| 1 |
; Initialization file for TinySCHEME 1.41 |
| 2 |
|
| 3 |
(gc-verbose #t) |
| 4 |
|
| 5 |
;;;; Utility to ease macro creation |
| 6 |
(define (macro-expand form) |
| 7 |
((eval (get-closure-code (eval (car form)))) form)) |
| 8 |
|
| 9 |
(define (macro-expand-all form) |
| 10 |
(if (macro? form) |
| 11 |
(macro-expand-all (macro-expand form)) |
| 12 |
form)) |
| 13 |
|
| 14 |
(define *compile-hook* macro-expand-all) |
| 15 |
|
| 16 |
|
| 17 |
(macro (unless form) |
| 18 |
`(if (not ,(cadr form)) (begin ,@(cddr form)))) |
| 19 |
|
| 20 |
(macro (when form) |
| 21 |
`(if ,(cadr form) (begin ,@(cddr form)))) |
| 22 |
|
| 23 |
; DEFINE-MACRO Contributed by Andy Gaynor |
| 24 |
(macro (define-macro dform) |
| 25 |
(if (symbol? (cadr dform)) |
| 26 |
`(macro ,@(cdr dform)) |
| 27 |
(let ((form (gensym))) |
| 28 |
`(macro (,(caadr dform) ,form) |
| 29 |
(apply (lambda ,(cdadr dform) ,@(cddr dform)) (cdr ,form)))))) |
| 30 |
|
| 31 |
; Utilities for math. Notice that inexact->exact is primitive, |
| 32 |
; but exact->inexact is not. |
| 33 |
(define exact? integer?) |
| 34 |
(define exact-integer? integer?) |
| 35 |
(define (inexact? x) (and (real? x) (not (integer? x)))) |
| 36 |
(define (exact->inexact n) (* n 1.0)) |
| 37 |
(define exact inexact->exact) |
| 38 |
(define inexact exact->inexact) |
| 39 |
(define (even? n) (= (remainder n 2) 0)) |
| 40 |
(define (odd? n) (not (= (remainder n 2) 0))) |
| 41 |
(define (zero? n) (= n 0)) |
| 42 |
(define (positive? n) (> n 0)) |
| 43 |
(define (negative? n) (< n 0)) |
| 44 |
(define complex? number?) |
| 45 |
(define rational? real?) |
| 46 |
(define (abs n) (if (>= n 0) n (- n))) |
| 47 |
(define (<> n1 n2) (not (= n1 n2))) |
| 48 |
(define (square n) (* n n)) |
| 49 |
;; missing: numerator denominator rationalize exact-integer-sqrt |
| 50 |
|
| 51 |
; min and max must return inexact if any arg is inexact |
| 52 |
(define (max . lst) |
| 53 |
(foldr (lambda (a b) |
| 54 |
(if (> a b) |
| 55 |
(if (exact? b) a (exact->inexact a)) |
| 56 |
(if (exact? a) b (exact->inexact b)))) |
| 57 |
(car lst) (cdr lst))) |
| 58 |
(define (min . lst) |
| 59 |
(foldr (lambda (a b) |
| 60 |
(if (< a b) |
| 61 |
(if (exact? b) a (exact->inexact a)) |
| 62 |
(if (exact? a) b (exact->inexact b)))) |
| 63 |
(car lst) (cdr lst))) |
| 64 |
|
| 65 |
(define (succ x) (+ x 1)) |
| 66 |
(define (pred x) (- x 1)) |
| 67 |
(define gcd |
| 68 |
(lambda a |
| 69 |
(if (null? a) |
| 70 |
0 |
| 71 |
(let ((aa (abs (car a))) |
| 72 |
(bb (abs (cadr a)))) |
| 73 |
(if (= bb 0) |
| 74 |
aa |
| 75 |
(gcd bb (remainder aa bb))))))) |
| 76 |
(define lcm |
| 77 |
(lambda a |
| 78 |
(if (null? a) |
| 79 |
1 |
| 80 |
(let ((aa (abs (car a))) |
| 81 |
(bb (abs (cadr a)))) |
| 82 |
(if (or (= aa 0) (= bb 0)) |
| 83 |
0 |
| 84 |
(abs (* (quotient aa (gcd aa bb)) bb))))))) |
| 85 |
|
| 86 |
|
| 87 |
(define (string . charlist) |
| 88 |
(list->string charlist)) |
| 89 |
|
| 90 |
(define (list->string charlist) |
| 91 |
(let* ((len (length charlist)) |
| 92 |
(newstr (make-string len)) |
| 93 |
(fill-string! |
| 94 |
(lambda (str i len charlist) |
| 95 |
(if (= i len) |
| 96 |
str |
| 97 |
(begin (string-set! str i (car charlist)) |
| 98 |
(fill-string! str (+ i 1) len (cdr charlist))))))) |
| 99 |
(fill-string! newstr 0 len charlist))) |
| 100 |
|
| 101 |
(define (string-fill! s e) |
| 102 |
(let ((n (string-length s))) |
| 103 |
(let loop ((i 0)) |
| 104 |
(if (= i n) |
| 105 |
s |
| 106 |
(begin (string-set! s i e) (loop (succ i))))))) |
| 107 |
|
| 108 |
(define (string->list s) |
| 109 |
(let loop ((n (pred (string-length s))) (l '())) |
