Analysis Options processing task and manager.

pkg/analyzer/lib/src/task/options.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.src.task.options;
+
+import 'package:analyzer/analyzer.dart';
+import 'package:analyzer/source/analysis_options_provider.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/task/general.dart';
+import 'package:analyzer/task/general.dart';
+import 'package:analyzer/task/model.dart';
+import 'package:source_span/source_span.dart';
+
+/// The errors produced while parsing `.analysis_options` files.
+///
+/// The list will be empty if there were no errors, but will not be `null`.
+final ListResultDescriptor<AnalysisError> ANALYSIS_OPTIONS_ERRORS =
+    new ListResultDescriptor<AnalysisError>(
+        'ANALYSIS_OPTIONS_ERRORS', AnalysisError.NO_ERRORS);
+
+/// A task that generates errors for an `.analysis_options` file.
+class GenerateOptionsErrorsTask extends SourceBasedAnalysisTask {
+  /// The name of the input whose value is the content of the file.
+  static const String CONTENT_INPUT_NAME = 'CONTENT_INPUT_NAME';
+
+  /// The task descriptor describing this kind of task.
+  static final TaskDescriptor DESCRIPTOR = new TaskDescriptor(
+      'GenerateOptionsErrorsTask',
+      createTask,
+      buildInputs,
+      <ResultDescriptor>[ANALYSIS_OPTIONS_ERRORS]);
+
+  final AnalysisOptionsProvider optionsProvider = new AnalysisOptionsProvider();
+
+  GenerateOptionsErrorsTask(AnalysisContext context, AnalysisTarget target)
+      : super(context, target);
+
+  @override
+  TaskDescriptor get descriptor => DESCRIPTOR;
+
+  Source get source => target.source;
+
+  @override
+  void internalPerform() {
+    String content = getRequiredInput(CONTENT_INPUT_NAME);
+
+    List<AnalysisError> errors = <AnalysisError>[];
+
+    try {
+      optionsProvider.getOptionsFromString(content);
+    } on OptionsFormatException catch (e) {
+      SourceSpan span = e.span;
+      var error = new AnalysisError(source, span.start.column + 1, span.length,
+          AnalysisOptionsErrorCode.PARSE_ERROR, [e.message]);
+      errors.add(error);
+    }
+
+    //
+    // Record outputs.
+    //
+    outputs[ANALYSIS_OPTIONS_ERRORS] = errors;
+  }
+
+  /// Return a map from the names of the inputs of this kind of task to the
+  /// task input descriptors describing those inputs for a task with the
+  /// given [target].
+  static Map<String, TaskInput> buildInputs(Source source) =>
+      <String, TaskInput>{CONTENT_INPUT_NAME: CONTENT.of(source)};
+
+  /// Create a task based on the given [target] in the given [context].
+  static GenerateOptionsErrorsTask createTask(
+          AnalysisContext context, AnalysisTarget target) =>
+      new GenerateOptionsErrorsTask(context, target);
+}