Move ElementBuilder and CompilationUnitBuilder into builder.dart.

pkg/analyzer/lib/src/dart/element/builder.dart

Index: pkg/analyzer/lib/src/dart/element/builder.dart
diff --git a/pkg/analyzer/lib/src/dart/element/builder.dart b/pkg/analyzer/lib/src/dart/element/builder.dart
index 3534a2aed4bd99f023e0d9ebeded4d3af1869668..df8f470bd3b63fc4e5ab07658bc6d494080ed499 100644
--- a/pkg/analyzer/lib/src/dart/element/builder.dart
+++ b/pkg/analyzer/lib/src/dart/element/builder.dart
@@ -9,12 +9,54 @@ import 'dart:collection';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
+import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/java_engine.dart';
+import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart';
+
+/**
+ * A `CompilationUnitBuilder` builds an element model for a single compilation
+ * unit.
+ */
+class CompilationUnitBuilder {
+  /**
+   * Build the compilation unit element for the given [source] based on the
+   * compilation [unit] associated with the source. Throw an AnalysisException
+   * if the element could not be built.  [librarySource] is the source for the
+   * containing library.
+   */
+  CompilationUnitElementImpl buildCompilationUnit(
+      Source source, CompilationUnit unit, Source librarySource) {
+    return PerformanceStatistics.resolve.makeCurrentWhile(() {
+      if (unit == null) {
+        return null;
+      }
+      ElementHolder holder = new ElementHolder();
+      ElementBuilder builder = new ElementBuilder(holder);
+      unit.accept(builder);
+      CompilationUnitElementImpl element =
+          new CompilationUnitElementImpl(source.shortName);
+      element.accessors = holder.accessors;
+      element.enums = holder.enums;
+      element.functions = holder.functions;
+      element.source = source;
+      element.librarySource = librarySource;
+      element.typeAliases = holder.typeAliases;
+      element.types = holder.types;
+      element.topLevelVariables = holder.topLevelVariables;
+      unit.element = element;
+      holder.validate();
+      return element;
+    });
+  }
+}
 
 /**
  * Instances of the class `DirectiveElementBuilder` build elements for top
@@ -230,6 +272,1048 @@ class DirectiveElementBuilder extends SimpleAstVisitor<Object> {
 }
 
 /**
+ * Instances of the class `ElementBuilder` traverse an AST structure and build the element
+ * model representing the AST structure.
+ */
+class ElementBuilder extends RecursiveAstVisitor<Object> {
+  /**
+   * The element holder associated with the element that is currently being built.
+   */
+  ElementHolder _currentHolder;
+
+  /**
+   * A flag indicating whether a variable declaration is in the context of a field declaration.
+   */
+  bool _inFieldContext = false;
+
+  /**
+   * A flag indicating whether a variable declaration is within the body of a method or function.
+   */
+  bool _inFunction = false;
+
+  /**
+   * A collection holding the elements defined in a class that need to have
+   * their function type fixed to take into account type parameters of the
+   * enclosing class, or `null` if we are not currently processing nodes within
+   * a class.
+   */
+  List<ExecutableElementImpl> _functionTypesToFix = null;
+
+  /**
+   * A table mapping field names to field elements for the fields defined in the current class, or
+   * `null` if we are not in the scope of a class.
+   */
+  HashMap<String, FieldElement> _fieldMap;
+
+  /**
+   * Initialize a newly created element builder to build the elements for a compilation unit.
+   *
+   * @param initialHolder the element holder associated with the compilation unit being built
+   */
+  ElementBuilder(ElementHolder initialHolder) {
+    _currentHolder = initialHolder;
+  }
+
+  @override
+  Object visitBlock(Block node) {
+    bool wasInField = _inFieldContext;
+    _inFieldContext = false;
+    try {
+      node.visitChildren(this);
+    } finally {
+      _inFieldContext = wasInField;
+    }
+    return null;
+  }
+
+  @override
+  Object visitCatchClause(CatchClause node) {
+    SimpleIdentifier exceptionParameter = node.exceptionParameter;
+    if (exceptionParameter != null) {
+      // exception
+      LocalVariableElementImpl exception =
+          new LocalVariableElementImpl.forNode(exceptionParameter);
+      if (node.exceptionType == null) {
+        exception.hasImplicitType = true;
+      }
+      _currentHolder.addLocalVariable(exception);
+      exceptionParameter.staticElement = exception;
+      // stack trace
+      SimpleIdentifier stackTraceParameter = node.stackTraceParameter;
+      if (stackTraceParameter != null) {
+        LocalVariableElementImpl stackTrace =
+            new LocalVariableElementImpl.forNode(stackTraceParameter);
+        _currentHolder.addLocalVariable(stackTrace);
+        stackTraceParameter.staticElement = stackTrace;
+      }
+    }
+    return super.visitCatchClause(node);
+  }
+
+  @override
+  Object visitClassDeclaration(ClassDeclaration node) {
+    ElementHolder holder = new ElementHolder();
+    _functionTypesToFix = new List<ExecutableElementImpl>();
+    //
+    // Process field declarations before constructors and methods so that field
+    // formal parameters can be correctly resolved to their fields.
