/usr/lib/simple-modules.scm is in scheme9 2013.11.26-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | ; Scheme 9 from Empty Space, Function Library
; By Nils M Holm, 2009,2012
; Placed in the Public Domain
;
; (module <name> <definition> ...) ==> unspecific
; (using <name> (<name_i> ...) <expression> ...) ==> object
;
; (load-from-library "simple-modules.scm")
;
; Simple modules. Inside of a MODULE expression, DEFINE defines
; a local object and DEFINE* defines a public object. <Name> names
; the module itself.
;
; Expressions inside of USING may use all <name_i>'s that are
; being imported from the module <name>.
;
; Example: (begin ; Note: BEGIN is only needed for automatic testing
; (module math
; (define* (fact x)
; (if (= 0 x) 1 (* x (fact (- x 1))))))
; (using math (fact)
; (fact 5))) ==> 120
(load-from-library "syntax-rules.scm")
(define-syntax module
(syntax-rules (define define*)
((_ (exports env))
(letrec env
(list . exports)))
((_ (exports env) (define (v . a*) . body) . defs)
(module (exports env)
(define v (lambda a* . body)) . defs))
((_ (exports env) (define v a) . defs)
(module (exports ((v a) . env)) . defs))
((_ (exports env) (define* (v . a*) . body) . defs)
(module (exports env)
(define* v (lambda a* . body)) . defs))
((_ (exports env) (define* v a) . defs)
(module (((cons 'v v) . exports) ((v a) . env)) . defs))
((_ name . defs)
(define name (module (() ()) . defs)))))
(define-syntax using
(syntax-rules ()
((_ (name env ()) . body)
(let env . body))
((_ (name env (import . rest)) . body)
(using (name ((import (cdr (assq 'import name))) . env)
rest) . body))
((_ name imports . body)
(using (name () imports) . body))))
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