3 ;;;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
5 ;;;; This program is free software; you can redistribute it and/or modify
6 ;;;; it under the terms of the GNU General Public License as published by
7 ;;;; the Free Software Foundation; either version 2, or (at your option)
8 ;;;; any later version.
10 ;;;; This program is distributed in the hope that it will be useful,
11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ;;;; GNU General Public License for more details.
15 ;;;; You should have received a copy of the GNU General Public License
16 ;;;; along with this software; see the file COPYING. If not, write to
17 ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
18 ;;;; Boston, MA 02111-1307 USA
20 ;;;; As a special exception, the Free Software Foundation gives permission
21 ;;;; for additional uses of the text contained in its release of GUILE.
23 ;;;; The exception is that, if you link the GUILE library with other files
24 ;;;; to produce an executable, this does not by itself cause the
25 ;;;; resulting executable to be covered by the GNU General Public License.
26 ;;;; Your use of that executable is in no way restricted on account of
27 ;;;; linking the GUILE library code into it.
29 ;;;; This exception does not however invalidate any other reasons why
30 ;;;; the executable file might be covered by the GNU General Public License.
32 ;;;; This exception applies only to the code released by the
33 ;;;; Free Software Foundation under the name GUILE. If you copy
34 ;;;; code from other Free Software Foundation releases into a copy of
35 ;;;; GUILE, as the General Public License permits, the exception does
36 ;;;; not apply to the code that you add in this way. To avoid misleading
37 ;;;; anyone as to the status of such modified files, you must delete
38 ;;;; this exception notice from them.
40 ;;;; If you write modifications of your own for GUILE, it is your choice
41 ;;;; whether to permit this exception to apply to your modifications.
42 ;;;; If you do not wish that, delete this exception notice.
48 ;;; This file is the first thing loaded into Guile. It adds many mundane
49 ;;; definitions and a few that are interesting.
51 ;;; The module system (hence the hierarchical namespace) are defined in this
61 ;; We don't have macros here, but we do want to define
62 ;; `begin-deprecated' early.
64 (define begin-deprecated
65 (procedure->memoizing-macro
67 (if (include-deprecated-features)
76 (if (not (memq sym *features*))
77 (set! *features* (cons sym *features*))))
79 ;;; Return #t iff FEATURE is available to this Guile interpreter.
80 ;;; In SLIB, provided? also checks to see if the module is available.
81 ;;; We should do that too, but don't.
82 (define (provided? feature)
83 (and (memq feature *features*) #t))
86 (define feature? provided?))
88 ;;; let format alias simple-format until the more complete version is loaded
89 (define format simple-format)
94 (primitive-load-path "ice-9/r4rs.scm")
97 ;;; {Simple Debugging Tools}
101 ;; peek takes any number of arguments, writes them to the
102 ;; current ouput port, and returns the last argument.
103 ;; It is handy to wrap around an expression to look at
104 ;; a value each time is evaluated, e.g.:
106 ;; (+ 10 (troublesome-fn))
107 ;; => (+ 10 (pk 'troublesome-fn-returned (troublesome-fn)))
110 (define (peek . stuff)
115 (car (last-pair stuff)))
119 (define (warn . stuff)
120 (with-output-to-port (current-error-port)
123 (display ";;; WARNING ")
126 (car (last-pair stuff)))))
129 ;;; {Trivial Functions}
132 (define (identity x) x)
133 (define (1+ n) (+ n 1))
134 (define (1- n) (+ n -1))
135 (define (and=> value procedure) (and value (procedure value)))
136 (define (make-hash-table k) (make-vector k '()))
138 ;;; apply-to-args is functionally redundant with apply and, worse,
139 ;;; is less general than apply since it only takes two arguments.