+    //
+    ElementHolder previousHolder = _currentHolder;
+    _currentHolder = holder;
+    try {
+      List<ClassMember> nonFields = new List<ClassMember>();
+      node.visitChildren(
+          new _ElementBuilder_visitClassDeclaration(this, nonFields));
+      _buildFieldMap(holder.fieldsWithoutFlushing);
+      int count = nonFields.length;
+      for (int i = 0; i < count; i++) {
+        nonFields[i].accept(this);
+      }
+    } finally {
+      _currentHolder = previousHolder;
+    }
+    SimpleIdentifier className = node.name;
+    ClassElementImpl element = new ClassElementImpl.forNode(className);
+    List<TypeParameterElement> typeParameters = holder.typeParameters;
+    List<DartType> typeArguments = _createTypeParameterTypes(typeParameters);
+    InterfaceTypeImpl interfaceType = new InterfaceTypeImpl(element);
+    interfaceType.typeArguments = typeArguments;
+    element.type = interfaceType;
+    element.typeParameters = typeParameters;
+    _setDoc(element, node);
+    element.abstract = node.isAbstract;
+    element.accessors = holder.accessors;
+    List<ConstructorElement> constructors = holder.constructors;
+    if (constructors.isEmpty) {
+      constructors = _createDefaultConstructors(element);
+    }
+    element.constructors = constructors;
+    element.fields = holder.fields;
+    element.methods = holder.methods;
+    // Function types must be initialized after the enclosing element has been
+    // set, for them to pick up the type parameters.
+    for (ExecutableElementImpl e in _functionTypesToFix) {
+      e.type = new FunctionTypeImpl(e);
+    }
+    _functionTypesToFix = null;
+    _currentHolder.addType(element);
+    className.staticElement = element;
+    _fieldMap = null;
+    holder.validate();
+    return null;
+  }
+
+  /**
+   * Implementation of this method should be synchronized with
+   * [visitClassDeclaration].
+   */
+  void visitClassDeclarationIncrementally(ClassDeclaration node) {
+    //
+    // Process field declarations before constructors and methods so that field
+    // formal parameters can be correctly resolved to their fields.
+    //
+    ClassElement classElement = node.element;
+    _buildFieldMap(classElement.fields);
+  }
+
+  @override
+  Object visitClassTypeAlias(ClassTypeAlias node) {
+    ElementHolder holder = new ElementHolder();
+    _visitChildren(holder, node);
+    SimpleIdentifier className = node.name;
+    ClassElementImpl element = new ClassElementImpl.forNode(className);
+    element.abstract = node.abstractKeyword != null;
+    element.mixinApplication = true;
+    List<TypeParameterElement> typeParameters = holder.typeParameters;
+    element.typeParameters = typeParameters;
+    List<DartType> typeArguments = _createTypeParameterTypes(typeParameters);
+    InterfaceTypeImpl interfaceType = new InterfaceTypeImpl(element);
+    interfaceType.typeArguments = typeArguments;
+    element.type = interfaceType;
+    _setDoc(element, node);
+    _currentHolder.addType(element);
+    className.staticElement = element;
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitConstructorDeclaration(ConstructorDeclaration node) {
+    ElementHolder holder = new ElementHolder();
+    bool wasInFunction = _inFunction;
+    _inFunction = true;
+    try {
+      _visitChildren(holder, node);
+    } finally {
+      _inFunction = wasInFunction;
+    }
+    FunctionBody body = node.body;
+    SimpleIdentifier constructorName = node.name;
+    ConstructorElementImpl element =
+        new ConstructorElementImpl.forNode(constructorName);
+    _setDoc(element, node);
+    if (node.externalKeyword != null) {
+      element.external = true;
+    }
+    if (node.factoryKeyword != null) {
+      element.factory = true;
+    }
+    element.functions = holder.functions;
+    element.labels = holder.labels;
+    element.localVariables = holder.localVariables;
+    element.parameters = holder.parameters;
+    element.const2 = node.constKeyword != null;
+    if (body.isAsynchronous) {
+      element.asynchronous = true;
+    }
+    if (body.isGenerator) {
+      element.generator = true;
+    }
+    _currentHolder.addConstructor(element);
+    node.element = element;
+    if (constructorName == null) {
+      Identifier returnType = node.returnType;
+      if (returnType != null) {
+        element.nameOffset = returnType.offset;
+        element.nameEnd = returnType.end;
+      }
+    } else {
+      constructorName.staticElement = element;
+      element.periodOffset = node.period.offset;
+      element.nameEnd = constructorName.end;
+    }
