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elevator.coffee
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/
elevator.coffee
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new_state = (values) ->
new_state =
floor: 0,
open: false,
path: []
for key of values
new_state[key] = values[key]
new_state
call = (state, floor) ->
if floor not in state.path
state.path.push(floor)
state
next = (state) ->
if (nowhere_to_go(state)) then nothing(state)
else if (should_close(state)) then close(state)
else if (should_open(state)) then open(state)
else if (should_go_up(state)) then up(state)
else if (should_go_down(state)) then down(state)
else nothing()
nothing = (state) ->
{cmd: 'NOTHING', state: state}
open = (state) ->
state.path.shift()
state.open = true
{cmd: 'OPEN', state: state}
close = (state) ->
state.open = false
{cmd: 'CLOSE', state: state}
up = (state) ->
state.floor = state.floor + 1
{cmd: 'UP', state: state}
down = (state) ->
state.floor = state.floor - 1
{cmd: 'DOWN', state: state}
should_open = (state) ->
state.floor == state.path[0]
should_close = (state) ->
state.open
should_go_up = (state) ->
state.path[0] > state.floor
should_go_down = (state) ->
state.path[0] < state.floor
nowhere_to_go = (state) ->
state.path.length == 0
exports.new_state = new_state
exports.call = call
exports.next = next