Data commit

Task/Parse-an-IP-Address/Ruby/parse-an-ip-address.rb

@@ -0,0 +1,35 @@
+require 'ipaddr'
+
+
+TESTCASES = ["127.0.0.1",                "127.0.0.1:80",
+                "::1",                      "[::1]:80",
+                "2605:2700:0:3::4713:93e3", "[2605:2700:0:3::4713:93e3]:80"]
+
+output = [%w(String Address Port Family Hex),
+          %w(------ ------- ---- ------ ---)]
+
+def output_table(rows)
+  widths = []
+  rows.each {|row| row.each_with_index {|col, i| widths[i] = [widths[i].to_i, col.to_s.length].max }}
+  format = widths.map {|size| "%#{size}s"}.join("\t")
+  rows.each {|row| puts format % row}
+end
+
+TESTCASES.each do |str|
+  case str  # handle port; IPAddr does not.
+  when /\A\[(?<address> .* )\]:(?<port> \d+ )\z/x      # string like "[::1]:80"
+    address, port = $~[:address], $~[:port]
+  when /\A(?<address> [^:]+ ):(?<port> \d+ )\z/x       # string like "127.0.0.1:80"
+    address, port = $~[:address], $~[:port]
+  else                                                 # string with no port number
+    address, port = str, nil
+  end
+
+  ip_addr = IPAddr.new(address)
+  family = "IPv4" if ip_addr.ipv4?
+  family = "IPv6" if ip_addr.ipv6?
+
+  output << [str, ip_addr.to_s, port.to_s, family, ip_addr.to_i.to_s(16)]
+end
+
+output_table(output)