Exemplo n.º 1
0
 Element InterpretSuperString_(SuperString str)
 {
     Element out = Nil();
     std::string const INPUT(str.Value());
     if (false == INPUT.empty())
     {
         StringHolder temp = str.GetStringHolder();
         out = SuperString(StringHolder(temp, 1, INPUT.size() - 1));
     }
     return out;
 }
Exemplo n.º 2
0
        Element Interpret_( Environment& 
                          , std::vector<Element> const& parms
                          , Element const&)
        {
            if (parms.size() != 3)
            {
                std::stringstream ss;
                ss << "subseq requires 3 arguments, a container/string and start/end values";
                return Error(ss.str());
            }             

            bool gotANumber1 = false;
            bool gotANumber2 = false;
            bool gotAContainer = false;
            bool gotAString = false;
            bool gotASuperString = false;

            Number N1 = CastToNumber(parms[1], gotANumber1);
            Number N2 = CastToNumber(parms[2], gotANumber2);
            Container C = CastToContainer(parms[0], gotAContainer);
            String S = CastToString(parms[0], gotAString);
            SuperString SS = CastToSuperString(parms[0], gotASuperString);
             
            if (gotANumber1 && gotANumber2 && (gotAContainer || gotAString || gotASuperString))
            {
                int index1 = N1.IntValue();
                int index2 = N2.IntValue();
 
                if (index1 < 0 || index2 < 0)
                {
                    std::stringstream ss;
                    ss << "subseq requires a positive range, received: " << index1 << " and " << index2;
                    return Error(ss.str());
                }

                if (gotAContainer)
                {
                    if (C.NumberOfElements() <= index1 && C.NumberOfElements() <= index2)
                    {
                         return Container();
                    }

                    std::vector<Element> elements;
                    C.RetrieveVector(elements);
                    elements.assign(elements.begin() + N1.IntValue(), elements.begin() + N2.IntValue());
                    Container out;
                    out.SetVector(elements);
                    return out;
                }
                if (gotAString)
                {
                    std::string value = S.Value();
                    if (index1 >= static_cast<int>(value.size()))
                    {
                         return String("");
                    }

                    value = value.substr(N1.IntValue(), N2.IntValue());
                    return String(value);
                }

                if (gotASuperString)
                {
                    StringHolder temp = SS.GetStringHolder();
                    return SuperString(StringHolder(temp, N1.IntValue(), N2.IntValue()));
                }

                return Error("Something unexpected happened in subseq");
            }
            else
            {
                std::stringstream ss;
                ss << "subseq requires 3 arguments, a container/string and start/end numeric values.\n"
                   << "Received: " << parms[0].ToString() << ", " << parms[1].ToString() << ", " << parms[2].ToString();
                return Error(ss.str());
            }
        }