build_visitor first iteration

include/build_visitor.hpp

@@ -131,7 +131,7 @@ private:
 
   // Identifiers, constants, etc. -----------------
 
-  // // void Visit(AnyIdentifier* node) override; // std::string
+  void Visit(AnyIdentifier* node) override; // std::string
 
   void Visit(FloatNumberLiteral* node) override;
   void Visit(NumberLiteral* node) override;

include/interpreter_tree.hpp

@@ -480,7 +480,7 @@ struct LambdaFunction : public Node {
 
 struct NameSuperExpression : public Node {
   std::vector<TypeSubExpression> namespaces;
-  std::vector<NameSubSuperExpression> expressions; // last is not SuperExpression
+  std::vector<NameSubSuperExpression> expressions;
 };
 
 struct NameExpression : public Node {
@@ -511,13 +511,13 @@ struct TypeConstructor : public Node {
 };
 
 struct TupleType : public Node {
-  TypeIdentifierDefinition type; // optional
+  std::optional<TypeIdentifierDefinition> type;
-  std::vector<std::pair<NameIdentifier, AnyType>> entities; // NameIdentifier is optional
+  std::vector<std::pair<std::optional<NameIdentifier>, AnyType>> entities;
 };
 
 struct VariantType : public Node {
-  TypeIdentifierDefinition type; // optional
+  std::optional<TypeIdentifierDefinition> type;
-  std::vector<std::pair<TypeIdentifierDefinition, std::unique_ptr<TupleType>>> constructors;
+  std::vector<std::variant<TypeIdentifierDefinition, std::unique_ptr<TupleType>>> constructors;
 };
 
 struct AnnotatedType : public Node {

include/parse_token_types.hpp

@@ -118,6 +118,8 @@ const std::string TypeclassExpression = "typeclass_expression";
 
 // Identifiers, constants, etc. -----------------
 
+const std::string TypeIdentifierDefinition = "type_identifier_definition";
+
 const std::string TypeclassIdentifier = "typeclass_identifer";
 const std::string NameIdentifier = "name_identifier";
 const std::string TypeIdentifier = "type_identifer";

src/build_visitor.cpp

@@ -25,6 +25,7 @@ void BuildVisitor::Visit(SourceFile* node) {
         Visit(&std::get<Partition>(node->statements[i]));
       }
   }
+
   current_node_ = parse_node;
 }
 
@@ -38,6 +39,7 @@ void BuildVisitor::Visit(Sources* node) {
       current_node_ = parse_node.NthNamedChild(i);
       Visit(node->statements[i]);
   }
+
   current_node_ = parse_node;
 }
 
@@ -46,8 +48,7 @@ void BuildVisitor::Visit(Sources* node) {
 void BuildVisitor::Visit(Partition* node) {
   auto parse_node = current_node_;
 
-  auto name_node = parse_node.ChildByFieldName("name");
+  std::string name = parse_node.ChildByFieldName("name").GetValue();
-  std::string name = name_node.GetValue();
 
   if (name == "TEST") {
       node->type = Partition::Test;
@@ -113,8 +114,8 @@ void BuildVisitor::Visit(ImportStatement* node) {
   if (child_count > 1) {
     node->symbols.resize(child_count - 1);
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-        current_node_ = parse_node.NthNamedChild(i);
+        current_node_ = parse_node.NthNamedChild(i + 1);
         Visit(node->symbols[i]);
     }
   }
@@ -169,16 +170,15 @@ void BuildVisitor::Visit(VariableDefinition* node) {
 void BuildVisitor::Visit(FunctionDeclaration* node) {
   auto parse_node = current_node_;
 
-  auto name_node = parse_node.ChildByFieldName("name");
+  node->name = parse_node.ChildByFieldName("name").GetValue();
-  std::string name = name_node.GetValue();
 
   size_t child_count = parse_node.NamedChildCount();
 
   if (child_count > 1) {
     bool parameters_ended = false;
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-        current_node_ = parse_node.NthNamedChild(i);
+        current_node_ = parse_node.NthNamedChild(i + 1);
 
         if (current_node_.GetType() != parser::tokens::DefinitionParameter) {
           parameters_ended = true;
@@ -256,8 +256,8 @@ void BuildVisitor::Visit(TypeclassDefinition* node) {
   if (child_count > 1) {
     node->requirements.resize(child_count - 1, std::make_unique<FunctionDeclaration>());
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-        current_node_ = parse_node.NthNamedChild(i);
+        current_node_ = parse_node.NthNamedChild(i + 1);
         Visit(node->requirements[i].get());
     }
   }
@@ -339,8 +339,7 @@ void BuildVisitor::Visit(ImportSymbol& node) {
 void BuildVisitor::Visit(DefinedName* node) {
   auto parse_node = current_node_;
 
