Fix passing around results

CMakeLists.txt

@@ -15,7 +15,7 @@ separate_arguments(LLVM_DEFINITIONS_LIST NATIVE_COMMAND ${LLVM_DEFINITIONS})
 add_definitions(${LLVM_DEFINITIONS_LIST})
 
 # Executable
-add_executable(${PROJECT_NAME} src/main.cpp src/tokens.cpp src/parsing.cpp)
+add_executable(${PROJECT_NAME} src/main.cpp src/tokens.cpp src/parsing.cpp src/ast.cpp)
 target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_20)
 
 # Find the libraries that correspond to the LLVM components

src/ast.cpp

@@ -0,0 +1,15 @@
+#include "ast.h"
+
+namespace AST {
+    std::string ReturnStatement::formatted() {
+        return "ReturnStatement";
+    }
+
+    std::string IntLiteralExpression::formatted() {
+        return "IntLiteral";
+    }
+
+    std::string Function::formatted() {
+        return "Function";
+    }
+}

src/ast.h

@@ -6,7 +6,10 @@
 #include <memory>
 
 namespace AST {
-    class Node {};
+    class Node {
+    public:
+        virtual std::string formatted() = 0;
+    };
 
     class Expression : public Node {};
     class Type {};
@@ -17,6 +20,7 @@ namespace AST {
         int m_value;
     public:
         IntLiteralExpression(int value) : m_value{ value } {}
+        virtual std::string formatted() override;
     };
 
 
@@ -25,6 +29,7 @@ namespace AST {
         std::unique_ptr<Expression> m_expr;
     public:
         ReturnStatement(std::unique_ptr<Expression> expr) : m_expr{ std::move(expr) } {}
+        virtual std::string formatted() override;
     };
 
     class TopLevelStatement : public Node {};
@@ -46,6 +51,7 @@ namespace AST {
             , m_name{ name }
             , m_statements{ std::move(statements) } {
         }
+        virtual std::string formatted() override;
     };
 
     enum class FundamentalTypeKind {

src/main.cpp

@@ -56,11 +56,16 @@ int main() {
     std::vector<std::unique_ptr<AST::TopLevelStatement>> statements;
     auto statement = parsing::parse_top_level_statement(stream);
     while (statement.ok()) {
-        statements.push_back(statement.unwrap());
+        statements.push_back(std::move(statement.unwrap()));
         statement = parsing::parse_top_level_statement(stream);
     }
     stream.expect(token::Type::Eof);
 
+    for (int i = 0; i < statements.size(); i++) {
+        if (statements[i])
+            std::cout << statements[i]->formatted() << std::endl;
+    }
+
     // LLVM Hello World
     // llvm_hello_world();
 

src/parsing.cpp

@@ -11,10 +11,10 @@ namespace parsing {
                 stream.m_position = inner.m_position;
 
                 auto ty = new AST::FundamentalType{ AST::FundamentalTypeKind::Int };
-                return std::unique_ptr<AST::Type> {ty};
+                return new std::unique_ptr<AST::Type>{ ty };
             }
             catch (std::runtime_error error) {
-                return std::string{ error.what() };
+                return new std::string{ error.what() };
             }
         }
 
@@ -26,14 +26,14 @@ namespace parsing {
                     stream.m_position = inner.m_position;
 
                     auto expr = new AST::IntLiteralExpression{ 5 };
-                    return std::unique_ptr<AST::Expression>{expr};
+                    return new std::unique_ptr<AST::Expression>{ expr };
                 }
                 else {
                     throw std::runtime_error("Expected expression");
                 }
             }
             catch (std::runtime_error error) {
-                return std::string{ error.what() };
+                return new std::string{ error.what() };
             }
         }
 
@@ -48,7 +48,7 @@ namespace parsing {
                     stream.m_position = inner.m_position;
 
                     auto ret = new AST::ReturnStatement{ std::move(expression) };
-                    return std::unique_ptr<AST::Statement>{ ret };
+                    return new std::unique_ptr<AST::Statement>{ ret };
                 }
                 else {
                     throw std::runtime_error("Expected return-keyword");
@@ -56,7 +56,7 @@ namespace parsing {
 
             }
             catch (std::runtime_error error) {
-                return std::string{ error.what() };
+                return new std::string{ error.what() };
             }
         }
     }
@@ -84,10 +84,10 @@ namespace parsing {
             stream.m_position = inner.m_position;
 
             auto fun = new AST::Function{ std::move(type), {}, "main", std::move(statements) };
-            return std::unique_ptr<AST::TopLevelStatement>{ fun };
+            return new std::unique_ptr<AST::TopLevelStatement>{ fun };
         }
         catch (std::runtime_error error) {
-            return std::string(error.what());
+            return new std::string(error.what());
         }
     }
 }

src/result.h

@@ -3,6 +3,7 @@
 #define RESULT_H
 
 #include <memory>
+#include <iostream>
 
 template<typename T, typename TErr>
 class Result {
@@ -11,8 +12,8 @@ private:
     std::unique_ptr<TErr> m_error;
 
 public:
-    Result(T value) : m_value{ std::make_unique<T>() }, m_error{ nullptr } {}
-    Result(TErr error) : m_value{ nullptr }, m_error{ std::make_unique<TErr>() } {}
+    Result(T* value) : m_value{ std::unique_ptr<T>{value} }, m_error{ nullptr } {}
+    Result(TErr* error) : m_value{ nullptr }, m_error{ std::unique_ptr<TErr>{error} } {}
 
     bool ok() {
         return !m_error;