321 lines
9.6 KiB
PHP
321 lines
9.6 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\ClassLoader;
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/**
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* ClassCollectionLoader.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class ClassCollectionLoader
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{
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private static $loaded;
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private static $seen;
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/**
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* Loads a list of classes and caches them in one big file.
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*
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* @param array $classes An array of classes to load
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* @param string $cacheDir A cache directory
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* @param string $name The cache name prefix
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* @param Boolean $autoReload Whether to flush the cache when the cache is stale or not
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* @param Boolean $adaptive Whether to remove already declared classes or not
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* @param string $extension File extension of the resulting file
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*
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* @throws \InvalidArgumentException When class can't be loaded
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*/
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public static function load($classes, $cacheDir, $name, $autoReload, $adaptive = false, $extension = '.php')
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{
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// each $name can only be loaded once per PHP process
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if (isset(self::$loaded[$name])) {
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return;
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}
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self::$loaded[$name] = true;
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$declared = array_merge(get_declared_classes(), get_declared_interfaces());
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if (function_exists('get_declared_traits')) {
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$declared = array_merge($declared, get_declared_traits());
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}
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if ($adaptive) {
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// don't include already declared classes
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$classes = array_diff($classes, $declared);
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// the cache is different depending on which classes are already declared
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$name = $name.'-'.substr(md5(implode('|', $classes)), 0, 5);
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}
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$classes = array_unique($classes);
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$cache = $cacheDir.'/'.$name.$extension;
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// auto-reload
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$reload = false;
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if ($autoReload) {
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$metadata = $cacheDir.'/'.$name.$extension.'.meta';
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if (!is_file($metadata) || !is_file($cache)) {
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$reload = true;
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} else {
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$time = filemtime($cache);
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$meta = unserialize(file_get_contents($metadata));
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sort($meta[1]);
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sort($classes);
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if ($meta[1] != $classes) {
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$reload = true;
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} else {
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foreach ($meta[0] as $resource) {
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if (!is_file($resource) || filemtime($resource) > $time) {
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$reload = true;
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break;
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}
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}
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}
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}
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}
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if (!$reload && is_file($cache)) {
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require_once $cache;
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return;
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}
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$files = array();
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$content = '';
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foreach (self::getOrderedClasses($classes) as $class) {
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if (in_array($class->getName(), $declared)) {
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continue;
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}
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$files[] = $class->getFileName();
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$c = preg_replace(array('/^\s*<\?php/', '/\?>\s*$/'), '', file_get_contents($class->getFileName()));
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// add namespace declaration for global code
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if (!$class->inNamespace()) {
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$c = "\nnamespace\n{\n".self::stripComments($c)."\n}\n";
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} else {
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$c = self::fixNamespaceDeclarations('<?php '.$c);
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$c = preg_replace('/^\s*<\?php/', '', $c);
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}
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$content .= $c;
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}
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// cache the core classes
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if (!is_dir(dirname($cache))) {
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mkdir(dirname($cache), 0777, true);
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}
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self::writeCacheFile($cache, '<?php '.$content);
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if ($autoReload) {
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// save the resources
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self::writeCacheFile($metadata, serialize(array($files, $classes)));
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}
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}
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/**
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* Adds brackets around each namespace if it's not already the case.
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*
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* @param string $source Namespace string
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*
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* @return string Namespaces with brackets
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*/
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public static function fixNamespaceDeclarations($source)
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{
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if (!function_exists('token_get_all')) {
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return $source;
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}
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$output = '';
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$inNamespace = false;
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$tokens = token_get_all($source);
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for ($i = 0, $max = count($tokens); $i < $max; $i++) {
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$token = $tokens[$i];
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if (is_string($token)) {
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$output .= $token;
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} elseif (in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
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// strip comments
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continue;
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} elseif (T_NAMESPACE === $token[0]) {
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if ($inNamespace) {
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$output .= "}\n";
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}
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$output .= $token[1];
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// namespace name and whitespaces
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while (($t = $tokens[++$i]) && is_array($t) && in_array($t[0], array(T_WHITESPACE, T_NS_SEPARATOR, T_STRING))) {
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$output .= $t[1];
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}
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if (is_string($t) && '{' === $t) {
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$inNamespace = false;
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--$i;
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} else {
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$output = rtrim($output);
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$output .= "\n{";
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$inNamespace = true;
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}
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} else {
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$output .= $token[1];
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}
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}
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if ($inNamespace) {
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$output .= "}\n";
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}
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return $output;
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}
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/**
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* Writes a cache file.
