PorygonLang/src/Evaluator/EvalValues/StringEvalValue.hpp

#ifndef PORYGONLANG_STRINGEVALVALUE_HPP
#define PORYGONLANG_STRINGEVALVALUE_HPP

#include <string>
#include "EvalValue.hpp"
#include "../../Utilities/HashedString.hpp"

using namespace std;

namespace Porygon::Evaluation {
    class StringEvalValue : public EvalValue {
        u16string _value;
        size_t _hash;
    public:
        explicit StringEvalValue(u16string s) {
            _value = move(s);
            _hash = Utilities::HashedString::ConstHash(_value.c_str());
        }

        const TypeClass GetTypeClass() const final {
            return TypeClass::String;
        }

        const bool operator==(EvalValue *b) const final {
            if (b->GetTypeClass() != TypeClass::String)
                return false;
            return this->_hash == b->GetHashCode();
        };

        const u16string *EvaluateString() const final {
            return &_value;
        }

        const shared_ptr<EvalValue> Clone() const final {
            return make_shared<StringEvalValue>(_value);
        }

        const shared_ptr<EvalValue> IndexValue(EvalValue *val) const final {
            // Porygon is 1-indexed, so we convert to that.
            auto l = val->EvaluateInteger() - 1;
            return make_shared<StringEvalValue>(u16string(1, _value[l]));
        }

        const std::size_t GetHashCode() const final {
            return _hash;
        }
    };
}

#endif //PORYGONLANG_STRINGEVALVALUE_HPP