Implemented generic for loops

src/Evaluator/Iterator/SimpleKeyIterator.hpp

@@ -0,0 +1,39 @@
+
+#ifndef PORYGONLANG_SIMPLEKEYITERATOR_HPP
+#define PORYGONLANG_SIMPLEKEYITERATOR_HPP
+
+#include "Iterator.hpp"
+#include "../EvalValues/TableEvalValue.hpp"
+#include "../EvalValues/StringEvalValue.hpp"
+
+namespace Porygon::Evaluation{
+    class TableKeyIterator : public Iterator{
+        _Rb_tree_const_iterator<pair<const Utilities::HashedString, shared_ptr<EvalValue>>>  _iterator;
+        _Rb_tree_const_iterator<pair<const Utilities::HashedString, shared_ptr<EvalValue>>>  _end;
+        bool _hasStarted = false;
+    public:
+        explicit TableKeyIterator(const TableEvalValue* table)
+                : _iterator(table->GetTableIterator()), _end(table->GetTableIteratorEnd()){}
+
+        shared_ptr<EvalValue> GetCurrent() final{
+            return make_shared<StringEvalValue>(*_iterator->first.GetString());
+        }
+
+        bool MoveNext() final{
+            if (_hasStarted){
+                std::advance(_iterator, 1);
+            } else{
+                _hasStarted = true;
+            }
+            return _iterator != _end;
+        }
+
+        void Reset(){
+            throw EvaluationException("Can't reset table key iterator");
+        }
+    };
+}
+
+
+
+#endif //PORYGONLANG_SIMPLEKEYITERATOR_HPP