| 110 |
(if (= n -1) |
| 111 |
l |
| 112 |
(loop (pred n) (cons (string-ref s n) l))))) |
| 113 |
|
| 114 |
;TODO string-upcase |
| 115 |
;TODO string-downcase |
| 116 |
;TODO string-foldcase |
| 117 |
;TODO string-copy! |
| 118 |
;TODO string-fill! |
| 119 |
|
| 120 |
(define substring string-copy) |
| 121 |
|
| 122 |
(define (string->anyatom str pred) |
| 123 |
(let* ((a (string->atom str))) |
| 124 |
(if (pred a) a |
| 125 |
(error "string->xxx: not a xxx" a)))) |
| 126 |
|
| 127 |
(define (string->number str . base) |
| 128 |
(let ((n (string->atom str (if (null? base) 10 (car base))))) |
| 129 |
(if (number? n) n #f))) |
| 130 |
|
| 131 |
(define (anyatom->string n pred) |
| 132 |
(if (pred n) |
| 133 |
(atom->string n) |
| 134 |
(error "xxx->string: not a xxx" n))) |
| 135 |
|
| 136 |
(define (number->string n . base) |
| 137 |
(atom->string n (if (null? base) 10 (car base)))) |
| 138 |
|
| 139 |
|
| 140 |
(define (char-cmp? cmp a b) |
| 141 |
(cmp (char->integer a) (char->integer b))) |
| 142 |
(define (char-ci-cmp? cmp a b) |
| 143 |
(cmp (char->integer (char-downcase a)) (char->integer (char-downcase b)))) |
| 144 |
|
| 145 |
(define (char=? a b) (char-cmp? = a b)) |
| 146 |
(define (char<? a b) (char-cmp? < a b)) |
| 147 |
(define (char>? a b) (char-cmp? > a b)) |
| 148 |
(define (char<=? a b) (char-cmp? <= a b)) |
| 149 |
(define (char>=? a b) (char-cmp? >= a b)) |
| 150 |
|
| 151 |
(define (char-ci=? a b) (char-ci-cmp? = a b)) |
| 152 |
(define (char-ci<? a b) (char-ci-cmp? < a b)) |
| 153 |
(define (char-ci>? a b) (char-ci-cmp? > a b)) |
| 154 |
(define (char-ci<=? a b) (char-ci-cmp? <= a b)) |
| 155 |
(define (char-ci>=? a b) (char-ci-cmp? >= a b)) |
| 156 |
|
| 157 |
(define (digit-value ch) |
| 158 |
(if (and (char<=? #\0 ch) (char<=? ch #\9)) |
| 159 |
(- (char->integer ch) (char->integer #\0)) |
| 160 |
#f)) |
| 161 |
|
| 162 |
(define char-foldcase char-downcase) |
| 163 |
|
| 164 |
; Note the trick of returning (cmp x y) |
| 165 |
(define (string-cmp? chcmp cmp a b) |
| 166 |
(let ((na (string-length a)) (nb (string-length b))) |
| 167 |
(let loop ((i 0)) |
| 168 |
(cond |
| 169 |
((= i na) |
| 170 |
(if (= i nb) (cmp 0 0) (cmp 0 1))) |
| 171 |
((= i nb) |
| 172 |
(cmp 1 0)) |
| 173 |
((chcmp = (string-ref a i) (string-ref b i)) |
| 174 |
(loop (succ i))) |
| 175 |
(else |
| 176 |
(chcmp cmp (string-ref a i) (string-ref b i))))))) |
| 177 |
|
| 178 |
|
| 179 |
(define (string=? a b) (string-cmp? char-cmp? = a b)) |
| 180 |
(define (string<? a b) (string-cmp? char-cmp? < a b)) |
| 181 |
(define (string>? a b) (string-cmp? char-cmp? > a b)) |
| 182 |
(define (string<=? a b) (string-cmp? char-cmp? <= a b)) |
| 183 |
(define (string>=? a b) (string-cmp? char-cmp? >= a b)) |
| 184 |
|
| 185 |
(define (string-ci=? a b) (string-cmp? char-ci-cmp? = a b)) |
| 186 |
(define (string-ci<? a b) (string-cmp? char-ci-cmp? < a b)) |
| 187 |
(define (string-ci>? a b) (string-cmp? char-ci-cmp? > a b)) |
| 188 |
(define (string-ci<=? a b) (string-cmp? char-ci-cmp? <= a b)) |
| 189 |
(define (string-ci>=? a b) (string-cmp? char-ci-cmp? >= a b)) |
| 190 |
|
| 191 |
(define (list . x) x) |
| 192 |
|
| 193 |
(define (foldr f x lst) |
| 194 |
(if (null? lst) |
| 195 |
x |
| 196 |
(foldr f (f x (car lst)) (cdr lst)))) |
| 197 |
|
| 198 |
(define (unzip1-with-cdr . lists) |
| 199 |
(unzip1-with-cdr-iterative lists '() '())) |
| 200 |
|
| 201 |
(define (unzip1-with-cdr-iterative lists cars cdrs) |
| 202 |
(if (null? lists) |
| 203 |
(cons cars cdrs) |
| 204 |
(let ((car1 (caar lists)) |
| 205 |
(cdr1 (cdar lists))) |
