Tutorial Project. Release 6

Written by Victor Yukhtenko. Email: victor@pdc.spb.su

The programs listed below are part of the Evolutions Tutorial Project article.

Game Rules ...

Goal

Demonstrating the properties of Visual Prolog language and simple programming techniques.

Functionality

• The size of the board can be defined;
• Multiple games mode (recommended for computer models only);
• It is possible to create many players, each player with the own strategy:
  • Human (it is not recommended to use in multiple games mode);
  • Computer 1 with the full search (the same as in releases 2,3,4) (not recommended for multiple games);
  • Computer 2 with the easy strategy with the prognosis on K moves forward (the same as in release 5);
• An easy inclusion of new players.

Code

• Tested with Visual Prolog 7.3 build 7302.

• The code is modified to support the new functionality.

Install

To get the full set of projects of the series of the Polyline projects, please download archives using links at PDC forum:

• VipSpbSDK_PE_73_Examples_Polyline_1_14.zip
• VipSpbSDK_PE_73_Tools_Polyline_1_14.zip]

to any convenient directory. The directory named VipSpbSDK will be created automatically.

If you have the VipSpbSDK installed, then please open project Examples\Polyline\Polyline6\Polyline6.prj.

If you do not have the full set of examples from the VipSpbSDK, then please do as follows:

• Create the new project using the interface strategy console
• Build the project
• Replace the content of the file "main.pro" by the code proposed below.
• Build the project again. While building the project please respond “Add All”, when there will be the proposal to include additional packages to the project.

Run

Run the application using the “E” of the IDE or run the executable at the directory EXE.

/****************************************************
Written by Victor Yukhtenko
 
SpbSolutions/Examples/Polyline
 
Predicates, which represent the strategy
    neighbour_nd,
    neighbourOutOfPolyLine_nd,
    stepCandidate
based on solutions proposed by Elena Efimova
Predidcates
    successfulStep
modified
*****************************************************/
/*****************
  GOAL
*****************/
goal
    mainExe::run(main::run).
 
/**************
 Class Main
**************/
implement main
    open core
 
constants
    className = "main".
    classVersion = "1.6".
 
clauses
    classInfo(className, classVersion).
 
clauses
    run():-
        console::init(),   
        game::run().
 
end implement main
 
class game
open core
 
predicates
    classInfo : core::classInfo.
 
properties
    players_V:player*.
    multiMode_V:boolean.
 
predicates
    run:().
end class game
 
implement game
open core
 
constants
    className = "game".
    classVersion = "1.0".
 
clauses
    classInfo(className, classVersion).
 
class facts
    multiMode_V:boolean:=false.
 
clauses
    run():-
        Mode=chooseSingleOrMultiGame(),
        setGameProperties(),
        involvePlayers(),
        if Mode=single_S then 
            playSingle()
        else
            multiMode_V:=true,
            seniourJudge::playMulti()
        end if.
 
domains
    mode_D=
        single_S;
        multi_S.
 
class predicates
    chooseSingleOrMultiGame:()->mode_D GameOrCompetition.
clauses
    chooseSingleOrMultiGame()=Choice:-
        ChoiceStr=humanInterface::getInput(humanInterface::singleOrMulti_S),
        if (string::equalIgnoreCase(ChoiceStr,"S") or ChoiceStr=""),! then
            Choice=single_S,
            !
        else
            Choice=multi_S
        end if.
 
class predicates
    playSingle:().
clauses
    playSingle():-
        StartingPlayer=chooseStartingPlayer(),
        seniourJudge::playSingle(StartingPlayer),
        !,
        playSingle().
    playSingle().
 
class predicates
    setGameProperties:().
clauses
    setGameProperties():-
        juniourJudge::defineStage().
 
/***************************
 Involving Players
***************************/
class facts
    players_V:player*:=[].
 
class predicates
    involvePlayers:().
clauses
    involvePlayers():-
        createPlayers(1).
 
