src/script/api/script_event.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file script_event.cpp Implementation of ScriptEvent. */
  11
  12 #include "../../stdafx.h"
  13 #include "script_event_types.hpp"
  14
  15 #include <queue>
  16
  17 #include "../../safeguards.h"
  18
  19 /** The queue of events for a script. */
  20 struct ScriptEventData {
  21         std::queue<ScriptEvent *> stack; ///< The actual queue.
  22 };
  23
  24 /* static */ void ScriptEventController::CreateEventPointer()
  25 {
  26         assert(ScriptObject::GetEventPointer() == NULL);
  27
  28         ScriptObject::GetEventPointer() = new ScriptEventData();
  29 }
  30
  31 /* static */ void ScriptEventController::FreeEventPointer()
  32 {
  33         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  34
  35         /* Free all waiting events (if any) */
  36         while (!data->stack.empty()) {
  37                 ScriptEvent *e = data->stack.front();
  38                 data->stack.pop();
  39                 e->Release();
  40         }
  41
  42         /* Now kill our data pointer */
  43         delete data;
  44 }
  45
  46 /* static */ bool ScriptEventController::IsEventWaiting()
  47 {
  48         if (ScriptObject::GetEventPointer() == NULL) ScriptEventController::CreateEventPointer();
  49         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  50
  51         return !data->stack.empty();
  52 }
  53
  54 /* static */ ScriptEvent *ScriptEventController::GetNextEvent()
  55 {
  56         if (ScriptObject::GetEventPointer() == NULL) ScriptEventController::CreateEventPointer();
  57         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  58
  59         if (data->stack.empty()) return NULL;
  60
  61         ScriptEvent *e = data->stack.front();
  62         data->stack.pop();
  63         return e;
  64 }
  65
  66 /* static */ void ScriptEventController::InsertEvent(ScriptEvent *event)
  67 {
  68         if (ScriptObject::GetEventPointer() == NULL) ScriptEventController::CreateEventPointer();
  69         ScriptEventData *data = (ScriptEventData *)ScriptObject::GetEventPointer();
  70
  71         event->AddRef();
  72         data->stack.push(event);
  73 }
  74