Implements string evaluation and concat

src/Evaluator/EvalValues/StringEvalValue.hpp

@@ -0,0 +1,38 @@
+
+#ifndef PORYGONLANG_STRINGEVALVALUE_HPP
+#define PORYGONLANG_STRINGEVALVALUE_HPP
+
+#include <string>
+#include "EvalValue.hpp"
+
+using namespace std;
+
+class StringEvalValue : public EvalValue{
+    string _value;
+    ScriptType* _type;
+public:
+    explicit StringEvalValue(string s){
+        _value = move(s);
+        _type = new ScriptType(TypeClass::String);
+    }
+    ~StringEvalValue() final{
+        delete _type;
+    }
+
+    ScriptType* GetType() final{
+        return _type;
+    };
+    bool operator ==(EvalValue* b) final{
+        if (b->GetType()->GetClass() != TypeClass::String)
+            return false;
+        return this->_value == b->EvaluateString();
+    };
+
+    string EvaluateString() final{
+        return _value;
+    }
+
+};
+
+
+#endif //PORYGONLANG_STRINGEVALVALUE_HPP