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitDeclaredIdentifier(DeclaredIdentifier node) {
+    SimpleIdentifier variableName = node.identifier;
+    LocalVariableElementImpl element =
+        new LocalVariableElementImpl.forNode(variableName);
+    ForEachStatement statement = node.parent as ForEachStatement;
+    int declarationEnd = node.offset + node.length;
+    int statementEnd = statement.offset + statement.length;
+    element.setVisibleRange(declarationEnd, statementEnd - declarationEnd - 1);
+    element.const3 = node.isConst;
+    element.final2 = node.isFinal;
+    if (node.type == null) {
+      element.hasImplicitType = true;
+    }
+    _currentHolder.addLocalVariable(element);
+    variableName.staticElement = element;
+    return super.visitDeclaredIdentifier(node);
+  }
+
+  @override
+  Object visitDefaultFormalParameter(DefaultFormalParameter node) {
+    ElementHolder holder = new ElementHolder();
+    NormalFormalParameter normalParameter = node.parameter;
+    SimpleIdentifier parameterName = normalParameter.identifier;
+    ParameterElementImpl parameter;
+    if (normalParameter is FieldFormalParameter) {
+      parameter = new DefaultFieldFormalParameterElementImpl(parameterName);
+      FieldElement field =
+          _fieldMap == null ? null : _fieldMap[parameterName.name];
+      if (field != null) {
+        (parameter as DefaultFieldFormalParameterElementImpl).field = field;
+      }
+    } else {
+      parameter = new DefaultParameterElementImpl(parameterName);
+    }
+    parameter.const3 = node.isConst;
+    parameter.final2 = node.isFinal;
+    parameter.parameterKind = node.kind;
+    // set initializer, default value range
+    Expression defaultValue = node.defaultValue;
+    if (defaultValue != null) {
+      _visit(holder, defaultValue);
+      FunctionElementImpl initializer =
+          new FunctionElementImpl.forOffset(defaultValue.beginToken.offset);
+      initializer.functions = holder.functions;
+      initializer.labels = holder.labels;
+      initializer.localVariables = holder.localVariables;
+      initializer.parameters = holder.parameters;
+      initializer.synthetic = true;
+      parameter.initializer = initializer;
+      parameter.defaultValueCode = defaultValue.toSource();
+    }
+    // visible range
+    _setParameterVisibleRange(node, parameter);
+    if (normalParameter is SimpleFormalParameter &&
+        normalParameter.type == null) {
+      parameter.hasImplicitType = true;
+    }
+    _currentHolder.addParameter(parameter);
+    parameterName.staticElement = parameter;
+    normalParameter.accept(this);
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitEnumDeclaration(EnumDeclaration node) {
+    SimpleIdentifier enumName = node.name;
+    ClassElementImpl enumElement = new ClassElementImpl.forNode(enumName);
+    enumElement.enum2 = true;
+    _setDoc(enumElement, node);
+    InterfaceTypeImpl enumType = new InterfaceTypeImpl(enumElement);
+    enumElement.type = enumType;
+    // The equivalent code for enums in the spec shows a single constructor,
+    // but that constructor is not callable (since it is a compile-time error
+    // to subclass, mix-in, implement, or explicitly instantiate an enum).  So
+    // we represent this as having no constructors.
+    enumElement.constructors = ConstructorElement.EMPTY_LIST;
+    _currentHolder.addEnum(enumElement);
+    enumName.staticElement = enumElement;
+    return super.visitEnumDeclaration(node);
+  }
+
+  @override
+  Object visitFieldDeclaration(FieldDeclaration node) {
+    bool wasInField = _inFieldContext;
+    _inFieldContext = true;
+    try {
+      node.visitChildren(this);
+    } finally {
+      _inFieldContext = wasInField;
+    }
+    return null;
+  }
+
+  @override
+  Object visitFieldFormalParameter(FieldFormalParameter node) {
+    if (node.parent is! DefaultFormalParameter) {
+      SimpleIdentifier parameterName = node.identifier;
+      FieldElement field =
+          _fieldMap == null ? null : _fieldMap[parameterName.name];
+      FieldFormalParameterElementImpl parameter =
+          new FieldFormalParameterElementImpl(parameterName);
+      parameter.const3 = node.isConst;
+      parameter.final2 = node.isFinal;
+      parameter.parameterKind = node.kind;
+      if (field != null) {
+        parameter.field = field;
+      }
+      _currentHolder.addParameter(parameter);
+      parameterName.staticElement = parameter;
+    }
+    //
+    // The children of this parameter include any parameters defined on the type
+    // of this parameter.
