--- /dev/null
+<?php
+/**
+ * @file
+ * @author Niklas Laxström
+ * @license GPL-2.0+
+ */
+
+namespace LocalisationUpdate;
+
+/**
+ * Interface for file readers.
+ */
+interface Reader {
+ /**
+ * Returns a list of messages indexed by language code. Example
+ * array( 'en' => array( 'key' => 'value' ) );
+ * @param string $contents File contents as a string.
+ * @return array
+ */
+ public function parse( $contents );
+}