-  auto name_node = parse_node.ChildByFieldName("name"); // Operator or NameIdentifier
+  node->name = parse_node.ChildByFieldName("name").GetValue();
-  std::string name = name_node.GetValue();
 
   node->is_operator = (parse_node.NthChild(0).GetValue() == "("); // TODO
 
@@ -349,8 +348,8 @@ void BuildVisitor::Visit(DefinedName* node) {
   if (child_count > 1) {
     bool parameters_ended = false;
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-      current_node_ = parse_node.NthNamedChild(i);
+      current_node_ = parse_node.NthNamedChild(i + 1);
 
       if (current_node_.GetType() != parser::tokens::DefinitionParameter) {
         parameters_ended = true;
@@ -372,8 +371,7 @@ void BuildVisitor::Visit(DefinedName* node) {
 void BuildVisitor::Visit(DefinedAnnotatedName* node) {
   auto parse_node = current_node_;
 
-  auto name_node = parse_node.ChildByFieldName("name");
+  node->name = parse_node.ChildByFieldName("name").GetValue();
-  std::string name = name_node.GetValue();
 
   size_t child_count = parse_node.NamedChildCount();
 
@@ -405,8 +403,8 @@ void BuildVisitor::Visit(DefinedType* node) {
   if (child_count > 1) {
     bool parameters_ended = false;
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-      current_node_ = parse_node.NthNamedChild(i);
+      current_node_ = parse_node.NthNamedChild(i + 1);
 
       if (current_node_.GetType() != parser::tokens::DefinitionParameter) {
         parameters_ended = true;
@@ -437,8 +435,8 @@ void BuildVisitor::Visit(DefinedTypeclass* node) {
   if (child_count > 1) {
     bool parameters_ended = false;
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-      current_node_ = parse_node.NthNamedChild(i);
+      current_node_ = parse_node.NthNamedChild(i + 1);
 
       if (current_node_.GetType() != parser::tokens::DefinitionParameter) {
         parameters_ended = true;
@@ -460,16 +458,15 @@ void BuildVisitor::Visit(DefinedTypeclass* node) {
 void BuildVisitor::Visit(DefinitionParameter* node) {
   auto parse_node = current_node_;
 
-  auto name_node = parse_node.ChildByFieldName("type");
+  node->type = parse_node.ChildByFieldName("type").GetValue();
-  std::string name = name_node.GetValue();
 
   size_t child_count = parse_node.NamedChildCount();
 
   if (child_count > 1) {
     node->typeclasses.resize(child_count - 1, std::make_unique<ParametrizedTypeclass>());
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-        current_node_ = parse_node.NthNamedChild(i);
+        current_node_ = parse_node.NthNamedChild(i + 1);
         Visit(node->typeclasses[i].get());
         // choose between typeclass_expression and parametrized_typeclass
     }
@@ -481,16 +478,15 @@ void BuildVisitor::Visit(DefinitionParameter* node) {
 void BuildVisitor::Visit(DefinitionArgument* node) {
   auto parse_node = current_node_;
 
-  auto name_node = parse_node.ChildByFieldName("name");
+  node->name = parse_node.ChildByFieldName("name").GetValue();
-  std::string name = name_node.GetValue();
 
   size_t child_count = parse_node.NamedChildCount();
 
   if (child_count > 1) {
     node->types.resize(child_count - 1, std::make_unique<ParametrizedType>());
 
-    for (size_t i = 1; i < child_count; ++i) {
+    for (size_t i = 0; i < child_count - 1; ++i) {
-        current_node_ = parse_node.NthNamedChild(i);
+        current_node_ = parse_node.NthNamedChild(i + 1);
         Visit(node->types[i].get());
         // choose between type_expression and parametrized_type
     }
@@ -565,8 +561,8 @@ void BuildVisitor::Visit(Match* node) {
   // if (child_count > 1) { // always true (repeat1)
   node->matches.resize(child_count - 1);
 
