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MDL-53016 classloader: Load PSR-0 and PSR-4 namespaces dynamically

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This commit is contained in:
Dan Poltawski
2016-08-05 10:11:52 +08:00
committed by John Okely
parent 7752762674
commit 91c07d06af
1 changed files with 48 additions and 82 deletions
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lib/classes/component.php
+48 -82
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@@ -67,8 +67,10 @@ class core_component {
protected static $version = null;
/** @var array list of the files to map. */
protected static $filestomap = array('lib.php', 'settings.php');
/** @var array cache of PSR loadable systems */
protected static $psrclassmap = null;
/** @var array associative array of PRS-4 and PSR-0 namespaces and corresponding paths. */
protected static $psrnamespaces = array(
'Horde' => 'lib/horde/framework/Horde',
);
/**
* Class loader for Frankenstyle named classes in standard locations.
@@ -107,15 +109,54 @@ class core_component {
return;
}
// Attempt to normalize the classname.
$normalizedclassname = str_replace(array('/', '\\'), '_', $classname);
if (isset(self::$psrclassmap[$normalizedclassname])) {
// Function include would be faster, but for BC it is better to include only once.
include_once(self::$psrclassmap[$normalizedclassname]);
if (self::psr_classloader($classname)) {
return;
}
}
/**
* Load a class from our defined PSR-0 or PSR-4 standard namespaces on
* demand.
*
* Adapated from http://www.php-fig.org/psr/psr-4/examples/ and made PSR-0
* compatible.
*
* @param string $class the name fo the class.
* @return bool true if class was loaded.
*/
protected static function psr_classloader($class) {
global $CFG;
// Iterate through each namespace prefix.
foreach (self::$psrnamespaces as $prefix => $path) {
// Does the class use the namespace prefix?
$len = strlen($prefix);
if (strncmp($prefix, $class, $len) !== 0) {
// No, move to the next prefix.
continue;
}
$path = $CFG->dirroot . DIRECTORY_SEPARATOR . $path;
// Get the relative class name.
$relativeclass = substr($class, $len);
// Replace the namespace prefix with the base directory, replace namespace
// separators or _ with directory separators in the relative class name, append
// with .php.
$file = $path. str_replace(array('\\', '_'), DIRECTORY_SEPARATOR, $relativeclass) . '.php';
// If the file exists, require it.
if (file_exists($file)) {
require($file);
return true;
}
}
return false;
}
/**
* Initialise caches, always call before accessing self:: caches.
*/
@@ -155,7 +196,6 @@ class core_component {
self::$classmap = $cache['classmap'];
self::$classmaprenames = $cache['classmaprenames'];
self::$filemap = $cache['filemap'];
self::$psrclassmap = $cache['psrclassmap'];
return;
}
@@ -196,7 +236,6 @@ class core_component {
self::$classmap = $cache['classmap'];
self::$classmaprenames = $cache['classmaprenames'];
self::$filemap = $cache['filemap'];
self::$psrclassmap = $cache['psrclassmap'];
return;
}
// Note: we do not verify $CFG->admin here intentionally,
@@ -284,7 +323,6 @@ class core_component {
'classmaprenames' => self::$classmaprenames,
'filemap' => self::$filemap,
'version' => self::$version,
'psrclassmap' => self::$psrclassmap,
);
return '<?php
@@ -308,7 +346,6 @@ $cache = '.var_export($cache, true).';
self::fill_classmap_cache();
self::fill_classmap_renames_cache();
self::fill_filemap_cache();
self::fill_psr_cache();
self::fetch_core_version();
}
@@ -692,77 +729,6 @@ $cache = '.var_export($cache, true).';
unset($items);
}
/**
* Fill caches for classes following the PSR-0 standard for the
* specified Vendors.
*
* PSR Autoloading is detailed at http://www.php-fig.org/psr/psr-0/.
*/
protected static function fill_psr_cache() {
global $CFG;
$psrsystems = array(
'Horde' => 'horde/framework',
);
self::$psrclassmap = array();
foreach ($psrsystems as $system => $fulldir) {
if (!$fulldir) {
continue;
}
self::load_psr_classes($CFG->libdir . DIRECTORY_SEPARATOR . $fulldir);
}
}
/**
* Find all PSR-0 style classes in within the base directory.
*
* @param string $basedir The base directory that the PSR-type library can be found in.
* @param string $subdir The directory within the basedir to search for classes within.
*/
protected static function load_psr_classes($basedir, $subdir = null) {
if ($subdir) {
$fulldir = realpath($basedir . DIRECTORY_SEPARATOR . $subdir);
$classnameprefix = preg_replace('#' . preg_quote(DIRECTORY_SEPARATOR) . '#', '_', $subdir);
} else {
$fulldir = $basedir;
}
if (!$fulldir || !is_dir($fulldir)) {
return;
}
$items = new \DirectoryIterator($fulldir);
foreach ($items as $item) {
if ($item->isDot()) {
continue;
}
if ($item->isDir()) {
$dirname = $item->getFilename();
$newsubdir = $dirname;
if ($subdir) {
$newsubdir = implode(DIRECTORY_SEPARATOR, array($subdir, $dirname));
}
self::load_psr_classes($basedir, $newsubdir);
continue;
}
$filename = $item->getFilename();
$classname = preg_replace('/\.php$/', '', $filename);
if ($filename === $classname) {
// Not a php file.
continue;
}
if ($classnameprefix) {
$classname = $classnameprefix . '_' . $classname;
}
self::$psrclassmap[$classname] = $fulldir . DIRECTORY_SEPARATOR . $filename;
}
unset($item);
unset($items);
}
/**
* List all core subsystems and their location