mirror of https://github.com/OpenTTD/OpenTTD.git
107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
/*
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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 "../../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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SQInteger 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<bool>::Set(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<HSQOBJECT>::Set(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<HSQOBJECT>::Set(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<bool>::Set(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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