1 files changed, 81 insertions, 0 deletions
diff --git a/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/JavaSourceUtil.java b/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/JavaSourceUtil.java
index 8cf5b5bfbdd2..e2af7b08df0d 100644
--- a/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/JavaSourceUtil.java
+++ b/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/JavaSourceUtil.java
@@ -15,13 +15,28 @@
  */
 package com.intellij.psi.impl.source.tree;
 
+import com.intellij.lang.ASTFactory;
 import com.intellij.lang.ASTNode;
+import com.intellij.lang.LighterAST;
+import com.intellij.lang.LighterASTNode;
+import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.psi.*;
+import com.intellij.psi.codeStyle.CodeStyleManager;
+import com.intellij.psi.impl.source.DummyHolder;
 import com.intellij.psi.impl.source.SourceJavaCodeReference;
+import com.intellij.psi.impl.source.SourceTreeToPsiMap;
+import com.intellij.psi.tree.IElementType;
+import com.intellij.psi.tree.TokenSet;
 import com.intellij.util.CharTable;
+import com.intellij.util.IncorrectOperationException;
 import org.jetbrains.annotations.NotNull;
 
 public class JavaSourceUtil {
+  private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.tree.JavaSourceUtil");
+
+  private static final TokenSet REF_FILTER = TokenSet.orSet(
+    ElementType.JAVA_COMMENT_OR_WHITESPACE_BIT_SET, TokenSet.create(JavaElementType.ANNOTATION));
+
   private JavaSourceUtil() { }
 
   public static void fullyQualifyReference(@NotNull CompositeElement reference, @NotNull PsiClass targetClass) {
@@ -61,4 +76,70 @@ public class JavaSourceUtil {
       }
     }
   }
+
+  @NotNull
+  public static String getReferenceText(@NotNull PsiJavaCodeReferenceElement ref) {
+    final StringBuilder buffer = new StringBuilder();
+
+    ((TreeElement)ref.getNode()).acceptTree(new RecursiveTreeElementWalkingVisitor() {
+      @Override
+      public void visitLeaf(LeafElement leaf) {
+        if (!REF_FILTER.contains(leaf.getElementType())) {
+          String leafText = leaf.getText();
+          if (buffer.length() > 0 && !leafText.isEmpty() && Character.isJavaIdentifierPart(leafText.charAt(0))) {
+            char lastInBuffer = buffer.charAt(buffer.length() - 1);
+            if (lastInBuffer == '?' || Character.isJavaIdentifierPart(lastInBuffer)) {
+              buffer.append(" ");
+            }
+          }
+
+          buffer.append(leafText);
+        }
+      }
+
+      @Override
+      public void visitComposite(CompositeElement composite) {
+        if (!REF_FILTER.contains(composite.getElementType())) {
+          super.visitComposite(composite);
+        }
+      }
+    });
+
+    return buffer.toString();
+  }
+
+  @NotNull
+  public static String getReferenceText(@NotNull LighterAST tree, @NotNull LighterASTNode node) {
+    return LightTreeUtil.toFilteredString(tree, node, REF_FILTER);
+  }
+
+  public static TreeElement addParenthToReplacedChild(@NotNull IElementType parenthType,
+                                                      @NotNull TreeElement newChild,
+                                                      @NotNull PsiManager manager) {
+    CompositeElement parenthExpr = ASTFactory.composite(parenthType);
+
+    TreeElement dummyExpr = (TreeElement)newChild.clone();
+    final CharTable charTableByTree = SharedImplUtil.findCharTableByTree(newChild);
+    new DummyHolder(manager, parenthExpr, null, charTableByTree);
+    parenthExpr.putUserData(CharTable.CHAR_TABLE_KEY, charTableByTree);
+    parenthExpr.rawAddChildren(ASTFactory.leaf(JavaTokenType.LPARENTH, "("));
+    parenthExpr.rawAddChildren(dummyExpr);
+    parenthExpr.rawAddChildren(ASTFactory.leaf(JavaTokenType.RPARENTH, ")"));
+
+    try {
+      CodeStyleManager codeStyleManager = CodeStyleManager.getInstance(manager.getProject());
+      PsiElement formatted = codeStyleManager.reformat(SourceTreeToPsiMap.treeToPsiNotNull(parenthExpr));
+      parenthExpr = (CompositeElement)SourceTreeToPsiMap.psiToTreeNotNull(formatted);
+    }
+    catch (IncorrectOperationException e) {
+      LOG.error(e); // should not happen
+    }
+
+    newChild.putUserData(CharTable.CHAR_TABLE_KEY, SharedImplUtil.findCharTableByTree(newChild));
+    dummyExpr.getTreeParent().replaceChild(dummyExpr, newChild);
+
+    // TODO remove explicit caches drop since this should be ok if we will use ChangeUtil for the modification
+    TreeUtil.clearCaches(TreeUtil.getFileElement(parenthExpr));
+    return parenthExpr;
+  }
 }