141 ;;; On the other hand, apply-to-args is a syntacticly convenient way to
142 ;;; perform binding in many circumstances when the "let" family of
143 ;;; of forms don't cut it. E.g.:
145 ;;; (apply-to-args (return-3d-mouse-coords)
150 (define (apply-to-args args fn) (apply fn args))
157 (define (ipow-by-squaring x k acc proc)
158 (cond ((zero? k) acc)
159 ((= 1 k) (proc acc x))
160 (else (ipow-by-squaring (proc x x)
162 (if (even? k) acc (proc acc x))
166 ;;; {Symbol Properties}
169 (define (symbol-property sym prop)
170 (let ((pair (assoc prop (symbol-pref sym))))
171 (and pair (cdr pair))))
173 (define (set-symbol-property! sym prop val)
174 (let ((pair (assoc prop (symbol-pref sym))))
177 (symbol-pset! sym (acons prop val (symbol-pref sym))))))
179 (define (symbol-property-remove! sym prop)
180 (let ((pair (assoc prop (symbol-pref sym))))
182 (symbol-pset! sym (delq! pair (symbol-pref sym))))))
184 ;;; {General Properties}
187 ;; This is a more modern interface to properties. It will replace all
188 ;; other property-like things eventually.
190 (define (make-object-property)
191 (let ((prop (primitive-make-property #f)))
192 (make-procedure-with-setter
193 (lambda (obj) (primitive-property-ref prop obj))
194 (lambda (obj val) (primitive-property-set! prop obj val)))))
201 (if (provided? 'array)
202 (primitive-load-path "ice-9/arrays.scm"))
208 (define (symbol->keyword symbol)
209 (make-keyword-from-dash-symbol (symbol-append '- symbol)))
211 (define (keyword->symbol kw)
212 (let ((sym (symbol->string (keyword-dash-symbol kw))))
213 (string->symbol (substring sym 1 (string-length sym)))))
215 (define (kw-arg-ref args kw)
216 (let ((rem (member kw args)))
217 (and rem (pair? (cdr rem)) (cadr rem))))
223 (define (struct-layout s)
224 (struct-ref (struct-vtable s) vtable-index-layout))
230 (define the-environment
235 (define the-root-environment (the-environment))
237 (define (environment-module env)
238 (let ((closure (and (pair? env) (car (last-pair env)))))
239 (and closure (procedure-property closure 'module))))
245 ;; Printing records: by default, records are printed as
247 ;; #<type-name field1: val1 field2: val2 ...>
249 ;; You can change that by giving a custom printing function to
250 ;; MAKE-RECORD-TYPE (after the list of field symbols). This function
251 ;; will be called like
253 ;; (<printer> object port)
255 ;; It should print OBJECT to PORT.
257 (define (inherit-print-state old-port new-port)
258 (if (get-print-state old-port)
259 (port-with-print-state new-port (get-print-state old-port))
262 ;; 0: type-name, 1: fields
263 (define record-type-vtable
264 (make-vtable-vtable "prpr" 0
266 (cond ((eq? s record-type-vtable)
267 (display "#<record-type-vtable>" p))
269 (display "#<record-type " p)
270 (display (record-type-name s) p)
273 (define (record-type? obj)
274 (and (struct? obj) (eq? record-type-vtable (struct-vtable obj))))
276 (define (make-record-type type-name fields . opt)
277 (let ((printer-fn (and (pair? opt) (car opt))))
278 (let ((struct (make-struct record-type-vtable 0
281 (map (lambda (f) "pw") fields)))
285 (display type-name p)
286 (let loop ((fields fields)
289 ((not (null? fields))
291 (display (car fields) p)
293 (display (struct-ref s off) p)
294 (loop (cdr fields) (+ 1 off)))))
297 (copy-tree fields))))
298 ;; Temporary solution: Associate a name to the record type descriptor
299 ;; so that the object system can create a wrapper class for it.
300 (set-struct-vtable-name! struct (if (symbol? type-name)
302 (string->symbol type-name)))
305 (define (record-type-name obj)
306 (if (record-type? obj)
307 (struct-ref obj vtable-offset-user)
308 (error 'not-a-record-type obj)))
310 (define (record-type-fields obj)
311 (if (record-type? obj)
312 (struct-ref obj (+ 1 vtable-offset-user))
313 (error 'not-a-record-type obj)))
315 (define (record-constructor rtd . opt)
316 (let ((field-names (if (pair? opt) (car opt) (record-type-fields rtd))))
317 (local-eval `(lambda ,field-names
318 (make-struct ',rtd 0 ,@(map (lambda (f)
319 (if (memq f field-names)
322 (record-type-fields rtd))))
323 the-root-environment)))
325 (define (record-predicate rtd)
326 (lambda (obj) (and (struct? obj) (eq? rtd (struct-vtable obj)))))
328 (define (record-accessor rtd field-name)
329 (let* ((pos (list-index (record-type-fields rtd) field-name)))
331 (error 'no-such-field field-name))
332 (local-eval `(lambda (obj)
333 (and (eq? ',rtd (record-type-descriptor obj))
334 (struct-ref obj ,pos)))
335 the-root-environment)))
337 (define (record-modifier rtd field-name)
338 (let* ((pos (list-index (record-type-fields rtd) field-name)))
340 (error 'no-such-field field-name))
341 (local-eval `(lambda (obj val)
342 (and (eq? ',rtd (record-type-descriptor obj))
343 (struct-set! obj ,pos val)))
344 the-root-environment)))
347 (define (record? obj)
348 (and (struct? obj) (record-type? (struct-vtable obj))))
350 (define (record-type-descriptor obj)
353 (error 'not-a-record obj)))
361 (define (->bool x) (not (not x)))
367 (define (symbol-append . args)
368 (string->symbol (apply string-append (map symbol->string args))))
370 (define (list->symbol . args)
371 (string->symbol (apply list->string args)))
373 (define (symbol . args)
374 (string->symbol (apply string args)))
380 (define (list-index l k)
386 (loop (+ n 1) (cdr l))))))
388 (define (make-list n . init)
389 (if (pair? init) (set! init (car init)))
390 (let loop ((answer '())
394 (loop (cons init answer) (- n 1)))))
397 ;;; {and-map and or-map}
399 ;;; (and-map fn lst) is like (and (fn (car lst)) (fn (cadr lst)) (fn...) ...)
400 ;;; (or-map fn lst) is like (or (fn (car lst)) (fn (cadr lst)) (fn...) ...)
405 ;; Apply f to successive elements of l until exhaustion or f returns #f.
406 ;; If returning early, return #f. Otherwise, return the last value returned
407 ;; by f. If f has never been called because l is empty, return #t.
409 (define (and-map f lst)
410 (let loop ((result #t)
415 (loop (f (car l)) (cdr l))))))
419 ;; Apply f to successive elements of l until exhaustion or while f returns #f.
420 ;; If returning early, return the return value of f.
422 (define (or-map f lst)
423 (let loop ((result #f)
427 (loop (f (car l)) (cdr l))))))
431 (if (provided? 'posix)
432 (primitive-load-path "ice-9/posix.scm"))
434 (if (provided? 'socket)
435 (primitive-load-path "ice-9/networking.scm"))
438 (if (provided? 'posix)
442 (let ((port (catch 'system-error (lambda () (open-file str OPEN_READ))
444 (if port (begin (close-port port) #t)
447 (define file-is-directory?
448 (if (provided? 'posix)
450 (eq? (stat:type (stat str)) 'directory))
452 (let ((port (catch 'system-error
453 (lambda () (open-file (string-append str "/.")
456 (if port (begin (close-port port) #t)
459 (define (has-suffix? str suffix)
460 (let ((sufl (string-length suffix))
461 (sl (string-length str)))
463 (string=? (substring str (- sl sufl) sl) suffix))))
465 (define (system-error-errno args)
466 (if (eq? (car args) 'system-error)
467 (car (list-ref args 4))
474 (define (error . args)
477 (scm-error 'misc-error #f "?" #f #f)
478 (let loop ((msg "~A")
480 (if (not (null? rest))
481 (loop (string-append msg " ~S")
483 (scm-error 'misc-error #f msg args #f)))))
485 ;; bad-throw is the hook that is called upon a throw to a an unhandled
486 ;; key (unless the throw has four arguments, in which case
487 ;; it's usually interpreted as an error throw.)
488 ;; If the key has a default handler (a throw-handler-default property),
489 ;; it is applied to the throw.
