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Merge pull request #469 from Antidot-be/Issue-468
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Provide a ClassLoader enabled to use PSR-4 loading (close #468)
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@kcppdevelopers
kcppdevelopers committed May 26, 2016
2 parents 02d5de7 + 6d7f5da commit 85dec33
Showing 1 changed file with 212 additions and 45 deletions.
257 changes: 212 additions & 45 deletions classes/lib/composer/ClassLoader.php
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Original file line number Diff line number Diff line change
Expand Up @@ -13,9 +13,7 @@
namespace Composer\Autoload;

/**
* ClassLoader implements a PSR-0 class loader
*
* See https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
* ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
*
* $loader = new \Composer\Autoload\ClassLoader();
*
Expand All @@ -39,22 +37,47 @@
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Jordi Boggiano <j.boggiano@seld.be>
* @see http://www.php-fig.org/psr/psr-0/
* @see http://www.php-fig.org/psr/psr-4/
*/
class ClassLoader
{
private $prefixes = array();
private $fallbackDirs = array();
// PSR-4
private $prefixLengthsPsr4 = array();
private $prefixDirsPsr4 = array();
private $fallbackDirsPsr4 = array();

// PSR-0
private $prefixesPsr0 = array();
private $fallbackDirsPsr0 = array();

private $useIncludePath = false;
private $classMap = array();

private $classMapAuthoritative = false;

public function getPrefixes()
{
return call_user_func_array('array_merge', $this->prefixes);
if (!empty($this->prefixesPsr0)) {
return call_user_func_array('array_merge', $this->prefixesPsr0);
}

return array();
}

public function getPrefixesPsr4()
{
return $this->prefixDirsPsr4;
}

public function getFallbackDirs()
{
return $this->fallbackDirs;
return $this->fallbackDirsPsr0;
}

public function getFallbackDirsPsr4()
{
return $this->fallbackDirsPsr4;
}

public function getClassMap()
Expand All @@ -75,23 +98,24 @@ public function addClassMap(array $classMap)
}

/**
* Registers a set of classes, merging with any others previously set.
* Registers a set of PSR-0 directories for a given prefix, either
* appending or prepending to the ones previously set for this prefix.
*
* @param string $prefix The classes prefix
* @param array|string $paths The location(s) of the classes
* @param bool $prepend Prepend the location(s)
* @param string $prefix The prefix
* @param array|string $paths The PSR-0 root directories
* @param bool $prepend Whether to prepend the directories
*/
public function add($prefix, $paths, $prepend = false)
{
if (!$prefix) {
if ($prepend) {
$this->fallbackDirs = array_merge(
$this->fallbackDirsPsr0 = array_merge(
(array) $paths,
$this->fallbackDirs
$this->fallbackDirsPsr0
);
} else {
$this->fallbackDirs = array_merge(
$this->fallbackDirs,
$this->fallbackDirsPsr0 = array_merge(
$this->fallbackDirsPsr0,
(array) $paths
);
}
Expand All @@ -100,38 +124,109 @@ public function add($prefix, $paths, $prepend = false)
}

$first = $prefix[0];
if (!isset($this->prefixes[$first][$prefix])) {
$this->prefixes[$first][$prefix] = (array) $paths;
if (!isset($this->prefixesPsr0[$first][$prefix])) {
$this->prefixesPsr0[$first][$prefix] = (array) $paths;

return;
}
if ($prepend) {
$this->prefixes[$first][$prefix] = array_merge(
$this->prefixesPsr0[$first][$prefix] = array_merge(
(array) $paths,
$this->prefixes[$first][$prefix]
$this->prefixesPsr0[$first][$prefix]
);
} else {
$this->prefixes[$first][$prefix] = array_merge(
$this->prefixes[$first][$prefix],
$this->prefixesPsr0[$first][$prefix] = array_merge(
$this->prefixesPsr0[$first][$prefix],
(array) $paths
);
}
}

/**
* Registers a set of classes, replacing any others previously set.
* Registers a set of PSR-4 directories for a given namespace, either
* appending or prepending to the ones previously set for this namespace.
*
* @param string $prefix The classes prefix
* @param array|string $paths The location(s) of the classes
* @param string $prefix The prefix/namespace, with trailing '\\'
* @param array|string $paths The PSR-4 base directories
* @param bool $prepend Whether to prepend the directories
*
* @throws \InvalidArgumentException
*/
public function addPsr4($prefix, $paths, $prepend = false)
{
if (!$prefix) {
// Register directories for the root namespace.
if ($prepend) {
$this->fallbackDirsPsr4 = array_merge(
(array) $paths,
$this->fallbackDirsPsr4
);
} else {
$this->fallbackDirsPsr4 = array_merge(
$this->fallbackDirsPsr4,
(array) $paths
);
}
} elseif (!isset($this->prefixDirsPsr4[$prefix])) {
// Register directories for a new namespace.
$length = strlen($prefix);
if ('\\' !== $prefix[$length - 1]) {
throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
}
$this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
$this->prefixDirsPsr4[$prefix] = (array) $paths;
} elseif ($prepend) {
// Prepend directories for an already registered namespace.
$this->prefixDirsPsr4[$prefix] = array_merge(
(array) $paths,
$this->prefixDirsPsr4[$prefix]
);
} else {
// Append directories for an already registered namespace.
$this->prefixDirsPsr4[$prefix] = array_merge(
$this->prefixDirsPsr4[$prefix],
(array) $paths
);
}
}