class predicates
    createPlayers:(positive PlayerNo).
clauses
    createPlayers(PlayerNo):-
        humanInterface::announceStartUp(),
        findAll
            (
            PlayerDescriptor,
            (
                playerDescriptor(No,PlayerDescriptorSrc),
                PlayerDescriptor=string::format("% - %\n",No,PlayerDescriptorSrc)
            ),
            PlayerDescriptorList
            ),
        PlayersDescriptor=string::concatList(PlayerDescriptorList),
        PlayerType=humanInterface::getInput
            (
            humanInterface::playerType_S,
            string::format("Possible types of players:\n%s\nPlayer #%s",PlayersDescriptor,toString(PlayerNo))
            ),
        not(PlayerType=""),
        try
            Player=createPlayerObject(toTerm(PlayerType)),
            Player:setName(toString(PlayerNo)),
            players_V:=list::append(players_V,[Player]),
            NewPlayerNo=PlayerNo+1
        catch _TraceID do
            humanInterface::announceSettingsError(humanInterface::errorPlayerType_S),
            NewPlayerNo=PlayerNo
        end try,
        !,
        createPlayers(NewPlayerNo).
    createPlayers(_PlayerNo).
 
/* Potential Players List*/ 
class predicates
    playerDescriptor:(positive No [out],string PlayerDescriptorSrc [out]) multi.
clauses
    playerDescriptor(1,human::playerDescriptor_C).
    playerDescriptor(2,computer1::playerDescriptor_C).
    playerDescriptor(3,computer2::playerDescriptor_C).
 
class predicates
    createPlayerObject:(positive)->player.
clauses
    createPlayerObject(1)=Player:-
        !,
        Player=human::new().
    createPlayerObject(2)=Player:-
        !,
        Player=computer1::new().
    createPlayerObject(3)=Player:-
        !,
        Player=computer2::new().
    createPlayerObject(_)=_Player:-
        exception::raise(classInfo,wrongInputException,[]).
 
class predicates
    wrongInputException:exception.
clauses
    wrongInputException
        (
        classInfo,
        predicate_Name(),
        ""
        ).
 
/***************************
 Shoose Starting Player
***************************/
class predicates
    chooseStartingPlayer:()->player determ.
clauses
    chooseStartingPlayer()=Player:-
        not(players_V=[]) and not(players_V=[_SiglePlayer]),
        findAll(PlayListMember,PlayListMember=playListMember(),PlayList),
        PlayListStr=string::concatList(PlayList),
        StartingPlayer=getStartingPlayerInput(PlayListStr),
        Player=list::nth(StartingPlayer-1,players_V).
 
class predicates
    playListMember:()->string nondeterm.
clauses
    playListMember()=PlayersListMember:-
        I = std::fromTo(1, list::length(game::players_V)),
            Player=list::nth(I-1,game::players_V),
            PlayersListMember=string::format("\n% - %",I,Player:name).
 
class predicates
    getStartingPlayerInput:(string PlayListStr)->positive StartingPlayerNo determ.
clauses
    getStartingPlayerInput(PlayListStr)=StartingPlayer:-
        StartingPlayerStr=humanInterface::getInput(humanInterface::startingPlayer_S,PlayListStr),
        if StartingPlayerStr="" then
            !,
            fail
        else
            try
                StartingPlayer=toTerm(StartingPlayerStr),
                !
            catch _TraceID1 do
                humanInterface::announceSettingsError(humanInterface::errorMustBeNumber_S),
                fail
            end try,
            if StartingPlayer>list::length(players_V) then
                humanInterface::announceSettingsError(humanInterface::errorStartingPlayer_S),
                fail
            end if
        end if.
    getStartingPlayerInput(PlayListStr)=StartingPlayer:-
        StartingPlayer=getStartingPlayerInput(PlayListStr).
 
end implement game
 
/************************
  Class seniorJudge
************************/
class seniourJudge
open core
 
properties
    inProgress_V:boolean.
 
predicates
    playSingle:(player CurrentPlayer).
    playMulti:().
 
end class seniourJudge
 
implement seniourJudge
open core, humanInterface
 
class facts
    inProgress_V:boolean:=false.
 
clauses
    playSingle(Player):-
        inProgress_V=false,
        if game::multiMode_V=false then
            humanInterface::showStage(),
            humanInterface::announceStarter(Player:name)
        end if,
        inProgress_V:=true,
        Player:move(),
        playSingle(Player),
        !.
    playSingle(Player):-
        juniourJudge::isGameOver(),
        !,
        if game::multiMode_V=false then
            Player:announceWin(),
            foreach (Participant=list::getMember_nd(game::players_V) and not(Participant=Player)) do
                Participant:announceLoss()
            end foreach
        else
            addWinner(Player)
        end if,
        inProgress_V:=false,
        juniourJudge::reset().
    playSingle(Player):-
        NextPlayer=nextPlayer(Player),
        NextPlayer:move(),
        !,
        playSingle(NextPlayer).
 
class predicates
    nextPlayer:(player CurrentPlayer)->player NextPlayer.
clauses
    nextPlayer(Player)=NextPlayer:-
        Index=list::tryGetIndex(Player,game::players_V),
        NextPlayer=list::tryGetNth(Index+1,game::players_V),
        !.
    nextPlayer(_Player)=list::nth(0,game::players_V).
 
