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#include "luacxx.hpp"
extern "C" {
#include <lauxlib.h>
#include <lualib.h>
}
namespace getsuyomi {
using fud::FudStatus;
LuaContext::LuaContext()
{
m_state = luaL_newstate();
if (m_state != nullptr) {
luaL_openlibs(m_state);
}
}
LuaContext::~LuaContext()
{
if (m_state != nullptr) {
lua_close(m_state);
m_state = nullptr;
}
}
LuaContext::LuaContext(LuaContext&& rhs) : m_state{rhs.m_state}
{
rhs.m_state = nullptr;
}
LuaContext& LuaContext::operator=(LuaContext&& rhs)
{
m_state = rhs.m_state;
rhs.m_state = nullptr;
return *this;
}
FudStatus LuaContext::loadFile(const char* filename)
{
if (!valid())
{
return FudStatus::ObjectInvalid;
}
if (luaL_loadfile(m_state, filename) || lua_pcall(m_state, 0, 0, 0)) {
return FudStatus::Failure;
}
return FudStatus::Success;
}
LuaResult<int64_t> LuaContext::getGlobalInteger(const char* name)
{
if (m_state == nullptr) {
return LuaResult<int64_t>::error(FudStatus::ObjectInvalid);
}
int isNumber{};
int64_t result{};
auto luaType = lua_getglobal(m_state, name);
// discard luaType since isNumber will check if variable is integral
static_cast<void>(luaType);
result = lua_tointegerx(m_state, -1, &isNumber);
lua_pop(m_state, 1);
if (!static_cast<bool>(isNumber)) {
return LuaResult<int64_t>::error(FudStatus::Failure);
}
return LuaResult<int64_t>::okay(result);
}
LuaResult<const char*> LuaContext::getGlobalString(const char* name)
{
if (m_state == nullptr) {
return LuaResult<const char*>::error(FudStatus::ObjectInvalid);
}
size_t length;
const char* result{nullptr};
auto luaType = lua_getglobal(m_state, name);
static_cast<void>(luaType);
result = lua_tolstring(m_state, -1, &length);
lua_pop(m_state, 1);
if (result == nullptr) {
return LuaResult<const char*>::error(FudStatus::Failure);
}
return LuaResult<const char*>::okay(result);
}
LuaResult<std::vector<std::string>> LuaContext::getGlobalStringArray(const char* name)
{
using RetType = LuaResult<std::vector<std::string>>;
if (m_state == nullptr) {
return RetType::error(FudStatus::ObjectInvalid);
}
auto luaType = lua_getglobal(m_state, name);
static_cast<void>(luaType);
if (!lua_istable(m_state, -1)) {
lua_pop(m_state, 1);
return RetType::error(FudStatus::Failure);
}
int64_t length;
int isNumber{};
lua_len(m_state, -1);
length = lua_tointegerx(m_state, -1, &isNumber);
lua_pop(m_state, 1);
if (!static_cast<bool>(isNumber) || length < 0) {
lua_pop(m_state, 1);
return RetType::error(FudStatus::Failure);
}
std::vector<std::string> output{};
output.reserve(static_cast<size_t>(length));
for (int64_t index = 1; index <= length; ++index) {
const char* result{nullptr};
lua_pushinteger(m_state, index);
static_cast<void>(lua_gettable(m_state, -2));
result = lua_tolstring(m_state, -1, nullptr);
if (result == nullptr) {
lua_pop(m_state, 1);
return RetType::error(FudStatus::Failure);
}
output.emplace_back(result);
}
lua_pop(m_state, 1);
return RetType::okay(output);
}
} // namespace getsuyomi
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