Class: Gem::Resolver::Molinillo::DependencyGraph

Relationships & Source Files
Namespace Children
Classes: `Action`, `AddEdgeNoCircular`, `AddVertex`, `DeleteEdge`, `DetachVertexNamed`, `Edge`, `Log`, `SetPayload`, `Tag`, `Vertex`
Super Chains via Extension / Inclusion / Inheritance
Instance Chain: self, `::Gem::TSort`, Enumerable
Inherits:	Object
Defined in:	lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/action.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/add_vertex.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/delete_edge.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/log.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/set_payload.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/tag.rb, lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/vertex.rb

Overview

A directed acyclic graph that is tuned to hold named dependencies

Class Method Summary

.new ⇒ DependencyGraph constructor

Initializes an empty dependency graph.
.tsort(vertices) ⇒ Array<Vertex>

Topologically sorts the given vertices.

Instance Attribute Summary

#log ⇒ Log readonly
#vertices ⇒ {String => Vertex} readonly

Instance Method Summary

#==(other) ⇒ Boolean
#add_child_vertex(name, payload, parent_names, requirement) ⇒ void
#add_edge(origin, destination, requirement) ⇒ Edge

Adds a new Edge to the dependency graph.
#add_vertex(name, payload, root = false) ⇒ Vertex

Adds a vertex with the given name, or updates the existing one.
#delete_edge(edge) ⇒ Void

Deletes an Edge from the dependency graph.
#detach_vertex_named(name) ⇒ Array<Vertex>

Detaches the #vertex_named name Vertex from the graph, recursively removing any non-root vertices that were orphaned in the process.
#each ⇒ Array<Vertex> (also: #tsort_each_node)

Enumerates through the vertices of the graph.
#initialize_copy(other)

Initializes a copy of a DependencyGraph, ensuring that all #vertices are properly copied.
#inspect ⇒ String
#rewind_to(tag) ⇒ Void

Rewinds the graph to the state tagged as #tag
#root_vertex_named(name) ⇒ Vertex^?
#set_payload(name, payload) ⇒ Void

Sets the payload of the vertex with the given name.
#tag(tag) ⇒ Void

Tags the current state of the dependency as the given tag.
#to_dot(options = {}) ⇒ String
#vertex_named(name) ⇒ Vertex^?
#add_edge_no_circular(origin, destination, requirement) private

Adds a new Edge to the dependency graph without checking for circularity.
#path(from, to) ⇒ Array<Vertex> private

Returns the path between two vertices.
#tsort_each_child(vertex, &block) private
#tsort_each_node private

Alias for #each.

`::Gem::TSort` - Included

#each_strongly_connected_component	The iterator version of the `#strongly_connected_components` method.
#each_strongly_connected_component_from	Iterates over strongly connected component in the subgraph reachable from node.
#strongly_connected_components	Returns strongly connected components as an array of arrays of nodes.
#tsort	Returns a topologically sorted array of nodes.
#tsort_each	The iterator version of the `#tsort` method.
#tsort_each_child	Should be implemented by a extended class.
#tsort_each_node	Should be implemented by a extended class.

Constructor Details

.new ⇒ `DependencyGraph`

Initializes an empty dependency graph

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 55


def initialize
  @vertices = {}
  @log = Log.new
end

Class Method Details

.tsort(vertices) ⇒ `Array`<Vertex>

Topologically sorts the given vertices.

Parameters:

vertices (Enumerable<Vertex>) —

the vertices to be sorted, which must all belong to the same graph.

Returns:

(Array<Vertex>) —

The sorted vertices.

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 34


def self.tsort(vertices)
  Gem::TSort.tsort(
    lambda { |b| vertices.each(&b) },
    lambda { |v, &b| (v.successors & vertices).each(&b) }
  )
end

Instance Attribute Details

#log ⇒ Log (readonly)

Returns:

(Log) —

the op log for this graph

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 52


attr_reader :log

#vertices ⇒ {`String` => Vertex} (readonly)

Returns:

({String => Vertex}) —

the vertices of the dependency graph, keyed by Vertex#name

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 49


attr_reader :vertices

Instance Method Details

#==(other) ⇒ `Boolean`

Parameters:

other (DependencyGraph)

Returns:

(Boolean) —

whether the two dependency graphs are equal, determined by a recursive traversal of each #root_vertices and its Vertex#successors

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 130


def ==(other)
  return false unless other
  return true if equal?(other)
  vertices.each do |name, vertex|
    other_vertex = other.vertex_named(name)
    return false unless other_vertex
    return false unless vertex.payload == other_vertex.payload
    return false unless other_vertex.successors.to_set == vertex.successors.to_set
  end
end

#add_child_vertex(name, payload, parent_names, requirement) ⇒ `void`

This method returns an undefined value.

