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EDIT :: add_edge_no_circular.rb

# frozen_string_literal: true require_relative 'action' module Gem::Molinillo class DependencyGraph # @!visibility private # (see DependencyGraph#add_edge_no_circular) class AddEdgeNoCircular < Action # @!group Action # (see Action.action_name) def self.action_name :add_vertex end # (see Action#up) def up(graph) edge = make_edge(graph) edge.origin.outgoing_edges << edge edge.destination.incoming_edges << edge edge end # (see Action#down) def down(graph) edge = make_edge(graph) delete_first(edge.origin.outgoing_edges, edge) delete_first(edge.destination.incoming_edges, edge) end # @!group AddEdgeNoCircular # @return [String] the name of the origin of the edge attr_reader :origin # @return [String] the name of the destination of the edge attr_reader :destination # @return [Object] the requirement that the edge represents attr_reader :requirement # @param [DependencyGraph] graph the graph to find vertices from # @return [Edge] The edge this action adds def make_edge(graph) Edge.new(graph.vertex_named(origin), graph.vertex_named(destination), requirement) end # Initialize an action to add an edge to a dependency graph # @param [String] origin the name of the origin of the edge # @param [String] destination the name of the destination of the edge # @param [Object] requirement the requirement that the edge represents def initialize(origin, destination, requirement) @origin = origin @destination = destination @requirement = requirement end private def delete_first(array, item) return unless index = array.index(item) array.delete_at(index) end end end end

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