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 //
 // C++ Implementation: cCmdParser
 //
 // Description: command parser
 //
 /*
 Copyright 2005-2011 Tomas Mecir <kmuddy@kmuddy.com>
 
 This program 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; either version 2 of 
 the License, or (at your option) any later version.
 
 This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 // TODO: parts of this are rather ugly, we need to redesign the whole parsing
 
 #include "ccmdparser.h"
 
 #include "caliaslist.h"
 #include "cglobalsettings.h"
 #include "clistmanager.h"
 #include "cprofilesettings.h"
 
 #include <KLocalizedString>
 
 cCmdParser::cCmdParser (int sess)
   : cActionBase ("cmdparser", sess)
 {
   separstr = ";";
   walkstr = ".";
   multistr = "#";
   macrostr = "/";
   noparsestr = "'";
 
   isparsing = true;
   allowemptywalkstr = false;
   stripSpaces = false;
   expandbackslashes = true;
 
   addGlobalEventHandler ("global-settings-changed", 50, PT_NOTHING);
 }
 
 cCmdParser::~cCmdParser()
 {
   removeGlobalEventHandler ("global-settings-changed");
 }
 
 void cCmdParser::eventNothingHandler (QString event, int /*session*/)
 {
   if (event == "global-settings-changed") {
     cGlobalSettings *gs = cGlobalSettings::self();
     setStripSpaces (gs->getBool ("trim-spaces"));
     setCmdSeparatorString (gs->getString ("str-separator"));
     setSpeedWalkString (gs->getString ("str-speedwalk"));
     setMacroString (gs->getString ("str-macro"));
     setMultiCommandString (gs->getString ("str-multi"));
     setNoParseString (gs->getString ("str-noparse"));
     setAllowEmptyWalkStr (gs->getBool ("empty-walk"));
     setExpandBackslashes (gs->getBool ("expand-backslashes"));
   }
 }
 
 void cCmdParser::setCmdSeparatorString (QString str)
 {
   separstr = str.trimmed();
 }
 
 void cCmdParser::setMultiCommandString (QString str)
 {
   multistr = str.trimmed();
 }
 
 void cCmdParser::setSpeedWalkString (QString str)
 {
   walkstr = str.trimmed();
 }
 
 void cCmdParser::setNoParseString (QString str)
 {
   noparsestr = str.trimmed();
 }
 
 void cCmdParser::setMacroString (QString str)
 {
   macrostr = str.trimmed();
 }
 
 void cCmdParser::setAllowEmptyWalkStr (bool val)
 {
   allowemptywalkstr = val;
 }
 
 void cCmdParser::setParsing (bool value)
 {
   isparsing = value;
 }
 
 QStringList cCmdParser::parse (const QString &command, bool expandAliases)
 {
   QStringList result;
 
   // no parsing or empty string- only return what was given
   if ((!isparsing) || command.isEmpty())
   {
     result.append (command);
     return result;
   }
 
   // look whether we should send the text as-is...
   if ((noparsestr.length() > 0) && (command.startsWith (noparsestr)))
   {
     QString t = command.mid (noparsestr.length());
     result.append (markAsRaw (t));
     return result;
   }
 
   // split into individual commands, then process each of them
   QStringList commands = splitIntoCommands (command);
   QStringList::iterator it;
   for (it = commands.begin(); it != commands.end(); ++it) {
     if ((*it).isEmpty())
       // empty command is simply added to the list
       result.append (*it);
     else
       // non-empty command - parse it, then add the results to our list
       result += parseCommand (*it, expandAliases);
   }
 
   return result;
 }
 
 QStringList cCmdParser::parseCommand (const QString &command, bool expandAliases)
 {
   QStringList result, res;
   bool aliasesExpanded = false;
 
   // look if this command should be sent as-is
   if ((noparsestr.length() > 0) && (command.startsWith (noparsestr)))
   {
     QString t = command.mid (noparsestr.length());
     result.append (markAsRaw (t));
     return result;
   }
 
   QString cmd = command;   // we need to modify the command
 
   // first look if there isn't a repeater sequence
   // if not, then repeater keeps original command and returns 1,
   // so we can handle both situations together
   int rep = repeater (cmd);
 
   // perform alias expansion
   if (expandAliases) {
     cList *al = cListManager::self()->getList (sess(), "aliases");
     cAliasList *aliases = al ? dynamic_cast<cAliasList *>(al) : nullptr;
     if (aliases && aliases->matchString (cmd))
     {
       aliasesExpanded = true;
       QStringList cmds = aliases->commandsToExec ();
       QStringList::iterator it;
       for (it = cmds.begin(); it != cmds.end(); ++it)
         // recursive call, but this time no alias expansion will occur
         // (we don't want recursive aliases)
         res += parse (*it, false);
     }
   }
 
   // if we expanded aliases, these things were already done for commands in the list, hence we
   // only do this if no expansion occured
   if (!aliasesExpanded) {
     // expand backslashes
     expandBackslashes (cmd);
 
     // add the command to the list, expanding speed-walk if needed
     int spdpos = isSpeedWalkCommand (cmd);
     if (spdpos != -1)
       res = expandSpeedWalk (cmd, spdpos);
     else
       res.append (cmd);
   }
 
   // return results ...
 
