Move ChangeBuilder to analyzer_plugin

pkg/analyzer_plugin/test/support/abstract_context.dart

+// Copyright (c) 2017, 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:async';
+
+import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/visitor.dart';
+import 'package:analyzer/exception/exception.dart';
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/dart/analysis/byte_store.dart';
+import 'package:analyzer/src/dart/analysis/driver.dart';
+import 'package:analyzer/src/dart/analysis/file_state.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/engine.dart' as engine;
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+
+import 'mock_sdk.dart';
+
+/**
+ * Finds an [Element] with the given [name].
+ */
+Element findChildElement(Element root, String name, [ElementKind kind]) {
+  Element result = null;
+  root.accept(new _ElementVisitorFunctionWrapper((Element element) {
+    if (element.name != name) {
+      return;
+    }
+    if (kind != null && element.kind != kind) {
+      return;
+    }
+    result = element;
+  }));
+  return result;
+}
+
+/**
+ * A function to be called for every [Element].
+ */
+typedef void _ElementVisitorFunction(Element element);
+
+class AbstractContextTest {
+  MemoryResourceProvider provider;
+  DartSdk sdk;
+  Map<String, List<Folder>> packageMap;
+  UriResolver resourceResolver;
+
+  StringBuffer _logBuffer = new StringBuffer();
+  FileContentOverlay _fileContentOverlay = new FileContentOverlay();
+  AnalysisDriver _driver;
+
+  AnalysisDriver get driver => _driver;
+
+  Source addMetaPackageSource() => addPackageSource(
+      'meta',
+      'meta.dart',
+      r'''
+library meta;
+
+const Required required = const Required();
+
+class Required {
+  final String reason;
+  const Required([this.reason]);
+}
+''');
+
+  Source addPackageSource(String packageName, String filePath, String content) {
+    packageMap[packageName] = [(newFolder('/pubcache/$packageName'))];
+    File file = newFile('/pubcache/$packageName/$filePath', content);
+    return file.createSource();
+  }
+
+  Source addSource(String path, String content, [Uri uri]) {
+    driver.addFile(path);
+    driver.changeFile(path);
+    _fileContentOverlay[path] = content;
+    return null;
+  }
+
+  File newFile(String path, [String content]) =>
+      provider.newFile(provider.convertPath(path), content ?? '');
+
+  Folder newFolder(String path) =>
+      provider.newFolder(provider.convertPath(path));
+
+  void processRequiredPlugins() {
+    AnalysisEngine.instance.processRequiredPlugins();
+  }
+
+  Future<CompilationUnit> resolveLibraryUnit(Source source) async {
+    return (await driver.getResult(source.fullName))?.unit;
+  }
+
+  void setUp() {
+    processRequiredPlugins();
+    setupResourceProvider();
+    sdk = new MockSdk(resourceProvider: provider);
+    resourceResolver = new ResourceUriResolver(provider);
+    packageMap = new Map<String, List<Folder>>();
+    PackageMapUriResolver packageResolver =
+        new PackageMapUriResolver(provider, packageMap);
+    SourceFactory sourceFactory = new SourceFactory(
+        [new DartUriResolver(sdk), packageResolver, resourceResolver]);
+    PerformanceLog log = new PerformanceLog(_logBuffer);
+    AnalysisDriverScheduler scheduler = new AnalysisDriverScheduler(log);
+    _driver = new AnalysisDriver(
+        scheduler,
+        log,
+        provider,
+        new MemoryByteStore(),
+        _fileContentOverlay,
+        null,
+        sourceFactory,
+        new AnalysisOptionsImpl());
+    scheduler.start();
+    AnalysisEngine.instance.logger = PrintLogger.instance;
+  }
+
+  void setupResourceProvider() {
+    provider = new MemoryResourceProvider();
+  }
+
+  void tearDown() {
+    provider = null;
+    AnalysisEngine.instance.clearCaches();
+    AnalysisEngine.instance.logger = null;
+  }
+}
+
+/**
+ * Instances of the class [PrintLogger] print all of the errors.
+ */
+class PrintLogger implements Logger {
+  static final Logger instance = new PrintLogger();
+
+  @override
+  void logError(String message, [CaughtException exception]) {
+    print(message);
+    if (exception != null) {
+      print(exception);
+    }
+  }
+
+  @override
+  void logInformation(String message, [CaughtException exception]) {
+    print(message);
+    if (exception != null) {
+      print(exception);
+    }
+  }
+}
+
+/**
+ * Wraps the given [_ElementVisitorFunction] into an instance of
+ * [engine.GeneralizingElementVisitor].
+ */
+class _ElementVisitorFunctionWrapper extends GeneralizingElementVisitor {
+  final _ElementVisitorFunction function;
+
+  _ElementVisitorFunctionWrapper(this.function);
+
+  @override
+  visitElement(Element element) {
+    function(element);
+    super.visitElement(element);
+  }
+}