More fixes in the Fixes service.

pkg/analysis_services/lib/src/correction/fix.dart

+// Copyright (c) 2014, 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.
+
+library services.src.correction.fix;
+
+import 'package:analysis_services/correction/change.dart';
+import 'package:analysis_services/correction/fix.dart';
+import 'package:analysis_services/search/search_engine.dart';
+import 'package:analysis_services/src/correction/name_suggestion.dart';
+import 'package:analysis_services/src/correction/source_buffer.dart';
+import 'package:analysis_services/src/correction/source_range.dart' as rf;
+import 'package:analysis_services/src/correction/util.dart';
+import 'package:analyzer/src/generated/ast.dart';
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/java_core.dart';
+import 'package:analyzer/src/generated/parser.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart';
+
+
+/**
+ * The computer for Dart fixes.
+ */
+class FixProcessor {
+  final SearchEngine searchEngine;
+  final String file;
+  final CompilationUnit unit;
+  final AnalysisError error;
+
+  final List<Edit> edits = <Edit>[];
+  final Map<String, PositionGroup> positionGroups = <String, PositionGroup>{};
+  final List<Fix> fixes = <Fix>[];
+
+  CorrectionUtils utils;
+  int errorOffset;
+  int errorLength;
+  int errorEnd;
+  AstNode node;
+  AstNode coveredNode;
+
+
+  FixProcessor(this.searchEngine, this.file, this.unit, this.error);
+
+  List<Fix> compute() {
+    utils = new CorrectionUtils(unit);
+    errorOffset = error.offset;
+    errorLength = error.length;
+    errorEnd = errorOffset + errorLength;
+    node = new NodeLocator.con1(errorOffset).searchWithin(unit);
+    coveredNode = new NodeLocator.con2(
+        errorOffset,
+        errorOffset + errorLength).searchWithin(unit);
+    // analyze ErrorCode
+    ErrorCode errorCode = error.errorCode;
+    if (errorCode == StaticWarningCode.UNDEFINED_CLASS_BOOLEAN) {
+      _addFix_boolInsteadOfBoolean();
+    }
+    if (errorCode ==
+        CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE) {
+      _addFix_replaceWithConstInstanceCreation();
+    }
+    if (errorCode ==
+        CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_EXPLICIT) {
+      _addFix_createConstructorSuperExplicit();
+    }
+//    if (identical(
+//        errorCode,
+//        CompileTimeErrorCode.NO_DEFAULT_SUPER_CONSTRUCTOR_IMPLICIT)) {
+//      _addFix_createConstructorSuperImplicit();
+//    }
+    if (errorCode ==
+        CompileTimeErrorCode.UNDEFINED_CONSTRUCTOR_IN_INITIALIZER_DEFAULT) {
+      _addFix_createConstructorSuperExplicit();
+    }
+//    if (identical(errorCode, CompileTimeErrorCode.URI_DOES_NOT_EXIST)) {
+//      _addFix_createPart();
+//      _addFix_addPackageDependency();
+//    }
+    if (errorCode == HintCode.DIVISION_OPTIMIZATION) {
+      _addFix_useEffectiveIntegerDivision();
+    }
+    if (errorCode == HintCode.TYPE_CHECK_IS_NOT_NULL) {
+      _addFix_isNotNull();
+    }
+    if (errorCode == HintCode.TYPE_CHECK_IS_NULL) {
+      _addFix_isNull();
+    }
+    if (errorCode == HintCode.UNNECESSARY_CAST) {
+      _addFix_removeUnnecessaryCast();
+    }
+    if (errorCode == HintCode.UNUSED_IMPORT) {
+      _addFix_removeUnusedImport();
+    }
+    if (errorCode == ParserErrorCode.EXPECTED_TOKEN) {
+      _addFix_insertSemicolon();
+    }
+    if (errorCode == ParserErrorCode.GETTER_WITH_PARAMETERS) {
+      _addFix_removeParameters_inGetterDeclaration();
+    }
+    if (errorCode == StaticWarningCode.CONCRETE_CLASS_WITH_ABSTRACT_MEMBER) {
+      _addFix_makeEnclosingClassAbstract();
+    }
+    if (errorCode == StaticWarningCode.EXTRA_POSITIONAL_ARGUMENTS) {
+      _addFix_createConstructor_insteadOfSyntheticDefault();
+    }
+    if (errorCode == StaticWarningCode.NEW_WITH_UNDEFINED_CONSTRUCTOR) {
+      _addFix_createConstructor_named();
+    }
+    if (errorCode ==
+        StaticWarningCode.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_ONE ||
+        errorCode ==
+            StaticWarningCode.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_TWO ||
+        errorCode ==
+            StaticWarningCode.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_THREE ||
+        errorCode ==
+            StaticWarningCode.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_FOUR ||
+        errorCode ==
+            StaticWarningCode.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_FIVE_PLUS) {
+      // make class abstract
+      _addFix_makeEnclosingClassAbstract();
+      // implement methods
+      AnalysisErrorWithProperties errorWithProperties =
+          error as AnalysisErrorWithProperties;
+      Object property =
+          errorWithProperties.getProperty(ErrorProperty.UNIMPLEMENTED_METHODS);
+      List<ExecutableElement> missingOverrides =
+          property as List<ExecutableElement>;
+      _addFix_createMissingOverrides(missingOverrides);
+      _addFix_createNoSuchMethod();
+    }
+    if (errorCode == StaticWarningCode.UNDEFINED_CLASS) {
+      _addFix_importLibrary_withType();
+      _addFix_createClass();
+      _addFix_undefinedClass_useSimilar();
+    }
+//    if (identical(errorCode, StaticWarningCode.UNDEFINED_IDENTIFIER)) {
+//      _addFix_createFunction_forFunctionType();
+//      _addFix_importLibrary_withType();
+//      _addFix_importLibrary_withTopLevelVariable();
+//    }
+    if (errorCode == StaticTypeWarningCode.INSTANCE_ACCESS_TO_STATIC_MEMBER) {
+      _addFix_useStaticAccess_method();
+      _addFix_useStaticAccess_property();
+    }
+    if (errorCode == StaticTypeWarningCode.INVOCATION_OF_NON_FUNCTION) {
+      _addFix_removeParentheses_inGetterInvocation();
+    }
+//    if (identical(errorCode, StaticTypeWarningCode.UNDEFINED_FUNCTION)) {
+//      _addFix_importLibrary_withFunction();
+//      _addFix_undefinedFunction_useSimilar();
+//      _addFix_undefinedFunction_create();
+//    }
+//    if (identical(errorCode, StaticTypeWarningCode.UNDEFINED_GETTER)) {
+//      _addFix_createFunction_forFunctionType();
+//    }
+//    if (identical(errorCode, HintCode.UNDEFINED_METHOD) ||
+//        identical(errorCode, StaticTypeWarningCode.UNDEFINED_METHOD)) {
+//      _addFix_undefinedMethod_useSimilar();
+//      _addFix_undefinedMethod_create();
+//      _addFix_undefinedFunction_create();
+//    }
+    // done
+    return fixes;
+  }
+
+  void _addFix(FixKind kind, List args, {String fixFile}) {
+    if (fixFile == null) {
+      fixFile = file;
+    }
+    FileEdit fileEdit = new FileEdit(file);
+    edits.forEach((edit) => fileEdit.add(edit));
+    // prepare Change
+    String message = JavaString.format(kind.message, args);
+    Change change = new Change(message);
+    change.add(fileEdit);
+    positionGroups.values.forEach((group) => change.addPositionGroup(group));
+    // add Fix
+    Fix fix = new Fix(kind, change);
+    fixes.add(fix);
+  }
+
+  void _addFix_addPackageDependency() {
+    // TODO(scheglov) implement
+//    if (node is SimpleStringLiteral && node.parent is NamespaceDirective) {
+//      SimpleStringLiteral uriLiteral = node as SimpleStringLiteral;
+//      String uriString = uriLiteral.value;
+//      // we need package: import
+//      if (!uriString.startsWith("package:")) {
+//        return;
+//      }
+//      // prepare package name
+//      String packageName = StringUtils.removeStart(uriString, "package:");
+//      packageName = StringUtils.substringBefore(packageName, "/");
+//      // add proposal
+//      _proposals.add(
+//          new AddDependencyCorrectionProposal(
+//              _unitFile,
+//              packageName,
+//              FixKind.ADD_PACKAGE_DEPENDENCY,
+//              [packageName]));
+//    }
+  }
+
+  void _addFix_boolInsteadOfBoolean() {
+    SourceRange range = rf.rangeError(error);
+    _addReplaceEdit(range, "bool");
