<?php // $Id$
/**
 * Utility functions to make unit testing easier.
 * 
 * These functions, particularly the the database ones, are quick and
 * dirty methods for getting things done in test cases. None of these 
 * methods should be used outside test code.
 *
 * @copyright &copy; 2006 The Open University
 * @author T.J.Hunt@open.ac.uk
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @version $Id$
 * @package SimpleTestEx
 */

require_once(dirname(__FILE__) . '/../config.php');
require_once($CFG->libdir . '/simpletestlib/simpletest.php');
require_once($CFG->libdir . '/simpletestlib/unit_tester.php');
require_once($CFG->libdir . '/simpletestlib/expectation.php');
require_once($CFG->libdir . '/simpletestlib/reporter.php');
require_once($CFG->libdir . '/simpletestlib/web_tester.php');
require_once($CFG->libdir . '/simpletestlib/mock_objects.php');

/**
 * Recursively visit all the files in the source tree. Calls the callback
 * function with the pathname of each file found. 
 * 
 * @param $path the folder to start searching from. 
 * @param $callback the function to call with the name of each file found.
 * @param $fileregexp a regexp used to filter the search (optional).
 * @param $exclude If true, pathnames that match the regexp will be ingored. If false, 
 *     only files that match the regexp will be included. (default false).
 * @param array $ignorefolders will not go into any of these folders (optional).
 */ 
function recurseFolders($path, $callback, $fileregexp = '/.*/', $exclude = false, $ignorefolders = array()) {
    $files = scandir($path);

    foreach ($files as $file) {
        $filepath = $path .'/'. $file;
        if ($file == '.' || $file == '..') {
            continue;
        } else if (is_dir($filepath)) {
            if (!in_array($filepath, $ignorefolders)) {
                recurseFolders($filepath, $callback, $fileregexp, $exclude, $ignorefolders);
            }
        } else if ($exclude xor preg_match($fileregexp, $filepath)) {
            call_user_func($callback, $filepath);
        }
    }
}

/**
 * An expectation for comparing strings ignoring whitespace.
 */
class IgnoreWhitespaceExpectation extends SimpleExpectation {
    var $expect;

    function IgnoreWhitespaceExpectation($content, $message = '%s') {
        $this->SimpleExpectation($message);
        $this->expect=$this->normalise($content);
    }

    function test($ip) {
        return $this->normalise($ip)==$this->expect;
    }

    function normalise($text) {
        return preg_replace('/\s+/m',' ',trim($text));
    }

    function testMessage($ip) {
        return "Input string [$ip] doesn't match the required value.";
    }
}

/**
 * An Expectation that two arrays contain the same list of values.
 */
class ArraysHaveSameValuesExpectation extends SimpleExpectation {
    var $expect;

    function ArraysHaveSameValuesExpectation($expected, $message = '%s') {
        $this->SimpleExpectation($message);
        if (!is_array($expected)) {
            trigger_error('Attempt to create an ArraysHaveSameValuesExpectation ' .
                    'with an expected value that is not an array.');
        }
        $this->expect = $this->normalise($expected);
    }

    function test($actual) {
        return $this->normalise($actual) == $this->expect;
    }

    function normalise($array) {
        sort($array);
        return $array;
    }

    function testMessage($actual) {
        return 'Array [' . implode(', ', $actual) .
                '] does not contain the expected list of values [' . implode(', ', $this->expect) . '].';
    }
}

/**
 * An Expectation that compares to objects, and ensures that for every field in the
 * expected object, there is a key of the same name in the actual object, with
 * the same value. (The actual object may have other fields to, but we ignore them.)
 */
class CheckSpecifiedFieldsExpectation extends SimpleExpectation {
    var $expect;

    function CheckSpecifiedFieldsExpectation($expected, $message = '%s') {
        $this->SimpleExpectation($message);
        if (!is_object($expected)) {
            trigger_error('Attempt to create a CheckSpecifiedFieldsExpectation ' .
                    'with an expected value that is not an object.');
        }
        $this->expect = $expected;
    }

    function test($actual) {
        foreach ($this->expect as $key => $value) {
            if (isset($value) && isset($actual->$key) && $actual->$key == $value) {
                // OK
            } else if (is_null($value) && is_null($actual->$key)) {
                // OK
            } else {
                return false;
            }
        }
        return true;
    }

    function testMessage($actual) {
        $mismatches = array();
        foreach ($this->expect as $key => $value) {
            if (isset($value) && isset($actual->$key) && $actual->$key == $value) {
                // OK
            } else if (is_null($value) && is_null($actual->$key)) {
                // OK
            } else {
                $mismatches[] = $key;
            }
        }
        return 'Actual object does not have all the same fields with the same values as the expected object (' .
                implode(', ', $mismatches) . ').';
    }
}

?>