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<?php |
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/** |
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* Autoloader |
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* |
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* Load namespaces and classes following the WordPress naming convertions. |
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* https://make.wordpress.org/core/handbook/best-practices/coding-standards/php/#naming-conventions |
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*/ |
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namespace ClaudioSanches\WPAutoloader; |
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/** |
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* Autoloader. |
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*/ |
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class Autoloader |
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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 $prefixes = []; |
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/** |
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* Register loader with SPL autoloader stack. |
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*/ |
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public function register() |
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{ |
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spl_autoload_register([$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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*/ |
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public function addNamespace(string $prefix, string $baseDir) |
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{ |
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$prefix = trim($prefix, '\\') . '\\'; |
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$baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR; |
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if (false === isset($this->prefixes[$prefix])) { |
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$this->prefixes[$prefix] = []; |
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} |
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array_push($this->prefixes[$prefix], $baseDir); |
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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 $class The fully-qualified class name. |
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* @return string The mapped file name on success, or emtpy string on |
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* failure. |
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*/ |
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public function loadClass($class): string |
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{ |
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$prefix = $class; |
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while (false !== ($position = strrpos($prefix, '\\'))) { |
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$prefix = substr($class, 0, $position + 1); |
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$relativeClass = substr($class, $position + 1); |
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if ($mappedFile = $this->loadMappedFile($prefix, $relativeClass)) { |
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return $mappedFile; |
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} |
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// Remove the trailing namespace separator for the next iteration. |
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$prefix = rtrim($prefix, '\\'); |
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} |
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return ''; |
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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 $relativeClass The relative class name. |
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* |
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* @return string Empty string if no mapped file can be |
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* loaded, or the name of the mapped file that was loaded. |
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*/ |
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protected function loadMappedFile($prefix, $relativeClass) |
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{ |
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if (false === isset($this->prefixes[$prefix])) { |
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return ''; |
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} |
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$relativeFile = $this->getRelativeFile($relativeClass); |
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// Look through base directories for this namespace prefix. |
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foreach ($this->prefixes[$prefix] as $baseDir) { |
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$file = $baseDir . $relativeFile; |
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// If the mapped file exists, require it. |
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if ($this->requireFile($file)) { |
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return $file; |
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} |
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} |
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return ''; |
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} |
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/** |
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* Normalize path using WordPress naming convertions. |
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* |
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* @param string $path Relative class path. |
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* @return string |
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*/ |
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protected function normalizePath(string $path): string |
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{ |
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return str_replace('_', '-', strtolower($path)); |
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} |
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/** |
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* Get relative file path. |
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* |
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* @param string $relativeClass Relative class. |
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* @return string |
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*/ |
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protected function getRelativeFile(string $relativeClass): string |
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{ |
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// Class file names should be based on the class name with |
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// "class-" prepended and the underscores in the class name |
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// replaced with hyphens. |
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$relative = $this->normalizePath($relativeClass); |
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$pieces = explode('\\', $relative); |
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$last = array_pop($pieces); |
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$last = 'class-' . $last . '.php'; |
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$pieces[] = $last; |
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return implode(DIRECTORY_SEPARATOR, $pieces); |
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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(string $file): bool |
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{ |
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if (file_exists($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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claudiosanches /
wp-autoloader
