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root |
1.1 |
; Initialization file for TinySCHEME 1.41 |
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; Per R5RS, up to four deep compositions should be defined |
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root |
1.8 |
(define (caar x) ( car (car x))) |
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(define (cadr x) ( car (cdr x))) |
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(define (cdar x) ( cdr (car x))) |
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(define (cddr x) ( cdr (cdr x))) |
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(define (caaar x) ( car (car (car x)))) |
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(define (caadr x) ( car (car (cdr x)))) |
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(define (cadar x) ( car (cdr (car x)))) |
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(define (caddr x) ( car (cdr (cdr x)))) |
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(define (cdaar x) ( cdr (car (car x)))) |
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(define (cdadr x) ( cdr (car (cdr x)))) |
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(define (cddar x) ( cdr (cdr (car x)))) |
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(define (cdddr x) ( cdr (cdr (cdr x)))) |
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root |
1.1 |
(define (caaaar x) (car (car (car (car x))))) |
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(define (caaadr x) (car (car (car (cdr x))))) |
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(define (caadar x) (car (car (cdr (car x))))) |
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(define (caaddr x) (car (car (cdr (cdr x))))) |
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(define (cadaar x) (car (cdr (car (car x))))) |
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(define (cadadr x) (car (cdr (car (cdr x))))) |
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(define (caddar x) (car (cdr (cdr (car x))))) |
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(define (cadddr x) (car (cdr (cdr (cdr x))))) |
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(define (cdaaar x) (cdr (car (car (car x))))) |
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(define (cdaadr x) (cdr (car (car (cdr x))))) |
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(define (cdadar x) (cdr (car (cdr (car x))))) |
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(define (cdaddr x) (cdr (car (cdr (cdr x))))) |
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(define (cddaar x) (cdr (cdr (car (car x))))) |
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(define (cddadr x) (cdr (cdr (car (cdr x))))) |
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(define (cdddar x) (cdr (cdr (cdr (car x))))) |
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(define (cddddr x) (cdr (cdr (cdr (cdr x))))) |
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;;;; Utility to ease macro creation |
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(define (macro-expand form) |
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((eval (get-closure-code (eval (car form)))) form)) |
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(define (macro-expand-all form) |
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(if (macro? form) |
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(macro-expand-all (macro-expand form)) |
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form)) |
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(define *compile-hook* macro-expand-all) |
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(macro (unless form) |
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`(if (not ,(cadr form)) (begin ,@(cddr form)))) |
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(macro (when form) |
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`(if ,(cadr form) (begin ,@(cddr form)))) |
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; DEFINE-MACRO Contributed by Andy Gaynor |
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(macro (define-macro dform) |
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(if (symbol? (cadr dform)) |
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`(macro ,@(cdr dform)) |
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(let ((form (gensym))) |
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`(macro (,(caadr dform) ,form) |
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(apply (lambda ,(cdadr dform) ,@(cddr dform)) (cdr ,form)))))) |
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; Utilities for math. Notice that inexact->exact is primitive, |
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; but exact->inexact is not. |
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(define exact? integer?) |
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(define (inexact? x) (and (real? x) (not (integer? x)))) |
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(define (even? n) (= (remainder n 2) 0)) |
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(define (odd? n) (not (= (remainder n 2) 0))) |
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(define (zero? n) (= n 0)) |
