION => TRUE,  // follow http redirects to get the real URL
+      CURLOPT_RETURNTRANSFER => TRUE,
+      CURLOPT_SSL_VERIFYHOST => FALSE,
+      CURLOPT_SSL_VERIFYPEER => FALSE,
+      CURLOPT_HTTPHEADER => array('Accept-language: en'),
+      CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
     ));
     $contents = curl_exec($ch);
     curl_close($ch);
@@ -68,13 +69,13 @@ class Tweeper {
   {
     $ch = curl_init($url);
     curl_setopt_array($ch, array(
-        CURLOPT_HEADER => TRUE,
-        CURLOPT_NOBODY => TRUE,
-        CURLOPT_FOLLOWLOCATION => TRUE,  // follow http redirects to get the real URL
-        CURLOPT_RETURNTRANSFER => TRUE,
-        CURLOPT_SSL_VERIFYHOST => FALSE,
-        CURLOPT_SSL_VERIFYPEER => FALSE,
-        CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
+      CURLOPT_HEADER => TRUE,
+      CURLOPT_NOBODY => TRUE,
+      CURLOPT_FOLLOWLOCATION => TRUE,  // follow http redirects to get the real URL
+      CURLOPT_RETURNTRANSFER => TRUE,
+      CURLOPT_SSL_VERIFYHOST => FALSE,
+      CURLOPT_SSL_VERIFYPEER => FALSE,
+      CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
     ));
     curl_exec($ch);
     $url_info = curl_getinfo($ch);
@@ -121,11 +122,48 @@ class Tweeper {
     return $dom->saveXML($enc);
   }
 
+  /* Mimic the message from libxml.c::php_libxml_ctx_error_level() */
+  private function log_xml_error($error) {
+    $output = "";
+
+    switch ($error->level) {
+    case LIBXML_ERR_WARNING:
+      $output .= "Warning $error->code: ";
+      break;
+    case LIBXML_ERR_ERROR:
+      $output .= "Error $error->code: ";
+      break;
+    case LIBXML_ERR_FATAL:
+      $output .= "Fatal Error $error->code: ";
+      break;
+    }
+
+    $output .= trim($error->message);
+
+    if ($error->file) {
+      $output .= " in $error->file";
+    } else {
+      $output .= " in Entity,";
+    }
+
+    $output .=" line $error->line";
+
+    error_log($output);
+  }
+
   public function tweep($uri) {
     $html = Tweeper::get_contents($uri);
 
     $xmlDoc = new DOMDocument();
+
+    // Handle warnings and errors when loading invalid HTML.
+    $xml_errors_value = libxml_use_internal_errors(true);
     $xmlDoc->loadHTML($html);
+    foreach (libxml_get_errors() as $xml_error) {
+      $this->log_xml_error($xml_error);
+    }
+    libxml_clear_errors();
+    libxml_use_internal_errors($xml_errors_value);
 
     $output = $this->xsltProcessor->transformToXML($xmlDoc);