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Task/Parse-an-IP-Address/Racket/parse-an-ip-address.rkt

@@ -0,0 +1,29 @@
+#lang racket
+
+(require net/private/ip)
+
+(define (bytes->hex bs)
+  (string-append* (map (λ(n) (~r n #:base 16 #:min-width 2 #:pad-string "0"))
+                       (bytes->list bs))))
+
+(define (parse-ip str)
+  (define-values [ipstr portstr]
+    (match str
+      [(regexp #rx"^([0-9.]+):([0-9]+)$" (list _ i p)) (values i p)]
+      [(regexp #rx"^\\[([0-9a-fA-F:]+)\\]:([0-9]+)$" (list _ i p)) (values i p)]
+      [_ (values str "")]))
+  (define ip (make-ip-address ipstr))
+  (define 4? (ipv4? ip))
+  (define hex (bytes->hex ((if 4? ipv4-bytes ipv6-bytes) ip)))
+  (displayln (~a (~a str #:min-width 30)
+                 " "
+                 (~a hex #:min-width 32 #:align 'right)
+                 " ipv" (if 4? "4" "6") " " portstr)))
+
+(for-each parse-ip
+          '("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"))