`analyzer_cli` move to SDK.

pkg/analyzer_cli/lib/src/bootloader.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 analyzer_cli.src.bootloader;
+
+import 'dart:async';
+import 'dart:isolate';
+
+import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/source/analysis_options_provider.dart';
+import 'package:analyzer/src/context/context.dart';
+import 'package:analyzer/src/generated/engine.dart' as engine;
+import 'package:analyzer/src/plugin/plugin_configuration.dart';
+import 'package:analyzer_cli/src/driver.dart';
+import 'package:analyzer_cli/src/options.dart';
+import 'package:source_span/source_span.dart';
+import 'package:yaml/src/yaml_node.dart';
+
+const _analyzerPackageName = 'analyzer';
+
+/// Return non-null if there is a validation issue with this plugin.
+String validate(PluginInfo plugin) {
+  var missing = <String>[];
+  if (plugin.className == null) {
+    missing.add('class name');
+  }
+  if (plugin.libraryUri == null) {
+    missing.add('library uri');
+  }
+  if (missing.isEmpty) {
+    // All good.
+    return null;
+  }
+  return 'Plugin ${plugin.name} skipped, config missing: ${missing.join(", ")}';
+}
+
+List<PluginInfo> _validate(Iterable<PluginInfo> plugins) {
+  List<PluginInfo> validated = <PluginInfo>[];
+  plugins.forEach((PluginInfo plugin) {
+    String validation = validate(plugin);
+    if (validation != null) {
+      errorSink.writeln(validation);
+    } else {
+      validated.add(plugin);
+    }
+  });
+  return validated;
+}
+
+/// Source code assembler.
+class Assembler {
+  /// Plugins to configure.
+  final Iterable<PluginInfo> plugins;
+
+  /// Create an assembler for the given plugin [config].
+  Assembler(this.plugins);
+
+  /// A string enumerating required package `import`s.
+  String get enumerateImports =>
+      plugins.map((PluginInfo p) => "import '${p.libraryUri}';").join('\n');
+
+  /// A string listing initialized plugin instances.
+  String get pluginList =>
+      plugins.map((PluginInfo p) => 'new ${p.className}()').join(', ');
+
+  /// Create a file containing a `main()` suitable for loading in spawned
+  /// isolate.
+  String createMain() => _generateMain();
+
+  String _generateMain() => """
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// This code was auto-generated, is not intended to be edited, and is subject to
+// significant change. Please see the README file for more information.
+
+import 'package:analyzer_cli/src/driver.dart';
+
+$enumerateImports
+
+void main(List<String> args) {
+  var starter = new Driver();
+  starter.userDefinedPlugins = [$pluginList];
+  starter.start(args);
+}
+""";
+}
+
+/// Given environment information extracted from command-line `args`, creates a
+/// a loadable analyzer "image".
+class BootLoader {
+  /// Emits an error message to [errorSink] if plugin config can't be read.
+  static final ErrorHandler _pluginConfigErrorHandler = (Exception e) {
+    String details;
+    if (e is PluginConfigFormatException) {
+      details = e.message;
+      var node = e.yamlNode;
+      if (node is YamlNode) {
+        SourceLocation location = node.span.start;
+        details += ' (line ${location.line}, column ${location.column})';
+      }
+    } else {
+      details = e.toString();
+    }
+
+    errorSink.writeln('Plugin configuration skipped: $details');
+  };
+
+  /// Reads plugin config info from `.analysis_options`.
+  PluginConfigOptionsProcessor _pluginOptionsProcessor =
+      new PluginConfigOptionsProcessor(_pluginConfigErrorHandler);
+
+  /// Create a loadable analyzer image configured with plugins derived from
+  /// the given analyzer command-line `args`.
+  Image createImage(List<String> args) {
+    // Parse commandline options.
+    CommandLineOptions options = CommandLineOptions.parse(args);
+
+    // Process analysis options file (and notify all interested parties).
+    _processAnalysisOptions(options);
+
+    // TODO(pquitslund): Pass in .packages info
+    return new Image(_pluginOptionsProcessor.config,
+        args: args, packageRootPath: options.packageRootPath);
+  }
+
+  void _processAnalysisOptions(CommandLineOptions options) {
+    // Determine options file path.
+    var filePath = options.analysisOptionsFile ??
+        engine.AnalysisEngine.ANALYSIS_OPTIONS_FILE;
+    try {
+      var file = PhysicalResourceProvider.INSTANCE.getFile(filePath);
+      AnalysisOptionsProvider analysisOptionsProvider =
+          new AnalysisOptionsProvider();
+      Map<String, YamlNode> options =
+          analysisOptionsProvider.getOptionsFromFile(file);
+      //TODO(pq): thread in proper context.
+      var temporaryContext = new AnalysisContextImpl();
+      _pluginOptionsProcessor.optionsProcessed(temporaryContext, options);
+    } on Exception catch (e) {
+      _pluginOptionsProcessor.onError(e);
+    }
+  }
+}
+
+/// A loadable "image" of a a configured analyzer instance.
+class Image {
+  /// (Optional) package root path.
+  final String packageRootPath;
+
+  /// (Optional) package map.
+  final Map<String, Uri> packages;
+
+  /// (Optional) args to be passed on to the loaded main.
+  final List<String> args;
+
+  /// Plugin configuration.
+  final PluginConfig config;
+
+  /// Create an image with the given [config] and optionally [packages],
+  /// [packageRootPath], and command line [args].
+  Image(this.config, {this.packages, this.packageRootPath, this.args});
+
+  /// Load this image.
+  ///
+  /// Loading an image consists in assembling an analyzer `main()`, configured
+  /// to include the appropriate analyzer plugins as specified in
+  /// `.analyzer_options` which is then run in a spawned isolate.
+  Future load() {
+    List<PluginInfo> plugins = _validate(config.plugins);
+    String mainSource = new Assembler(plugins).createMain();
+
+    Completer completer = new Completer();
+    ReceivePort exitListener = new ReceivePort();
+    exitListener.listen((data) {
+      completer.complete();
+      exitListener.close();
+    });
+
+    Uri uri =
+        Uri.parse('data:application/dart;charset=utf-8,${Uri.encodeComponent(
+        mainSource)}');
+
+    // TODO(pquitslund): update once .packages are supported.
+    String packageRoot =
+        packageRootPath != null ? packageRootPath : './packages';
+    Uri packageUri = new Uri.file(packageRoot);
+
+    Isolate.spawnUri(uri, args, null /* msg */,
+        packageRoot: packageUri, onExit: exitListener.sendPort);
+
+    return completer.future;
+  }
+}