<?php
namespace Ctct;

/**
 * CtcSplClassLoader implementation that implements the technical interoperability
 * standards for PHP 5.3 namespaces and class names.
 *
 * http://groups.google.com/group/php-standards/web/final-proposal
 *
 *     // Example which loads classes for the Doctrine Common package in the
 *     // Doctrine\Common namespace.
 *     $classLoader = new CtcSplClassLoader('Doctrine\Common', '/path/to/doctrine');
 *     $classLoader->register();
 *
 * @author Jonathan H. Wage <jonwage@gmail.com>
 * @author Roman S. Borschel <roman@code-factory.org>
 * @author Matthew Weier O'Phinney <matthew@zend.com>
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 * @author Fabien Potencier <fabien.potencier@symfony-project.org>
 */

class CtcSplClassLoader {
    private $fileExtension = '.php';
    private $namespace;
    private $includePath;
    private $namespaceSeparator = '\\';

    /**
     * Creates a new <tt>CtcSplClassLoader</tt> that loads classes of the
     * specified namespace.
     *
     * @param string $ns The namespace to use.
     * @param string $includePath The include path to use.
     */
    public function __construct($ns = null, $includePath = null) {
        $this->namespace = $ns;
        $this->includePath = $includePath;
    }

    /**
     * Gets the namespace separator used by classes in the namespace of this class loader.
     *
     * @return string $namespaceSeparator
     */
    public function getNamespaceSeparator() {
        return $this->namespaceSeparator;
    }

    /**
     * Sets the namespace separator used by classes in the namespace of this class loader.
     *
     * @param string $sep The separator to use.
     */
    public function setNamespaceSeparator($sep) {
        $this->namespaceSeparator = $sep;
    }

    /**
     * Gets the base include path for all class files in the namespace of this class loader.
     *
     * @return string $includePath
     */
    public function getIncludePath() {
        return $this->includePath;
    }

    /**
     * Sets the base include path for all class files in the namespace of this class loader.
     *
     * @param string $includePath
     */
    public function setIncludePath($includePath) {
        $this->includePath = $includePath;
    }

    /**
     * Gets the file extension of class files in the namespace of this class loader.
     *
     * @return string $fileExtension
     */
    public function getFileExtension() {
        return $this->fileExtension;
    }

    /**
     * Sets the file extension of class files in the namespace of this class loader.
     *
     * @param string $fileExtension
     */
    public function setFileExtension($fileExtension) {
        $this->fileExtension = $fileExtension;
    }

    /**
     * Installs this class loader on the SPL autoload stack.
     */
    public function register() {
        spl_autoload_register(array($this, 'loadClass'));
    }

    /**
     * Uninstalls this class loader from the SPL autoloader stack.
     */
    public function unregister() {
        spl_autoload_unregister(array($this, 'loadClass'));
    }

    /**
     * Loads the given class or interface.
     *
     * @param string $className The name of the class to load.
     * @return void
     */
    public function loadClass($className) {
        if (null === $this->namespace || $this->namespace . $this->namespaceSeparator ===
            substr($className, 0, strlen($this->namespace . $this->namespaceSeparator))
        ) {
            $fileName = '';
            if (false !== ($lastNsPos = strripos($className, $this->namespaceSeparator))) {
                $namespace = substr($className, 0, $lastNsPos);
                $className = substr($className, $lastNsPos + 1);
                $fileName = str_replace($this->namespaceSeparator, DIRECTORY_SEPARATOR, $namespace)
                    . DIRECTORY_SEPARATOR;
            }
            $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . $this->fileExtension;

            require ($this->includePath !== null ? $this->includePath . DIRECTORY_SEPARATOR : '') . $fileName;
        }
    }
}
