Initial hermetic package analyzer.

pkg/analyzer_cli/lib/src/package_analyzer.dart

Index: pkg/analyzer_cli/lib/src/package_analyzer.dart
diff --git a/pkg/analyzer_cli/lib/src/package_analyzer.dart b/pkg/analyzer_cli/lib/src/package_analyzer.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1b9c978dda138b4f4f05789f0501550315f150da
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+++ b/pkg/analyzer_cli/lib/src/package_analyzer.dart
@@ -0,0 +1,409 @@
+// 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 analyzer_cli.src.package_analyzer;
+
+import 'dart:core' hide Resource;
+import 'dart:io' as io;
+
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/context/cache.dart';
+import 'package:analyzer/src/context/context.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/resolver.dart';
+import 'package:analyzer/src/generated/sdk_io.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+import 'package:analyzer/src/summary/format.dart';
+import 'package:analyzer/src/summary/idl.dart';
+import 'package:analyzer/src/summary/resynthesize.dart';
+import 'package:analyzer/src/summary/summarize_elements.dart';
+import 'package:analyzer/src/summary/summary_sdk.dart';
+import 'package:analyzer/src/task/dart.dart';
+import 'package:analyzer/task/dart.dart';
+import 'package:analyzer/task/model.dart';
+import 'package:analyzer_cli/src/analyzer_impl.dart';
+import 'package:analyzer_cli/src/driver.dart';
+import 'package:analyzer_cli/src/error_formatter.dart';
+import 'package:analyzer_cli/src/options.dart';
+import 'package:path/path.dart' as pathos;
+
+/**
+ * If [uri] has the `package` scheme in form of `package:pkg/file.dart`,
+ * return the `pkg` name.  Otherwise return `null`.
+ */
+String getPackageName(Uri uri) {
+  if (uri.scheme != 'package') {
+    return null;
+  }
+  String path = uri.path;
+  int index = path.indexOf('/');
+  if (index == -1) {
+    return null;
+  }
+  return path.substring(0, index);
+}
+
+/**
+ * A concrete resynthesizer that serves summaries from given file paths.
+ */
+class FileBasedSummaryResynthesizer extends SummaryResynthesizer {
+  final Map<String, UnlinkedUnit> unlinkedMap = <String, UnlinkedUnit>{};
+  final Map<String, LinkedLibrary> linkedMap = <String, LinkedLibrary>{};
+
+  FileBasedSummaryResynthesizer(
+      SummaryResynthesizer parent,
+      AnalysisContext context,
+      TypeProvider typeProvider,
+      SourceFactory sourceFactory,
+      bool strongMode,
+      List<String> summaryPaths)
+      : super(parent, context, typeProvider, sourceFactory, strongMode) {
+    summaryPaths.forEach(_fillMaps);
+  }
+
+  @override
+  LinkedLibrary getLinkedSummary(String uri) {
+    return linkedMap[uri];
+  }
+
+  @override
+  UnlinkedUnit getUnlinkedSummary(String uri) {
+    return unlinkedMap[uri];
+  }
+
+  @override
+  bool hasLibrarySummary(String uri) {
+    return linkedMap.containsKey(uri);
+  }
+
+  void _fillMaps(String path) {
+    io.File file = new io.File(path);
+    List<int> buffer = file.readAsBytesSync();
+    SdkBundle bundle = new SdkBundle.fromBuffer(buffer);
+    for (int i = 0; i < bundle.unlinkedUnitUris.length; i++) {
+      unlinkedMap[bundle.unlinkedUnitUris[i]] = bundle.unlinkedUnits[i];
+    }
+    for (int i = 0; i < bundle.linkedLibraryUris.length; i++) {
+      linkedMap[bundle.linkedLibraryUris[i]] = bundle.linkedLibraries[i];
+    }
+  }
+}
+
+/**
+ * The [ResourceProvider] that provides results from input package summaries.
+ */
+class InputPackagesResultProvider extends ResultProvider {
+  final InternalAnalysisContext context;
+  final Map<String, String> packageSummaryInputs;
+
+  FileBasedSummaryResynthesizer resynthesizer;
+  SummaryResultProvider sdkProvider;
+
+  InputPackagesResultProvider(this.context, this.packageSummaryInputs) {
+    InternalAnalysisContext sdkContext = context.sourceFactory.dartSdk.context;
+    sdkProvider = sdkContext.resultProvider;
+    // Set the type provider to prevent the context from computing it.
+    context.typeProvider = sdkContext.typeProvider;
+    // Create a chained resynthesizer.
+    resynthesizer = new FileBasedSummaryResynthesizer(
+        sdkProvider.resynthesizer,
+        context,
+        context.typeProvider,
+        context.sourceFactory,
+        false,
+        packageSummaryInputs.values.toList());
+  }
+
+  bool compute(CacheEntry entry, ResultDescriptor result) {

