ffwp-autoload.php

<?php
/* * * * * * * * * * * * * * * * * * * * * *
 * @author   : Daan van den Bergh
 * @url      : https://daan.dev/wordpress-plugins/
 * @copyright: © 2021 - 2024 Daan van den Bergh
 * @license  : GPL2v2 or later
 * * * * * * * * * * * * * * * * * * * * * */

class FFWP_Autoloader {

	/** @var string $class */
	private $class;

	/** @var string $file */
	private $file;

	/**
	 * FFWP_Autoloader constructor.
	 *
	 * @param $class
	 */
	public function __construct(
		$class
	) {
		$this->class = $class;
	}

	/**
	 * Build filepath for requested class.
	 */
	public function load() {
		$path       = explode( '_', $this->class );
		$this->file = '';
		$i          = 0;

		if ( count( $path ) > 1 ) {
			array_shift( $path );
		}
		end( $path );

		/**
		 * Build directory path.
		 */
		while ( $i < key( $path ) ) {
			$this->build( $path[ $i ], '', '/' );

			$i++;
		}

		/**
		 * Build filename.
		 */
		$this->build( $path[ $i ], 'class', '.php' );

		return $this->file;
	}

	/**
	 * Checks if $path is written uppercase entirely, otherwise it'll split $path up and build a string glued with
	 * dashes.
	 *
	 * @param        $path
	 * @param string $prefix
	 * @param string $suffix
	 */
	private function build( $path, $prefix = '', $suffix = '/' ) {
		if ( ctype_upper( $path ) ) {
			$this->file .= ( $prefix ? $prefix . '-' : '' ) . strtolower( $path ) . $suffix;
		} else {
			$parts       = preg_split( '/(?=[A-Z])/', lcfirst( $path ) );
			$this->file .= ( $prefix ? $prefix . '-' : '' ) . strtolower( implode( '-', $parts ) ) . $suffix;
		}
	}
}