   // only one repeat - return the resulting list
   if (rep == 1) return res;
 
   // more repeats - generate the result, using requested number of repeats
   for (int r = 0; r < rep; r++)
     result += res;
   return result;
 }
 
 static QStringList mergeEscaped (const QStringList &cmds, QString separator)
 {
   // for each command in the list, check if it ends in an odd number of \-s, if it does, and if
   // backslash expansion is allowed, we assume that the user wanted to protect this occurence
   // or command separator from expansion - hence we merge commands back ...
   QStringList cmds2;
   QString command = QString();
   QStringList::const_iterator it;
   for (it = cmds.begin(); it != cmds.end(); ++it)
   {
     command += *it;
     int len = command.length();
     if (!len) continue;
     int cnt = 0;
     if (command[len-1] == '\\') {
       // count trailing \s
       for (int i = 1; i <= len; ++i)
         if (command[len - i] == '\\')
           cnt = i;
         else
           break;
     }
     if (cnt % 2 == 1)
       command += separator;
     else
     {
       cmds2.append (command);
       command = QString();
     }
   }
   if (!command.isEmpty())
     cmds2.append (command);
 
   return cmds2;
 }
 
 QStringList cCmdParser::splitIntoCommands (const QString &text)
 {
   QStringList cmds;
   if (text.length() == 0)
     return cmds;
 
   // split the command, basing on the separator string
   if (separstr.length() > 0)
     cmds = text.split (separstr);
   else
     cmds << text;
   QStringList::iterator it;
 
   // if we don't want to expand backslashes, most further things don't need to be done
 
   if (expandbackslashes) {
     QStringList cmds2 = mergeEscaped (cmds, separstr);
 
     // Now we have a list of commands, but we still need to expand \n separators ...
     cmds.clear ();
     for (it = cmds2.begin(); it != cmds2.end(); ++it)
     {
       // look if there's any "\n" in the string
       if ((*it).indexOf ("\\n") != -1) {
         // there is some \n
         QStringList c = (*it).split ("\\n");
         cmds += mergeEscaped (c, "\\n");
       }
       else {
         // there is no \n
         cmds.append (*it);
       }
     }
   }
 
   // finally, remove leading/trailing spaces from each command, if needed
   if (stripSpaces) {
     QStringList cmds2;
     for (it = cmds.begin(); it != cmds.end(); ++it)
       cmds2.append ((*it).trimmed());
     return cmds2;
   }
 
   return cmds;
 }
 
 bool cCmdParser::mustSendRaw (const QString &command)
 {
     //This is to fix a qt4 empty string crash
     if (command.isEmpty()) return false;
   return (command[0].toLatin1() == 0x01);
 }
 
 QString cCmdParser::fixRaw (const QString &command)
 {
   if (!mustSendRaw (command))
     return command;
   return command.mid (1);
 }
 
 QString cCmdParser::markAsRaw (const QString &command)
 {
   return QChar (0x01) + command;
 }
 
 int cCmdParser::isSpeedWalkCommand (const QString &command)
 {
   bool sw = false;
 
   if ((walkstr.length() > 0) && (command.startsWith (walkstr)))
     sw = true;
 
   //empty walk-string (if allowed)
   if ((walkstr.length() == 0) && allowemptywalkstr)
     sw = true;
 
   int pos = -1;
   if (sw)
   {
     pos = walkstr.length();
     for (int i = pos; i < command.length(); i++)
       switch (command[i].toLatin1()) {
         case ' ':   //spaces are ignored
         case 'n':
         case 'e':
         case 's':
         case 'w':
         case 'h':
         case 'j':
         case 'k':
         case 'l':
         case 'u':
         case 'd':
         case '0':
         case '1':
         case '2':
         case '3':
         case '4':
         case '5':
         case '6':
         case '7':
         case '8':
         case '9': break;
         default: return -1;
       };
   }
   else
     return -1;
 
