Class: BibTeX::Entry

Inherits:
Element show all
Extended by:
Forwardable
Includes:
Enumerable
Defined in:
lib/bibtex/entry.rb

Overview

Represents a regular BibTeX entry.

Defined Under Namespace

Classes: BibTeXMLConverter, CiteProcConverter, RDFConverter

Constant Summary collapse

REQUIRED_FIELDS =

Defines the required fields of the standard entry types

Hash.new([]).merge({
  :article       => [:author,:title,:journal,:year],
  :book          => [[:author,:editor],:title,:publisher,:year],
  :booklet       => [:title],
  :conference    => [:author,:title,:booktitle,:year],
  :inbook        => [[:author,:editor],:title,[:chapter,:pages],:publisher,:year],
  :incollection  => [:author,:title,:booktitle,:publisher,:year],
  :inproceedings => [:author,:title,:booktitle,:year],
  :manual        => [:title],
  :mastersthesis => [:author,:title,:school,:year],
  :misc          => [],
  :phdthesis     => [:author,:title,:school,:year],
  :proceedings   => [:title,:year],
  :techreport    => [:author,:title,:institution,:year],
  :unpublished   => [:author,:title,:note]
}).freeze
FIELD_ALIASES =

Defines the default fallbacks for values defined in cross-references

{
  :booktitle => :title,
  # :editor => :author
}.freeze
NAME_FIELDS = 
[:author,:editor,:translator,:director,:producer,:composer].freeze
DATE_FIELDS = 
[:year,:month,:day,:date].freeze
MONTHS = 
[:jan,:feb,:mar,:apr,:may,:jun,:jul,:aug,:sep,:oct,:nov,:dec].freeze
MONTHS_FILTER = 
Hash.new do |h,k|
  case k.to_s.strip
  when /^(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)/i
    h[k] = Value.new(k.to_s[0,3].downcase.to_sym)
  when /^\d\d?$/
    h[k] = Value.new(MONTHS[k.to_i - 1] || k)
  else
    h[k] = Value.new(k)
  end
end

Instance Attribute Summary collapse

Attributes inherited from Element

#bibliography

Instance Method Summary collapse

Methods inherited from Element

#inspect, #matches?, #meets?, #meets_all?, #meets_any?, parse, #to_json, #to_yaml

Constructor Details

#initialize(attributes = {}) {|_self| ... } ⇒ Entry

Creates a new instance. If a hash is given, the entry is populated accordingly.

Yields:

  • (_self)

Yield Parameters:

  • _self (BibTeX::Entry) —

    the object that the method was called on



73
74
75
76
77
78
79
80
81
82
 
# File 'lib/bibtex/entry.rb', line 73

def initialize(attributes = {})
  @fields = {}

  self.type = attributes.delete(:bibtex_type) if attributes.has_key?(:bibtex_type)
  self.key = attributes.delete(:bibtex_key) if attributes.has_key?(:bibtex_key)

  add(attributes)

  yield self if block_given?
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



301
302
303
304
305
306
307
308
309
310
311
312
313
314
 
# File 'lib/bibtex/entry.rb', line 301

def method_missing(name, *args, &block)
  case
  when fields.has_key?(name)
    fields[name]
  when name.to_s =~ /^(.+)=$/
    send(:add, $1.to_sym, args[0])
  when name =~ /^(?:convert|from)_([a-z]+)(!)?$/
    $2 ? convert!($1, &block) : convert($1, &block)
  when has_parent? && parent.provides?(name)
    parent.provide(name)
  else
    super
  end
end

Instance Attribute Details

#fields ⇒ Object (readonly)

Returns the value of attribute fields.



68
69
70
 
# File 'lib/bibtex/entry.rb', line 68

def fields
  @fields
end

#type ⇒ Object

Returns the value of attribute type.



68
69
70
 
# File 'lib/bibtex/entry.rb', line 68

def type
  @type
end

Instance Method Details

#<=>(other) ⇒ Object 



626
627
628
 
# File 'lib/bibtex/entry.rb', line 626

def <=>(other)
  type != other.type ? type <=> other.type : key != other.key ? key <=> other.key : to_s <=> other.to_s
end

#[](name) ⇒ Object Also known as: get

Returns the value of the field with the given name. If the value is not defined and the entry has cross-reference, returns the cross-referenced value instead.



