/** verifies whether the specified move conforms to this rule in the provided context */
public boolean matches(Move move, Context context) throws Exception {
GameState st = context.getState();
if (element.matches(move.element, context))
if ((state == null) || (state.matches(st.elementStates.get(move.element), context)))
if ((currentPlayer == null) || (currentPlayer.matches(st.currentPlayer, context)))
if (from.matches(move.from, context))
if (to.matches(move.to, context)) return condition.eval(context).isTrue();
return false;
}
/**
* list of moves that can be performed from this state with the element specified in the first
* argument
*
* @return the list or null, if no such moves exist
*/
public ArrayList<Move> getMatchingMoves(Element el, GameSpecification specs, Context context)
throws Exception {
GameState st = context.getState();
ArrayList<Move> moves = new ArrayList<Move>();
if (element.matches(el.name.fullName, context))
if ((state == null) || (state.matches(st.elementStates.get(el.name.fullName), context)))
if ((currentPlayer == null) || (currentPlayer.matches(st.currentPlayer, context))) {
String tryFrom = st.elementLocations.get(el.name.fullName);
if (from.matches(tryFrom, context))
for (Location tryTo : specs.locations.values())
if (st.locationElements.get(tryTo.name.fullName) == null)
if (to.matches(tryTo.name.fullName, context))
if (condition.eval(context).isTrue())
moves.add(new Move(tryFrom, tryTo.name.fullName, el.name.fullName, specs));
}
if (moves.size() > 0) return moves;
return null;
}
/** construct an empty rule with the specified name */
public GameRule(String name) {
this.name = name;
scorePlayer = new ArrayList<Expr>();
scoreAmount = new ArrayList<Expr>();
condition = Expr.booleanExpr(true);
}
/** perform the follow-up action, after this rule was matched */
public void performAction(Context context) throws Exception {
if (action != null) action.eval(context);
}