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<?php
/**
* Neve Autoloader
*
* Author: Andrei Baicus <andrei@themeisle.com>
* Created on: 17/08/2018
*
* @package Neve
*/
namespace Neve;
/**
* Class Autoloader
*
* @package Neve
*/
class Autoloader {
/**
* An associative array where the key is a namespace prefix and the value
* is an array of base directories for classes in that namespace.
*
* @var array
*/
protected $prefixes = array();
/**
* Register loader with SPL autoloader stack.
*
* @return void
*/
public function register() {
spl_autoload_register( array( $this, 'load_class' ) );
}
/**
* Adds a base directory for a namespace prefix.
*
* @param string $prefix The namespace prefix.
* @param string $base_dir A base directory for class files in the
* namespace.
* @param bool $prepend If true, prepend the base directory to the stack
* instead of appending it; this causes it to be searched first rather
* than last.
*
* @return void
*/
public function add_namespace( $prefix, $base_dir, $prepend = false ) {
// normalize namespace prefix
$prefix = trim( $prefix, '\\' ) . '\\';
// normalize the base directory with a trailing separator
$base_dir = rtrim( $base_dir, DIRECTORY_SEPARATOR ) . '/';
// initialize the namespace prefix array
if ( isset( $this->prefixes[ $prefix ] ) === false ) {
$this->prefixes[ $prefix ] = array();
}
// retain the base directory for the namespace prefix
if ( $prepend ) {
array_unshift( $this->prefixes[ $prefix ], $base_dir );
} else {
array_push( $this->prefixes[ $prefix ], $base_dir );
}
}
/**
* Loads the class file for a given class name.
*
* @param string $class The fully-qualified class name.
*
* @return mixed The mapped file name on success, or boolean false on
* failure.
*/
public function load_class( $class ) {
// the current namespace prefix
$prefix = $class;
// work backwards through the namespace names of the fully-qualified
// class name to find a mapped file name
while ( false !== strrpos( $prefix, '\\' ) ) {
$pos = strrpos( $prefix, '\\' );
// retain the trailing namespace separator in the prefix
$prefix = substr( $class, 0, $pos + 1 );
// the rest is the relative class name
$relative_class = substr( $class, $pos + 1 );
// try to load a mapped file for the prefix and relative class
$mapped_file = $this->load_mapped_file( $prefix, $relative_class );
if ( $mapped_file ) {
return $mapped_file;
}
// remove the trailing namespace separator for the next iteration
// of strrpos()
$prefix = rtrim( $prefix, '\\' );
}
// never found a mapped file
return false;
}
/**
* Load the mapped file for a namespace prefix and relative class.
*
* @param string $prefix The namespace prefix.
* @param string $relative_class The relative class name.
*
* @return mixed Boolean false if no mapped file can be loaded, or the
* name of the mapped file that was loaded.
*/
protected function load_mapped_file( $prefix, $relative_class ) {
// are there any base directories for this namespace prefix?
if ( isset( $this->prefixes[ $prefix ] ) === false ) {
return false;
}
// look through base directories for this namespace prefix
foreach ( $this->prefixes[ $prefix ] as $base_dir ) {
// replace the namespace prefix with the base directory,
// replace namespace separators with directory separators
// in the relative class name, append with .php
$relative_class = strtolower( str_replace( '\\', '/', $relative_class ) );
$file = $base_dir . $relative_class . '.php';
// if the mapped file exists, require it
if ( $this->require_file( $file ) ) {
// yes, we're done
return $file;
}
}
// never found it
return false;
}
/**
* If a file exists, require it from the file system.
*
* @param string $file The file to require.
*
* @return bool True if the file exists, false if not.
*/
protected function require_file( $file ) {
require $file;
return true;
}
}
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