345
346
347
 
# File 'lib/bibtex/entry.rb', line 345

def [](name)
  fields[name.to_sym] || parent && parent.provide(name)
end

#[]=(name, value) ⇒ Object

Adds a new field (name-value pair) to the entry. Returns the new value.



357
358
359
 
# File 'lib/bibtex/entry.rb', line 357

def []=(name, value)
  add(name.to_sym, value)
end

#add(*arguments) ⇒ Object Also known as: <<

call-seq:

add(:author, "Edgar A. Poe")
add(:author, "Edgar A. Poe", :title, "The Raven")
add([:author, "Edgar A. Poe", :title, "The Raven"])
add(:author => "Edgar A. Poe", :title => "The Raven")
add(:author => Names.new(Name.new(:first => 'Edgar A.', :last => 'Poe')))

Adds a new field (name-value pair) or multiple fields to the entry. Returns the entry for chainability.



370
371
372
373
374
375
376
 
# File 'lib/bibtex/entry.rb', line 370

def add(*arguments)
  Hash[*arguments.flatten].each_pair do |name, value|
    fields[name.to_sym] = Value.create(value)
  end

  self
end

#added_to_bibliography(bibliography) ⇒ Object

Called when the element was added to a bibliography.



433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
 
# File 'lib/bibtex/entry.rb', line 433

def added_to_bibliography(bibliography)
  super

  @key = register(key)

  [:parse_names, :parse_months].each do |parser|
    send(parser) if bibliography.options[parser]
  end

  if bibliography.options.has_key?(:filter)
    [*bibliography.options[:filter]].each do |filter|
      convert!(filter)
    end
  end

  self
end

#aliases ⇒ Object

Returns the Entry’s field name aliases.



172
173
174
 
# File 'lib/bibtex/entry.rb', line 172

def aliases
  @aliases ||= FIELD_ALIASES.dup
end

#children ⇒ Object Also known as: cross_referenced_by

Returns a list of all entries in the Bibliography containing a cross-reference to this entry or [] if there are no references to this entry.



575
576
577
 
# File 'lib/bibtex/entry.rb', line 575

def children
  bibliography && bibliography.q("@entry[crossref=#{key}]") or []
end

#contained? ⇒ Boolean

Returns true if this entry is published inside a book, collection or journal

Returns:

  • (Boolean) 


594
595
596
597
 
# File 'lib/bibtex/entry.rb', line 594

def contained?
  has_field?(:container, :journal) ||
    has_field?(:booktitle) && get(:booktitle) != get(:title)
end

#container_title ⇒ Object 



581
582
583
 
# File 'lib/bibtex/entry.rb', line 581

def container_title
  get(:booktitle) || get(:journal) || get(:container)
end

#content(options = {}) ⇒ Object

Returns a string of all the entry’s fields.



632
633
634
 
# File 'lib/bibtex/entry.rb', line 632

def content(options = {})
  fields.map { |k,v| "#{k} = #{ fields[k].to_s(options) }" }.join(",\n")
end

#convert(*filters) ⇒ Object

Returns a duplicate entry with all values converted using the filter(s). If an optional block is given, only those values will be converted where the block returns true (the block will be called with each key-value pair).

See Also:



611
612
613
 
# File 'lib/bibtex/entry.rb', line 611

def convert(*filters)
  block_given? ? dup.convert!(*filters, &Proc.new) : dup.convert!(*filters)
end

#convert!(*filters) ⇒ Object

In-place variant of @see #convert



616
617
618
619
620
621
622
623
624
 
# File 'lib/bibtex/entry.rb', line 616

def convert!(*filters)
  filters = filters.flatten.map { |f| Filters.resolve!(f) }

  fields.each_pair do |k, v|
    (!block_given? || yield(k, v)) ? v.convert!(*filters) : v
  end

  self
end

#date ⇒ Object 



515
516
517
 
# File 'lib/bibtex/entry.rb', line 515

def date
  get(:date) || get(:year)
end

#delete(name) ⇒ Object

Removes the field with a given name from the entry. Returns the value of the deleted field; nil if the field was not set.