-  for (size_t i = 1; i < child_count; ++i) {
+  for (size_t i = 0; i < child_count - 1; ++i) {
-      current_node_ = parse_node.NthNamedChild(i);
+      current_node_ = parse_node.NthNamedChild(i + 1);
       Visit(&node->matches[i]);
   }
   // }
@@ -905,8 +901,8 @@ void BuildVisitor::Visit(FunctionCallExpression* node) {
   // if (child_count > 1) { // always true (repeat1)
   node->arguments.resize(child_count - 1);
 
-  for (size_t i = 1; i < child_count; ++i) {
+  for (size_t i = 0; i < child_count - 1; ++i) {
-      current_node_ = parse_node.NthNamedChild(i);
+      current_node_ = parse_node.NthNamedChild(i + 1);
       Visit(node->arguments[i]);
   }
   // }
@@ -1010,8 +1006,45 @@ void BuildVisitor::Visit(LambdaFunction* node) {
 
 // Name
 
-void BuildVisitor::Visit(NameSuperExpression* node) { // TODO
+void BuildVisitor::Visit(NameSuperExpression* node) {
-  TODO;
+  auto parse_node = current_node_;
+
+  size_t child_count = parse_node.NamedChildCount();
+
+  bool namespaces_ended = false;
+
+  for (size_t i = 0; i < child_count; ++i) {
+      current_node_ = parse_node.NthNamedChild(i);
+      std::string current_node_type = current_node_.GetType();
+
+      if (current_node_type != parser::tokens::TypeSubExpression) {
+        namespaces_ended = true;
+
+        if (i + 1 == child_count) {
+          node->expressions.emplace_back();
+
+          if (current_node_type == parser::tokens::NameIdentifier) { // optimize ??
+            node->expressions.back() = std::make_unique<NameIdentifier>(current_node_.GetValue());
+          } else if (current_node_type == parser::tokens::Literal) {
+            node->expressions.back() = std::make_unique<Literal>();
+            Visit(*std::get<std::unique_ptr<Literal>>(node->expressions.back()).get());
+          } else {
+            // error
+          }
+          break;
+        }
+      }
+
+      if (!namespaces_ended) {
+        node->namespaces.emplace_back();
+        Visit(node->namespaces.back());
+      } else {
+        node->expressions.emplace_back();
+        Visit(node->expressions.back());
+      }
+  }
+
+  current_node_ = parse_node;
 }
 
 void BuildVisitor::Visit(NameExpression* node) {
@@ -1111,121 +1144,299 @@ void BuildVisitor::Visit(AnyName& node) {
 // Type
 
 void BuildVisitor::Visit(TypeConstructor* node) {
-  out_ << "<TypeConstructor> ";
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.ChildByFieldName("type");
+  node->type = std::make_unique<ParametrizedType>();
   Visit(node->type.get());
-  out_ << '\n';
+
-  for (auto& parameter : node->parameters) {
+  size_t parameter_count = (parse_node.NamedChildCount() - 1) / 2;
-    Visit(&parameter.first);
+
-    out_ << " = ";
+  node->parameters.resize(parameter_count);
-    Visitor::Visit(parameter.second);
+
-    out_ << '\n';
+  for (size_t i = 0; i < parameter_count * 2; ++i) {
+    current_node_ = parse_node.NthNamedChild(i + 1);
+
+    if (i % 2 == 0) {
+      node->parameters[i / 2].first = current_node_.GetValue();
+    } else {
+      Visit(node->parameters[i / 2].second);
+    }
   }
-  out_ << "</TypeConstructor>\n";
+
+  current_node_ = parse_node;
 }
 
 void BuildVisitor::Visit(TupleType* node) {
-  out_ << "<TupleType> ";
+  auto parse_node = current_node_;
-  Visit(&node->type); // optional
+
-  out_ << ' ';
+  size_t current_node_n = 0;
-  for (auto& entity : node->entities) {
+
-    out_ << "& ";
+  current_node_ = parse_node.NthNamedChild(current_node_n);
-    if (entity.first != "") {
+
-      Visit(&entity.first);
+  if (current_node_.GetType() == parser::tokens::TypeIdentifierDefinition) {
-      out_ << " : ";
+    node->type = current_node_.GetValue(); // TODO check
-    }
+
-    Visitor::Visit(entity.second);
+    ++current_node_n;
+    current_node_ = parse_node.NthNamedChild(current_node_n);
   }
-  out_ << "</TupleType>";
+
+  while (current_node_n < parse_node.NamedChildCount()) {
+    node->entities.emplace_back();
+
+    if (current_node_.GetType() == parser::tokens::NameIdentifier) {
+      node->entities.back().first = current_node_.GetValue();
+
+      ++current_node_n;
+      current_node_ = parse_node.NthNamedChild(current_node_n);
+    }
+
+    Visit(node->entities.back().second);
+
+    ++current_node_n;
+    current_node_ = parse_node.NthNamedChild(current_node_n);
+  }
+
+  current_node_ = parse_node;
 }
 
