151 lines
4.5 KiB
PHP
151 lines
4.5 KiB
PHP
<?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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* @package Box\Spout\Autoloader
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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 $prefixes = array();
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/**
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* Register loader with SPL autoloader stack.
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*
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* @return void
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*/
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public function register()
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{
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spl_autoload_register(array($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[$prefix] = array();
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}
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// retain the base directory for the namespace prefix
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if ($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 (false !== $pos = strrpos($prefix, '\\')) {
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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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