+    _addFix(FixKind.REPLACE_BOOLEAN_WITH_BOOL, []);
+  }
+
+
+  void _addFix_createClass() {
+    if (_mayBeTypeIdentifier(node)) {
+      String name = (node as SimpleIdentifier).name;
+      // prepare environment
+      String eol = utils.endOfLine;
+      CompilationUnitMember enclosingMember =
+          node.getAncestor((node) => node is CompilationUnitMember);
+      int offset = enclosingMember.end;
+      String prefix = "";
+      // prepare source
+      SourceBuilder sb = new SourceBuilder(file, offset);
+      {
+        sb.append("${eol}${eol}");
+        sb.append(prefix);
+        // "class"
+        sb.append("class ");
+        // append name
+        {
+          sb.startPosition("NAME");
+          sb.append(name);
+          sb.endPosition();
+        }
+        // no members
+        sb.append(" {");
+        sb.append(eol);
+        sb.append("}");
+      }
+      // insert source
+      _insertBuilder(sb);
+      _addLinkedPosition("NAME", rf.rangeNode(node));
+      // add proposal
+      _addFix(FixKind.CREATE_CLASS, [name]);
+    }
+  }
+
+
+  void _addFix_createConstructorSuperExplicit() {
+    ConstructorDeclaration targetConstructor =
+        node.parent as ConstructorDeclaration;
+    ClassDeclaration targetClassNode =
+        targetConstructor.parent as ClassDeclaration;
+    ClassElement targetClassElement = targetClassNode.element;
+    ClassElement superClassElement = targetClassElement.supertype.element;
+    // add proposals for all super constructors
+    List<ConstructorElement> superConstructors = superClassElement.constructors;
+    for (ConstructorElement superConstructor in superConstructors) {
+      String constructorName = superConstructor.name;
+      // skip private
+      if (Identifier.isPrivateName(constructorName)) {
+        continue;
+      }
+      // prepare SourceBuilder
+      SourceBuilder sb;
+      {
+        List<ConstructorInitializer> initializers =
+            targetConstructor.initializers;
+        if (initializers.isEmpty) {
+          int insertOffset = targetConstructor.parameters.end;
+          sb = new SourceBuilder(file, insertOffset);
+          sb.append(" : ");
+        } else {
+          ConstructorInitializer lastInitializer =
+              initializers[initializers.length - 1];
+          int insertOffset = lastInitializer.end;
+          sb = new SourceBuilder(file, insertOffset);
+          sb.append(", ");
+        }
+      }
+      // add super constructor name
+      sb.append("super");
+      if (!StringUtils.isEmpty(constructorName)) {
+        sb.append(".");
+        sb.append(constructorName);
+      }
+      // add arguments
+      sb.append("(");
+      bool firstParameter = true;
+      for (ParameterElement parameter in superConstructor.parameters) {
+        // skip non-required parameters
+        if (parameter.parameterKind != ParameterKind.REQUIRED) {
+          break;
+        }
+        // comma
+        if (firstParameter) {
+          firstParameter = false;
+        } else {
+          sb.append(", ");
+        }
+        // default value
+        DartType parameterType = parameter.type;
+        sb.startPosition(parameter.name);
+        sb.append(getDefaultValueCode(parameterType));
+        sb.endPosition();
+      }
+      sb.append(")");
+      // insert proposal
+      _insertBuilder(sb);
+      // add proposal
+      String proposalName = _getConstructorProposalName(superConstructor);
+      _addFix(FixKind.ADD_SUPER_CONSTRUCTOR_INVOCATION, [proposalName]);
+    }
+  }
+
+  void _addFix_createConstructorSuperImplicit() {
+    // TODO(scheglov) implement
+//    ClassDeclaration targetClassNode = node.parent as ClassDeclaration;
+//    ClassElement targetClassElement = targetClassNode.element;
+//    ClassElement superClassElement = targetClassElement.supertype.element;
+//    String targetClassName = targetClassElement.name;
+//    // add proposals for all super constructors
+//    List<ConstructorElement> superConstructors = superClassElement.constructors;
+//    for (ConstructorElement superConstructor in superConstructors) {
+//      String constructorName = superConstructor.name;
+//      // skip private
+//      if (Identifier.isPrivateName(constructorName)) {
+//        continue;
+//      }
+//      // prepare parameters and arguments
+//      JavaStringBuilder parametersBuffer = new JavaStringBuilder();
+//      JavaStringBuilder argumentsBuffer = new JavaStringBuilder();
+//      bool firstParameter = true;
+//      for (ParameterElement parameter in superConstructor.parameters) {
+//        // skip non-required parameters
+//        if (parameter.parameterKind != ParameterKind.REQUIRED) {
+//          break;
+//        }
+//        // comma
+//        if (firstParameter) {
+//          firstParameter = false;
+//        } else {
+//          parametersBuffer.append(", ");
+//          argumentsBuffer.append(", ");
+//        }
+//        // name
+//        String parameterName = parameter.displayName;
+//        if (parameterName.length > 1 && parameterName.startsWith("_")) {
+//          parameterName = parameterName.substring(1);
+//        }
+//        // parameter & argument
+//        _appendParameterSource(parametersBuffer, parameter.type, parameterName);
+//        argumentsBuffer.append(parameterName);
+//      }
+//      // add proposal
+//      String eol = utils.endOfLine;
+//      QuickFixProcessorImpl_NewConstructorLocation targetLocation =
+//          _prepareNewConstructorLocation(targetClassNode, eol);
+//      SourceBuilder sb = new SourceBuilder.con1(targetLocation._offset);
+//      {
+//        String indent = utils.getIndent(1);
+//        sb.append(targetLocation._prefix);
+//        sb.append(indent);
+//        sb.append(targetClassName);
+//        if (!constructorName.isEmpty) {
+//          sb.startPosition("NAME");
+//          sb.append(".");
+//          sb.append(constructorName);
+//          sb.endPosition();
+//        }
+//        sb.append("(");
+//        sb.append(parametersBuffer.toString());
+//        sb.append(") : super");
+//        if (!constructorName.isEmpty) {
+//          sb.append(".");
+//          sb.append(constructorName);
+//        }
+//        sb.append("(");
+//        sb.append(argumentsBuffer.toString());
+//        sb.append(");");
+//        sb.append(targetLocation._suffix);
+//      }
+//      _addInsertEdit3(sb);
+//      // add proposal
+//      String proposalName = _getConstructorProposalName(superConstructor);
+//      _addFix(
+//          FixKind.CREATE_CONSTRUCTOR_SUPER,
+//          [proposalName]);
+//    }
+  }
+
+  void _addFix_createConstructor_insteadOfSyntheticDefault() {
+    TypeName typeName = null;
+    ConstructorName constructorName = null;
+    InstanceCreationExpression instanceCreation = null;
+    if (node is SimpleIdentifier) {
+      if (node.parent is TypeName) {
+        typeName = node.parent as TypeName;
+        if (typeName.name == node && typeName.parent is ConstructorName) {
+          constructorName = typeName.parent as ConstructorName;
+          // should be synthetic default constructor
+          {
+            ConstructorElement constructorElement =
+                constructorName.staticElement;
+            if (constructorElement == null ||
+                !constructorElement.isDefaultConstructor ||
+                !constructorElement.isSynthetic) {
+              return;
+            }
+          }
+          // prepare InstanceCreationExpression
+          if (constructorName.parent is InstanceCreationExpression) {
+            instanceCreation = constructorName.parent as
+                InstanceCreationExpression;
+            if (instanceCreation.constructorName != constructorName) {
+              return;
+            }
+          }
+        }
+      }
+    }
+    // do we have enough information?
