MDL-49152 output: Templates for renderers (JS and PHP)

Mustache support for rendering templates from either php or js.

lib/outputcomponents.php

@@ -39,6 +39,28 @@ interface renderable {
     // intentionally empty
 }
 
+/**
+ * Interface marking other classes having the ability to export their data for use by templates.
+ *
+ * @copyright 2015 Damyon Wiese
+ * @package core
+ * @category output
+ * @since 2.9
+ */
+interface templatable {
+
+    /**
+     * Function to export the renderer data in a format that is suitable for a
+     * mustache template. This means:
+     * 1. No complex types - only stdClass, array, int, string, float, bool
+     * 2. Any additional info that is required for the template is pre-calculated (e.g. capability checks).
+     *
+     * @param renderer_base $output Used to do a final render of any components that need to be rendered for export.
+     * @return stdClass|array
+     */
+    public function export_for_template(renderer_base $output);
+}
+
 /**
  * Data structure representing a file picker.
  *
@@ -602,6 +624,16 @@ class single_button implements renderable {
      */
     var $actions = array();
 
+    /**
+     * @var array $params URL Params
+     */
+    var $params;
+
+    /**
+     * @var string Action id
+     */
+    var $actionid;
+
     /**
      * Constructor
      * @param moodle_url $url