src/script/api/script_event.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file script_event.cpp Implementation of ScriptEvent. */
   9
  10 #include "../../stdafx.h"
  11 #include "script_event_types.hpp"
  12
  13 #include <queue>
  14
  15 #include "../../safeguards.h"
  16
  17 /** The queue of events for a script. */
  18 struct ScriptEventData {
  19         std::queue<ScriptEvent *> stack; ///< The actual queue.
  20 };
  21
  22 /* static */ void ScriptEventController::CreateEventPointer()
  23 {
  24         assert(ScriptObject::GetEventPointer() == nullptr);
  25
  26         ScriptObject::GetEventPointer() = new ScriptEventData();
  27 }
  28
  29 /* static */ void ScriptEventController::FreeEventPointer()
  30 {
  31         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  32
  33         /* Free all waiting events (if any) */
  34         while (!data->stack.empty()) {
  35                 ScriptEvent *e = data->stack.front();
  36                 data->stack.pop();
  37                 e->Release();
  38         }
  39
  40         /* Now kill our data pointer */
  41         delete data;
  42 }
  43
  44 /* static */ bool ScriptEventController::IsEventWaiting()
  45 {
  46         if (ScriptObject::GetEventPointer() == nullptr) ScriptEventController::CreateEventPointer();
  47         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  48
  49         return !data->stack.empty();
  50 }
  51
  52 /* static */ ScriptEvent *ScriptEventController::GetNextEvent()
  53 {
  54         if (ScriptObject::GetEventPointer() == nullptr) ScriptEventController::CreateEventPointer();
  55         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  56
  57         if (data->stack.empty()) return nullptr;
  58
  59         ScriptEvent *e = data->stack.front();
  60         data->stack.pop();
  61         return e;
  62 }
  63
  64 /* static */ void ScriptEventController::InsertEvent(ScriptEvent *event)
  65 {
  66         if (ScriptObject::GetEventPointer() == nullptr) ScriptEventController::CreateEventPointer();
  67         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  68
  69         event->AddRef();
  70         data->stack.push(event);
  71 }
  72