Add Settings interface for Lua

1 files changed, 216 insertions, 0 deletions

diff --git a/src/script/lua_api/l_settings.cpp b/src/script/lua_api/l_settings.cpp
new file mode 100644
index 000000000..13a88ee95
--- /dev/null
+++ b/src/script/lua_api/l_settings.cpp
@@ -0,0 +1,216 @@
+/*
+Minetest
+Copyright (C) 2013 PilzAdam <pilzadam@minetest.net>
+
+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 "lua_api/l_settings.h"
+#include "lua_api/l_internal.h"
+#include "settings.h"
+#include "log.h"
+
+// garbage collector
+int LuaSettings::gc_object(lua_State* L)
+{
+	LuaSettings* o = *(LuaSettings **)(lua_touserdata(L, 1));
+	delete o;
+	return 0;
+}
+
+// get(self, key) -> value
+int LuaSettings::l_get(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	std::string key = std::string(luaL_checkstring(L, 2));
+	if (o->m_settings->exists(key)) {
+		std::string value = o->m_settings->get(key);
+		lua_pushstring(L, value.c_str());
+	} else {
+		lua_pushnil(L);
+	}
+
+	return 1;
+}
+
+// get_bool(self, key) -> boolean
+int LuaSettings::l_get_bool(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	std::string key = std::string(luaL_checkstring(L, 2));
+	if (o->m_settings->exists(key)) {
+		bool value = o->m_settings->getBool(key);
+		lua_pushboolean(L, value);
+	} else {
+		lua_pushnil(L);
+	}
+
+	return 1;
+}
+
+// set(self, key, value)
+int LuaSettings::l_set(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	std::string key = std::string(luaL_checkstring(L, 2));
+	const char* value = luaL_checkstring(L, 3);
+
+	o->m_settings->set(key, value);
+
+	return 1;
+}
+
+// remove(self, key) -> success
+int LuaSettings::l_remove(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	std::string key = std::string(luaL_checkstring(L, 2));
+
+	bool success = o->m_settings->remove(key);
+	lua_pushboolean(L, success);
+
+	return 1;
+}
+
+// get_names(self) -> {key1, ...}
+int LuaSettings::l_get_names(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	std::vector<std::string> keys = o->m_settings->getNames();
+
+	lua_newtable(L);
+	for (unsigned int i=0; i < keys.size(); i++)
+	{
+		lua_pushstring(L, keys[i].c_str());
+		lua_rawseti(L, -2, i + 1);
+	}
+
+	return 1;
+}
+
+// write(self) -> success
+int LuaSettings::l_write(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	bool success = o->m_settings->updateConfigFile(o->m_filename.c_str());
+	lua_pushboolean(L, success);
+
+	return 1;
+}
+
+// to_table(self) -> {[key1]=value1,...}
+int LuaSettings::l_to_table(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	LuaSettings* o = checkobject(L, 1);
+
+	std::vector<std::string> keys = o->m_settings->getNames();
+
+	lua_newtable(L);
+	for (unsigned int i=0; i < keys.size(); i++)
+	{
+		lua_pushstring(L, o->m_settings->get(keys[i]).c_str());
+		lua_setfield(L, -2, keys[i].c_str());
+	}
+
+	return 1;
+}
+
+LuaSettings::LuaSettings(const char* filename)
+{
+	m_filename = std::string(filename);
+
+	m_settings = new Settings();
+	m_settings->readConfigFile(m_filename.c_str());
+}
+
+LuaSettings::~LuaSettings()
+{
+	delete m_settings;
+}
+
+void LuaSettings::Register(lua_State* L)
+{
+	lua_newtable(L);
+	int methodtable = lua_gettop(L);
+	luaL_newmetatable(L, className);
+	int metatable = lua_gettop(L);
+
+	lua_pushliteral(L, "__metatable");
+	lua_pushvalue(L, methodtable);
+	lua_settable(L, metatable);  // hide metatable from Lua getmetatable()
+
+	lua_pushliteral(L, "__index");
+	lua_pushvalue(L, methodtable);
+	lua_settable(L, metatable);
+
+	lua_pushliteral(L, "__gc");
+	lua_pushcfunction(L, gc_object);
+	lua_settable(L, metatable);
+
+	lua_pop(L, 1);  // drop metatable
+
+	luaL_openlib(L, 0, methods, 0);  // fill methodtable
+	lua_pop(L, 1);  // drop methodtable
+
+	// Can be created from Lua (Settings(filename))
+	lua_register(L, className, create_object);
+}
+
+// LuaSettings(filename)
+// Creates an LuaSettings and leaves it on top of stack
+int LuaSettings::create_object(lua_State* L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	const char* filename = luaL_checkstring(L, 1);
+	LuaSettings* o = new LuaSettings(filename);
+	*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
+	luaL_getmetatable(L, className);
+	lua_setmetatable(L, -2);
+	return 1;
+}
+
+LuaSettings* LuaSettings::checkobject(lua_State* L, int narg)
+{
+	NO_MAP_LOCK_REQUIRED;
+	luaL_checktype(L, narg, LUA_TUSERDATA);
+	void *ud = luaL_checkudata(L, narg, className);
+	if(!ud) luaL_typerror(L, narg, className);
+	return *(LuaSettings**)ud;  // unbox pointer
+}
+
+const char LuaSettings::className[] = "Settings";
+const luaL_reg LuaSettings::methods[] = {
+	luamethod(LuaSettings, get),
+	luamethod(LuaSettings, get_bool),
+	luamethod(LuaSettings, set),
+	luamethod(LuaSettings, remove),
+	luamethod(LuaSettings, get_names),
+	luamethod(LuaSettings, write),
+	luamethod(LuaSettings, to_table),
+	{0,0}
+};