feat(lua): signals implemented

autogen/src/object/analysis.cpp

@@ -119,6 +119,27 @@ static void processField(CXCursor cur, ClassAnalysis* state) {
     };
 }
 
+static void processSignal(CXCursor cur, ClassAnalysis* state) {
+    std::optional<std::string> signalDef = findAnnotation(cur, "OB::def_signal");
+    if (!signalDef) return;
+
+    SignalAnalysis anly;
+
+    auto result = parseAnnotationString(signalDef.value());
+    std::string fieldName = x_clang_toString(clang_getCursorDisplayName(cur));
+
+    anly.name = result["name"];
+    anly.sourceFieldName = fieldName;
+
+    // if name field is not provided, use fieldName instead, but capitalize the first character
+    if (anly.name == "") {
+        anly.name = fieldName;
+        anly.name[0] = std::toupper(anly.name[0]);
+    }
+
+    state->signals.push_back(anly);
+}
+
 static void processClass(CXCursor cur, AnalysisState* state, std::string className, std::string srcRoot) {
     ClassAnalysis anly;
 
@@ -159,6 +180,7 @@ static void processClass(CXCursor cur, AnalysisState* state, std::string classNa
         if (kind != CXCursor_FieldDecl) return CXChildVisit_Continue;
         
         processField(cur, &anly);
+        processSignal(cur, &anly);
 
         return CXChildVisit_Continue;
     });

autogen/src/object/analysis.h

@@ -36,6 +36,11 @@ struct PropertyAnalysis {
     PropertyFlags flags = (PropertyFlags)0;
 };
 
+struct SignalAnalysis {
+    std::string name;
+    std::string sourceFieldName;
+};
+
 // https://stackoverflow.com/a/1448478/16255372
 inline ClassFlags operator|(ClassFlags a, ClassFlags b) {
     return static_cast<ClassFlags>(static_cast<int>(a) | static_cast<int>(b));
@@ -51,6 +56,7 @@ struct ClassAnalysis {
     std::string headerPath;
     bool abstract = false;
     std::vector<PropertyAnalysis> properties;
+    std::vector<SignalAnalysis> signals;
     ClassFlags flags = (ClassFlags)0;
     std::string explorerIcon;
 };

autogen/src/object/codegen.cpp

@@ -146,6 +146,18 @@ static void writePropertyGetHandler(std::ofstream& out, ClassAnalysis state) {
         out << "\n    }";
         first = false;
     }
+
+    // Handle signals
+    out << "\n    ";
+    first = true;
+    for (auto& signal : state.signals) {
+        out << (first ? "" : " else ") << "if (name == \"" << signal.name << "\") {";
+
+        out << "\n        return Data::Variant(Data::SignalRef(" << signal.sourceFieldName << "));";
+
+        out << "\n    }";
+        first = false;
+    }
     
     out << "\n    return " << state.baseClass << "::InternalGetPropertyValue(name);";
     // out << "\n    return MemberNotFound(\"" << state.name << "\", name);";
@@ -199,6 +211,23 @@ static void writePropertyMetaHandler(std::ofstream& out, ClassAnalysis state) {
         out << "\n    }";
         first = false;
     }
+
+    // Handle signals
+    out << "\n    ";
+    first = true;
+    for (auto& signal : state.signals) {
+        out << (first ? "" : " else ") << "if (name == \"" << signal.name << "\") {";
+        
+        std::string strFlags;
+        strFlags += "PROP_READONLY";
+        strFlags += "| PROP_HIDDEN";
+        strFlags += "| PROP_NOSAVE";
+
+        out << "\n        return PropertyMeta { &SignalRef::TYPE, " << strFlags << " };";
+
+        out << "\n    }";
+        first = false;
+    }
     
     out << "\n    return " << state.baseClass << "::InternalGetPropertyMeta(name);";
     // out << "\n    return MemberNotFound(\"" << state.name << "\", name);";

core/src/datatypes/meta.h

@@ -5,6 +5,7 @@
 #include "base.h"
 #include "datatypes/color3.h"
 #include "datatypes/ref.h"
+#include "datatypes/signal.h"
 #include "vector.h"
 #include "cframe.h"
 
@@ -26,7 +27,9 @@ namespace Data {
         Vector3,
         CFrame,
         Color3,
-        InstanceRef
+        InstanceRef,
+        SignalRef,
+        SignalConnectionRef
     > __VARIANT_TYPE;
 
     class Variant {

core/src/datatypes/signal.cpp

@@ -1,7 +1,10 @@
 #include "signal.h"
+#include "datatypes/base.h"
 #include "meta.h"
 #include "lua.h"
+#include <luajit-2.1/lauxlib.h>
 #include <luajit-2.1/lua.h>
+#include <pugixml.hpp>
 #include <memory>
 
 SignalSource::SignalSource() {}
@@ -67,11 +70,11 @@ void CSignalConnection::Call(std::vector<Data::Variant> args) {
 //
 
 void Signal::Connect(std::function<void(std::vector<Data::Variant>)> callback) {
-    connections.push_back(std::dynamic_pointer_cast<SignalConnection>(std::make_shared<CSignalConnection>(callback)));
+    connections.push_back(std::dynamic_pointer_cast<SignalConnection>(std::make_shared<CSignalConnection>(CSignalConnection(callback))));
 }
 
 void Signal::Connect(lua_State* state) {
-    connections.push_back(std::dynamic_pointer_cast<SignalConnection>(std::make_shared<LuaSignalConnection>(state)));
+    connections.push_back(std::dynamic_pointer_cast<SignalConnection>(std::make_shared<LuaSignalConnection>(LuaSignalConnection(state))));
 }
 
 void Signal::Fire(std::vector<Data::Variant> args) {
@@ -97,4 +100,162 @@ void SignalConnection::Disconnect() {
             it++;
     }
     parentSignal = {};
+}
+
+//
+
+static int signal_gc(lua_State*);
+static int signal_index(lua_State*);
+static int signal_tostring(lua_State*);
+static const struct luaL_Reg signal_metatable [] = {
+    {"__gc", signal_gc},
+    {"__index", signal_index},
+    {"__tostring", signal_tostring},
+    {NULL, NULL} /* end of array */
+};
+
+
+static int signal_gc(lua_State* L) {
+    // Destroy the contained shared_ptr
+    auto userdata = (std::weak_ptr<Signal>*)luaL_checkudata(L, 1, "__mt_signal");
+    delete userdata;
+    lua_pop(L, 1);
+
+    return 0;
+}
+
+// __index(t,k)
+static int signal_index(lua_State* L) {
+    auto userdata = (std::weak_ptr<Signal>*)luaL_checkudata(L, 1, "__mt_signal");
+    std::weak_ptr<Signal> signal = *userdata;
+    std::string key(lua_tostring(L, 2));
+    lua_pop(L, 2);
+
+    return luaL_error(L, "'%s' is not a valid member of %s", key.c_str(), "Signal");
+}
+
+Data::SignalRef::SignalRef(std::weak_ptr<Signal> ref) : signal(ref) {}
+Data::SignalRef::~SignalRef() = default;
+
+const Data::TypeInfo Data::SignalRef::TYPE = {
+    .name = "Signal",
+    .fromLuaValue = &Data::SignalRef::FromLuaValue,
+};
+
+const Data::TypeInfo& Data::SignalRef::GetType() const { return Data::SignalRef::TYPE; };
+
+const Data::String Data::SignalRef::ToString() const {
+    return Data::String("Signal");
+}
+
+Data::SignalRef::operator std::weak_ptr<Signal>() {
+    return signal;
+}
+
+void Data::SignalRef::Serialize(pugi::xml_node node) const {
+    // Not serializable
+}
+
+void Data::SignalRef::PushLuaValue(lua_State* L) const {
+    int n = lua_gettop(L);
+
+    auto userdata = (std::weak_ptr<Signal>*)lua_newuserdata(L, sizeof(void*));
+    new(userdata) std::weak_ptr(signal);
+
+    // Create the instance's metatable
+    luaL_newmetatable(L, "__mt_signal");
+    luaL_register(L, NULL, signal_metatable);
+
+    lua_setmetatable(L, n+1);
+}
+
+result<Data::Variant, LuaCastError> Data::SignalRef::FromLuaValue(lua_State* L, int idx) {
+    auto userdata = (std::weak_ptr<Signal>*)luaL_checkudata(L, 1, "__mt_signal");
+    lua_pop(L, 1);
+    return Data::Variant(Data::SignalRef(*userdata));
+}
+
+static int signal_tostring(lua_State* L) {
+    lua_pop(L, 1);
+    lua_pushstring(L, "Signal");
+    return 1;
+}
+
+//
+
+static int signalconnection_gc(lua_State*);
+static int signalconnection_index(lua_State*);
+static int signalconnection_tostring(lua_State*);
+static const struct luaL_Reg signalconnection_metatable [] = {
+    {"__gc", signalconnection_gc},
+    {"__index", signalconnection_index},
+    {"__tostring", signalconnection_tostring},
+    {NULL, NULL} /* end of array */
+};
+
+
+static int signalconnection_gc(lua_State* L) {
+    // Destroy the contained shared_ptr
+    auto userdata = (std::weak_ptr<SignalConnection>*)luaL_checkudata(L, 1, "__mt_signalconnection");
+    delete userdata;
+    lua_pop(L, 1);
+
+    return 0;
+}
+
+// __index(t,k)
+static int signalconnection_index(lua_State* L) {
+    auto userdata = (std::weak_ptr<SignalConnection>*)luaL_checkudata(L, 1, "__mt_signalconnection");
+    std::weak_ptr<SignalConnection> signalConnection = *userdata;
+    std::string key(lua_tostring(L, 2));
+    lua_pop(L, 2);
+
+    return luaL_error(L, "'%s' is not a valid member of %s", key.c_str(), "SignalConnection");
+}
+
+Data::SignalConnectionRef::SignalConnectionRef(std::weak_ptr<SignalConnection> ref) : signalConnection(ref) {}
+Data::SignalConnectionRef::~SignalConnectionRef() = default;
+
+const Data::TypeInfo Data::SignalConnectionRef::TYPE = {
+    .name = "Signal",
+    .fromLuaValue = &Data::SignalConnectionRef::FromLuaValue,
+};
+
+const Data::TypeInfo& Data::SignalConnectionRef::GetType() const { return Data::SignalConnectionRef::TYPE; };
+
+const Data::String Data::SignalConnectionRef::ToString() const {
+    return Data::String("Connection");
+}
+
+Data::SignalConnectionRef::operator std::weak_ptr<SignalConnection>() {
+    return signalConnection;
+}
+
+void Data::SignalConnectionRef::Serialize(pugi::xml_node node) const {
+    // Not serializable
+}
+
+void Data::SignalConnectionRef::PushLuaValue(lua_State* L) const {
+    int n = lua_gettop(L);
+
+    auto userdata = (std::weak_ptr<SignalConnection>*)lua_newuserdata(L, sizeof(void*));
+    new(userdata) std::weak_ptr(signalConnection);
+
+    // Create the instance's metatable
+    luaL_newmetatable(L, "__mt_signalconnection");
+    luaL_register(L, NULL, signalconnection_metatable);
+
+    lua_setmetatable(L, n+1);
+}
+
+result<Data::Variant, LuaCastError> Data::SignalConnectionRef::FromLuaValue(lua_State* L, int idx) {
+    auto userdata = (std::weak_ptr<SignalConnection>*)luaL_checkudata(L, 1, "__mt_signalconnection");
+    lua_pop(L, 1);
+    return Data::Variant(Data::SignalConnectionRef(*userdata));
+}
+
+static int signalconnection_tostring(lua_State* L) {
+    lua_pop(L, 1);
+    lua_pushstring(L, "SignalConnection");
+    return 1;
 }

core/src/datatypes/signal.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "base.h"
+#include "datatypes/annotation.h"
 #include <functional>
 #include <memory>
 #include <vector>
@@ -18,16 +19,16 @@ class SignalConnection : public std::enable_shared_from_this<SignalConnection> {
 protected:
     std::weak_ptr<Signal> parentSignal;
 
-    virtual ~SignalConnection();
-
-    virtual void Call(std::vector<Data::Variant>);
+    virtual void Call(std::vector<Data::Variant>) = 0;
     friend Signal;
 public:
     inline bool Connected() { return !parentSignal.expired(); };
     void Disconnect();
+
+    virtual ~SignalConnection();
 };
 
-class CSignalConnection : protected SignalConnection {
+class CSignalConnection : public SignalConnection {
     std::function<void(std::vector<Data::Variant>)> function;
 
     CSignalConnection(std::function<void(std::vector<Data::Variant>)>);
@@ -37,15 +38,16 @@ protected:
     void Call(std::vector<Data::Variant>) override;
 };
 
-class LuaSignalConnection : protected SignalConnection {
+class LuaSignalConnection : public SignalConnection {
     lua_State* thread;
 
     LuaSignalConnection(lua_State*);
-    ~LuaSignalConnection();
 
     friend Signal;
 protected:
     void Call(std::vector<Data::Variant>) override;
+public:
+    ~LuaSignalConnection();
 };
 
 class Signal {
@@ -71,9 +73,40 @@ public:
 namespace Data {
     class SignalRef : public Data::Base {
         std::weak_ptr<Signal> signal;
+
+    public:
+        SignalRef(std::weak_ptr<Signal>);
+        ~SignalRef();
+
+        virtual const TypeInfo& GetType() const override;
+        static const TypeInfo TYPE;
+
+        operator std::weak_ptr<Signal>();
+
+        virtual const Data::String ToString() const override;
+        virtual void Serialize(pugi::xml_node node) const override;
+        virtual void PushLuaValue(lua_State*) const override;
+        static result<Data::Variant, LuaCastError> FromLuaValue(lua_State*, int idx);
     };
 
     class SignalConnectionRef : public Data::Base {
-        std::weak_ptr<Signal> signal;
+        std::weak_ptr<SignalConnection> signalConnection;
+
+    public:
+        SignalConnectionRef(std::weak_ptr<SignalConnection>);
+        ~SignalConnectionRef();
+
+        virtual const TypeInfo& GetType() const override;
+        static const TypeInfo TYPE;
+
+        operator std::weak_ptr<SignalConnection>();
+
+        virtual const Data::String ToString() const override;
+        virtual void Serialize(pugi::xml_node node) const override;
+        virtual void PushLuaValue(lua_State*) const override;
+        static result<Data::Variant, LuaCastError> FromLuaValue(lua_State*, int idx);
     };
-}
+}
+
+using Data::SignalRef;
+using Data::SignalConnectionRef;

core/src/objects/annotation.h

@@ -6,12 +6,14 @@
 #ifdef __AUTOGEN__
 #define def_inst(...) clang::annotate("OB::def_inst", #__VA_ARGS__)
 #define def_prop(...) clang::annotate("OB::def_prop", #__VA_ARGS__)
+#define def_signal(...) clang::annotate("OB::def_signal", #__VA_ARGS__)
 #define def_prop_category(...) clang::annotate("OB::def_prop_category", #__VA_ARGS__)
 #define cframe_position_prop(...) clang::annotate("OB::cframe_position_prop", #__VA_ARGS__)
 #define cframe_rotation_prop(...) clang::annotate("OB::cframe_rotation_prop", #__VA_ARGS__)
 #else
 #define def_inst(...)
 #define def_prop(...)
+#define def_signal(...)
 #define def_prop_category(...)
 #define cframe_position_prop(...)
 #define cframe_rotation_prop(...)
@@ -26,6 +28,8 @@
 #define DEF_INST_SERVICE_(...) [[ def_inst(__VA_ARGS__, service) ]]
 #define DEF_PROP [[ def_prop() ]]
 #define DEF_PROP_(...) [[ def_prop(__VA_ARGS__) ]]
+#define DEF_SIGNAL [[ def_signal() ]]
+#define DEF_SIGNAL_(...) [[ def_signal(__VA_ARGS__) ]]
 
 // Categories
 #define DEF_PROP_CATEGORY(CATEGORY) [[ def_prop_category(category=CATEGORY) ]]

core/src/objects/part.h

@@ -92,7 +92,7 @@ public:
     DEF_PROP float frontParamB = 0.5;
     DEF_PROP float backParamB = 0.5;
 
-    SignalSource OnParentUpdated;
+    DEF_SIGNAL SignalSource OnParentUpdated;
 
     rp::RigidBody* rigidBody = nullptr;