 void BuildVisitor::Visit(VariantType* node) {
-  out_ << "<VariantType> ";
+  auto parse_node = current_node_;
-  Visit(&node->type); // optional
+
-  out_ << ' ';
+  size_t current_node_n = 0;
-  for (auto& constructor : node->constructors) {
+
-    out_ << "| ";
+  current_node_ = parse_node.NthNamedChild(current_node_n);
-    Visit(&constructor.first);
+
-    Visit(constructor.second.get());
+  if (current_node_.GetType() == parser::tokens::TypeIdentifierDefinition) {
+    node->type = current_node_.GetValue(); // TODO check
+
+    ++current_node_n;
+    current_node_ = parse_node.NthNamedChild(current_node_n);
   }
-  out_ << "</VariantType>";
+
+  while (current_node_n < parse_node.NamedChildCount()) {
+    std::string current_node_type = current_node_.GetType();
+
+    node->constructors.emplace_back();
+
+    if (current_node_type == parser::tokens::TypeIdentifierDefinition) { // optimize ??
+      node->constructors.back() = current_node_.GetValue(); // TODO check
+    } else if (current_node_type == parser::tokens::TupleType) {
+      node->constructors.back() = std::make_unique<TupleType>();
+      Visit(std::get<std::unique_ptr<TupleType>>(node->constructors.back()).get());
+    } else {
+      // error
+    }
+
+    ++current_node_n;
+    current_node_ = parse_node.NthNamedChild(current_node_n);
+  }
+
+  current_node_ = parse_node;
 }
 
 void BuildVisitor::Visit(AnnotatedType* node) {
-  out_ << "<AnnotatedType> ";
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.ChildByFieldName("type_expression");
+  node->type_expression = std::make_unique<TypeExpression>();
   Visit(node->type_expression.get());
-  if (node->annotations.size() > 0) {
+
-    out_ << " :";
+  size_t child_count = parse_node.NamedChildCount();
+
+  if (child_count > 1) {
+    node->annotations.resize(child_count - 1, std::make_unique<ParametrizedTypeclass>());
+
+    for (size_t i = 0; i < child_count - 1; ++i) {
+        current_node_ = parse_node.NthNamedChild(i + 1);
+        Visit(node->annotations[i].get());
+    }
   }
-  for (auto& annotation : node->annotations) {
+
-    out_ << " ";
+  current_node_ = parse_node;
-    Visit(annotation.get());
-  }
-  out_ << "</AnnotatedType>";
 }
 
 void BuildVisitor::Visit(ParametrizedType* node) {
-  out_ << "<ParametrizedType> ";
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.ChildByFieldName("type_expression");
+  node->type_expression = std::make_unique<TypeExpression>();
   Visit(node->type_expression.get());
-  for (auto& paramater : node->parameters) {
+
-    out_ << ' ';
+  size_t child_count = parse_node.NamedChildCount();
-    Visitor::Visit(paramater);
+
+  if (child_count > 1) {
+    node->parameters.resize(child_count - 1);
+
+    for (size_t i = 0; i < child_count - 1; ++i) {
+        current_node_ = parse_node.NthNamedChild(i + 1);
+        Visit(node->parameters[i]);
+    }
   }
-  out_ << " </ParamtrizedType>";
+
+  current_node_ = parse_node;
 }
 
