Refactor: introduce JetReference, rename: JetPsiReference -> AbstractJetReference

Add resolveToDescriptors() to JetReference trait
Rewrite JetPsiReference to kotlin

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

@@ -18,6 +18,7 @@ package org.jetbrains.jet.lang.resolve;
 
 import com.google.common.collect.ImmutableMap;
 import com.intellij.psi.PsiElement;
+import jet.runtime.typeinfo.KotlinSignature;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.TestOnly;
@@ -92,6 +93,7 @@ public interface BindingContext {
     WritableSlice<JetElement, ConstraintSystemCompleter> CONSTRAINT_SYSTEM_COMPLETER = new BasicWritableSlice<JetElement, ConstraintSystemCompleter>(DO_NOTHING);
     WritableSlice<JetElement, Call> CALL = new BasicWritableSlice<JetElement, Call>(DO_NOTHING);
 
+    @KotlinSignature("val AMBIGUOUS_REFERENCE_TARGET: WritableSlice<JetReferenceExpression, Collection<DeclarationDescriptor>>")
     WritableSlice<JetReferenceExpression, Collection<? extends DeclarationDescriptor>> AMBIGUOUS_REFERENCE_TARGET =
             new BasicWritableSlice<JetReferenceExpression, Collection<? extends DeclarationDescriptor>>(DO_NOTHING);
 
@@ -235,6 +237,7 @@ public interface BindingContext {
             .setFurtherLookupSlices(DECLARATIONS_TO_DESCRIPTORS).build();
 
     WritableSlice<JetReferenceExpression, PsiElement> LABEL_TARGET = Slices.<JetReferenceExpression, PsiElement>sliceBuilder().build();
+    @KotlinSignature("val AMBIGUOUS_LABEL_TARGET: WritableSlice<JetReferenceExpression, Collection<PsiElement>>")
     WritableSlice<JetReferenceExpression, Collection<? extends PsiElement>> AMBIGUOUS_LABEL_TARGET =
             Slices.<JetReferenceExpression, Collection<? extends PsiElement>>sliceBuilder().build();
     WritableSlice<ValueParameterDescriptor, PropertyDescriptor> VALUE_PARAMETER_AS_PROPERTY =

compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/lightClassUtils.kt

@@ -43,7 +43,7 @@ import com.intellij.psi.PsiClass
 
 fun JetClassOrObject.toLightClass(): PsiClass? = LightClassUtil.getPsiClass(this)
 
-fun JetDeclaration.toLightElements(): List<PsiElement> =
+public fun JetDeclaration.toLightElements(): List<PsiElement> =
         when (this) {
             is JetClassOrObject -> Collections.singletonList(LightClassUtil.getPsiClass(this))
             is JetNamedFunction -> Collections.singletonList(LightClassUtil.getLightClassMethod(this))
@@ -59,7 +59,7 @@ fun JetDeclaration.toLightElements(): List<PsiElement> =
             else -> Collections.emptyList()
         }
 
-fun PsiElement.toLightMethods(): List<PsiMethod> =
+public fun PsiElement.toLightMethods(): List<PsiMethod> =
         when (this) {
             is JetNamedFunction -> Collections.singletonList(LightClassUtil.getLightClassMethod(this))
             is JetProperty -> LightClassUtil.getLightClassPropertyMethods(this).toList()
@@ -69,7 +69,7 @@ fun PsiElement.toLightMethods(): List<PsiMethod> =
             else -> Collections.emptyList()
         }
 
-fun PsiElement.getRepresentativeLightMethod(): PsiMethod? =
+public fun PsiElement.getRepresentativeLightMethod(): PsiMethod? =
         when (this) {
             is JetNamedFunction -> LightClassUtil.getLightClassMethod(this)
             is JetProperty -> LightClassUtil.getLightClassPropertyMethods(this).getGetter()
@@ -79,7 +79,7 @@ fun PsiElement.getRepresentativeLightMethod(): PsiMethod? =
             else -> null
         }
 
-fun JetParameter.toPsiParameter(): PsiParameter? {
+public fun JetParameter.toPsiParameter(): PsiParameter? {
     val paramList = getParentByType(javaClass<JetParameterList>())
     if (paramList == null) return null
 
@@ -100,7 +100,7 @@ fun JetParameter.toPsiParameter(): PsiParameter? {
     return method.getParameterList().getParameters()[lightParamIndex]
 }
 
-fun JetTypeParameter.toPsiTypeParameters(): List<PsiTypeParameter> {
+public fun JetTypeParameter.toPsiTypeParameters(): List<PsiTypeParameter> {
     val paramList = getParentByType(javaClass<JetTypeParameterList>())
     if (paramList == null) return Collections.emptyList()
 
@@ -112,8 +112,8 @@ fun JetTypeParameter.toPsiTypeParameters(): List<PsiTypeParameter> {
 }
 
 // Returns original declaration if given PsiElement is a Kotlin light element, and element itself otherwise
-val PsiElement.unwrapped: PsiElement?
+public val PsiElement.unwrapped: PsiElement?
     get() = if (this is KotlinLightElement<*, *>) origin else this
 
-val PsiElement.namedUnwrappedElement: PsiNamedElement?
+public val PsiElement.namedUnwrappedElement: PsiNamedElement?
     get() = unwrapped?.getParentByType(javaClass<PsiNamedElement>())