Parameters:

name (String)
payload (Object)
parent_names (Array<String>)
requirement (Object) —

the requirement that is requiring the child

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 146


def add_child_vertex(name, payload, parent_names, requirement)
  root = !parent_names.delete(nil) { true }
  vertex = add_vertex(name, payload, root)
  vertex.explicit_requirements << requirement if root
  parent_names.each do |parent_name|
    parent_vertex = vertex_named(parent_name)
    add_edge(parent_vertex, vertex, requirement)
  end
  vertex
end

#add_edge(origin, destination, requirement) ⇒ Edge

Adds a new DependencyGraph::Edge to the dependency graph

Parameters:

origin (Vertex)
destination (Vertex)
requirement (Object) —

the requirement that this edge represents

Returns:

(Edge) —

the added edge

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 191


def add_edge(origin, destination, requirement)
  if destination.path_to?(origin)
    raise CircularDependencyError.new(path(destination, origin))
  end
  add_edge_no_circular(origin, destination, requirement)
end

#add_edge_no_circular(origin, destination, requirement) (private)

Adds a new DependencyGraph::Edge to the dependency graph without checking for circularity.

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 219


def add_edge_no_circular(origin, destination, requirement)
  log.add_edge_no_circular(self, origin.name, destination.name, requirement)
end

#add_vertex(name, payload, root = false) ⇒ Vertex

Adds a vertex with the given name, or updates the existing one.

Parameters:

name (String)
payload (Object)

Returns:

(Vertex) —

the vertex that was added to self

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 161


def add_vertex(name, payload, root = false)
  log.add_vertex(self, name, payload, root)
end

#delete_edge(edge) ⇒ `Void`

Deletes an DependencyGraph::Edge from the dependency graph

Parameters:

edge (Edge)

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 201


def delete_edge(edge)
  log.delete_edge(self, edge.origin.name, edge.destination.name, edge.requirement)
end

#detach_vertex_named(name) ⇒ `Array`<Vertex>

Detaches the #vertex_named name DependencyGraph::Vertex from the graph, recursively removing any non-root vertices that were orphaned in the process

Parameters:

name (String)

Returns:

(Array<Vertex>) —

the vertices which have been detached

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 169


def detach_vertex_named(name)
  log.detach_vertex_named(self, name)
end

#each ⇒ `Array`<Vertex> Also known as: #tsort_each_node

Enumerates through the vertices of the graph.

Returns:

(Array<Vertex>) —

The graph’s vertices.

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 15


def each
  return vertices.values.each unless block_given?
  vertices.values.each { |v| yield v }
end

#initialize_copy(other)

Initializes a copy of a DependencyGraph, ensuring that all #vertices are properly copied.

Parameters:

other (DependencyGraph) —

the graph to copy.

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 77


def initialize_copy(other)
  super
  @vertices = {}
  @log = other.log.dup
  traverse = lambda do |new_v, old_v|
    return if new_v.outgoing_edges.size == old_v.outgoing_edges.size
    old_v.outgoing_edges.each do |edge|
      destination = add_vertex(edge.destination.name, edge.destination.payload)
      add_edge_no_circular(new_v, destination, edge.requirement)
      traverse.call(destination, edge.destination)
    end
  end
  other.vertices.each do |name, vertex|
    new_vertex = add_vertex(name, vertex.payload, vertex.root?)
    new_vertex.explicit_requirements.replace(vertex.explicit_requirements)
    traverse.call(new_vertex, vertex)
  end
end

#inspect ⇒ `String`

Returns:

(String) —

a string suitable for debugging

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 97


def inspect
  "#{self.class}:#{vertices.values.inspect}"
end

#path(from, to) ⇒ `Array`<Vertex> (private)

Returns the path between two vertices

Parameters:

from (Vertex)
to (Vertex)

Returns:

(Array<Vertex>) —

the shortest path from from to to

Raises:

(ArgumentError) —

if there is no path between the vertices

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 228


def path(from, to)
  distances = Hash.new(vertices.size + 1)
  distances[from.name] = 0
  predecessors = {}
  each do |vertex|
    vertex.successors.each do |successor|
      if distances[successor.name] > distances[vertex.name] + 1
        distances[successor.name] = distances[vertex.name] + 1
        predecessors[successor] = vertex
      end
    end
  end

  path = [to]
  while before = predecessors[to]
    path << before
    to = before
    break if to == from
  end

  unless path.last.equal?(from)
    raise ArgumentError, "There is no path from #{from.name} to #{to.name}"
  end

  path.reverse
end

#rewind_to(tag) ⇒ `Void`

Rewinds the graph to the state tagged as #tag

Parameters:

tag (Object) —

the tag to rewind to

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 70


def rewind_to(tag)
  log.rewind_to(self, tag)
end

#root_vertex_named(name) ⇒ Vertex^?