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(define (positive? n) (> n 0)) |
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(define (negative? n) (< n 0)) |
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(define complex? number?) |
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(define rational? real?) |
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(define (abs n) (if (>= n 0) n (- n))) |
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(define (exact->inexact n) (* n 1.0)) |
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(define (<> n1 n2) (not (= n1 n2))) |
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; min and max must return inexact if any arg is inexact; use (+ n 0.0) |
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(define (max . lst) |
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(foldr (lambda (a b) |
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(if (> a b) |
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(if (exact? b) a (+ a 0.0)) |
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(if (exact? a) b (+ b 0.0)))) |
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(car lst) (cdr lst))) |
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(define (min . lst) |
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(foldr (lambda (a b) |
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(if (< a b) |
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(if (exact? b) a (+ a 0.0)) |
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(if (exact? a) b (+ b 0.0)))) |
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(car lst) (cdr lst))) |
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(define (succ x) (+ x 1)) |
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(define (pred x) (- x 1)) |
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(define gcd |
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(lambda a |
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(if (null? a) |
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0 |
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(let ((aa (abs (car a))) |
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(bb (abs (cadr a)))) |
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(if (= bb 0) |
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aa |
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(gcd bb (remainder aa bb))))))) |
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(define lcm |
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(lambda a |
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(if (null? a) |
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1 |
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(let ((aa (abs (car a))) |
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(bb (abs (cadr a)))) |
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(if (or (= aa 0) (= bb 0)) |
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0 |
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(abs (* (quotient aa (gcd aa bb)) bb))))))) |
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(define (string . charlist) |
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(list->string charlist)) |
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(define (list->string charlist) |
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(let* ((len (length charlist)) |
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(newstr (make-string len)) |
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(fill-string! |
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(lambda (str i len charlist) |
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(if (= i len) |
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str |
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(begin (string-set! str i (car charlist)) |
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(fill-string! str (+ i 1) len (cdr charlist))))))) |
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(fill-string! newstr 0 len charlist))) |
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(define (string-fill! s e) |
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(let ((n (string-length s))) |
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(let loop ((i 0)) |
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(if (= i n) |
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s |
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(begin (string-set! s i e) (loop (succ i))))))) |
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(define (string->list s) |
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(let loop ((n (pred (string-length s))) (l '())) |
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(if (= n -1) |
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l |
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(loop (pred n) (cons (string-ref s n) l))))) |
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(define (string-copy str) |
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(string-append str)) |
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(define (string->anyatom str pred) |
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(let* ((a (string->atom str))) |