+    if (instanceCreation == null) {
+      return;
+    }
+    // prepare environment
+    String eol = utils.endOfLine;
+    // prepare target
+    DartType targetType = typeName.type;
+    if (targetType is! InterfaceType) {
+      return;
+    }
+    ClassElement targetElement = targetType.element as ClassElement;
+    String targetFile = targetElement.source.fullName;
+    ClassDeclaration targetClass = targetElement.node;
+    QuickFixProcessorImpl_NewConstructorLocation targetLocation =
+        _prepareNewConstructorLocation(targetClass, eol);
+    // build method source
+    SourceBuilder sb = new SourceBuilder(targetFile, targetLocation._offset);
+    {
+      String indent = "  ";
+      sb.append(targetLocation._prefix);
+      sb.append(indent);
+      sb.append(targetElement.name);
+      _addFix_undefinedMethod_create_parameters(
+          sb,
+          instanceCreation.argumentList);
+      sb.append(") {${eol}${indent}}");
+      sb.append(targetLocation._suffix);
+    }
+    // insert source
+    _insertBuilder(sb);
+    // add proposal
+    _addFix(FixKind.CREATE_CONSTRUCTOR, [constructorName], fixFile: targetFile);
+  }
+
+  void _addFix_createConstructor_named() {
+    SimpleIdentifier name = null;
+    ConstructorName constructorName = null;
+    InstanceCreationExpression instanceCreation = null;
+    if (node is SimpleIdentifier) {
+      // name
+      name = node as SimpleIdentifier;
+      if (name.parent is ConstructorName) {
+        constructorName = name.parent as ConstructorName;
+        if (constructorName.name == name) {
+          // Type.name
+          if (constructorName.parent is InstanceCreationExpression) {
+            instanceCreation = constructorName.parent as
+                InstanceCreationExpression;
+            // new Type.name()
+            if (instanceCreation.constructorName != constructorName) {
+              return;
+            }
+          }
+        }
+      }
+    }
+    // do we have enough information?
+    if (instanceCreation == null) {
+      return;
+    }
+    // prepare environment
+    String eol = utils.endOfLine;
+    // prepare target interface type
+    DartType targetType = constructorName.type.type;
+    if (targetType is! InterfaceType) {
+      return;
+    }
+    ClassElement targetElement = targetType.element as ClassElement;
+    String targetFile = targetElement.source.fullName;
+    ClassDeclaration targetClass = targetElement.node;
+    QuickFixProcessorImpl_NewConstructorLocation targetLocation =
+        _prepareNewConstructorLocation(targetClass, eol);
+    // build method source
+    SourceBuilder sb = new SourceBuilder(targetFile, targetLocation._offset);
+    {
+      String indent = "  ";
+      sb.append(targetLocation._prefix);
+      sb.append(indent);
+      sb.append(targetElement.name);
+      sb.append(".");
+      // append name
+      {
+        sb.startPosition("NAME");
+        sb.append(name.name);
+        sb.endPosition();
+      }
+      _addFix_undefinedMethod_create_parameters(
+          sb,
+          instanceCreation.argumentList);
+      sb.append(") {${eol}${indent}}");
+      sb.append(targetLocation._suffix);
+    }
+    // insert source
+    _insertBuilder(sb);
+    if (targetFile == file) {
+      _addLinkedPosition("NAME", rf.rangeNode(name));
+    }
+    // add proposal
+    _addFix(FixKind.CREATE_CONSTRUCTOR, [constructorName], fixFile: targetFile);
+  }
+
+  void _addFix_createFunction_forFunctionType() {
+    // TODO(scheglov) implement
+//    if (node is SimpleIdentifier) {
+//      SimpleIdentifier nameNode = node as SimpleIdentifier;
+//      // prepare argument expression (to get parameter)
+//      ClassElement targetElement;
+//      Expression argument;
+//      {
+//        Expression target = CorrectionUtils.getQualifiedPropertyTarget(node);
+//        if (target != null) {
+//          DartType targetType = target.bestType;
+//          if (targetType != null && targetType.element is ClassElement) {
+//            targetElement = targetType.element as ClassElement;
+//            argument = target.parent as Expression;
+//          } else {
+//            return;
+//          }
+//        } else {
+//          ClassDeclaration enclosingClass =
+//              node.getAncestor((node) => node is ClassDeclaration);
+//          targetElement = enclosingClass != null ?
+//              enclosingClass.element :
+//              null;
+//          argument = nameNode;
+//        }
+//      }
+//      // should be argument of some invocation
+//      ParameterElement parameterElement = argument.bestParameterElement;
+//      if (parameterElement == null) {
+//        return;
+//      }
+//      // should be parameter of function type
+//      DartType parameterType = parameterElement.type;
+//      if (parameterType is! FunctionType) {
+//        return;
+//      }
+//      FunctionType functionType = parameterType as FunctionType;
+//      // add proposal
+//      if (targetElement != null) {
+//        _addProposal_createFunction_method(targetElement, functionType);
+//      } else {
+//        _addProposal_createFunction_function(functionType);
+//      }
+//    }
+  }
+
+  void
+      _addFix_createMissingOverrides(List<ExecutableElement> missingOverrides) {
+    // TODO(scheglov) implement
+//    // sort by name
+//    missingOverrides.sort(
+//        (Element firstElement, Element secondElement) =>
+//            ObjectUtils.compare(firstElement.displayName, secondElement.displayName));
+//    // add elements
+//    ClassDeclaration targetClass = node.parent as ClassDeclaration;
+//    bool isFirst = true;
+//    for (ExecutableElement missingOverride in missingOverrides) {
+//      _addFix_createMissingOverrides_single(
+//          targetClass,
+//          missingOverride,
+//          isFirst);
+//      isFirst = false;
+//    }
+//    // add proposal
+//    _addFix(
+//        FixKind.CREATE_MISSING_OVERRIDES,
+//        [missingOverrides.length]);
+  }
+
+  void _addFix_createMissingOverrides_single(ClassDeclaration targetClass,
+      ExecutableElement missingOverride, bool isFirst) {
+    // TODO(scheglov) implement
+//    // prepare environment
+//    String eol = utils.endOfLine;
+//    String prefix = utils.getIndent(1);
+//    String prefix2 = utils.getIndent(2);
+//    int insertOffset = targetClass.end - 1;
+//    // prepare source
+//    JavaStringBuilder sb = new JavaStringBuilder();
+//    // may be empty line
+//    if (!isFirst || !targetClass.members.isEmpty) {
+//      sb.append(eol);
+//    }
+//    // may be property
+//    ElementKind elementKind = missingOverride.kind;
+//    bool isGetter = elementKind == ElementKind.GETTER;
+//    bool isSetter = elementKind == ElementKind.SETTER;
+//    bool isMethod = elementKind == ElementKind.METHOD;
+//    bool isOperator = isMethod && (missingOverride as MethodElement).isOperator;
+//    sb.append(prefix);
+//    if (isGetter) {
+//      sb.append("// TODO: implement ${missingOverride.displayName}");
+//      sb.append(eol);
+//      sb.append(prefix);
+//    }
+//    // @override
+//    {
+//      sb.append("@override");
+//      sb.append(eol);
+//      sb.append(prefix);
+//    }
+//    // return type
+//    _appendType(sb, missingOverride.type.returnType);
+//    if (isGetter) {
+//      sb.append("get ");
+//    } else if (isSetter) {
+//      sb.append("set ");
+//    } else if (isOperator) {
