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# Copyright (C) 2004 - 2012 Gregoire Lejeune <gregoire.lejeune@free.fr>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
require 'graphviz/attrs'
require 'graphviz/constants'
class GraphViz
class Edge
include GraphViz::Constants
# Create a new edge
#
# In:
# * vNodeOne : First node (can be a GraphViz::Node or a node ID)
# * vNodeTwo : Second node (can be a GraphViz::Node or a node ID)
# * parent_graph : Graph
def initialize( vNodeOne, vNodeTwo, parent_graph )
@node_one_id, @node_one_port = getNodeNameAndPort( vNodeOne )
@node_two_id, @node_two_port = getNodeNameAndPort( vNodeTwo )
@parent_graph = parent_graph
@edge_attributes = GraphViz::Attrs::new( nil, "edge", EDGESATTRS )
@index = nil
unless @parent_graph.directed?
(@parent_graph.find_node(@node_one_id) || @parent_graph.add_nodes(@node_one_id)).incidents << (@parent_graph.find_node(@node_two_id) || @parent_graph.add_nodes(@node_two_id))
(@parent_graph.find_node(@node_two_id) || @parent_graph.add_nodes(@node_two_id)).neighbors << (@parent_graph.find_node(@node_one_id) || @parent_graph.add_nodes(@node_one_id))
end
(@parent_graph.find_node(@node_one_id) || @parent_graph.add_nodes(@node_one_id)).neighbors << (@parent_graph.find_node(@node_two_id) || @parent_graph.add_nodes(@node_two_id))
(@parent_graph.find_node(@node_two_id) || @parent_graph.add_nodes(@node_two_id)).incidents << (@parent_graph.find_node(@node_one_id) || @parent_graph.add_nodes(@node_one_id))
end
# Return the node one as string (so with port if any)
def node_one(with_port = true, escaped = true)
if not(@node_one_port and with_port)
escaped ? GraphViz.escape(@node_one_id) : @node_one_id
else
escaped ? GraphViz.escape(@node_one_id, :force => true) + ":#{@node_one_port}" : "#{@node_one_id}:#{@node_one_port}"
end
end
alias :tail_node :node_one
# Return the node two as string (so with port if any)
def node_two(with_port = true, escaped = true)
if not(@node_two_port and with_port)
escaped ? GraphViz.escape(@node_two_id) : @node_two_id
else
escaped ? GraphViz.escape(@node_two_id, :force => true) + ":#{@node_two_port}" : "#{@node_two_id}:#{@node_two_port}"
end
end
alias :head_node :node_two
# Return the index of the edge
def index
@index
end
def index=(i) #:nodoc:
@index = i if @index == nil
end
# Set value +attribute_value+ to the edge attribute +attribute_name+
def []=( attribute_name, attribute_value )
attribute_value = attribute_value.to_s if attribute_value.class == Symbol
@edge_attributes[attribute_name.to_s] = attribute_value
end
# Set values for edge attributes or
# get the value of the given edge attribute +attribute_name+
def []( attribute_name )
# Modification by axgle (https://github.com/axgle)
if Hash === attribute_name
attribute_name.each do |key, value|
self[key] = value
end
else
if @edge_attributes[attribute_name.to_s]
@edge_attributes[attribute_name.to_s].clone
else
nil
end
end
end
#
# Calls block once for each attribute of the edge, passing the name and value to the
# block as a two-element array.
#
# If global is set to false, the block does not receive the attributes set globally
#
def each_attribute(global = true, &b)
attrs = @edge_attributes.to_h
if global
attrs = pg.edge.to_h.merge attrs
end
attrs.each do |k,v|
yield(k,v)
end
end
def each_attribut(global = true, &b)
warn "`GraphViz::Edge#each_attribut` is deprecated, please use `GraphViz::Edge#each_attribute`"
each_attribute(global, &b)
end
def <<( node ) #:nodoc:
n = @parent_graph.get_node(@node_two_id)
GraphViz::commonGraph( node, n ).add_edges( n, node )
end
alias :> :<< #:nodoc:
alias :- :<< #:nodoc:
alias :>> :<< #:nodoc:
#
# Return the root graph
#
def root_graph
return( (self.pg.nil?) ? nil : self.pg.root_graph )
end
def pg #:nodoc:
@parent_graph
end
# Set edge attributes
#
# Example :
# e = graph.add_edges( ... )
# ...
# e.set { |_e|
# _e.color = "blue"
# _e.fontcolor = "red"
# }
def set( &b )
yield( self )
end
# Add edge options
# use edge.<option>=<value> or edge.<option>( <value> )
def method_missing( idName, *args, &block ) #:nodoc:
return if idName == :to_ary
xName = idName.id2name
self[xName.gsub( /=$/, "" )]=args[0]
end
def output( oGraphType ) #:nodoc:
xLink = " -> "
if oGraphType == "graph"
xLink = " -- "
end
# reserved words, they aren't accepted in dot as node name
reserved_names = ["node", "edge","graph", "digraph", "subgraph", "strict"]
xOut = reserved_names.include?(self.node_one) ? "" << "_" + self.node_one : "" << self.node_one
xOut = xOut << xLink
xOut = reserved_names.include?(self.node_two) ? xOut << "_" + self.node_two : xOut << self.node_two
xAttr = ""
xSeparator = ""
@edge_attributes.data.each do |k, v|
xAttr << xSeparator + k + " = " + v.to_gv
xSeparator = ", "
end
if xAttr.length > 0
xOut << " [" + xAttr + "]"
end
xOut << ";"
return( xOut )
end
private
def getNodeNameAndPort( node )
name, port = nil, nil
if node.class == Hash
node.each do |k, v|
name, port = getNodeNameAndPort(k)
port = v
end
elsif node.class == String
name = node
else
name = node.id
end
return name, port
end
end
end
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