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