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<?php

/* An autoloader for ReCaptcha\Foo classes. This should be required()
 * by the user before attempting to instantiate any of the ReCaptcha
 * classes.
 *
 * BSD 3-Clause License
 * @copyright (c) 2019, Google Inc.
 * @link https://www.google.com/recaptcha
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

spl_autoload_register(function ($class) {
    if (substr($class, 0, 10) !== 'ReCaptcha\\') {
        /* If the class does not lie under the "ReCaptcha" namespace,
         * then we can exit immediately.
         */
        return;
    }

    /* All of the classes have names like "ReCaptcha\Foo", so we need
     * to replace the backslashes with frontslashes if we want the
     * name to map directly to a location in the filesystem.
     */
    $class = str_replace('\\', '/', $class);

    /* First, check under the current directory. It is important that
     * we look here first, so that we don't waste time searching for
     * test classes in the common case.
     */
    $path = dirname(__FILE__).'/'.$class.'.php';
    if (is_readable($path)) {
        require_once $path;

        return;
    }

    /* If we didn't find what we're looking for already, maybe it's
     * a test class?
     */
    $path = dirname(__FILE__).'/../tests/'.$class.'.php';
    if (is_readable($path)) {
        require_once $path;
    }
});