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(if (pred a) a |
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(error "string->xxx: not a xxx" a)))) |
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(define (string->number str . base) |
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(let ((n (string->atom str (if (null? base) 10 (car base))))) |
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(if (number? n) n #f))) |
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(define (anyatom->string n pred) |
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(if (pred n) |
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(atom->string n) |
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(error "xxx->string: not a xxx" n))) |
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(define (number->string n . base) |
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(atom->string n (if (null? base) 10 (car base)))) |
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(define (char-cmp? cmp a b) |
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(cmp (char->integer a) (char->integer b))) |
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(define (char-ci-cmp? cmp a b) |
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(cmp (char->integer (char-downcase a)) (char->integer (char-downcase b)))) |
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(define (char=? a b) (char-cmp? = a b)) |
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(define (char<? a b) (char-cmp? < a b)) |
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(define (char>? a b) (char-cmp? > a b)) |
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(define (char<=? a b) (char-cmp? <= a b)) |
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(define (char>=? a b) (char-cmp? >= a b)) |
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(define (char-ci=? a b) (char-ci-cmp? = a b)) |
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(define (char-ci<? a b) (char-ci-cmp? < a b)) |
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(define (char-ci>? a b) (char-ci-cmp? > a b)) |
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(define (char-ci<=? a b) (char-ci-cmp? <= a b)) |
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(define (char-ci>=? a b) (char-ci-cmp? >= a b)) |
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; Note the trick of returning (cmp x y) |
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(define (string-cmp? chcmp cmp a b) |
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(let ((na (string-length a)) (nb (string-length b))) |
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(let loop ((i 0)) |
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(cond |
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((= i na) |
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(if (= i nb) (cmp 0 0) (cmp 0 1))) |
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((= i nb) |
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(cmp 1 0)) |
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((chcmp = (string-ref a i) (string-ref b i)) |
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(loop (succ i))) |
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(else |
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(chcmp cmp (string-ref a i) (string-ref b i))))))) |
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(define (string=? a b) (string-cmp? char-cmp? = a b)) |
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(define (string<? a b) (string-cmp? char-cmp? < a b)) |
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(define (string>? a b) (string-cmp? char-cmp? > a b)) |
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(define (string<=? a b) (string-cmp? char-cmp? <= a b)) |
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(define (string>=? a b) (string-cmp? char-cmp? >= a b)) |
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| 196 |
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(define (string-ci=? a b) (string-cmp? char-ci-cmp? = a b)) |
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(define (string-ci<? a b) (string-cmp? char-ci-cmp? < a b)) |
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(define (string-ci>? a b) (string-cmp? char-ci-cmp? > a b)) |
| 199 |
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(define (string-ci<=? a b) (string-cmp? char-ci-cmp? <= a b)) |
| 200 |
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(define (string-ci>=? a b) (string-cmp? char-ci-cmp? >= a b)) |
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| 202 |
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(define (list . x) x) |
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| 204 |
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(define (foldr f x lst) |
| 205 |
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(if (null? lst) |
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x |
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(foldr f (f x (car lst)) (cdr lst)))) |
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| 209 |
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(define (unzip1-with-cdr . lists) |
