+ url
+ end
+
+ def wikipedia_link(key, value)
+ # Some k/v's are wikipedia=http://en.wikipedia.org/wiki/Full%20URL
+ return nil if value =~ %r{^https?://}
+
+ if key == "wikipedia"
+ # This regex should match Wikipedia language codes, everything
+ # from de to zh-classical
+ lang = if value =~ /^([a-z-]{2,12}):(.+)$/i
+ # Value is <lang>:<title> so split it up
+ # Note that value is always left as-is, see: https://trac.openstreetmap.org/ticket/4315
+ Regexp.last_match(1)
+ else
+ # Value is <title> so default to English Wikipedia
+ "en"
+ end
+ elsif key =~ /^wikipedia:(\S+)$/
+ # Language is in the key, so assume value is the title
+ lang = Regexp.last_match(1)
+ else
+ # Not a wikipedia key!
+ return nil
+ end
+
+ if value =~ /^([^#]*)#(.*)/
+ # Contains a reference to a section of the wikipedia article
+ # Must break it up to correctly build the url
+ value = Regexp.last_match(1)
+ section = "#" + Regexp.last_match(2)
+ encoded_section = "#" + URI.encode(Regexp.last_match(2).gsub(/ +/, "_"), /[^A-Za-z0-9:_]/).tr("%", ".")
+ else
+ section = ""
+ encoded_section = ""
+ end
+
+ {
+ :url => "http://#{lang}.wikipedia.org/wiki/#{value}?uselang=#{I18n.locale}#{encoded_section}",
+ :title => value + section
+ }
+ end
+
+ 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}"