Reapply "Move the linter core to the analyzer package"

pkg/analyzer/lib/src/lint/analysis.dart

Index: pkg/analyzer/lib/src/lint/analysis.dart
diff --git a/pkg/analyzer/lib/src/lint/analysis.dart b/pkg/analyzer/lib/src/lint/analysis.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f779e5451bfc32353ac607a33a049b782a189d20
--- /dev/null
+++ b/pkg/analyzer/lib/src/lint/analysis.dart
@@ -0,0 +1,262 @@
+// 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.
+
+import 'dart:collection';
+import 'dart:io' as io;
+
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/file_system/file_system.dart'
+    show File, Folder, ResourceProvider, ResourceUriResolver;
+import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/context/builder.dart';
+import 'package:analyzer/src/dart/sdk/sdk.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+import 'package:analyzer/src/lint/io.dart';
+import 'package:analyzer/src/lint/linter.dart';
+import 'package:analyzer/src/lint/project.dart';
+import 'package:analyzer/src/lint/registry.dart';
+import 'package:analyzer/src/services/lint.dart';
+import 'package:cli_util/cli_util.dart' as cli_util;
+import 'package:package_config/packages.dart' show Packages;
+import 'package:package_config/packages_file.dart' as pkgfile show parse;
+import 'package:package_config/src/packages_impl.dart' show MapPackages;
+import 'package:path/path.dart' as p;
+import 'package:plugin/manager.dart';
+import 'package:plugin/plugin.dart';
+
+Source createSource(Uri sourceUri) {
+  return PhysicalResourceProvider.INSTANCE
+      .getFile(sourceUri.toFilePath())
+      .createSource(sourceUri);
+}
+
+/// Print the given message and exit with the given [exitCode]
+void printAndFail(String message, {int exitCode: 15}) {
+  print(message);
+  io.exit(exitCode);
+}
+
+AnalysisOptions _buildAnalyzerOptions(DriverOptions options) {
+  AnalysisOptionsImpl analysisOptions = new AnalysisOptionsImpl();
+  analysisOptions.strongMode = options.strongMode;
+  analysisOptions.hint = false;
+  analysisOptions.lint = options.enableLints;
+  analysisOptions.generateSdkErrors = options.showSdkWarnings;
+  analysisOptions.enableTiming = options.enableTiming;
+  return analysisOptions;
+}
+
+class AnalysisDriver {
+  /// The sources which have been analyzed so far.  This is used to avoid
+  /// analyzing a source more than once, and to compute the total number of
+  /// sources analyzed for statistics.
+  Set<Source> _sourcesAnalyzed = new HashSet<Source>();
+
+  final LinterOptions options;
+
+  AnalysisDriver(this.options) {
+    _processPlugins();
+  }
+
+  /// Return the number of sources that have been analyzed so far.
+  int get numSourcesAnalyzed => _sourcesAnalyzed.length;
+
+  List<UriResolver> get resolvers {
+    // TODO(brianwilkerson) Use the context builder to compute all of the resolvers.
+    ResourceProvider resourceProvider = PhysicalResourceProvider.INSTANCE;
+    ContextBuilder builder = new ContextBuilder(resourceProvider, null, null);
+
+    DartSdk sdk = options.mockSdk ??
+        new FolderBasedDartSdk(
+            resourceProvider, resourceProvider.getFolder(sdkDir));
+
+    List<UriResolver> resolvers = [new DartUriResolver(sdk)];
+
+    if (options.packageRootPath != null) {
+      // TODO(brianwilkerson) After 0.30.0 is published, clean up the following.
+      try {
+        // Try to use the post 0.30.0 API.
+        (builder as dynamic).builderOptions.defaultPackagesDirectoryPath =
+            options.packageRootPath;
+      } catch (_) {
+        // If that fails, fall back to the pre 0.30.0 API.
+        (builder as dynamic).defaultPackagesDirectoryPath =
+            options.packageRootPath;
+      }
+      Map<String, List<Folder>> packageMap =
+          builder.convertPackagesToMap(builder.createPackageMap(null));
+      resolvers.add(new PackageMapUriResolver(resourceProvider, packageMap));
+    }
+
+    // File URI resolver must come last so that files inside "/lib" are
+    // are analyzed via "package:" URI's.
+    resolvers.add(new ResourceUriResolver(resourceProvider));
+    return resolvers;
+  }
+
+  String get sdkDir {
+    if (options.dartSdkPath != null) {
+      return options.dartSdkPath;
+    }
+    // In case no SDK has been specified, fall back to inferring it
+    // TODO: pass args to cli_util
+    return cli_util.getSdkDir().path;
+  }
+
+  List<AnalysisErrorInfo> analyze(Iterable<io.File> files) {
+    AnalysisContext context = AnalysisEngine.instance.createAnalysisContext();
+    context.analysisOptions = _buildAnalyzerOptions(options);
+    registerLinters(context);
+
+    Packages packages = _getPackageConfig();
+
+    context.sourceFactory = new SourceFactory(resolvers, packages);
+    AnalysisEngine.instance.logger = new StdLogger();
+
+    List<Source> sources = [];
+    ChangeSet changeSet = new ChangeSet();
+    for (io.File file in files) {
+      File sourceFile = PhysicalResourceProvider.INSTANCE
+          .getFile(p.normalize(file.absolute.path));
+      Source source = sourceFile.createSource();
+      Uri uri = context.sourceFactory.restoreUri(source);
+      if (uri != null) {
+        // Ensure that we analyze the file using its canonical URI (e.g. if
+        // it's in "/lib", analyze it using a "package:" URI).
