Add cache

src/class-cache.php

@@ -0,0 +1,152 @@
+<?php
+/**
+ * Cache for autoload.
+ *
+ * @package   wppunk/wpautoload
+ * @author    WPPunk
+ * @link      https://github.com/wppunk/wpautoload/
+ * @copyright Copyright (c) 2020
+ * @license   GPL-2.0+
+ */
+
+namespace WPPunk\Autoload;
+
+/**
+ * @codeCoverageIgnore
+ */
+if ( class_exists( '\WPPunk\Autoload\Cache' ) ) {
+	return;
+}
+/**
+ * @codingStandardsIgnoreEnd
+ */
+
+/**
+ * Class Cache
+ *
+ * @package wppunk/wpautoload
+ */
+class Cache {
+
+	/**
+	 * Classmap file
+	 *
+	 * @var string
+	 */
+	private $map_file;
+	/**
+	 * Classmap
+	 *
+	 * @var array
+	 */
+	private $map;
+	/**
+	 * Has the cache been updated
+	 *
+	 * @var bool
+	 */
+	private $has_been_update = false;
+
+	/**
+	 * Cache constructor.
+	 */
+	public function __construct() {
+		$this->map_file = __DIR__ . '/../cache/classmap.php';
+		if ( file_exists( $this->map_file ) ) {
+			include $this->map_file;
+		}
+		$this->map = is_array( $this->map ) ? $this->map : [];
+		register_shutdown_function( [ $this, 'save' ] );
+	}
+
+	/**
+	 * Get path for class
+	 *
+	 * @param string $class Class name.
+	 *
+	 * @return string
+	 */
+	public function get( $class ) {
+		return isset( $this->map[ $class ] ) ? $this->map[ $class ] : '';
+	}
+
+	/**
+	 * Update cache
+	 *
+	 * @param string $class Class name.
+	 * @param string $path  Path to file.
+	 */
+	public function update( $class, $path ) {
+		$this->has_been_update = true;
+		$this->map[ $class ]   = $path;
+	}
+
+	/**
+	 * Save cache
+	 */
+	public function save() {
+		if ( ! $this->has_been_update ) {
+			return;
+		}
+
+		$this->create_dir();
+
+		// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_file_put_contents
+		file_put_contents( $this->map_file, '<?php return [' . $this->create_map() . '];', LOCK_EX );
+	}
+
+	/**
+	 * Create cache directory.
+	 */
+	private function create_dir() {
+		if ( ! file_exists( dirname( $this->map_file ) ) ) {
+			mkdir( dirname( $this->map_file ), 0755, true );
+		}
+	}
+
+	/**
+	 * Create class map.
+	 *
+	 * @return string
+	 */
+	private function create_map() {
+		$map  = '';
+		$last = end( $this->map );
+		foreach ( $this->map as $key => $value ) {
+			$map .= "'$key' => '$value'";
+			if ( $value !== $last ) {
+				$map .= ",\n";
+			}
+		}
+
+		return $map;
+	}
+
+	/**
+	 * Clear garbage classes
+	 */
+	public function clear_garbage() {
+		foreach ( $this->map as $key => $file ) {
+			$this->clear_class( $key, $file );
+		}
+	}
+
+	/**
+	 * Clear class
+	 *
+	 * @param string $class_name Class name.
+	 * @param string $path       Path to file.
+	 */
+	private function clear_class( $class_name, $path ) {
+		$path = realpath( $path );
+		if ( ! file_exists( $path ) ) {
+			$this->has_been_update = true;
+			unset( $this->map[ $class_name ] );
+
+			return;
+		}
+
+		$this->map[ $class_name ] = $path;
+	}
+
+}