You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
This repo is archived. You can view files and clone it, but cannot push or open issues/pull-requests.
aoc-racket/2016/day03/lang-b.rkt

28 lines
907 B
Racket

8 years ago
#lang br/quicklang
(require sugar/list)
8 years ago
(define (read-syntax path port)
8 years ago
(define triads (slice-at (map string-split (string-split (port->string port) "\n")) 3))
(define new-triples
(slice-at (flatten (for/list ([triad (in-list triads)])
(apply map list triad))) 3))
(strip-bindings
8 years ago
#`(module mod "lang-b.rkt"
8 years ago
#,@(for*/list ([triple (in-list new-triples)])
8 years ago
`(triangle ,@triple)))))
8 years ago
(provide read-syntax)
8 years ago
(define-macro (mb . TRIANGLES)
#'(#%module-begin
(length (filter valid-triangle? (list . TRIANGLES)))))
(provide (rename-out [mb #%module-begin]))
(define-macro (triangle A B C)
8 years ago
#'(map string->number (list A B C)))
8 years ago
(provide triangle)
(define (valid-triangle? triangle)
(match-define (list a b c) triangle)
(and (> (+ a b) c)
(> (+ b c) a)
(> (+ a c) b)))