 void BuildVisitor::Visit(TypeExpression* node) {
-  out_ << "<TypeExpression> ";
+  auto parse_node = current_node_;
-  for (auto& type_namespace : node->namespaces) {
+
-    Visitor::Visit(type_namespace);
+  size_t child_count = parse_node.NamedChildCount();
-    out_ << '.';
+
+  if (child_count > 1) {
+    node->namespaces.resize(child_count - 1);
+
+    for (size_t i = 0; i < child_count - 1; ++i) {
+        current_node_ = parse_node.NthNamedChild(i);
+        Visit(node->namespaces[i]);
+    }
   }
-  Visit(&node->type);
+
-  out_ << " </TypeExpression>";
+  node->type = parse_node.ChildByFieldName("type").GetValue();
+
+  current_node_ = parse_node;
+}
+
+void BuildVisitor::Visit(AnyType& node) {
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.NthNamedChild(0);
+
+  std::string current_node_type = current_node_.GetType();
+
+  if (current_node_type == parser::tokens::ParametrizedType) { // optimize ??
+    node = std::make_unique<ParametrizedType>();
+    Visit(std::get<std::unique_ptr<ParametrizedType>>(node).get());
+  } else if (current_node_type == parser::tokens::TupleType) {
+    node = std::make_unique<TupleType>();
+    Visit(std::get<std::unique_ptr<TupleType>>(node).get());
+  } else if (current_node_type == parser::tokens::VariantType) {
+    node = std::make_unique<VariantType>();
+    Visit(std::get<std::unique_ptr<VariantType>>(node).get());
+  } else {
+    // error
+  }
+
+  current_node_ = parse_node;
+}
+
+void BuildVisitor::Visit(TypeSubExpression& node) {
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.NthNamedChild(0);
+
+  std::string current_node_type = current_node_.GetType();
+
+  if (current_node_type == parser::tokens::TypeIdentifier) { // optimize ??
+    node = std::make_unique<TypeIdentifier>();
+    Visit(std::get<std::unique_ptr<TypeIdentifier>>(node).get());
+  } else if (current_node_type == parser::tokens::AbstractTypeIdentifier) {
+    node = std::make_unique<AbstractTypeIdentifier>();
+    Visit(std::get<std::unique_ptr<AbstractTypeIdentifier>>(node).get());
+  } else if (current_node_type == parser::tokens::ParametrizedType) {
+    node = std::make_unique<ParametrizedType>();
+    Visit(std::get<std::unique_ptr<ParametrizedType>>(node).get());
+  } else {
+    // error
+  }
+
+  current_node_ = parse_node;
+}
+
+void BuildVisitor::Visit(TypeParameter& node) {
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.NthNamedChild(0);
+
+  std::string current_node_type = current_node_.GetType();
+
+  if (current_node_type == parser::tokens::ParametrizedType) { // optimize ??
+    node = std::make_unique<ParametrizedType>();
+    Visit(std::get<std::unique_ptr<ParametrizedType>>(node).get());
+  } else if (current_node_type == parser::tokens::Expression) {
+    node = std::make_unique<Expression>();
+    Visit(*std::get<std::unique_ptr<Expression>>(node).get());
+  } else {
+    // error
+  }
+
+  current_node_ = parse_node;
 }
 
 // Typeclass
 
 void BuildVisitor::Visit(AnnotatedTypeclass* node) {
-  out_ << "<AnnotatedTypeclass> ";
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.ChildByFieldName("typeclass_expression");
+  node->typeclass_expression = std::make_unique<TypeclassExpression>();
   Visit(node->typeclass_expression.get());
-  if (node->annotations.size() > 0) {
+
-    out_ << " :";
+  size_t child_count = parse_node.NamedChildCount();
+
+  if (child_count > 1) {
+    node->annotations.resize(child_count - 1, std::make_unique<ParametrizedTypeclass>());
+
+    for (size_t i = 0; i < child_count - 1; ++i) {
+        current_node_ = parse_node.NthNamedChild(i + 1);
+        Visit(node->annotations[i].get());
+    }
   }
-  for (auto& annotation : node->annotations) {
+
-    out_ << " ";
+  current_node_ = parse_node;
-    Visit(annotation.get());
-  }
-  out_ << "</AnnotatedTypeclass>";
 }
 
 void BuildVisitor::Visit(ParametrizedTypeclass* node) {
-  out_ << "<ParametrizedTypeclass> ";
+  auto parse_node = current_node_;
+
+  current_node_ = parse_node.ChildByFieldName("typeclass_expression");
+  node->typeclass_expression = std::make_unique<TypeclassExpression>();
   Visit(node->typeclass_expression.get());
-  for (auto& paramater : node->parameters) {
+
-    out_ << ' ';
+  size_t child_count = parse_node.NamedChildCount();
-    Visitor::Visit(paramater);
+
+  if (child_count > 1) {
+    node->parameters.resize(child_count - 1);
+
+    for (size_t i = 0; i < child_count - 1; ++i) {
+        current_node_ = parse_node.NthNamedChild(i + 1);
+        Visit(node->parameters[i]);
+    }
   }
-  out_ << " </ParamtrizedTypeclass>";
+
+  current_node_ = parse_node;
 }
 
