# class Gem::Resolver::Molinillo::DependencyGraph::Log

A log for dependency graph actions

### Public Class Methods

new() click to toggle source

Initializes an empty log

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 14
    def initialize
      @current_action = @first_action = nil
    end

### Public Instance Methods

add_edge_no_circular(graph, origin, destination, requirement) click to toggle source

@macro action

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 40
    def add_edge_no_circular(graph, origin, destination, requirement)
      push_action(graph, AddEdgeNoCircular.new(origin, destination, requirement))
    end

add_vertex(graph, name, payload, root) click to toggle source

@macro action

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 30
    def add_vertex(graph, name, payload, root)
      push_action(graph, AddVertex.new(name, payload, root))
    end

delete_edge(graph, origin_name, destination_name, requirement) click to toggle source

{include:DependencyGraph#delete_edge} @param [Graph] graph the graph to perform the action on @param [String] origin_name @param [String] destination_name @param [Object] requirement @return (see `DependencyGraph#delete_edge`)

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 50
    def delete_edge(graph, origin_name, destination_name, requirement)
      push_action(graph, DeleteEdge.new(origin_name, destination_name, requirement))
    end

detach_vertex_named(graph, name) click to toggle source

@macro action

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 35
    def detach_vertex_named(graph, name)
      push_action(graph, DetachVertexNamed.new(name))
    end

each() { |action| ... } click to toggle source

@!visibility private Enumerates each action in the log @yield [Action]

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 76
    def each
      return enum_for unless block_given?
      action = @first_action
      loop do
        break unless action
        yield action
        action = action.next
      end
      self
    end

pop!(graph) click to toggle source

Pops the most recent action from the log and undoes the action @param [DependencyGraph] graph @return [Action] the action that was popped off the log

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 62
    def pop!(graph)
      return unless action = @current_action
      unless @current_action = action.previous
        @first_action = nil
      end
      action.down(graph)
      action
    end

reverse_each() { |action| ... } click to toggle source

@!visibility private Enumerates each action in the log in reverse order @yield [Action]

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 90
    def reverse_each
      return enum_for(:reverse_each) unless block_given?
      action = @current_action
      loop do
        break unless action
        yield action
        action = action.previous
      end
      self
    end

rewind_to(graph, tag) click to toggle source

@macro action

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 102
    def rewind_to(graph, tag)
      loop do
        action = pop!(graph)
        raise "No tag #{tag.inspect} found" unless action
        break if action.class.action_name == :tag && action.tag == tag
      end
    end

set_payload(graph, name, payload) click to toggle source

@macro action

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 55
    def set_payload(graph, name, payload)
      push_action(graph, SetPayload.new(name, payload))
    end

tag(graph, tag) click to toggle source

@macro action

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 25
    def tag(graph, tag)
      push_action(graph, Tag.new(tag))
    end

### Private Instance Methods

push_action(graph, action) click to toggle source

Adds the given action to the log, running the action @param [DependencyGraph] graph @param [Action] action @return The value returned by `action.up`

    # File lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, line 116
    def push_action(graph, action)
      action.previous = @current_action
      @current_action.next = action if @current_action
      @current_action = action
      @first_action ||= action
      action.up(graph)
    end