382
383
384
 
# File 'lib/bibtex/entry.rb', line 382

def delete(name)
  fields.delete(name.to_sym)
end

#digest(filter = []) ⇒ String

Creates the entry’s digest based on the passed-in filters.

The digest contains the type and all key-value pairs based on the passed in filter.

If a block is given, the computed digest will be passed to the block for post-processing (the entry itself will be passed as the second parameter).

Parameters:

  • the (<Symbol>) —

    field names to use

Returns:

  • (String) —

    the digest string

See Also:



407
408
409
410
411
412
413
414
415
416
417
 
# File 'lib/bibtex/entry.rb', line 407

def digest(filter = [])
  names = field_names(filter)
  digest = type.to_s

  names.zip(values_at(*names)).each do |key, value|
    digest << "|#{key}:#{value}"
  end

  digest = yield(digest, self) if block_given?
  digest
end

#each ⇒ Object Also known as: each_pair

call-seq:

entry.each      { |key, value| block } -> entry
entry.each_pair { |key, value| block } -> entry
entry.each                             -> an_enumerator
entry.each_pair                        -> an_enumerator

Calls block once for each key in entry, passing the key-value pair as parameters.

If no block is given, an enumerator is returned instead.



159
160
161
162
163
164
165
166
 
# File 'lib/bibtex/entry.rb', line 159

def each
  if block_given?
    fields.each(&Proc.new)
    self
  else
    to_enum
  end
end

#fetch(name, default = nil) ⇒ Object 



351
352
353
 
# File 'lib/bibtex/entry.rb', line 351

def fetch(name, default = nil)
  get(name) || (block_given? ? yield(name) : default)
end

#field_names(filter = [], include_inherited = true) ⇒ Object

Returns a sorted list of the Entry’s field names. If a filter is passed as argument, returns all field names that are also defined by the filter. If the filter is empty, returns all field names.

If the second optional argument is true (default) and the Entry contains a cross-reference, the list will include all inherited fields.



274
275
276
277
278
279
280
281
282
283
284
285
286
287
 
# File 'lib/bibtex/entry.rb', line 274

def field_names(filter = [], include_inherited = true)
  names = fields.keys

  if include_inherited && has_parent?
    names.concat(inherited_fields)
  end

  unless filter.empty?
    names = names & filter.map(&:to_sym)
  end

  names.sort!
  names
end

#has_children? ⇒ Boolean Also known as: cross_referenced?

Returns true if the entry is cross-referenced by another entry in the Bibliography.

Returns:

  • (Boolean) 


566
567
568
 
# File 'lib/bibtex/entry.rb', line 566

def has_children?
  !children.empty?
end

#has_field?(*names) ⇒ Boolean Also known as: field?

Returns:

  • (Boolean) 


218
219
220
221
222
 
# File 'lib/bibtex/entry.rb', line 218

def has_field?(*names)
  names.flatten.any? do |name|
    name.respond_to?(:to_sym) ? fields.has_key?(name.to_sym) : false
  end
end

#has_parent? ⇒ Boolean Also known as: has_cross_reference?

Returns true if the Entry has a valid cross-reference in the Bibliography.

Returns:

  • (Boolean) 


541
542
543
 
# File 'lib/bibtex/entry.rb', line 541

def has_parent?
  !parent.nil?
end

#has_type?(type) ⇒ Boolean Also known as: type?

Returns:

  • (Boolean) 


211
212
213
 
# File 'lib/bibtex/entry.rb', line 211

def has_type?(type)
  type.to_s.match(/^(?:entry|\*)$/i) || @type == type.to_sym || super
end

#identifier ⇒ Object 



419
420
421
422
423
424
425
426
427
428
429
430
 
# File 'lib/bibtex/entry.rb', line 419

def identifier
  case
  when provides?(:doi)
    "info:doi/#{get(:doi)}"
  when provides?(:isbn)
    "urn:isbn:#{get(:isbn)}"
  when provides?(:issn)
    "urn:issn:#{get(:issn)}"
  else
    "urn:bibtex:#{key}"
  end
end

#inherited_fields ⇒ Object

Returns a sorted list of all field names referenced by this Entry’s cross-reference.



