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File Name : log.rb

# frozen_string_literal: true

require_relative 'add_edge_no_circular'
require_relative 'add_vertex'
require_relative 'delete_edge'
require_relative 'detach_vertex_named'
require_relative 'set_payload'
require_relative 'tag'

module Gem::Resolver::Molinillo
  class DependencyGraph
    # A log for dependency graph actions
    class Log
      # Initializes an empty log
      def initialize
        @current_action = @first_action = nil
      end

# @!macro [new] action
      #   {include:DependencyGraph#$0}
      #   @param [Graph] graph the graph to perform the action on
      #   @param (see DependencyGraph#$0)
      #   @return (see DependencyGraph#$0)

# @macro action
      def tag(graph, tag)
        push_action(graph, Tag.new(tag))
      end

# @macro action
      def add_vertex(graph, name, payload, root)
        push_action(graph, AddVertex.new(name, payload, root))
      end

# @macro action
      def detach_vertex_named(graph, name)
        push_action(graph, DetachVertexNamed.new(name))
      end

# @macro action
      def add_edge_no_circular(graph, origin, destination, requirement)
        push_action(graph, AddEdgeNoCircular.new(origin, destination, requirement))
      end

# {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)
      def delete_edge(graph, origin_name, destination_name, requirement)
        push_action(graph, DeleteEdge.new(origin_name, destination_name, requirement))
      end

# @macro action
      def set_payload(graph, name, payload)
        push_action(graph, SetPayload.new(name, payload))
      end

# 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
      def pop!(graph)
        return unless action = @current_action
        unless @current_action = action.previous
          @first_action = nil
        end
        action.down(graph)
        action
      end

extend Enumerable

# @!visibility private
      # Enumerates each action in the log
      # @yield [Action]
      def each
        return enum_for unless block_given?
        action = @first_action
        loop do
          break unless action
          yield action
          action = action.next
        end
        self
      end

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

# @macro action
      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

private

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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2025-09-13 07:01:38
..	dir	-	root/linksafe	0755	2025-09-13 07:01:38
action.rb	text/x-ruby	930 B	root/linksafe	0644	2025-08-20 02:37:02
add_edge_no_circular.rb	text/x-ruby	1.86 KB	root/linksafe	0644	2025-08-20 02:37:02
add_vertex.rb	text/x-ruby	1.6 KB	root/linksafe	0644	2025-08-20 02:37:02
delete_edge.rb	text/x-ruby	1.79 KB	root/linksafe	0644	2025-08-20 02:37:02
detach_vertex_named.rb	text/x-ruby	1.5 KB	root/linksafe	0644	2025-08-20 02:37:02
log.rb	text/x-ruby	3.54 KB	root/linksafe	0644	2025-08-20 02:37:02
set_payload.rb	text/x-ruby	1.09 KB	root/linksafe	0644	2025-08-20 02:37:02
tag.rb	text/x-ruby	681 B	root/linksafe	0644	2025-08-20 02:37:02
vertex.rb	text/x-ruby	5.08 KB	root/linksafe	0644	2025-08-20 02:37:02

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