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#--
# Copyright (c) 2006 Shawn Patrick Garbett
# Copyright (c) 2002,2004,2005 by Horst Duchene
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice(s),
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of the Shawn Garbett nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#++
require 'puppet/gratr/edge'
require 'puppet/gratr/graph'
require 'set'
module GRATR
# This provides the basic routines needed to implement the Digraph, UndirectedGraph,
# PseudoGraph, DirectedPseudoGraph, MultiGraph and DirectedPseudoGraph class.
module AdjacencyGraph
include Graph
class ArrayWithAdd < Array # :nodoc:
alias add push
end
# Initialization parameters can include an Array of edges to add, Graphs to
# copy (will merge if multiple)
# :parallel_edges denotes that duplicate edges are allowed
# :loops denotes that loops are allowed
def initialize(*params)
@vertex_dict = Hash.new
raise ArgumentError if params.any? do |p|
!(p.kind_of? GRATR::Graph or
p.kind_of? Array or
p == :parallel_edges or
p == :loops)
end
clear_all_labels
# Basic configuration of adjacency
@allow_loops = params.any? {|p| p == :loops}
@parallel_edges = params.any? {|p| p == :parallel_edges}
@edgelist_class = @parallel_edges ? ArrayWithAdd : Set
if @parallel_edges
@edge_number = Hash.new
@next_edge_number = 0
end
# Copy any given graph into this graph
params.select {|p| p.kind_of? GRATR::Graph}.each do |g|
g.edges.each do |e|
add_edge!(e)
edge_label_set(e, edge_label(e)) if edge_label(e)
end
g.vertices.each do |v|
vertex_label_set(v, vertex_label(v)) if vertex_label(v)
end
end
# Add all array edges specified
params.select {|p| p.kind_of? Array}.each do |a|
0.step(a.size-1, 2) {|i| add_edge!(a[i], a[i+1])}
end
end
# Returns true if v is a vertex of this Graph
# An O(1) implementation of vertex?
def vertex?(v) @vertex_dict.has_key?(v); end
# Returns true if [u,v] or u is an Edge
# An O(1) implementation
def edge?(u, v=nil)
u, v = u.source, u.target if u.kind_of? GRATR::Edge
vertex?(u) and @vertex_dict[u].include?(v)
end
# Adds a vertex to the graph with an optional label
def add_vertex!(vertex, label=nil)
@vertex_dict[vertex] ||= @edgelist_class.new
self[vertex] = label if label
self
end
# Adds an edge to the graph
# Can be called in two basic ways, label is optional
# * add_edge!(Edge[source,target], "Label")
# * add_edge!(source,target, "Label")
def add_edge!(u, v=nil, l=nil, n=nil)
n = u.number if u.class.include? EdgeNumber and n.nil?
u, v, l = u.source, u.target, u.label if u.kind_of? GRATR::Edge
return self if not @allow_loops and u == v
n = (@next_edge_number+=1) unless n if @parallel_edges
add_vertex!(u); add_vertex!(v)
@vertex_dict[u].add(v)
(@edge_number[u] ||= @edgelist_class.new).add(n) if @parallel_edges
unless directed?
@vertex_dict[v].add(u)
(@edge_number[v] ||= @edgelist_class.new).add(n) if @parallel_edges
end
self[n ? edge_class[u,v,n] : edge_class[u,v]] = l if l
self
end
# Removes a given vertex from the graph
def remove_vertex!(v)
# FIXME This is broken for multi graphs
@vertex_dict.delete(v)
@vertex_dict.each_value { |adjList| adjList.delete(v) }
@vertex_dict.keys.each do |u|
delete_label(edge_class[u,v])
delete_label(edge_class[v,u])
end
delete_label(v)
self
end
# Removes an edge from the graph, can be called with source and target or with
# and object of GRATR::Edge derivation
def remove_edge!(u, v=nil)
unless u.kind_of? GRATR::Edge
raise ArgumentError if @parallel_edges
u = edge_class[u,v]
end
raise ArgumentError if @parallel_edges and (u.number || 0) == 0
return self unless @vertex_dict[u.source] # It doesn't exist
delete_label(u) # Get rid of label
if @parallel_edges
index = @edge_number[u.source].index(u.number)
raise NoEdgeError unless index
@vertex_dict[u.source].delete_at(index)
@edge_number[u.source].delete_at(index)
else
@vertex_dict[u.source].delete(u.target)
end
self
end
# Returns an array of vertices that the graph has
def vertices() @vertex_dict.keys; end
# Returns an array of edges, most likely of class Edge or UndirectedEdge depending
# upon the type of graph
def edges
@vertex_dict.keys.inject(Set.new) do |a,v|
if @parallel_edges and @edge_number[v]
@vertex_dict[v].zip(@edge_number[v]).each do |w|
s,t,n = v,w[0],w[1]
a.add( edge_class[ s,t,n, edge_label(s,t,n) ] )
end
else
@vertex_dict[v].each do |w|
a.add(edge_class[v,w,edge_label(v,w)])
end
end; a
end.to_a
end
alias graph_adjacent adjacent
def adjacent(x, options={})
options[:direction] ||= :out
if !x.kind_of?(GRATR::Edge) and (options[:direction] == :out || !directed?)
if options[:type] == :edges
@parallel_edges ?
@vertex_dict[x].map {|v| e=edge_class[x,v,@edge_number[x][v]]; e.label = self[e]; e} :
@vertex_dict[x].map {|v| e=edge_class[x,v]; e.label = self[e]; e}
else
@vertex_dict[x].to_a
end
else
graph_adjacent(x,options)
end
end
public
def self.included(cl)
# Shortcut for creating a Graph
#
# Example: GRATR::Digraph[1,2, 2,3, 2,4, 4,5].edges.to_a.to_s =>
# "(1-2)(2-3)(2-4)(4-5)"
#
# Or as a Hash for specifying lables
# GRATR::Digraph[ [:a,:b] => 3, [:b,:c] => 4 ] (Note: Do not use for Multi or Pseudo graphs)
def cl.[] (*a)
result = new
if a.size == 1 and a[0].kind_of? Hash
# Convert to edge class
a[0].each do |k,v|
if result.edge_class.include? GRATR::EdgeNumber
result.add_edge!(result.edge_class[k[0],k[1],nil,v])
else
result.add_edge!(result.edge_class[k[0],k[1],v])
end
end
elsif a[0].kind_of? GRATR::Edge
a.each{|e| result.add_edge!(e); result[e] = e.label}
elsif a.size % 2 == 0
0.step(a.size-1, 2) {|i| result.add_edge!(a[i], a[i+1])}
else
raise ArgumentError
end
result
end
end
end # Adjacency Graph
end # GRATR
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