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#include "LuaBindingsInternal.hpp"
using namespace Config::Lua::Bindings;
static constexpr const char* DISPATCHER_MT = "HL.Dispatcher";
static char DISPATCHER_TABLES_REGISTRY_KEY;
namespace {
struct SDispatcherRef {
int ref = LUA_NOREF;
};
}
static int dispatcherGc(lua_State* L) {
auto* dispatcher = sc<SDispatcherRef*>(luaL_checkudata(L, 1, DISPATCHER_MT));
if (dispatcher->ref != LUA_NOREF) {
luaL_unref(L, LUA_REGISTRYINDEX, dispatcher->ref);
dispatcher->ref = LUA_NOREF;
}
return 0;
}
static int dispatcherCall(lua_State* L) {
return Internal::configError(L, "dispatcher objects cannot be called directly; use hl.dispatch(dispatcher)");
}
static int dispatcherToString(lua_State* L) {
lua_pushstring(L, "HL.Dispatcher");
return 1;
}
static void ensureDispatcherMetatable(lua_State* L) {
if (luaL_newmetatable(L, DISPATCHER_MT)) {
lua_pushcfunction(L, dispatcherGc);
lua_setfield(L, -2, "__gc");
lua_pushcfunction(L, dispatcherCall);
lua_setfield(L, -2, "__call");
lua_pushcfunction(L, dispatcherToString);
lua_setfield(L, -2, "__tostring");
lua_pushstring(L, DISPATCHER_MT);
lua_setfield(L, -2, "__metatable");
}
lua_pop(L, 1);
}
static bool isDispatcherTable(lua_State* L, int idx) {
if (!lua_istable(L, idx))
return false;
idx = lua_absindex(L, idx);
lua_pushlightuserdata(L, &DISPATCHER_TABLES_REGISTRY_KEY);
lua_rawget(L, LUA_REGISTRYINDEX);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return false;
}
lua_pushvalue(L, idx);
lua_rawget(L, -2);
const bool result = lua_toboolean(L, -1);
lua_pop(L, 2);
return result;
}
static int dispatcherFactory(lua_State* L) {
const int nargs = lua_gettop(L);
lua_pushvalue(L, lua_upvalueindex(1));
lua_insert(L, 1);
lua_call(L, nargs, LUA_MULTRET);
const int nresults = lua_gettop(L);
if (nresults == 1 && lua_isfunction(L, -1))
return Internal::wrapDispatcher(L);
return nresults;
}
void Internal::setFn(lua_State* L, const char* name, lua_CFunction fn) {
if (isDispatcherTable(L, -1)) {
lua_pushcfunction(L, fn);
lua_pushcclosure(L, dispatcherFactory, 1);
} else
lua_pushcfunction(L, fn);
lua_setfield(L, -2, name);
}
void Internal::markDispatcherTable(lua_State* L) {
if (!lua_istable(L, -1))
return;
lua_pushlightuserdata(L, &DISPATCHER_TABLES_REGISTRY_KEY);
lua_rawget(L, LUA_REGISTRYINDEX);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
lua_newtable(L);
lua_pushlightuserdata(L, &DISPATCHER_TABLES_REGISTRY_KEY);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX);
}
lua_pushvalue(L, -2);
lua_pushboolean(L, true);
lua_rawset(L, -3);
lua_pop(L, 1);
}
int Internal::wrapDispatcher(lua_State* L) {
luaL_checktype(L, -1, LUA_TFUNCTION);
const int ref = luaL_ref(L, LUA_REGISTRYINDEX);
new (lua_newuserdata(L, sizeof(SDispatcherRef))) SDispatcherRef{.ref = ref};
ensureDispatcherMetatable(L);
luaL_getmetatable(L, DISPATCHER_MT);
lua_setmetatable(L, -2);
return 1;
}
bool Internal::pushDispatcherFunction(lua_State* L, int idx) {
if (lua_isfunction(L, idx)) {
lua_pushvalue(L, idx);
return true;
}
auto* dispatcher = sc<SDispatcherRef*>(luaL_testudata(L, idx, DISPATCHER_MT));
if (!dispatcher || dispatcher->ref == LUA_NOREF)
return false;
lua_rawgeti(L, LUA_REGISTRYINDEX, dispatcher->ref);
if (lua_isfunction(L, -1))
return true;
lua_pop(L, 1);
return false;
}
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