| 206 |
(unzip1-with-cdr-iterative |
| 207 |
(cdr lists) |
| 208 |
(append cars (list car1)) |
| 209 |
(append cdrs (list cdr1)))))) |
| 210 |
|
| 211 |
(define (map proc . lists) |
| 212 |
(if (null? lists) |
| 213 |
(apply proc) |
| 214 |
(if (null? (car lists)) |
| 215 |
'() |
| 216 |
(let* ((unz (apply unzip1-with-cdr lists)) |
| 217 |
(cars (car unz)) |
| 218 |
(cdrs (cdr unz))) |
| 219 |
(cons (apply proc cars) (apply map (cons proc cdrs))))))) |
| 220 |
|
| 221 |
(define (for-each proc . lists) |
| 222 |
(if (null? lists) |
| 223 |
(apply proc) |
| 224 |
(if (null? (car lists)) |
| 225 |
#t |
| 226 |
(let* ((unz (apply unzip1-with-cdr lists)) |
| 227 |
(cars (car unz)) |
| 228 |
(cdrs (cdr unz))) |
| 229 |
(apply proc cars) (apply map (cons proc cdrs)))))) |
| 230 |
|
| 231 |
(define (make-list k . fill) (vector->list (vector k (car fill)))) |
| 232 |
|
| 233 |
(define (list-copy l) (vector->list (list->vector l))) |
| 234 |
|
| 235 |
(define (list-tail x k) |
| 236 |
(if (zero? k) |
| 237 |
x |
| 238 |
(list-tail (cdr x) (- k 1)))) |
| 239 |
|
| 240 |
(define (list-ref x k) |
| 241 |
(car (list-tail x k))) |
| 242 |
|
| 243 |
(define (last-pair x) |
| 244 |
(if (pair? (cdr x)) |
| 245 |
(last-pair (cdr x)) |
| 246 |
x)) |
| 247 |
|
| 248 |
(define (head stream) (car stream)) |
| 249 |
|
| 250 |
(define (tail stream) (force (cdr stream))) |
| 251 |
|
| 252 |
(define (vector-equal? x y) |
| 253 |
(and (vector? x) (vector? y) (= (vector-length x) (vector-length y)) |
| 254 |
(let ((n (vector-length x))) |
| 255 |
(let loop ((i 0)) |
| 256 |
(if (= i n) |
| 257 |
#t |
| 258 |
(and (equal? (vector-ref x i) (vector-ref y i)) |
| 259 |
(loop (succ i)))))))) |
| 260 |
|
| 261 |
(define (list->vector x) |
| 262 |
(apply vector x)) |
| 263 |
|
| 264 |
;TODO vector-fill! v e start end |
| 265 |
(define (vector-fill! v e) |
| 266 |
(let ((n (vector-length v))) |
| 267 |
(let loop ((i 0)) |
| 268 |
(if (= i n) |
| 269 |
v |
| 270 |
(begin (vector-set! v i e) (loop (succ i))))))) |
| 271 |
|
| 272 |
(define (vector->list v) |
| 273 |
(let loop ((n (pred (vector-length v))) (l '())) |
| 274 |
(if (= n -1) |
| 275 |
l |
| 276 |
(loop (pred n) (cons (vector-ref v n) l))))) |
| 277 |
|
| 278 |
;TODO vector->string vector start end |
| 279 |
|
| 280 |
(define (string->vector . args) |
| 281 |
(list->vector (string->list (apply string-copy args)))) |
| 282 |
|
| 283 |
;TODO vector-copy v s e |
| 284 |
;TODO vector-copy! to at v s e |
| 285 |
|
| 286 |
(define (vector-append hd . tl) |
| 287 |
(if (null? tl) |
| 288 |
hd |
| 289 |
(list->vector (append (hd (vector->list (vector-append tl))))))) |
| 290 |
|
| 291 |
;; The following quasiquote macro is due to Eric S. Tiedemann. |
| 292 |
;; Copyright 1988 by Eric S. Tiedemann; all rights reserved. |
| 293 |
;; |
| 294 |
;; Subsequently modified to handle vectors: D. Souflis |
| 295 |
|
| 296 |
(macro |
| 297 |
quasiquote |
| 298 |
(lambda (l) |
| 299 |
(define (mcons f l r) |
| 300 |
(if (and (pair? r) |
| 301 |
(eq? (car r) 'quote) |
| 302 |
(eq? (car (cdr r)) (cdr f)) |
| 303 |
(pair? l) |
| 304 |
(eq? (car l) 'quote) |
| 305 |
(eq? (car (cdr l)) (car f))) |
| 306 |
(if (or (procedure? f) (number? f) (string? f)) |
| 307 |
f |
| 308 |
(list 'quote f)) |
| 309 |
(if (eqv? l vector) |
| 310 |
(apply l (eval r)) |
| 311 |
(list 'cons l r) |
| 312 |
))) |
| 313 |
(define (mappend f l r) |
| 314 |
(if (or (null? (cdr f)) |
| 315 |
(and (pair? r) |
| 316 |
(eq? (car r) 'quote) |
| 317 |
(eq? (car (cdr r)) '()))) |
| 318 |
l |
| 319 |
(list 'append l r))) |
| 320 |
(define (foo level form) |
