<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Constraint that checks a simple object with an isEqual constrain, allowing for exceptions to be made for some fields.
 *
 * @package    core
 * @category   phpunit
 * @copyright  2015 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */


/**
 * Constraint that checks a simple object with an isEqual constrain, allowing for exceptions to be made for some fields.
 *
 * @package    core
 * @category   phpunit
 * @copyright  2015 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class phpunit_constraint_object_is_equal_with_exceptions extends PHPUnit_Framework_Constraint_IsEqual {

    /**
     * @var array $keys The list of exceptions.
     */
    protected $keys = array();

    /**
     * Add an exception for the named key to use a different comparison
     * method. Any assertion provided by PHPUnit_Framework_Assert is
     * acceptable.
     *
     * @param string $key The key to except.
     * @param string $comparator The assertion to use.
     */
    public function add_exception($key, $comparator) {
        $this->keys[$key] = $comparator;
    }

    /**
     * Evaluates the constraint for parameter $other
     *
     * If $shouldreturnesult is set to false (the default), an exception is thrown
     * in case of a failure. null is returned otherwise.
     *
     * If $shouldreturnesult is true, the result of the evaluation is returned as
     * a boolean value instead: true in case of success, false in case of a
     * failure.
     *
     * @param  mixed    $other              Value or object to evaluate.
     * @param  string   $description        Additional information about the test
     * @param  bool     $shouldreturnesult  Whether to return a result or throw an exception
     * @return mixed
     * @throws PHPUnit_Framework_ExpectationFailedException
     */
    public function evaluate($other, $description = '', $shouldreturnesult = false) {
        foreach ($this->keys as $key => $comparison) {
            if (isset($other->$key) || isset($this->value->$key)) {
                // One of the keys is present, therefore run the comparison.
                PHPUnit_Framework_Assert::$comparison($this->value->$key, $other->$key);

                // Unset the keys, otherwise the standard evaluation will take place.
                unset($other->$key);
                unset($this->value->$key);
            }
        }

        // Run the parent evaluation (isEqual).
        return parent::evaluate($other, $description, $shouldreturnesult);
    }

}