First commit

modules/simpletest/tests/themes/engines/nyan_cat/nyan_cat.engine

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+<?php
+
+/**
+ * @file
+ * Handles integration of Nyan cat templates because we love kittens.
+ */
+
+/**
+ * Includes .theme file from themes.
+ */
+function nyan_cat_init($template) {
+  $file = dirname($template->filename) . '/template.theme';
+  if (file_exists($file)) {
+    include_once DRUPAL_ROOT . '/' . $file;
+  }
+}
+
+/**
+ * Implements hook_theme().
+ */
+function nyan_cat_theme($existing, $type, $theme, $path) {
+  $templates = drupal_find_theme_functions($existing, array($theme));
+  $templates += drupal_find_theme_templates($existing, '.nyan-cat.html', $path);
+  return $templates;
+}
+
+/**
+ * Implements hook_extension().
+ */
+function nyan_cat_extension() {
+  return '.nyan-cat.html';
+}
+
+/**
+ * Implements hook_render_template().
+ *
+ * @param string $template_file
+ *   The filename of the template to render.
+ * @param mixed[] $variables
+ *   A keyed array of variables that will appear in the output.
+ *
+ * @return string
+ *   The output generated by the template.
+ */
+function nyan_cat_render_template($template_file, $variables) {
+  $output = str_replace('div', 'nyancat', file_get_contents(DRUPAL_ROOT . '/' . $template_file));
+  foreach ($variables as $key => $variable) {
+    if (strpos($output, '9' . $key) !== FALSE) {
+      $output = str_replace('9' . $key, $variable, $output);
+    }
+  }
+  return $output;
+}