Add: [Script] Native priority queue; useful e.g. for pathfinders.
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/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* THIS FILE IS AUTO-GENERATED; PLEASE DO NOT ALTER MANUALLY */
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#include "../script_priorityqueue.hpp"
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#include "../template/template_priorityqueue.hpp.sq"
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template <> const char *GetClassName<ScriptPriorityQueue, ST_AI>() { return "AIPriorityQueue"; }
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void SQAIPriorityQueue_Register(Squirrel *engine)
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{
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DefSQClass<ScriptPriorityQueue, ST_AI> SQAIPriorityQueue("AIPriorityQueue");
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SQAIPriorityQueue.PreRegister(engine);
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SQAIPriorityQueue.AddConstructor<void (ScriptPriorityQueue::*)(), 1>(engine, "x");
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SQAIPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Insert, "Insert");
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SQAIPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Pop, "Pop");
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SQAIPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Peek, "Peek");
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SQAIPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Exists, "Exists");
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SQAIPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Clear, "Clear");
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SQAIPriorityQueue.DefSQMethod(engine, &ScriptPriorityQueue::IsEmpty, "IsEmpty", 1, "x");
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SQAIPriorityQueue.DefSQMethod(engine, &ScriptPriorityQueue::Count, "Count", 1, "x");
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SQAIPriorityQueue.PostRegister(engine);
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}
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/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* THIS FILE IS AUTO-GENERATED; PLEASE DO NOT ALTER MANUALLY */
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#include "../script_priorityqueue.hpp"
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#include "../template/template_priorityqueue.hpp.sq"
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template <> const char *GetClassName<ScriptPriorityQueue, ST_GS>() { return "GSPriorityQueue"; }
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void SQGSPriorityQueue_Register(Squirrel *engine)
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{
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DefSQClass<ScriptPriorityQueue, ST_GS> SQGSPriorityQueue("GSPriorityQueue");
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SQGSPriorityQueue.PreRegister(engine);
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SQGSPriorityQueue.AddConstructor<void (ScriptPriorityQueue::*)(), 1>(engine, "x");
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SQGSPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Insert, "Insert");
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SQGSPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Pop, "Pop");
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SQGSPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Peek, "Peek");
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SQGSPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Exists, "Exists");
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SQGSPriorityQueue.DefSQAdvancedMethod(engine, &ScriptPriorityQueue::Clear, "Clear");
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SQGSPriorityQueue.DefSQMethod(engine, &ScriptPriorityQueue::IsEmpty, "IsEmpty", 1, "x");
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SQGSPriorityQueue.DefSQMethod(engine, &ScriptPriorityQueue::Count, "Count", 1, "x");
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SQGSPriorityQueue.PostRegister(engine);
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}
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/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file script_priorityqueue.cpp Implementation of ScriptPriorityQueue. */
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#include "../../stdafx.h"
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#include "script_priorityqueue.hpp"
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#include "script_error.hpp"
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#include "../squirrel_helper.hpp"
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#include "../script_instance.hpp"
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#include "../../debug.h"
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#include <algorithm>
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#include "../../safeguards.h"
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static bool operator==(const ScriptPriorityQueue::PriorityItem &lhs, const HSQOBJECT &rhs)
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{
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return lhs.second._type == rhs._type && lhs.second._unVal.raw == rhs._unVal.raw;
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}
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ScriptPriorityQueue::~ScriptPriorityQueue()
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{
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/* Release reference to stored objects. */
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auto inst = ScriptObject::GetActiveInstance();
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if (!inst->InShutdown()) {
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for (auto &i : this->queue) inst->ReleaseSQObject(const_cast<HSQOBJECT *>(&i.second));
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}
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}
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SQInteger ScriptPriorityQueue::Insert(HSQUIRRELVM vm)
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{
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HSQOBJECT item;
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int64 priority;
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sq_resetobject(&item);
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sq_getstackobj(vm, 2, &item);
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sq_getinteger(vm, 3, &priority);
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sq_addref(vm, &item); // Keep object alive.
