#754760 by sun, chx, dmitrig01, manarth, EvanDonovan, derjochenmeyer, joachim: Fixed all possible problems with comment links, using new generatePermutations testing function.

1 files changed, 49 insertions, 0 deletions

diff --git a/modules/simpletest/drupal_web_test_case.php b/modules/simpletest/drupal_web_test_case.php
index 841451746..fa9917d77 100644
--- a/modules/simpletest/drupal_web_test_case.php
+++ b/modules/simpletest/drupal_web_test_case.php
@@ -578,6 +578,55 @@ abstract class DrupalTestCase {
     }
     return $str;
   }
+
+  /**
+   * Converts a list of possible parameters into a stack of permutations.
+   *
+   * Takes a list of parameters containing possible values, and converts all of
+   * them into a list of items containing every possible permutation.
+   *
+   * Example:
+   * @code
+   * $parameters = array(
+   *   'one' => array(0, 1),
+   *   'two' => array(2, 3),
+   * );
+   * $permutations = $this->permute($parameters);
+   * // Result:
+   * $permutations == array(
+   *   array('one' => 0, 'two' => 2),
+   *   array('one' => 1, 'two' => 2),
+   *   array('one' => 0, 'two' => 3),
+   *   array('one' => 1, 'two' => 3),
+   * )
+   * @endcode
+   *
+   * @param $parameters
+   *   An associative array of parameters, keyed by parameter name, and whose
+   *   values are arrays of parameter values.
+   *
+   * @return
+   *   A list of permutations, which is an array of arrays. Each inner array
+   *   contains the full list of parameters that have been passed, but with a
+   *   single value only.
+   */
+  public static function generatePermutations($parameters) {
+    $all_permutations = array(array());
+    foreach ($parameters as $parameter => $values) {
+      $new_permutations = array();
+      // Iterate over all values of the parameter.
+      foreach ($values as $value) {
+        // Iterate over all existing permutations.
+        foreach ($all_permutations as $permutation) {
+          // Add the new parameter value to existing permutations.
+          $new_permutations[] = $permutation + array($parameter => $value);
+        }
+      }
+      // Replace the old permutations with the new permutations.
+      $all_permutations = $new_permutations;
+    }
+    return $all_permutations;
+  }
 }
 
 /**