Move SdkExtUriResolver from analysis_server to analyzer so it can be used in analyzer_cli

pkg/analysis_server/test/src/sdk_ext_test.dart

-// Copyright (c) 2015, 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.
-
-library analysis_server.test.src.sdk_ext;
-
-import 'package:analysis_server/src/sdk_ext.dart';
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/file_system/memory_file_system.dart';
-import 'package:unittest/unittest.dart';
-
-MemoryResourceProvider resourceProvider;
-
-buildResourceProvider() {
-  resourceProvider = new MemoryResourceProvider();
-  resourceProvider.newFolder('/empty');
-  resourceProvider.newFolder('/tmp');
-  resourceProvider.newFile('/tmp/.sdkext', r'''
-  {
-    "dart:fox": "slippy.dart",
-    "dart:bear": "grizzly.dart",
-    "dart:relative": "../relative.dart",
-    "dart:deep": "deep/directory/file.dart",
-    "fart:loudly": "nomatter.dart"
-  }''');
-}
-
-clearResourceProvider() {
-  resourceProvider = null;
-}
-
-main() {
-  groupSep = ' | ';
-  group('SdkExtUriResolverTest', () {
-    setUp(() {
-      buildResourceProvider();
-    });
-    tearDown(() {
-      clearResourceProvider();
-    });
-    test('test_NullPackageMap', () {
-      var resolver = new SdkExtUriResolver(null);
-      expect(resolver.length, equals(0));
-    });
-    test('test_NoSdkExtPackageMap', () {
-      var resolver = new SdkExtUriResolver({
-        'fox': [resourceProvider.getResource('/empty')]
-      });
-      expect(resolver.length, equals(0));
-    });
-    test('test_SdkExtPackageMap', () {
-      var resolver = new SdkExtUriResolver({
-        'fox': [resourceProvider.getResource('/tmp')]
-      });
-      // We have four mappings.
-      expect(resolver.length, equals(4));
-      // Check that they map to the correct paths.
-      expect(resolver['dart:fox'], equals("/tmp/slippy.dart"));
-      expect(resolver['dart:bear'], equals("/tmp/grizzly.dart"));
-      expect(resolver['dart:relative'], equals("/relative.dart"));
-      expect(resolver['dart:deep'], equals("/tmp/deep/directory/file.dart"));
-    });
-    test('test_BadJSON', () {
-      var resolver = new SdkExtUriResolver(null);
-      resolver.addSdkExt(r'''{{{,{{}}},}}''', null);
-      expect(resolver.length, equals(0));
-    });
-    test('test_restoreAbsolute', () {
-      var resolver = new SdkExtUriResolver({
-        'fox': [resourceProvider.getResource('/tmp')]
-      });
-      var source = resolver.resolveAbsolute(Uri.parse('dart:fox'));
-      expect(source, isNotNull);
-      // Restore source's uri.
-      var restoreUri = resolver.restoreAbsolute(source);
-      expect(restoreUri, isNotNull);
-      // Verify that it is 'dart:fox'.
-      expect(restoreUri.toString(), equals('dart:fox'));
-      expect(restoreUri.scheme, equals('dart'));
-      expect(restoreUri.path, equals('fox'));
-    });
-    test('test_resolvePart', () {
-      var resolver = new SdkExtUriResolver({
-        'fox': [resourceProvider.getResource('/tmp')]
-      });
-      var source = resolver.resolveAbsolute(Uri.parse('dart:fox/foo.dart'));
-      expect(source, isNotNull);
-      // Restore source's uri.
-      var restoreUri = resolver.restoreAbsolute(source);
-      expect(restoreUri, isNotNull);
-      // Verify that it is 'dart:fox/foo.dart'.
-      expect(restoreUri.toString(), equals('dart:fox/foo.dart'));
-      expect(restoreUri.scheme, equals('dart'));
-      expect(restoreUri.path, equals('fox/foo.dart'));
-    });
-  });
-}