Add optional and named parameters to FunctionType.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

 // Copyright (c) 2012, 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.
 
 part of resolution;
 
 abstract class TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   DartType getType(Node node);
@@ skipping 836 matching lines @@
         visitor.visit(node);
 
         element.isBeingResolved = false;
         element.isResolved = true;
       });
     });
   }
 
   FunctionType computeFunctionType(Element element,
                                    FunctionSignature signature) {
-    LinkBuilder<DartType> parameterTypes = new LinkBuilder<DartType>();
-    for (Link<Element> link = signature.requiredParameters;
-         !link.isEmpty;
-         link = link.tail) {
-       parameterTypes.addLast(link.head.computeType(compiler));
-       // TODO(karlklose): optional parameters.
+    var parameterTypes = new LinkBuilder<DartType>();
+    for (Element parameter in signature.requiredParameters) {
+       parameterTypes.addLast(parameter.computeType(compiler));
     }
-    return new FunctionType(signature.returnType,
-                            parameterTypes.toLink(),
-                            element);
+    var optionalParameterTypes = const Link<DartType>();
+    var namedParameters = const Link<SourceString>();
+    var namedParameterTypes = const Link<DartType>();
+    if (signature.optionalParametersAreNamed) {
+      var namedParametersBuilder = new LinkBuilder<SourceString>();
+      var namedParameterTypesBuilder = new LinkBuilder<DartType>();
+      for (Element parameter in signature.optionalParameters) {
+        namedParametersBuilder.addLast(parameter.name);
+        namedParameterTypesBuilder.addLast(parameter.computeType(compiler));
+      }
+      namedParameters = namedParametersBuilder.toLink();
+      namedParameterTypes = namedParametersBuilder.toLink();
+    } else {
+      var optionalParameterTypesBuilder = new LinkBuilder<DartType>();
+      for (Element parameter in signature.optionalParameters) {
+        optionalParameterTypesBuilder.addLast(parameter.computeType(compiler));
+      }
+      optionalParameterTypes = optionalParameterTypesBuilder.toLink();
+    }
+    return new FunctionType(element,
+        signature.returnType,
+        parameterTypes.toLink(),
+        optionalParameterTypes,
+        namedParameters,
+        namedParameterTypes);
   }
 
   void resolveMetadataAnnotation(PartialMetadataAnnotation annotation) {
     compiler.withCurrentElement(annotation.annotatedElement, () => measure(() {
       assert(annotation.resolutionState == STATE_NOT_STARTED);
       annotation.resolutionState = STATE_STARTED;
 
       Node node = annotation.parseNode(compiler);
       ResolverVisitor visitor =
           visitorFor(annotation.annotatedElement.enclosingElement);
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     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }