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//#include "entityx_lua.h"
#include <Script/entityx/entity_lua.hpp>
#include <stdio.h>
#include <string.h>
using namespace entityx::lua;
ComponentList entityx::lua::components;
namespace {
int ref_EntityManagerSharedPtr = LUA_REFNIL;
int ref_EntityId = LUA_REFNIL;
const char* TypeName_EntityManagerSharedPtr = "EntityManagerSharedPtr";
const char* TypeName_EntityId = "EntityId";
const char* setup_lua_create_entity_factory =
"function entityx.create_entity_factory(entity_manager_pointer)\n"
" local c = {}\n"
" c.__index = c\n"
" function c:new()\n"
" local ret = {}\n"
" ret.__index = ret\n"
" function ret:init()\n"
" -- Empty\n"
" end\n"
" function ret:instance(param)\n"
" -- Make id const\n"
" local r = {}\n"
" local id = entityx.create_new_entity(entity_manager_pointer, r)\n"
" r.id = id\n"
" function r:component(name, params)\n"
" return entityx.create_new_component(name, entity_manager_pointer, id, params)\n"
" end\n"
" setmetatable(r, self)\n"
" r:init(param)\n"
" return r\n"
" end\n"
" return ret\n"
" end\n"
" function c:get(id)\n"
" return entityx.get_lua_object(entity_manager_pointer, id)\n"
" end\n"
" return c\n"
"end\n";
}
//TODO replace:entityx_lua:: settable->setfield/rawset
void entityx::lua::setup_entityx_api(lua_State* L)
{
// Create metatables for userdata
// metatable for shared_ptr of EntityManager
lua_newtable(L);
lua_pushstring(L, TypeName_EntityManagerSharedPtr);
lua_setfield(L, -2, "type");
lua_pushcfunction(L, [](lua_State* L){
EntityManagerSharedPtr* ptr = static_cast<EntityManagerSharedPtr*>(lua_touserdata(L, 1));
(*ptr).~EntityManagerSharedPtr();
return 0;
});
lua_setfield(L, -2, "__gc");
ref_EntityManagerSharedPtr = luaL_ref(L, LUA_REGISTRYINDEX);
// metatable for Entity::Id
lua_newtable(L);
lua_pushstring(L, TypeName_EntityId);
lua_setfield(L, -2, "type");
// We don't need __gc for Entity::Id (with static_assert it is_trivially_destructible)
ref_EntityId = luaL_ref(L, LUA_REGISTRYINDEX);
// Create global entityx table
lua_newtable(L);
// create_new_entity
lua_pushcfunction(L, [](lua_State* L){
// First check the type of the parameter
lua_getmetatable(L, 1);
lua_pushstring(L, "type");
lua_rawget(L, -2);
if (!lua_isuserdata(L, 1) || strcmp(lua_tostring(L, -1), TypeName_EntityManagerSharedPtr) != 0 || !lua_istable(L, 2))
{
lua_pushstring(L, "create_new_entity should be called with pointer of EntityManager and a table.");
return lua_error(L);
}
lua_pop(L, 2);
lua_pushvalue(L, 2);
int ref = luaL_ref(L, LUA_REGISTRYINDEX);
// Create an new entity
EntityManagerSharedPtr* ptr = static_cast<EntityManagerSharedPtr*>(lua_touserdata(L, 1));
entityx::Entity entity = (*ptr)->create();
// Save the lua object (ref) in the entity
entity.assign<LuaComponent>(ref);
// Return the Id of the entity
lua_newuserdata(L, sizeof(entityx::Entity::Id));
lua_rawgeti(L, LUA_REGISTRYINDEX, ref_EntityId);
lua_setmetatable(L, -2);
new (lua_touserdata(L, -1)) entityx::Entity::Id(entity.id());
return 1;
});
lua_setfield(L, -2, "create_new_entity");
// get_lua_object
lua_pushcfunction(L, [](lua_State* L){
// First check the type of the parameters
lua_getmetatable(L, 1);
lua_pushstring(L, "type");
lua_rawget(L, -2);
if (!lua_isuserdata(L, 1) || strcmp(lua_tostring(L, -1), TypeName_EntityManagerSharedPtr) != 0)
{
lua_pushstring(L, "get_lua_object should be called with pointer of EntityManager and an EntityId.");
return lua_error(L);
}
lua_pop(L, 2);
lua_getmetatable(L, 2);
lua_pushstring(L, "type");
lua_rawget(L, -2);
if (!lua_isuserdata(L, 2) || strcmp(lua_tostring(L, -1), TypeName_EntityId) != 0)
{
lua_pushstring(L, "get_lua_object should be called with pointer of EntityManager and an EntityId.");
return lua_error(L);
}
lua_pop(L, 2);
// Get the object
EntityManagerSharedPtr* ptr = static_cast<EntityManagerSharedPtr*>(lua_touserdata(L, 1));
entityx::Entity::Id* id = static_cast<entityx::Entity::Id*>(lua_touserdata(L, 2));
entityx::Entity entity = (*ptr)->get(*id);
int ref = entity.component<LuaComponent>()->ref;
lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
return 1;
});
lua_setfield(L, -2, "get_lua_object");
// create_new_component
lua_pushcfunction(L, [](lua_State* L){
ComponentList::iterator i;
//return 0;
if ((i = components.find(std::string(lua_tostring(L, 1)))) != components.end())
{
i->second(L);
}
else
{
lua_pushstring(L, "Component not found.");
return lua_error(L);
}
return 1;
});
lua_setfield(L, -2, "create_new_component");
lua_setglobal(L, "entityx");
luaL_loadstring(L, setup_lua_create_entity_factory);
lua_call(L, 0, 0);
}
void entityx::lua::push_entity_manager(lua_State* L, const EntityManagerSharedPtr& manager)
{
lua_newuserdata(L, sizeof(EntityManagerSharedPtr));
lua_rawgeti(L, LUA_REGISTRYINDEX, ref_EntityManagerSharedPtr);
lua_setmetatable(L, -2);
new (lua_touserdata(L, -1)) EntityManagerSharedPtr(manager);
}
void entityx::lua::new_entity_manager(lua_State* L, const EntityManagerSharedPtr& manager, const char* name)
{
lua_getglobal(L, "entityx");
lua_getfield(L, -1, "create_entity_factory");
lua_remove(L, -2); // _G["entityx"]
push_entity_manager(L, manager);
lua_pcall(L, 1, 1, 1);
lua_getglobal(L, "entityx");
lua_pushvalue(L, -2);
lua_setfield(L, -2, name);
lua_pop(L, 2); // original return value & entityx
}
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