law know_at

minebender-game@1.0.0.0 · proof_grid.bend:86

import Base
import minebender-game@1.0.0.0/types.bend as T
import minebender-game@1.0.0.0/board.bend as B
import minebender-game@1.0.0.0/game.bend as G
import minebender-game@1.0.0.0/LAWS.bend as L

86# On the board, the knowledge shows what seen_at says.
87law know_at:
88  for +w: Nat
89  for +h: Nat
90  for +layout: T.Grid(Bool)
91  for +shown: T.Grid(Bool)
92  for +x: Nat
93  for +y: Nat
94  for +on: {B.on_board(w, h, T.Pos{x, y}) == True{} : Bool}
95  {L.at(T.Seen, T.Hidden{}, G.know_rows(w, h, layout, shown, List.range(h)), T.Pos{x, y})
96    == G.seen_at(w, h, layout, shown, T.Pos{x, y}) : T.Seen}