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(unzip1-with-cdr-iterative lists '() '())) |
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(define (unzip1-with-cdr-iterative lists cars cdrs) |
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(if (null? lists) |
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(cons cars cdrs) |
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(let ((car1 (caar lists)) |
| 216 |
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(cdr1 (cdar lists))) |
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(unzip1-with-cdr-iterative |
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(cdr lists) |
| 219 |
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(append cars (list car1)) |
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(append cdrs (list cdr1)))))) |
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(define (map proc . lists) |
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(if (null? lists) |
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(apply proc) |
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(if (null? (car lists)) |
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'() |
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(let* ((unz (apply unzip1-with-cdr lists)) |
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(cars (car unz)) |
| 229 |
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(cdrs (cdr unz))) |
| 230 |
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(cons (apply proc cars) (apply map (cons proc cdrs))))))) |
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| 232 |
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(define (for-each proc . lists) |
| 233 |
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(if (null? lists) |
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(apply proc) |
| 235 |
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(if (null? (car lists)) |
| 236 |
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#t |
| 237 |
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(let* ((unz (apply unzip1-with-cdr lists)) |
| 238 |
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(cars (car unz)) |
| 239 |
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(cdrs (cdr unz))) |
| 240 |
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(apply proc cars) (apply map (cons proc cdrs)))))) |
| 241 |
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| 242 |
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(define (list-tail x k) |
| 243 |
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(if (zero? k) |
| 244 |
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x |
| 245 |
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(list-tail (cdr x) (- k 1)))) |
| 246 |
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| 247 |
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(define (list-ref x k) |
| 248 |
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(car (list-tail x k))) |
| 249 |
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| 250 |
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(define (last-pair x) |
| 251 |
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(if (pair? (cdr x)) |
| 252 |
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(last-pair (cdr x)) |
| 253 |
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x)) |
| 254 |
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| 255 |
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(define (head stream) (car stream)) |
| 256 |
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| 257 |
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(define (tail stream) (force (cdr stream))) |
| 258 |
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| 259 |
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(define (vector-equal? x y) |
| 260 |
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(and (vector? x) (vector? y) (= (vector-length x) (vector-length y)) |
| 261 |
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(let ((n (vector-length x))) |
| 262 |
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(let loop ((i 0)) |
| 263 |
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(if (= i n) |
| 264 |
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#t |
| 265 |
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(and (equal? (vector-ref x i) (vector-ref y i)) |
| 266 |
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(loop (succ i)))))))) |
| 267 |
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| 268 |
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(define (list->vector x) |
| 269 |
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(apply vector x)) |
| 270 |
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| 271 |
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(define (vector-fill! v e) |
| 272 |
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(let ((n (vector-length v))) |
| 273 |
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(let loop ((i 0)) |
| 274 |
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(if (= i n) |
| 275 |
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v |
| 276 |
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(begin (vector-set! v i e) (loop (succ i))))))) |
| 277 |
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| 278 |
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(define (vector->list v) |
| 279 |
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(let loop ((n (pred (vector-length v))) (l '())) |
| 280 |
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(if (= n -1) |
| 281 |
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l |
| 282 |
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(loop (pred n) (cons (vector-ref v n) l))))) |
| 283 |
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| 284 |
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;; The following quasiquote macro is due to Eric S. Tiedemann. |
| 285 |
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;; Copyright 1988 by Eric S. Tiedemann; all rights reserved. |
| 286 |
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;; |
| 287 |
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;; Subsequently modified to handle vectors: D. Souflis |
| 288 |
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| 289 |
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(macro |
| 290 |
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quasiquote |
| 291 |
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(lambda (l) |
| 292 |
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(define (mcons f l r) |
| 293 |
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(if (and (pair? r) |
| 294 |
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(eq? (car r) 'quote) |
| 295 |
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(eq? (car (cdr r)) (cdr f)) |
| 296 |
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(pair? l) |
| 297 |
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(eq? (car l) 'quote) |
| 298 |
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(eq? (car (cdr l)) (car f))) |
| 299 |
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(if (or (procedure? f) (number? f) (string? f)) |
| 300 |
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f |
| 301 |
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(list 'quote f)) |
| 302 |
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(if (eqv? l vector) |
| 303 |
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(apply l (eval r)) |
| 304 |
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(list 'cons l r) |
| 305 |
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))) |
| 306 |
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(define (mappend f l r) |
| 307 |
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(if (or (null? (cdr f)) |
| 308 |
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(and (pair? r) |
| 309 |
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(eq? (car r) 'quote) |
| 310 |
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(eq? (car (cdr r)) '()))) |
| 311 |
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l |
| 312 |
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(list 'append l r))) |
| 313 |
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(define (foo level form) |
| 314 |
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(cond ((not (pair? form)) |
| 315 |
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(if (or (procedure? form) (number? form) (string? form)) |
| 316 |
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form |
| 317 |
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(list 'quote form)) |
| 318 |
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) |
| 319 |
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((eq? 'quasiquote (car form)) |
| 320 |
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(mcons form ''quasiquote (foo (+ level 1) (cdr form)))) |
| 321 |
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(#t (if (zero? level) |
| 322 |
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(cond ((eq? (car form) 'unquote) (car (cdr form))) |
| 323 |
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((eq? (car form) 'unquote-splicing) |
| 324 |
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(error "Unquote-splicing wasn't in a list:" |
| 325 |
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form)) |
| 326 |
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((and (pair? (car form)) |
| 327 |
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(eq? (car (car form)) 'unquote-splicing)) |
| 328 |
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(mappend form (car (cdr (car form))) |
| 329 |
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(foo level (cdr form)))) |
| 330 |
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(#t (mcons form (foo level (car form)) |
| 331 |
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(foo level (cdr form))))) |
| 332 |
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(cond ((eq? (car form) 'unquote) |
| 333 |
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(mcons form ''unquote (foo (- level 1) |
| 334 |
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(cdr form)))) |
| 335 |
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((eq? (car form) 'unquote-splicing) |
| 336 |
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(mcons form ''unquote-splicing |
| 337 |
