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module DOT
# these glogal vars are used to make nice graph source
$tab = ' '
$tab2 = $tab * 2
# if we don't like 4 spaces, we can change it any time
def change_tab( t )
$tab = t
$tab2 = t * 2
end
# options for node declaration
NODE_OPTS = [
'bgcolor',
'color',
'fontcolor',
'fontname',
'fontsize',
'height',
'width',
'label',
'layer',
'rank',
'shape',
'shapefile',
'style',
'URL',
]
# options for edge declaration
EDGE_OPTS = [
'color',
'decorate',
'dir',
'fontcolor',
'fontname',
'fontsize',
'id',
'label',
'layer',
'lhead',
'ltail',
'minlen',
'style',
'weight'
]
# options for graph declaration
GRAPH_OPTS = [
'bgcolor',
'center',
'clusterrank',
'color',
'compound',
'concentrate',
'fillcolor',
'fontcolor',
'fontname',
'fontsize',
'label',
'layerseq',
'margin',
'mclimit',
'nodesep',
'nslimit',
'ordering',
'orientation',
'page',
'rank',
'rankdir',
'ranksep',
'ratio',
'size',
'style',
'URL'
]
# a root class for any element in dot notation
class DOTSimpleElement
attr_accessor :name
def initialize( params = {} )
@label = params['name'] ? params['name'] : ''
end
def to_s
@name
end
end
# an element that has options ( node, edge or graph )
class DOTElement < DOTSimpleElement
#attr_reader :parent
attr_accessor :name, :options
def initialize( params = {}, option_list = [] )
super( params )
@name = params['name'] ? params['name'] : nil
@parent = params['parent'] ? params['parent'] : nil
@options = {}
option_list.each{ |i|
@options[i] = params[i] if params[i]
}
@options['label'] ||= @name if @name != 'node'
end
def each_option
@options.each{ |i| yield i }
end
def each_option_pair
@options.each_pair{ |key, val| yield key, val }
end
#def parent=( thing )
# @parent.delete( self ) if defined?( @parent ) and @parent
# @parent = thing
#end
end
# this is used when we build nodes that have shape=record
# ports don't have options :)
class DOTPort < DOTSimpleElement
attr_accessor :label
def initialize( params = {} )
super( params )
@name = params['label'] ? params['label'] : ''
end
def to_s
( @name && @name != "" ? "<#{@name}>" : "" ) + "#{@label}"
end
end
# node element
class DOTNode < DOTElement
def initialize( params = {}, option_list = NODE_OPTS )
super( params, option_list )
@ports = params['ports'] ? params['ports'] : []
end
def each_port
@ports.each{ |i| yield i }
end
def << ( thing )
@ports << thing
end
def push ( thing )
@ports.push( thing )
end
def pop
@ports.pop
end
def to_s( t = '' )
label = @options['shape'] != 'record' && @ports.length == 0 ?
@options['label'] ?
t + $tab + "label = \"#{@options['label']}\"\n" :
'' :
t + $tab + 'label = "' + " \\\n" +
t + $tab2 + "#{@options['label']}| \\\n" +
@ports.collect{ |i|
t + $tab2 + i.to_s
}.join( "| \\\n" ) + " \\\n" +
t + $tab + '"' + "\n"
t + "#{@name} [\n" +
@options.to_a.collect{ |i|
i[1] && i[0] != 'label' ?
t + $tab + "#{i[0]} = #{i[1]}" : nil
}.compact.join( ",\n" ) + ( label != '' ? ",\n" : "\n" ) +
label +
t + "]\n"
end
end
# subgraph element is the same to graph, but has another header in dot
# notation
class DOTSubgraph < DOTElement
def initialize( params = {}, option_list = GRAPH_OPTS )
super( params, option_list )
@nodes = params['nodes'] ? params['nodes'] : []
@dot_string = 'subgraph'
end
def each_node
@nodes.each{ |i| yield i }
end
def << ( thing )
@nodes << thing
end
def push( thing )
@nodes.push( thing )
end
def pop
@nodes.pop
end
def to_s( t = '' )
hdr = t + "#{@dot_string} #{@name} {\n"
options = @options.to_a.collect{ |name, val|
val && name != 'label' ?
t + $tab + "#{name} = #{val}" :
name ? t + $tab + "#{name} = \"#{val}\"" : nil
}.compact.join( "\n" ) + "\n"
nodes = @nodes.collect{ |i|
i.to_s( t + $tab )
}.join( "\n" ) + "\n"
hdr + options + nodes + t + "}\n"
end
end
# this is graph
class DOTDigraph < DOTSubgraph
def initialize( params = {}, option_list = GRAPH_OPTS )
super( params, option_list )
@dot_string = 'digraph'
end
end
# this is edge
class DOTEdge < DOTElement
attr_accessor :from, :to
def initialize( params = {}, option_list = EDGE_OPTS )
super( params, option_list )
@from = params['from'] ? params['from'] : nil
@to = params['to'] ? params['to'] : nil
end
def to_s( t = '' )
t + "#{@from} -> #{to} [\n" +
@options.to_a.collect{ |i|
i[1] && i[0] != 'label' ?
t + $tab + "#{i[0]} = #{i[1]}" :
i[1] ? t + $tab + "#{i[0]} = \"#{i[1]}\"" : nil
}.compact.join( "\n" ) + "\n" + t + "]\n"
end
end
end
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