| 321 |
(cond ((not (pair? form)) |
| 322 |
(if (or (procedure? form) (number? form) (string? form)) |
| 323 |
form |
| 324 |
(list 'quote form)) |
| 325 |
) |
| 326 |
((eq? 'quasiquote (car form)) |
| 327 |
(mcons form ''quasiquote (foo (+ level 1) (cdr form)))) |
| 328 |
(#t (if (zero? level) |
| 329 |
(cond ((eq? (car form) 'unquote) (car (cdr form))) |
| 330 |
((eq? (car form) 'unquote-splicing) |
| 331 |
(error "Unquote-splicing wasn't in a list:" |
| 332 |
form)) |
| 333 |
((and (pair? (car form)) |
| 334 |
(eq? (car (car form)) 'unquote-splicing)) |
| 335 |
(mappend form (car (cdr (car form))) |
| 336 |
(foo level (cdr form)))) |
| 337 |
(#t (mcons form (foo level (car form)) |
| 338 |
(foo level (cdr form))))) |
| 339 |
(cond ((eq? (car form) 'unquote) |
| 340 |
(mcons form ''unquote (foo (- level 1) |
| 341 |
(cdr form)))) |
| 342 |
((eq? (car form) 'unquote-splicing) |
| 343 |
(mcons form ''unquote-splicing |
| 344 |
(foo (- level 1) (cdr form)))) |
| 345 |
(#t (mcons form (foo level (car form)) |
| 346 |
(foo level (cdr form))))))))) |
| 347 |
(foo 0 (car (cdr l))))) |
| 348 |
|
| 349 |
;;;;;Helper for the dynamic-wind definition. By Tom Breton (Tehom) |
| 350 |
(define (shared-tail x y) |
| 351 |
(let ((len-x (length x)) |
| 352 |
(len-y (length y))) |
| 353 |
(define (shared-tail-helper x y) |
| 354 |
(if |
| 355 |
(eq? x y) |
| 356 |
x |
| 357 |
(shared-tail-helper (cdr x) (cdr y)))) |
| 358 |
|
| 359 |
(cond |
| 360 |
((> len-x len-y) |
| 361 |
(shared-tail-helper |
| 362 |
(list-tail x (- len-x len-y)) |
| 363 |
y)) |
| 364 |
((< len-x len-y) |
| 365 |
(shared-tail-helper |
| 366 |
x |
| 367 |
(list-tail y (- len-y len-x)))) |
| 368 |
(#t (shared-tail-helper x y))))) |
| 369 |
|
| 370 |
;;;;;Dynamic-wind by Tom Breton (Tehom) |
| 371 |
|
| 372 |
;;Guarded because we must only eval this once, because doing so |
| 373 |
;;redefines call/cc in terms of old call/cc |
| 374 |
(unless (defined? 'dynamic-wind) |
| 375 |
(let |
| 376 |
;;These functions are defined in the context of a private list of |
| 377 |
;;pairs of before/after procs. |
| 378 |
( (*active-windings* '()) |
| 379 |
;;We'll define some functions into the larger environment, so |
| 380 |
;;we need to know it. |
| 381 |
(outer-env (current-environment))) |
| 382 |
|
| 383 |
;;Poor-man's structure operations |
| 384 |
(define before-func car) |
| 385 |
(define after-func cdr) |
| 386 |
(define make-winding cons) |
| 387 |
|
| 388 |
;;Manage active windings |
| 389 |
(define (activate-winding! new) |
| 390 |
((before-func new)) |
| 391 |
(set! *active-windings* (cons new *active-windings*))) |
| 392 |
(define (deactivate-top-winding!) |
| 393 |
(let ((old-top (car *active-windings*))) |
| 394 |
;;Remove it from the list first so it's not active during its |
| 395 |
;;own exit. |
| 396 |
(set! *active-windings* (cdr *active-windings*)) |
| 397 |
((after-func old-top)))) |
| 398 |
|
| 399 |
(define (set-active-windings! new-ws) |
| 400 |
(unless (eq? new-ws *active-windings*) |
| 401 |
(let ((shared (shared-tail new-ws *active-windings*))) |
| 402 |
|
| 403 |
;;Define the looping functions. |
| 404 |
;;Exit the old list. Do deeper ones last. Don't do |
| 405 |
;;any shared ones. |
| 406 |
(define (pop-many) |
| 407 |
(unless (eq? *active-windings* shared) |
| 408 |
(deactivate-top-winding!) |
| 409 |
(pop-many))) |
| 410 |
;;Enter the new list. Do deeper ones first so that the |
| 411 |
;;deeper windings will already be active. Don't do any |
| 412 |
;;shared ones. |
| 413 |
(define (push-many new-ws) |
| 414 |
(unless (eq? new-ws shared) |