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(foo (- level 1) (cdr form)))) |
| 338 |
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(#t (mcons form (foo level (car form)) |
| 339 |
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(foo level (cdr form))))))))) |
| 340 |
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|
(foo 0 (car (cdr l))))) |
| 341 |
|
|
|
| 342 |
|
|
;;;;;Helper for the dynamic-wind definition. By Tom Breton (Tehom) |
| 343 |
|
|
(define (shared-tail x y) |
| 344 |
|
|
(let ((len-x (length x)) |
| 345 |
|
|
(len-y (length y))) |
| 346 |
|
|
(define (shared-tail-helper x y) |
| 347 |
|
|
(if |
| 348 |
|
|
(eq? x y) |
| 349 |
|
|
x |
| 350 |
|
|
(shared-tail-helper (cdr x) (cdr y)))) |
| 351 |
|
|
|
| 352 |
|
|
(cond |
| 353 |
|
|
((> len-x len-y) |
| 354 |
|
|
(shared-tail-helper |
| 355 |
|
|
(list-tail x (- len-x len-y)) |
| 356 |
|
|
y)) |
| 357 |
|
|
((< len-x len-y) |
| 358 |
|
|
(shared-tail-helper |
| 359 |
|
|
x |
| 360 |
|
|
(list-tail y (- len-y len-x)))) |
| 361 |
|
|
(#t (shared-tail-helper x y))))) |
| 362 |
|
|
|
| 363 |
|
|
;;;;;Dynamic-wind by Tom Breton (Tehom) |
| 364 |
|
|
|
| 365 |
|
|
;;Guarded because we must only eval this once, because doing so |
| 366 |
|
|
;;redefines call/cc in terms of old call/cc |
| 367 |
|
|
(unless (defined? 'dynamic-wind) |
| 368 |
|
|
(let |
| 369 |
|
|
;;These functions are defined in the context of a private list of |
| 370 |
|
|
;;pairs of before/after procs. |
| 371 |
|
|
( (*active-windings* '()) |
| 372 |
|
|
;;We'll define some functions into the larger environment, so |
| 373 |
|
|
;;we need to know it. |
| 374 |
|
|
(outer-env (current-environment))) |
| 375 |
|
|
|
| 376 |
|
|
;;Poor-man's structure operations |
| 377 |
|
|
(define before-func car) |
| 378 |
|
|
(define after-func cdr) |
| 379 |
|
|
(define make-winding cons) |
| 380 |
|
|
|
| 381 |
|
|
;;Manage active windings |
| 382 |
|
|
(define (activate-winding! new) |
| 383 |
|
|
((before-func new)) |
| 384 |
|
|
(set! *active-windings* (cons new *active-windings*))) |
| 385 |
|
|
(define (deactivate-top-winding!) |
| 386 |
|
|
(let ((old-top (car *active-windings*))) |
| 387 |
|
|
;;Remove it from the list first so it's not active during its |
| 388 |
|
|
;;own exit. |
| 389 |
|
|
(set! *active-windings* (cdr *active-windings*)) |
| 390 |
|
|
((after-func old-top)))) |
| 391 |
|
|
|
| 392 |
|
|
(define (set-active-windings! new-ws) |
| 393 |
|
|
(unless (eq? new-ws *active-windings*) |
| 394 |
|
|
(let ((shared (shared-tail new-ws *active-windings*))) |
| 395 |
|
|
|
| 396 |
|
|
;;Define the looping functions. |
| 397 |
|
|
;;Exit the old list. Do deeper ones last. Don't do |
| 398 |
|
|
;;any shared ones. |
| 399 |
|
|
(define (pop-many) |
| 400 |
|
|
(unless (eq? *active-windings* shared) |
| 401 |
|
|
(deactivate-top-winding!) |
| 402 |
|
|
(pop-many))) |
| 403 |
|
|
;;Enter the new list. Do deeper ones first so that the |
| 404 |
|
|
;;deeper windings will already be active. Don't do any |
| 405 |
|
|
;;shared ones. |
| 406 |
|
|
(define (push-many new-ws) |
| 407 |
|
|
(unless (eq? new-ws shared) |
| 408 |
|
|
(push-many (cdr new-ws)) |
| 409 |
|
|
(activate-winding! (car new-ws)))) |
| 410 |
|
|
|
| 411 |
|
|
;;Do it. |
| 412 |
|
|
(pop-many) |
| 413 |
|
|
(push-many new-ws)))) |
| 414 |
|
|
|
| 415 |
|
|
;;The definitions themselves. |
| 416 |
|
|
(eval |
| 417 |
|
|
`(define call-with-current-continuation |
| 418 |
|
|
;;It internally uses the built-in call/cc, so capture it. |
| 419 |
|
|
,(let ((old-c/cc call-with-current-continuation)) |
| 420 |
|
|
(lambda (func) |
| 421 |
|
|
;;Use old call/cc to get the continuation. |
| 422 |
|
|
(old-c/cc |
| 423 |
|
|
(lambda (continuation) |
| 424 |
|
|
;;Call func with not the continuation itself |
| 425 |
|
|
;;but a procedure that adjusts the active |
| 426 |
|
|
;;windings to what they were when we made |
| 427 |
|
|
;;this, and only then calls the |
| 428 |
|
|
;;continuation. |
| 429 |
|
|
(func |
| 430 |
|
|
(let ((current-ws *active-windings*)) |
| 431 |
|
|
(lambda (x) |
| 432 |
|
|
(set-active-windings! current-ws) |
| 433 |
|
|
(continuation x))))))))) |
| 434 |
|
|
outer-env) |
| 435 |
|
|
;;We can't just say "define (dynamic-wind before thunk after)" |
| 436 |
|
|
;;because the lambda it's defined to lives in this environment, |
| 437 |
|
|
;;not in the global environment. |
| 438 |
|
|
(eval |
| 439 |
|
|
`(define dynamic-wind |
| 440 |
|
|
,(lambda (before thunk after) |
| 441 |
|
|
;;Make a new winding |
| 442 |
|
|
(activate-winding! (make-winding before after)) |
| 443 |
|
|
(let ((result (thunk))) |
| 444 |
|
|
;;Get rid of the new winding. |
| 445 |
|
|
(deactivate-top-winding!) |
| 446 |
|
|
;;The return value is that of thunk. |
| 447 |
|
|
result))) |
| 448 |
|
|
outer-env))) |
| 449 |
|
|
|
| 450 |
|
|
(define call/cc call-with-current-continuation) |
| 451 |
|
|
|
| 452 |
|
|
|
| 453 |
|
|
;;;;; atom? and equal? written by a.k |
| 454 |
|
|
|
| 455 |
|
|
;;;; atom? |
| 456 |
|
|
(define (atom? x) |
| 457 |
|
|
(not (pair? x))) |
| 458 |
|
|
|
| 459 |
|
|
;;;; equal? |
| 460 |
|
|
(define (equal? x y) |
| 461 |
|
|
(cond |
| 462 |
|
|
((pair? x) |
| 463 |
|
|
(and (pair? y) |
| 464 |
|
|
(equal? (car x) (car y)) |
| 465 |
|
|
(equal? (cdr x) (cdr y)))) |
| 466 |
|
|
((vector? x) |
| 467 |
|
|
