findPath method

String? findPath(String basename, String module)

Implementation

String? findPath(String basename, String module) {
  if (isEmpty) return null;
  String filepath;
  if (module[0] == "/") {
    filepath = module;
  } else {
    filepath = path.join(basename, '..', module);
  }
  if (filepath[0] != "/") filepath = "/" + filepath;
  filepath = path.normalize(filepath);
  String ext = path.extension(filepath);

  if (ext.isEmpty) {
    for (var fileSystem in this) {
      if (fileSystem.mount != null) {
        String mountPath = "${fileSystem.mount!}/";
        if (filepath.startsWith(mountPath)) {
          filepath = filepath.replaceFirst(fileSystem.mount!, "");
        } else {
          continue;
        }
      }
      String? testFile(String filepath) {
        String newPath = "$filepath.js";
        if (fileSystem.exist(newPath)) return newPath;
        newPath = "$filepath.json";
        if (fileSystem.exist(newPath)) return newPath;
        newPath = "$filepath/package.json";
        if (fileSystem.exist(newPath)) {
          var code = fileSystem.read(newPath);
          var json = jsonDecode(code!);
          if (json is Map) {
            var main = json["main"];
            if (main != null) {
              return "$filepath/$main";
            }
          }
        }
        return null;
      }

      String? newPath = testFile(filepath);
      if (newPath != null)
        return newPath;

      String basename = path.dirname(filepath);
      while (true) {
        if (basename.isEmpty) break;
        String modulePath = path.join(basename, 'node_modules', module);
        var newPath = testFile(modulePath);
        if (newPath != null) return newPath;
        basename = path.dirname(basename);
      }

      print("$module is not found!");
    }
  } else {
    for (var fileSystem in this) {
      if (fileSystem.exist(filepath)) return filepath;
    }
  }
}