+    //
+    ElementHolder holder = new ElementHolder();
+    _visitChildren(holder, node);
+    ParameterElementImpl element = node.element;
+    element.parameters = holder.parameters;
+    element.typeParameters = holder.typeParameters;
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitFunctionDeclaration(FunctionDeclaration node) {
+    FunctionExpression expression = node.functionExpression;
+    if (expression != null) {
+      ElementHolder holder = new ElementHolder();
+      bool wasInFunction = _inFunction;
+      _inFunction = true;
+      try {
+        _visitChildren(holder, node);
+      } finally {
+        _inFunction = wasInFunction;
+      }
+      FunctionBody body = expression.body;
+      Token property = node.propertyKeyword;
+      if (property == null || _inFunction) {
+        SimpleIdentifier functionName = node.name;
+        FunctionElementImpl element =
+            new FunctionElementImpl.forNode(functionName);
+        _setDoc(element, node);
+        if (node.externalKeyword != null) {
+          element.external = true;
+        }
+        element.functions = holder.functions;
+        element.labels = holder.labels;
+        element.localVariables = holder.localVariables;
+        element.parameters = holder.parameters;
+        element.typeParameters = holder.typeParameters;
+        if (body.isAsynchronous) {
+          element.asynchronous = true;
+        }
+        if (body.isGenerator) {
+          element.generator = true;
+        }
+        if (_inFunction) {
+          Block enclosingBlock = node.getAncestor((node) => node is Block);
+          if (enclosingBlock != null) {
+            int functionEnd = node.offset + node.length;
+            int blockEnd = enclosingBlock.offset + enclosingBlock.length;
+            element.setVisibleRange(functionEnd, blockEnd - functionEnd - 1);
+          }
+        }
+        if (node.returnType == null) {
+          element.hasImplicitReturnType = true;
+        }
+        _currentHolder.addFunction(element);
+        expression.element = element;
+        functionName.staticElement = element;
+      } else {
+        SimpleIdentifier propertyNameNode = node.name;
+        if (propertyNameNode == null) {
+          // TODO(brianwilkerson) Report this internal error.
+          return null;
+        }
+        String propertyName = propertyNameNode.name;
+        TopLevelVariableElementImpl variable = _currentHolder
+            .getTopLevelVariable(propertyName) as TopLevelVariableElementImpl;
+        if (variable == null) {
+          variable = new TopLevelVariableElementImpl(node.name.name, -1);
+          variable.final2 = true;
+          variable.synthetic = true;
+          _currentHolder.addTopLevelVariable(variable);
+        }
+        if (node.isGetter) {
+          PropertyAccessorElementImpl getter =
+              new PropertyAccessorElementImpl.forNode(propertyNameNode);
+          _setDoc(getter, node);
+          if (node.externalKeyword != null) {
+            getter.external = true;
+          }
+          getter.functions = holder.functions;
+          getter.labels = holder.labels;
+          getter.localVariables = holder.localVariables;
+          if (body.isAsynchronous) {
+            getter.asynchronous = true;
+          }
+          if (body.isGenerator) {
+            getter.generator = true;
+          }
+          getter.variable = variable;
+          getter.getter = true;
+          getter.static = true;
+          variable.getter = getter;
+          if (node.returnType == null) {
+            getter.hasImplicitReturnType = true;
+          }
+          _currentHolder.addAccessor(getter);
+          expression.element = getter;
+          propertyNameNode.staticElement = getter;
+        } else {
+          PropertyAccessorElementImpl setter =
+              new PropertyAccessorElementImpl.forNode(propertyNameNode);
+          _setDoc(setter, node);
+          if (node.externalKeyword != null) {
+            setter.external = true;
+          }
+          setter.functions = holder.functions;
+          setter.labels = holder.labels;
+          setter.localVariables = holder.localVariables;
+          setter.parameters = holder.parameters;
+          if (body.isAsynchronous) {
+            setter.asynchronous = true;
+          }
+          if (body.isGenerator) {
+            setter.generator = true;
+          }
+          setter.variable = variable;
+          setter.setter = true;
+          setter.static = true;
+          if (node.returnType == null) {
+            setter.hasImplicitReturnType = true;
+          }
+          variable.setter = setter;
+          variable.final2 = false;
+          _currentHolder.addAccessor(setter);
+          expression.element = setter;
+          propertyNameNode.staticElement = setter;
+        }
+      }
+      holder.validate();
+    }
+    return null;
+  }
+
+  @override
+  Object visitFunctionExpression(FunctionExpression node) {
+    if (node.parent is FunctionDeclaration) {
+      // visitFunctionDeclaration has already created the element for the
+      // declaration.  We just need to visit children.