| 415 |
(push-many (cdr new-ws)) |
| 416 |
(activate-winding! (car new-ws)))) |
| 417 |
|
| 418 |
;;Do it. |
| 419 |
(pop-many) |
| 420 |
(push-many new-ws)))) |
| 421 |
|
| 422 |
;;The definitions themselves. |
| 423 |
(eval |
| 424 |
`(define call-with-current-continuation |
| 425 |
;;It internally uses the built-in call/cc, so capture it. |
| 426 |
,(let ((old-c/cc call-with-current-continuation)) |
| 427 |
(lambda (func) |
| 428 |
;;Use old call/cc to get the continuation. |
| 429 |
(old-c/cc |
| 430 |
(lambda (continuation) |
| 431 |
;;Call func with not the continuation itself |
| 432 |
;;but a procedure that adjusts the active |
| 433 |
;;windings to what they were when we made |
| 434 |
;;this, and only then calls the |
| 435 |
;;continuation. |
| 436 |
(func |
| 437 |
(let ((current-ws *active-windings*)) |
| 438 |
(lambda (x) |
| 439 |
(set-active-windings! current-ws) |
| 440 |
(continuation x))))))))) |
| 441 |
outer-env) |
| 442 |
;;We can't just say "define (dynamic-wind before thunk after)" |
| 443 |
;;because the lambda it's defined to lives in this environment, |
| 444 |
;;not in the global environment. |
| 445 |
(eval |
| 446 |
`(define dynamic-wind |
| 447 |
,(lambda (before thunk after) |
| 448 |
;;Make a new winding |
| 449 |
(activate-winding! (make-winding before after)) |
| 450 |
(let ((result (thunk))) |
| 451 |
;;Get rid of the new winding. |
| 452 |
(deactivate-top-winding!) |
| 453 |
;;The return value is that of thunk. |
| 454 |
result))) |
| 455 |
outer-env))) |
| 456 |
|
| 457 |
(define call/cc call-with-current-continuation) |
| 458 |
|
| 459 |
(define (symbol=? hd . tl) |
| 460 |
(if (null? tl) |
| 461 |
#t |
| 462 |
(and (symbol? hd) (eq? hd (car tl)) (symbol=? (cdr tl))))) |
| 463 |
|
| 464 |
(define (boolean=? hd . tl) |
| 465 |
(if (null? tl) |
| 466 |
#t |
| 467 |
(and (boolean? hd) (eq? hd (car tl)) (boolean=? (cdr tl))))) |
| 468 |
|
| 469 |
;;;;; atom? and equal? written by a.k |
| 470 |
|
| 471 |
;;;; atom? |
| 472 |
(define (atom? x) |
| 473 |
(not (pair? x))) |
| 474 |
|
| 475 |
;;;; equal? |
| 476 |
(define (equal? x y) |
| 477 |
(cond |
| 478 |
((pair? x) |
| 479 |
(and (pair? y) |
| 480 |
(equal? (car x) (car y)) |
| 481 |
(equal? (cdr x) (cdr y)))) |
| 482 |
((vector? x) |
| 483 |
(and (vector? y) (vector-equal? x y))) |
| 484 |
((string? x) |
| 485 |
(and (string? y) (string=? x y))) |
| 486 |
(else (eqv? x y)))) |
| 487 |
|
| 488 |
;;;; (do ((var init inc) ...) (endtest result ...) body ...) |
| 489 |
;; |
| 490 |
(macro do |
| 491 |
(lambda (do-macro) |
| 492 |
(apply (lambda (do vars endtest . body) |
| 493 |
(let ((do-loop (gensym))) |
| 494 |
`(letrec ((,do-loop |
| 495 |
(lambda ,(map (lambda (x) |
| 496 |
(if (pair? x) (car x) x)) |
| 497 |
`,vars) |
| 498 |
(if ,(car endtest) |
| 499 |
(begin ,@(cdr endtest)) |
| 500 |
(begin |
| 501 |
,@body |
| 502 |
(,do-loop |
| 503 |
,@(map (lambda (x) |
| 504 |
(cond |
| 505 |
((not (pair? x)) x) |
| 506 |
((< (length x) 3) (car x)) |
| 507 |
(else (car (cdr (cdr x)))))) |
| 508 |
`,vars))))))) |
| 509 |
(,do-loop |
| 510 |
,@(map (lambda (x) |
| 511 |
(if (and (pair? x) (cdr x)) |
| 512 |
(car (cdr x)) |
| 513 |
'())) |
| 514 |
`,vars))))) |
| 515 |
do-macro))) |
| 516 |
|
| 517 |
;;;; generic-member |
| 518 |
(define (generic-member cmp obj lst) |
| 519 |
(cond |
| 520 |
((null? lst) #f) |
| 521 |
((cmp obj (car lst)) lst) |
| 522 |
(else (generic-member cmp obj (cdr lst))))) |
| 523 |
|
| 524 |
(define (memq obj lst) |
| 525 |
(generic-member eq? obj lst)) |
| 526 |
(define (memv obj lst) |
| 527 |
(generic-member eqv? obj lst)) |
