Class: Identifiers::DOI

Inherits:
Object
  • Object
show all
Defined in:
lib/identifiers/doi.rb

Constant Summary collapse

REGEXP = 
%r{
  \b
  10                                        # Directory indicator (always 10)
  \.
  (?:
    # ISBN-A
    97[89]\.                                # ISBN (GS1) Bookland prefix
    \d{2,8}                                 # ISBN registration group element and publisher prefix
    /                                       # Prefix/suffix divider
    \d{1,7}                                 # ISBN title enumerator and check digit
    |
    # DOI
    \d{4,9}                                 # Registrant code
    /                                       # Prefix/suffix divider
    (?:
      # DOI suffix
      [^[:space:]]+;2-[\#0-9a-z]            # Early Wiley suffix
      |
      [^[:space:]]+                         # Suffix...
      \([^[:space:])]+\)                    # Ending in balanced parentheses...
      (?![^[:space:]\p{P}])                 # Not followed by more suffix
      |
      [^[:space:]]+(?![[:space:]])\p{^P}    # Suffix ending in non-punctuation
    )
    \.{0,3}                                 # Allow a DOI to end with up to 3 .
  )
}x

Class Method Summary collapse

Class Method Details

.extract(str, options = {}) ⇒ Object 



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# File 'lib/identifiers/doi.rb', line 31

def self.extract(str, options = {})
  strict = options.fetch(:strict, false)

  dois = str.to_s.downcase.scan(REGEXP)
  dois = dois.map { |doi| doi.gsub(/\.+$/, '') } unless strict

  dois
end