Class: BibTeX::Entry::RDFConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/bibtex/entry/rdf_converter.rb

Constant Summary collapse

DEFAULT_REMOVE_FROM_FALLBACK = 
%w[
  bdsk-file-1
  bdsk-file-2
  bdsk-file-3
  bdsk-file-4
].map(&:intern).freeze
BIBO_TYPES = 
Hash[*%w[
  article Article
  book Book
  booklet Book
  collection Collection
  conference AcademicArticle
  inbook BookSection
  incollection BookSection
  inproceedings AcademicArticle
  journal Journal
  manual Manual
  mastersthesis Thesis
  online Website
  patent Patent
  periodical Periodical
  phdthesis Thesis
  proceedings Proceedings
  standard Standard
  techreport Report
  thesis Thesis
  unpublished Manuscript
].map(&:intern)].freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bibtex, graph = RDF::Graph.new, agent = {}) ⇒ RDFConverter

Returns a new instance of RDFConverter.

Parameters:



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# File 'lib/bibtex/entry/rdf_converter.rb', line 39

def initialize(bibtex, graph = RDF::Graph.new, agent = {})
  @bibtex = bibtex
  @graph = graph
  @agent = agent
end

Class Method Details

.convert(bibtex, graph = RDF::Graph.new, agent = {}) ⇒ RDF::Graph

converts a BibTeX entry to RDF

Returns:

  • (RDF::Graph) —

    the RDF graph of this entry



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# File 'lib/bibtex/entry/rdf_converter.rb', line 34

def self.convert(bibtex, graph = RDF::Graph.new, agent = {})
  new(bibtex, graph, agent).convert!
end

Instance Method Details

#abstract ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 59

def abstract
  return unless bibtex.field?(:abstract)

  remove_from_fallback(:abstract)

  graph << [entry, RDF::Vocab::DC.abstract, bibtex[:abstract].to_s]
  graph << [entry, bibo[:abstract], bibtex[:abstract].to_s]
end

#annote ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 68

def annote
  return unless bibtex.field?(:annote)

  remove_from_fallback(:annote)

  pub = RDF::Node.new
  graph << [pub, RDF.type, bibo[:Note]]
  graph << [pub, bibo[:content], bibtex[:annote]]

  graph << [entry, bibo[:annotates], pub]
end

#author ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 80

def author
  return unless bibtex.field?(:author)

  remove_from_fallback(:author)

  seq = RDF::Node.new

  graph << [seq, RDF.type, RDF[:Seq]]
  graph << [entry, bibo[:authorList], seq]

  bibtex[:author].each do |name|
    node = agent(name) { create_agent(name, :Person) }

    graph << [entry, RDF::Vocab::DC.creator, node]
    graph << [seq, RDF.li, node]
  end
end

#bdsk_url ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 98

def bdsk_url
  count = 1
  while bibtex.field?("bdsk-url-#{count}".to_sym)
    field = "bdsk-url-#{count}".to_sym
    remove_from_fallback(field)
    graph << [entry, RDF::Vocab::DC.URI, bibtex[field].to_s]
    graph << [entry, bibo[:uri], bibtex[field].to_s]
    count += 1
  end
end

#booktitle ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 109

def booktitle
  return unless bibtex.field?(:booktitle)

  remove_from_fallback(:booktitle)
  return if bibtex.has_parent? &&
            bibtex.parent[:title] == bibtex[:booktitle]
  return if bibtex.has_parent? &&
            bibtex.parent[:booktitle] == bibtex[:booktitle]
  return if bibtex.has_parent? &&
            bibtex.parent[:isbn] == bibtex[:isbn]
  return if bibtex[:title] == bibtex[:booktitle]

  series = RDF::Node.new
  graph << [series, RDF.type, bibo[:Document]]
  graph << [series, RDF::Vocab::DC.title, bibtex[:booktitle].to_s]

  graph << [entry, RDF::Vocab::DC.isPartOf, series]
end

#chapter ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 128

def chapter
  return unless bibtex.field?(:chapter)

  remove_from_fallback(:chapter)

  graph << [entry, bibo[:chapter], bibtex[:chapter].to_s]
end

#children ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 136

def children
  return unless bibtex.has_children?

  bibtex.children.each do |child|
    child_id = RDF::URI.new(child.identifier)
    BibTeX::Entry::RDFConverter.new(child, graph, agent).convert! unless uri_in_graph?(child_id)
    graph << [entry, RDF::Vocab::DC.hasPart, child_id]
  end
end

#convert! ⇒ RDF::Graph

Returns the RDF graph of this entry.

Returns:

  • (RDF::Graph) —

    the RDF graph of this entry



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# File 'lib/bibtex/entry/rdf_converter.rb', line 46

def convert!
  bibtex.parse_names
  bibtex.parse_month

  unless uri_in_graph?(entry)
    methods = self.class.instance_methods(false) - [:convert!]
    methods.each { |m| send(m) }
    run_fallback
  end

  graph
end

#copyright ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 146

def copyright
  return unless bibtex.field?(:copyright)

  remove_from_fallback(:copyright)

  graph << [entry, RDF::Vocab::DC.rightsHolder, bibtex[:copyright].to_s]
end

#date_added ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 154

def date_added
  return unless bibtex.field?(:'date-added')

  remove_from_fallback(:'date-added')

  graph << [entry, RDF::Vocab::DC.created, bibtex[:'date-added'].to_s]
end

#date_modified ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 162

def date_modified
  return unless bibtex.field?(:'date-modified')

  remove_from_fallback(:'date-modified')

  graph << [entry, RDF::Vocab::DC.modified, bibtex[:'date-modified'].to_s]
end

#doi ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 170

def doi
  return unless bibtex.field?(:doi)

  remove_from_fallback(:doi)

  graph << [entry, bibo[:doi], bibtex[:doi].to_s]
  graph << [entry, RDF::Vocab::DC.identifier, "doi:#{bibtex[:doi]}"]
end

#edition ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 179

def edition
  return unless bibtex.field?(:edition)

  remove_from_fallback(:edition)

  graph << [entry, bibo[:edition], bibtex[:edition].to_s]
end

#editor ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 187

def editor
  return unless bibtex.field?(:editor)

  remove_from_fallback(:editor)

  seq = RDF::Node.new

  graph << [seq, RDF.type, RDF[:Seq]]
  graph << [entry, bibo[:editorList], seq]

  bibtex[:editor].each do |name|
    node = agent(name) { create_agent(name, :Person) }

    graph << [entry, bibo.name, node]
    graph << [seq, RDF.li, node]
  end
end

#fallback_default ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 205

def fallback_default
  remove_from_fallback(*DEFAULT_REMOVE_FROM_FALLBACK)
end

#howpublished ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 209

def howpublished
  return unless bibtex.field?(:howpublished)
  return unless bibtex[:howpublished] =~ /^#{URI::DEFAULT_PARSER.make_regexp}$/

  remove_from_fallback(:howpublished)

  graph << [entry, RDF::Vocab::DC.URI, bibtex[:howpublished].to_s]
  graph << [entry, bibo[:uri], bibtex[:howpublished].to_s]
end

#institution ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 219

def institution
  return unless bibtex.field?(:institution)

  remove_from_fallback(:institution)

  org = agent(bibtex[:institution].to_s) { create_agent(bibtex[:institution].to_s, :Organization) }

  graph << [entry, RDF::Vocab::DC.contributor, org]
end

#isbn ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 229

def isbn
  return unless bibtex.field?(:isbn)

  remove_from_fallback(:isbn)

  graph << [entry, bibo[:isbn], bibtex[:isbn].to_s]

  graph << if bibtex.contained?
             [entry, RDF::Vocab::DC.isPartOf, "urn:isbn:#{bibtex[:isbn]}"]
           else
             [entry, RDF::Vocab::DC.identifier, "urn:isbn:#{bibtex[:isbn]}"]
           end
end

#issn ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 243

def issn
  return unless bibtex.field?(:issn)

  remove_from_fallback(:issn)

  graph << [entry, bibo[:issn], bibtex[:issn].to_s]
  graph << if bibtex.contained?
             [entry, RDF::Vocab::DC.isPartOf, "urn:issn:#{bibtex[:issn]}"]
           else
             [entry, RDF::Vocab::DC.identifier, "urn:issn:#{bibtex[:issn]}"]
           end
end

#journal_dc_part_of ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 270

def journal_dc_part_of
  return unless bibtex.field?(:journal)
  return if bibtex.has_parent? && bibtex.parent[:title] == bibtex[:journal]
  return if bibtex.has_parent? && bibtex.parent[:issn] == bibtex[:issn]

  journal = RDF::Node.new
  graph << [journal, RDF.type, bibo[:Journal]]
  graph << [journal, RDF::Vocab::DC.title, bibtex[:journal].to_s]

  graph << [entry, RDF::Vocab::DC.isPartOf, journal]
end

#journal_dc_source ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 256

def journal_dc_source
  return unless bibtex.field?(:journal)

  remove_from_fallback(:journal)

  source = []
  source << bibtex[:journal].to_s
  source << "Vol. #{bibtex[:volume]}" if bibtex.field?(:volume)
  source << "No. #{bibtex[:number]}" if bibtex.field?(:number)
  pagination = bibtex[:pagination] || 'pp.'
  source << "#{pagination} #{bibtex[:pages]}" if bibtex.field?(:pages)
  graph << [entry, RDF::Vocab::DC.source, source.join(', ')]
end

