@Nullable
  public static GrVariable findVariableAtCaret(final PsiFile file, final Editor editor, final int offset) {
    final int correctOffset = correctOffset(editor, offset);
    final PsiElement elementAtCaret = file.findElementAt(correctOffset);
    final GrVariable variable = PsiTreeUtil.getParentOfType(elementAtCaret, GrVariable.class);
    if (variable != null && variable.getNameIdentifierGroovy().getTextRange().contains(correctOffset)) return variable;
    return null;
  }
@Nullable
  public static GrVariable findVariableAtCaret(final PsiFile file, final Editor editor, final int offset)