Created
February 25, 2016 15:37
-
-
Save anlun/30d0a5c3f3ee28663490 to your computer and use it in GitHub Desktop.
A semantics with macros rules. Redex.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#lang racket | |
(require redex/reduction-semantics) | |
(require (for-syntax racket/match)) | |
(define-language L | |
(E ::= (list v ... E e ...) (car E) (cdr E) hole) | |
(v ::= (list v ...) natural) | |
(e ::= (list e ...) (car e) (cdr e) natural)) | |
(define-syntax-rule (==> a b) | |
(--> (in-hole E a) (in-hole E b))) | |
(define-syntax (reverse-me stx) | |
(datum->syntax stx (reverse (cdr (syntax->datum stx))))) | |
(define-syntax (reduction-relation-my stx) | |
(datum->syntax stx | |
(append | |
'(reduction-relation L) | |
(map (λ (x) | |
(match x | |
[`(==> ,from ,to) | |
`(--> (in-hole E ,from) (in-hole E ,to))] | |
[_ x])) | |
(cdr (syntax->datum stx)))))) | |
(define red | |
(reduction-relation-my | |
(==> (car (list v_1 v_2 ...)) v_1) | |
(==> (cdr (list v_1 v_2 ...)) (list v_2 ...)))) | |
(test-->> red | |
(term (list (car (cdr (cdr (cdr (list 0 1 2 3 4))))))) | |
(term (list 3))) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment