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<?php namespace Box\Spout\Autoloader; /** * Class Psr4Autoloader * @see https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md#class-example */ class Psr4Autoloader { /** * An associative array where the key is a namespace prefix and the value * is an array of base directories for classes in that namespace. * * @var array */ protected $prefixes = []; /** * Register loader with SPL autoloader stack. * * @return void */ public function register() {< spl_autoload_register([$this, 'loadClass']);> \spl_autoload_register([$this, 'loadClass']);} /** * Adds a base directory for a namespace prefix. * * @param string $prefix The namespace prefix. * @param string $baseDir A base directory for class files in the * namespace. * @param bool $prepend If true, prepend the base directory to the stack * instead of appending it; this causes it to be searched first rather * than last. * @return void */ public function addNamespace($prefix, $baseDir, $prepend = false) { // normalize namespace prefix< $prefix = trim($prefix, '\\') . '\\';> $prefix = \trim($prefix, '\\') . '\\';// normalize the base directory with a trailing separator< $baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR) . '/';> $baseDir = \rtrim($baseDir, DIRECTORY_SEPARATOR) . '/';// initialize the namespace prefix array if (isset($this->prefixes[$prefix]) === false) { $this->prefixes[$prefix] = []; } // retain the base directory for the namespace prefix if ($prepend) {< array_unshift($this->prefixes[$prefix], $baseDir);> \array_unshift($this->prefixes[$prefix], $baseDir);} else {< array_push($this->prefixes[$prefix], $baseDir);> \array_push($this->prefixes[$prefix], $baseDir);} } /** * Loads the class file for a given class name. * * @param string $class The fully-qualified class name. * @return mixed The mapped file name on success, or boolean false on * failure. */ public function loadClass($class) { // the current namespace prefix $prefix = $class; // work backwards through the namespace names of the fully-qualified // class name to find a mapped file name< while (($pos = strrpos($prefix, '\\')) !== false) {> while (($pos = \strrpos($prefix, '\\')) !== false) {// retain the trailing namespace separator in the prefix< $prefix = substr($class, 0, $pos + 1);> $prefix = \substr($class, 0, $pos + 1);// the rest is the relative class name< $relativeClass = substr($class, $pos + 1);> $relativeClass = \substr($class, $pos + 1);// try to load a mapped file for the prefix and relative class $mappedFile = $this->loadMappedFile($prefix, $relativeClass); if ($mappedFile !== false) { return $mappedFile; } // remove the trailing namespace separator for the next iteration // of strrpos()< $prefix = rtrim($prefix, '\\');> $prefix = \rtrim($prefix, '\\');} // never found a mapped file return false; } /** * Load the mapped file for a namespace prefix and relative class. * * @param string $prefix The namespace prefix. * @param string $relativeClass The relative class name. * @return mixed Boolean false if no mapped file can be loaded, or the * name of the mapped file that was loaded. */ protected function loadMappedFile($prefix, $relativeClass) { // are there any base directories for this namespace prefix? if (isset($this->prefixes[$prefix]) === false) { return false; } // look through base directories for this namespace prefix foreach ($this->prefixes[$prefix] as $baseDir) { // replace the namespace prefix with the base directory, // replace namespace separators with directory separators // in the relative class name, append with .php $file = $baseDir< . str_replace('\\', '/', $relativeClass)> . \str_replace('\\', '/', $relativeClass). '.php'; // if the mapped file exists, require it if ($this->requireFile($file)) { // yes, we're done return $file; } } // never found it return false; } /** * If a file exists, require it from the file system. * * @param string $file The file to require. * @return bool True if the file exists, false if not. */ protected function requireFile($file) {< if (file_exists($file)) {> if (\file_exists($file)) {require $file; return true; } return false; } }