491 (define (bad-throw key . args)
492 (let ((default (symbol-property key 'throw-handler-default)))
493 (or (and default (apply default key args))
494 (apply error "unhandled-exception:" key args))))
498 (define (tm:sec obj) (vector-ref obj 0))
499 (define (tm:min obj) (vector-ref obj 1))
500 (define (tm:hour obj) (vector-ref obj 2))
501 (define (tm:mday obj) (vector-ref obj 3))
502 (define (tm:mon obj) (vector-ref obj 4))
503 (define (tm:year obj) (vector-ref obj 5))
504 (define (tm:wday obj) (vector-ref obj 6))
505 (define (tm:yday obj) (vector-ref obj 7))
506 (define (tm:isdst obj) (vector-ref obj 8))
507 (define (tm:gmtoff obj) (vector-ref obj 9))
508 (define (tm:zone obj) (vector-ref obj 10))
510 (define (set-tm:sec obj val) (vector-set! obj 0 val))
511 (define (set-tm:min obj val) (vector-set! obj 1 val))
512 (define (set-tm:hour obj val) (vector-set! obj 2 val))
513 (define (set-tm:mday obj val) (vector-set! obj 3 val))
514 (define (set-tm:mon obj val) (vector-set! obj 4 val))
515 (define (set-tm:year obj val) (vector-set! obj 5 val))
516 (define (set-tm:wday obj val) (vector-set! obj 6 val))
517 (define (set-tm:yday obj val) (vector-set! obj 7 val))
518 (define (set-tm:isdst obj val) (vector-set! obj 8 val))
519 (define (set-tm:gmtoff obj val) (vector-set! obj 9 val))
520 (define (set-tm:zone obj val) (vector-set! obj 10 val))
522 (define (tms:clock obj) (vector-ref obj 0))
523 (define (tms:utime obj) (vector-ref obj 1))
524 (define (tms:stime obj) (vector-ref obj 2))
525 (define (tms:cutime obj) (vector-ref obj 3))
526 (define (tms:cstime obj) (vector-ref obj 4))
528 (define file-position ftell)
529 (define (file-set-position port offset . whence)
530 (let ((whence (if (eq? whence '()) SEEK_SET (car whence))))
531 (seek port offset whence)))
533 (define (move->fdes fd/port fd)
534 (cond ((integer? fd/port)
535 (dup->fdes fd/port fd)
539 (primitive-move->fdes fd/port fd)
540 (set-port-revealed! fd/port 1)
543 (define (release-port-handle port)
544 (let ((revealed (port-revealed port)))
546 (set-port-revealed! port (- revealed 1)))))
548 (define (dup->port port/fd mode . maybe-fd)
549 (let ((port (fdopen (apply dup->fdes port/fd maybe-fd)
552 (set-port-revealed! port 1))
555 (define (dup->inport port/fd . maybe-fd)
556 (apply dup->port port/fd "r" maybe-fd))
558 (define (dup->outport port/fd . maybe-fd)
559 (apply dup->port port/fd "w" maybe-fd))
561 (define (dup port/fd . maybe-fd)
562 (if (integer? port/fd)
563 (apply dup->fdes port/fd maybe-fd)
564 (apply dup->port port/fd (port-mode port/fd) maybe-fd)))
566 (define (duplicate-port port modes)
567 (dup->port port modes))
569 (define (fdes->inport fdes)
570 (let loop ((rest-ports (fdes->ports fdes)))
571 (cond ((null? rest-ports)
572 (let ((result (fdopen fdes "r")))
573 (set-port-revealed! result 1)
575 ((input-port? (car rest-ports))
576 (set-port-revealed! (car rest-ports)
577 (+ (port-revealed (car rest-ports)) 1))
580 (loop (cdr rest-ports))))))
582 (define (fdes->outport fdes)
583 (let loop ((rest-ports (fdes->ports fdes)))
584 (cond ((null? rest-ports)
585 (let ((result (fdopen fdes "w")))
586 (set-port-revealed! result 1)
588 ((output-port? (car rest-ports))
589 (set-port-revealed! (car rest-ports)
590 (+ (port-revealed (car rest-ports)) 1))
593 (loop (cdr rest-ports))))))
595 (define (port->fdes port)
596 (set-port-revealed! port (+ (port-revealed port) 1))
599 (define (setenv name value)
601 (putenv (string-append name "=" value))
604 (define (unsetenv name)
605 "Remove the entry for NAME from the environment."
