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Merge pull request #104 from AnonymousProgrammerLandau/enableUseOfExc…
…eptions Enable use of exceptions
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| #pragma once | ||
| #include <functional> | ||
| #include "primitives.h" | ||
| #include <string> | ||
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|
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| extern "C" { | ||
| #include <lua.h> | ||
| #include <lauxlib.h> | ||
| } | ||
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| namespace sel { | ||
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| struct stored_exception { | ||
| std::string what; | ||
| std::exception_ptr exception; | ||
| }; | ||
|
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| inline std::string const * _stored_exception_metatable_name() { | ||
| static std::string const name = "selene_stored_exception"; | ||
| return &name; | ||
| } | ||
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| inline int _delete_stored_exception(lua_State * l) { | ||
| void * user_data = lua_touserdata(l, -1); | ||
| static_cast<stored_exception *>(user_data)->~stored_exception(); | ||
| return 0; | ||
| } | ||
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| inline int _push_stored_exceptions_what(lua_State * l) { | ||
| void * user_data = lua_touserdata(l, -1); | ||
| std::string const & what = static_cast<stored_exception *>(user_data)->what; | ||
| detail::_push(l, what); | ||
| return 1; | ||
| } | ||
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| inline void _register_stored_exception_metatable(lua_State * l) { | ||
| luaL_newmetatable(l, _stored_exception_metatable_name()->c_str()); | ||
| lua_pushcfunction(l, _delete_stored_exception); | ||
| lua_setfield(l, -2, "__gc"); | ||
| lua_pushcclosure(l, _push_stored_exceptions_what, 0); | ||
| lua_setfield(l, -2, "__tostring"); | ||
| } | ||
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| inline void store_current_exception(lua_State * l, char const * what) { | ||
| void * user_data = lua_newuserdata(l, sizeof(stored_exception)); | ||
| new(user_data) stored_exception{what, std::current_exception()}; | ||
|
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| luaL_getmetatable(l, _stored_exception_metatable_name()->c_str()); | ||
| if(lua_isnil(l, -1)) { | ||
| lua_settop(l, -2); | ||
| _register_stored_exception_metatable(l); | ||
| } | ||
|
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| lua_setmetatable(l, -2); | ||
| } | ||
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| inline stored_exception * test_stored_exception(lua_State *l) { | ||
| if(lua_isuserdata(l, -1)) { | ||
| void * user_data = luaL_testudata(l, -1, _stored_exception_metatable_name()->c_str()); | ||
| if(user_data != nullptr) { | ||
| return static_cast<stored_exception *>(user_data); | ||
| } | ||
| } | ||
| return nullptr; | ||
| } | ||
|
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| inline bool push_stored_exceptions_what(lua_State * l) { | ||
| stored_exception * stored = test_stored_exception(l); | ||
| if(stored != nullptr) { | ||
| detail::_push(l, static_cast<const std::string &>(stored->what)); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
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| inline std::exception_ptr extract_stored_exception(lua_State *l) { | ||
| stored_exception * stored = test_stored_exception(l); | ||
| if(stored != nullptr) { | ||
| return stored->exception; | ||
| } | ||
| return nullptr; | ||
| } | ||
|
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| class ExceptionHandler { | ||
| public: | ||
| using function = std::function<void(int,std::string,std::exception_ptr)>; | ||
|
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| private: | ||
| function _handler; | ||
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| public: | ||
| ExceptionHandler() = default; | ||
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| explicit ExceptionHandler(function && handler) : _handler(handler) {} | ||
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| void Handle(int luaStatusCode, std::string message, std::exception_ptr exception = nullptr) { | ||
| if(_handler) { | ||
| _handler(luaStatusCode, std::move(message), std::move(exception)); | ||
| } | ||
| } | ||
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| void Handle_top_of_stack(int luaStatusCode, lua_State *L) { | ||
| stored_exception * stored = test_stored_exception(L); | ||
| if(stored) { | ||
| Handle( | ||
| luaStatusCode, | ||
| stored->what, | ||
| stored->exception); | ||
| } else { | ||
| Handle( | ||
| luaStatusCode, | ||
| detail::_pop(detail::_id<std::string>(), L)); | ||
| } | ||
| } | ||
|
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| }; | ||
|
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| } |
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