290
291
292
293
294
295
296
297
298
 
# File 'lib/bibtex/entry.rb', line 290

def inherited_fields
  return [] unless has_parent?

  names = parent.fields.keys - fields.keys
  names.concat(parent.aliases.reject { |k,v| !parent.has_field?(v) }.keys)
  names.sort!

  names
end

#inherits?(*names) ⇒ Boolean

Returns:

  • (Boolean) 


226
227
228
229
230
 
# File 'lib/bibtex/entry.rb', line 226

def inherits?(*names)
  names.flatten.any? do |name|
    !has_field(name) && has_parent? && parent.provides?(name)
  end
end

#initialize_copy(other) ⇒ Object 



84
85
86
87
88
89
90
91
 
# File 'lib/bibtex/entry.rb', line 84

def initialize_copy(other)
  @fields = {}

  self.type = other.type
  self.key = other.key

  add(other.fields)
end

#join ⇒ Object 



483
484
485
486
 
# File 'lib/bibtex/entry.rb', line 483

def join
  fields.values.each(&:join)
  self
end

#key ⇒ Object Also known as: id 



195
196
197
198
199
200
201
 
# File 'lib/bibtex/entry.rb', line 195

def key
  if @key.nil? || @key.empty?
    @key = default_key
  else
    @key
  end
end

#key=(key) ⇒ Object Also known as: id=

Sets the Entry’s key. If the Entry is currently registered with a Bibliography, re-registers the Entry with the new key; note that this may change the key value if another Entry is already regsitered with the same key.

Returns the new key.



182
183
184
185
186
187
188
189
190
191
192
193
 
# File 'lib/bibtex/entry.rb', line 182

def key=(key)
  key = key.to_s

  if registered?
    bibliography.entries.delete(@key)
    key = register(key)
  end

  @key = key
rescue => e
  raise BibTeXError, "failed to set key to #{key.inspect}: #{e.message}"
end

#merge(other, filter = field_names) ⇒ Object 



93
94
95
 
# File 'lib/bibtex/entry.rb', line 93

def merge(other, filter = field_names)
  dup.merge!(other, filter)
end

#merge!(other, filter = field_names) ⇒ Object

Raises:

  • (InvalidArgument) 


97
98
99
100
101
102
103
104
105
106
107
108
109
110
 
# File 'lib/bibtex/entry.rb', line 97

def merge!(other, filter = field_names)
  raise InvalidArgument, "failed to merge entries: type mismatch: #{type} #{other.type}" unless
    type == other.type

  other.each do |name, value|
    if has_field?(name)
      get(name).merge!(value) if filter.include?(name)
    else
      add name, value.dup
    end
  end

  self
end

#month=(month) ⇒ Object 



488
489
490
491
492
 
# File 'lib/bibtex/entry.rb', line 488

def month=(month)
  fields[:month] = month
ensure
  parse_month
end

#month_numeric ⇒ Object 



494
495
496
497
498
499
 
# File 'lib/bibtex/entry.rb', line 494

def month_numeric
  return unless has_field?(:month)
  return unless (num = MONTHS.index fields[:month].to_sym)

  num.succ
end

#names ⇒ Object

Returns a list of all names (authors, editors, translators).



535
536
537
 
# File 'lib/bibtex/entry.rb', line 535

def names
  NAME_FIELDS.map { |k| has_field?(k) ? @fields[k].tokens : nil }.flatten.compact
end

#pages_from ⇒ Object 



585
586
587
 
# File 'lib/bibtex/entry.rb', line 585

def pages_from
  fetch(:pages, '').split(/\D+/)[0]
end

#pages_to ⇒ Object 



589
590
591
 
# File 'lib/bibtex/entry.rb', line 589

def pages_to
  fetch(:pages, '').split(/\D+/)[-1]
end

#parent ⇒ Object Also known as: cross_reference

Returns the cross-referenced Entry from the Bibliography or nil if this Entry does define a cross-reference.