612 ;;; Here for backward compatability
614 (define scheme-file-suffix (lambda () ".scm"))
616 (define (in-vicinity vicinity file)
617 (let ((tail (let ((len (string-length vicinity)))
620 (string-ref vicinity (- len 1))))))
621 (string-append vicinity
629 ;;; {Help for scm_shell}
630 ;;; The argument-processing code used by Guile-based shells generates
631 ;;; Scheme code based on the argument list. This page contains help
632 ;;; functions for the code it generates.
634 (define (command-line) (program-arguments))
636 ;; This is mostly for the internal use of the code generated by
637 ;; scm_compile_shell_switches.
639 (define (turn-on-debugging)
640 (debug-enable 'debug)
641 (debug-enable 'backtrace)
642 (read-enable 'positions))
644 (define (load-user-init)
645 (let* ((home (or (getenv "HOME")
646 (false-if-exception (passwd:dir (getpwuid (getuid))))
647 "/")) ;; fallback for cygwin etc.
648 (init-file (in-vicinity home ".guile")))
649 (if (file-exists? init-file)
650 (primitive-load init-file))))
653 ;;; {Loading by paths}
655 ;;; Load a Scheme source file named NAME, searching for it in the
656 ;;; directories listed in %load-path, and applying each of the file
657 ;;; name extensions listed in %load-extensions.
658 (define (load-from-path name)
659 (start-stack 'load-stack
660 (primitive-load-path name)))
664 ;;; {Transcendental Functions}
666 ;;; Derived from "Transcen.scm", Complex trancendental functions for SCM.
667 ;;; Written by Jerry D. Hedden, (C) FSF.
668 ;;; See the file `COPYING' for terms applying to this program.
672 (if (real? z) ($exp z)
673 (make-polar ($exp (real-part z)) (imag-part z))))
676 (if (and (real? z) (>= z 0))
678 (make-rectangular ($log (magnitude z)) (angle z))))
682 (if (negative? z) (make-rectangular 0 ($sqrt (- z)))
684 (make-polar ($sqrt (magnitude z)) (/ (angle z) 2))))
687 (let ((integer-expt integer-expt))
692 (/ 1 (integer-expt z1 (- z2)))))
693 ((and (real? z2) (real? z1) (>= z1 0))
696 (exp (* z2 (log z1))))))))
699 (if (real? z) ($sinh z)
700 (let ((x (real-part z)) (y (imag-part z)))
701 (make-rectangular (* ($sinh x) ($cos y))
702 (* ($cosh x) ($sin y))))))
704 (if (real? z) ($cosh z)
705 (let ((x (real-part z)) (y (imag-part z)))
706 (make-rectangular (* ($cosh x) ($cos y))
707 (* ($sinh x) ($sin y))))))
709 (if (real? z) ($tanh z)
710 (let* ((x (* 2 (real-part z)))
711 (y (* 2 (imag-part z)))
712 (w (+ ($cosh x) ($cos y))))
713 (make-rectangular (/ ($sinh x) w) (/ ($sin y) w)))))
716 (if (real? z) ($asinh z)
717 (log (+ z (sqrt (+ (* z z) 1))))))
720 (if (and (real? z) (>= z 1))
722 (log (+ z (sqrt (- (* z z) 1))))))
725 (if (and (real? z) (> z -1) (< z 1))
727 (/ (log (/ (+ 1 z) (- 1 z))) 2)))
730 (if (real? z) ($sin z)
731 (let ((x (real-part z)) (y (imag-part z)))
732 (make-rectangular (* ($sin x) ($cosh y))
733 (* ($cos x) ($sinh y))))))
735 (if (real? z) ($cos z)
736 (let ((x (real-part z)) (y (imag-part z)))
737 (make-rectangular (* ($cos x) ($cosh y))
738 (- (* ($sin x) ($sinh y)))))))
740 (if (real? z) ($tan z)
741 (let* ((x (* 2 (real-part z)))
742 (y (* 2 (imag-part z)))
743 (w (+ ($cos x) ($cosh y))))
744 (make-rectangular (/ ($sin x) w) (/ ($sinh y) w)))))
747 (if (and (real? z) (>= z -1) (<= z 1))
749 (* -i (asinh (* +i z)))))
752 (if (and (real? z) (>= z -1) (<= z 1))
754 (+ (/ (angle -1) 2) (* +i (asinh (* +i z))))))
758 (if (real? z) ($atan z)
759 (/ (log (/ (- +i z) (+ +i z))) +2i))
763 (/ (log arg) (log 10)))
767 ;;; {Reader Extensions}
770 ;;; Reader code for various "#c" forms.
