The Battle for Wesnoth  1.17.4+dev
lua_preferences.cpp
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1 /*
2  Copyright (C) 2016 - 2022
3  by Jyrki Vesterinen <sandgtx@gmail.com>
4  Part of the Battle for Wesnoth Project https://www.wesnoth.org/
5 
6  This program is free software; you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation; either version 2 of the License, or
9  (at your option) any later version.
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY.
12 
13  See the COPYING file for more details.
14 */
15 
17 
18 #include "config.hpp"
19 #include "lua/lauxlib.h"
20 #include "preferences/general.hpp"
21 #include "scripting/lua_common.hpp"
22 
23 /**
24  * The __index metamethod.
25  * Parameter 1: the preference table.
26  * Parameter 2: preference name, must be a string.
27  * Returns: preference value. If there isn't such a preference, returns nil.
28  */
29 static int impl_preferences_get(lua_State* L)
30 {
31  std::string preference_name = luaL_checkstring(L, 2);
33  return 1;
34 }
35 
36 /**
37  * The __newindex metamethod.
38  * Parameter 1: the preference table.
39  * Parameter 2: preference name, must be a string.
40  * Parameter 3: preference value.
41  * Returns nothing.
42  */
43 static int impl_preferences_set(lua_State* L)
44 {
45  std::string preference_name = luaL_checkstring(L, 2);
47  luaW_toscalar(L, 3, value);
48  preferences::set(preference_name, value);
49  return 0;
50 }
51 
52 namespace lua_preferences
53 {
54  std::string register_table(lua_State* L)
55  {
56  // Push the wesnoth table to the stack
57  lua_getglobal(L, "wesnoth");
58 
59  // Create the preferences table
60  lua_newtable(L);
61  lua_pushcfunction(L, impl_preferences_get);
62  lua_setfield(L, -2, "__index");
63  lua_pushcfunction(L, impl_preferences_set);
64  lua_setfield(L, -2, "__newindex");
65  lua_pushstring(L, "src/scripting/lua_preferences.cpp");
66  lua_setfield(L, -2, "__metatable");
67 
68  // Set the table as its own metatable
69  lua_pushvalue(L, -1);
70  lua_setmetatable(L, -2);
71 
72  // Assign the table to wesnoth.preferences
73  lua_setfield(L, -2, "preferences");
74 
75  // Pop the wesnoth table from the stack
76  lua_pop(L, 1);
77 
78  return "Adding preferences table...\n";
79  }
80 }
Variant for storing WML attributes.
void set(const std::string &key, bool value)
Definition: general.cpp:167
Definitions for the interface to Wesnoth Markup Language (WML).
void luaW_pushscalar(lua_State *L, const config::attribute_value &v)
Converts an attribute value into a Lua object pushed at the top of the stack.
Definition: lua_common.cpp:569
static int impl_preferences_get(lua_State *L)
The __index metamethod.
config::attribute_value get_as_attribute(const std::string &key)
Definition: general.cpp:228
static int impl_preferences_set(lua_State *L)
The __newindex metamethod.
std::string register_table(lua_State *L)
bool luaW_toscalar(lua_State *L, int index, config::attribute_value &v)
Converts the value at the top of the stack to an attribute value.
Definition: lua_common.cpp:574