[Paul Berry, 2016/02/23 00:59:29]

It looks like some of this code is duplicated from SdkSummaryResultProvider.  Is
it possible to share this code?

[scheglov, 2016/02/23 01:15:28]

Yes, probably some of it can be shared.
I will address this in a future CL.

+    if (sdkProvider.compute(entry, result)) {
+      return true;
+    }
+    AnalysisTarget target = entry.target;
+    // Only library results are supported for now.
+    if (target is Source) {
+      Uri uri = target.uri;
+      // We know how to server results to input packages.
+      String sourcePackageName = getPackageName(uri);
+      if (!packageSummaryInputs.containsKey(sourcePackageName)) {
+        return false;
+      }
+      // Provide known results.
+      String uriString = uri.toString();
+      if (result == LIBRARY_ELEMENT1 ||
+          result == LIBRARY_ELEMENT2 ||
+          result == LIBRARY_ELEMENT3 ||
+          result == LIBRARY_ELEMENT4 ||
+          result == LIBRARY_ELEMENT5 ||
+          result == LIBRARY_ELEMENT6 ||
+          result == LIBRARY_ELEMENT7 ||
+          result == LIBRARY_ELEMENT8 ||
+          result == LIBRARY_ELEMENT ||
+          false) {
+        LibraryElement libraryElement =
+            resynthesizer.getLibraryElement(uriString);
+        entry.setValue(result, libraryElement, TargetedResult.EMPTY_LIST);
+        return true;
+      } else if (result == READY_LIBRARY_ELEMENT2 ||
+          result == READY_LIBRARY_ELEMENT5 ||
+          result == READY_LIBRARY_ELEMENT6) {
+        entry.setValue(result, true, TargetedResult.EMPTY_LIST);
+        return true;
+      } else if (result == SOURCE_KIND) {
+        if (resynthesizer.linkedMap.containsKey(uriString)) {
+          entry.setValue(result, SourceKind.LIBRARY, TargetedResult.EMPTY_LIST);
+          return true;
+        }
+        if (resynthesizer.unlinkedMap.containsKey(uriString)) {
+          entry.setValue(result, SourceKind.PART, TargetedResult.EMPTY_LIST);
+          return true;
+        }
+        return false;
+      }
+    }
+    return false;
+  }
+}
+
+/**
+ * The [UriResolver] that knows about sources that are parts of packages which
+ * are served from their summaries.
+ */
+class InSummaryPackageUriResolver extends UriResolver {

[Brian Wilkerson, 2016/02/23 00:27:01]

I don't understand the need for either this class or InSummarySource. We should
talk offline.

[scheglov, 2016/02/23 01:15:28]

Yes, we did not get to this part offline today.