/**
* Registers a set of PSR-0 directories for a given prefix,
* replacing any others previously set for this prefix.
*
* @param string $prefix The prefix
* @param array|string $paths The PSR-0 base directories
*/
public function set($prefix, $paths)
{
if (!$prefix) {
$this->fallbackDirs = (array) $paths;
$this->fallbackDirsPsr0 = (array) $paths;
} else {
$this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths;
}
}

return;
/**
* Registers a set of PSR-4 directories for a given namespace,
* replacing any others previously set for this namespace.
*
* @param string $prefix The prefix/namespace, with trailing '\\'
* @param array|string $paths The PSR-4 base directories
*
* @throws \InvalidArgumentException
*/
public function setPsr4($prefix, $paths)
{
if (!$prefix) {
$this->fallbackDirsPsr4 = (array) $paths;
} else {
$length = strlen($prefix);
if ('\\' !== $prefix[$length - 1]) {
throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
}
$this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
$this->prefixDirsPsr4[$prefix] = (array) $paths;
}
$this->prefixes[substr($prefix, 0, 1)][$prefix] = (array) $paths;
}

/**
Expand All @@ -155,6 +250,27 @@ public function getUseIncludePath()
return $this->useIncludePath;
}

/**
* Turns off searching the prefix and fallback directories for classes
* that have not been registered with the class map.
*
* @param bool $classMapAuthoritative
*/
public function setClassMapAuthoritative($classMapAuthoritative)
{
$this->classMapAuthoritative = $classMapAuthoritative;
}

/**
* Should class lookup fail if not found in the current class map?
*
* @return bool
*/
public function isClassMapAuthoritative()
{
return $this->classMapAuthoritative;
}

/**
* Registers this instance as an autoloader.
*
Expand Down Expand Up @@ -182,7 +298,7 @@ public function unregister()
public function loadClass($class)
{
if ($file = $this->findFile($class)) {
include $file;
includeFile($file);

return true;
}
Expand All @@ -202,45 +318,96 @@ public function findFile($class)
$class = substr($class, 1);
}

// class map lookup
if (isset($this->classMap[$class])) {
return $this->classMap[$class];
}
if ($this->classMapAuthoritative) {
return false;
}

$file = $this->findFileWithExtension($class, '.php');

// Search for Hack files if we are running on HHVM
if ($file === null && defined('HHVM_VERSION')) {
$file = $this->findFileWithExtension($class, '.hh');
}

if ($file === null) {
// Remember that this class does not exist.
return $this->classMap[$class] = false;
}

return $file;
}

private function findFileWithExtension($class, $ext)
{
// PSR-4 lookup
$logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;

$first = $class[0];
if (isset($this->prefixLengthsPsr4[$first])) {
foreach ($this->prefixLengthsPsr4[$first] as $prefix => $length) {
if (0 === strpos($class, $prefix)) {
foreach ($this->prefixDirsPsr4[$prefix] as $dir) {
if (file_exists($file = $dir . DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $length))) {
return $file;
}
}
}
}
}

// PSR-4 fallback dirs
foreach ($this->fallbackDirsPsr4 as $dir) {
if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
return $file;
}
}

// PSR-0 lookup
if (false !== $pos = strrpos($class, '\\')) {
// namespaced class name
$classPath = strtr(substr($class, 0, $pos), '\\', DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
$className = substr($class, $pos + 1);
$logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
. strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
} else {
// PEAR-like class name
$classPath = null;
$className = $class;
$logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
}

$classPath .= strtr($className, '_', DIRECTORY_SEPARATOR) . '.php';

$first = $class[0];
if (isset($this->prefixes[$first])) {
foreach ($this->prefixes[$first] as $prefix => $dirs) {
if (isset($this->prefixesPsr0[$first])) {
foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
if (0 === strpos($class, $prefix)) {
foreach ($dirs as $dir) {
if (file_exists($dir . DIRECTORY_SEPARATOR . $classPath)) {
return $dir . DIRECTORY_SEPARATOR . $classPath;
if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
return $file;
}
}
}
}
}

foreach ($this->fallbackDirs as $dir) {
if (file_exists($dir . DIRECTORY_SEPARATOR . $classPath)) {
return $dir . DIRECTORY_SEPARATOR . $classPath;
// PSR-0 fallback dirs
foreach ($this->fallbackDirsPsr0 as $dir) {
if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
return $file;
}
}

if ($this->useIncludePath && $file = stream_resolve_include_path($classPath)) {
// PSR-0 include paths.
if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
return $file;
}

return $this->classMap[$class] = false;
}
}

/**
* Scope isolated include.
*
* Prevents access to $this/self from included files.
*/
function includeFile($file)
{
include $file;
}

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