Class: GraphML::Parser

Inherits:
Nokogiri::XML::SAX::Document
  • Object
show all
Defined in:
lib/ruby-graphml.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/ruby-graphml.rb', line 100

def initialize
  @current_node = nil
  @current_key = nil
  @current_edge = nil
  @state = nil
  @sub_state = nil
  @graph = Graph.new
end

Instance Attribute Details

#graph ⇒ Object (readonly)

Returns the value of attribute graph.



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# File 'lib/ruby-graphml.rb', line 91

def graph
  @graph
end

Class Method Details

.parse!(path) ⇒ Object 



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# File 'lib/ruby-graphml.rb', line 93

def self.parse!(path)
  parser = self.new
  graph  = parser.graph
  parser = Nokogiri::XML::SAX::Parser.new(parser).parse(File.open(path, 'rb'))
  graph
end

Instance Method Details

#characters(string) ⇒ Object 



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# File 'lib/ruby-graphml.rb', line 143

def characters(string)
  return if @sub_state.nil?
  case @state
  when 'key'
    raise 'Missing key object' if @current_key.nil?
    @current_key.append(@sub_state, string)
  when 'node'
    raise 'Missing node object' if @current_node.nil?
    @current_node.data[@sub_state] ||= ''
    @current_node.data[@sub_state] += string
  end
end

#end_element(name) ⇒ Object 



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# File 'lib/ruby-graphml.rb', line 156

def end_element(name)
  case @state
  when 'node'
    if name == 'node'
      @current_node = nil
      @state = nil
    else
      @sub_state = nil
    end
  when 'edge'
    if name == 'edge'
      @current_edge = nil
      @state = nil
    else
      @sub_state = nil
    end        
  when 'key'
    if name == 'key'
      @current_key = nil
      @state = nil
    else
      @sub_state = nil
    end
  end
end

#start_element(name, attrs = []) ⇒ Object 



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# File 'lib/ruby-graphml.rb', line 109

def start_element(name, attrs=[])
  case @state
  # creating a new key, node or edge
  when nil
    case name
    when 'key'
      @current_key = Key.new(attrs)
      @graph.keys[@current_key.id] = @current_key
      @graph.key_names[@current_key.name] = @current_key
    when 'node'
      @current_node = Node.new(attrs, @graph)
      @graph.nodes[@current_node.id] = @current_node
    when 'edge'
      @current_edge = Edge.new(attrs, @graph)
      @graph.edges << @current_edge
    else
      return
    end
    @state = name
    @sub_state = nil
    
  # adding to a key
  when 'key'
    raise 'Missing key object' if @current_key.nil?
    @sub_state = name
  
  # adding a key value to a node
  when 'node'
    raise 'Missing node object' if @current_node.nil?
    raise 'Unexpected attribute' if attrs[0][0] != 'key'
    @sub_state = attrs[0][1]
  end
end