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/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file script_priorityqueue.cpp Implementation of ScriptPriorityQueue. */
#include "../../stdafx.h"
#include "script_priorityqueue.hpp"
#include "script_error.hpp"
#include "../squirrel_helper.hpp"
#include "../script_instance.hpp"
#include "../../debug.h"
#include <algorithm>
#include "../../safeguards.h"
static bool operator==(const ScriptPriorityQueue::PriorityItem &lhs, const HSQOBJECT &rhs)
{
return lhs.second._type == rhs._type && lhs.second._unVal.raw == rhs._unVal.raw;
}
ScriptPriorityQueue::~ScriptPriorityQueue()
{
/* Release reference to stored objects. */
auto inst = ScriptObject::GetActiveInstance();
if (!inst->InShutdown()) {
for (auto &i : this->queue) inst->ReleaseSQObject(const_cast<HSQOBJECT *>(&i.second));
}
}
SQInteger ScriptPriorityQueue::Insert(HSQUIRRELVM vm)
{
HSQOBJECT item;
int64 priority;
sq_resetobject(&item);
sq_getstackobj(vm, 2, &item);
sq_getinteger(vm, 3, &priority);
sq_addref(vm, &item); // Keep object alive.
this->queue.emplace_back(priority, item);
std::push_heap(this->queue.begin(), this->queue.end(), this->comp);
return SQConvert::Return(vm, true);
}
SQInteger ScriptPriorityQueue::Pop(HSQUIRRELVM vm)
{
if (this->IsEmpty()) {
ScriptObject::SetLastError(ScriptError::ERR_PRECONDITION_FAILED);
sq_pushnull(vm);
return 1;
}
HSQOBJECT item = this->queue.front().second;
std::pop_heap(this->queue.begin(), this->queue.end(), this->comp);
this->queue.pop_back();
/* Store the object on the Squirrel stack before releasing it to make sure the ref count can't drop to zero. */
auto ret = SQConvert::Return(vm, item);
sq_release(vm, &item);
return ret;
}
SQInteger ScriptPriorityQueue::Peek(HSQUIRRELVM vm)
{
if (this->IsEmpty()) {
ScriptObject::SetLastError(ScriptError::ERR_PRECONDITION_FAILED);
sq_pushnull(vm);
return 1;
}
return SQConvert::Return(vm, this->queue.front().second);
}
SQInteger ScriptPriorityQueue::Exists(HSQUIRRELVM vm)
{
HSQOBJECT item;
sq_resetobject(&item);
sq_getstackobj(vm, 2, &item);
return SQConvert::Return(vm, std::find(this->queue.cbegin(), this->queue.cend(), item) != this->queue.cend());
}
SQInteger ScriptPriorityQueue::Clear(HSQUIRRELVM vm)
{
/* Release reference to stored objects. */
for (auto &i : this->queue) sq_release(vm, const_cast<HSQOBJECT *>(&i.second));
this->queue.clear();
return 0;
}
bool ScriptPriorityQueue::IsEmpty()
{
return this->queue.empty();
}
SQInteger ScriptPriorityQueue::Count()
{
return (SQInteger)this->queue.size();
}
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