Throw exception if file does not exist or is not a file

Author: martijnengler

src/Comment.php

@@ -204,6 +204,18 @@ public static function parse(string $json, bool $assoc = false, int $depth = 512
 
     public static function parseFromFile(string $file, bool $assoc = false, int $depth = 512, int $options = 0)
     {
+        if(!file_exists($file))
+        {
+            throw new \RuntimeException(sprintf("File %s does not exist", $file));
+        }
+
+
+        if(!is_file($file))
+        {
+            throw new \RuntimeException(sprintf("%s is not a file", $file));
+        }
+
+
         $json = \file_get_contents($file);
 
         return static::parse(\trim($json), $assoc, $depth, $options);