+  final Map<String, String> packageSummaryInputs;
+
+  InSummaryPackageUriResolver(this.packageSummaryInputs);
+
+  @override
+  Source resolveAbsolute(Uri uri, [Uri actualUri]) {
+    actualUri ??= uri;
+    String packageName = getPackageName(actualUri);
+    if (packageSummaryInputs.containsKey(packageName)) {
+      return new InSummarySource(actualUri);
+    }
+    return null;
+  }
+}
+
+/**
+ * A placeholder of a source that is part of a package whose analysis results
+ * are served from its summary.  This source uses its URI as [fullName] and has
+ * empty contents.
+ */
+class InSummarySource extends Source {
+  final Uri uri;
+
+  InSummarySource(this.uri);
+
+  @override
+  TimestampedData<String> get contents => new TimestampedData<String>(0, '');
+
+  @override
+  String get encoding => uri.toString();
+
+  @override
+  String get fullName => encoding;
+
+  @override
+  bool get isInSystemLibrary => false;
+
+  @override
+  int get modificationStamp => 0;
+
+  @override
+  String get shortName => pathos.basename(fullName);
+
+  @override
+  UriKind get uriKind => UriKind.PACKAGE_URI;
+
+  @override
+  bool exists() => true;
+
+  @override
+  Uri resolveRelativeUri(Uri relativeUri) {
+    Uri baseUri = uri;
+    return baseUri.resolveUri(relativeUri);
+  }
+
+  @override
+  String toString() => uri.toString();
+}
+
+/**
+ * The hermetic whole package analyzer.
+ */
+class PackageAnalyzer {
+  final CommandLineOptions options;
+
+  String packagePath;
+  String packageLibPath;
+
+  final ResourceProvider resourceProvider = PhysicalResourceProvider.INSTANCE;
+  InternalAnalysisContext context;
+  final List<Source> explicitSources = <Source>[];
+
+  final List<String> linkedLibraryUris = <String>[];
+  final List<LinkedLibraryBuilder> linkedLibraries = <LinkedLibraryBuilder>[];
+  final List<String> unlinkedUnitUris = <String>[];
+  final List<UnlinkedUnitBuilder> unlinkedUnits = <UnlinkedUnitBuilder>[];
+
+  PackageAnalyzer(this.options);
+
+  /**
+   * Perform package analysis according to the given [options].
+   */
+  ErrorSeverity analyze() {
+    packagePath = options.packageModePath;
+    packageLibPath = resourceProvider.pathContext.join(packagePath, 'lib');
+    if (packageLibPath == null) {
+      errorSink.writeln('--package-mode-path must be set to the root '
+          'folder of the package to analyze.');
+      io.exitCode = ErrorSeverity.ERROR.ordinal;
+      return ErrorSeverity.ERROR;
+    }
+
+    // Write the progress message.
+    if (!options.machineFormat) {
+      outSink.writeln("Analyzing sources ${options.sourceFiles}...");
+    }
+
+    // Prepare the analysis context.
+    _createContext();
+
+    // Add sources.
+    ChangeSet changeSet = new ChangeSet();
+    for (String path in options.sourceFiles) {
+      if (AnalysisEngine.isDartFileName(path)) {
+        path = resourceProvider.pathContext.absolute(path);
+        File file = resourceProvider.getFile(path);
+        if (!file.exists) {
+          errorSink.writeln('File not found: $path');
+          io.exitCode = ErrorSeverity.ERROR.ordinal;
+          return ErrorSeverity.ERROR;
+        }
+        Source source = _createSourceInContext(file);
+        explicitSources.add(source);
+        changeSet.addedSource(source);
+      }
+    }
+    context.applyChanges(changeSet);
+
+    // Perform full analysis.
+    while (true) {
+      AnalysisResult analysisResult = context.performAnalysisTask();
+      if (!analysisResult.hasMoreWork) {
+        break;
+      }
+    }
+
+    // Write summary for Dart libraries.
+    if (options.packageSummaryOutput != null) {
+      for (Source source in context.librarySources) {
+        if (pathos.isWithin(packageLibPath, source.fullName)) {
+          LibraryElement libraryElement = context.getLibraryElement(source);
+          if (libraryElement != null) {
+            _serializeSingleLibrary(libraryElement);
+          }
+        }
+      }
+      // Write the whole package bundle.
+      SdkBundleBuilder sdkBundle = new SdkBundleBuilder(

[Brian Wilkerson, 2016/02/23 00:27:01]

Probably ought to rename SdkBundleBuilder at some point if it's going to be used
for building packages too.

