Uri? toPackageUri()

in lib/src/package_config_impl.dart [158:178]

• 19 lines of code
• 6 McCabe index (conditional complexity)

  Uri? toPackageUri(Uri nonPackageUri) {
    if (nonPackageUri.isScheme('package')) {
      throw PackageConfigArgumentError(
          nonPackageUri, 'nonPackageUri', 'Must not be a package URI');
    }
    if (nonPackageUri.hasQuery || nonPackageUri.hasFragment) {
      throw PackageConfigArgumentError(nonPackageUri, 'nonPackageUri',
          'Must not have query or fragment part');
    }
    // Find package that file belongs to.
    var package = _packageTree.packageOf(nonPackageUri);
    if (package == null) return null;
    // Check if it is inside the package URI root.
    var path = nonPackageUri.toString();
    var root = package.packageUriRoot.toString();
    if (_beginsWith(package.root.toString().length, root, path)) {
      var rest = path.substring(root.length);
      return Uri(scheme: 'package', path: '${package.name}/$rest');
    }
    return null;
  }