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
    [^[:space:]]+ # DOI suffix
  )
}x
VALID_ENDING = 
/
  (?:
    \p{^Punct} # Non-punctuation character
    |
    \(.+\)     # Balanced parentheses
    |
    2-\#       # Early Wiley DOI suffix
  )
  \z
/x

Class Method Summary collapse

Class Method Details

.extract(str) ⇒ Object 



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

def self.extract(str)
  str.to_s.downcase.scan(REGEXP).map { |doi| extract_one(doi) }.compact
end

.extract_one(str) ⇒ Object 



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# File 'lib/identifiers/doi.rb', line 35

def self.extract_one(str)
  while (match = str.to_s.downcase[REGEXP])
    break match if match =~ VALID_ENDING

    str = match.sub(/\p{Punct}\z/, '')
  end
end