/************************
  Multi Mode Handle
************************/
class predicates
    defineNoOfRounds:().
clauses
    defineNoOfRounds():-
        InputString=humanInterface::getInput(humanInterface::noOfRounds_S,toString(noOfRounds_V)),
        not(InputString=""),
        try
            noOfRounds_V:=toTerm(InputString)
        catch _TraceID do
            humanInterface::announceSettingsError(humanInterface::errorNoOfRounds_S),
            defineNoOfRounds()
        end try,
        !.
    defineNoOfRounds().
 
class facts
    starter_V:player:=erroneous.
    noOfRounds_V:positive:=10.
    statistics_F:(boolean TrueIfWon,player,positive Won).
 
clauses
    playMulti():-
        defineNoOfRounds(),
        Player=list::getMember_nd(game::players_V),
            starter_V:=Player,
            playRound(noOfRounds_V),
        fail().
    playMulti():-
        humanInterface::reset(),
        PlayersNo=list::length(game::players_V),
        humanInterface::announce
            (
            humanInterface::report_S,
            string::format("\nResults of % games:",toString(PlayersNo*noOfRounds_V))
            ),
        Player=list::getMember_nd(game::players_V),
            PlayerWinsFirst=calculateWins(Player,true),
            PlayerWinsNext=calculateWins(Player,false),
            Report=string::format
                (
                "\nPlayer %:\n\t Wins Total % including:\n\t\tWhile moving first - \t%\n\t\tWhile moving next - \t% ",
                Player:name,
                toString(PlayerWinsFirst+PlayerWinsNext),
                toString(PlayerWinsFirst),
                toString(PlayerWinsNext)
                ),
            humanInterface::announce(humanInterface::report_S,Report),
        fail().
    playMulti():-
        humanInterface::waitOK().
 
class facts
    wins_V:integer:=0.
class predicates
    calculateWins:(player Player,boolean TrueIfFirst)->integer Sum.
clauses
    calculateWins(Player,TrueIfFirst)=_:-
        wins_V:=0,
        statistics_F(TrueIfFirst,Player,Won),
            trap(wins_V:=wins_V+Won,_TraceID,fail),
        fail.
    calculateWins(_Player,_TrueIfFirst)=wins_V.
 
class predicates
    playRound:(positive NoOfRounds).
clauses
    playRound(0):-!.
    playRound(NoOfRounds):-
        seniourJudge::playSingle(starter_V),
        playRound(NoOfRounds-1).
 
class predicates
    addWinner:(player).
clauses
    addWinner(Player):-
        if Player=starter_V then 
            TrueIfStarted=true 
        else
            TrueIfStarted=false 
        end if,
        addWinner(TrueIfStarted,Player).
 
class predicates
    addWinner:(boolean TrueIfStarted,player Player).
clauses
    addWinner(TrueIfStarted,Player):-
        retract(statistics_F(TrueIfStarted,Player,Won)),
        !,
        assert(statistics_F(TrueIfStarted,Player,Won+1)).
    addWinner(TrueIfStarted,Player):-
        assert(statistics_F(TrueIfStarted,Player,1)).
 
end implement seniourJudge
 
/************************
  Class juniourJudge
************************/
class juniourJudge
open core
 
predicates
    classInfo : core::classInfo.
 
domains
    cell = c(positive,positive).
    stepType_D=
        ordinary_S;
        winner_S.
 
properties
    maxRow_P:positive.
    maxColumn_P:positive.
    polyline_P:cell*.
 
predicates
    defineStage:().
    neighbour_nd: (cell,cell) nondeterm (i,o) (i,i).
    neighbourOutOfPolyLine_nd:(cell,cell)->cell nondeterm.
    set: (string ).
    isGameOver:() determ.
    reset:().
 
end class juniourJudge
 
implement juniourJudge
open core, humanInterface
 
constants
    className = "JuniourJudge".
    classVersion = "1.0".
 
