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Constraint Programming Solver
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lib/solver/core/propagator/constraint_graph.ex
defmodule CPSolver.Propagator.ConstraintGraph do
@moduledoc """
The constraint graph connects propagators and their variables.
The edge between a propagator and a variable represents a notification
the propagator receives upon varable's domain change.
"""
alias CPSolver.Propagator
alias CPSolver.Variable.Interface
@spec create([Propagator.t()] | %{reference() => Propagator.t()}) :: Graph.t()
def create(propagators) when is_list(propagators) do
propagators
|> Enum.map(fn p -> {p.id, p} end)
|> Map.new()
|> create()
end
def create(propagators) when is_map(propagators) do
Enum.reduce(propagators, Graph.new(), fn {propagator_id,
%{mod: propagator_mod, args: args} = p},
acc ->
args
|> propagator_mod.variables()
|> Enum.reduce(acc, fn var, acc2 ->
Graph.add_vertex(acc2, propagator_vertex(propagator_id))
|> Graph.add_edge({:variable, Interface.id(var)}, propagator_vertex(propagator_id),
label: get_propagate_on(var)
)
end)
|> Graph.label_vertex(propagator_vertex(propagator_id), p)
end)
end
## Get a list of propagator ids that "listen" to the domain change of given variable.
def get_propagators(
constraint_graph,
variable_id,
domain_change
) do
constraint_graph
|> Graph.edges({:variable, variable_id})
|> Enum.flat_map(fn edge ->
if domain_change in edge.label do
{:propagator, p_id} = edge.v2
[p_id]
else
[]
end
end)
end
def has_variable?(graph, variable_id) do
Graph.has_vertex?(graph, {:variable, variable_id})
end
def get_propagator(%Graph{} = graph, propagator_id) do
case Graph.vertex_labels(graph, propagator_vertex(propagator_id)) do
[] -> nil
[p] -> p
end
end
def update_propagator(
%Graph{vertex_labels: labels, vertex_identifier: identifier} = graph,
propagator_id,
propagator
) do
vertex = propagator_vertex(propagator_id)
graph
# |> Graph.remove_vertex_labels(vertex)
# |> Graph.label_vertex(vertex, [propagator])
|> Map.put(:vertex_labels, Map.put(labels, identifier.(vertex), [propagator]))
end
def propagator_vertex(propagator_id) do
{:propagator, propagator_id}
end
def remove_propagator(graph, propagator_id) do
remove_vertex(graph, propagator_vertex(propagator_id))
end
## Remove variable and all propagators that are isolated points as a result of variable removal
def remove_variable(graph, variable_id) do
remove_vertex(graph, {:variable, variable_id})
end
def remove_fixed(graph, vars) do
Enum.reduce(vars, graph, fn v, acc ->
if Interface.fixed?(v) do
remove_variable(acc, v.id)
else
acc
end
end)
end
def remove_vertex(graph, vertex) do
Graph.delete_vertex(graph, vertex)
end
defp get_propagate_on(variable) do
Map.get(variable, :propagate_on, Propagator.to_domain_events(:fixed))
end
end