Initial flame_lua_runtime package

example/assets/games/ludo/scripts/rules.lua

@@ -0,0 +1,88 @@
+local state = runtime.import("state")
+local board = runtime.import("board")
+
+local rules = {}
+
+function rules.next_player()
+  if state.current_player == "red" then
+    return "blue"
+  end
+  return "red"
+end
+
+function rules.next_dice()
+  state.dice_index = state.dice_index + 1
+  if state.dice_index > #state.dice_values then
+    state.dice_index = 1
+  end
+  return state.dice_values[state.dice_index]
+end
+
+function rules.piece_home_position(piece)
+  if piece.owner == "red" then
+    if piece.id == "red_1" then return board.red_home[1] end
+    return board.red_home[2]
+  end
+  if piece.id == "blue_1" then return board.blue_home[1] end
+  return board.blue_home[2]
+end
+
+function rules.can_move(piece, dice)
+  if piece.status == "home" then
+    return dice == 6
+  end
+  return true
+end
+
+function rules.movable_pieces()
+  local result = {}
+  for id, piece in pairs(state.pieces) do
+    if piece.owner == state.current_player and rules.can_move(piece, state.dice) then
+      table.insert(result, id)
+    end
+  end
+  return result
+end
+
+function rules.all_piece_ids()
+  local result = {}
+  for id, _ in pairs(state.pieces) do
+    table.insert(result, id)
+  end
+  return result
+end
+
+function rules.calculate_path(piece, dice)
+  local path = {}
+  if piece.status == "home" then
+    local start_index = board.start[piece.owner]
+    local pos = board.path[start_index]
+    table.insert(path, {x = pos.x, y = pos.y})
+    return path
+  end
+
+  for i = 1, dice do
+    local index = piece.path_index + i
+    while index > #board.path do
+      index = index - #board.path
+    end
+    local pos = board.path[index]
+    table.insert(path, {x = pos.x, y = pos.y})
+  end
+  return path
+end
+
+function rules.apply_move(piece, dice)
+  if piece.status == "home" then
+    piece.status = "path"
+    piece.path_index = board.start[piece.owner]
+    return
+  end
+
+  piece.path_index = piece.path_index + dice
+  while piece.path_index > #board.path do
+    piece.path_index = piece.path_index - #board.path
+  end
+end
+
+return rules