557
558
559
 
# File 'lib/bibtex/entry.rb', line 557

def parent
  bibliography && bibliography[fields[:crossref]]
end

#parent_missing? ⇒ Boolean Also known as: cross_reference_missing?

Returns true if the Entry cross-references an Entry which is not registered in the current Bibliography.

Returns:

  • (Boolean) 


549
550
551
 
# File 'lib/bibtex/entry.rb', line 549

def parent_missing?
  has_field?(:crossref) && !has_parent?
end

#parse_month ⇒ Object Also known as: parse_months 



501
502
503
504
505
506
507
508
509
510
511
 
# File 'lib/bibtex/entry.rb', line 501

def parse_month
  fields.delete(:month_numeric)
  return unless has_field?(:month)

  fields[:month] = MONTHS_FILTER[fields[:month]]

  numeric = MONTHS.index(fields[:month].to_sym)
  fields[:month_numeric] = Value.new(numeric.succ) if numeric

  self
end

#parse_names ⇒ Object

Parses all name values of the entry. Tries to replace and join the value prior to parsing.



521
522
523
524
525
526
527
528
529
530
531
532
 
# File 'lib/bibtex/entry.rb', line 521

def parse_names
  strings = bibliography ? bibliography.strings.values : []

  NAME_FIELDS.each do |key|
    if name = fields[key]
      name = name.dup.replace(strings).join.to_name
      fields[key] = name unless name.nil?
    end
  end

  self
end

#provide(name) ⇒ Object

Returns the field value referenced by the passed-in name. For example, this will return the ‘title’ value for ‘booktitle’ if a corresponding alias is defined.



250
251
252
253
254
 
# File 'lib/bibtex/entry.rb', line 250

def provide(name)
  return nil unless name.respond_to?(:to_sym)
  name = name.to_sym
  fields[name] || fields[aliases[name]]
end

#provides?(*names) ⇒ Boolean

Returns true if the Entry has a field (or alias) for any of the passed-in names.

Returns:

  • (Boolean) 


233
234
235
236
237
238
239
240
241
 
# File 'lib/bibtex/entry.rb', line 233

def provides?(*names)
  names.flatten.any? do |name|
    if name.respond_to?(:to_sym)
      has_field?(name) || has_field?(aliases[name.to_sym])
    else
      false
    end
  end
end

#provides_or_inherits?(*names) ⇒ Boolean

Returns:

  • (Boolean) 


243
244
245
 
# File 'lib/bibtex/entry.rb', line 243

def provides_or_inherits?(*names)
  provides?(names) || inherits?(names)
end

#register(key) ⇒ Object

Registers this Entry in the associated Bibliographies entries hash. This method may change the Entry’s key, if another entry is already registered with the current key.

Returns the key or nil if the Entry is not associated with a Bibliography.



468
469
470
471
472
473
474
475
 
# File 'lib/bibtex/entry.rb', line 468

def register(key)
  return nil if bibliography.nil?

  k = key.dup
  k.succ! while bibliography.has_key?(k)
  bibliography.entries[k] = self
  k
end

#registered? ⇒ Boolean

Returns true if the Entry is currently registered with the associated Bibliography.

Returns:

  • (Boolean) 


459
460
461
 
# File 'lib/bibtex/entry.rb', line 459

def registered?
  !!(bibliography && bibliography.entries[key].equal?(self))
end

#removed_from_bibliography(bibliography) ⇒ Object

Called when the element was removed from a bibliography.



452
453
454
455
456
 
# File 'lib/bibtex/entry.rb', line 452

def removed_from_bibliography(bibliography)
  super
  bibliography.entries.delete(key)
  self
end

#rename(*arguments) ⇒ Object Also known as: rename_fields

Returns a copy of the Entry with all the field names renamed.



323
324
325
 
# File 'lib/bibtex/entry.rb', line 323

def rename(*arguments)
  dup.rename!(*arguments)
end

#rename!(*arguments) ⇒ Object Also known as: rename_fields!

Renames the given field names unless a field with the new name already exists.



