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Constraint Programming Solver
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lib/solver/core/propagator/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
alias CPSolver.DefaultDomain, as: Domain
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, opts \\ []) do
%{
id: Keyword.get_lazy(opts, :id, fn -> make_ref() end),
mod: mod,
args:
Enum.map(args, fn
%Variable{domain: domain} = arg ->
arg
|> Map.drop([:domain])
|> Map.put(:fixed?, Domain.fixed?(domain))
const ->
const
end)
}
end
def filter(%{mod: mod, args: args} = _propagator, opts \\ []) do
PropagatorVariable.reset_variable_ops()
store = Keyword.get(opts, :store)
try do
args
|> bind_variables(store)
|> mod.filter()
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
defp bind_variables(args, nil) do
args
end
defp bind_variables(args, store) do
args
|> Enum.map(fn
%Variable{} = v ->
Map.put(v, :store, store)
const ->
const
end)
end
end