stuffs

src/typechecker/type.hpp

@@ -17,9 +17,9 @@ namespace Solstice {
         Add, Subtract, Multiply, Divide, Equal, NotEqual, GreaterThan, LesserThan
     };
 
-    struct Type {
+    struct Type;
-        BaseType type = BaseType::None;
+
-        std::variant<
+    using TypeData = std::variant<
             // object
             std::map<std::string, Type>, // use map for ordering
             // tuple
@@ -28,16 +28,20 @@ namespace Solstice {
             std::shared_ptr<Type>,
             // anything else
             std::nullopt_t
-        > fields = std::nullopt;
+        >;
 
-        bool isConstant = false;
+    struct Type {
+        BaseType type = BaseType::None;
 
         std::optional<std::map<std::string, Type>> getObject() const;
         std::optional<std::vector<Type>> getTuple() const;
         std::optional<Type> getArrayOrPointer() const;
 
+        TypeData fields = std::nullopt;
+
         Type() = default;
         Type(BaseType type) : type(type) {}
+        Type(BaseType type, TypeData fields) : type(type), fields(fields) {}
     };
 
     bool operator==(const Type& left, const Type& right);
@@ -99,6 +103,23 @@ namespace std {
             return leftHash;
         }
     };
+
+    template<>
+    struct hash<vector<Solstice::Type>> {
+        size_t operator()(const vector<Solstice::Type> v) const {
+            size_t hash = 0;
+            for (const auto& type : v) {
+                size_t typeHash = std::hash<Solstice::Type>{}(type);
+                if (hash == 0) {
+                    hash = typeHash;
+                } else {
+                    hash ^= typeHash + 0x9e3779b97f4a7c15ULL + (hash << 6) + (hash >> 2);
+
+                }
+            }
+            return hash;
+        }
+    };
 }   
 
 namespace Solstice {
@@ -106,6 +127,9 @@ namespace Solstice {
     struct PossibleType {
         std::unordered_set<Type> possiblities;
 
+        bool unknownType = false;
+        bool isConstant = false;
+
         PossibleType() = default;
         PossibleType(const std::unordered_set<Type>& possiblities) : possiblities(possiblities) {}
 
@@ -113,13 +137,9 @@ namespace Solstice {
     };
 
     struct Function {
-        PossibleType returnType = {{BaseType::None}};
+        std::unordered_map<std::vector<Type>, Type> signatureToReturnType;
-        std::vector<PossibleType> argumentTypes = {};
 
         Function() = default;
-        Function(PossibleType returnType) : returnType(returnType) {}
-        Function(PossibleType returnType, std::vector<PossibleType> argumentTypes) 
-            : returnType(returnType), argumentTypes(argumentTypes) {}
     };
 
 }

src/typechecker/typechecker.cpp

@@ -6,6 +6,20 @@
 namespace Solstice {
 
     void TypeChecker::initOverloads() {
+
+        types = {
+            {"Int", {BaseType::Int}},
+            {"String", {BaseType::String}},
+            {"Double", {BaseType::Double}},
+            {"Bool", {BaseType::Bool}},
+            {"Char", {BaseType::Char}},
+            {"None", {}},
+            {"Tuple", {BaseType::Tuple}},
+            {"Array", {BaseType::Array}},
+            {"Pointer", {BaseType::Tuple}},
+            {"Object", {BaseType::Tuple}},
+        };
+
         addOverloads = {
             {{BaseType::Int, BaseType::Int}, BaseType::Int},
             {{BaseType::Double, BaseType::Double}, BaseType::Double},
@@ -132,7 +146,7 @@ namespace Solstice {
         if (!nodeType.has_value()) {
             throw std::runtime_error("cannot assign ambiguous type to name");
         }
-        variables[*id] = *nodeType;
+        variables[*id] = {{*nodeType}};
         variables[*id].isConstant = true;
     }
 
@@ -144,13 +158,45 @@ namespace Solstice {
         if (variables.find(*id) != variables.end()) {
             throw std::runtime_error("Cannot overwrite existing bind/variable/function with new function");
         }
+
+        // create sub-checker 
+        TypeChecker typeChecker(*this);
+        typeChecker.setNode(node.children[2]);
+
+        for (const auto& arg : node.children[1].children) {
+            switch (arg.type) {
+                case NodeType::Identifier: {
+                    typeChecker.setVariableUnknown(*arg.getIdentifier());
+                    break;
+                }
+                case NodeType::SetType: {
+                    // type annotation provided 
+                    if (arg.children[0].type != NodeType::Identifier && arg.children[1].type != NodeType::Identifier) {
+                        throw std::runtime_error("Invalid function parameter definition");
+                    }
+                    auto typeId = arg.children[1].getIdentifier();
+                    if (!typeId.has_value()) {
+                        throw std::runtime_error("FIXME identifier node does not contain identifier");
+                    }
+                    if (types.find(*typeId) == types.end()) {
+                        throw std::runtime_error("unknown type " + *typeId);
+                    }
+                    typeChecker.setVariable(*arg.children[0].getIdentifier(), types[*typeId]);
+                    break;
+                }
+                default: {
+                    throw std::runtime_error("Invalid function parameter definition");
+                }
+            }
+        }
+
+        typeChecker.checkTypes();
         