clauses
    classInfo(className, classVersion).
 
class facts
    maxRow_P:positive:=6.
    maxColumn_P:positive:=6.
    polyline_P:cell*:=[].
    endOfGame_V:boolean:=false.
 
domains
    fieldSize_D=tableSize(positive X,positive Y).
 
clauses
    defineStage():-
        defineFieldSize().
 
class predicates
    defineFieldSize:().
clauses
    defineFieldSize():-
        InputString=humanInterface::getInput
            (
            humanInterface::fieldSize_S,
            string::format("%s,%s",toString(maxColumn_P),toString(maxRow_P))
            ),
        not(InputString=""),
        try
            hasDomain(fieldSize_D,FieldSize),
            FieldSize=toTerm(string::format("tableSize(%s)",InputString)),
            FieldSize=tableSize(X,Y),
            maxColumn_P:=X,
            maxRow_P:=Y
        catch _TraceID do
            humanInterface::announceSettingsError(humanInterface::errorFieldSize_S),
            defineFieldSize()
        end try,
        !.
    defineFieldSize().
 
clauses
    isGameOver():-
        endOfGame_V=true.
 
clauses
    set(InputString):-
        Cell=toTerm(InputString),
        handleInput (Cell).
 
clauses
    reset():-
        juniourJudge:: polyline_P:=[],
        juniourJudge::endOfGame_V:=false.
 
class predicates
    handleInput:(juniourJudge::cell).
clauses
    handleInput(Cell):-
        list::isMember(Cell,polyline_P),
        try 
            _=makePolyLine(Cell,polyline_P)   % it will be an exception if wrong Cell,
                                                            % but we ignore it by failing
        catch _TraceID do
            fail
        end try,
        !,
        endOfGame_V:=true,
        humanInterface::showStep(Cell,winner_S).
    handleInput (Cell):-
        polyline_P:=makePolyLine(Cell,polyline_P),
        !,
        if game::multiMode_V=false then
            humanInterface::showStep(Cell,ordinary_S)
        end if.
 
class predicates
    makePolyLine: (cell,cell*)-> cell* multi.
clauses
    makePolyLine(c(X,Y),[])=[c(X,Y)]:-
        X>0,X<=maxColumn_P,
        Y>0,Y<=maxRow_P,
        !.
    makePolyLine(NewCell,[SingleCell])=[NewCell,SingleCell]:-
        neighbour_nd(SingleCell, NewCell),
        !.
    makePolyLine(NewCell,[Left, RestrictingCell | PolyLineTail])=[NewCell, Left, RestrictingCell | PolyLineTail]:-
        NewCell=neighbourOutOfPolyLine_nd(Left,RestrictingCell).
    makePolyLine(NewCell,PolyLine)=list::reverse([NewCell,Left, RestrictingCell | PolyLineTail]):-
        [Left, RestrictingCell | PolyLineTail]= list::reverse(PolyLine),
        NewCell=neighbourOutOfPolyLine_nd(Left,RestrictingCell).
    makePolyLine(NewCell,_PolyLine)= _PolyLine1:-
        exception::raise(classInfo,wrongStepException,[namedValue("data",string(toString(NewCell)))]).
 
class predicates
    wrongStepException:exception.
clauses
    wrongStepException
        (
        classInfo,
        predicate_Name(),
        "the point % can not prolong the polyline!"
        ).
 
clauses
    neighbourOutOfPolyLine_nd(Cell,RestrictingCell)=NewCell:-
        neighbour_nd(Cell,NewCell),
            not(NewCell = RestrictingCell).
 
clauses
    neighbour_nd(c(X, Y), c(X + 1, Y)):- X < maxColumn_P.        
    neighbour_nd(c(X, Y), c(X, Y + 1)):- Y < maxrow_P.            
    neighbour_nd(c(X, Y), c(X - 1, Y)):- X > 1.
    neighbour_nd(c(X, Y), c(X, Y - 1)):- Y > 1.    
 
end implement juniourJudge
 
/******************************************
  Interface Player
******************************************/
interface player
 
predicates
    setName:(string).
    move:().
    announceWin:().
    announceLoss:().
 
properties
    name:string.
 
end interface player
 
/******************************************
  Class HumanInterface
******************************************/
class humanInterface
open core
 
predicates
   reset:().
 
predicates
    announceStartUp:().
 