773 (read-hash-extend #\' (lambda (c port)
776 (define read-eval? (make-fluid))
777 (fluid-set! read-eval? #f)
778 (read-hash-extend #\.
780 (if (fluid-ref read-eval?)
781 (eval (read port) (interaction-environment))
783 "#. read expansion found and read-eval? is #f."))))
786 ;;; {Command Line Options}
789 (define (get-option argv kw-opts kw-args return)
794 ((or (not (eq? #\- (string-ref (car argv) 0)))
795 (eq? (string-length (car argv)) 1))
796 (return 'normal-arg (car argv) (cdr argv)))
798 ((eq? #\- (string-ref (car argv) 1))
799 (let* ((kw-arg-pos (or (string-index (car argv) #\=)
800 (string-length (car argv))))
801 (kw (symbol->keyword (substring (car argv) 2 kw-arg-pos)))
802 (kw-opt? (member kw kw-opts))
803 (kw-arg? (member kw kw-args))
804 (arg (or (and (not (eq? kw-arg-pos (string-length (car argv))))
805 (substring (car argv)
807 (string-length (car argv))))
809 (begin (set! argv (cdr argv)) (car argv))))))
810 (if (or kw-opt? kw-arg?)
811 (return kw arg (cdr argv))
812 (return 'usage-error kw (cdr argv)))))
815 (let* ((char (substring (car argv) 1 2))
816 (kw (symbol->keyword char)))
820 (let* ((rest-car (substring (car argv) 2 (string-length (car argv))))
821 (new-argv (if (= 0 (string-length rest-car))
823 (cons (string-append "-" rest-car) (cdr argv)))))
824 (return kw #f new-argv)))
827 (let* ((rest-car (substring (car argv) 2 (string-length (car argv))))
828 (arg (if (= 0 (string-length rest-car))
831 (new-argv (if (= 0 (string-length rest-car))
834 (return kw arg new-argv)))
836 (else (return 'usage-error kw argv)))))))
838 (define (for-next-option proc argv kw-opts kw-args)
839 (let loop ((argv argv))
840 (get-option argv kw-opts kw-args
841 (lambda (opt opt-arg argv)
842 (and opt (proc opt opt-arg argv loop))))))
844 (define (display-usage-report kw-desc)
847 (or (eq? (car kw) #t)
850 (help (cadr opt-desc))
851 (opts (car opt-desc))
852 (opts-proper (if (string? (car opts)) (cdr opts) opts))
853 (arg-name (if (string? (car opts))
854 (string-append "<" (car opts) ">")
856 (left-part (string-append
857 (with-output-to-string
859 (map (lambda (x) (display (keyword-symbol x)) (display " "))
862 (middle-part (if (and (< (string-length left-part) 30)
863 (< (string-length help) 40))
864 (make-string (- 30 (string-length left-part)) #\ )
867 (display middle-part)
874 (define (transform-usage-lambda cases)
875 (let* ((raw-usage (delq! 'else (map car cases)))
876 (usage-sans-specials (map (lambda (x)
877 (or (and (not (list? x)) x)
878 (and (symbol? (car x)) #t)
879 (and (boolean? (car x)) #t)
882 (usage-desc (delq! #t usage-sans-specials))
883 (kw-desc (map car usage-desc))
884 (kw-opts (apply append (map (lambda (x) (and (not (string? (car x))) x)) kw-desc)))
885 (kw-args (apply append (map (lambda (x) (and (string? (car x)) (cdr x))) kw-desc)))
886 (transmogrified-cases (map (lambda (case)
887 (cons (let ((opts (car case)))
888 (if (or (boolean? opts) (eq? 'else opts))
891 ((symbol? (car opts)) opts)
892 ((boolean? (car opts)) opts)
893 ((string? (caar opts)) (cdar opts))
897 `(let ((%display-usage (lambda () (display-usage-report ',usage-desc))))
899 (let %next-arg ((%argv %argv))
903 (lambda (%opt %arg %new-argv)
905 ,@ transmogrified-cases))))))))
910 ;;; {Low Level Modules}
912 ;;; These are the low level data structures for modules.
