37 lines
1.2 KiB
Text
37 lines
1.2 KiB
Text
# seats.ludic - a Thing's seats: a run of the game's seat rows, and a bit per seat
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# for whoever sits in it. The rows are the game's; the package keeps only which are taken.
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export const THING_SEATS_MAX: int = 30
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# the Thing's seats are rows first .. first + n - 1 of the game's table; none are taken
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export function thing_set_seats(t: Thing, first: int, n: int) -> void {
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t.seat = first
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t.seats = Math.clamp(n, 0, THING_SEATS_MAX)
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if first < 0 { t.seats = 0 }
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t.taken = 0
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}
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export function thing_seat_taken(t: Thing, i: int) -> bool {
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if i < 0 or i >= t.seats { return true }
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return (t.taken >> i) & 1 == 1
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}
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# false when it is not one of the Thing's seats or someone is in it
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export function thing_seat_take(t: Thing, i: int) -> bool {
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if thing_seat_taken(t, i) { return false }
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t.taken = t.taken | (1 << i)
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return true
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}
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export function thing_seat_leave(t: Thing, i: int) -> void {
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if i < 0 or i >= t.seats or (t.taken >> i) & 1 == 0 { return }
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t.taken = t.taken - (1 << i)
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}
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# the first seat nobody is in, or -1
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export function thing_seat_free(t: Thing) -> int {
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for i in 0 .. t.seats {
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if not thing_seat_taken(t, i) { return i }
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}
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return -1
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}
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