+      return super.visitFunctionExpression(node);
+    }
+    ElementHolder holder = new ElementHolder();
+    bool wasInFunction = _inFunction;
+    _inFunction = true;
+    try {
+      _visitChildren(holder, node);
+    } finally {
+      _inFunction = wasInFunction;
+    }
+    FunctionBody body = node.body;
+    FunctionElementImpl element =
+        new FunctionElementImpl.forOffset(node.beginToken.offset);
+    element.functions = holder.functions;
+    element.labels = holder.labels;
+    element.localVariables = holder.localVariables;
+    element.parameters = holder.parameters;
+    element.typeParameters = holder.typeParameters;
+    if (body.isAsynchronous) {
+      element.asynchronous = true;
+    }
+    if (body.isGenerator) {
+      element.generator = true;
+    }
+    if (_inFunction) {
+      Block enclosingBlock = node.getAncestor((node) => node is Block);
+      if (enclosingBlock != null) {
+        int functionEnd = node.offset + node.length;
+        int blockEnd = enclosingBlock.offset + enclosingBlock.length;
+        element.setVisibleRange(functionEnd, blockEnd - functionEnd - 1);
+      }
+    }
+    if (_functionTypesToFix != null) {
+      _functionTypesToFix.add(element);
+    } else {
+      element.type = new FunctionTypeImpl(element);
+    }
+    element.hasImplicitReturnType = true;
+    _currentHolder.addFunction(element);
+    node.element = element;
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitFunctionTypeAlias(FunctionTypeAlias node) {
+    ElementHolder holder = new ElementHolder();
+    _visitChildren(holder, node);
+    SimpleIdentifier aliasName = node.name;
+    List<ParameterElement> parameters = holder.parameters;
+    List<TypeParameterElement> typeParameters = holder.typeParameters;
+    FunctionTypeAliasElementImpl element =
+        new FunctionTypeAliasElementImpl.forNode(aliasName);
+    _setDoc(element, node);
+    element.parameters = parameters;
+    element.typeParameters = typeParameters;
+    _createTypeParameterTypes(typeParameters);
+    element.type = new FunctionTypeImpl.forTypedef(element);
+    _currentHolder.addTypeAlias(element);
+    aliasName.staticElement = element;
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) {
+    if (node.parent is! DefaultFormalParameter) {
+      SimpleIdentifier parameterName = node.identifier;
+      ParameterElementImpl parameter =
+          new ParameterElementImpl.forNode(parameterName);
+      parameter.parameterKind = node.kind;
+      _setParameterVisibleRange(node, parameter);
+      _currentHolder.addParameter(parameter);
+      parameterName.staticElement = parameter;
+    }
+    //
+    // The children of this parameter include any parameters defined on the type
+    //of this parameter.
+    //
+    ElementHolder holder = new ElementHolder();
+    _visitChildren(holder, node);
+    ParameterElementImpl element = node.element;
+    element.parameters = holder.parameters;
+    element.typeParameters = holder.typeParameters;
+    holder.validate();
+    return null;
+  }
+
+  @override
+  Object visitLabeledStatement(LabeledStatement node) {
+    bool onSwitchStatement = node.statement is SwitchStatement;
+    for (Label label in node.labels) {
+      SimpleIdentifier labelName = label.label;
+      LabelElementImpl element =
+          new LabelElementImpl(labelName, onSwitchStatement, false);
+      _currentHolder.addLabel(element);
+      labelName.staticElement = element;
+    }
+    return super.visitLabeledStatement(node);
+  }
+
+  @override
+  Object visitMethodDeclaration(MethodDeclaration node) {
+    try {
+      ElementHolder holder = new ElementHolder();
+      bool wasInFunction = _inFunction;
+      _inFunction = true;
+      try {
+        _visitChildren(holder, node);
+      } finally {
+        _inFunction = wasInFunction;
+      }
+      bool isStatic = node.isStatic;
+      Token property = node.propertyKeyword;
+      FunctionBody body = node.body;
+      if (property == null) {
+        SimpleIdentifier methodName = node.name;
+        String nameOfMethod = methodName.name;
+        if (nameOfMethod == TokenType.MINUS.lexeme &&
+            node.parameters.parameters.length == 0) {
+          nameOfMethod = "unary-";
+        }
+        MethodElementImpl element =
+            new MethodElementImpl(nameOfMethod, methodName.offset);
+        _setDoc(element, node);
+        element.abstract = node.isAbstract;
+        if (node.externalKeyword != null) {
+          element.external = true;
+        }
+        element.functions = holder.functions;
+        element.labels = holder.labels;
+        element.localVariables = holder.localVariables;
+        element.parameters = holder.parameters;
+        element.static = isStatic;
+        element.typeParameters = holder.typeParameters;
+        if (body.isAsynchronous) {
+          element.asynchronous = true;
+        }
+        if (body.isGenerator) {
+          element.generator = true;
+        }
+        if (node.returnType == null) {
+          element.hasImplicitReturnType = true;
+        }
+        _currentHolder.addMethod(element);
+        methodName.staticElement = element;
+      } else {
+        SimpleIdentifier propertyNameNode = node.name;
+        String propertyName = propertyNameNode.name;
+        FieldElementImpl field =