914 ;;; !!! warning: The interface to lazy binder procedures is going
915 ;;; to be changed in an incompatible way to permit all the basic
916 ;;; module ops to be virtualized.
918 ;;; (make-module size use-list lazy-binding-proc) => module
919 ;;; module-{obarray,uses,binder}[|-set!]
920 ;;; (module? obj) => [#t|#f]
921 ;;; (module-locally-bound? module symbol) => [#t|#f]
922 ;;; (module-bound? module symbol) => [#t|#f]
923 ;;; (module-symbol-locally-interned? module symbol) => [#t|#f]
924 ;;; (module-symbol-interned? module symbol) => [#t|#f]
925 ;;; (module-local-variable module symbol) => [#<variable ...> | #f]
926 ;;; (module-variable module symbol) => [#<variable ...> | #f]
927 ;;; (module-symbol-binding module symbol opt-value)
928 ;;; => [ <obj> | opt-value | an error occurs ]
929 ;;; (module-make-local-var! module symbol) => #<variable...>
930 ;;; (module-add! module symbol var) => unspecified
931 ;;; (module-remove! module symbol) => unspecified
932 ;;; (module-for-each proc module) => unspecified
933 ;;; (make-scm-module) => module ; a lazy copy of the symhash module
934 ;;; (set-current-module module) => unspecified
935 ;;; (current-module) => #<module...>
940 ;;; {Printing Modules}
941 ;; This is how modules are printed. You can re-define it.
942 ;; (Redefining is actually more complicated than simply redefining
943 ;; %print-module because that would only change the binding and not
944 ;; the value stored in the vtable that determines how record are
947 (define (%print-module mod port) ; unused args: depth length style table)
949 (display (or (module-kind mod) "module") port)
950 (let ((name (module-name mod)))
954 (display name port))))
956 (display (number->string (object-address mod) 16) port)
961 ;; A module is characterized by an obarray in which local symbols
962 ;; are interned, a list of modules, "uses", from which non-local
963 ;; bindings can be inherited, and an optional lazy-binder which
964 ;; is a (CLOSURE module symbol) which, as a last resort, can provide
965 ;; bindings that would otherwise not be found locally in the module.
967 ;; NOTE: If you change here, you also need to change libguile/modules.h.
970 (make-record-type 'module
971 '(obarray uses binder eval-closure transformer name kind
972 observers weak-observers observer-id)
975 ;; make-module &opt size uses binder
977 ;; Create a new module, perhaps with a particular size of obarray,
978 ;; initial uses list, or binding procedure.
983 (define (parse-arg index default)
984 (if (> (length args) index)
985 (list-ref args index)
988 (if (> (length args) 3)
989 (error "Too many args to make-module." args))
991 (let ((size (parse-arg 0 1021))
992 (uses (parse-arg 1 '()))
993 (binder (parse-arg 2 #f)))
995 (if (not (integer? size))
996 (error "Illegal size to make-module." size))
997 (if (not (and (list? uses)
998 (and-map module? uses)))
999 (error "Incorrect use list." uses))
1000 (if (and binder (not (procedure? binder)))
1002 "Lazy-binder expected to be a procedure or #f." binder))
1004 (let ((module (module-constructor (make-vector size '())
1005 uses binder #f #f #f #f
1007 (make-weak-value-hash-table 31)
1010 ;; We can't pass this as an argument to module-constructor,
1011 ;; because we need it to close over a pointer to the module
1013 (set-module-eval-closure! module (standard-eval-closure module))
1017 (define module-constructor (record-constructor module-type))
1018 (define module-obarray (record-accessor module-type 'obarray))
1019 (define set-module-obarray! (record-modifier module-type 'obarray))
1020 (define module-uses (record-accessor module-type 'uses))
1021 (define set-module-uses! (record-modifier module-type 'uses))
1022 (define module-binder (record-accessor module-type 'binder))
1023 (define set-module-binder! (record-modifier module-type 'binder))
1025 ;; NOTE: This binding is used in libguile/modules.c.