(and (vector? y) (vector-equal? x y))) |
| 468 |
|
|
((string? x) |
| 469 |
|
|
(and (string? y) (string=? x y))) |
| 470 |
|
|
(else (eqv? x y)))) |
| 471 |
|
|
|
| 472 |
|
|
;;;; (do ((var init inc) ...) (endtest result ...) body ...) |
| 473 |
|
|
;; |
| 474 |
|
|
(macro do |
| 475 |
|
|
(lambda (do-macro) |
| 476 |
|
|
(apply (lambda (do vars endtest . body) |
| 477 |
|
|
(let ((do-loop (gensym))) |
| 478 |
|
|
`(letrec ((,do-loop |
| 479 |
|
|
(lambda ,(map (lambda (x) |
| 480 |
|
|
(if (pair? x) (car x) x)) |
| 481 |
|
|
`,vars) |
| 482 |
|
|
(if ,(car endtest) |
| 483 |
|
|
(begin ,@(cdr endtest)) |
| 484 |
|
|
(begin |
| 485 |
|
|
,@body |
| 486 |
|
|
(,do-loop |
| 487 |
|
|
,@(map (lambda (x) |
| 488 |
|
|
(cond |
| 489 |
|
|
((not (pair? x)) x) |
| 490 |
|
|
((< (length x) 3) (car x)) |
| 491 |
|
|
(else (car (cdr (cdr x)))))) |
| 492 |
|
|
`,vars))))))) |
| 493 |
|
|
(,do-loop |
| 494 |
|
|
,@(map (lambda (x) |
| 495 |
|
|
(if (and (pair? x) (cdr x)) |
| 496 |
|
|
(car (cdr x)) |
| 497 |
|
|
'())) |
| 498 |
|
|
`,vars))))) |
| 499 |
|
|
do-macro))) |
| 500 |
|
|
|
| 501 |
|
|
;;;; generic-member |
| 502 |
|
|
(define (generic-member cmp obj lst) |
| 503 |
|
|
(cond |
| 504 |
|
|
((null? lst) #f) |
| 505 |
|
|
((cmp obj (car lst)) lst) |
| 506 |
|
|
(else (generic-member cmp obj (cdr lst))))) |
| 507 |
|
|
|
| 508 |
|
|
(define (memq obj lst) |
| 509 |
|
|
(generic-member eq? obj lst)) |
| 510 |
|
|
(define (memv obj lst) |
| 511 |
|
|
(generic-member eqv? obj lst)) |
| 512 |
|
|
(define (member obj lst) |
| 513 |
|
|
(generic-member equal? obj lst)) |
| 514 |
|
|
|
| 515 |
|
|
;;;; generic-assoc |
| 516 |
|
|
(define (generic-assoc cmp obj alst) |
| 517 |
|
|
(cond |
| 518 |
|
|
((null? alst) #f) |
| 519 |
|
|
((cmp obj (caar alst)) (car alst)) |
| 520 |
|
|
(else (generic-assoc cmp obj (cdr alst))))) |
| 521 |
|
|
|
| 522 |
|
|
(define (assq obj alst) |
| 523 |
|
|
(generic-assoc eq? obj alst)) |
| 524 |
|
|
(define (assv obj alst) |
| 525 |
|
|
(generic-assoc eqv? obj alst)) |
| 526 |
|
|
(define (assoc obj alst) |
| 527 |
|
|
(generic-assoc equal? obj alst)) |
| 528 |
|
|
|
| 529 |
|
|
(define (acons x y z) (cons (cons x y) z)) |
| 530 |
|
|
|
| 531 |
|
|
;;;; Handy for imperative programs |
| 532 |
|
|
;;;; Used as: (define-with-return (foo x y) .... (return z) ...) |
| 533 |
|
|
(macro (define-with-return form) |
| 534 |
|
|
`(define ,(cadr form) |
| 535 |
|
|
(call/cc (lambda (return) ,@(cddr form))))) |
| 536 |
|
|
|
| 537 |
|
|
;;;; Simple exception handling |
| 538 |
|
|
; |
| 539 |
|
|
; Exceptions are caught as follows: |
| 540 |
|
|
; |
| 541 |
|
|
; (catch (do-something to-recover and-return meaningful-value) |
| 542 |
|
|
; (if-something goes-wrong) |
| 543 |
|
|
; (with-these calls)) |
| 544 |
|
|
; |
| 545 |
|
|
; "Catch" establishes a scope spanning multiple call-frames |
| 546 |
|
|
; until another "catch" is encountered. |
| 547 |
|
|
; |
| 548 |
|
|
; Exceptions are thrown with: |
| 549 |
|
|
; |
| 550 |
|
|
; (throw "message") |
| 551 |
|
|
; |
| 552 |
|
|
; If used outside a (catch ...), reverts to (error "message) |
| 553 |
|
|
|
| 554 |
|
|
(define *handlers* (list)) |
| 555 |
|
|
|
| 556 |
|
|
(define (push-handler proc) |
| 557 |
|
|
(set! *handlers* (cons proc *handlers*))) |
| 558 |
|
|
|
| 559 |
|
|
(define (pop-handler) |
| 560 |
|
|
(let ((h (car *handlers*))) |
| 561 |
|
|
(set! *handlers* (cdr *handlers*)) |
| 562 |
|
|
h)) |
| 563 |
|
|
|
| 564 |
|
|
(define (more-handlers?) |
| 565 |
|
|
(pair? *handlers*)) |
| 566 |
|
|
|
| 567 |
|
|
(define (throw . x) |
| 568 |
|
|
(if (more-handlers?) |
| 569 |
|
|
(apply (pop-handler)) |
| 570 |
|
|
(apply error x))) |
| 571 |
|
|
|
| 572 |
|
|
(macro (catch form) |
| 573 |
|
|
(let ((label (gensym))) |
| 574 |
|
|
`(call/cc (lambda (exit) |
| 575 |
|
|
(push-handler (lambda () (exit ,(cadr form)))) |
| 576 |
|
|
(let ((,label (begin ,@(cddr form)))) |
| 577 |
|
|
(pop-handler) |
| 578 |
|
|
,label))))) |
| 579 |
|
|
|
| 580 |
|
|
(define *error-hook* throw) |
| 581 |
|
|
|
| 582 |
|
|
|
| 583 |
|
|
;;;;; Definition of MAKE-ENVIRONMENT, to be used with two-argument EVAL |
| 584 |
|
|
|
| 585 |
|
|
(macro (make-environment form) |
| 586 |
|
|
`(apply (lambda () |
| 587 |
|
|
,@(cdr form) |
| 588 |
|
|
(current-environment)))) |
| 589 |
|
|
|
| 590 |
|
|
(define-macro (eval-polymorphic x . envl) |
| 591 |
|
|
(display envl) |
| 592 |
|
|
(let* ((env (if (null? envl) (current-environment) (eval (car envl)))) |
| 593 |
|
|
(xval (eval x env))) |
| 594 |
|
|
(if (closure? xval) |
| 595 |
|
|
(make-closure (get-closure-code xval) env) |
| 596 |
|
|
xval))) |
| 597 |
|
|
|
| 598 |
|
|
; Redefine this if you install another package infrastructure |
| 599 |
|
|
; Also redefine 'package' |
| 600 |
|
|
(define *colon-hook* eval) |
| 601 |
|
|
|
| 602 |
|
|
;;;;; I/O |
| 603 |
|
|
|
| 604 |
|
|
(define (input-output-port? p) |
| 605 |
|
|
(and (input-port? p) (output-port? p))) |
| 606 |
|
|
|
| 607 |
|
|
(define (close-port p) |
| 608 |
|
|
(cond |
| 609 |
|
|
((input-output-port? p) (close-input-port (close-output-port p))) |
| 610 |
|
|
((input-port? p) (close-input-port p)) |
| 611 |
|
|
((output-port? p) (close-output-port p)) |
| 612 |
|
|
(else (throw "Not a port" p)))) |
| 613 |
|
|
|
| 614 |
|
|
(define (call-with-input-file s p) |
