private static function findFile($class)
{
if (!empty(self::$map[$class])) {
// 类库映射
return self::$map[$class];
}
// 查找 PSR-4
$logicalPathPsr4 = strtr($class, '\\', DS) . EXT;
$first = $class[0];
if (isset(self::$prefixLengthsPsr4[$first])) {
foreach (self::$prefixLengthsPsr4[$first] as $prefix => $length) {
if (0 === strpos($class, $prefix)) {
foreach (self::$prefixDirsPsr4[$prefix] as $dir) {
if (is_file($file = $dir . DS . substr($logicalPathPsr4, $length))) {
return $file;
}
}
}
}
}
// 查找 PSR-4 fallback dirs
foreach (self::$fallbackDirsPsr4 as $dir) {
if (is_file($file = $dir . DS . $logicalPathPsr4)) {
return $file;
}
}
// 查找 PSR-0
if (false !== ($pos = strrpos($class, '\\'))) {
// namespaced class name
$logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1) . strtr(substr($logicalPathPsr4, $pos + 1), '_', DS);
} else {
// PEAR-like class name
$logicalPathPsr0 = strtr($class, '_', DS) . EXT;
}
if (isset(self::$prefixesPsr0[$first])) {
foreach (self::$prefixesPsr0[$first] as $prefix => $dirs) {
if (0 === strpos($class, $prefix)) {
foreach ($dirs as $dir) {
if (is_file($file = $dir . DS . $logicalPathPsr0)) {
return $file;
}
}
}
}
}
// 查找 PSR-0 fallback dirs
foreach (self::$fallbackDirsPsr0 as $dir) {
if (is_file($file = $dir . DS . $logicalPathPsr0)) {
return $file;
}
}
return self::$map[$class] = false;
}