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

@@ -22,13 +22,10 @@ import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.JetNodeTypes;
-import org.jetbrains.jet.lexer.JetTokens;
 
 import java.util.List;
 
-import static org.jetbrains.jet.lexer.JetTokens.EQ;
-import static org.jetbrains.jet.lexer.JetTokens.VAL_KEYWORD;
-import static org.jetbrains.jet.lexer.JetTokens.VAR_KEYWORD;
+import static org.jetbrains.jet.lexer.JetTokens.*;
 
 public class JetMultiDeclaration extends JetDeclarationImpl {
     public JetMultiDeclaration(@NotNull ASTNode node) {
@@ -58,4 +55,9 @@ public class JetMultiDeclaration extends JetDeclarationImpl {
         }
         return PsiTreeUtil.getNextSiblingOfType(eqNode.getPsi(), JetExpression.class);
     }
+
+    @Nullable
+    public ASTNode getValOrVarNode() {
+        return getNode().findChildByType(TokenSet.create(VAL_KEYWORD, VAR_KEYWORD));
+    }
 }

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

@@ -197,11 +197,22 @@ public class JetPsiFactory {
     }
 
     public static JetModifierList createModifierList(Project project, JetKeywordToken modifier) {
-        String text = modifier.getValue() + " val x";
-        JetProperty property = createProperty(project, text);
+        return createModifierList(project, modifier.getValue());
+    }
+
+    public static JetModifierList createModifierList(Project project, String text) {
+        JetProperty property = createProperty(project, text + " val x");
         return property.getModifierList();
     }
 
+    @NotNull
+    public static JetAnnotation createAnnotation(Project project, String text) {
+        JetProperty property = createProperty(project, text + " val x");
+        JetModifierList modifierList = property.getModifierList();
+        assert modifierList != null;
+        return modifierList.getAnnotations().get(0);
+    }
+
     public static JetModifierList createConstructorModifierList(Project project, JetKeywordToken modifier) {
         JetClass aClass = createClass(project, "class C " + modifier.getValue() + " (){}");
         return aClass.getPrimaryConstructorModifierList();

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

@@ -1003,4 +1003,22 @@ public class JetPsiUtil {
 
         return new StringBuilder(inFileParent.getText()).insert(inFileParentOffset, "<caret>").toString();
     }
+
+    @Nullable
+    public static JetModifierList replaceModifierList(@NotNull JetModifierListOwner owner, @Nullable JetModifierList modifierList) {
+        JetModifierList oldModifierList = owner.getModifierList();
+        if (modifierList == null) {
+            if (oldModifierList != null) oldModifierList.delete();
+            return null;
+        }
+        else {
+            if (oldModifierList == null) {
+                PsiElement firstChild = owner.getFirstChild();
+                return (JetModifierList) owner.addBefore(modifierList, firstChild);
+            }
+            else {
+                return (JetModifierList) oldModifierList.replace(modifierList);
+            }
+        }
+    }
 }