+        source = sourceFile.createSource(uri);
+      }
+      sources.add(source);
+      changeSet.addedSource(source);
+    }
+    context.applyChanges(changeSet);
+
+    // Temporary location
+    var project = new DartProject(context, sources);
+    // This will get pushed into the generator (or somewhere comparable) when
+    // we have a proper plugin.
+    Registry.ruleRegistry.forEach((lint) {
+      if (lint is ProjectVisitor) {
+        (lint as ProjectVisitor).visit(project);
+      }
+    });
+
+    List<AnalysisErrorInfo> errors = [];
+
+    for (Source source in sources) {
+      context.computeErrors(source);
+      errors.add(context.getErrors(source));
+      _sourcesAnalyzed.add(source);
+    }
+
+    if (options.visitTransitiveClosure) {
+      // In the process of computing errors for all the sources in [sources],
+      // the analyzer has visited the transitive closure of all libraries
+      // referenced by those sources.  So now we simply need to visit all
+      // library sources known to the analysis context, and all parts they
+      // refer to.
+      for (Source librarySource in context.librarySources) {
+        for (Source source in _getAllUnitSources(context, librarySource)) {
+          if (!_sourcesAnalyzed.contains(source)) {
+            context.computeErrors(source);
+            errors.add(context.getErrors(source));
+            _sourcesAnalyzed.add(source);
+          }
+        }
+      }
+    }
+
+    return errors;
+  }
+
+  void registerLinters(AnalysisContext context) {
+    if (options.enableLints) {
+      setLints(context, options.enabledLints?.toList(growable: false));
+    }
+  }
+
+  /// Yield the sources for all the compilation units constituting
+  /// [librarySource] (including the defining compilation unit).
+  Iterable<Source> _getAllUnitSources(
+      AnalysisContext context, Source librarySource) {
+    List<Source> result = <Source>[librarySource];
+    result.addAll(context
+        .getLibraryElement(librarySource)
+        .parts
+        .map((CompilationUnitElement e) => e.source));
+    return result;
+  }
+
+  Packages _getPackageConfig() {
+    if (options.packageConfigPath != null) {
+      String packageConfigPath = options.packageConfigPath;
+      Uri fileUri = new Uri.file(packageConfigPath);
+      try {
+        io.File configFile = new io.File.fromUri(fileUri).absolute;
+        List<int> bytes = configFile.readAsBytesSync();
+        Map<String, Uri> map = pkgfile.parse(bytes, configFile.uri);
+        return new MapPackages(map);
+      } catch (e) {
+        printAndFail(
+            'Unable to read package config data from $packageConfigPath: $e');
+      }
+    }
+    return null;
+  }
+
+  void _processPlugins() {
+    List<Plugin> plugins = <Plugin>[];
+    plugins.addAll(AnalysisEngine.instance.requiredPlugins);
+    plugins.add(AnalysisEngine.instance.commandLinePlugin);
+    plugins.add(AnalysisEngine.instance.optionsPlugin);
+    ExtensionManager manager = new ExtensionManager();
+    manager.processPlugins(plugins);
+  }
+}
+
+class DriverOptions {
+  /// The maximum number of sources for which AST structures should be kept
+  /// in the cache.  The default is 512.
+  int cacheSize = 512;
+
+  /// The path to the dart SDK.
+  String dartSdkPath;
+
+  /// Whether to show lint warnings.
+  bool enableLints = true;
+
+  /// Whether to gather timing data during analysis.
+  bool enableTiming = false;
+
+  /// The path to a `.packages` configuration file
+  String packageConfigPath;
+
+  /// The path to the package root.
+  String packageRootPath;
+
+  /// Whether to show SDK warnings.
+  bool showSdkWarnings = false;
+
+  /// Whether to use Dart's Strong Mode analyzer.
+  bool strongMode = true;
+
+  /// The mock SDK (to speed up testing) or `null` to use the actual SDK.
+  DartSdk mockSdk;
+
+  /// Whether to show lints for the transitive closure of imported and exported
+  /// libraries.
+  bool visitTransitiveClosure = false;
+}
+
+/// Prints logging information comments to the [outSink] and error messages to
+/// [errorSink].
+class StdLogger extends Logger {
+  @override
+  void logError(String message, [exception]) => errorSink.writeln(message);
+  @override
+  void logInformation(String message, [exception]) => outSink.writeln(message);
+}