+
+ def wikidata_links(key, value)
+ # The simple wikidata-tag (this is limited to only one value)
+ if key == "wikidata" && value =~ /^[Qq][1-9][0-9]*$/
+ return [{
+ :url => "//www.wikidata.org/entity/#{value}?uselang=#{I18n.locale}",
+ :title => value
+ }]
+ # Key has to be one of the accepted wikidata-tags
+ elsif key =~ /(architect|artist|brand|name:etymology|network|operator|subject):wikidata/ &&
+ # Value has to be a semicolon-separated list of wikidata-IDs (whitespaces allowed before and after semicolons)
+ value =~ /^[Qq][1-9][0-9]*(\s*;\s*[Qq][1-9][0-9]*)*$/
+ # Splitting at every semicolon to get a separate hash for each wikidata-ID
+ return value.split(";").map do |id|
+ { :title => id, :url => "//www.wikidata.org/entity/#{id.strip}?uselang=#{I18n.locale}" }
+ end
+ end
+ nil
+ end
+
+ def telephone_links(_key, value)
+ # Does it look like a global phone number? eg "+1 (234) 567-8901 "
+ # or a list of alternate numbers separated by ;
+ #
+ # Per RFC 3966, this accepts the visual separators -.() within the number,
+ # which are displayed and included in the tel: URL, and accepts whitespace,
+ # which is displayed but not included in the tel: URL.
+ # (see: http://tools.ietf.org/html/rfc3966#section-5.1.1)
+ #
+ # Also accepting / as a visual separator although not given in RFC 3966,
+ # because it is used as a visual separator in OSM data in some countries.
+ if value =~ %r{^\s*\+[\d\s\(\)/\.-]{6,25}\s*(;\s*\+[\d\s\(\)/\.-]{6,25}\s*)*$}
+ return value.split(";").map do |phone_number|
+ # for display, remove leading and trailing whitespace
+ phone_number = phone_number.strip
+
+ # for tel: URL, remove all whitespace
+ # "+1 (234) 567-8901 " -> "tel:+1(234)567-8901"
+ phone_no_whitespace = phone_number.gsub(/\s+/, "")
+ { :phone_number => phone_number, :url => "tel:#{phone_no_whitespace}" }
+ end
+ end
+ nil
+ end