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Constraint Programming Solver
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lib/solver/propagators/propagator.ex
defmodule CPSolver.Propagator do
@type propagator_event :: :domain_change | :bound_change | :min_change | :max_change | :fixed
@callback new(args :: list()) :: Propagator.t()
@callback filter(args :: list()) :: map() | :stable | :fail | propagator_event()
@callback variables(args :: list()) :: list()
alias CPSolver.Variable
alias CPSolver.Propagator.Variable, as: PropagatorVariable
defmacro __using__(_) do
quote do
alias CPSolver.Propagator
import CPSolver.Propagator.Variable
@behaviour Propagator
def new(args) do
Propagator.new(__MODULE__, args)
end
def variables(args) do
Propagator.default_variables_impl(args)
end
defoverridable variables: 1
end
end
def propagator_events() do
[:domain_change, :bound_change, :min_change, :max_change, :fixed]
end
def default_variables_impl(args) do
args
|> Enum.filter(fn
%Variable{} -> true
_ -> false
end)
end
def new(mod, args) do
{mod, args}
end
@spec normalize([Propagator.t()]) :: %{reference() => Propagator.t()}
def normalize(propagators) when is_list(propagators) do
propagators
|> Enum.map(&normalize/1)
|> Map.new(fn p -> {make_ref(), p} end)
end
def normalize({_mod, args} = propagator) when is_list(args) do
propagator
end
def normalize(propagator) when is_tuple(propagator) do
[mod | args] = Tuple.to_list(propagator)
normalize({mod, args})
end
def filter({_mod, _args} = propagator) do
filter(propagator, nil)
end
def filter({mod, args} = _propagator, id) do
filter(mod, args, id)
end
def filter(mod, args, _id \\ nil) do
PropagatorVariable.reset_variable_ops()
try do
mod.filter(args)
catch
{:fail, var_id} ->
{:fail, var_id}
else
:stable ->
:stable
_res ->
## If propagator doesn't explicitly return 'stable',
## we retrieve the map of variable operation results created by PropagatorVariable wrapper
get_filter_changes()
end
end
## How propagator events map to domain events
def to_domain_events(:domain_change) do
[:domain_change, :min_change, :max_change, :fixed]
end
def to_domain_events(:bound_change) do
[:min_change, :max_change, :fixed]
end
def to_domain_events(:min_change) do
[:min_change, :fixed]
end
def to_domain_events(:max_change) do
[:max_change, :fixed]
end
def to_domain_events(:fixed) do
[:fixed]
end
@spec get_filter_changes() ::
:stable | {:changed, [{atom(), reference()}]}
defp get_filter_changes() do
filter_changes = PropagatorVariable.get_variable_ops()
(filter_changes && {:changed, filter_changes}) || :stable
end
end