Implement URI resolution in the front end.

pkg/front_end/test/src/base/uri_resolver_test.dart

+// Copyright (c) 2016, 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:front_end/src/base/uri_resolver.dart';
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(UriResolverTestNative);
+    defineReflectiveTests(UriResolverTestPosix);
+    defineReflectiveTests(UriResolverTestWindows);
+  });
+}
+
+/// Generic URI resolver tests which do not depend on the particular path
+/// context in use.
+abstract class UriResolverTest {
+  p.Context get pathContext;
+
+  void test_dart() {
+    _expectResolution('dart:core', _p('sdk/lib/core/core.dart'));
+    _expectResolution('dart:async', _p('sdk/lib/async/async.dart'));
+  }
+
+  void test_dartLeadingSlash() {
+    _expectResolution('dart:/core', null);
+  }
+
+  void test_dartLeadingSlash2() {
+    _expectResolution('dart://core', null);
+  }
+
+  void test_dartLeadingSlash3() {
+    _expectResolution('dart:///core', null);
+  }
+
+  void test_dartPart() {
+    _expectResolution('dart:core/bool.dart', _p('sdk/lib/core/bool.dart'));
+  }
+
+  void test_file() {
+    _expectResolution('file:///foo.dart', _p('foo.dart'));
+  }
+
+  void test_fileLongPath() {
+    _expectResolution('file:///foo/bar.dart', _p('foo/bar.dart'));
+  }
+
+  void test_noSchemeAbsolute() {
+    _expectResolution('/foo.dart', null);
+  }
+
+  void test_noSchemeRelative() {
+    _expectResolution('foo.dart', null);
+  }
+
+  void test_package() {
+    _expectResolution('package:foo/bar.dart', _p('packages/foo/lib/bar.dart'));
+    _expectResolution('package:bar/baz.dart', _p('packages/bar/lib/baz.dart'));
+  }
+
+  void test_packageLeadingSlash() {
+    _expectResolution('package:/foo', null);
+  }
+
+  void test_packageLeadingSlash2() {
+    _expectResolution('package://foo', null);
+  }
+
+  void test_packageLeadingSlash3() {
+    _expectResolution('package:///foo', null);
+  }
+
+  void test_packageLongPath() {
+    _expectResolution(
+        'package:foo/bar/baz.dart', _p('packages/foo/lib/bar/baz.dart'));
+  }
+
+  void test_packageNoPath() {
+    // In practice "package:foo/" is meaningless.  But the VM treats it as
+    // resolving to the package's lib directory (and then later reports the
+    // error when trying to open that directory as a file), so for consistency
+    // we do the same.
+    _expectResolution('package:foo/', _p('packages/foo/lib/'));
+  }
+
+  void test_packageNoSlash() {
+    _expectResolution('package:foo', null);
+  }
+
+  void test_packageUnmatchedName() {
+    _expectResolution('package:doesNotExist/foo.dart', null);
+  }
+
+  /// Verifies that the resolution of [uriString] produces the path
+  /// [expectedResult].
+  void _expectResolution(String uriString, String expectedResult) {
+    var packages = {
+      'foo': _u('packages/foo/lib/'),
+      'bar': _u('packages/bar/lib/')
+    };
+    var sdkLibraries = {
+      'core': _u('sdk/lib/core/core.dart'),
+      'async': _u('sdk/lib/async/async.dart')
+    };
+    var uriResolver = new UriResolver(packages, sdkLibraries, pathContext);
+    expect(uriResolver.resolve(Uri.parse(uriString)), expectedResult);
+  }
+
+  /// Converts a posix style path into a path appropriate for the current path
+  /// context.
+  String _p(String posixPath) {
+    return pathContext.fromUri(_u(posixPath));
+  }
+
+  /// Converts a posix style path into a file URI.
+  Uri _u(String posixPath) => Uri.parse('file:///$posixPath');
+}
+
+/// Override of [UriResolverTest] which uses the native path context for the
+/// platform the test is running on.
+@reflectiveTest
+class UriResolverTestNative extends UriResolverTest {
+  final p.Context pathContext = p.context;
+}
+
+/// Override of [UriResolverTest] which uses a posix path context, regardless of
+/// the platform the test is running on.
+@reflectiveTest
+class UriResolverTestPosix extends UriResolverTest {
+  final p.Context pathContext = p.posix;
+}
+
+/// Override of [UriResolverTest] which uses a windows path context, regardless
+/// of the platform the test is running on.
+@reflectiveTest
+class UriResolverTestWindows extends UriResolverTest {
+  final p.Context pathContext = p.windows;
+
+  void test_fileWindowsLocal() {
+    _expectResolution('file:///C:/foo/bar.dart', r'C:\foo\bar.dart');
+  }
+
+  void test_fileWindowsUNC() {
+    _expectResolution(
+        'file://computer/directory/foo.dart', r'\\computer\directory\foo.dart');
+  }
+}