Class: Reddy::RdfaParser

Inherits:
Object
  • Object
show all
Defined in:
lib/reddy/rdfaparser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str, uri) ⇒ RdfaParser

Returns a new instance of RdfaParser.



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# File 'lib/reddy/rdfaparser.rb', line 5

def initialize (str, uri)
  @doc_string = str
  @xml = REXML::Document.new(str)
  @uri = uri
  @graph = Graph.new
  self.iterate(@xml.root.elements[2].elements[1].elements[1])
end

Instance Attribute Details

#graph ⇒ Object

Returns the value of attribute graph.



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# File 'lib/reddy/rdfaparser.rb', line 3

def graph
  @graph
end

#uri ⇒ Object

Returns the value of attribute uri.



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# File 'lib/reddy/rdfaparser.rb', line 3

def uri
  @uri
end

#xml ⇒ Object

Returns the value of attribute xml.



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# File 'lib/reddy/rdfaparser.rb', line 3

def xml
  @xml
end

Instance Method Details

#iterate(el) ⇒ Object 



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# File 'lib/reddy/rdfaparser.rb', line 24

def iterate (el)

  if el.attributes['about']
    if el.attributes['about'] =~ /^http/
      # deal with as absolute
      subject = el.attributes['about'].to_s
    else
      # time to go xml:base sneakin'
      if xml.base?
        subject = Addressable::URI.parse(xml.base)
        subject = subject + el.attributes['about']
      else
        subject = Addressable::URI.parse(@uri)
        subject = subject + el.attributes['about']
      end
    end
  else
    subject = @uri
  end
  
  if el.attributes['property']
    if el.attributes['property'] =~ /^http/
      property = el.attributes['property']
    else
      # curie hunt!
    property = self.parse_ns_curie(el, "property")
    end
  end
  
  if el.attributes['content']
    value = el.attributes['content']
  else
    value = el.text
  end

  @graph.add_triple subject.to_s, URIRef.new(property), value
end

#parse_ns_curie(el, attname) ⇒ Object 



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# File 'lib/reddy/rdfaparser.rb', line 13

def parse_ns_curie(el, attname)
  attstring = el.attributes[attname]
  prefix = attstring.scan(/(.+):.+/).to_s
  if el.namespaces[prefix]
    namespace = el.namespaces[prefix]
  else
    raise "Namespace used in CURIE but not declared"
  end
  return namespace + attstring.scan(/.+:(.+)/).to_s
end