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#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include <fstream>
#include <iostream>
int main(int, char*[]) {
std::cout << "=== running lua code (safely) ==="
<< std::endl;
{
std::ofstream out("a_lua_script.lua");
out << "print('hi from a lua script file')";
}
sol::state lua;
lua.open_libraries(sol::lib::base);
// load and execute from string
auto result = lua.safe_script(
"a = 'test'", sol::script_pass_on_error);
if (!result.valid()) {
sol::error err = result;
std::cerr << "The code has failed to run!\n"
<< err.what() << "\nPanicking and exiting..."
<< std::endl;
return 1;
}
// load and execute from file
auto script_from_file_result = lua.safe_script_file(
"a_lua_script.lua", sol::script_pass_on_error);
if (!script_from_file_result.valid()) {
sol::error err = script_from_file_result;
std::cerr
<< "The code from the file has failed to run!\n"
<< err.what() << "\nPanicking and exiting..."
<< std::endl;
return 1;
}
// run a script, get the result
sol::optional<int> maybe_value = lua.safe_script(
"return 54", sol::script_pass_on_error);
SOL_ASSERT(maybe_value.has_value());
SOL_ASSERT(*maybe_value == 54);
auto bad_code_result = lua.safe_script(
"123 herp.derp", sol::script_pass_on_error);
SOL_ASSERT(!bad_code_result.valid());
// you can also specify a handler function, and it'll
// properly work here
auto bad_code_result2 = lua.script("123 herp.derp",
[](lua_State*, sol::protected_function_result pfr) {
// pfr will contain things that went wrong, for
// either loading or executing the script Can
// throw your own custom error You can also just
// return it, and let the call-site handle the
// error if necessary.
return pfr;
});
// it did not work
SOL_ASSERT(!bad_code_result2.valid());
// the default handler panics or throws, depending on your
// settings uncomment for explosions: auto bad_code_result_2
// = lua.script("bad.code", &sol::script_default_on_error);
std::cout << std::endl;
{ std::remove("a_lua_script.lua"); }
return 0;
}
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