Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/code_transformers/src/dart_sdk.dart

+// Copyright (c) 2014, 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 code_transformers.src.dart_sdk;
+
+import 'dart:convert' as convert;
+import 'dart:io' show File, Link, Platform, Process;
+import 'package:path/path.dart' as path;
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/java_io.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/sdk_io.dart' show DirectoryBasedDartSdk;
+import 'package:analyzer/src/generated/source.dart';
+
+
+/// Attempts to provide the current Dart SDK directory.
+///
+/// This will return null if the SDK cannot be found
+///
+/// Note that this may not be correct when executing outside of `pub`.
+String get dartSdkDirectory {
+
+  bool isSdkDir(String dirname) =>
+      new File(path.join(dirname, 'lib', '_internal', 'libraries.dart'))
+      .existsSync();
+
+  String executable = Platform.executable;
+  if (path.split(executable).length == 1) {
+    // TODO(blois): make this cross-platform.
+    // HACK: A single part, hope it's on the path.
+    executable = Process.runSync('which', ['dart'],
+        stdoutEncoding: convert.UTF8).stdout.trim();
+    // In case Dart is symlinked (e.g. homebrew on Mac) follow symbolic links.
+    var link = new Link(executable);
+    if (link.existsSync()) {
+      executable = link.resolveSymbolicLinksSync();
+    }
+    var sdkDir = path.dirname(path.dirname(executable));
+    if (isSdkDir(sdkDir)) return sdkDir;
+  }
+
+  var dartDir = path.dirname(path.absolute(executable));
+  // If there's a sub-dir named dart-sdk then we're most likely executing from
+  // a dart enlistment build directory.
+  if (isSdkDir(path.join(dartDir, 'dart-sdk'))) {
+    return path.join(dartDir, 'dart-sdk');
+  }
+  // If we can find libraries.dart then it's the root of the SDK.
+  if (isSdkDir(dartDir)) return dartDir;
+
+  var parts = path.split(dartDir);
+  // If the dart executable is within the sdk dir then get the root.
+  if (parts.contains('dart-sdk')) {
+    var dartSdkDir = path.joinAll(parts.take(parts.indexOf('dart-sdk') + 1));
+    if (isSdkDir(dartSdkDir)) return dartSdkDir;
+  }
+
+  return null;
+}
+
+/// Sources that are annotated with a source uri, so it is easy to resolve how
+/// to support `Resolver.getImportUri`.
+abstract class UriAnnotatedSource extends Source {
+  Uri get uri;
+}
+
+/// Dart SDK which wraps all Dart sources as [UriAnnotatedSource] to ensure they
+/// are tracked with Uris.
+class DirectoryBasedDartSdkProxy extends DirectoryBasedDartSdk {
+  DirectoryBasedDartSdkProxy(String sdkDirectory)
+      : super(new JavaFile(sdkDirectory));
+
+  Source mapDartUri(String dartUri) =>
+      DartSourceProxy.wrap(super.mapDartUri(dartUri), Uri.parse(dartUri));
+}
+
+/// Dart SDK resolver which wraps all Dart sources to ensure they are tracked
+/// with URIs.
+class DartUriResolverProxy implements DartUriResolver {
+  final DartUriResolver _proxy;
+  DartUriResolverProxy(DartSdk sdk) :
+      _proxy = new DartUriResolver(sdk);
+
+  Source resolveAbsolute(Uri uri) =>
+    DartSourceProxy.wrap(_proxy.resolveAbsolute(uri), uri);
+
+  DartSdk get dartSdk => _proxy.dartSdk;
+
+  Source fromEncoding(UriKind kind, Uri uri) =>
+      throw new UnsupportedError('fromEncoding is not supported');
+
+  Uri restoreAbsolute(Source source) =>
+      throw new UnsupportedError('restoreAbsolute is not supported');
+}
+
+/// Source file for dart: sources which track the sources with dart: URIs.
+///
+/// This is primarily to support [Resolver.getImportUri] for Dart SDK (dart:)
+/// based libraries.
+class DartSourceProxy implements UriAnnotatedSource {
+
+  /// Absolute URI which this source can be imported from
+  final Uri uri;
+
+  /// Underlying source object.
+  final Source _proxy;
+
+  DartSourceProxy(this._proxy, this.uri);
+
+  /// Ensures that [source] is a DartSourceProxy.