+            _currentHolder.getField(propertyName) as FieldElementImpl;
+        if (field == null) {
+          field = new FieldElementImpl(node.name.name, -1);
+          field.final2 = true;
+          field.static = isStatic;
+          field.synthetic = true;
+          _currentHolder.addField(field);
+        }
+        if (node.isGetter) {
+          PropertyAccessorElementImpl getter =
+              new PropertyAccessorElementImpl.forNode(propertyNameNode);
+          _setDoc(getter, node);
+          if (node.externalKeyword != null) {
+            getter.external = true;
+          }
+          getter.functions = holder.functions;
+          getter.labels = holder.labels;
+          getter.localVariables = holder.localVariables;
+          if (body.isAsynchronous) {
+            getter.asynchronous = true;
+          }
+          if (body.isGenerator) {
+            getter.generator = true;
+          }
+          getter.variable = field;
+          getter.abstract = node.isAbstract;
+          getter.getter = true;
+          getter.static = isStatic;
+          field.getter = getter;
+          if (node.returnType == null) {
+            getter.hasImplicitReturnType = true;
+          }
+          _currentHolder.addAccessor(getter);
+          propertyNameNode.staticElement = getter;
+        } else {
+          PropertyAccessorElementImpl setter =
+              new PropertyAccessorElementImpl.forNode(propertyNameNode);
+          _setDoc(setter, node);
+          if (node.externalKeyword != null) {
+            setter.external = true;
+          }
+          setter.functions = holder.functions;
+          setter.labels = holder.labels;
+          setter.localVariables = holder.localVariables;
+          setter.parameters = holder.parameters;
+          if (body.isAsynchronous) {
+            setter.asynchronous = true;
+          }
+          if (body.isGenerator) {
+            setter.generator = true;
+          }
+          setter.variable = field;
+          setter.abstract = node.isAbstract;
+          setter.setter = true;
+          setter.static = isStatic;
+          if (node.returnType == null) {
+            setter.hasImplicitReturnType = true;
+          }
+          field.setter = setter;
+          field.final2 = false;
+          _currentHolder.addAccessor(setter);
+          propertyNameNode.staticElement = setter;
+        }
+      }
+      holder.validate();
+    } catch (exception, stackTrace) {
+      if (node.name.staticElement == null) {
+        ClassDeclaration classNode =
+            node.getAncestor((node) => node is ClassDeclaration);
+        StringBuffer buffer = new StringBuffer();
+        buffer.write("The element for the method ");
+        buffer.write(node.name);
+        buffer.write(" in ");
+        buffer.write(classNode.name);
+        buffer.write(" was not set while trying to build the element model.");
+        AnalysisEngine.instance.logger.logError(
+            buffer.toString(), new CaughtException(exception, stackTrace));
+      } else {
+        String message =
+            "Exception caught in ElementBuilder.visitMethodDeclaration()";
+        AnalysisEngine.instance.logger
+            .logError(message, new CaughtException(exception, stackTrace));
+      }
+    } finally {
+      if (node.name.staticElement == null) {
+        ClassDeclaration classNode =
+            node.getAncestor((node) => node is ClassDeclaration);
+        StringBuffer buffer = new StringBuffer();
+        buffer.write("The element for the method ");
+        buffer.write(node.name);
+        buffer.write(" in ");
+        buffer.write(classNode.name);
+        buffer.write(" was not set while trying to resolve types.");
+        AnalysisEngine.instance.logger.logError(
+            buffer.toString(),
+            new CaughtException(
+                new AnalysisException(buffer.toString()), null));
+      }
+    }
+    return null;
+  }
+
+  @override
+  Object visitSimpleFormalParameter(SimpleFormalParameter node) {
+    if (node.parent is! DefaultFormalParameter) {
+      SimpleIdentifier parameterName = node.identifier;
+      ParameterElementImpl parameter =
+          new ParameterElementImpl.forNode(parameterName);
+      parameter.const3 = node.isConst;
+      parameter.final2 = node.isFinal;
+      parameter.parameterKind = node.kind;
+      _setParameterVisibleRange(node, parameter);
+      if (node.type == null) {
+        parameter.hasImplicitType = true;
+      }
+      _currentHolder.addParameter(parameter);
+      parameterName.staticElement = parameter;
+    }
+    return super.visitSimpleFormalParameter(node);
+  }
+
+  @override
+  Object visitSwitchCase(SwitchCase node) {
+    for (Label label in node.labels) {
+      SimpleIdentifier labelName = label.label;
+      LabelElementImpl element = new LabelElementImpl(labelName, false, true);
+      _currentHolder.addLabel(element);
+      labelName.staticElement = element;
+    }
+    return super.visitSwitchCase(node);
+  }
+
+  @override
+  Object visitSwitchDefault(SwitchDefault node) {
+    for (Label label in node.labels) {
+      SimpleIdentifier labelName = label.label;
+      LabelElementImpl element = new LabelElementImpl(labelName, false, true);
+      _currentHolder.addLabel(element);
+      labelName.staticElement = element;
+    }
