+
+ 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]*$/
+ return [{
+ :url => "//www.wikidata.org/wiki/#{value}?uselang=#{I18n.locale}",
+ :title => value
+ }]
+ # Key has to be one of the accepted wikidata-tags
+ elsif key =~ /(architect|artist|brand|operator|subject):wikidata/ &&
+ # Value has to be a semicolon-separated list of wikidata-IDs (whitespaces allowed before and after semicolons)
+ value =~ /^[Qq][1-9][0-9]*(\s*;\s*[Qq][1-9][0-9]*)*$/
+ # 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/wiki/#{id.strip}?uselang=#{I18n.locale}" }
+ end
+ end
+ nil
+ end
+
+ def telephone_link(_key, value)
+ # does it look like a phone number? eg "+1 (234) 567-8901 " ?
+ return nil unless value =~ %r{^\s*\+[\d\s\(\)/\.-]{6,25}\s*$}
+
+ # remove all whitespace instead of encoding it http://tools.ietf.org/html/rfc3966#section-5.1.1
+ # "+1 (234) 567-8901 " -> "+1(234)567-8901"
+ value_no_whitespace = value.gsub(/\s+/, "")
+
+ "tel:#{value_no_whitespace}"
+ end