code: @Deprecated
      public final void reset()
      {
          // empty any old parenStack contents.
          // NOTE: this is not the most efficient way
          // to do this, but it's the easiest to write...
          while (stackIsNotEmpty()) {
              pop();
          }
          
          scriptStart = textStart;
          scriptLimit = textStart;
          scriptCode  = UScript.INVALID_CODE;
          parenSP     = -1;
          pushCount   =  0;
          fixupCount  =  0;
          
          textIndex = textStart;
      }
docs: Reset the iterator to the start of the text.
  
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android