predicates
    waitOK:().
    showStage:().
    showStep:(juniourJudge::cell,juniourJudge::stepType_D).
    getInput:(inputType_D,string StringParameter)->string InputString.
    getInput:(inputType_D)->string InputString.
 
predicates
    announceSettingsError:(choiceError_D).
 
predicates
    announce:(announceID_D AnnounceID,string AnnounceText).
    announceStarter:(string Name).
    announceThinker:(string Name).
    announceWin:(string Name).
    announceLoss:(string Name).
    announceError:(string Description).
    announceError:().
 
domains
    announceID_D=
        report_S;
        starter_S.
 
domains
    choiceError_D=
        errorPlayerType_S;
        errorMustBeNumber_S;
        errorstartingPlayer_S;
        errorFieldSize_S;
        errorNoOfRounds_S.
 
domains
    inputType_D=
        fieldSize_S;
        playerStep_S;
        playerType_S;
        playerName_S;
        startingPlayer_S;
        searchDepth_S;
        noOfRounds_S;
        singleOrMulti_S.
 
end class humanInterface
 
implement humanInterface
open core
 
constants
    cellMarkedOrdinary_C="*".
    cellMarkedWinner_C="O".
 
constants % messages
    thinker_C="% is thinking ...".
    beginner_C="First move done by: %".
    error_C="Error, % ".
    congratulation_C="Player % won!".
    sorryLoss_C="%,  Sorry, you loss :-(".
 
    gameOrCompetition_C="Please choose the mode (S or Enter - single game, other - multiple):".
    fieldSize_C="\nPlease enter the size of the board X,Y (% by default):".
    playerStep_C="Please enter your move as c(X,Y):".
    playerType_C="\n%. Please enter the player type (Enter - end of list):".
    playerName_C="\nPlease assign the name to the player (% proposed):".
    startingPlayer_C="\nWho moves the first (PlayerNo or Enter - end of the game)?:".
    searchDepth_C="\nChoose the depth of the prognosis (% - by default): ".
    noOfRounds_C="\nPlease enter the number of rounds (% by default):".
 
    errorPlayerType_C="\nNo such player type exiasts! Enter - repeat input:".
    errorMustBeNumber_C="\nMust be number! Please repeat input:".
    errorstartingPlayer_C="\nNo such Player exiasts! Please repeat input:".
    errorFieldSize_C="\nWrong size of the board entered! Please repeat input:".
    errorNoOfRounds_C="\nWrong amount of rounds entered! Please repeat input:".
 
constants
    verticalSpace_C=2.
    horizontalSpace_C=3.
    emptyLineLenght_C=80.
 
constants % Position of Line
    starterLine_C=1.
    announceLine_C=starterLine_C+1.
    actionLine_C=announceLine_C+1.
 
clauses
    getInput(InputType)=Input:-
        Input=getInput(InputType,"").
 
    getInput(InputType,StringParameter)=Input:-
        inputInvitation(InputType,StringParameter),
        Input = console::readLine(),
        console::clearInput().
 
class predicates
    inputInvitation:(inputType_D,string StringParameter).
clauses
    inputInvitation(playerStep_S,_StringParameter):-
        clearMessageArea(actionLine_C),
        writeMessage(actionLine_C,"%",playerStep_C).
    inputInvitation(playerName_S,StringParameter):-
        console::writef(playerName_C,StringParameter).
    inputInvitation(playerType_S,StringParameter):-
        console::writef(playerType_C,StringParameter).
    inputInvitation(startingPlayer_S,StringParameter):-
        console::write(StringParameter,startingPlayer_C).
    inputInvitation(searchDepth_S,StringParameter):-
        console::writef(searchDepth_C,StringParameter).
    inputInvitation(fieldSize_S,StringParameter):-
        console::writef(fieldSize_C,StringParameter).
    inputInvitation(noOfRounds_S,StringParameter):-
        console::writef(noOfRounds_C,StringParameter).
    inputInvitation(singleOrMulti_S,_StringParameter):-
        console::write(gameOrCompetition_C).
 
clauses
    showStage():-
        game::multiMode_V=true,
        !.
    showStage():-
        console::clearOutput(),
        foreach I = std::fromTo(1, juniourJudge::maxColumn_P) do
            console::setLocation(console_native::coord(horizontalSpace_C*I, 0)), 
            console::write(I)
        end foreach,
        foreach J = std::fromTo(1, juniourJudge::maxRow_P) do    
            console::setLocation(console_native::coord(0, verticalSpace_C*J)), 
            console::write(J)
        end foreach.
 