-        checkNodeType(node.children[1]);
+        auto nodeType = node.children[2].ptype.getOnlyType();
-        auto nodeType = node.children[1].ptype.getOnlyType();
         if (!nodeType.has_value()) {
             throw std::runtime_error("cannot assign ambiguous type to name");
         }
-        variables[*id] = *nodeType;
+        variables[*id] = {{*nodeType}};
         variables[*id].isConstant = true;
     }
 
@@ -173,10 +219,21 @@ namespace Solstice {
         if (!nodeType.has_value()) {
             throw std::runtime_error("cannot assign ambiguous type to name");
         }
-        variables[*id] = *nodeType;
+        variables[*id] = {{*nodeType}};
     }
 
-    void TypeChecker::checkCodeBlockType(Node& node) {}
+    void TypeChecker::checkCodeBlockType(Node& node) {
+        
+        return;
+    }
+
+    void TypeChecker::checkAddType(Node& node) {
+        // check node children
+        checkNodeType(node.children[0]);
+        checkNodeType(node.children[1]);
+
+        
+    }
 
 
     void TypeChecker::checkNodeType(Node& node) {
@@ -184,7 +241,16 @@ namespace Solstice {
             case NodeType::Root:
                 node.ptype = {{}}; // no possible types for root node
                 for (auto& child : node.children) {
-                    checkNodeType(child);
+                    // only allow certain node types in the root 
+                    switch (child.type) {
+                        case NodeType::Bind:
+                        case NodeType::FunctionBind:
+                            checkNodeType(child);
+                            break;
+                        default:
+                            throw std::runtime_error("Illegal node type in file root");
+
+                    }
                 }
                 break;
             case NodeType::Literal:
@@ -211,12 +277,36 @@ namespace Solstice {
             case NodeType::CodeBlock:
                 checkCodeBlockType(node);
                 break;
+            case NodeType::Add:
+                checkAddType(node);
+                break;
+            case NodeType::Subtract:
+                checkSubtractType(node);
+                break;
+            case NodeType::Multiply:
+                checkMultiplyType(node);
+                break;
+            case NodeType::Divide:
+                checkDivideType(node);
+                break;
+            case NodeType::Equal:
+                checkEqualType(node);
+                break;
+            case NodeType::NotEqual:
+                checkNotEqualType(node);
+                break;
+            case NodeType::GreaterThan:
+                checkGreaterThanType(node);
+                break;
+            case NodeType::LesserThan:
+                checkLesserThanType(node);
+                break;
 
         }
     }
 
     void TypeChecker::checkTypes() {
-        checkNodeType(input);
+        checkNodeType(*input);
     }
 
 

src/typechecker/typechecker.hpp

@@ -9,7 +9,7 @@
 namespace Solstice {
 
     class TypeChecker {
-        std::unordered_map<std::string, Type> variables;
+        std::unordered_map<std::string, PossibleType> variables;
         std::unordered_map<std::string, Type> types;
 
         std::unordered_map<TypePair, Type> addOverloads;
@@ -21,7 +21,7 @@ namespace Solstice {
         std::unordered_map<TypePair, Type> greaterThanOverloads;
         std::unordered_map<TypePair, Type> lesserThanOverloads;
 
-        Node& input;
+        Node* input;
 
         bool inFunction = false;
 
@@ -37,15 +37,38 @@ namespace Solstice {
 
         void checkCodeBlockType(Node& node);
 
+        void checkAddType(Node& node);
+        void checkSubtractType(Node& node);
+        void checkMultiplyType(Node& node);
+        void checkDivideType(Node& node);
+
+        void checkEqualType(Node& node);
+        void checkNotEqualType(Node& node);
+        void checkGreaterThanType(Node& node);
+        void checkLesserThanType(Node& node);
+
         void checkNodeType(Node& node);
 
         public:
 
         TypeChecker() = delete;
-        TypeChecker(Node& node) : input(node) {
+        TypeChecker(Node& node) : input(&node) {
             initOverloads();
         }
 
+        void setNode(Node& node) {
+            input = &node;
+        }
+
+        // Only for use as a public function. 
+        void setVariable(const std::string& name, const Type& type) {
+            variables[name] = {{type}};
+        }
+
+        void setVariableUnknown(const std::string& name) {
+            variables[name].unknownType = true;
+        }
+
         void checkTypes();
     };
 }