picrin/contrib/20.r7rs/scheme/eval.scm

20 lines
465 B
Scheme

(define-library (scheme eval)
(import (picrin base))
(define counter 0)
(define-syntax (inc! n)
#`(set! #,n (+ #,n 1)))
(define (number->symbol n)
(string->symbol (number->string n)))
(define (environment . specs)
(let ((library-name `(picrin @@my-environment ,(number->symbol counter))))
(inc! counter)
(let ((lib (make-library library-name)))
(eval `(import ,@specs) lib)
lib)))
(export environment eval))