#key ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 282

def key
  graph << [entry, RDF::Vocab::DC.identifier, "urn:bibtex:#{bibtex.key}"]
end

#keywords ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 286

def keywords
  return unless bibtex.field?(:keywords)

  remove_from_fallback(:keywords)

  bibtex[:keywords].to_s.split(/\s*[,;]\s*/).each do |keyword|
    graph << [entry, RDF::Vocab::DC.subject, keyword]
  end
end

#language ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 296

def language
  return unless bibtex.field?(:language)

  remove_from_fallback(:language)

  bibtex[:language] = 'german' if bibtex[:language] == 'ngerman'

  graph << [entry, RDF::Vocab::DC.language, bibtex[:language].to_s]
end

#lccn ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 318

def lccn
  return unless bibtex.field?(:lccn)

  remove_from_fallback(:lccn)

  graph << [entry, bibo[:lccn], bibtex[:lccn].to_s]
end

#location ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 306

def location
  return unless bibtex.field?(:location)

  remove_from_fallback(:location)

  graph << [entry, RDF::Vocab::DC.Location, bibtex[:location].to_s]
  if %i[proceedings inproceedings conference].include?(bibtex.type)
    event = RDF::Vocabulary.new('http://purl.org/NET/c4dm/event.owl')
    graph << [entry, event[:place], org]
  end
end

#note ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 326

def note
  return unless bibtex.field?(:note)

  remove_from_fallback(:note)

  pub = RDF::Node.new
  graph << [pub, RDF.type, bibo[:Note]]
  graph << [pub, bibo[:content], bibtex[:note]]

  graph << [entry, bibo[:annotates], pub]
end

#number ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 338

def number
  return unless bibtex.field?(:number)

  remove_from_fallback(:number)

  graph << case bibtex.type
           when :techreport || :manual || :unpublished
             [entry, bibo[:number], bibtex[:number].to_s]
           else
             [entry, bibo[:issue], bibtex[:number].to_s]
           end
end

#organization ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 351

def organization
  return unless bibtex.field?(:organization)

  remove_from_fallback(:organization)

  org = agent(bibtex[:organization].to_s) { create_agent(bibtex[:organization].to_s, :Organization) }

  graph << [entry, RDF::Vocab::DC.contributor, org]
  graph << [entry, bibo[:organizer], org] if %i[proceedings inproceedings conference].include?(bibtex.type)
end

#pages ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 362

def pages
  return unless bibtex.field?(:pages)

  remove_from_fallback(:pages)

  if bibtex[:pages].to_s =~ /^\s*(\d+)\s*-+\s*(\d+)\s*$/
    graph << [entry, bibo[:pageStart], Regexp.last_match[1]]
    graph << [entry, bibo[:pageEnd], Regexp.last_match[2]]
  else
    graph << [entry, bibo[:pages], bibtex[:pages].to_s]
  end
end

#pagetotal ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 375

def pagetotal
  return unless bibtex.field?(:pagetotal)

  remove_from_fallback(:pagetotal)

  graph << [entry, bibo[:numPages], bibtex[:pagetotal].to_s]
end

#parent ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 383

def parent
  return unless bibtex.has_parent?

  remove_from_fallback(:crossref)

  parent_id = RDF::URI.new(bibtex.parent.identifier)
  BibTeX::Entry::RDFConverter.new(bibtex.parent, graph, agent).convert! unless uri_in_graph?(parent_id)
  graph << [entry, RDF::Vocab::DC.isPartOf, parent_id]
end

#publisher ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 393

def publisher
  return unless bibtex.field?(:publisher, :organization, :school, :institution)

  remove_from_fallback(:publisher, :address)

  org =
    if bibtex.field?(:publisher)
      agent(bibtex[:publisher].to_s) { create_agent(bibtex[:publisher].to_s, :Organization) }
    elsif bibtex.field?(:organization)
      agent(bibtex[:organization].to_s) { create_agent(bibtex[:organization].to_s, :Organization) }
    elsif bibtex.field?(:school)
      agent(bibtex[:school].to_s) { create_agent(bibtex[:school].to_s, :Organization) }
    elsif bibtex.field?(:institution)
      agent(bibtex[:institution].to_s) { create_agent(bibtex[:institution].to_s, :Organization) }
    end

  if bibtex.field?(:address)
    address = RDF::Vocabulary.new('http://schemas.talis.com/2005/address/schema#')
    graph << [org, address[:localityName], bibtex[:address]]
  end

  graph << [entry, RDF::Vocab::DC.publisher, org]
  graph << [entry, bibo[:publisher], org]
end

