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  unpublished Manuscript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 47

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 42

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 67

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 76

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 88

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 106

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 117

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 136

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 144

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 54

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 154

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 162

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 170

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 178

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 187

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 195

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 213

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 217

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 227

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 237

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 251

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 278

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 264

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 290

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 294

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 304

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 326

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 314

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 334

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 346

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 359

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 370

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 383

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 391

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 401

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 426

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 436

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 451

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 479

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 491

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 504

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 515

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 524

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 532

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 540

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