| 615 |
|
|
(let ((inport (open-input-file s))) |
| 616 |
|
|
(if (eq? inport #f) |
| 617 |
|
|
#f |
| 618 |
|
|
(let ((res (p inport))) |
| 619 |
|
|
(close-input-port inport) |
| 620 |
|
|
res)))) |
| 621 |
|
|
|
| 622 |
|
|
(define (call-with-output-file s p) |
| 623 |
|
|
(let ((outport (open-output-file s))) |
| 624 |
|
|
(if (eq? outport #f) |
| 625 |
|
|
#f |
| 626 |
|
|
(let ((res (p outport))) |
| 627 |
|
|
(close-output-port outport) |
| 628 |
|
|
res)))) |
| 629 |
|
|
|
| 630 |
|
|
(define (with-input-from-file s p) |
| 631 |
|
|
(let ((inport (open-input-file s))) |
| 632 |
|
|
(if (eq? inport #f) |
| 633 |
|
|
#f |
| 634 |
|
|
(let ((prev-inport (current-input-port))) |
| 635 |
|
|
(set-input-port inport) |
| 636 |
|
|
(let ((res (p))) |
| 637 |
|
|
(close-input-port inport) |
| 638 |
|
|
(set-input-port prev-inport) |
| 639 |
|
|
res))))) |
| 640 |
|
|
|
| 641 |
|
|
(define (with-output-to-file s p) |
| 642 |
|
|
(let ((outport (open-output-file s))) |
| 643 |
|
|
(if (eq? outport #f) |
| 644 |
|
|
#f |
| 645 |
|
|
(let ((prev-outport (current-output-port))) |
| 646 |
|
|
(set-output-port outport) |
| 647 |
|
|
(let ((res (p))) |
| 648 |
|
|
(close-output-port outport) |
| 649 |
|
|
(set-output-port prev-outport) |
| 650 |
|
|
res))))) |
| 651 |
|
|
|
| 652 |
|
|
(define (with-input-output-from-to-files si so p) |
| 653 |
|
|
(let ((inport (open-input-file si)) |
| 654 |
|
|
(outport (open-input-file so))) |
| 655 |
|
|
(if (not (and inport outport)) |
| 656 |
|
|
(begin |
| 657 |
|
|
(close-input-port inport) |
| 658 |
|
|
(close-output-port outport) |
| 659 |
|
|
#f) |
| 660 |
|
|
(let ((prev-inport (current-input-port)) |
| 661 |
|
|
(prev-outport (current-output-port))) |
| 662 |
|
|
(set-input-port inport) |
| 663 |
|
|
(set-output-port outport) |
| 664 |
|
|
(let ((res (p))) |
| 665 |
|
|
(close-input-port inport) |
| 666 |
|
|
(close-output-port outport) |
| 667 |
|
|
(set-input-port prev-inport) |
| 668 |
|
|
(set-output-port prev-outport) |
| 669 |
|
|
res))))) |
| 670 |
|
|
|
| 671 |
|
|
; Random number generator (maximum cycle) |
| 672 |
|
|
(define *seed* 1) |
| 673 |
|
|
(define (random-next) |
| 674 |
|
|
(let* ((a 16807) (m 2147483647) (q (quotient m a)) (r (modulo m a))) |
| 675 |
|
|
(set! *seed* |
| 676 |
|
|
(- (* a (- *seed* |
| 677 |
|
|
(* (quotient *seed* q) q))) |
| 678 |
|
|
(* (quotient *seed* q) r))) |
| 679 |
|
|
(if (< *seed* 0) (set! *seed* (+ *seed* m))) |
| 680 |
|
|
*seed*)) |
| 681 |
root |
1.3 |
|
| 682 |
root |
1.1 |
;; SRFI-0 |
| 683 |
|
|
;; COND-EXPAND |
| 684 |
|
|
;; Implemented as a macro |
| 685 |
|
|
(define *features* '(srfi-0)) |
| 686 |
|
|
|
| 687 |
|
|
(define-macro (cond-expand . cond-action-list) |
| 688 |
|
|
(cond-expand-runtime cond-action-list)) |
| 689 |
|
|
|
| 690 |
|
|
(define (cond-expand-runtime cond-action-list) |
| 691 |
|
|
(if (null? cond-action-list) |
| 692 |
|
|
#t |
| 693 |
|
|
(if (cond-eval (caar cond-action-list)) |
| 694 |
|
|
`(begin ,@(cdar cond-action-list)) |
| 695 |
|
|
(cond-expand-runtime (cdr cond-action-list))))) |
| 696 |
|
|
|
| 697 |
|
|
(define (cond-eval-and cond-list) |
| 698 |
|
|
(foldr (lambda (x y) (and (cond-eval x) (cond-eval y))) #t cond-list)) |
| 699 |
|
|
|
| 700 |
|
|
(define (cond-eval-or cond-list) |
| 701 |
|
|
(foldr (lambda (x y) (or (cond-eval x) (cond-eval y))) #f cond-list)) |
| 702 |
|
|
|
| 703 |
|
|
(define (cond-eval condition) |
| 704 |
|
|
(cond |
| 705 |
|
|
((symbol? condition) |
| 706 |
|
|
(if (member condition *features*) #t #f)) |
| 707 |
|
|
((eq? condition #t) #t) |
| 708 |
|
|
((eq? condition #f) #f) |
| 709 |
|
|
(else (case (car condition) |
| 710 |
|
|
((and) (cond-eval-and (cdr condition))) |
| 711 |
|
|
((or) (cond-eval-or (cdr condition))) |
| 712 |
|
|
((not) (if (not (null? (cddr condition))) |
| 713 |
|
|
(error "cond-expand : 'not' takes 1 argument") |
| 714 |
|
|
(not (cond-eval (cadr condition))))) |
| 715 |
|
|
(else (error "cond-expand : unknown operator" (car condition))))))) |
| 716 |
|
|
|
| 717 |
|
|
(gc-verbose #f) |
| 718 |
root |
1.2 |
|
| 719 |
root |
1.7 |
; compatibility functions added by schmorp@schmorp.de |
| 720 |
|
|
(macro (defmacro dform) |
| 721 |
|
|
(let ((name (cadr dform)) (formals (caddr dform)) (body (cdddr dform))) |
| 722 |
|
|
`(define-macro (,name . ,formals) ,@body))) |
| 723 |
|
|
|
| 724 |
root |
1.8 |
;; r7rs |
| 725 |
|
|
; char library |
| 726 |
|
|
; string-upcase |
| 727 |
|
|
; string-downcase |
| 728 |
|
|
; string-foldcase |
| 729 |
|
|
; sring-map, vector-map, string-for-each, vector-for-each |
| 730 |
|
|
; bytevectors |
| 731 |
|
|
|
| 732 |
root |
1.5 |
;; srfi-1 |
| 733 |
|
|
|
| 734 |
|
|
(define (check-arg pred val caller) |
| 735 |
|
|
(let lp ((val val)) |
| 736 |
|
|
(if (pred val) val (lp (error "Bad argument" val pred caller))))) |
| 737 |
|
|
|
| 738 |
root |
1.10 |
;(load "srfi-55.scm") |
| 739 |
|
|
|
| 740 |
|
|
;(register-extension '(srfi 1) (lamba () (load "srfi-1.scm"))) |
| 741 |
|
|
;(register-extension '(srfi 23) (lamba () ())) ; error builtin |
| 742 |
|
|
;(register-extension '(srfi 55) (lamba () ())) ; always available |
| 743 |
|
|
|
| 744 |
|
|
(load "srfi-1.scm") |
| 745 |
root |
1.5 |
|
| 746 |
|
|
;; end of init |
| 747 |
|
|
|
| 748 |
root |
1.9 |
(load "test.scm") |
| 749 |
root |
1.5 |
|
