152 lines
4.0 KiB
PHP
152 lines
4.0 KiB
PHP
<?php
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/**
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* Neve Autoloader
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*
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* Author: Andrei Baicus <andrei@themeisle.com>
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* Created on: 17/08/2018
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*
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* @package Neve
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*/
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namespace Neve;
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/**
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* Class Autoloader
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*
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* @package Neve
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*/
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class Autoloader {
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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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spl_autoload_register( array( $this, 'load_class' ) );
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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 $base_dir 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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*
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* @return void
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*/
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public function add_namespace( $prefix, $base_dir, $prepend = false ) {
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// normalize namespace prefix
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$prefix = trim( $prefix, '\\' ) . '\\';
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// normalize the base directory with a trailing separator
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$base_dir = rtrim( $base_dir, 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 ], $base_dir );
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} else {
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array_push( $this->prefixes[ $prefix ], $base_dir );
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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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*
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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 load_class( $class ) {
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// the current namespace prefix
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$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 !== strrpos( $prefix, '\\' ) ) {
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$pos = strrpos( $prefix, '\\' );
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// retain the trailing namespace separator in the prefix
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$prefix = substr( $class, 0, $pos + 1 );
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// the rest is the relative class name
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$relative_class = substr( $class, $pos + 1 );
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// try to load a mapped file for the prefix and relative class
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$mapped_file = $this->load_mapped_file( $prefix, $relative_class );
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if ( $mapped_file ) {
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return $mapped_file;
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}
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// remove the trailing namespace separator for the next iteration
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// of strrpos()
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$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 $relative_class The relative class name.
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*
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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 load_mapped_file( $prefix, $relative_class ) {
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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 $base_dir ) {
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// replace the namespace prefix with the base directory,
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// replace namespace separators with directory separators
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// in the relative class name, append with .php
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$relative_class = strtolower( str_replace( '\\', '/', $relative_class ) );
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$file = $base_dir . $relative_class . '.php';
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// if the mapped file exists, require it
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if ( $this->require_file( $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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*
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* @return bool True if the file exists, false if not.
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*/
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protected function require_file( $file ) {
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require $file;
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return true;
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}
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}
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