Parameters:

name (String)

Returns:

(Vertex, nil) —

the root vertex with the given name

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 181


def root_vertex_named(name)
  vertex = vertex_named(name)
  vertex if vertex && vertex.root?
end

#set_payload(name, payload) ⇒ `Void`

Sets the payload of the vertex with the given name

Parameters:

name (String) —

the name of the vertex
payload (Object) —

the payload

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 209


def set_payload(name, payload)
  log.set_payload(self, name, payload)
end

#tag(tag) ⇒ `Void`

Tags the current state of the dependency as the given tag

Parameters:

tag (Object) —

an opaque tag for the current state of the graph

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 63


def tag(tag)
  log.tag(self, tag)
end

#to_dot(options = {}) ⇒ `String`

Parameters:

options (Hash) (defaults to: {}) —

options for dot output.

Returns:

(String) —

Returns a dot format representation of the graph

Raises:

(ArgumentError)

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 103


def to_dot(options = {})
  edge_label = options.delete(:edge_label)
  raise ArgumentError, "Unknown options: #{options.keys}" unless options.empty?

  dot_vertices = []
  dot_edges = []
  vertices.each do |n, v|
    dot_vertices << "  #{n} [label=\"{#{n}|#{v.payload}}\"]"
    v.outgoing_edges.each do |e|
      label = edge_label ? edge_label.call(e) : e.requirement
      dot_edges << "  #{e.origin.name} -> #{e.destination.name} [label=#{label.to_s.dump}]"
    end
  end

  dot_vertices.uniq!
  dot_vertices.sort!
  dot_edges.uniq!
  dot_edges.sort!

  dot = dot_vertices.unshift('digraph G {').push('') + dot_edges.push('}')
  dot.join("\n")
end

#tsort_each_child(vertex, &block) (private)

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 26


def tsort_each_child(vertex, &block)
  vertex.successors.each(&block)
end

#tsort_each_node (private)

Alias for #each.

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 23


alias tsort_each_node each

#vertex_named(name) ⇒ Vertex^?

Parameters:

name (String)

Returns:

(Vertex, nil) —

the vertex with the given name

[ GitHub ]

# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph.rb', line 175


def vertex_named(name)
  vertices[name]
end

Class: Gem::Resolver::Molinillo::DependencyGraph

Overview

Class Method Summary

Instance Attribute Summary

Instance Method Summary

::Gem::TSort - Included

Constructor Details

.new ⇒ DependencyGraph

Class Method Details

.tsort(vertices) ⇒ Array<Vertex>

Instance Attribute Details

#log ⇒ Log (readonly)

#vertices ⇒ {String => Vertex} (readonly)

Instance Method Details

#==(other) ⇒ Boolean

#add_child_vertex(name, payload, parent_names, requirement) ⇒ void

#add_edge(origin, destination, requirement) ⇒ Edge

#add_edge_no_circular(origin, destination, requirement) (private)

#add_vertex(name, payload, root = false) ⇒ Vertex

#delete_edge(edge) ⇒ Void

#detach_vertex_named(name) ⇒ Array<Vertex>

#each ⇒ Array<Vertex> Also known as: #tsort_each_node

#initialize_copy(other)

#inspect ⇒ String

#path(from, to) ⇒ Array<Vertex> (private)

#rewind_to(tag) ⇒ Void

#root_vertex_named(name) ⇒ Vertex?

#set_payload(name, payload) ⇒ Void

#tag(tag) ⇒ Void

#to_dot(options = {}) ⇒ String

#tsort_each_child(vertex, &block) (private)

#tsort_each_node (private)

#vertex_named(name) ⇒ Vertex?

`::Gem::TSort` - Included

.new ⇒ `DependencyGraph`

.tsort(vertices) ⇒ `Array`<Vertex>

#vertices ⇒ {`String` => Vertex} (readonly)

#==(other) ⇒ `Boolean`

#add_child_vertex(name, payload, parent_names, requirement) ⇒ `void`

#delete_edge(edge) ⇒ `Void`

#detach_vertex_named(name) ⇒ `Array`<Vertex>

#each ⇒ `Array`<Vertex> Also known as: #tsort_each_node

#inspect ⇒ `String`

#path(from, to) ⇒ `Array`<Vertex> (private)

#rewind_to(tag) ⇒ `Void`

#root_vertex_named(name) ⇒ Vertex^?

#set_payload(name, payload) ⇒ `Void`

#tag(tag) ⇒ `Void`

#to_dot(options = {}) ⇒ `String`

#vertex_named(name) ⇒ Vertex^?