100 lines
2.8 KiB
PHP
100 lines
2.8 KiB
PHP
<?php namespace Laravel;
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class Autoloader {
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/**
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* The PSR-0 compliant libraries registered with the auto-loader.
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*
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* @var array
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*/
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protected static $libraries = array();
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/**
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* The paths to be searched by the auto-loader.
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*
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* @var array
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*/
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protected static $paths = array(BASE_PATH, MODEL_PATH, LIBRARY_PATH);
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/**
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* Load the file corresponding to a given class.
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*
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* Laravel loads classes out of three directories: the core "laravel" directory,
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* and the application "models" and "libraries" directories. All of the file
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* names are lower cased and the directory structure corresponds with the
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* class namespaces.
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*
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* The application "libraries" directory also supports the inclusion of PSR-0
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* compliant libraries. These libraries will be detected automatically and
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* will be loaded according to the PSR-0 naming conventions.
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*
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* @param string $class
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* @return void
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*/
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public static function load($class)
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{
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if (array_key_exists($class, Config::$items['application']['aliases']))
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{
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return class_alias(Config::$items['application']['aliases'][$class], $class);
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}
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if ( ! is_null($path = static::find($class)))
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{
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require $path;
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}
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}
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/**
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* Determine the file path associated with a given class name.
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*
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* @param string $class
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* @return string
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*/
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protected static function find($class)
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{
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// After PHP namespaces were introduced, most libaries ditched underscores for
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// for namespaces to indicate the class directory hierarchy. We will chec for
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// the present of namespace slashes to determine the directory separator.
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if (strpos($class, '\\') !== false)
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{
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$library = substr($class, 0, strpos($class, '\\'));
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}
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else
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{
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$library = substr($class, 0, strpos($class, '_'));
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}
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$file = str_replace('\\', '/', $class);
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// If the namespace has been registered as a PSR-0 compliant library, we will
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// load the library according to the PSR-0 naming standards, which state that
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// namespaces and underscores indicate the directory hierarchy of the class.
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//
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// The PSR-0 standard is exactly like the typical Laravel standard, the only
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// difference being that Laravel files are all lowercase, while PSR-0 states
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// that the file name should match the class name.
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if (isset(static::$libraries[$library]))
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{
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return str_replace('_', '/', $file).EXT;
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}
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foreach (static::$paths as $path)
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{
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if (file_exists($path = $path.strtolower($file).EXT))
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{
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return $path;
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}
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}
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// If we could not find the class file in any of the auto-loaded locations
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// according to the Laravel naming standard, we will search the libraries
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// directory for the class according to the PSR-0 naming standard.
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if (file_exists($path = LIBRARY_PATH.str_replace('_', '/', $file).EXT))
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{
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static::$libraries[] = $library;
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return $path;
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}
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}
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} |