class ClassMapGenerator

class ClassMapGenerator {
    
    /**
     * Generate a class map file
     *
     * @param \Traversable<string>|array<string> $dirs Directories or a single path to search in
     * @param string                             $file The name of the class map file
     */
    public static function dump(iterable $dirs, string $file) : void {
        $maps = [];
        foreach ($dirs as $dir) {
            $maps = array_merge($maps, static::createMap($dir));
        }
        file_put_contents($file, sprintf('<?php return %s;', var_export($maps, true)));
    }
    
    /**
     * Iterate over all files in the given directory searching for classes
     *
     * @param \Traversable<\SplFileInfo>|string|array<\SplFileInfo> $path The path to search in or an iterator
     * @param non-empty-string|null                                 $excluded     Regex that matches file paths to be excluded from the classmap
     * @param ?IOInterface                                          $io           IO object
     * @param null|string                                           $namespace    Optional namespace prefix to filter by
     * @param null|'psr-0'|'psr-4'|'classmap'                       $autoloadType psr-0|psr-4 Optional autoload standard to use mapping rules
     * @param array<non-empty-string, true>                         $scannedFiles
     * @return array<class-string, non-empty-string> A class map array
     * @throws \RuntimeException When the path is neither an existing file nor directory
     */
    public static function createMap($path, ?string $excluded = null, ?IOInterface $io = null, ?string $namespace = null, ?string $autoloadType = null, array &$scannedFiles = []) : array {
        $generator = new \Composer\ClassMapGenerator\ClassMapGenerator([
            'php',
            'inc',
            'hh',
        ]);
        $fileList = new FileList();
        $fileList->files = $scannedFiles;
        $generator->avoidDuplicateScans($fileList);
        $generator->scanPaths($path, $excluded, $autoloadType ?? 'classmap', $namespace);
        $classMap = $generator->getClassMap();
        $scannedFiles = $fileList->files;
        if ($io !== null) {
            foreach ($classMap->getPsrViolations() as $msg) {
                $io->writeError("<warning>{$msg}</warning>");
            }
            foreach ($classMap->getAmbiguousClasses() as $class => $paths) {
                if (count($paths) > 1) {
                    $io->writeError('<warning>Warning: Ambiguous class resolution, "' . $class . '"' . ' was found ' . (count($paths) + 1) . 'x: in "' . $classMap->getClassPath($class) . '" and "' . implode('", "', $paths) . '", the first will be used.</warning>');
                }
                else {
                    $io->writeError('<warning>Warning: Ambiguous class resolution, "' . $class . '"' . ' was found in both "' . $classMap->getClassPath($class) . '" and "' . implode('", "', $paths) . '", the first will be used.</warning>');
                }
            }
        }
        return $classMap->getMap();
    }

}