pkg/kernel/lib/testing/mock_sdk_component.dart

// Copyright (c) 2017, 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';

/// Returns a [Component] object containing empty definitions of core SDK
/// classes.
Component createMockSdkComponent() {
  Library coreLib = new Library(Uri.parse('dart:core'),
      name: 'dart.core', fileUri: Uri.parse('dart:core'));
  Library asyncLib = new Library(Uri.parse('dart:async'),
      name: 'dart.async', fileUri: Uri.parse('dart:async'));
  Library internalLib = new Library(Uri.parse('dart:_internal'),
      name: 'dart._internal', fileUri: Uri.parse('dart:_internal'));

  Class objectClass = new Class(name: 'Object', fileUri: coreLib.fileUri);
  coreLib.addClass(objectClass);

  Class addClass(Library lib, String name,
      {Supertype? supertype,
      List<TypeParameter>? typeParameters,
      List<Supertype>? implementedTypes}) {
    Class c = new Class(
        name: name,
        supertype: supertype ?? objectClass.asThisSupertype,
        typeParameters: typeParameters,
        implementedTypes: implementedTypes,
        fileUri: lib.fileUri);
    lib.addClass(c);
    return c;
  }

  InterfaceType objectType =
      new InterfaceType(objectClass, coreLib.nonNullable);

  TypeParameter typeParam(String name, [DartType? bound]) {
    return new TypeParameter(name, bound ?? objectType);
  }

  addClass(coreLib, 'Null');
  addClass(coreLib, 'bool');
  Class num = addClass(coreLib, 'num');
  addClass(coreLib, 'String');
  Class iterable =
      addClass(coreLib, 'Iterable', typeParameters: [typeParam('T')]);
  {
    TypeParameter T = typeParam('T');
    addClass(coreLib, 'List', typeParameters: [
      T
    ], implementedTypes: [
      new Supertype(iterable,
          [new TypeParameterType.withDefaultNullabilityForLibrary(T, coreLib)])
    ]);
  }
  addClass(coreLib, 'Map', typeParameters: [typeParam('K'), typeParam('V')]);
  addClass(coreLib, 'int', supertype: num.asThisSupertype);
  addClass(coreLib, 'double', supertype: num.asThisSupertype);
  addClass(coreLib, 'Iterator', typeParameters: [typeParam('T')]);
  addClass(coreLib, 'Symbol');
  addClass(coreLib, 'Type');
  addClass(coreLib, 'Function');
  addClass(coreLib, 'Invocation');
  addClass(coreLib, 'Future', typeParameters: [typeParam('T')]);
  addClass(asyncLib, 'FutureOr', typeParameters: [typeParam('T')]);
  addClass(asyncLib, 'Stream', typeParameters: [typeParam('T')]);
  addClass(internalLib, 'Symbol');

  return new Component(libraries: [coreLib, asyncLib, internalLib]);
}