| 528 |
(define (member obj lst) |
| 529 |
(generic-member equal? obj lst)) |
| 530 |
|
| 531 |
;;;; generic-assoc |
| 532 |
(define (generic-assoc cmp obj alst) |
| 533 |
(cond |
| 534 |
((null? alst) #f) |
| 535 |
((cmp obj (caar alst)) (car alst)) |
| 536 |
(else (generic-assoc cmp obj (cdr alst))))) |
| 537 |
|
| 538 |
(define (assq obj alst) |
| 539 |
(generic-assoc eq? obj alst)) |
| 540 |
(define (assv obj alst) |
| 541 |
(generic-assoc eqv? obj alst)) |
| 542 |
(define (assoc obj alst) |
| 543 |
(generic-assoc equal? obj alst)) |
| 544 |
|
| 545 |
(define (acons x y z) (cons (cons x y) z)) |
| 546 |
|
| 547 |
;;;; Handy for imperative programs |
| 548 |
;;;; Used as: (define-with-return (foo x y) .... (return z) ...) |
| 549 |
(macro (define-with-return form) |
| 550 |
`(define ,(cadr form) |
| 551 |
(call/cc (lambda (return) ,@(cddr form))))) |
| 552 |
|
| 553 |
;;;; Simple exception handling |
| 554 |
; |
| 555 |
; Exceptions are caught as follows: |
| 556 |
; |
| 557 |
; (catch (do-something to-recover and-return meaningful-value) |
| 558 |
; (if-something goes-wrong) |
| 559 |
; (with-these calls)) |
| 560 |
; |
| 561 |
; "Catch" establishes a scope spanning multiple call-frames |
| 562 |
; until another "catch" is encountered. |
| 563 |
; |
| 564 |
; Exceptions are thrown with: |
| 565 |
; |
| 566 |
; (throw "message") |
| 567 |
; |
| 568 |
; If used outside a (catch ...), reverts to (error "message) |
| 569 |
|
| 570 |
(define *handlers* (list)) |
| 571 |
|
| 572 |
(define (push-handler proc) |
| 573 |
(set! *handlers* (cons proc *handlers*))) |
| 574 |
|
| 575 |
(define (pop-handler) |
| 576 |
(let ((h (car *handlers*))) |
| 577 |
(set! *handlers* (cdr *handlers*)) |
| 578 |
h)) |
| 579 |
|
| 580 |
(define (more-handlers?) |
| 581 |
(pair? *handlers*)) |
| 582 |
|
| 583 |
(define (throw . x) |
| 584 |
(if (more-handlers?) |
| 585 |
(apply (pop-handler)) |
| 586 |
(apply error x))) |
| 587 |
|
| 588 |
; catch handler thunk |
| 589 |
(macro (catch form) |
| 590 |
(let ((label (gensym))) |
| 591 |
`(call/cc (lambda (exit) |
| 592 |
(push-handler (lambda () (exit ,(cadr form)))) |
| 593 |
(let ((,label (begin ,@(cddr form)))) |
| 594 |
(pop-handler) |
| 595 |
,label))))) |
| 596 |
|
| 597 |
(define *error-hook* throw) |
| 598 |
|
| 599 |
; same as above, r7rs |
| 600 |
(define (with-exception-handler handler thunk) |
| 601 |
(catch (handler) (thunk))) |
| 602 |
|
| 603 |
(define (raise-continuable x) |
| 604 |
(if (more-handlers?) |
| 605 |
((pop-handler) x) |
| 606 |
(error x))) |
| 607 |
|
| 608 |
(define (raise x) |
| 609 |
(raise-continuable x) |
| 610 |
(error "raise: exception handler returned")) |
| 611 |
|
| 612 |
;(with-exception-handler |
| 613 |
; (lambda () (display (list "xerror"))) |
| 614 |
; (lambda () (begin (display ("aaa") (raise 5))))) |
| 615 |
|
| 616 |
;TODO: a lot more is missing, and it doesn't work |
| 617 |
|
| 618 |
;;;;; Definition of MAKE-ENVIRONMENT, to be used with two-argument EVAL |
| 619 |
|
| 620 |
(macro (make-environment form) |
| 621 |
`(apply (lambda () |
| 622 |
,@(cdr form) |
| 623 |
(current-environment)))) |
| 624 |
|
| 625 |
(define-macro (eval-polymorphic x . envl) |
| 626 |
(display envl) |
| 627 |
(let* ((env (if (null? envl) (current-environment) (eval (car envl)))) |
| 628 |
(xval (eval x env))) |
| 629 |
(if (closure? xval) |
| 630 |
(make-closure (get-closure-code xval) env) |
| 631 |
xval))) |
| 632 |
|
| 633 |
; Redefine this if you install another package infrastructure |
| 634 |
; Also redefine 'package' |
| 635 |
(define *colon-hook* eval) |
