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author | Loïc Blot <nerzhul@users.noreply.github.com> | 2018-06-30 17:11:38 +0200 |
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committer | GitHub <noreply@github.com> | 2018-06-30 17:11:38 +0200 |
commit | eef62c82a2e58700fc1216b0b8c03e421bc77995 (patch) | |
tree | 4c49e659069036cb53d69535dc33d33f29d963f4 /src/script/common/helper.cpp | |
parent | 227c71eb76e019873b30e2d3893b68307d51d58f (diff) | |
download | minetest-eef62c82a2e58700fc1216b0b8c03e421bc77995.tar.gz minetest-eef62c82a2e58700fc1216b0b8c03e421bc77995.tar.bz2 minetest-eef62c82a2e58700fc1216b0b8c03e421bc77995.zip |
Modernize lua read (part 2 & 3): C++ templating assurance (#7410)
* Modernize lua read (part 2 & 3): C++ templating assurance
Implement the boolean reader
Implement the string reader
Also remove unused & unimplemented script_error_handler
Add a reader with default value
Diffstat (limited to 'src/script/common/helper.cpp')
-rw-r--r-- | src/script/common/helper.cpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/script/common/helper.cpp b/src/script/common/helper.cpp new file mode 100644 index 000000000..9adc56a65 --- /dev/null +++ b/src/script/common/helper.cpp @@ -0,0 +1,73 @@ +/* +Minetest +Copyright (C) 2018 nerzhul, Loic Blot <loic.blot@unix-experience.fr> + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU Lesser General Public License as published by +the Free Software Foundation; either version 2.1 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; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU Lesser General Public License for more details. + +You should have received a copy of the GNU Lesser General Public License along +with this program; if not, write to the Free Software Foundation, Inc., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +*/ + +#include "helper.h" +#include <cmath> +#include <sstream> +#include "c_types.h" + +bool LuaHelper::isNaN(lua_State *L, int idx) +{ + return lua_type(L, idx) == LUA_TNUMBER && std::isnan(lua_tonumber(L, idx)); +} + +/* + * Read template functions + */ +template <> bool LuaHelper::readParam(lua_State *L, int index) +{ + return lua_toboolean(L, index) != 0; +} + +template <> bool LuaHelper::readParam(lua_State *L, int index, const bool &default_value) +{ + if (lua_isnil(L, index)) + return default_value; + + return lua_toboolean(L, index) != 0; +} + +template <> float LuaHelper::readParam(lua_State *L, int index) +{ + if (isNaN(L, index)) + throw LuaError("NaN value is not allowed."); + + return (float)luaL_checknumber(L, index); +} + +template <> std::string LuaHelper::readParam(lua_State *L, int index) +{ + std::string result; + const char *str = luaL_checkstring(L, index); + result.append(str); + return result; +} + +template <> +std::string LuaHelper::readParam( + lua_State *L, int index, const std::string &default_value) +{ + std::string result; + const char *str = lua_tostring(L, index); + if (str) + result.append(str); + else + result = default_value; + return result; +} |