Class: TreeDiff::DotVisitor

Inherits:
Object
  • Object
show all
Defined in:
lib/tree_diff/dot_visitor.rb

Constant Summary collapse

COLORS =
{
  1 => 'blue',
  2 => 'red',
  3 => 'green',
}

Instance Method Summary collapse

Constructor Details

#initialize(root) ⇒ DotVisitor

Returns a new instance of DotVisitor.



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# File 'lib/tree_diff/dot_visitor.rb', line 9

def initialize root
  @root  = root
  @nodes = []
  @edges = []
end

Instance Method Details

#accept(target) ⇒ Object



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# File 'lib/tree_diff/dot_visitor.rb', line 15

def accept target
  target.accept(self)
end

#to_sObject



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# File 'lib/tree_diff/dot_visitor.rb', line 47

def to_s
  String.new(<<-eograph)
    digraph g {
      node [
        fontsize = "16"
        shape = "record"
        style = filled
      ];
      #{@nodes.join + @edges.join}
    }
  eograph
end

#visit(node) ⇒ Object



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# File 'lib/tree_diff/dot_visitor.rb', line 19

def visit node
  if @root.source == node.source
    @nodes << String.new(<<-eonode)
      "#{node.object_id}" [
        label = "<f0> (#{node.name})"
      ];
    eonode
  else
    i = 0
    @nodes << String.new(<<-eonode)
      "#{node.object_id}" [
        label = "{<f0> (#{node.name}) | #{node.source.map { |src|
          "<f#{i}> #{src}"
        }.join(" | ")}}"
        color = blue
      ];
    eonode
  end
  node.children.each { |child|
    @edges << String.new(<<-eoedge)
      "#{node.object_id}" -> "#{child.object_id}":f0 [
        id = #{@edges.length}
      ];
    eoedge
  }
  node.children.each { |c| c.accept(self) }
end