| 636 |
|
| 637 |
;;;;; I/O |
| 638 |
|
| 639 |
(define (input-output-port? p) |
| 640 |
(and (input-port? p) (output-port? p))) |
| 641 |
|
| 642 |
(define (close-port p) |
| 643 |
(cond |
| 644 |
((input-output-port? p) (close-input-port (close-output-port p))) |
| 645 |
((input-port? p) (close-input-port p)) |
| 646 |
((output-port? p) (close-output-port p)) |
| 647 |
(else (throw "Not a port" p)))) |
| 648 |
|
| 649 |
(define (call-with-input-file s p) |
| 650 |
(let ((inport (open-input-file s))) |
| 651 |
(if (eq? inport #f) |
| 652 |
#f |
| 653 |
(let ((res (p inport))) |
| 654 |
(close-input-port inport) |
| 655 |
res)))) |
| 656 |
|
| 657 |
(define (call-with-output-file s p) |
| 658 |
(let ((outport (open-output-file s))) |
| 659 |
(if (eq? outport #f) |
| 660 |
#f |
| 661 |
(let ((res (p outport))) |
| 662 |
(close-output-port outport) |
| 663 |
res)))) |
| 664 |
|
| 665 |
(define (with-input-from-file s p) |
| 666 |
(let ((inport (open-input-file s))) |
| 667 |
(if (eq? inport #f) |
| 668 |
#f |
| 669 |
(let ((prev-inport (current-input-port))) |
| 670 |
(set-input-port inport) |
| 671 |
(let ((res (p))) |
| 672 |
(close-input-port inport) |
| 673 |
(set-input-port prev-inport) |
| 674 |
res))))) |
| 675 |
|
| 676 |
(define (with-output-to-file s p) |
| 677 |
(let ((outport (open-output-file s))) |
| 678 |
(if (eq? outport #f) |
| 679 |
#f |
| 680 |
(let ((prev-outport (current-output-port))) |
| 681 |
(set-output-port outport) |
| 682 |
(let ((res (p))) |
| 683 |
(close-output-port outport) |
| 684 |
(set-output-port prev-outport) |
| 685 |
res))))) |
| 686 |
|
| 687 |
(define (with-input-output-from-to-files si so p) |
| 688 |
(let ((inport (open-input-file si)) |
| 689 |
(outport (open-input-file so))) |
| 690 |
(if (not (and inport outport)) |
| 691 |
(begin |
| 692 |
(close-input-port inport) |
| 693 |
(close-output-port outport) |
| 694 |
#f) |
| 695 |
(let ((prev-inport (current-input-port)) |
| 696 |
(prev-outport (current-output-port))) |
| 697 |
(set-input-port inport) |
| 698 |
(set-output-port outport) |
| 699 |
(let ((res (p))) |
| 700 |
(close-input-port inport) |
| 701 |
(close-output-port outport) |
| 702 |
(set-input-port prev-inport) |
| 703 |
(set-output-port prev-outport) |
| 704 |
res))))) |
| 705 |
|
| 706 |
; Random number generator (maximum cycle) |
| 707 |
(define *seed* 1) |
| 708 |
(define (random-next) |
| 709 |
(let* ((a 16807) (m 2147483647) (q (quotient m a)) (r (modulo m a))) |
| 710 |
(set! *seed* |
| 711 |
(- (* a (- *seed* |
| 712 |
(* (quotient *seed* q) q))) |
| 713 |
(* (quotient *seed* q) r))) |
| 714 |
(if (< *seed* 0) (set! *seed* (+ *seed* m))) |
| 715 |
*seed*)) |
| 716 |
|
| 717 |
;; SRFI-0 |
| 718 |
;; COND-EXPAND |
| 719 |
;; Implemented as a macro |
| 720 |
(define *features* '(srfi-0)) |
| 721 |
|
| 722 |
(define-macro (cond-expand . cond-action-list) |
| 723 |
(cond-expand-runtime cond-action-list)) |
| 724 |
|
| 725 |
(define (cond-expand-runtime cond-action-list) |
| 726 |
(if (null? cond-action-list) |
| 727 |
#t |
| 728 |
(if (cond-eval (caar cond-action-list)) |
| 729 |
`(begin ,@(cdar cond-action-list)) |
| 730 |
(cond-expand-runtime (cdr cond-action-list))))) |
| 731 |
|
| 732 |
(define (cond-eval-and cond-list) |
| 733 |
(foldr (lambda (x y) (and (cond-eval x) (cond-eval y))) #t cond-list)) |
| 734 |
|
| 735 |
(define (cond-eval-or cond-list) |
| 736 |
(foldr (lambda (x y) (or (cond-eval x) (cond-eval y))) #f cond-list)) |
| 737 |
|
| 738 |
(define (cond-eval condition) |
| 739 |
(cond |
| 740 |
((symbol? condition) |
| 741 |
(if (member condition *features*) #t #f)) |
