arx.rb in arx-0.3.1

- old
+ new

@@ -1,23 +1,49 @@
 # frozen_string_literal: true
 
+require 'cgi'
 require 'nokogiri'
 require 'open-uri'
+require 'happymapper'
 require 'arx/version'
+require 'arx/cleaner'
+require 'arx/inspector'
 require 'arx/categories'
-require 'arx/query/query'
+require 'arx/error'
 require 'arx/query/validate'
+require 'arx/query/query'
 require 'arx/entities/author'
 require 'arx/entities/category'
+require 'arx/entities/link'
 require 'arx/entities/paper'
 
 # A Ruby interface for querying academic papers on the arXiv search API.
 module Arx
 
   # The arXiv search API endpoint.
   ENDPOINT = 'http://export.arxiv.org/api/query?'
 
+  # The current arxiv paper identifier scheme (1 April 2007 and onwards).
+  #   The last block of digits can either be five digits (if the paper was published after 1501 - January 2015),
+  #   or four digits (if the paper was published before 1501).
+  #
+  # @see https://arxiv.org/help/arxiv_identifier#new arXiv identifier (new)
+  # @example
+  #   1501.00001
+  #   1705.01662v1
+  #   1412.0135
+  #   0706.0001v2
+  NEW_IDENTIFIER_FORMAT = %r"^\d{4}\.\d{4,5}(v\d+)?$"
+
+  # The legacy arXiv paper identifier scheme (before 1 April 2007).
+  #
+  # @see https://arxiv.org/help/arxiv_identifier#old arXiv identifier (old)
+  # @example
+  #   math/0309136v1
+  #   cond-mat/0211034
+  OLD_IDENTIFIER_FORMAT = %r"^[a-z]+(\-[a-z]+)?\/\d{7}(v\d+)?$"
+
   class << self
 
     # Performs a search query for papers on the arXiv search API.
     #
     # @note The +sort_by+ and +sort_order+ arguments are ignored if passing in your own +query+.
@@ -35,10 +61,10 @@
       end
 
       document = Nokogiri::XML(open ENDPOINT + query.to_s + '&max_results=10000').remove_namespaces!
 
       results = Paper.parse(document, single: false).reject {|paper| paper.id.empty?}
-      raise MissingPaper.new(ids.first) if results.empty? && ids.size == 1
+      raise Error::MissingPaper.new(ids.first) if results.empty? && ids.size == 1
       ids.size == 1 && results.size == 1 ? results.first : results
     end
 
     alias_method :find, :search
     alias_method :get, :search
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