Build a standalone autoload file

src/Composer/Autoload/AutoloadGenerator.php

@@ -20,6 +20,7 @@ use Composer\Repository\RepositoryInterface;
 
 /**
  * @author Igor Wiedler <igor@wiedler.ch>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
  */
 class AutoloadGenerator
 {
@@ -42,11 +43,7 @@ class AutoloadGenerator
 <?php
 // autoload.php generated by composer
 
-if (false === class_exists('Symfony\Component\ClassLoader\UniversalClassLoader', false)) {
-    require __DIR__.'/../vendor/symfony/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';
-}
-
-use Symfony\Component\ClassLoader\UniversalClassLoader;
+namespace Composer\Autoloader;
 
 $loader = new UniversalClassLoader();
 
@@ -81,6 +78,276 @@ EOF;
         $file .= <<<'EOF'
 $loader->register();
 
+/*
+ * This class was taken from Symfony, the following license applies:
+ *
+ * Copyright (c) 2004-2011 Fabien Potencier
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * UniversalClassLoader implements a "universal" autoloader for PHP 5.3.
+ *
+ * It is able to load classes that use either:
+ *
+ *  * The technical interoperability standards for PHP 5.3 namespaces and
+ *    class names (http://groups.google.com/group/php-standards/web/psr-0-final-proposal);
+ *
+ *  * The PEAR naming convention for classes (http://pear.php.net/).
+ *
+ * Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be
+ * looked for in a list of locations to ease the vendoring of a sub-set of
+ * classes for large projects.
+ *
+ * Example usage:
+ *
+ *     $loader = new UniversalClassLoader();
+ *
+ *     // register classes with namespaces
+ *     $loader->registerNamespaces(array(
+ *         'Symfony\Component' => __DIR__.'/component',
+ *         'Symfony'           => __DIR__.'/framework',
+ *         'Sensio'            => array(__DIR__.'/src', __DIR__.'/vendor'),
+ *     ));
+ *
+ *     // register a library using the PEAR naming convention
+ *     $loader->registerPrefixes(array(
+ *         'Swift_' => __DIR__.'/Swift',
+ *     ));
+ *
+ *     // activate the autoloader
+ *     $loader->register();
+ *
+ * In this example, if you try to use a class in the Symfony\Component
+ * namespace or one of its children (Symfony\Component\Console for instance),
+ * the autoloader will first look for the class under the component/
+ * directory, and it will then fallback to the framework/ directory if not
+ * found before giving up.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class UniversalClassLoader
+{
+    private $namespaces = array();
+    private $prefixes = array();
+    private $namespaceFallbacks = array();
+    private $prefixFallbacks = array();
+
+    /**
+     * Gets the configured namespaces.
+     *
+     * @return array A hash with namespaces as keys and directories as values
+     */
+    public function getNamespaces()
+    {
+        return $this->namespaces;
+    }
+
+    /**
+     * Gets the configured class prefixes.
+     *
+     * @return array A hash with class prefixes as keys and directories as values
+     */
+    public function getPrefixes()
+    {
+        return $this->prefixes;
+    }
+
+    /**
+     * Gets the directory(ies) to use as a fallback for namespaces.
+     *
+     * @return array An array of directories
+     */
+    public function getNamespaceFallbacks()
+    {
+        return $this->namespaceFallbacks;
+    }
+
+    /**
+     * Gets the directory(ies) to use as a fallback for class prefixes.
+     *
+     * @return array An array of directories
+     */
+    public function getPrefixFallbacks()
+    {
+        return $this->prefixFallbacks;
+    }
+
+    /**
+     * Registers the directory to use as a fallback for namespaces.
+     *
+     * @param array $dirs An array of directories
+     *
+     * @api
+     */
+    public function registerNamespaceFallbacks(array $dirs)
+    {
+        $this->namespaceFallbacks = $dirs;
+    }
+
+    /**
+     * Registers the directory to use as a fallback for class prefixes.
+     *
+     * @param array $dirs An array of directories
+     *
+     * @api
+     */
+    public function registerPrefixFallbacks(array $dirs)
+    {
+        $this->prefixFallbacks = $dirs;
+    }
+
+    /**
+     * Registers an array of namespaces