+//      sb.append("operator ");
+//    }
+//    // name
+//    sb.append(missingOverride.displayName);
+//    // parameters + body
+//    if (isGetter) {
+//      sb.append(" => null;");
+//    } else if (isMethod || isSetter) {
+//      List<ParameterElement> parameters = missingOverride.parameters;
+//      _appendParameters(sb, parameters);
+//      sb.append(" {");
+//      // TO-DO
+//      sb.append(eol);
+//      sb.append(prefix2);
+//      if (isMethod) {
+//        sb.append("// TODO: implement ${missingOverride.displayName}");
+//      } else {
+//        sb.append("// TODO: implement ${missingOverride.displayName}");
+//      }
+//      sb.append(eol);
+//      // close method
+//      sb.append(prefix);
+//      sb.append("}");
+//    }
+//    sb.append(eol);
+//    // done
+//    _addInsertEdit(insertOffset, sb.toString());
+//    // maybe set end range
+//    if (_endRange == null) {
+//      _endRange = SourceRangeFactory.rangeStartLength(insertOffset, 0);
+//    }
+  }
+
+  void _addFix_createNoSuchMethod() {
+    // TODO(scheglov) implement
+//    ClassDeclaration targetClass = node.parent as ClassDeclaration;
+//    // prepare environment
+//    String eol = utils.endOfLine;
+//    String prefix = utils.getIndent(1);
+//    int insertOffset = targetClass.end - 1;
+//    // prepare source
+//    SourceBuilder sb = new SourceBuilder.con1(insertOffset);
+//    {
+//      // insert empty line before existing member
+//      if (!targetClass.members.isEmpty) {
+//        sb.append(eol);
+//      }
+//      // append method
+//      sb.append(prefix);
+//      sb.append(
+//          "noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);");
+//      sb.append(eol);
+//    }
+//    // done
+//    _addInsertEdit3(sb);
+//    _endRange = SourceRangeFactory.rangeStartLength(insertOffset, 0);
+//    // add proposal
+//    _addFix(FixKind.CREATE_NO_SUCH_METHOD, []);
+  }
+
+  void _addFix_createPart() {
+    // TODO(scheglov) implement
+//    if (node is SimpleStringLiteral && node.parent is PartDirective) {
+//      SimpleStringLiteral uriLiteral = node as SimpleStringLiteral;
+//      String uriString = uriLiteral.value;
+//      // prepare referenced File
+//      JavaFile newFile;
+//      {
+//        Uri uri = parseUriWithException(uriString);
+//        if (uri.isAbsolute) {
+//          return;
+//        }
+//        newFile = new JavaFile.relative(_unitLibraryFolder, uriString);
+//      }
+//      if (!newFile.exists()) {
+//        // prepare new source
+//        String source;
+//        {
+//          String eol = utils.endOfLine;
+//          String libraryName = _unitLibraryElement.displayName;
+//          source = "part of ${libraryName};${eol}${eol}";
+//        }
+//        // add proposal
+//        _proposals.add(
+//            new CreateFileCorrectionProposal(
+//                newFile,
+//                source,
+//                FixKind.CREATE_PART,
+//                [uriString]));
+//      }
+//    }
+  }
+
+  void _addFix_importLibrary(FixKind kind, String importPath) {
+    // TODO(scheglov) implement
+//    CompilationUnitElement libraryUnitElement =
+//        _unitLibraryElement.definingCompilationUnit;
+//    CompilationUnit libraryUnit = libraryUnitElement.node;
+//    // prepare new import location
+//    int offset = 0;
+//    String prefix;
+//    String suffix;
+//    {
+//      String eol = utils.endOfLine;
+//      // if no directives
+//      prefix = "";
+//      suffix = eol;
+//      CorrectionUtils libraryUtils = new CorrectionUtils(libraryUnit);
+//      // after last directive in library
+//      for (Directive directive in libraryUnit.directives) {
+//        if (directive is LibraryDirective || directive is ImportDirective) {
+//          offset = directive.end;
+//          prefix = eol;
+//          suffix = "";
+//        }
+//      }
+//      // if still beginning of file, skip shebang and line comments
+//      if (offset == 0) {
+//        CorrectionUtils_InsertDesc desc = libraryUtils.insertDescTop;
+//        offset = desc.offset;
+//        prefix = desc.prefix;
+//        suffix = "${desc.suffix}${eol}";
+//      }
+//    }
+//    // insert new import
+//    String importSource = "${prefix}import '${importPath}';${suffix}";
+//    _addInsertEdit(offset, importSource);
+//    // add proposal
+//    _addUnitCorrectionProposal2(libraryUnitElement.source, kind, [importPath]);
+  }
+
+  void _addFix_importLibrary_withElement(String name, ElementKind kind) {
+    // TODO(scheglov) implement
+//    // ignore if private
+//    if (name.startsWith("_")) {
+//      return;
+//    }
+//    // may be there is an existing import, but it is with prefix and we don't use this prefix
+//    for (ImportElement imp in _unitLibraryElement.imports) {
+//      // prepare element
+//      LibraryElement libraryElement = imp.importedLibrary;
+//      Element element =
+//          CorrectionUtils.getExportedElement(libraryElement, name);
+//      if (element == null) {
+//        continue;
+//      }
+//      if (element is PropertyAccessorElement) {
+//        element = (element as PropertyAccessorElement).variable;
+//      }
+//      if (element.kind != kind) {
+//        continue;
+//      }
+//      // may be apply prefix
+//      PrefixElement prefix = imp.prefix;
+//      if (prefix != null) {
+//        SourceRange range = SourceRangeFactory.rangeStartLength(node, 0);
+//        _addReplaceEdit(range, "${prefix.displayName}.");
+//        _addFix(
+//            FixKind.IMPORT_LIBRARY_PREFIX,
+//            [libraryElement.displayName, prefix.displayName]);
+//        continue;
+//      }
+//      // may be update "show" directive
+//      List<NamespaceCombinator> combinators = imp.combinators;
+//      if (combinators.length == 1 && combinators[0] is ShowElementCombinator) {
+//        ShowElementCombinator showCombinator =
+//            combinators[0] as ShowElementCombinator;
+//        // prepare new set of names to show
+//        Set<String> showNames = new Set<String>();
+//        showNames.addAll(showCombinator.shownNames);
+//        showNames.add(name);
+//        // prepare library name - unit name or 'dart:name' for SDK library
+//        String libraryName = libraryElement.definingCompilationUnit.displayName;
+//        if (libraryElement.isInSdk) {
+//          libraryName = imp.uri;
+//        }
+//        // update library
+//        String newShowCode = "show ${StringUtils.join(showNames, ", ")}";
+//        // TODO(scheglov)
+//        _addReplaceEdit(
+//            SourceRangeFactory.rangeShowCombinator(showCombinator),
+//            newShowCode);
+//        _addUnitCorrectionProposal2(
+//            _unitLibraryElement.source,
+//            FixKind.IMPORT_LIBRARY_SHOW,
+//            [libraryName]);
+//        // we support only one import without prefix
+//        return;
+//      }
+//    }
+//    // check SDK libraries
+//    AnalysisContext context = _unitLibraryElement.context;
+//    {
+//      DartSdk sdk = context.sourceFactory.dartSdk;
+//      List<SdkLibrary> sdkLibraries = sdk.sdkLibraries;
+//      for (SdkLibrary sdkLibrary in sdkLibraries) {
+//        SourceFactory sdkSourceFactory = context.sourceFactory;
+//        String libraryUri = sdkLibrary.shortName;
+//        Source librarySource = sdkSourceFactory.resolveUri(null, libraryUri);
+//        // prepare LibraryElement
+//        LibraryElement libraryElement =
