Delete dart_backend from compiler.

pkg/compiler/lib/src/dart_backend/backend_ast_emitter.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.
-
-library backend_ast_emitter;
-
-import 'backend_ast_nodes.dart';
-import '../dart_types.dart';
-import '../elements/elements.dart';
-
-class TypeGenerator {
-  /// TODO(johnniwinther): Remove this when issue 21283 has been resolved.
-  static int pseudoNameCounter = 0;
-
-  static Parameter emitParameter(DartType type,
-      {String name, Element element}) {
-    if (name == null && element != null) {
-      name = element.name;
-    }
-    if (name == null) {
-      name = '_${pseudoNameCounter++}';
-    }
-    Parameter parameter;
-    if (type.isFunctionType) {
-      FunctionType functionType = type;
-      TypeAnnotation returnType = createOptionalType(functionType.returnType);
-      Parameters innerParameters = createParametersFromType(functionType);
-      parameter = new Parameter.function(name, returnType, innerParameters);
-    } else {
-      TypeAnnotation typeAnnotation = createOptionalType(type);
-      parameter = new Parameter(name, type: typeAnnotation);
-    }
-    parameter.element = element;
-    return parameter;
-  }
-
-  static Parameters createParametersFromType(FunctionType functionType) {
-    pseudoNameCounter = 0;
-    if (functionType.namedParameters.isEmpty) {
-      return new Parameters(createParameters(functionType.parameterTypes),
-          createParameters(functionType.optionalParameterTypes), false);
-    } else {
-      return new Parameters(
-          createParameters(functionType.parameterTypes),
-          createParameters(functionType.namedParameterTypes,
-              names: functionType.namedParameters),
-          true);
-    }
-  }
-
-  static List<Parameter> createParameters(Iterable<DartType> parameterTypes,
-      {Iterable<String> names: const <String>[],
-      Iterable<Element> elements: const <Element>[]}) {
-    Iterator<String> name = names.iterator;
-    Iterator<Element> element = elements.iterator;
-    return parameterTypes.map((DartType type) {
-      name.moveNext();
-      element.moveNext();
-      return emitParameter(type, name: name.current, element: element.current);
-    }).toList();
-  }
-
-  /// Like [createTypeAnnotation] except the dynamic type is converted to null.
-  static TypeAnnotation createOptionalType(DartType type) {
-    if (type.treatAsDynamic) {
-      return null;
-    } else {
-      return createType(type);
-    }
-  }
-
-  /// Creates the [TypeAnnotation] for a [type] that is not function type.
-  static TypeAnnotation createType(DartType type) {
-    if (type is GenericType) {
-      if (type.treatAsRaw) {
-        return new TypeAnnotation(type.element.name)..dartType = type;
-      }
-      return new TypeAnnotation(type.element.name,
-          type.typeArguments.map(createType).toList(growable: false))
-        ..dartType = type;
-    } else if (type is VoidType) {
-      return new TypeAnnotation('void')..dartType = type;
-    } else if (type is TypeVariableType) {
-      return new TypeAnnotation(type.name)..dartType = type;
-    } else if (type is DynamicType) {
-      return new TypeAnnotation("dynamic")..dartType = type;
-    } else if (type is MalformedType) {
-      return new TypeAnnotation(type.name)..dartType = type;
-    } else {
-      throw "Unsupported type annotation: $type";
-    }
-  }
-}