Fixed completion for method calls.

Initial support of Parameter Info (Ctrl+P) feature (including named parameters reordering).
Todo list:
1. Constructors are not working now (even primary constructor).
2. Tests.

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetSimpleNameExpression.java

@@ -23,6 +23,35 @@ public class JetSimpleNameExpression extends JetReferenceExpression {
         super(node);
     }
 
+    /**
+     * null if it's not a code expression
+     * @return receiver expression
+     */
+    @Nullable
+    public JetExpression getReceiverExpression() {
+        PsiElement parent = getParent();
+        if (parent instanceof JetQualifiedExpression && !isImportDirectiveExpression()) {
+            JetQualifiedExpression qualifiedExpression = (JetQualifiedExpression) parent;
+            return qualifiedExpression.getReceiverExpression();
+        } else if (parent instanceof JetCallExpression) {
+            //This is in case `a().b()`
+            JetCallExpression callExpression = (JetCallExpression) parent;
+            parent = callExpression.getParent();
+            if (parent instanceof JetQualifiedExpression) {
+                JetQualifiedExpression qualifiedExpression = (JetQualifiedExpression) parent;
+                return qualifiedExpression.getReceiverExpression();
+            }
+        }
+        return null;
+    }
+
+    public boolean isImportDirectiveExpression() {
+        PsiElement parent = getParent();
+        if (parent == null) return false;
+        else return parent instanceof JetImportDirective ||
+                    parent.getParent() instanceof JetImportDirective;
+    }
+
     @Nullable @IfNotParsed
     public String getReferencedName() {
         PsiElement referencedNameElement = getReferencedNameElement();

compiler/frontend/src/org/jetbrains/jet/lang/resolve/JetVisibilityChecker.java

@@ -12,7 +12,7 @@ public class JetVisibilityChecker {
      * @param subject the descriptor whose visibility is being checked
      * @return <code>true</code> iff subject is visible locationOwner
      */
-    public boolean isVisible(@NotNull DeclarationDescriptor locationOwner, @NotNull DeclarationDescriptor subject) {
+    public static boolean isVisible(@NotNull DeclarationDescriptor locationOwner, @NotNull DeclarationDescriptor subject) {
         // TODO : stub implementation
         return true;
     }

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/CallResolver.java

@@ -241,6 +241,7 @@ public class CallResolver {
 
         ResolutionDebugInfo.Data debugInfo = ResolutionDebugInfo.create();
         trace.record(ResolutionDebugInfo.RESOLUTION_DEBUG_INFO, call.getCallElement(), debugInfo);
+        trace.record(RESOLUTION_SCOPE, call.getCalleeExpression(), scope);
 
         debugInfo.set(ResolutionDebugInfo.TASKS, prioritizedTasks);
 

compiler/frontend/src/org/jetbrains/jet/lang/types/JetType.java

@@ -3,11 +3,13 @@ package org.jetbrains.jet.lang.types;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.lang.descriptors.annotations.Annotated;
 import org.jetbrains.jet.lang.resolve.scopes.JetScope;
+import org.jetbrains.jet.lang.types.checker.JetTypeChecker;
 
 import java.util.List;
 
 /**
  * @author abreslav
+ * @see JetTypeChecker#isSubtypeOf(JetType, JetType)
  */
 public interface JetType extends Annotated {
     @NotNull TypeConstructor getConstructor();