+//            context.getLibraryElement(librarySource);
+//        if (libraryElement == null) {
+//          continue;
+//        }
+//        // prepare exported Element
+//        Element element =
+//            CorrectionUtils.getExportedElement(libraryElement, name);
+//        if (element == null) {
+//          continue;
+//        }
+//        if (element is PropertyAccessorElement) {
+//          element = (element as PropertyAccessorElement).variable;
+//        }
+//        if (element.kind != kind) {
+//          continue;
+//        }
+//        // add import
+//        _addFix_importLibrary(FixKind.IMPORT_LIBRARY_SDK, libraryUri);
+//      }
+//    }
+//    // check project libraries
+//    {
+//      List<Source> librarySources = context.librarySources;
+//      for (Source librarySource in librarySources) {
+//        // we don't need SDK libraries here
+//        if (librarySource.isInSystemLibrary) {
+//          continue;
+//        }
+//        // prepare LibraryElement
+//        LibraryElement libraryElement =
+//            context.getLibraryElement(librarySource);
+//        if (libraryElement == null) {
+//          continue;
+//        }
+//        // prepare exported Element
+//        Element element =
+//            CorrectionUtils.getExportedElement(libraryElement, name);
+//        if (element == null) {
+//          continue;
+//        }
+//        if (element.kind != kind) {
+//          continue;
+//        }
+//        // prepare "library" file
+//        JavaFile libraryFile = getSourceFile(librarySource);
+//        if (libraryFile == null) {
+//          continue;
+//        }
+//        // may be "package:" URI
+//        {
+//          Uri libraryPackageUri = _findPackageUri(context, libraryFile);
+//          if (libraryPackageUri != null) {
+//            _addFix_importLibrary(
+//                FixKind.IMPORT_LIBRARY_PROJECT,
+//                libraryPackageUri.toString());
+//            continue;
+//          }
+//        }
+//        // relative URI
+//        String relative =
+//            URIUtils.computeRelativePath(
+//                _unitLibraryFolder.getAbsolutePath(),
+//                libraryFile.getAbsolutePath());
+//        _addFix_importLibrary(
+//            FixKind.IMPORT_LIBRARY_PROJECT,
+//            relative);
+//      }
+//    }
+  }
+
+  void _addFix_importLibrary_withFunction() {
+    // TODO(scheglov) implement
+//    if (node is SimpleIdentifier && node.parent is MethodInvocation) {
+//      MethodInvocation invocation = node.parent as MethodInvocation;
+//      if (invocation.realTarget == null &&
+//          identical(invocation.methodName, node)) {
+//        String name = (node as SimpleIdentifier).name;
+//        _addFix_importLibrary_withElement(name, ElementKind.FUNCTION);
+//      }
+//    }
+  }
+
+  void _addFix_importLibrary_withTopLevelVariable() {
+    // TODO(scheglov) implement
+//    if (node is SimpleIdentifier) {
+//      String name = (node as SimpleIdentifier).name;
+//      _addFix_importLibrary_withElement(name, ElementKind.TOP_LEVEL_VARIABLE);
+//    }
+  }
+
+  void _addFix_importLibrary_withType() {
+    // TODO(scheglov) implement
+//    if (_mayBeTypeIdentifier(node)) {
+//      String typeName = (node as SimpleIdentifier).name;
+//      _addFix_importLibrary_withElement(typeName, ElementKind.CLASS);
+//    }
+  }
+
+  void _addFix_insertSemicolon() {
+    if (error.message.contains("';'")) {
+      int insertOffset = error.offset + error.length;
+      _addInsertEdit(insertOffset, ";");
+      _addFix(FixKind.INSERT_SEMICOLON, []);
+    }
+  }
+
+  void _addFix_isNotNull() {
+    if (coveredNode is IsExpression) {
+      IsExpression isExpression = coveredNode as IsExpression;
+      _addReplaceEdit(
+          rf.rangeEndEnd(isExpression.expression, isExpression),
+          " != null");
+      _addFix(FixKind.USE_NOT_EQ_NULL, []);
+    }
+  }
+
+  void _addFix_isNull() {
+    if (coveredNode is IsExpression) {
+      IsExpression isExpression = coveredNode as IsExpression;
+      _addReplaceEdit(
+          rf.rangeEndEnd(isExpression.expression, isExpression),
+          " == null");
+      _addFix(FixKind.USE_EQ_EQ_NULL, []);
+    }
+  }
+
+  void _addFix_makeEnclosingClassAbstract() {
+    ClassDeclaration enclosingClass =
+        node.getAncestor((node) => node is ClassDeclaration);
+    String className = enclosingClass.name.name;
+    _addInsertEdit(enclosingClass.classKeyword.offset, "abstract ");
+    _addFix(FixKind.MAKE_CLASS_ABSTRACT, [className]);
+  }
+
+  void _addFix_removeParameters_inGetterDeclaration() {
+    if (node is SimpleIdentifier && node.parent is MethodDeclaration) {
+      MethodDeclaration method = node.parent as MethodDeclaration;
+      FunctionBody body = method.body;
+      if (method.name == node && body != null) {
+        _addReplaceEdit(rf.rangeEndStart(node, body), " ");
+        _addFix(FixKind.REMOVE_PARAMETERS_IN_GETTER_DECLARATION, []);
+      }
+    }
+  }
+
+  void _addFix_removeParentheses_inGetterInvocation() {
+    if (node is SimpleIdentifier && node.parent is MethodInvocation) {
+      MethodInvocation invocation = node.parent as MethodInvocation;
+      if (invocation.methodName == node && invocation.target != null) {
+        _addRemoveEdit(rf.rangeEndEnd(node, invocation));
+        _addFix(FixKind.REMOVE_PARENTHESIS_IN_GETTER_INVOCATION, []);
+      }
+    }
+  }
+
+  void _addFix_removeUnnecessaryCast() {
+    if (coveredNode is! AsExpression) {
+      return;
+    }
+    AsExpression asExpression = coveredNode as AsExpression;
+    Expression expression = asExpression.expression;
+    int expressionPrecedence = getExpressionPrecedence(expression);
+    // remove 'as T' from 'e as T'
+    _addRemoveEdit(rf.rangeEndEnd(expression, asExpression));
+    _removeEnclosingParentheses(asExpression, expressionPrecedence);
+    // done
+    _addFix(FixKind.REMOVE_UNNECASSARY_CAST, []);
+  }
+
+  void _addFix_removeUnusedImport() {
+    // prepare ImportDirective
+    ImportDirective importDirective =
+        node.getAncestor((node) => node is ImportDirective);
+    if (importDirective == null) {
+      return;
+    }
+    // remove the whole line with import
+    _addRemoveEdit(utils.getLinesRange(rf.rangeNode(importDirective)));
+    // done
+    _addFix(FixKind.REMOVE_UNUSED_IMPORT, []);
+  }
+
+  void _addFix_replaceWithConstInstanceCreation() {
+    if (coveredNode is InstanceCreationExpression) {
+      var instanceCreation = coveredNode as InstanceCreationExpression;
+      _addReplaceEdit(rf.rangeToken(instanceCreation.keyword), "const");
+      _addFix(FixKind.USE_CONST, []);
+    }
+  }
+
+  void _addFix_undefinedClass_useSimilar() {
+    // TODO(scheglov) implement
+//    if (_mayBeTypeIdentifier(node)) {
+//      String name = (node as SimpleIdentifier).name;
+//      QuickFixProcessorImpl_ClosestElementFinder finder =
+//          new QuickFixProcessorImpl_ClosestElementFinder(
+//              name,
+//              new Predicate_QuickFixProcessorImpl_addFix_undefinedClass_useSimilar());
+//      // find closest element
+//      {
+//        // elements of this library
+//        _unitLibraryElement.accept(
+//            new RecursiveElementVisitor_QuickFixProcessorImpl_addFix_undefinedClass_useSimilar(
+//                finder));
+//        // elements from imports
+//        for (ImportElement importElement in _unitLibraryElement.imports) {
+//          if (importElement.prefix == null) {
+//            Map<String, Element> namespace =
+//                CorrectionUtils.getImportNamespace(importElement);
+//            finder._update2(namespace.values);
+//          }
+//        }
+//      }
+//      // if we have close enough element, suggest to use it
+//      if (finder != null && finder._distance < 5) {
+//        String closestName = finder._element.name;
+//        _addReplaceEdit(SourceRangeFactory.rangeNode(node), closestName);
+//        // add proposal
+//        if (closestName != null) {
+//          _addFix(
+//              FixKind.CHANGE_TO,
+//              [closestName]);
+//        }
+//      }
+//    }
+  }
+
+  void _addFix_undefinedFunction_create() {
+    // TODO(scheglov) implement
+//    // should be the name of the invocation
+//    if (node is SimpleIdentifier && node.parent is MethodInvocation) {
+//    } else {
+//      return;
+//    }
+//    String name = (node as SimpleIdentifier).name;
+//    MethodInvocation invocation = node.parent as MethodInvocation;
+//    // function invocation has no target
+//    Expression target = invocation.realTarget;
+//    if (target != null) {
+//      return;
+//    }
+//    // prepare environment
+//    String eol = utils.endOfLine;
+//    int insertOffset;
+//    String sourcePrefix;
+//    AstNode enclosingMember =
+//        node.getAncestor((node) => node is CompilationUnitMember);
+//    insertOffset = enclosingMember.end;
+//    sourcePrefix = "${eol}${eol}";
+//    // build method source
+//    SourceBuilder sb = new SourceBuilder.con1(insertOffset);
+//    {
+//      sb.append(sourcePrefix);
+//      // may be return type
+//      {
+//        DartType type =
+//            _addFix_undefinedMethod_create_getReturnType(invocation);
+//        if (type != null) {
+//          String typeSource = utils.getTypeSource2(type);
+//          if (typeSource != "dynamic") {
+//            sb.startPosition("RETURN_TYPE");
+//            sb.append(typeSource);
+//            sb.endPosition();
+//            sb.append(" ");
+//          }
+//        }
+//      }
+//      // append name
+//      {
+//        sb.startPosition("NAME");
+//        sb.append(name);
+//        sb.endPosition();
+//      }
+//      _addFix_undefinedMethod_create_parameters(sb, invocation.argumentList);
+//      sb.append(") {${eol}}");
+//    }
+//    // insert source
+//    _addInsertEdit(insertOffset, sb.toString());
+//    // add linked positions
+//    _addLinkedPosition("NAME", sb, SourceRangeFactory.rangeNode(node));
+//    _addLinkedPositions(sb);
+//    // add proposal
+//    _addFix(FixKind.CREATE_FUNCTION, [name]);
+  }
+
+  void _addFix_undefinedFunction_useSimilar() {
+    // TODO(scheglov) implement
+//    if (node is SimpleIdentifier) {
+//      String name = (node as SimpleIdentifier).name;
+//      QuickFixProcessorImpl_ClosestElementFinder finder =
+//          new QuickFixProcessorImpl_ClosestElementFinder(
+//              name,
+//              new Predicate_QuickFixProcessorImpl_addFix_undefinedFunction_useSimilar());
+//      // this library
+//      _unitLibraryElement.accept(
+//          new RecursiveElementVisitor_QuickFixProcessorImpl_addFix_undefinedFunction_useSimilar(
+//              finder));
+//      // imports
+//      for (ImportElement importElement in _unitLibraryElement.imports) {
+//        if (importElement.prefix == null) {
+//          Map<String, Element> namespace =
+//              CorrectionUtils.getImportNamespace(importElement);
+//          finder._update2(namespace.values);
+//        }
+//      }
+//      // if we have close enough element, suggest to use it
+//      String closestName = null;
+//      if (finder != null && finder._distance < 5) {
+//        closestName = finder._element.name;
+//        _addReplaceEdit(SourceRangeFactory.rangeNode(node), closestName);
+//        _addFix(FixKind.CHANGE_TO, [closestName]);
+//      }
+//    }
+  }
+
+  void _addFix_undefinedMethod_create() {
+    // TODO(scheglov) implement
+//    if (node is SimpleIdentifier && node.parent is MethodInvocation) {
+//      String name = (node as SimpleIdentifier).name;
+//      MethodInvocation invocation = node.parent as MethodInvocation;
+//      // prepare environment
+//      String eol = utils.endOfLine;
+//      Source targetSource;
+//      String prefix;
+//      int insertOffset;
+//      String sourcePrefix;
+//      String sourceSuffix;
+//      bool staticModifier = false;
+//      Expression target = invocation.realTarget;
+//      if (target == null) {
+//        targetSource = _source;
+//        ClassMember enclosingMember =
+//            node.getAncestor((node) => node is ClassMember);
+//        staticModifier = _inStaticMemberContext2(enclosingMember);
+//        prefix = utils.getNodePrefix(enclosingMember);
+//        insertOffset = enclosingMember.end;
+//        sourcePrefix = "${eol}${prefix}${eol}";
+//        sourceSuffix = "";
+//      } else {
+//        // prepare target interface type
+//        DartType targetType = target.bestType;
+//        if (targetType is! InterfaceType) {
+//          return;
+//        }
+//        ClassElement targetElement = targetType.element as ClassElement;
+//        targetSource = targetElement.source;
+//        // may be static
+//        if (target is Identifier) {
+//          staticModifier = target.bestElement.kind == ElementKind.CLASS;
+//        }
+//        // prepare insert offset
+//        ClassDeclaration targetClass = targetElement.node;
+//        prefix = "  ";
+//        insertOffset = targetClass.end - 1;
+//        if (targetClass.members.isEmpty) {
+//          sourcePrefix = "";
+//        } else {
+//          sourcePrefix = "${prefix}${eol}";
+//        }
+//        sourceSuffix = eol;
+//      }
+//      // build method source
+//      SourceBuilder sb = new SourceBuilder.con1(insertOffset);
+//      {
+//        sb.append(sourcePrefix);
+//        sb.append(prefix);
+//        // may be "static"
+//        if (staticModifier) {
+//          sb.append("static ");
+//        }
+//        // may be return type
+//        {
+//          DartType type =
+//              _addFix_undefinedMethod_create_getReturnType(invocation);
+//          if (type != null) {
+//            String typeSource = utils.getTypeSource2(type);
+//            if (typeSource != "dynamic") {
+//              sb.startPosition("RETURN_TYPE");
+//              sb.append(typeSource);
+//              sb.endPosition();
+//              sb.append(" ");
+//            }
+//          }
+//        }
+//        // append name
+//        {
+//          sb.startPosition("NAME");
+//          sb.append(name);
+//          sb.endPosition();
+//        }
+//        _addFix_undefinedMethod_create_parameters(sb, invocation.argumentList);
+//        sb.append(") {${eol}${prefix}}");
+//        sb.append(sourceSuffix);
+//      }
+//      // insert source
+//      _addInsertEdit(insertOffset, sb.toString());
+//      // add linked positions
+//      if (targetSource == _source) {
+//        _addLinkedPosition("NAME", sb, SourceRangeFactory.rangeNode(node));
+//      }
+//      _addLinkedPositions(sb);
+//      // add proposal
+//      _addUnitCorrectionProposal2(
+//          targetSource,
+//          FixKind.CREATE_METHOD,
+//          [name]);
+//    }
+  }
+
+  /**
+   * @return the possible return [Type], may be <code>null</code> if can not be identified.
