Fix relative-path case where first segment contains a colon (#360)

Author: erayd

src/JsonSchema/Constraints/FormatConstraint.php

@@ -90,7 +90,7 @@ public function check(&$element, $schema = null, JsonPointer $path = null, $i =
                         $validURL = filter_var('scheme://host' . $element, FILTER_VALIDATE_URL, FILTER_NULL_ON_FAILURE);
                     } elseif (strlen($element)) { // relative-path reference
                         $pathParts = explode('/', $element, 2);
-                        if ($pathParts[0][0] !== '.' && strpos($pathParts[0], ':') !== false) {
+                        if (strpos($pathParts[0], ':') !== false) {
                             $validURL = null;
                         } else {
                             $validURL = filter_var('scheme://host/' . $element, FILTER_VALIDATE_URL, FILTER_NULL_ON_FAILURE);

tests/Constraints/FormatTest.php

@@ -126,7 +126,10 @@ public function getValidFormats()
             array('http://bluebox.org', 'uri'),
             array('//bluebox.org', 'uri'),
             array('/absolutePathReference/', 'uri'),
+            array('./relativePathReference/', 'uri'),
+            array('./relative:PathReference/', 'uri'),
             array('relativePathReference/', 'uri'),
+            array('relative/Path:Reference/', 'uri'),
 
             array('[email protected]', 'email'),
 
@@ -176,6 +179,7 @@ public function getInvalidFormats()
             array('1 123 4424', 'phone'),
 
             array('htt:/bluebox.org', 'uri'),
+            array('.relative:path/reference/', 'uri'),
             array('', 'uri'),
 
             array('info@somewhere', 'email'),