master
Matthew Butterick 7 years ago
parent 3f17c47d6f
commit 034abe299f

@ -27,6 +27,6 @@
(define (read-syntax path port) (define (read-syntax path port)
(strip-context #`(module mod MOD-PATH (strip-context #`(module mod MOD-PATH
#,@(for/list ([line (in-lines port)]) #,@(for/list ([line (in-lines port)])
(for/list ([datums (in-port read (open-input-string line))]) (for/list ([datums (in-port read (open-input-string (string-replace line "," "")))])
datums))))) datums)))))
. ARGS))) . ARGS)))

@ -0,0 +1,41 @@
#lang reader "../aoc-lang.rkt"
(require sugar/cache)
(provide (rename-out [#%mb #%module-begin]))
(define current-stars (make-parameter #f))
(define-macro (#%mb (STARS) (NAME . TOKS) ...)
#`(#%module-begin
(current-stars 'STARS)
(define names (list 'NAME ...))
(handle (length names) NAME . TOKS) ...))
(define (weights-equal? subsyms)
(or (null? subsyms)
(andmap (λ (ss) (= ((car subsyms) 'wt) (ss 'wt))) (cdr subsyms))))
(define (unique-member ss subsyms)
(= 1 (length (filter (λ (subsym) (= (ss 'wt) (subsym 'wt))) subsyms))))
(define (exceptional-subsym subsyms)
(for/first ([ss (in-list subsyms)] #:when (unique-member ss subsyms)) ss))
(define (typical-subsym subsyms)
(for/first ([ss (in-list subsyms)] #:unless (unique-member ss subsyms)) ss))
(define-macro-cases handle
[(M TARGET-LEN SYM (NUM) -> SUBSYM ...)
#'(begin (define (SYM [x #f])
(match x
['wt (+ NUM (SUBSYM 'wt) ...)]
[(? number?)
(define target-weight x)
(define subsyms (list SUBSYM ...))
(if (weights-equal? subsyms)
(displayln (format "~a is bad: needs to be ~a" 'SYM (- NUM (- (SYM 'wt) target-weight))))
(let ([next-target-weight ((typical-subsym subsyms) 'wt)])
((exceptional-subsym subsyms) next-target-weight)))]
[else (cons 'SYM (append (SUBSYM) ...))]))
(module+ main (when (= TARGET-LEN (length (SYM)))
(case (current-stars)
[() 'SYM]
[else (SYM 0)]))))]
[(M TARGET-LEN SYM (NUM)) #'(M TARGET-LEN SYM (NUM) ->)])

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@ -0,0 +1,14 @@
#lang reader "main.rkt"
pbga (66)
xhth (57)
ebii (61)
havc (66)
ktlj (57)
fwft (72) -> ktlj, cntj, xhth
qoyq (66)
padx (45) -> pbga, havc, qoyq
tknk (41) -> ugml, padx, fwft
jptl (61)
ugml (68) -> gyxo, ebii, jptl
gyxo (61)
cntj (57)

@ -0,0 +1,14 @@
#lang reader "main.rkt" ★★
pbga (66)
xhth (57)
ebii (61)
havc (66)
ktlj (57)
fwft (72) -> ktlj, cntj, xhth
qoyq (66)
padx (45) -> pbga, havc, qoyq
tknk (41) -> ugml, padx, fwft
jptl (61)
ugml (68) -> gyxo, ebii, jptl
gyxo (61)
cntj (57)