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<?php |
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declare(strict_types=1); |
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namespace Benrowe\Fqcn; |
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use Composer\Autoload\ClassLoader; |
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/** |
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* Class Resolver |
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* |
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* @package Benrowe\Fqcn |
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*/ |
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class Resolver |
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{ |
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/** |
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* @var ClassLoader |
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*/ |
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private $composer; |
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/** |
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* @var array |
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*/ |
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private $extensions = ['.php']; |
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/** |
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* Resolver constructor. |
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* |
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* @param ClassLoader $composer |
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* @param array $extensions |
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*/ |
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public function __construct(ClassLoader $composer, $extensions = null) |
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{ |
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$this->composer = $composer; |
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} |
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/** |
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* Resolve a psr4 based namespace to an absolute directory |
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* |
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* @param string $namespace |
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* @return array |
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* @throws Exception |
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*/ |
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public function resolveDirectory(string $namespace): array |
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{ |
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$namespace = $this->normalise($namespace); |
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$prefixes = $this->composer->getPrefixesPsr4(); |
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$prefix = $this->findPrefix($namespace, array_keys($prefixes)); |
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if (!$prefix) { |
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throw new Exception('Could not find registered psr4 prefix that matches '.$namespace); |
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} |
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$discovered = []; |
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foreach ($prefixes[$prefix] as $path) { |
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$path = $this->findAbsolutePathForPsr4($namespace, $prefix, $path); |
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// convert the rest of the relative path, from the prefix into a directory slug |
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if ($path && is_dir($path)) { |
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$discovered[] = $path; |
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} |
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} |
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return $discovered; |
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} |
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/** |
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* @param string $namespace |
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* @param array $prefixes |
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* @return string |
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*/ |
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private function findPrefix(string $namespace, array $prefixes): string |
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{ |
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$prefixResult = ''; |
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// find the best matching prefix! |
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foreach ($prefixes as $prefix) { |
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if (substr($namespace, 0, strlen($prefix)) == $prefix && |
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strlen($prefix) > strlen($prefixResult) |
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) { |
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$prefixResult = $prefix; |
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} |
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} |
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return $prefixResult; |
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} |
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/** |
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* Convert the supplied namespace string into a standard format |
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* |
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* Example: |
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* Psr4\Prefix\ |
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* Something\ |
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* |
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* @param string $namespace |
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* @return string |
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* @throws Exception |
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*/ |
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private function normalise(string $namespace): string |
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{ |
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$tidy = trim($namespace, '\\'); |
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if (!$tidy) { |
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throw new Exception('Invalid namespace', 100); |
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} |
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return $tidy . '\\'; |
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} |
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/** |
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* Get an absolute path for the provided namespace, based on a existing directory and its psr4 prefix |
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* |
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* @param string $namespace |
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* @param string $psr4Prefix the psr4 prefix |
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* @param string $psr4Path and it's related path |
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* @return string the absolute directory path the provided namespace, given the correct prefix and path |
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* empty string if path cant be resolved |
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*/ |
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private function findAbsolutePathForPsr4(string $namespace, string $psr4Prefix, string $psr4Path): string |
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{ |
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$relFqn = trim(substr($namespace, strlen($psr4Prefix)), '\\/'); |
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$path = |
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$psr4Path . |
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DIRECTORY_SEPARATOR . |
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strtr($relFqn, [ |
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'\\' => DIRECTORY_SEPARATOR, |
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'//' => DIRECTORY_SEPARATOR |
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]); |
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$path = realpath($path); |
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return $path ?: ''; |
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} |
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} |
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benrowe /
fqcn
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.