Line data    Source code

       1             : /* Copyright (C) 2010 Wildfire Games.
       2             :  * This file is part of 0 A.D.
       3             :  *
       4             :  * 0 A.D. is free software: you can redistribute it and/or modify
       5             :  * it under the terms of the GNU General Public License as published by
       6             :  * the Free Software Foundation, either version 2 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * 0 A.D. is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             :  * GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License
      15             :  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
      16             :  */
      17             : 
      18             : #include "precompiled.h"
      19             : 
      20             : #include "CommandProc.h"
      21             : 
      22             : #include <cassert>
      23             : #include <algorithm>
      24             : 
      25             : //////////////////////////////////////////////////////////////////////////
      26             : 
      27           0 : template<typename T> T next_it(T x) { T t = x; return ++t; }
      28             : 
      29           0 : template<typename T> void delete_fn(T* v) { delete v; }
      30             : 
      31             : //////////////////////////////////////////////////////////////////////////
      32             : 
      33             : using namespace AtlasMessage;
      34             : 
      35             : namespace AtlasMessage {
      36             : 
      37           0 :     CommandProc& GetCommandProc()
      38             :     {
      39           0 :         static CommandProc commandProc;
      40           0 :         return commandProc;
      41             :     }
      42             : 
      43           0 :     cmdHandlers& GetCmdHandlers()
      44             :     {
      45           0 :         static cmdHandlers h;
      46           0 :         return h;
      47             :     }
      48             : }
      49             : 
      50             : 
      51           0 : CommandProc::CommandProc()
      52             : {
      53             :     // Start the list with a NULL, so m_CurrentCommand can point at
      54             :     // something even when the command stack is empty
      55           0 :     m_Commands.push_back(NULL);
      56             : 
      57           0 :     m_CurrentCommand = m_Commands.begin();
      58           0 : }
      59             : 
      60           0 : CommandProc::~CommandProc()
      61             : {
      62             :     // Make sure Destroy has been called before now (to avoid
      63             :     // problems from the destruction order of static variables)
      64           0 :     ENSURE(!m_Commands.size());
      65           0 : }
      66             : 
      67           0 : void CommandProc::Destroy()
      68             : {
      69           0 :     std::for_each(m_Commands.begin(), m_Commands.end(), delete_fn<Command>);
      70           0 :     m_Commands.clear();
      71           0 : }
      72             : 
      73           0 : void CommandProc::Submit(Command* cmd)
      74             : {
      75             :     // If some commands have been undone at the time we insert this new one,
      76             :     // delete and remove them all.
      77           0 :     std::for_each(next_it(m_CurrentCommand), m_Commands.end(), delete_fn<Command>);
      78           0 :     m_Commands.erase(next_it(m_CurrentCommand), m_Commands.end());
      79           0 :     assert(next_it(m_CurrentCommand) == m_Commands.end());
      80             : 
      81           0 :     m_CurrentCommand = m_Commands.insert(next_it(m_CurrentCommand), cmd);
      82             : 
      83           0 :     (*m_CurrentCommand)->Do();
      84           0 : }
      85             : 
      86           0 : void CommandProc::Undo()
      87             : {
      88           0 :     if (m_CurrentCommand != m_Commands.begin())
      89             :     {
      90           0 :         (*m_CurrentCommand)->Undo();
      91           0 :         --m_CurrentCommand;
      92             :     }
      93           0 : }
      94             : 
      95           0 : void CommandProc::Redo()
      96             : {
      97           0 :     if (next_it(m_CurrentCommand) != m_Commands.end())
      98             :     {
      99           0 :         ++m_CurrentCommand;
     100           0 :         (*m_CurrentCommand)->Redo();
     101             :     }
     102           0 : }
     103             : 
     104           0 : void CommandProc::Merge()
     105             : {
     106           0 :     if (m_CurrentCommand == m_Commands.begin())
     107             :     {
     108           0 :         debug_warn(L"Merge illogic: no commands");
     109           0 :         return;
     110             :     }
     111             : 
     112           0 :     if (next_it(m_CurrentCommand) != m_Commands.end())
     113             :     {
     114           0 :         debug_warn(L"Merge illogic: not at stack top");
     115           0 :         return;
     116             :     }
     117             : 
     118           0 :     cmdIt prev = m_CurrentCommand;
     119           0 :     --prev;
     120             : 
     121           0 :     if (prev == m_Commands.begin())
     122             :     {
     123           0 :         debug_warn(L"Merge illogic: only 1 command");
     124           0 :         return;
     125             :     }
     126             : 
     127           0 :     if ((*prev)->GetType() != (*m_CurrentCommand)->GetType())
     128             :     {
     129           0 :         const char* a = (*prev)->GetType();
     130           0 :         const char* b = (*m_CurrentCommand)->GetType();
     131           0 :         debug_printf("[incompatible: %s -> %s]\n", a, b);
     132           0 :         debug_warn(L"Merge illogic: incompatible command");
     133           0 :         return;
     134             :     }
     135             : 
     136           0 :     (*m_CurrentCommand)->Merge(*prev);
     137             : 
     138           0 :     delete *m_CurrentCommand;
     139           0 :     m_Commands.erase(m_CurrentCommand);
     140             : 
     141           0 :     m_CurrentCommand = prev;
     142             : }