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Constraint Programming Solver
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lib/solver/search/search.ex
defmodule CPSolver.Search do
alias CPSolver.DefaultDomain, as: Domain
alias CPSolver.Search.VariableSelector
alias CPSolver.Search.Partition
require Logger
def default_strategy() do
{
:first_fail,
:indomain_min
}
end
def initialize({variable_choice, value_choice} = _search, space_data) do
{
VariableSelector.initialize(variable_choice, space_data),
Partition.initialize(value_choice, space_data)
}
end
### Helpers
# def branch(variables, {variable_choice, partition_strategy}) do
# branch(variables, variable_choice, partition_strategy, %{})
# end
def branch(variables, {variable_choice, partition_strategy}, data \\ %{}) do
branch(variables, variable_choice, partition_strategy, data)
end
# def branch(variables, variable_choice, partition_strategy, data \\ %{})
def branch(variables, variable_choice, partition_strategy, data) do
case VariableSelector.select_variable(variables, data, variable_choice) do
nil ->
[]
selected_variable ->
{:ok, domain_partitions} =
Partition.partition(selected_variable, partition_strategy)
variable_partitions(selected_variable, domain_partitions, variables)
end
end
defp set_domain(variable, domain) do
Map.put(variable, :domain, domain)
end
defp variable_partitions(selected_variable, domain_partitions, variables) do
Enum.map(domain_partitions, fn {domain, constraint} ->
{Enum.map(variables, fn var ->
domain_copy =
((var.id == selected_variable.id && domain) || var.domain)
# var.domain
|> Domain.copy()
set_domain(var, domain_copy)
end), constraint}
end)
end
end