+   */
+  DartType
+      _addFix_undefinedMethod_create_getReturnType(MethodInvocation invocation) {
+    // TODO(scheglov) implement
+//    AstNode parent = invocation.parent;
+//    // myFunction();
+//    if (parent is ExpressionStatement) {
+//      return VoidTypeImpl.instance;
+//    }
+//    // return myFunction();
+//    if (parent is ReturnStatement) {
+//      ExecutableElement executable =
+//          CorrectionUtils.getEnclosingExecutableElement(invocation);
+//      return executable != null ? executable.returnType : null;
+//    }
+//    // int v = myFunction();
+//    if (parent is VariableDeclaration) {
+//      VariableDeclaration variableDeclaration = parent;
+//      if (identical(variableDeclaration.initializer, invocation)) {
+//        VariableElement variableElement = variableDeclaration.element;
+//        if (variableElement != null) {
+//          return variableElement.type;
+//        }
+//      }
+//    }
+//    // v = myFunction();
+//    if (parent is AssignmentExpression) {
+//      AssignmentExpression assignment = parent;
+//      if (identical(assignment.rightHandSide, invocation)) {
+//        if (assignment.operator.type == TokenType.EQ) {
+//          // v = myFunction();
+//          Expression lhs = assignment.leftHandSide;
+//          if (lhs != null) {
+//            return lhs.bestType;
+//          }
+//        } else {
+//          // v += myFunction();
+//          MethodElement method = assignment.bestElement;
+//          if (method != null) {
+//            List<ParameterElement> parameters = method.parameters;
+//            if (parameters.length == 1) {
+//              return parameters[0].type;
+//            }
+//          }
+//        }
+//      }
+//    }
+//    // v + myFunction();
+//    if (parent is BinaryExpression) {
+//      BinaryExpression binary = parent;
+//      MethodElement method = binary.bestElement;
+//      if (method != null) {
+//        if (identical(binary.rightOperand, invocation)) {
+//          List<ParameterElement> parameters = method.parameters;
+//          return parameters.length == 1 ? parameters[0].type : null;
+//        }
+//      }
+//    }
+//    // foo( myFunction() );
+//    if (parent is ArgumentList) {
+//      ParameterElement parameter = invocation.bestParameterElement;
+//      return parameter != null ? parameter.type : null;
+//    }
+//    // bool
+//    {
+//      // assert( myFunction() );
+//      if (parent is AssertStatement) {
+//        AssertStatement statement = parent;
+//        if (identical(statement.condition, invocation)) {
+//          return coreTypeBool;
+//        }
+//      }
+//      // if ( myFunction() ) {}
+//      if (parent is IfStatement) {
+//        IfStatement statement = parent;
+//        if (identical(statement.condition, invocation)) {
+//          return coreTypeBool;
+//        }
+//      }
+//      // while ( myFunction() ) {}
+//      if (parent is WhileStatement) {
+//        WhileStatement statement = parent;
+//        if (identical(statement.condition, invocation)) {
+//          return coreTypeBool;
+//        }
+//      }
+//      // do {} while ( myFunction() );
+//      if (parent is DoStatement) {
+//        DoStatement statement = parent;
+//        if (identical(statement.condition, invocation)) {
+//          return coreTypeBool;
+//        }
+//      }
+//      // !myFunction()
+//      if (parent is PrefixExpression) {
+//        PrefixExpression prefixExpression = parent;
+//        if (prefixExpression.operator.type == TokenType.BANG) {
+//          return coreTypeBool;
+//        }
+//      }
+//      // binary expression '&&' or '||'
+//      if (parent is BinaryExpression) {
+//        BinaryExpression binaryExpression = parent;
+//        TokenType operatorType = binaryExpression.operator.type;
+//        if (operatorType == TokenType.AMPERSAND_AMPERSAND ||
+//            operatorType == TokenType.BAR_BAR) {
+//          return coreTypeBool;
+//        }
+//      }
+//    }
+    // we don't know
+    return null;
+  }
+
+  void _addFix_undefinedMethod_create_parameters(SourceBuilder sb,
+      ArgumentList argumentList) {
+    // append parameters
+    sb.append("(");
+    Set<String> excluded = new Set();
+    List<Expression> arguments = argumentList.arguments;
+    for (int i = 0; i < arguments.length; i++) {
+      Expression argument = arguments[i];
+      // append separator
+      if (i != 0) {
+        sb.append(", ");
+      }
+      // append type name
+      DartType type = argument.bestType;
+      String typeSource = utils.getTypeSource2(type);
+      {
+        sb.startPosition("TYPE${i}");
+        sb.append(typeSource);
+        _addSuperTypeProposals(sb, new Set(), type);
+        sb.endPosition();
+      }
+      sb.append(" ");
+      // append parameter name
+      {
+        List<String> suggestions =
+            _getArgumentNameSuggestions(excluded, type, argument, i);
+        String favorite = suggestions[0];
+        excluded.add(favorite);
+        sb.startPosition("ARG${i}");
+        sb.append(favorite);
+        sb.addProposals(suggestions);
+        sb.endPosition();
+      }
+    }
+  }
+
+  void _addFix_undefinedMethod_useSimilar() {
+    // TODO(scheglov) implement
+//    if (node is SimpleIdentifier && node.parent is MethodInvocation) {
+//      MethodInvocation invocation = node.parent as MethodInvocation;
+//      String name = (node as SimpleIdentifier).name;
+//      QuickFixProcessorImpl_ClosestElementFinder finder =
+//          new QuickFixProcessorImpl_ClosestElementFinder(
+//              name,
+//              new Predicate_QuickFixProcessorImpl_addFix_undefinedMethod_useSimilar());
+//      // unqualified invocation
+//      Expression target = invocation.realTarget;
+//      if (target == null) {
+//        ClassDeclaration clazz =
+//            invocation.getAncestor((node) => node is ClassDeclaration);
+//        if (clazz != null) {
+//          ClassElement classElement = clazz.element;
+//          _updateFinderWithClassMembers(finder, classElement);
+//        }
+//      } else {
+//        DartType type = target.bestType;
+//        if (type is InterfaceType) {
+//          ClassElement classElement = type.element;
+//          _updateFinderWithClassMembers(finder, classElement);
+//        }
+//      }
+//      // if we have close enough element, suggest to use it
+//      String closestName = null;
+//      if (finder != null && finder._distance < 5) {
+//        closestName = finder._element.name;
+//        _addReplaceEdit(SourceRangeFactory.rangeNode(node), closestName);
+//        _addFix(FixKind.CHANGE_TO, [closestName]);
+//      }
+//    }
+  }
+
+  void _addFix_useEffectiveIntegerDivision() {
+    for (AstNode n = node; n != null; n = n.parent) {
+      if (n is MethodInvocation &&
+          n.offset == errorOffset &&
+          n.length == errorLength) {
+        MethodInvocation invocation = n as MethodInvocation;
+        Expression target = invocation.target;
+        while (target is ParenthesizedExpression) {
+          target = (target as ParenthesizedExpression).expression;
+        }
+        // replace "/" with "~/"
+        BinaryExpression binary = target as BinaryExpression;
+        _addReplaceEdit(rf.rangeToken(binary.operator), "~/");
+        // remove everything before and after
+        _addRemoveEdit(rf.rangeStartStart(invocation, binary.leftOperand));
+        _addRemoveEdit(rf.rangeEndEnd(binary.rightOperand, invocation));
+        // add proposal
+        _addFix(FixKind.USE_EFFECTIVE_INTEGER_DIVISION, []);
+        // done
+        break;
+      }
+    }
+  }
+
+  void _addFix_useStaticAccess_method() {
+    if (node is SimpleIdentifier && node.parent is MethodInvocation) {
+      MethodInvocation invocation = node.parent as MethodInvocation;
+      if (invocation.methodName == node) {
+        Expression target = invocation.target;
+        String targetType = utils.getTypeSource(target);
+        // replace "target" with class name
+        SourceRange range = rf.rangeNode(target);
+        _addReplaceEdit(range, targetType);
+        // add proposal
+        _addFix(FixKind.CHANGE_TO_STATIC_ACCESS, [targetType]);
+      }
+    }
+  }
+
+  void _addFix_useStaticAccess_property() {
+    if (node is SimpleIdentifier) {
+      if (node.parent is PrefixedIdentifier) {
+        PrefixedIdentifier prefixed = node.parent as PrefixedIdentifier;
+        if (prefixed.identifier == node) {
+          Expression target = prefixed.prefix;
+          String targetType = utils.getTypeSource(target);
+          // replace "target" with class name
+          SourceRange range = rf.rangeNode(target);
+          _addReplaceEdit(range, targetType);
+          // add proposal
+          _addFix(FixKind.CHANGE_TO_STATIC_ACCESS, [targetType]);
+        }
+      }
+    }
+  }
+
+  /**
+   * Adds a new [Edit] to [edits].
