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#include <QtCore>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <lua.hpp>
#include <optional>
#include <qvariant.h>
extern "C" {
#include <luv/luv.h>
}
#include "AsyncEventLoop.hpp"
#include "LuaRuntime.hpp"
#include "LuaRuntimeApi.hpp"
LuaRuntime::LuaRuntime() {
state = luaL_newstate();
luaL_openlibs(state);
init_builtins_package_path();
init_web_api();
}
int luv_callback(lua_State *state, int nargs, int nresults, int flags) {
return luv_cfpcall(state, nargs, nresults, flags | LUVF_CALLBACK_NOEXIT);
}
void LuaRuntime::start_event_loop() {
if (event_loop != nullptr)
stop_event_loop();
// Init event loop
event_loop = new AsyncEventLoop();
// Load `uv` (luv)
luv_set_loop(state, event_loop->get_uv_loop());
luv_set_callback(state, &luv_callback);
luaopen_luv(state);
lua_setglobal(state, "uv");
luaL_dostring(state, "web.uv = uv");
}
void LuaRuntime::stop_event_loop() {
if (event_loop != nullptr) {
delete event_loop;
event_loop = nullptr;
}
// Clear the uv global
lua_pushnil(state);
lua_setglobal(state, "uv");
lua_gc(state, LUA_GCCOLLECT, 0);
}
void LuaRuntime::init_web_api() {
luaL_newlib(state, internals_api);
lua_setglobal(state, "__internals");
require_module("null-browser.api");
}
void LuaRuntime::require_module(const QString &module_name) {
preserve_top(state, {
lua_getglobal(state, "require");
lua_pushstring(state, module_name.toStdString().c_str());
if (lua_pcall(state, 1, 0, 0) != LUA_OK) {
qCritical() << "Unable to require module" << module_name << ":" << lua_tostring(state, -1);
}
});
}
void LuaRuntime::init_builtins_package_path() {
auto builtins_lua_path = QString(PROJECT_LUA_PATH);
append_package_path(builtins_lua_path);
}
void LuaRuntime::evaluate(const QString &code) {
queue_task([this, code]() {
preserve_top(state, {
if (luaL_dostring(state, code.toStdString().c_str()) != LUA_OK) {
const char *value = lua_tostring(state, -1);
qDebug() << "Lua Error: " << value;
emit evaluation_failed(value);
} else {
const QVariant value = get_lua_value(state, -1);
emit evaluation_completed(value);
}
})
});
}
void LuaRuntime::append_package_path(const QString &path) {
preserve_top(state, {
lua_getglobal(state, "package");
lua_getfield(state, -1, "path");
auto pkg_path = QString(lua_tostring(state, -1)) + ";" + path;
lua_pop(state, 1);
lua_pushstring(state, pkg_path.toStdString().c_str());
lua_setfield(state, -2, "path");
});
}
void LuaRuntime::load_file_sync(const QString &path) {
preserve_top(state, {
if (luaL_dofile(state, path.toStdString().c_str()) != LUA_OK) {
lua_error(state);
}
});
}
LuaRuntime::~LuaRuntime() {
stop_event_loop();
lua_close(state);
state = nullptr;
}
std::vector<QString> LuaRuntime::lua_tostringlist(lua_State *state) {
std::vector<QString> values;
if (!lua_istable(state, -1))
return values;
lua_pushnil(state); // First key for lua_next()
while (lua_next(state, -2) != 0) {
if (lua_isstring(state, -1))
values.emplace_back(lua_tostring(state, -1));
lua_pop(state, 1);
}
lua_pop(state, 1);
return values;
}
void LuaRuntime::inspect_lua_stack(lua_State *state) {
int top = lua_gettop(state);
qDebug() << "--- Lua Stack (top: " << top << ") ---\n";
for (int i = 1; i <= top; i++) {
int type = lua_type(state, i);
qDebug() << " " << i << ": " << lua_typename(state, type);
}
qDebug() << "---------------------------\n";
lua_settop(state, top);
}
QVariant LuaRuntime::get_lua_value(lua_State *state, int idx, QVariant default_value) {
if (lua_isnoneornil(state, idx))
return default_value;
if (lua_isstring(state, idx))
return lua_tostring(state, idx);
if (lua_isboolean(state, idx))
return lua_toboolean(state, idx);
if (lua_isnumber(state, idx))
return lua_tonumber(state, idx);
return lua_tostring(state, idx);
}
void LuaRuntime::push_qvariant(lua_State *state, std::optional<QVariant> opt) {
if (!opt.has_value()) {
lua_pushnil(state);
return;
}
auto type = QString(opt.value().typeName());
// qDebug() << type << opt.value();
// TODO: QVariantMap
// TODO: QVariantList
if (type == "") {
lua_pushnil(state);
return;
}
if (type == "bool") {
lua_pushboolean(state, opt.value().toBool());
return;
}
if (type == "int") {
lua_pushinteger(state, opt.value().toInt());
return;
}
if (type == "double") {
lua_pushnumber(state, opt.value().toDouble());
return;
}
// String default
lua_pushstring(state, opt.value().toString().toStdString().c_str());
}
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