💿🐜 Antkeeper source code
https://antkeeper.com
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163 lines
5.5 KiB
163 lines
5.5 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "resource-loader.hpp"
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#include "resource-manager.hpp"
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#include "ecs/ebt.hpp"
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#include <nlohmann/json.hpp>
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#include <functional>
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#include <map>
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#include <stdexcept>
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#include <iostream>
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#include <type_traits>
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#include <sstream>
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#include <physfs.h>
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template <class T>
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void parse_argument(T& value, const std::string& string)
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{
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std::istringstream stream(string);
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stream >> value;
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}
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template <>
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void parse_argument(std::string& value, const std::string& string)
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{
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value = string;
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}
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template <class T, class... Args>
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std::function<ecs::ebt::status(ecs::ebt::context&)> pack_function(T (*function)(ecs::ebt::context&, Args...), std::list<std::string> argv)
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{
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//if (argv.size() != sizeof...(Args))
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// Parse list of strings into tuple of arguments
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std::tuple<std::decay_t<Args>...> arguments;
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if constexpr (sizeof...(Args) > 0)
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{
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std::apply([&argv](auto& element, auto&... elements)
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{
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parse_argument(element, argv.front());
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argv.pop_front();
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},
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arguments);
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}
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return std::bind(
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[function, arguments](ecs::ebt::context& context) -> ecs::ebt::status
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{
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return std::apply(function, std::tuple_cat(std::make_tuple(context), arguments));
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},
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std::placeholders::_1);
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}
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static ecs::ebt::node* load_node(const nlohmann::json::const_iterator& json, resource_manager* resource_manager);
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static void load_node_child(ecs::ebt::decorator_node* node, const nlohmann::json& json, resource_manager* resource_manager);
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static void load_node_children(ecs::ebt::composite_node* node, const nlohmann::json& json, resource_manager* resource_manager);
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static ecs::ebt::node* load_action_node(const nlohmann::json& json, resource_manager* resource_manager)
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{
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// Get function name
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auto function_it = json.find("function");
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if (function_it == json.end())
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throw std::runtime_error("load_action_node(): Action node has no function.");
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std::string function_name = function_it.value().get<std::string>();
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// Get argument vector
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std::list<std::string> arguments;
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auto arguments_it = json.find("arguments");
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for (auto it = arguments_it.value().cbegin(); it != arguments_it.value().cend(); ++it)
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arguments.push_back(it.value().get<std::string>());
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ecs::ebt::action* action_node = new ecs::ebt::action();
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if (function_name == "print") action_node->function = pack_function(ecs::ebt::print, arguments);
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else if (function_name == "print_eid") action_node->function = pack_function(ecs::ebt::print_eid, arguments);
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else if (function_name == "warp_to") action_node->function = pack_function(ecs::ebt::warp_to, arguments);
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return action_node;
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}
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static ecs::ebt::node* load_selector_node(const nlohmann::json& json, resource_manager* resource_manager)
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{
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ecs::ebt::selector* selector_node = new ecs::ebt::selector();
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load_node_children(selector_node, json, resource_manager);
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return selector_node;
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}
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static ecs::ebt::node* load_sequence_node(const nlohmann::json& json, resource_manager* resource_manager)
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{
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ecs::ebt::sequence* sequence_node = new ecs::ebt::sequence();
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load_node_children(sequence_node, json, resource_manager);
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return sequence_node;
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}
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static ecs::ebt::node* load_node(const nlohmann::json::const_iterator& json, resource_manager* resource_manager)
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{
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static const std::map<std::string, std::function<ecs::ebt::node*(const nlohmann::json&, ::resource_manager*)>> node_loaders =
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{
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{"action", &load_action_node},
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{"selector", &load_selector_node},
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{"sequence", &load_sequence_node}
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};
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auto node_loader = node_loaders.find(json.key());
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if (node_loader == node_loaders.end())
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{
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throw std::runtime_error("load_node(): Unknown behavior tree node type \"" + json.key() + "\"");
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}
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return node_loader->second(json.value(), resource_manager);
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}
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static void load_node_child(ecs::ebt::decorator_node* node, const nlohmann::json& json, resource_manager* resource_manager)
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{
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auto it = json.find("child");
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node->child = load_node(it.value().cbegin(), resource_manager);
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}
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static void load_node_children(ecs::ebt::composite_node* node, const nlohmann::json& json, resource_manager* resource_manager)
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{
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auto children_it = json.find("children");
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for (auto it = children_it.value().cbegin(); it != children_it.value().cend(); ++it)
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{
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ecs::ebt::node* child = load_node(it.value().begin(), resource_manager);
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node->children.push_back(child);
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}
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}
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template <>
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ecs::ebt::node* resource_loader<ecs::ebt::node>::load(resource_manager* resource_manager, PHYSFS_File* file)
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{
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// Read file into buffer
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std::size_t size = static_cast<int>(PHYSFS_fileLength(file));
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std::string buffer;
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buffer.resize(size);
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PHYSFS_readBytes(file, &buffer[0], size);
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// Parse json from file buffer
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nlohmann::json json = nlohmann::json::parse(buffer);
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if (json.size() != 1)
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{
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throw std::runtime_error("resource_loader<ecs::ebt::node>::load(): Behavior tree must have exactly one root node.");
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}
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return load_node(json.cbegin(), resource_manager);
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}
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