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Constraint Programming Solver
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lib/solver/store/local_store.ex
defmodule CPSolver.Store.Local do
alias CPSolver.DefaultDomain, as: Domain
use CPSolver.ConstraintStore
@impl true
def create(variables, _opts \\ []) do
{:ok, Enum.reduce(variables, {}, fn v, acc -> Tuple.append(acc, v.domain) end)}
end
@impl true
def dispose(_store, _vars) do
:ok
end
@impl true
def get(domain_list, variable, operation, args \\ []) do
handle_request(:get, domain_list, variable, operation, args)
end
@impl true
def update_domain(domain_list, variable, operation, args) do
handle_request(:update, domain_list, variable, operation, args)
end
@impl true
def on_change(_store, _variable, _change) do
:ok
end
@impl true
def on_fix(_store, _variable, _value) do
:ok
end
@impl true
def on_no_change(_store, _variable) do
:ok
end
@impl true
def on_fail(_store, _variable) do
:ok
end
defp update_variable_domain(
domain,
event
) do
case event do
:fixed -> {:fixed, Domain.min(domain)}
event -> event
end
end
@impl true
def domain(domain_list, variable) do
elem(domain_list, variable.index - 1)
end
def handle_request(kind, domain_list, variable, operation, args) do
handle_request_impl(kind, domain(domain_list, variable), operation, args)
end
def handle_request_impl(:get, domain, operation, args) do
apply(Domain, operation, [domain | args])
end
def handle_request_impl(:update, domain, operation, args) do
case apply(Domain, operation, [domain | args]) do
:fail ->
update_variable_domain(:fail, :fail)
# throw(:fail)
:no_change ->
:no_change
{domain_change, new_domain} ->
update_variable_domain(new_domain, domain_change)
end
end
end