Class: Identifiers::ArxivId

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

Constant Summary collapse

POST_2007_REGEXP = 
%r{
  (?<=^|[[:space:]/])  # Look-behind for the start of the string, whitespace or a forward slash
  (?:arXiv:)?       # Optional arXiv scheme
  \d{4}             # YYMM (two-digit year and two-digit month number)
  \.
  \d{4,5}           # Zero-padded sequence number of 4- or 5-digits
  (?:v\d+)?         # Literal v followed by version number of 1 or more digits
  (?=$|[[:space:]])    # Look-ahead for end of string or whitespace
}xi
PRE_2007_REGEXP = 
%r{
  (?<=^|[[:space:]/])  # Look-behind for the start of the string, whitespace or a forward slash
  (?:arXiv:)?       # Optional arXiv scheme
  [a-z-]+           # Archive (e.g. "math")
  (?:\.[A-Z]{2})?   # Subject class (where applicable)
  /
  \d{2}             # Year
  (?:0[1-9]|1[012]) # Month
  \d{3}             # Number
  (?:v\d+)?         # Literal v followed by version number of 1 or more digits
  (?=$|[[:space:]])    # Look-ahead for end of string or whitespace
}xi

Class Method Summary collapse

Class Method Details

.extract(str) ⇒ Object 



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# File 'lib/identifiers/arxiv_id.rb', line 25

def self.extract(str)
  extract_pre_2007_arxiv_ids(str) + extract_post_2007_arxiv_ids(str)
end

.extract_post_2007_arxiv_ids(str) ⇒ Object 



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# File 'lib/identifiers/arxiv_id.rb', line 29

def self.extract_post_2007_arxiv_ids(str)
  str.to_s.scan(POST_2007_REGEXP).map { |arxiv_id| arxiv_id.sub(/\AarXiv:/i, '') }
end

.extract_pre_2007_arxiv_ids(str) ⇒ Object 



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# File 'lib/identifiers/arxiv_id.rb', line 33

def self.extract_pre_2007_arxiv_ids(str)
  str.to_s.scan(PRE_2007_REGEXP).map { |arxiv_id| arxiv_id.sub(/\AarXiv:/i, '') }
end