74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
/*
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Minetest
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Copyright (C) 2018 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "helper.h"
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#include <cmath>
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#include <sstream>
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#include "c_types.h"
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bool LuaHelper::isNaN(lua_State *L, int idx)
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{
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return lua_type(L, idx) == LUA_TNUMBER && std::isnan(lua_tonumber(L, idx));
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}
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/*
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* Read template functions
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*/
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template <> bool LuaHelper::readParam(lua_State *L, int index)
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{
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return lua_toboolean(L, index) != 0;
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}
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template <> bool LuaHelper::readParam(lua_State *L, int index, const bool &default_value)
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{
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if (lua_isnil(L, index))
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return default_value;
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return lua_toboolean(L, index) != 0;
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}
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template <> float LuaHelper::readParam(lua_State *L, int index)
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{
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if (isNaN(L, index))
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throw LuaError("NaN value is not allowed.");
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return (float)luaL_checknumber(L, index);
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}
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template <> std::string LuaHelper::readParam(lua_State *L, int index)
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{
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std::string result;
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const char *str = luaL_checkstring(L, index);
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result.append(str);
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return result;
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}
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template <>
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std::string LuaHelper::readParam(
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lua_State *L, int index, const std::string &default_value)
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{
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std::string result;
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const char *str = lua_tostring(L, index);
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if (str)
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result.append(str);
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else
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result = default_value;
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return result;
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}
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