initial commit

1 files changed, 27 insertions, 0 deletions

diff --git a/2021/day2/02b.rkt b/2021/day2/02b.rkt
new file mode 100644
index 0000000..7688c1d
--- /dev/null
+++ b/2021/day2/02b.rkt
@@ -0,0 +1,27 @@
+#lang racket
+
+(define (parse-line line)
+  (define split (string-split line " "))
+  (cond [(empty? split)
+         (datum->syntax #f "")]
+        [else (define command (car split))
+              (define arg (second split))
+              (datum->syntax #f `(,(string->symbol command) ,(string->number arg)))]))
+
+(define (read-syntax path port)
+  (define src-datums (map parse-line (port->lines port)))
+  (datum->syntax #f `(module day2 racket
+                       (define depth 0)
+                       (define pos 0)
+                       (define aim 0)
+                       (define (forward x)
+                         (set! pos (+ pos x))
+                         (set! depth (+ depth (* aim x))))
+                       (define (down x)
+                         (set! aim (+ aim x)))
+                       (define (up x)
+                         (set! aim (- aim x)))
+                       ,@src-datums
+                       (* depth pos))))
+
+(provide read-syntax)