   //passed all the tests - it's speed-walk command!
   return pos;
 }
 
 QStringList cCmdParser::expandSpeedWalk (const QString &command, int pos)
 {
   //we could have computed the position again, but it would be inefficient
   QStringList list;
   QString cmd;
   bool wascmd;
   int count = 0;
   cProfileSettings *sett = settings();
   QString movecmds[10];
   for (int i = 0; i < 10; ++i)
     movecmds[i] = sett->getString ("movement-command-" + QString::number (i));
   for (int i = pos; i < command.length(); i++)
   {
     wascmd = true;
     switch (command[i].toLatin1()) {
       case 'n': cmd = movecmds[0]; break;
       case 'e': cmd = movecmds[2]; break;
       case 's': cmd = movecmds[4]; break;
       case 'w': cmd = movecmds[6]; break;
       case 'j': cmd = movecmds[1]; break;
       case 'l': cmd = movecmds[3]; break;
       case 'k': cmd = movecmds[5]; break;
       case 'h': cmd = movecmds[7]; break;
       case 'u': cmd = movecmds[8]; break;
       case 'd': cmd = movecmds[9]; break;
       case '0':
       case '1':
       case '2':
       case '3':
       case '4':
       case '5':
       case '6':
       case '7':
       case '8':
       case '9':
         wascmd = false;
         count = count * 10 + (command[i].toLatin1() - '0');
         break;
       case ' ':
         //and spaces are ignored...
         wascmd = false;
         break;
     }
     if (wascmd)
     {
       if (count == 0) count = 1;
       for (int j = 0; j < count; j++)
         list.append (cmd);
       count = 0;
     }
   }
 
   return list;
 }
 
 unsigned int cCmdParser::repeater (QString &command)
 {
   bool multi = false;
   if ((multistr.length() > 0) && (command.startsWith (multistr)))
     multi = true;
 
   if (multi)
   //chance is that there is some repeater
   {
     QString cmd = command;
     cmd.remove (0, multistr.length());
     cmd = cmd.trimmed ();
     QString rep = cmd.section (' ', 0, 0); //first section
     //if rep is a number, then this is a multi-command
     bool ok;
     unsigned int repc = rep.toUInt (&ok);
     if (ok) //GREAT!!! This really is a repeater command!!!
     {
       command = command.section (' ', 1); //everything except the 1st section
 
       //limit repeat count if needed
       cProfileSettings *sett = settings ();
       bool limitRepeats = sett ? sett->getBool ("limit-repeater") : true;
 
       if ((repc > 100) && limitRepeats)
       {
         invokeEvent ("message", sess(), i18n ("Sorry, count is limited to 100.\n"));
         if (sett)
           invokeEvent ("message", sess(),
               i18n ("You can disable this limit in Profile / MUD Preferences."));
         //return 0 - nothing will be sent...
         return 0;
       }
       return repc;
     }
     else       //no repeater here...
       return 1;
   }
   else  //no repeater -> count is 1
     return 1;
 }
 
 bool cCmdParser::isMacroCall (const QString &command, QString &mname, QString &params)
 {
         //This is to fix a qt4 empty string crash
     if (command.isEmpty()) return false;
   bool sc1 = false, sc2 = false;
   if ((macrostr.length() > 0) && (command.startsWith (macrostr)))
     sc1 = true;
   else
     if (expandbackslashes && (command[0].toLatin1() == 0x02))
       sc2 = true;
 
   if (sc1 || sc2)
   {
     QString cmd = command;
     //remove the leading macrostr or 0x02 (\m gets expanded to this)
     if (sc1)
       cmd.remove (0, macrostr.length());
     else
       cmd.remove (0, 1);
     cmd = cmd.trimmed();
     //first word
     mname = cmd.section (' ', 0, 0);
     //everything else
     params = cmd.section (' ', 1);
     params = params.trimmed();
     return true;
   }
   else
     return false;
 }
 
 void cCmdParser::expandBackslashes (QString &command)
 {
   //do nothing if we don't want to expand here
   if (!expandbackslashes)
     return;
 
   QString cmd = "";
 
   bool backslash = false;
   int len = command.length();
   for (int i = 0; i < len; i++)
   {
     QChar ch = command[i];
     if (backslash)
     {
       if (ch.toLatin1() == 't')  //got \t
         cmd += (QChar) '\t';
       else if (ch.toLatin1() == 'e')  //got \e
         cmd += (QChar) '\e';
       else if ((ch.toLatin1() == 'm') && (i == 1))  //got \m on the beginning of the string
         cmd += (QChar) 0x02;
       else
         cmd += ch;
       backslash = false;
     }
     else
     {
       if (ch == QChar ('\\'))
         backslash = true;
       else
         cmd += command[i];
     }
   }
   command = cmd;
 }