clauses
    showStep(_Point,_Type):-
        game::multiMode_V=true,
        !.
    showStep(juniourJudge::c(X,Y),_Type):-
        console::setLocation(console_native::coord(horizontalSpace_C*X, verticalSpace_C*Y)),
        fail.
    showStep(_Cell,juniourJudge::ordinary_S):-
        console::write(cellMarkedOrdinary_C).
    showStep(_Cell,juniourJudge::winner_S):-
        console::write(cellMarkedWinner_C).
 
clauses
    announceStartUp():-
        reset().
 
clauses
    announceStarter(_Name):-
        game::multiMode_V=true,
        !.
    announceStarter(Name):-
        clearMessageArea(starterLine_C),
        writeMessage(starterLine_C,beginner_C,Name).
 
clauses
    announceSettingsError(errorPlayerType_S):-
        console::write(errorPlayerType_C),
        _=console::readLine().
    announceSettingsError(errorMustBeNumber_S):-
        console::write(errorMustBeNumber_C).
    announceSettingsError(errorStartingPlayer_S):-
        console::write(errorStartingPlayer_C).
    announceSettingsError(errorFieldSize_S):-
        console::write(errorFieldSize_C).
    announceSettingsError(errorNoOfRounds_S):-
        console::write(errorNoOfRounds_C).
 
clauses
    announce(report_S,Report):-
        !,
        console::write(Report).
    announce(_AnnounceID,_AnnounceText).
 
clauses
    waitOK():-
        _=console::readLine().
clauses
    announceError():-
        announceError("").
 
    announceError(ErrorText):-
        clearMessageArea(announceLine_C),
        writeMessage(announceLine_C,error_C,ErrorText).
 
clauses
    announceWin(Name):-
        clearMessageArea(announceLine_C),
        clearMessageArea(actionLine_C),
        writeMessage(announceLine_C,congratulation_C,Name),
        _ = console::readLine().
 
    announceLoss(Name):-
        clearMessageArea(announceLine_C),
        clearMessageArea(actionLine_C),
        writeMessage(announceLine_C,sorryLoss_C,Name),
        _ = console::readLine().
 
clauses
    announceThinker(_Name):-
        game::multiMode_V=true,
        !.
    announceThinker(Name):-
        clearMessageArea(announceLine_C),
        clearMessageArea(actionLine_C),
        writeMessage(actionLine_C,thinker_C,Name).
 
clauses
    reset():-
        console::setLocation(console_native::coord(0,0)),
        console::write(string::create(1600," ")),
        console::clearOutput().
 
class predicates
    clearMessageArea:(positive AreaID).
clauses
    clearMessageArea(AreaID):-
        console::setLocation(console_native::coord(0,juniourJudge::maxRow_P*verticalSpace_C+AreaID)),
        console::write(string::create(emptyLineLenght_C," ")).
 
class predicates
    writeMessage:(positive AreaID,string FormatString,string ParameterString).
clauses
    writeMessage(AreaID,FormatString,ParameterString):-
        console::setLocation(console_native::coord(0, juniourJudge::maxRow_P*verticalSpace_C+AreaID)),
        console::writef(FormatString,ParameterString).
 
end implement humanInterface
 
/******************************************
  Class human
******************************************/
class human:player
open core
constants
    playerDescriptor_C="Human: Your strategy".
end class human
 
implement human
open core
 
facts
    name:string:="Hum_".
 
clauses
    setName(ProposedId):-
        name:=string::format("%s%s",name,ProposedId),
        Name=humanInterface::getInput(humanInterface::playerName_S,name),
        if not(Name="") then
            name:=Name
        end if.
 
clauses
    move():-
        InputString=humanInterface::getInput(humanInterface::playerStep_S),
        try
            juniourJudge::set(InputString)
        catch TraceID do
            handleException(TraceID),
            fail
        end try,
        !.
    move():-
        move().
 
clauses
    announceWin():-
        humanInterface::announceWin(name).
 
    announceLoss():-
        humanInterface::announceLoss(name).
 
