deck.gno

 1package engine
 2
 3// deckSize is the number of special cards in a deck.
 4const deckSize = 8
 5
 6// LegalDeck reports whether deck, a bit set by CardID, is deckSize cards of clan's pool
 7// holding exactly one Rare.
 8func (rs *Ruleset) LegalDeck(clan Clan, deck uint64) bool {
 9	if deck&^clan.Pool != 0 {
10		return false
11	}
12	cards, rares := 0, 0
13	for i := range rs.Cards {
14		if deck&(uint64(1)<<uint(i)) == 0 {
15			continue
16		}
17		cards++
18		if rs.Cards[i].Rare {
19			rares++
20		}
21	}
22	return cards == deckSize && rares == 1
23}