329
330
331
332
333
334
335
336
337
 
# File 'lib/bibtex/entry.rb', line 329

def rename!(*arguments)
  Hash[*arguments.flatten].each_pair do |from,to|
    if fields.has_key?(from) && !fields.has_key?(to)
      fields[to] = fields[from]
      fields.delete(from)
    end
  end
  self
end

#replace(*arguments) ⇒ Object 



477
478
479
480
481
 
# File 'lib/bibtex/entry.rb', line 477

def replace(*arguments)
  arguments = bibliography.q('@string') if arguments.empty?
  fields.values.each { |v| v.replace(*arguments) }
  self
end

#respond_to?(method, include_all = false) ⇒ Boolean

Returns:

  • (Boolean) 


316
317
318
319
320
 
# File 'lib/bibtex/entry.rb', line 316

def respond_to?(method, include_all=false)
  provides?(method.to_sym) || method.to_s.match(/=$/) ||
    method =~ /^(?:convert|from)_([a-z]+)(!)?$/ ||
    (has_parent? && parent.respond_to?(method, include_all)) || super
end

#save_inherited_fields ⇒ Object

If the Entry has a cross-reference, copies all referenced all inherited values from the parent.

Returns the Entry.



260
261
262
263
264
265
266
 
# File 'lib/bibtex/entry.rb', line 260

def save_inherited_fields
  inherited_fields.each do |name|
    fields[name] = parent.provide(name)
  end

  self
end

#to_citeproc(options = {}) ⇒ Object 



649
650
651
 
# File 'lib/bibtex/entry.rb', line 649

def to_citeproc(options = {})
  CiteProcConverter.convert(self, options)
end

#to_hash(options = {}) ⇒ Object 



642
643
644
645
646
647
 
# File 'lib/bibtex/entry.rb', line 642

def to_hash(options = {})
  options[:quotes] ||= %w({ })
  hash = { :bibtex_key => key, :bibtex_type => type }
  each_pair { |k,v| hash[k] = v.to_s(options) }
  hash
end

#to_rdf(options = {}) ⇒ Object Also known as: to_bibo

Returns a RDF::Graph representation of the entry using the BIBO ontology.



658
659
660
661
662
663
664
 
# File 'lib/bibtex/entry.rb', line 658

def to_rdf(options = {})
  if defined?(::RDF)
    RDFConverter.convert(self)
  else
    BibTeX.log.error 'Please `gem install rdf` for RDF support.'
  end
end

#to_s(options = {}) ⇒ Object

Returns a string representation of the entry.



637
638
639
640
 
# File 'lib/bibtex/entry.rb', line 637

def to_s(options = {})
  options[:quotes] ||= %w({ })
  ["@#{type}{#{key},", content(options).gsub(/^/,'  '), "}\n"].join("\n")
end

#to_xml(options = {}) ⇒ Object 



653
654
655
 
# File 'lib/bibtex/entry.rb', line 653

def to_xml(options = {})
  BibTeXMLConverter.convert(self, options)
end

#update(fields) ⇒ Object 



112
113
114
115
116
117
118
 
# File 'lib/bibtex/entry.rb', line 112

def update(fields)
  fields.each do |name, value|
    add name, value
  end

  self
end

#valid? ⇒ Boolean

Returns false if the entry is one of the standard entry types and does not have definitions of all the required fields for that type.

Returns:

  • (Boolean) 


388
389
390
391
392
 
# File 'lib/bibtex/entry.rb', line 388

def valid?
  REQUIRED_FIELDS[type].all? do |f|
    f.is_a?(Array) ? !(f & fields.keys).empty? : !fields[f].nil?
  end
end

#values_at(*arguments) ⇒ Object

Returns an array containing the values associated with the given keys.



600
601
602
603
604
 
# File 'lib/bibtex/entry.rb', line 600

def values_at(*arguments)
  arguments.map do |key|
    get key
  end
end

#year ⇒ Object 



668
669
670
671
672
673
 
# File 'lib/bibtex/entry.rb', line 668

def year
  return fields[:year] if has_field?(:year)
  return unless has_field?(:date)

  fields[:date].to_s[/\d{4}/]
end