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add lua_kernel_base as a super class of game_lua_kernel
This class holds some "basic" initialization and methods that we would want in any lua kernel. It is not pure virtual, it could be instantiated.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* | ||
| Copyright (C) 2014 by Chris Beck <render787@gmail.com> | ||
| Part of the Battle for Wesnoth Project http://www.wesnoth.org/ | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY. | ||
| See the COPYING file for more details. | ||
| */ | ||
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| #include "scripting/lua_kernel_base.hpp" | ||
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| #include "global.hpp" | ||
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| #include "log.hpp" | ||
| #include "lua/lauxlib.h" | ||
| #include "lua/lua.h" | ||
| #include "lua/lualib.h" | ||
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| #ifdef DEBUG_LUA | ||
| #include "scripting/debug_lua.hpp" | ||
| #endif | ||
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| #include "scripting/lua_api.hpp" | ||
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| #include <cstring> | ||
| #include <string> | ||
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| static lg::log_domain log_scripting_lua("scripting/lua"); | ||
| #define LOG_LUA LOG_STREAM(info, log_scripting_lua) | ||
| #define WRN_LUA LOG_STREAM(warn, log_scripting_lua) | ||
| #define ERR_LUA LOG_STREAM(err, log_scripting_lua) | ||
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| lua_kernel_base::lua_kernel_base() | ||
| : mState(luaL_newstate()) | ||
| { | ||
| lua_State *L = mState; | ||
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| // Open safe libraries. | ||
| // Debug and OS are not, but most of their functions will be disabled below. | ||
| static const luaL_Reg safe_libs[] = { | ||
| { "", luaopen_base }, | ||
| { "table", luaopen_table }, | ||
| { "string", luaopen_string }, | ||
| { "math", luaopen_math }, | ||
| { "debug", luaopen_debug }, | ||
| { "os", luaopen_os }, | ||
| { NULL, NULL } | ||
| }; | ||
| for (luaL_Reg const *lib = safe_libs; lib->func; ++lib) | ||
| { | ||
| luaL_requiref(L, lib->name, lib->func, 1); | ||
| lua_pop(L, 1); /* remove lib */ | ||
| } | ||
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| // Disable functions from os which we don't want. | ||
| lua_getglobal(L, "os"); | ||
| lua_pushnil(L); | ||
| while(lua_next(L, -2) != 0) { | ||
| lua_pop(L, 1); | ||
| char const* function = lua_tostring(L, -1); | ||
| if(strcmp(function, "clock") == 0 || strcmp(function, "date") == 0 | ||
| || strcmp(function, "time") == 0 || strcmp(function, "difftime") == 0) continue; | ||
| lua_pushnil(L); | ||
| lua_setfield(L, -3, function); | ||
| } | ||
| lua_pop(L, 1); | ||
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| // Disable functions from debug which we don't want. | ||
| lua_getglobal(L, "debug"); | ||
| lua_pushnil(L); | ||
| while(lua_next(L, -2) != 0) { | ||
| lua_pop(L, 1); | ||
| char const* function = lua_tostring(L, -1); | ||
| if(strcmp(function, "traceback") == 0) continue; | ||
| lua_pushnil(L); | ||
| lua_setfield(L, -3, function); | ||
| } | ||
| lua_pop(L, 1); | ||
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| lua_settop(L, 0); | ||
| } | ||
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| lua_kernel_base::~lua_kernel_base() | ||
| { | ||
| lua_close(mState); | ||
| } | ||
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| /** | ||
| * Runs a script on a stack containing @a nArgs arguments. | ||
| * @return true if the script was successful and @a nRets return values are available. | ||
| */ | ||
| bool lua_kernel_base::execute(char const *prog, int nArgs, int nRets) | ||
| { | ||
| lua_State *L = mState; | ||
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| // Compile script into a variadic function. | ||
| int res = luaL_loadstring(L, prog); | ||
| if (res) | ||
| { | ||
| char const *m = lua_tostring(L, -1); | ||
| chat_message("Lua error", m); | ||
| ERR_LUA << m << '\n'; | ||
| lua_pop(L, 1); | ||
| return false; | ||
| } | ||
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| // Place the function before its arguments. | ||
| if (nArgs) | ||
| lua_insert(L, -1 - nArgs); | ||
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| return luaW_pcall(L, nArgs, nRets); | ||
| } | ||
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| /** | ||
| * Loads the "package" package into the Lua environment. | ||
| * This action is inherently unsafe, as Lua scripts will now be able to | ||
| * load C libraries on their own, hence granting them the same privileges | ||
| * as the Wesnoth binary itsef. | ||
| */ | ||
| void lua_kernel_base::load_package() | ||
| { | ||
| lua_State *L = mState; | ||
| lua_pushcfunction(L, luaopen_package); | ||
| lua_pushstring(L, "package"); | ||
| lua_call(L, 1, 0); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /* | ||
| Copyright (C) 2014 by Chris Beck <render787@gmail.com> | ||
| Part of the Battle for Wesnoth Project http://www.wesnoth.org/ | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY. | ||
| See the COPYING file for more details. | ||
| */ | ||
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| #ifndef SCRIPTING_LUA_KERNEL_BASE_HPP | ||
| #define SCRIPTING_LUA_KERNEL_BASE_HPP | ||
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| #include <string> // for string | ||
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| struct lua_State; | ||
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| class lua_kernel_base { | ||
| protected: | ||
| lua_State *mState; | ||
| bool execute(char const *, int, int); | ||
| public: | ||
| lua_kernel_base(); | ||
| ~lua_kernel_base(); | ||
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| /** Runs a plain script. */ | ||
| void run(char const *prog) { execute(prog, 0, 0); } | ||
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| void load_package(); | ||
| }; | ||
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| #endif |