pkg/front_end/lib/src/fasta/uris.dart

// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:kernel/ast.dart';

final Uri dartCore = Uri.parse('dart:core');
final Uri missingUri = Uri.parse('org-dartlang-internal:missing');

const String MALFORMED_URI_SCHEME = "org-dartlang-malformed-uri";

bool isNotMalformedUriScheme(Uri uri) => !uri.isScheme(MALFORMED_URI_SCHEME);

/// Translate a parts "partUri" to an actual uri with handling of invalid uris.
///
/// ```
/// DartDocTest(
///   getPartUri(
///     Uri.parse("file://path/to/parent.dart"),
///     new LibraryPart([], "simple.dart")
///   ),
///   Uri.parse("file://path/to/simple.dart")
/// )
/// DartDocTest(
///   getPartUri(
///     Uri.parse("file://path/to/parent.dart"),
///     new LibraryPart([], "dir/simple.dart")
///   ),
///   Uri.parse("file://path/to/dir/simple.dart")
/// )
/// DartDocTest(
///   getPartUri(
///     Uri.parse("file://path/to/parent.dart"),
///     new LibraryPart([], "../simple.dart")
///   ),
///   Uri.parse("file://path/simple.dart")
/// )
/// DartDocTest(
///   getPartUri(
///     Uri.parse("file://path/to/parent.dart"),
///     new LibraryPart([], "file:///my/path/absolute.dart")
///   ),
///   Uri.parse("file:///my/path/absolute.dart")
/// )
/// DartDocTest(
///   getPartUri(
///     Uri.parse("file://path/to/parent.dart"),
///     new LibraryPart([], "package:foo/hello.dart")
///   ),
///   Uri.parse("package:foo/hello.dart")
/// )
/// ```
/// And with invalid part uri:
/// ```
/// DartDocTest(
///   getPartUri(
///     Uri.parse("file://path/to/parent.dart"),
///     new LibraryPart([], ":hello")
///   ),
///   new Uri(scheme: MALFORMED_URI_SCHEME,
///     query: Uri.encodeQueryComponent(":hello"))
/// )
/// ```
Uri getPartUri(Uri parentUri, LibraryPart part) {
  try {
    return parentUri.resolve(part.partUri);
  } on FormatException {
    // This is also done in [SourceLibraryBuilder.resolve]
    return new Uri(
        scheme: MALFORMED_URI_SCHEME,
        query: Uri.encodeQueryComponent(part.partUri));
  }
}