#school ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 418

def school
  return unless bibtex.field?(:school)

  remove_from_fallback(:school)

  org = agent(bibtex[:school].to_s) { create_agent(bibtex[:school].to_s, :Organization) }

  graph << [entry, RDF::Vocab::DC.contributor, org]
end

#series ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 428

def series
  return unless bibtex.field?(:series)

  remove_from_fallback(:series)
  return if bibtex.has_parent? && bibtex.parent[:title] == bibtex[:series]
  return if bibtex.has_parent? && bibtex.parent[:series] == bibtex[:series]
  return if bibtex.has_parent? && bibtex.parent[:issn] == bibtex[:issn]

  series = RDF::Node.new
  graph << [series, RDF.type, bibo[:MultiVolumeBook]]
  graph << [series, RDF::Vocab::DC.title, bibtex[:series].to_s]

  graph << [entry, RDF::Vocab::DC.isPartOf, series]
end

#thesis_degree ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 443

def thesis_degree
  return unless bibo_class == :Thesis

  degree =
    case bibtex.type
    # ms = masters degree in science
    # Only ma and ms available. We simply chose one.
    when :mastersthesis then bibo['degrees/ms']
    when :phdthesis then bibo['degrees/phd']
    end

  degree =
    case bibtex[:type]
    when 'mathesis' then bibo['degrees/ma']
    when 'phdthesis' then bibo['degrees/phd']
    when /Dissertation/i then bibo['degrees/phd']
    when /Bachelor['s]{0,2} Thesis/i then "Bachelor's Thesis"
    when /Diplomarbeit/i then bibo['degrees/ms']
    when /Magisterarbeit/i then bibo['degrees/ma']
    else degree
    end

  unless degree.nil?
    remove_from_fallback(:type)
    graph << [entry, bibo[:degree], degree]
  end
end

#title ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 471

def title
  return unless bibtex.field?(:title)

  remove_from_fallback(:title)

  title = [bibtex[:title].to_s, bibtex[:subtitle].to_s]
          .reject { |t| t.nil? || t.empty? }
          .join(': ')
  graph << [entry, RDF::Vocab::DC.title, title]
  graph << [entry, bibo[:shortTitle], bibtex[:title].to_s] if bibtex.field?(:subtitle)
end

#translator ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 483

def translator
  return unless bibtex.field?(:translator)

  remove_from_fallback(:translator)

  node = agent(bibtex[:translator].to_s) do
    create_agent(bibtex[:translator].to_s, :Person)
  end

  graph << [entry, RDF::Vocab::DC.contributor, node]
  graph << [entry, bibo[:translator], node]
end

#type ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 496

def type
  graph << [entry, RDF.type, bibo[bibo_class]]

  case bibtex.type
  when :proceedings, :journal
    graph << [entry, RDF::Vocab::DC.type, 'Collection']
  else
    graph << [entry, RDF::Vocab::DC.type, 'Text']
  end
end

#url ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 507

def url
  return unless bibtex.field?(:url)

  remove_from_fallback(:url)

  graph << [entry, RDF::Vocab::DC.URI, bibtex[:url].to_s]
  graph << [entry, bibo[:uri], bibtex[:url].to_s]
end

#volume ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 516

def volume
  return unless bibtex.field?(:volume)

  remove_from_fallback(:volume)

  graph << [entry, bibo[:volume], bibtex[:volume].to_s]
end

#volumes ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 524

def volumes
  return unless bibtex.field?(:volumes)

  remove_from_fallback(:volumes)

  graph << [entry, bibo[:numVolumes], bibtex[:volumes].to_s]
end

#year ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 532

def year
  return unless bibtex.field?(:year)

  remove_from_fallback(:year, :month)

  year = bibtex[:year].to_s
  if bibtex.field?(:month)
    month = BibTeX::Entry::MONTHS.find_index(bibtex[:month].to_s.intern)
    month += 1 unless month.nil?
  end
  date = month.nil? ? year : [year, month].join('-')

  graph << [entry, RDF::Vocab::DC.issued, date]
end