| 742 |
((eq? condition #t) #t) |
| 743 |
((eq? condition #f) #f) |
| 744 |
(else (case (car condition) |
| 745 |
((and) (cond-eval-and (cdr condition))) |
| 746 |
((or) (cond-eval-or (cdr condition))) |
| 747 |
((not) (if (not (null? (cddr condition))) |
| 748 |
(error "cond-expand : 'not' takes 1 argument") |
| 749 |
(not (cond-eval (cadr condition))))) |
| 750 |
(else (error "cond-expand : unknown operator" (car condition))))))) |
| 751 |
|
| 752 |
; compatibility functions added by schmorp@schmorp.de |
| 753 |
(macro (defmacro dform) |
| 754 |
(let ((name (cadr dform)) (formals (caddr dform)) (body (cdddr dform))) |
| 755 |
`(define-macro (,name . ,formals) ,@body))) |
| 756 |
|
| 757 |
;; r7rs |
| 758 |
; sring-map, vector-map, string-for-each, vector-for-each |
| 759 |
; bytevectors |
| 760 |
|
| 761 |
;; srfi-1 |
| 762 |
|
| 763 |
(define (check-arg pred val caller) |
| 764 |
(let lp ((val val)) |
| 765 |
(if (pred val) val (lp (error "Bad argument" val pred caller))))) |
| 766 |
|
| 767 |
; Some macros and functions that the SRFI 1 reference implementation |
| 768 |
; requires that it does not define and are not part of R5RS. |
| 769 |
|
| 770 |
(define-macro let-optionals |
| 771 |
(lambda (input names . code) |
| 772 |
(let ((input-left (gensym))) |
| 773 |
`(let ((,input-left ,input)) |
| 774 |
,(let next ((names names)) |
| 775 |
(if (null? names) |
| 776 |
`(begin ,@code) |
| 777 |
`(let ((,input-left (if (null? ,input-left) |
| 778 |
'() |
| 779 |
(cdr ,input-left))) |
| 780 |
(,(caar names) (if (null? ,input-left) |
| 781 |
,(cadar names) |
| 782 |
(car ,input-left)))) |
| 783 |
,(next (cdr names))))))))) |
| 784 |
|
| 785 |
(define-macro receive |
| 786 |
(lambda (names values . code) |
| 787 |
`(call-with-values (lambda () ,values) |
| 788 |
(lambda ,names ,@code)))) |
| 789 |
|
| 790 |
|
| 791 |
(define (:optional data default) |
| 792 |
(if (null? data) |
| 793 |
default |
| 794 |
(car data))) |
| 795 |
|
| 796 |
(load "srfi-1.scm") |
| 797 |
|
| 798 |
;(load "srfi-55.scm") |
| 799 |
|
| 800 |
;(register-extension '(srfi 1) (lamba () (load "srfi-1.scm"))) |
| 801 |
;(register-extension '(srfi 23) (lamba () ())) ; error builtin |
| 802 |
;(register-extension '(srfi 55) (lamba () ())) ; always available |
| 803 |
|
| 804 |
;; end of init |
| 805 |
|
| 806 |
;(load "test.scm") |
| 807 |
|
| 808 |
;; macros-by-example |
| 809 |
|
| 810 |
(define append! |
| 811 |
(lambda args |
| 812 |
(cond ((null? args) '()) |
| 813 |
((null? (cdr args)) (car args)) |
| 814 |
((null? (car args)) (apply comlist:nconc (cdr args))) |
| 815 |
(else |
| 816 |
(set-cdr! (last-pair (car args)) |
| 817 |
(apply comlist:nconc (cdr args))) |
| 818 |
(car args))))) |
| 819 |
|
| 820 |
(define (some pred lst . rest) |
| 821 |
(cond ((null? rest) |
| 822 |
(let mapf ((lst lst)) |
| 823 |
(and (not (null? lst)) |
| 824 |
(or (pred (car lst)) (mapf (cdr lst)))))) |
| 825 |
(else (let mapf ((lst lst) (rest rest)) |
| 826 |
(and (not (null? lst)) |
| 827 |
(or (apply pred (car lst) (map car rest)) |
| 828 |
(mapf (cdr lst) (map cdr rest)))))))) |
| 829 |
|
| 830 |
(define (every pred lst . rest) |
| 831 |
(cond ((null? rest) |
| 832 |
(let mapf ((lst lst)) |
| 833 |
(or (null? lst) |
| 834 |
(and (pred (car lst)) (mapf (cdr lst)))))) |
| 835 |
(else (let mapf ((lst lst) (rest rest)) |
| 836 |
(or (null? lst) |
| 837 |
(and (apply pred (car lst) (map car rest)) |
| 838 |
(mapf (cdr lst) (map cdr rest)))))))) |
| 839 |
|
| 840 |
(load "mbe.scm") |
| 841 |
|
| 842 |
(load "test.scm") |
| 843 |
|
| 844 |
(gc-verbose #f) |