 
class predicates
    handleException:(exception::traceId TraceID).
clauses
    handleException(TraceID):-
        foreach Descriptor=exception::getDescriptor_nd(TraceID) do
            Descriptor = exception::descriptor(
                _ClassInfo1,
                exception::exceptionDescriptor(_ClassInfo2,_PredicateName,Description),
                _Kind,
                ExtraInfo,
                _GMTTime,
                _ExceptionDescription,
                _ThreadId),
            if
                ExtraInfo=[namedValue("data",string(CellPointer))]
            then
                ErrorMsg=string::format(Description,CellPointer),
                humanInterface::announceError(ErrorMsg)
            else
                humanInterface::announceError("")
            end if
        end foreach.
 
end implement human
 
/************************
  Class GenericComputer
************************/
interface genericComputer
    supports player
    supports polyLineBrain
 
predicates
    setPolyLineBrain:(polyLineBrain).
    stepCandidate: (juniourJudge::cell*,juniourJudge::cell* [out],juniourJudge::cell [out]) nondeterm.
 
end interface genericComputer
 
class genericComputer:genericComputer
open core, exception
 
end class genericComputer
 
implement genericComputer
    delegate interface polyLineBrain to polyLineBrain_V
 
open core
 
facts
    name:string:="Cmp_".
    polyLineBrain_V:polyLineBrain:=erroneous.
 
clauses
    setName(ProposedId):-
        name:=string::format("%s%s",name,ProposedId),
        Name=humanInterface::getInput(humanInterface::playerName_S,name),
        if not(Name="") then
            name:=Name
        end if.
 
clauses
    setPolyLineBrain(PolyLineBrainObject):-
        polyLineBrain_V:=PolyLineBrainObject,
        polyLineBrain_V:setGenericComputer(This).
 
clauses
    move():-
        humanInterface::announceThinker(name),
        Cell=resolveStep(),
        juniourJudge::set(toString(Cell)).
 
predicates
    resolveStep:()->juniourJudge::cell.
clauses
    resolveStep()=Cell:-
        Cell=successfulStep(juniourJudge::polyline_P),
        !.
    resolveStep()=Cell:-
        Cell=randomStep(),
        !.
    resolveStep()=juniourJudge::c(X+1,Y+1):-
        X=math::random(juniourJudge::maxColumn_P-1),
        Y=math::random(juniourJudge::maxRow_P-1).
 
clauses
    stepCandidate([Cell],[Cell,NewCell], NewCell):-
        juniourJudge::neighbour_nd(Cell, NewCell).
    stepCandidate([Left, RestrictingCell | PolyLine],[NewCell,Left, RestrictingCell| PolyLine], NewCell):-
        NewCell=juniourJudge::neighbourOutOfPolyLine_nd(Left,RestrictingCell).
    stepCandidate(PolyLine,list::reverse([NewCell,Left, RestrictingCell |PolyLineTail]),NewCell):-
        [Left, RestrictingCell |PolyLineTail] = list::reverse(PolyLine),
        NewCell=juniourJudge::neighbourOutOfPolyLine_nd(Left,RestrictingCell).
 
clauses
    announceWin():-
        humanInterface::announceWin(name).
 
clauses
    announceLoss():-
        humanInterface::announceLoss(name).
 
end implement genericComputer
 
/******************************************
  Interface PolylineBrain
******************************************/
interface polylineBrain
open core
 
predicates
    setGenericComputer:(genericComputer).
    successfulStep: (juniourJudge::cell*)->juniourJudge::cell nondeterm.
    randomStep:()->juniourJudge::cell determ.
 
end interface polyLineBrain
 
/******************************************
  Class computer1
******************************************/
class computer1:player
open core
 
constants
    playerDescriptor_C=polyLineBrain1::playerDescriptor_C.
 
end class computer1
 
implement computer1
    inherits genericComputer
open core
 
clauses
    new():-
        PolyLineBraneObj=polyLineBrain1::new(),
        setPolyLineBrain(PolyLineBraneObj).
 
end implement computer1
 
/******************************************
  Class PolylineBrain1
******************************************/
class polyLineBrain1:polyLineBrain
open core
predicates
    classInfo : core::classInfo.
 
constants
    playerDescriptor_C="Computer1: The full depth search strategy".
 
end class polyLineBrain1
 
implement polyLineBrain1
open core, exception
 
constants
    className = "polyLineBrain1".
    classVersion = "1.0".
 
clauses
    classInfo(className, classVersion).
 
facts
    genericComputer_V:genericComputer:=erroneous.
 