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*
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* @param string $file Filename
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* @param string $content Temporary file content
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*
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* @throws \RuntimeException when a cache file cannot be written
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*/
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private static function writeCacheFile($file, $content)
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{
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$tmpFile = tempnam(dirname($file), basename($file));
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if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
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@chmod($file, 0666 & ~umask());
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return;
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}
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throw new \RuntimeException(sprintf('Failed to write cache file "%s".', $file));
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}
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/**
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* Removes comments from a PHP source string.
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*
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* We don't use the PHP php_strip_whitespace() function
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* as we want the content to be readable and well-formatted.
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*
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* @param string $source A PHP string
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*
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* @return string The PHP string with the comments removed
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*/
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private static function stripComments($source)
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{
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if (!function_exists('token_get_all')) {
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return $source;
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}
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$output = '';
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foreach (token_get_all($source) as $token) {
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if (is_string($token)) {
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$output .= $token;
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} elseif (!in_array($token[0], array(T_COMMENT, T_DOC_COMMENT))) {
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$output .= $token[1];
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}
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}
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// replace multiple new lines with a single newline
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$output = preg_replace(array('/\s+$/Sm', '/\n+/S'), "\n", $output);
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return $output;
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}
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/**
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* Gets an ordered array of passed classes including all their dependencies.
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*
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* @param array $classes
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*
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* @return array An array of sorted \ReflectionClass instances (dependencies added if needed)
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*
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* @throws \InvalidArgumentException When a class can't be loaded
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*/
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private static function getOrderedClasses(array $classes)
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{
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$map = array();
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self::$seen = array();
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foreach ($classes as $class) {
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try {
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$reflectionClass = new \ReflectionClass($class);
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} catch (\ReflectionException $e) {
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throw new \InvalidArgumentException(sprintf('Unable to load class "%s"', $class));
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}
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$map = array_merge($map, self::getClassHierarchy($reflectionClass));
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}
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return $map;
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}
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private static function getClassHierarchy(\ReflectionClass $class)
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{
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if (isset(self::$seen[$class->getName()])) {
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return array();
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}
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self::$seen[$class->getName()] = true;
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$classes = array($class);
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$parent = $class;
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while (($parent = $parent->getParentClass()) && $parent->isUserDefined() && !isset(self::$seen[$parent->getName()])) {
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self::$seen[$parent->getName()] = true;
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array_unshift($classes, $parent);
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}
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if (function_exists('get_declared_traits')) {
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foreach ($classes as $c) {
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foreach (self::getTraits($c) as $trait) {
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self::$seen[$trait->getName()] = true;
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array_unshift($classes, $trait);
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}
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}
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}
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return array_merge(self::getInterfaces($class), $classes);
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}
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private static function getInterfaces(\ReflectionClass $class)
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{
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$classes = array();
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foreach ($class->getInterfaces() as $interface) {
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$classes = array_merge($classes, self::getInterfaces($interface));
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}
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if ($class->isUserDefined() && $class->isInterface() && !isset(self::$seen[$class->getName()])) {
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self::$seen[$class->getName()] = true;
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$classes[] = $class;
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}
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return $classes;
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}
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private static function getTraits(\ReflectionClass $class)
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{
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$traits = $class->getTraits();
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$classes = array();
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while ($trait = array_pop($traits)) {
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if ($trait->isUserDefined() && !isset(self::$seen[$trait->getName()])) {
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$classes[] = $trait;
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$traits = array_merge($traits, $trait->getTraits());
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}
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}
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return $classes;
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}
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}
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