+    return super.visitSwitchDefault(node);
+  }
+
+  @override
+  Object visitTypeParameter(TypeParameter node) {
+    SimpleIdentifier parameterName = node.name;
+    TypeParameterElementImpl typeParameter =
+        new TypeParameterElementImpl.forNode(parameterName);
+    TypeParameterTypeImpl typeParameterType =
+        new TypeParameterTypeImpl(typeParameter);
+    typeParameter.type = typeParameterType;
+    _currentHolder.addTypeParameter(typeParameter);
+    parameterName.staticElement = typeParameter;
+    return super.visitTypeParameter(node);
+  }
+
+  @override
+  Object visitVariableDeclaration(VariableDeclaration node) {
+    bool isConst = node.isConst;
+    bool isFinal = node.isFinal;
+    bool hasInitializer = node.initializer != null;
+    VariableElementImpl element;
+    if (_inFieldContext) {
+      SimpleIdentifier fieldName = node.name;
+      FieldElementImpl field;
+      if ((isConst || isFinal) && hasInitializer) {
+        field = new ConstFieldElementImpl.forNode(fieldName);
+      } else {
+        field = new FieldElementImpl.forNode(fieldName);
+      }
+      element = field;
+      if (node.parent.parent is FieldDeclaration) {
+        _setDoc(element, node.parent.parent);
+      }
+      if ((node.parent as VariableDeclarationList).type == null) {
+        field.hasImplicitType = true;
+      }
+      _currentHolder.addField(field);
+      fieldName.staticElement = field;
+    } else if (_inFunction) {
+      SimpleIdentifier variableName = node.name;
+      LocalVariableElementImpl variable;
+      if (isConst && hasInitializer) {
+        variable = new ConstLocalVariableElementImpl.forNode(variableName);
+      } else {
+        variable = new LocalVariableElementImpl.forNode(variableName);
+      }
+      element = variable;
+      Block enclosingBlock = node.getAncestor((node) => node is Block);
+      // TODO(brianwilkerson) This isn't right for variables declared in a for
+      // loop.
+      variable.setVisibleRange(enclosingBlock.offset, enclosingBlock.length);
+      if ((node.parent as VariableDeclarationList).type == null) {
+        variable.hasImplicitType = true;
+      }
+      _currentHolder.addLocalVariable(variable);
+      variableName.staticElement = element;
+    } else {
+      SimpleIdentifier variableName = node.name;
+      TopLevelVariableElementImpl variable;
+      if (isConst && hasInitializer) {
+        variable = new ConstTopLevelVariableElementImpl.forNode(variableName);
+      } else {
+        variable = new TopLevelVariableElementImpl.forNode(variableName);
+      }
+      element = variable;
+      if (node.parent.parent is TopLevelVariableDeclaration) {
+        _setDoc(element, node.parent.parent);
+      }
+      if ((node.parent as VariableDeclarationList).type == null) {
+        variable.hasImplicitType = true;
+      }
+      _currentHolder.addTopLevelVariable(variable);
+      variableName.staticElement = element;
+    }
+    element.const3 = isConst;
+    element.final2 = isFinal;
+    if (hasInitializer) {
+      ElementHolder holder = new ElementHolder();
+      bool wasInFieldContext = _inFieldContext;
+      _inFieldContext = false;
+      try {
+        _visit(holder, node.initializer);
+      } finally {
+        _inFieldContext = wasInFieldContext;
+      }
+      FunctionElementImpl initializer =
+          new FunctionElementImpl.forOffset(node.initializer.beginToken.offset);
+      initializer.functions = holder.functions;
+      initializer.labels = holder.labels;
+      initializer.localVariables = holder.localVariables;
+      initializer.synthetic = true;
+      element.initializer = initializer;
+      holder.validate();
+    }
+    if (element is PropertyInducingElementImpl) {
+      if (_inFieldContext) {
+        (element as FieldElementImpl).static =
+            (node.parent.parent as FieldDeclaration).isStatic;
+      }
+      PropertyAccessorElementImpl getter =
+          new PropertyAccessorElementImpl.forVariable(element);
+      getter.getter = true;
+      if (element.hasImplicitType) {
+        getter.hasImplicitReturnType = true;
+      }
+      _currentHolder.addAccessor(getter);
+      element.getter = getter;
+      if (!isConst && !isFinal) {
+        PropertyAccessorElementImpl setter =
+            new PropertyAccessorElementImpl.forVariable(element);
+        setter.setter = true;
+        ParameterElementImpl parameter =
+            new ParameterElementImpl("_${element.name}", element.nameOffset);
+        parameter.synthetic = true;
+        parameter.parameterKind = ParameterKind.REQUIRED;
+        setter.parameters = <ParameterElement>[parameter];
+        _currentHolder.addAccessor(setter);
+        element.setter = setter;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Build the table mapping field names to field elements for the fields defined in the current
+   * class.
+   *
+   * @param fields the field elements defined in the current class
+   */
+  void _buildFieldMap(List<FieldElement> fields) {
+    _fieldMap = new HashMap<String, FieldElement>();
+    int count = fields.length;
+    for (int i = 0; i < count; i++) {
+      FieldElement field = fields[i];
+      _fieldMap[field.name] = field;
+    }
+  }
+
+  /**
+   * Creates the [ConstructorElement]s array with the single default constructor element.
