Class: RoadForest::TypeHandlers::RDFPost::Reader

Inherits:
RDF::Reader
  • Object
show all
Defined in:
lib/roadforest/type-handlers/rdfpost.rb

Overview

c.f. www.lsrn.org/semweb/rdfpost.html

Defined Under Namespace

Modules: St

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input, options = nil, &block) ⇒ Reader

Returns a new instance of Reader.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 216

def initialize(input, options=nil, &block)
  super(input, options||{}, &block)

  @lineno = 0
  @new_triple = false

  @states = {
    :rdf => St::RDF.new(self),
    :def_ns_decl => St::DefNsDecl.new(self),
    :ns_decl => St::NsDecl.new(self),
    :ns_decl_suffix => St::NsDeclSuffix.new(self),
    :skip_to_subject => St::SkipToSubject.new(self),
    :skip_to_subj_or_pred => St::SkipToSubjectOrPred.new(self),
    :subject => St::Subject.new(self),
    :subject_suffix => St::SubjectSuffix.new(self),
    :predicate => St::Predicate.new(self),
    :predicate_suffix => St::PredicateSuffix.new(self),
    :object => St::Object.new(self),
    :object_suffix => St::ObjectSuffix.new(self),
    :object_literal => St::ObjectLiteral.new(self),
    :type_or_lang => St::TypeOrLang.new(self)
  }

  @current_state = @states.fetch(:rdf)
end

Instance Attribute Details

#current_state ⇒ Object

Returns the value of attribute current_state.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 242

def current_state
  @current_state
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 241

def lineno
  @lineno
end

#namespace_prefix ⇒ Object

Returns the value of attribute namespace_prefix.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 245

def namespace_prefix
  @namespace_prefix
end

#new_triple ⇒ Object

Returns the value of attribute new_triple.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 243

def new_triple
  @new_triple
end

#object ⇒ Object

Returns the value of attribute object.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 243

def object
  @object
end

#object_lang ⇒ Object

Returns the value of attribute object_lang.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 244

def object_lang
  @object_lang
end

#object_prefix ⇒ Object

Returns the value of attribute object_prefix.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 245

def object_prefix
  @object_prefix
end

#object_type ⇒ Object

Returns the value of attribute object_type.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 244

def object_type
  @object_type
end

#predicate ⇒ Object

Returns the value of attribute predicate.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 243

def predicate
  @predicate
end

#predicate_prefix ⇒ Object

Returns the value of attribute predicate_prefix.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 245

def predicate_prefix
  @predicate_prefix
end

#states ⇒ Object (readonly)

Returns the value of attribute states.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 241

def states
  @states
end

#subject ⇒ Object

Returns the value of attribute subject.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 243

def subject
  @subject
end

#subject_prefix ⇒ Object

Returns the value of attribute subject_prefix.



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 245

def subject_prefix
  @subject_prefix
end

Instance Method Details

#build_triple ⇒ Object 



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 263

def build_triple
  if @object.nil? or @predicate.nil? or @subject.nil?
    raise EOFError
  end

  object = @object
  if object.is_a? String
    object = ::RDF::Literal.new(object, :datatype => object_type, :language => object_lang)
  end
  @object_type = nil
  @object_lang = nil

  [@subject, @predicate, object]
end

#consume_pair ⇒ Object 



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 282

def consume_pair
  @lineno += 1
end

#read_triple ⇒ Object 



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 247

def read_triple
  if @lineno >= @input.length
    raise EOFError
  end

  while @lineno < @input.length
    @current_state.accept(*@input[@lineno])
    if @new_triple
      @new_triple = false
      return build_triple
    end
  end

  return build_triple
end

#rewind ⇒ Object 



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# File 'lib/roadforest/type-handlers/rdfpost.rb', line 278

def rewind
  @lineno = 0
end