lua_object.cpp

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/*
    Copyright (C) 2011 - 2025
    by Dmitry Kovalenko <nephro.wes@gmail.com>
    Part of the Battle for Wesnoth Project https://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.
*/
 
/**
 * @file
 * Lua object(code) wrapper implementation
 */
 
#include "ai/lua/lua_object.hpp"
#include "ai/default/aspect_attacks.hpp"
#include "scripting/lua_common.hpp"
 
#include "lua/wrapper_lauxlib.h"
 
namespace ai {
 
    lua_object_base::lua_object_base()
    {
        // empty
    }
 
    // MSVC fails to compile without this line
    template class lua_object<aspect_attacks_lua_filter>;
 
    template <>
    std::shared_ptr<aspect_attacks_lua_filter> lua_object<aspect_attacks_lua_filter>::to_type(lua_State *L, int n)
    {
        std::shared_ptr<aspect_attacks_lua_filter> att(new aspect_attacks_lua_filter);
        att->lua = nullptr;
        att->ref_own_ = att->ref_enemy_ = -1;
        if(!lua_istable(L, n)) {
            return att;
        }
        lua_getfield(L, n, "own");
        if(lua_istable(L, -1)) {
            vconfig vcfg(config(), true);
            if(luaW_tovconfig(L, -1, vcfg)) {
                att->filter_own_.reset(new unit_filter(vcfg));
            }
        } else if(lua_isfunction(L, -1)) {
            att->lua = L;
            att->ref_own_ = luaL_ref(L, LUA_REGISTRYINDEX);
            assert(att->ref_own_ != -1);
        }
        lua_getfield(L, n, "enemy");
        if(lua_istable(L, -1)) {
            vconfig vcfg(config(), true);
            if(luaW_tovconfig(L, -1, vcfg)) {
                att->filter_enemy_.reset(new unit_filter(vcfg));
            }
        } else if(lua_isfunction(L, -1)) {
            att->lua = L;
            att->ref_enemy_ = luaL_ref(L, LUA_REGISTRYINDEX);
            assert(att->ref_enemy_ != -1);
        }
        lua_pop(L, 2);
        return att;
    }
 
} //end of namespace ai