+   */
+  void _addInsertEdit(int offset, String text) {
+    Edit edit = new Edit(offset, 0, text);
+    edits.add(edit);
+  }
+
+  /**
+   * Adds a single linked position to [groupId].
+   */
+  void _addLinkedPosition(String groupId, SourceRange range) {
+    _addLinkedPosition2(
+        groupId,
+        new Position(file, range.offset, range.length));
+  }
+
+  /**
+   * Adds a single linked position to [groupId].
+   */
+  void _addLinkedPosition2(String groupId, Position position) {
+    PositionGroup group = positionGroups[groupId];
+    if (group == null) {
+      group = new PositionGroup(groupId);
+      positionGroups[groupId] = group;
+    }
+    group.add(position);
+  }
+
+  /**
+   * Adds a new [Edit] to [edits].
+   */
+  void _addRemoveEdit(SourceRange range) {
+    _addReplaceEdit(range, '');
+  }
+
+  /**
+   * Adds a new [Edit] to [edits].
+   */
+  void _addReplaceEdit(SourceRange range, String text) {
+    Edit edit = new Edit.range(range, text);
+    edits.add(edit);
+  }
+
+  void _appendParameterSource(StringBuffer sb, DartType type, String name) {
+    String parameterSource = utils.getParameterSource(type, name);
+    sb.write(parameterSource);
+  }
+
+  void _appendParameters(StringBuffer sb, List<ParameterElement> parameters,
+      Map<ParameterElement, String> defaultValueMap) {
+    sb.write("(");
+    bool firstParameter = true;
+    bool sawNamed = false;
+    bool sawPositional = false;
+    for (ParameterElement parameter in parameters) {
+      if (!firstParameter) {
+        sb.write(", ");
+      } else {
+        firstParameter = false;
+      }
+      // may be optional
+      ParameterKind parameterKind = parameter.parameterKind;
+      if (parameterKind == ParameterKind.NAMED) {
+        if (!sawNamed) {
+          sb.write("{");
+          sawNamed = true;
+        }
+      }
+      if (parameterKind == ParameterKind.POSITIONAL) {
+        if (!sawPositional) {
+          sb.write("[");
+          sawPositional = true;
+        }
+      }
+      // parameter
+      _appendParameterSource(sb, parameter.type, parameter.name);
+      // default value
+      if (defaultValueMap != null) {
+        String defaultSource = defaultValueMap[parameter];
+        if (defaultSource != null) {
+          if (sawPositional) {
+            sb.write(" = ");
+          } else {
+            sb.write(": ");
+          }
+          sb.write(defaultSource);
+        }
+      }
+    }
+    // close parameters
+    if (sawNamed) {
+      sb.write("}");
+    }
+    if (sawPositional) {
+      sb.write("]");
+    }
+    sb.write(")");
+  }
+
+//  void _addLinkedPositionProposal(String group,
+//      LinkedPositionProposal proposal) {
+//    List<LinkedPositionProposal> nodeProposals = linkedPositionProposals[group];
+//    if (nodeProposals == null) {
+//      nodeProposals = <LinkedPositionProposal>[];
+//      linkedPositionProposals[group] = nodeProposals;
+//    }
+//    nodeProposals.add(proposal);
+//  }
+
+  /**
+   * @return the string to display as the name of the given constructor in a proposal name.
+   */
+  String _getConstructorProposalName(ConstructorElement constructor) {
+    StringBuffer proposalNameBuffer = new StringBuffer();
+    proposalNameBuffer.write("super");
+    // may be named
+    String constructorName = constructor.displayName;
+    if (!constructorName.isEmpty) {
+      proposalNameBuffer.write(".");
+      proposalNameBuffer.write(constructorName);
+    }
+    // parameters
+    _appendParameters(proposalNameBuffer, constructor.parameters, null);
+    // done
+    return proposalNameBuffer.toString();
+  }
+
+  /**
+   * Inserts the given [SourceBuilder] at its offset.
+   */
+  void _insertBuilder(SourceBuilder builder) {
+    String text = builder.toString();
+    _addInsertEdit(builder.offset, text);
+    // add linked positions
+    builder.positionGroups.forEach((PositionGroup group) {
+      group.positions.forEach((Position position) {
+        _addLinkedPosition2(group.id, position);
+      });
+    });
+  }
+
+  QuickFixProcessorImpl_NewConstructorLocation
+      _prepareNewConstructorLocation(ClassDeclaration classDeclaration, String eol) {
+    List<ClassMember> members = classDeclaration.members;
+    // find the last field/constructor
+    ClassMember lastFieldOrConstructor = null;
+    for (ClassMember member in members) {
+      if (member is FieldDeclaration || member is ConstructorDeclaration) {
+        lastFieldOrConstructor = member;
+      } else {
+        break;
+      }
+    }
+    // after the field/constructor
+    if (lastFieldOrConstructor != null) {
+      return new QuickFixProcessorImpl_NewConstructorLocation(
+          "${eol}${eol}",
+          lastFieldOrConstructor.end,
+          "");
+    }
+    // at the beginning of the class
+    String suffix = members.isEmpty ? "" : eol;
+    return new QuickFixProcessorImpl_NewConstructorLocation(
+        eol,
+        classDeclaration.leftBracket.end,
+        suffix);
+  }
+
+  /**
+   * Removes any [ParenthesizedExpression] enclosing [expr].
+   *
+   * [exprPrecedence] - the effective precedence of [expr].
+   */
+  void _removeEnclosingParentheses(Expression expr, int exprPrecedence) {
+    while (expr.parent is ParenthesizedExpression) {
+      ParenthesizedExpression parenthesized =
+          expr.parent as ParenthesizedExpression;
+      if (getExpressionParentPrecedence(parenthesized) > exprPrecedence) {
+        break;
+      }
+      _addRemoveEdit(rf.rangeToken(parenthesized.leftParenthesis));
+      _addRemoveEdit(rf.rangeToken(parenthesized.rightParenthesis));
+      expr = parenthesized;
+    }
+  }
+
+  static void _addSuperTypeProposals(SourceBuilder sb,
+      Set<DartType> alreadyAdded, DartType type) {
+    if (type != null &&
+        !alreadyAdded.contains(type) &&
+        type.element is ClassElement) {
+      alreadyAdded.add(type);
+      ClassElement element = type.element as ClassElement;
+      sb.addProposal(element.name);
+      _addSuperTypeProposals(sb, alreadyAdded, element.supertype);
+      for (InterfaceType interfaceType in element.interfaces) {
+        _addSuperTypeProposals(sb, alreadyAdded, interfaceType);
+      }
+    }
+  }
+
+  /**
+   * @return the suggestions for given [Type] and [DartExpression], not empty.
+   */
+  static List<String> _getArgumentNameSuggestions(Set<String> excluded,
+      DartType type, Expression expression, int index) {
+    List<String> suggestions =
+        getVariableNameSuggestions2(type, expression, excluded);
+    if (suggestions.length != 0) {
+      return suggestions;
+    }
+    return <String>["arg${index}"];
+  }
+
+  /**
+   * Returns `true` if [node] is a type name.
+   */
+  static bool _mayBeTypeIdentifier(AstNode node) {
+    if (node is SimpleIdentifier) {
+      AstNode parent = node.parent;
+      if (parent is TypeName) {
+        return true;
+      }
+      if (parent is MethodInvocation) {
+        return parent.realTarget == node;
+      }
+      if (parent is PrefixedIdentifier) {
+        return parent.prefix == node;
+      }
+    }
+    return false;
+  }
+}
+
+
+/**
+ * Describes the location for a newly created [ConstructorDeclaration].
+ *
+ * TODO(scheglov) rename
+ */
+class QuickFixProcessorImpl_NewConstructorLocation {
+  final String _prefix;
+  final int _offset;
+  final String _suffix;
+
+  QuickFixProcessorImpl_NewConstructorLocation(this._prefix, this._offset,
+      this._suffix);
+}