+     *
+     * @param array $namespaces An array of namespaces (namespaces as keys and locations as values)
+     *
+     * @api
+     */
+    public function registerNamespaces(array $namespaces)
+    {
+        foreach ($namespaces as $namespace => $locations) {
+            $this->namespaces[$namespace] = (array) $locations;
+        }
+    }
+
+    /**
+     * Registers a namespace.
+     *
+     * @param string       $namespace The namespace
+     * @param array|string $paths     The location(s) of the namespace
+     *
+     * @api
+     */
+    public function registerNamespace($namespace, $paths)
+    {
+        $this->namespaces[$namespace] = (array) $paths;
+    }
+
+    /**
+     * Registers an array of classes using the PEAR naming convention.
+     *
+     * @param array $classes An array of classes (prefixes as keys and locations as values)
+     *
+     * @api
+     */
+    public function registerPrefixes(array $classes)
+    {
+        foreach ($classes as $prefix => $locations) {
+            $this->prefixes[$prefix] = (array) $locations;
+        }
+    }
+
+    /**
+     * Registers a set of classes using the PEAR naming convention.
+     *
+     * @param string       $prefix  The classes prefix
+     * @param array|string $paths   The location(s) of the classes
+     *
+     * @api
+     */
+    public function registerPrefix($prefix, $paths)
+    {
+        $this->prefixes[$prefix] = (array) $paths;
+    }
+
+    /**
+     * Registers this instance as an autoloader.
+     *
+     * @param Boolean $prepend Whether to prepend the autoloader or not
+     *
+     * @api
+     */
+    public function register($prepend = false)
+    {
+        spl_autoload_register(array($this, 'loadClass'), true, $prepend);
+    }
+
+    /**
+     * Loads the given class or interface.
+     *
+     * @param string $class The name of the class
+     */
+    public function loadClass($class)
+    {
+        if ($file = $this->findFile($class)) {
+            require $file;
+        }
+    }
+
+    /**
+     * Finds the path to the file where the class is defined.
+     *
+     * @param string $class The name of the class
+     *
+     * @return string|null The path, if found
+     */
+    public function findFile($class)
+    {
+        if ('\\' == $class[0]) {
+            $class = substr($class, 1);
+        }
+
+        if (false !== $pos = strrpos($class, '\\')) {
+            // namespaced class name
+            $namespace = substr($class, 0, $pos);
+            foreach ($this->namespaces as $ns => $dirs) {
+                foreach ($dirs as $dir) {
+                    if (0 === strpos($namespace, $ns)) {
+                        $className = substr($class, $pos + 1);
+                        $file = $dir.DIRECTORY_SEPARATOR.str_replace('\\', DIRECTORY_SEPARATOR, $namespace).DIRECTORY_SEPARATOR.str_replace('_', DIRECTORY_SEPARATOR, $className).'.php';
+                        if (file_exists($file)) {
+                            return $file;
+                        }
+                    }
+                }
+            }
+
+            foreach ($this->namespaceFallbacks as $dir) {
+                $file = $dir.DIRECTORY_SEPARATOR.str_replace('\\', DIRECTORY_SEPARATOR, $class).'.php';
+                if (file_exists($file)) {
+                    return $file;
+                }
+            }
+        } else {
+            // PEAR-like class name
+            foreach ($this->prefixes as $prefix => $dirs) {
+                foreach ($dirs as $dir) {
+                    if (0 === strpos($class, $prefix)) {
+                        $file = $dir.DIRECTORY_SEPARATOR.str_replace('_', DIRECTORY_SEPARATOR, $class).'.php';
+                        if (file_exists($file)) {
+                            return $file;
+                        }
+                    }
+                }
+            }
+
+            foreach ($this->prefixFallbacks as $dir) {
+                $file = $dir.DIRECTORY_SEPARATOR.str_replace('_', DIRECTORY_SEPARATOR, $class).'.php';
+                if (file_exists($file)) {
+                    return $file;
+                }
+            }
+        }
+    }
+}
 EOF;
 
         file_put_contents($targetFilename, $file);