 void BuildVisitor::Visit(TypeclassExpression* node) {
-  out_ << "<TypeclassExpression> ";
+  auto parse_node = current_node_;
-  for (auto& typeclass_namespace : node->namespaces) {
+
-    Visitor::Visit(typeclass_namespace);
+  size_t child_count = parse_node.NamedChildCount();
-    out_ << '.';
+
+  if (child_count > 1) {
+    node->namespaces.resize(child_count - 1);
+
+    for (size_t i = 0; i < child_count - 1; ++i) {
+        current_node_ = parse_node.NthNamedChild(i);
+        Visit(node->namespaces[i]);
+    }
   }
-  Visit(&node->typeclass);
+
-  out_ << " </TypeclassExpression>";
+  node->typeclass = parse_node.ChildByFieldName("typeclass").GetValue();
+
+  current_node_ = parse_node;
 }
 
 // Identifiers, constants, etc. -----------------
 
+void BuildVisitor::Visit(AnyIdentifier* node) { // std::string
+  *node = current_node_.GetValue();
+} // TODO use in other places ??
+
 void BuildVisitor::Visit(FloatNumberLiteral* node) {
-  node->value = current_node_.NthChild(0).GetValue();
+  node->value = std::stod(current_node_.NthChild(0).GetValue());
 }
 
 void BuildVisitor::Visit(NumberLiteral* node) {
-  node->value = current_node_.NthChild(0).GetValue();
+  node->value = std::stoll(current_node_.NthChild(0).GetValue());
 }
 
 void BuildVisitor::Visit(StringLiteral* node) {
@@ -1233,7 +1444,7 @@ void BuildVisitor::Visit(StringLiteral* node) {
 }
 
 void BuildVisitor::Visit(CharLiteral* node) {
-  node->value = current_node_.NthChild(1).GetValue();
+  node->value = current_node_.NthChild(1).GetValue()[0];
 }
 
 void BuildVisitor::Visit(Literal& node) {
@@ -1274,10 +1485,10 @@ void BuildVisitor::Visit(NameSubSuperExpression& node) {
     Visit(std::get<std::unique_ptr<NameIdentifier>>(node).get());
   } else if (current_node_type == parser::tokens::Literal) {
     node = std::make_unique<Literal>();
-    Visit(std::get<std::unique_ptr<Literal>>(node).get());
+    Visit(*std::get<std::unique_ptr<Literal>>(node).get());
   } else if (current_node_type == parser::tokens::SuperExpression) {
     node = std::make_unique<SuperExpression>();
-    Visit(std::get<std::unique_ptr<SuperExpression>>(node).get());
+    Visit(*std::get<std::unique_ptr<SuperExpression>>(node).get());
   } else {
     // error
   }

src/print_visitor.cpp

@@ -516,12 +516,14 @@ void PrintVisitor::Visit(TypeConstructor* node) {
 
 void PrintVisitor::Visit(TupleType* node) {
   out_ << "<TupleType> ";
-  Visit(&node->type); // optional
+  if (node->type.has_value()) {
+    Visit(&node->type.value()); // optional
+  }
   out_ << ' ';
   for (auto& entity : node->entities) {
     out_ << "& ";
-    if (entity.first != "") {
+    if (entity.first.has_value()) {
-      Visit(&entity.first);
+      Visit(&entity.first.value());
       out_ << " : ";
     }
     Visitor::Visit(entity.second);
@@ -531,12 +533,19 @@ void PrintVisitor::Visit(TupleType* node) {
 
 void PrintVisitor::Visit(VariantType* node) {
   out_ << "<VariantType> ";
-  Visit(&node->type); // optional
+  if (node->type.has_value()) {
+    Visit(&node->type.value());
+  }
   out_ << ' ';
   for (auto& constructor : node->constructors) {
     out_ << "| ";
-    Visit(&constructor.first);
+    if (std::holds_alternative<TypeIdentifierDefinition>(constructor)) {
-    Visit(constructor.second.get());
+    Visit(&std::get<TypeIdentifierDefinition>(constructor));
+    } else if (std::holds_alternative<std::unique_ptr<TupleType>>(constructor)) {
+      Visit(std::get<std::unique_ptr<TupleType>>(constructor).get());
+    } else {
+      // error
+    }
   }
   out_ << "</VariantType>";
 }