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this->queue.emplace_back(priority, item);
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std::push_heap(this->queue.begin(), this->queue.end(), this->comp);
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return SQConvert::Return(vm, true);
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}
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SQInteger ScriptPriorityQueue::Pop(HSQUIRRELVM vm)
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{
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if (this->IsEmpty()) {
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ScriptObject::SetLastError(ScriptError::ERR_PRECONDITION_FAILED);
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sq_pushnull(vm);
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return 1;
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}
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HSQOBJECT item = this->queue.front().second;
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std::pop_heap(this->queue.begin(), this->queue.end(), this->comp);
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this->queue.pop_back();
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/* Store the object on the Squirrel stack before releasing it to make sure the ref count can't drop to zero. */
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auto ret = SQConvert::Return(vm, item);
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sq_release(vm, &item);
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return ret;
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}
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SQInteger ScriptPriorityQueue::Peek(HSQUIRRELVM vm)
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{
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if (this->IsEmpty()) {
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ScriptObject::SetLastError(ScriptError::ERR_PRECONDITION_FAILED);
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sq_pushnull(vm);
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return 1;
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}
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return SQConvert::Return(vm, this->queue.front().second);
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}
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SQInteger ScriptPriorityQueue::Exists(HSQUIRRELVM vm)
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{
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HSQOBJECT item;
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sq_resetobject(&item);
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sq_getstackobj(vm, 2, &item);
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return SQConvert::Return(vm, std::find(this->queue.cbegin(), this->queue.cend(), item) != this->queue.cend());
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}
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SQInteger ScriptPriorityQueue::Clear(HSQUIRRELVM vm)
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{
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/* Release reference to stored objects. */
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for (auto &i : this->queue) sq_release(vm, const_cast<HSQOBJECT *>(&i.second));
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this->queue.clear();
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return 0;
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}
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bool ScriptPriorityQueue::IsEmpty()
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{
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return this->queue.empty();
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}
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SQInteger ScriptPriorityQueue::Count()
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{
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return (SQInteger)this->queue.size();
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}
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@ -0,0 +1,94 @@
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/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file script_priorityqueue.hpp A queue that keeps a list of items sorted by a priority. */
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/** @defgroup ScriptPriorityQueue Classes that create a priority queue of items. */
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#ifndef SCRIPT_PRIORITYQUEUE_HPP
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#define SCRIPT_PRIORITYQUEUE_HPP
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#include "script_object.hpp"
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#include <utility>
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#include <vector>
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/**
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* Class that creates a queue which keeps its items ordered by an item priority.
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* @api ai game
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*/
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class ScriptPriorityQueue : public ScriptObject {
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public:
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typedef std::pair<int64, HSQOBJECT> PriorityItem;
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private:
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struct PriorityComparator {
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bool operator()(const PriorityItem &lhs, const PriorityItem &rhs) const noexcept
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{
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return lhs.first > rhs.first;
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}
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};
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PriorityComparator comp;
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std::vector<PriorityItem> queue; ///< The priority list
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public:
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~ScriptPriorityQueue();
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#ifdef DOXYGEN_API
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/**
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* Add a single item to the queue.
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* @param item The item to add. Can be any Squirrel type. Should be unique, otherwise it is ignored.
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* @param priority The priority to assign the item.
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* @return True if the item was inserted, false if it was already in the queue.
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*/
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bool Insert(void *item, int64 priority);
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/**
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* Remove and return the item with the lowest priority.
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* @return The item with the lowest priority, removed from the queue. Returns null on an empty queue.
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* @pre !IsEmpty()
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*/
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void *Pop();
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/**
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* Get the item with the lowest priority, keeping it in the queue.
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* @return The item with the lowest priority. Returns null on an empty queue.
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* @pre !IsEmpty()
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*/
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void *Peek();
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/**
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* Check if an items is already included in the queue.
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* @return true if the items is already in the queue.
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* @note Performance is O(n), use only when absolutely required.
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*/
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bool Exists(void *item);
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/**
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* Clear the queue, making Count() returning 0 and IsEmpty() returning true.
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*/
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void Clear();
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#else
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SQInteger Insert(HSQUIRRELVM vm);
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SQInteger Pop(HSQUIRRELVM vm);
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SQInteger Peek(HSQUIRRELVM vm);
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SQInteger Exists(HSQUIRRELVM vm);
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SQInteger Clear(HSQUIRRELVM vm);
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#endif
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/**
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* Check if the queue is empty.
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* @return true if the queue is empty.
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*/
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bool IsEmpty();
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/**
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* Returns the amount of items in the queue.
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* @return amount of items in the queue.
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*/
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SQInteger Count();
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};
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#endif /* SCRIPT_PRIORITYQUEUE_HPP */
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/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* THIS FILE IS AUTO-GENERATED; PLEASE DO NOT ALTER MANUALLY */
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#include "../script_priorityqueue.hpp"
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namespace SQConvert {
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/* Allow ScriptPriorityQueue to be used as Squirrel parameter */
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template <> inline ScriptPriorityQueue *GetParam(ForceType<ScriptPriorityQueue *>, HSQUIRRELVM vm, int index, SQAutoFreePointers *ptr) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return (ScriptPriorityQueue *)instance; }
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template <> inline ScriptPriorityQueue &GetParam(ForceType<ScriptPriorityQueue &>, HSQUIRRELVM vm, int index, SQAutoFreePointers *ptr) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return *(ScriptPriorityQueue *)instance; }
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template <> inline const ScriptPriorityQueue *GetParam(ForceType<const ScriptPriorityQueue *>, HSQUIRRELVM vm, int index, SQAutoFreePointers *ptr) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return (ScriptPriorityQueue *)instance; }
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template <> inline const ScriptPriorityQueue &GetParam(ForceType<const ScriptPriorityQueue &>, HSQUIRRELVM vm, int index, SQAutoFreePointers *ptr) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return *(ScriptPriorityQueue *)instance; }
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template <> inline int Return<ScriptPriorityQueue *>(HSQUIRRELVM vm, ScriptPriorityQueue *res) { if (res == nullptr) { sq_pushnull(vm); return 1; } res->AddRef(); Squirrel::CreateClassInstanceVM(vm, "PriorityQueue", res, nullptr, DefSQDestructorCallback<ScriptPriorityQueue>, true); return 1; }
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} // namespace SQConvert
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