code: public JBBPNumericField findForFieldOffset(final int offset) {
      JBBPNumericField result = null;
      for (final Map.Entry<JBBPNamedFieldInfo, JBBPNumericField> f : fieldMap.entrySet()) {
        if (f.getKey().getFieldOffsetInCompiledBlock() == offset) {
          result = f.getValue();
          break;
        }
      }
      return result;
    }
docs: Find a registered field for its field offset in compiled script.
  
  @param offset the field offset
  @return found field or null if there is not any found for the offset