@Override
  public Result calculateResult(Expression @NotNull [] params, final ExpressionContext context) {
    int templateStartOffset = context.getTemplateStartOffset();
    int offset = templateStartOffset > 0 ? context.getTemplateStartOffset() - 1 : context.getTemplateStartOffset();
    PsiElement place = context.getPsiElementAtStartOffset();
    PsiClass aClass = null;

    while(place != null){
      if (place instanceof PsiClass && !(place instanceof PsiAnonymousClass) && !(place instanceof PsiTypeParameter)){
        aClass = (PsiClass)place;
        // if className() is evaluated outside of the body of inner class, return name of its outer class instead (IDEADEV-19865)
        final PsiElement lBrace = aClass.getLBrace();
        if (lBrace != null && offset < lBrace.getTextOffset() && aClass.getContainingClass() != null) {
          aClass = aClass.getContainingClass();
        }
        break;
      }
      if (place instanceof PsiJavaFile){
        PsiClass[] classes = ((PsiJavaFile)place).getClasses();
        aClass = classes.length != 0 ? classes[0] : null;
        break;
      }
      place = place.getParent();
    }

    if (aClass == null) return null;
    String qname = aClass.getName();
    return qname == null ? null : new TextResult(qname);
  }
@Override
  public Result calculateResult(Expression @NotNull [] params, final ExpressionContext context)