From 05f1f914dbcb84dab15935462aeaf561e5134a22 Mon Sep 17 00:00:00 2001
From: Matthew Butterick <mb@mbtype.com>
Date: Mon, 12 Dec 2016 07:40:13 -0800
Subject: [PATCH] finish day10

---
 2016/day10/lang.rkt | 64 ++++++++++++++++++++-------------------------
 1 file changed, 29 insertions(+), 35 deletions(-)

diff --git a/2016/day10/lang.rkt b/2016/day10/lang.rkt
index 601b74d..5180871 100644
--- a/2016/day10/lang.rkt
+++ b/2016/day10/lang.rkt
@@ -1,50 +1,44 @@
 #lang br/quicklang
-(require racket/string (for-syntax syntax/strip-context))
 ;; http://adventofcode.com/2016/day/10
-
 (provide read-syntax)
 (define (read-syntax path port)
   (strip-bindings
    #`(module mod "lang.rkt"
        #,@(for/list ([str (in-lines port)]
                      #:when (not (equal? str "")))
-            (format-datum '~a str)))))
+            `(handle ,@(string-split str))))))
 
-(define-macro (mb ARG ...)
+(define chip-comparison-key '(17 61))
+(define-macro (mb . ARGS)
   #'(#%module-begin
-     ARG ...
-     ))
+     (begin . ARGS)
+     (displayln
+      (for/first ([(k v) (in-hash gates)]
+                  #:when (equal? (sort (apply eval-gate k) <)
+                                 (sort chip-comparison-key <)))
+        k))
+     (displayln (for/product ([i (in-range 3)])
+                  (gate-low "output" (~a i))))))
 (provide (rename-out [mb #%module-begin]))
 
-(define bots (make-hash))
-(define outputs (make-hash))
-
-(define chip-comparison-key '(17 61))
-(define-macro (value VAL goes to TYPE NUM)
-  (with-pattern ([HASH-NAME (replace-context #'here (suffix-id #'TYPE "s"))])
-    #'(begin
-        (hash-update! HASH-NAME NUM (λ (val) (cons VAL val)) empty)
-        #;(displayln (format "bots: ~v" bots))
-        #;(displayln (format "outputs: ~v" outputs)))))
-(provide value)
+(define gates (make-hash))
 
-(define (bot-low bot)
-  (define botvals (hash-ref bots bot))
-  (define minval (car (sort botvals <)))
-  (hash-set! bots bot (remove minval botvals))
-  minval)
+(define-macro-cases handle
+  [(_ "value" VAL "goes" "to" TYPE NUM)
+   #'(hash-update! gates (list TYPE NUM) (λ (val) (cons (λ () (let ([v VAL])
+                                                                (if (string? v)
+                                                                    (string->number v)
+                                                                    v))) val)) empty)]
+  [(_ "bot" BOT "gives" "low" "to" LOW-TYPE LOW-NUM "and" "high" "to" HIGH-TYPE HIGH-NUM)
+   #'(begin
+       (handle "value" (gate-low "bot" BOT) "goes" "to" LOW-TYPE LOW-NUM)
+       (handle "value" (gate-high "bot" BOT) "goes" "to" HIGH-TYPE HIGH-NUM))])
+(provide handle)
 
-(define (bot-high bot)
-  (define botvals (hash-ref bots bot))
-  (define maxval (car (sort botvals >)))
-  (hash-set! bots bot (remove maxval botvals))
-  maxval)
+(require sugar/cache)
+(define/caching (eval-gate type num)
+  (for/list ([proc (in-list (hash-ref gates (list type num)))])
+    (proc)))
 
-; bot BOT gives low to LOW-TYPE LOW-NUM and high to HIGH-TYPE HIGH-NUM
-(define-macro (bot BOT gives low to LOW-TYPE LOW-NUM and high to HIGH-TYPE HIGH-NUM)
-  #'(module+ main
-      (when (equal? (sort (hash-ref bots BOT) <) (sort chip-comparison-key <))
-        (displayln (format "answer: bot ~a holds ~a chips" BOT chip-comparison-key)))
-      (value (bot-low BOT) goes to LOW-TYPE LOW-NUM)
-      (value (bot-high BOT) goes to HIGH-TYPE HIGH-NUM)))
-(provide bot and)
\ No newline at end of file
+(define (gate-low type num) (car (sort (eval-gate type num) <)))
+(define (gate-high type num) (car (sort (eval-gate type num) >)))