public List<Position> findAllRuleMatches(Rule r) {
// System.out.printf("%s", r.dump());
WildcardMatcher matcher = new WildcardMatcher(r.getWildcard());
PlayfieldMatcher<CharacterElement> pm = new PlayfieldMatcher<CharacterElement>();
List<Position> positions = new ArrayList<Position>();
// We only want to match the LEFT side of the rule, so we do this:
Rule matchSubject = r.createMatchSubject();
for (Position p : pm.getAllMatches(this, matchSubject, matcher)) {
// System.out.println("CONSIDERING (" + p.getX() + "," + p.getY() + ")");
// Discard all the ones that are at or above the rule
if (p.getY().compareTo(r.getOffsetY().add(r.getHeight())) >= 0) {
// System.out.println("(" + p.getX() + "," + p.getY() + ")..." + r.getOffsetY());
positions.add(p);
}
}
// System.out.println("---");
return positions;
}
/*
* We assume a match was made at the given position.
*/
public void applyRule(Rule r, Position p) {
IntegerElement i, j;
CharacterElement wildcard = r.getWildcard();
// System.out.printf("applying at %s: %s", p.toString(), r.dump());
/* Note that r.getHeight() == width/2 ... */
for (i = IntegerElement.ZERO; i.compareTo(r.getHeight()) < 0; i = i.succ()) {
for (j = IntegerElement.ZERO; j.compareTo(r.getHeight()) < 0; j = j.succ()) {
CharacterElement replacement = r.get(i.add(r.getHeight()), j);
IntegerElement destX = p.getX().add(i);
IntegerElement destY = p.getY().add(j);
// System.out.printf("(%s,%s): [%s] '%s' -> (%s,%s)\n", i, j, wildcard,
// replacement.getChar(), destX, destY);
if (wildcard == null || wildcard.getChar() != replacement.getChar()) {
set(destX, destY, replacement);
}
}
}
}