+  static DartSourceProxy wrap(Source source, Uri uri) {
+    if (source == null || source is DartSourceProxy) return source;
+    return new DartSourceProxy(source, uri);
+  }
+
+  // Note: to support both analyzer versions <0.22.0 and analyzer >=0.22.0, we
+  // implement both `resolveRelative` and `resolveRelativeUri`. Only one of them
+  // is available at a time in the analyzer package, so we use the `as dynamic`
+  // in these methods to hide warnings for the code that is missing. These APIs
+  // are invoked from the analyzer itself, so we don't expect them to cause
+  // failures.
+  Source resolveRelative(Uri relativeUri) {
+    // Assume that the type can be accessed via this URI, since these
+    // should only be parts for dart core files.
+    return wrap((_proxy as dynamic).resolveRelative(relativeUri), uri);
+  }
+
+  Uri resolveRelativeUri(Uri relativeUri) {
+    return (_proxy as dynamic).resolveRelativeUri(relativeUri);
+  }
+
+  bool exists() => _proxy.exists();
+
+  bool operator ==(Object other) =>
+    (other is DartSourceProxy && _proxy == other._proxy);
+
+  int get hashCode => _proxy.hashCode;
+
+  TimestampedData<String> get contents => _proxy.contents;
+
+  String get encoding => _proxy.encoding;
+
+  String get fullName => _proxy.fullName;
+
+  int get modificationStamp => _proxy.modificationStamp;
+
+  String get shortName => _proxy.shortName;
+
+  UriKind get uriKind => _proxy.uriKind;
+
+  bool get isInSystemLibrary => _proxy.isInSystemLibrary;
+}
+
+
+/// Dart SDK which contains a mock implementation of the SDK libraries. May be
+/// used to speed up resultion when most of the core libraries is not needed.
+class MockDartSdk implements DartSdk {
+  final Map<Uri, _MockSdkSource> _sources = {};
+  final bool reportMissing;
+  final Map<String, SdkLibrary> _libs = {};
+  final String sdkVersion = '0';
+  List<String> get uris => _sources.keys.map((uri) => '$uri').toList();
+  final AnalysisContext context = new SdkAnalysisContext();
+  DartUriResolver _resolver;
+  DartUriResolver get resolver => _resolver;
+
+  MockDartSdk(Map<String, String> sources, {this.reportMissing}) {
+    sources.forEach((uriString, contents) {
+      var uri = Uri.parse(uriString);
+      _sources[uri] = new _MockSdkSource(uri, contents);
+      _libs[uriString] = new SdkLibraryImpl(uri.path)
+        ..setDart2JsLibrary()
+        ..setVmLibrary();
+    });
+    _resolver = new DartUriResolver(this);
+    context.sourceFactory = new SourceFactory([_resolver]);
+  }
+
+  List<SdkLibrary> get sdkLibraries => _libs.values.toList();
+  SdkLibrary getSdkLibrary(String dartUri) => _libs[dartUri];
+  Source mapDartUri(String dartUri) => _getSource(Uri.parse(dartUri));
+
+  Source fromEncoding(UriKind kind, Uri uri) {
+    if (kind != UriKind.DART_URI) {
+      throw new UnsupportedError('expected dart: uri kind, got $kind.');
+    }
+    return _getSource(uri);
+  }
+
+  Source _getSource(Uri uri) {
+    var src = _sources[uri];
+    if (src == null) {
+      if (reportMissing) print('warning: missing mock for $uri.');
+      _sources[uri] = src =
+          new _MockSdkSource(uri, 'library dart.${uri.path};');
+    }
+    return src;
+  }
+
+  @override
+  Source fromFileUri(Uri uri) {
+    throw new UnsupportedError('MockDartSdk.fromFileUri');
+  }
+}
+
+class _MockSdkSource implements UriAnnotatedSource {
+  /// Absolute URI which this source can be imported from.
+  final Uri uri;
+  final String _contents;
+
+  _MockSdkSource(this.uri, this._contents);
+
+  bool exists() => true;
+
+  int get hashCode => uri.hashCode;
+
+  final int modificationStamp = 1;
+
+  TimestampedData<String> get contents =>
+      new TimestampedData(modificationStamp, _contents);
+
+  String get encoding => "${uriKind.encoding}$uri";
+
+  String get fullName => shortName;
+
+  String get shortName => uri.path;
+
+  UriKind get uriKind => UriKind.DART_URI;
+
+  bool get isInSystemLibrary => true;
+
+  Source resolveRelative(Uri relativeUri) =>
+      throw new UnsupportedError('not expecting relative urls in dart: mocks');
+
+  Uri resolveRelativeUri(Uri relativeUri) =>
+      throw new UnsupportedError('not expecting relative urls in dart: mocks');
+}