djmil/corda-checkers
djmil/corda-checkers
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move: mandatory capture

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This commit is contained in:
djmil 2023-09-29 13:59:34 +02:00
parent 7d26dca752
commit 8affa353da
3 changed files with 47 additions and 4 deletions
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2
backend/src/test/java/djmil/cordacheckers/CheckersMoveTest.java
View File

@ -21,7 +21,7 @@ public class CheckersMoveTest {
Map.entry(2, Arrays.asList(6, 7, 9, 11)),
Map.entry(3, Arrays.asList(7, 8, 10, 12)),
Map.entry(4, Arrays.asList(8, 11)),
Map.entry(5, Arrays.asList(1, 9, 14, 9, 11)),
Map.entry(5, Arrays.asList(1, 9, 14)),
Map.entry(6, Arrays.asList(1, 2, 9, 10, 13, 15)),
Map.entry(7, Arrays.asList(2, 3, 10, 11, 14, 16)),
Map.entry(8, Arrays.asList(3, 4, 11, 12, 15)),

16
backend/src/test/java/djmil/cordacheckers/cordaclient/GameBoardTests.java
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@ -110,6 +110,22 @@ public class GameBoardTests {
assertThat(m2.board().get(15)).isEqualTo(BLACK_MAN);
assertThat(m2.moveNumber() == 2);
assertThat(m2.status()).isEqualByComparingTo(Status.GAME_BOARD_WAIT_FOR_OPPONENT);
assertThatThrownBy(() -> {
cordaClient.gameBoardMove(hiWhite, game.uuid(), move(24, 19),
"An attempt to ignore mandatory capture");
});
final var m3 = cordaClient.gameBoardMove(hiWhite, game.uuid(), move(18, 11), null);
assertThat(m2.board().get(18)).isEqualTo(WHITE_MAN);
assertThat(m2.board().get(11)).isNull();
assertThat(m2.board().get(15)).isEqualTo(BLACK_MAN);
assertThat(m3.board().get(11)).isEqualTo(WHITE_MAN);
assertThat(m3.board().get(18)).isNull();
assertThat(m3.board().get(15)).isNull();
assertThat(m3.moveNumber() == 3);
assertThat(m3.status()).isEqualByComparingTo(Status.GAME_BOARD_WAIT_FOR_OPPONENT);
}
ArrayList<Integer> move(int from, int to) {

33
corda/contracts/src/main/java/djmil/cordacheckers/checkers/Move.java
View File

@ -42,7 +42,9 @@ public class Move {
if (!allMoves.contains(this))
throw new Exception("Prohibited move");
// TODO: check for mandatory captures
final Set<Move> mandatoryJumps = getMandatoryJumps(board, expectedMoveColor);
if (mandatoryJumps.size() != 0 && !mandatoryJumps.contains(this))
throw new Exception("A mandatory opponent's stone capture must be performed");
movingStone = movingStone.promoteIfPossible(to);
if (board.put(to, movingStone) != null)
@ -66,7 +68,7 @@ public class Move {
intersection.retainAll(b);
if (intersection.size() != 1)
// A legit move is characterized by single intersection point
// A legit move is characterized by a single intersection point
throw new Exception("Prohibited move");
return intersection.iterator().next();
@ -113,7 +115,7 @@ public class Move {
Map.entry(2, Arrays.asList(6, 7, 9, 11)),
Map.entry(3, Arrays.asList(7, 8, 10, 12)),
Map.entry(4, Arrays.asList(8, 11)),
Map.entry(5, Arrays.asList(1, 9, 14, 9, 11)),
Map.entry(5, Arrays.asList(1, 9, 14)),
Map.entry(6, Arrays.asList(1, 2, 9, 10, 13, 15)),
Map.entry(7, Arrays.asList(2, 3, 10, 11, 14, 16)),
Map.entry(8, Arrays.asList(3, 4, 11, 12, 15)),
@ -149,6 +151,31 @@ public class Move {
}
}
public static Set<Move> getMandatoryJumps(Map<Integer, Stone> board, Stone.Color color) {
Set<Move> res = new HashSet<Move>();
for (Map.Entry<Integer, Stone> entry : board.entrySet()) {
final Integer from = entry.getKey();
final Stone stone = entry.getValue();
if (stone.getColor() != color)
continue;
final Stone.Color opponentsColor = color.opposite();
final Set<Move> allJumps = stone.getJumps(from);
allJumps.removeIf( j -> {
if (board.get(j.to) != null)
return true; // must be an empty jumpTo tile
final Stone jumpOverStone = board.get(j.jumpOver);
return jumpOverStone == null || jumpOverStone.getColor() != opponentsColor;
});
res.addAll(allJumps);
}
return res;
}
@Override
public int hashCode() {
final int prime = 31;