Uri pathToUrl()

in source_gen/lib/src/library.dart [95:142]
37 lines of code
10 McCabe index (conditional complexity)

  Uri pathToUrl(dynamic toUrlOrString) {
    if (toUrlOrString == null) {
      throw ArgumentError.notNull('toUrlOrString');
    }
    final to = toUrlOrString is Uri
        ? toUrlOrString
        : Uri.parse(toUrlOrString as String);
    if (to.scheme == 'dart') {
      // Convert dart:core/map.dart to dart:core.
      return normalizeDartUrl(to);
    }
    if (to.scheme == 'package') {
      // Identity (no-op).
      return to;
    }
    if (to.scheme == 'asset') {
      // This is the same thing as a package: URL.
      //
      // i.e.
      //   asset:foo/lib/foo.dart ===
      //   package:foo/foo.dart
      if (to.pathSegments.length > 1 && to.pathSegments[1] == 'lib') {
        return assetToPackageUrl(to);
      }
      var from = element.source.uri;
      // Normalize (convert to an asset: URL).
      from = normalizeUrl(from);
      if (_isRelative(from, to)) {
        if (from == to) {
          // Edge-case: p.relative('a.dart', 'a.dart') == '.', but that is not
          // a valid import URL in Dart source code.
          return Uri(path: to.pathSegments.last);
        }
        final relative = p.toUri(
          p.relative(
            to.toString(),
            from: from.toString(),
          ),
        );
        // We now have a URL like "../b.dart", but we just want "b.dart".
        return relative.replace(
          pathSegments: relative.pathSegments.skip(1),
        );
      }
      throw ArgumentError.value(to, 'to', 'Not relative to $from');
    }
    throw ArgumentError.value(to, 'to', 'Cannot use scheme "${to.scheme}"');
  }