+   *
+   * @param interfaceType the interface type for which to create a default constructor
+   * @return the [ConstructorElement]s array with the single default constructor element
+   */
+  List<ConstructorElement> _createDefaultConstructors(
+      ClassElementImpl definingClass) {
+    ConstructorElementImpl constructor =
+        new ConstructorElementImpl.forNode(null);
+    constructor.synthetic = true;
+    constructor.returnType = definingClass.type;
+    constructor.enclosingElement = definingClass;
+    constructor.type = new FunctionTypeImpl(constructor);
+    return <ConstructorElement>[constructor];
+  }
+
+  /**
+   * Create the types associated with the given type parameters, setting the type of each type
+   * parameter, and return an array of types corresponding to the given parameters.
+   *
+   * @param typeParameters the type parameters for which types are to be created
+   * @return an array of types corresponding to the given parameters
+   */
+  List<DartType> _createTypeParameterTypes(
+      List<TypeParameterElement> typeParameters) {
+    int typeParameterCount = typeParameters.length;
+    List<DartType> typeArguments = new List<DartType>(typeParameterCount);
+    for (int i = 0; i < typeParameterCount; i++) {
+      TypeParameterElementImpl typeParameter =
+          typeParameters[i] as TypeParameterElementImpl;
+      TypeParameterTypeImpl typeParameterType =
+          new TypeParameterTypeImpl(typeParameter);
+      typeParameter.type = typeParameterType;
+      typeArguments[i] = typeParameterType;
+    }
+    return typeArguments;
+  }
+
+  /**
+   * Return the body of the function that contains the given parameter, or `null` if no
+   * function body could be found.
+   *
+   * @param node the parameter contained in the function whose body is to be returned
+   * @return the body of the function that contains the given parameter
+   */
+  FunctionBody _getFunctionBody(FormalParameter node) {
+    AstNode parent = node.parent;
+    while (parent != null) {
+      if (parent is ConstructorDeclaration) {
+        return parent.body;
+      } else if (parent is FunctionExpression) {
+        return parent.body;
+      } else if (parent is MethodDeclaration) {
+        return parent.body;
+      }
+      parent = parent.parent;
+    }
+    return null;
+  }
+
+  /**
+   * If the given [node] has a documentation comment, remember its content
+   * and range into the given [element].
+   */
+  void _setDoc(ElementImpl element, AnnotatedNode node) {
+    Comment comment = node.documentationComment;
+    if (comment != null && comment.isDocumentation) {
+      element.documentationComment =
+          comment.tokens.map((Token t) => t.lexeme).join('\n');
+      element.setDocRange(comment.offset, comment.length);
+    }
+  }
+
+  /**
+   * Sets the visible source range for formal parameter.
+   */
+  void _setParameterVisibleRange(
+      FormalParameter node, ParameterElementImpl element) {
+    FunctionBody body = _getFunctionBody(node);
+    if (body != null) {
+      element.setVisibleRange(body.offset, body.length);
+    }
+  }
+
+  /**
+   * Make the given holder be the current holder while visiting the given node.
+   *
+   * @param holder the holder that will gather elements that are built while visiting the children
+   * @param node the node to be visited
+   */
+  void _visit(ElementHolder holder, AstNode node) {
+    if (node != null) {
+      ElementHolder previousHolder = _currentHolder;
+      _currentHolder = holder;
+      try {
+        node.accept(this);
+      } finally {
+        _currentHolder = previousHolder;
+      }
+    }
+  }
+
+  /**
+   * Make the given holder be the current holder while visiting the children of the given node.
+   *
+   * @param holder the holder that will gather elements that are built while visiting the children
+   * @param node the node whose children are to be visited
+   */
+  void _visitChildren(ElementHolder holder, AstNode node) {
+    if (node != null) {
+      ElementHolder previousHolder = _currentHolder;
+      _currentHolder = holder;
+      try {
+        node.visitChildren(this);
+      } finally {
+        _currentHolder = previousHolder;
+      }
+    }
+  }
+}
+
+class _ElementBuilder_visitClassDeclaration extends UnifyingAstVisitor<Object> {
+  final ElementBuilder builder;
+
+  List<ClassMember> nonFields;
+
+  _ElementBuilder_visitClassDeclaration(this.builder, this.nonFields) : super();
+
+  @override
+  Object visitConstructorDeclaration(ConstructorDeclaration node) {
+    nonFields.add(node);
+    return null;
+  }
+
+  @override
+  Object visitMethodDeclaration(MethodDeclaration node) {
+    nonFields.add(node);
+    return null;
+  }
+
+  @override
+  Object visitNode(AstNode node) => node.accept(builder);
+}
+
+/**
  * Instances of the class [_NamespaceCombinatorBuilder] can be used to visit
  * [Combinator] AST nodes and generate [NamespaceCombinator] elements.
  */