clauses
    setGenericComputer(GenericComputerObj):-
        genericComputer_V:=GenericComputerObj.
 
clauses
    successfulStep(PolyLine)=BestMove:-
        genericComputer_V:stepCandidate(PolyLine, _PolyLine1,BestMove),
        list::isMember(BestMove, PolyLine),
        !.
    successfulStep(PolyLine)=Cell:-
        genericComputer_V:stepCandidate(PolyLine, PolyLine1,Cell),
            not(_=successfulStep(PolyLine1)).
 
clauses
    randomStep()=Cell:-
        findAll(NewCell,genericComputer_V:stepCandidate(juniourJudge::polyline_P,_Polyline1, NewCell),CellCandidateListWithDuplicates),
        CellCandidateList=list::removeDuplicates(CellCandidateListWithDuplicates),
        not(CellCandidateList=[]),
        NoOfVariants=list::length(CellCandidateList),
        ChoiceNo=math::random(NoOfVariants-1),
        Cell=list::nth(ChoiceNo+1,CellCandidateList).
 
end implement polylineBrain1
 
/******************************************
  Class computer2
******************************************/
class computer2:player
open core
constants
    playerDescriptor_C=polyLineBrain2::playerDescriptor_C.
 
end class computer2
 
implement computer2
    inherits genericComputer
open core
 
clauses
    new():-
        PolyLineBraneObj=polyLineBrain2::new(),
        setPolyLineBrain(PolyLineBraneObj).
 
end implement computer2
 
/******************************************
  Class PolylineBrain2
******************************************/
class polyLineBrain2:polyLineBrain
open core
predicates
    classInfo : core::classInfo.
 
constants
    playerDescriptor_C="Computer2: Easy strategy. The prognosis depth is limited".
 
end class polyLineBrain2
 
implement polyLineBrain2
open core, exception
 
constants
    className = "polyLineBrain2".
    classVersion = "1.0".
 
clauses
    classInfo(className, classVersion).
 
facts
    depth_V:positive:=5.
    genericComputer_V:genericComputer:=erroneous.
 
clauses
    new():-
        defineSearchDepth().
 
clauses
    setGenericComputer(GenericComputerObj):-
        genericComputer_V:=GenericComputerObj.
 
predicates
    defineSearchDepth:().
clauses
    defineSearchDepth():-
        DepthStr=humanInterface::getInput(humanInterface::searchDepth_S,toString(depth_V)),
        not(DepthStr=""),
        !,
        try
            depth_V:=toTerm(DepthStr),
            if depth_V mod 2 = 0 then
                depth_V:=depth_V+1
            end if    
        catch _TraceID1 do
            humanInterface::announceSettingsError(humanInterface::errorMustBeNumber_S),
            defineSearchDepth()
        end try.
    defineSearchDepth().
 
predicates
    successfulStep: (integer Counter, juniourJudge::cell*)->juniourJudge::cell nondeterm.
clauses
    successfulStep(PolyLine)=BestMove:-
        BestMove=successfulStep(depth_V,PolyLine).
 
    successfulStep(Counter,PolyLine)=BestMove:-
        genericComputer_V:stepCandidate(PolyLine,_PolyLine1,BestMove),
        isStepSuccessful(Counter,PolyLine,BestMove),
        !.
    successfulStep(Counter,PolyLine)=Cell:-
        genericComputer_V:stepCandidate(PolyLine, PolyLine1,Cell),
            not(_=successfulStep(Counter-1,PolyLine1)).
 
clauses
    randomStep()=Cell:-
        findAll(NewCell,genericComputer_V:stepCandidate(juniourJudge::polyline_P,_Polyline1, NewCell),CellCandidateListWithDuplicates),
        CellCandidateList=list::removeDuplicates(CellCandidateListWithDuplicates),
        not(CellCandidateList=[]),
        NoOfVariants=list::length(CellCandidateList),
        ChoiceNo=math::random(NoOfVariants-1),
        Cell=list::nth(ChoiceNo+1,CellCandidateList).
 
class predicates
    isStepSuccessful:(integer Counter,juniourJudge::cell* PolyLine,juniourJudge::cell BestMove) determ.
clauses
    isStepSuccessful(_Counter,PolyLine,BestMove):-
        list::isMember(BestMove, PolyLine),
        !.
    isStepSuccessful(Counter,_PolyLine,_BestMove):-
        Counter<=1.
 
end implement polylineBrain2