[Paul Berry, 2016/02/23 00:59:29]

Agreed.  I have some other changes I want to make to SdkBundle/SdkBundleBuilder
in a future CL, so I will do the rename at that time.

[scheglov, 2016/02/23 01:15:28]

Yes, it was quite obvious that we need to rename it.
I just wanted to make some progress in the analysis and clean it up later.
Sure, Paul, make these changes.

+          linkedLibraryUris: linkedLibraryUris,
+          linkedLibraries: linkedLibraries,
+          unlinkedUnitUris: unlinkedUnitUris,
+          unlinkedUnits: unlinkedUnits);
+      io.File file = new io.File(options.packageSummaryOutput);
+      file.writeAsBytesSync(sdkBundle.toBuffer(), mode: io.FileMode.WRITE_ONLY);
+    }
+
+    // Process errors.
+    _printErrors();
+    return _computeMaxSeverity();
+  }
+
+  ErrorSeverity _computeMaxSeverity() {
+    ErrorSeverity maxSeverity = ErrorSeverity.NONE;
+    for (Source source in explicitSources) {
+      AnalysisErrorInfo errorInfo = context.getErrors(source);
+      for (AnalysisError error in errorInfo.errors) {
+        ProcessedSeverity processedSeverity =
+            AnalyzerImpl.processError(error, options, context);
+        if (processedSeverity != null) {
+          maxSeverity = maxSeverity.max(processedSeverity.severity);
+        }
+      }
+    }
+    return maxSeverity;
+  }
+
+  void _createContext() {
+    DirectoryBasedDartSdk sdk = DirectoryBasedDartSdk.defaultSdk;
+    sdk.useSummary = true;
+
+    // Create the context.
+    context = AnalysisEngine.instance.createAnalysisContext();
+    context.typeProvider = sdk.context.typeProvider;
+    context.sourceFactory = new SourceFactory(<UriResolver>[
+      new DartUriResolver(sdk),
+      new InSummaryPackageUriResolver(options.packageSummaryInputs),
+      new PackageMapUriResolver(resourceProvider, <String, List<Folder>>{
+        options.packageName: <Folder>[
+          resourceProvider.getFolder(packageLibPath)
+        ],
+      }),
+      new FileUriResolver()
+    ]);
+    context.resultProvider =
+        new InputPackagesResultProvider(context, options.packageSummaryInputs);
+
+    // Set context options.
+    Driver.setAnalysisContextOptions(
+        context, options, (AnalysisOptionsImpl contextOptions) {});
+  }
+
+  /**
+   * Create and return a source representing the given [file].
+   */
+  Source _createSourceInContext(File file) {
+    Source source = file.createSource();
+    if (context == null) {
+      return source;
+    }
+    Uri uri = context.sourceFactory.restoreUri(source);
+    return file.createSource(uri);
+  }
+
+  /**
+   * Print errors for all explicit sources.
+   */
+  void _printErrors() {
+    StringSink sink = options.machineFormat ? errorSink : outSink;
+    ErrorFormatter formatter = new ErrorFormatter(
+        sink,
+        options,
+        (AnalysisError error) =>
+            AnalyzerImpl.processError(error, options, context));
+    for (Source source in explicitSources) {
+      AnalysisErrorInfo errorInfo = context.getErrors(source);
+      formatter.formatErrors([errorInfo]);
+    }
+  }
+
+  /**
+   * Serialize the library with the given [element].
+   */
+  void _serializeSingleLibrary(LibraryElement element) {
+    String uri = element.source.uri.toString();
+    LibrarySerializationResult libraryResult =
+        serializeLibrary(element, context.typeProvider, options.strongMode);
+    linkedLibraryUris.add(uri);
+    linkedLibraries.add(libraryResult.linked);
+    unlinkedUnitUris.addAll(libraryResult.unitUris);
+    unlinkedUnits.addAll(libraryResult.unlinkedUnits);
+  }
+}