1026 (define module-eval-closure (record-accessor module-type 'eval-closure))
1028 (define module-transformer (record-accessor module-type 'transformer))
1029 (define set-module-transformer! (record-modifier module-type 'transformer))
1030 (define module-name (record-accessor module-type 'name))
1031 (define set-module-name! (record-modifier module-type 'name))
1032 (define module-kind (record-accessor module-type 'kind))
1033 (define set-module-kind! (record-modifier module-type 'kind))
1034 (define module-observers (record-accessor module-type 'observers))
1035 (define set-module-observers! (record-modifier module-type 'observers))
1036 (define module-weak-observers (record-accessor module-type 'weak-observers))
1037 (define module-observer-id (record-accessor module-type 'observer-id))
1038 (define set-module-observer-id! (record-modifier module-type 'observer-id))
1039 (define module? (record-predicate module-type))
1041 (define set-module-eval-closure!
1042 (let ((setter (record-modifier module-type 'eval-closure)))
1043 (lambda (module closure)
1044 (setter module closure)
1045 ;; Make it possible to lookup the module from the environment.
1046 ;; This implementation is correct since an eval closure can belong
1047 ;; to maximally one module.
1048 (set-procedure-property! closure 'module module))))
1051 ;;; {Observer protocol}
1054 (define (module-observe module proc)
1055 (set-module-observers! module (cons proc (module-observers module)))
1058 (define (module-observe-weak module proc)
1059 (let ((id (module-observer-id module)))
1060 (hash-set! (module-weak-observers module) id proc)
1061 (set-module-observer-id! module (+ 1 id))
1064 (define (module-unobserve token)
1065 (let ((module (car token))
1068 (hash-remove! (module-weak-observers module) id)
1069 (set-module-observers! module (delq1! id (module-observers module)))))
1072 (define (module-modified m)
1073 (for-each (lambda (proc) (proc m)) (module-observers m))
1074 (hash-fold (lambda (id proc res) (proc m)) #f (module-weak-observers m)))
1077 ;;; {Module Searching in General}
1079 ;;; We sometimes want to look for properties of a symbol
1080 ;;; just within the obarray of one module. If the property
1081 ;;; holds, then it is said to hold ``locally'' as in, ``The symbol
1082 ;;; DISPLAY is locally rebound in the module `safe-guile'.''
1085 ;;; Other times, we want to test for a symbol property in the obarray
1086 ;;; of M and, if it is not found there, try each of the modules in the
1087 ;;; uses list of M. This is the normal way of testing for some
1088 ;;; property, so we state these properties without qualification as
1089 ;;; in: ``The symbol 'fnord is interned in module M because it is
1090 ;;; interned locally in module M2 which is a member of the uses list
1094 ;; module-search fn m
1096 ;; return the first non-#f result of FN applied to M and then to
1097 ;; the modules in the uses of m, and so on recursively. If all applications
1098 ;; return #f, then so does this function.
1100 (define (module-search fn m v)
1103 (or (module-search fn (car pos) v)
1106 (loop (module-uses m))))
1109 ;;; {Is a symbol bound in a module?}
1111 ;;; Symbol S in Module M is bound if S is interned in M and if the binding
1112 ;;; of S in M has been set to some well-defined value.
1115 ;; module-locally-bound? module symbol
1117 ;; Is a symbol bound (interned and defined) locally in a given module?
1119 (define (module-locally-bound? m v)
1120 (let ((var (module-local-variable m v)))
1122 (variable-bound? var))))
1124 ;; module-bound? module symbol
1126 ;; Is a symbol bound (interned and defined) anywhere in a given module
1129 (define (module-bound? m v)
1130 (module-search module-locally-bound? m v))
1132 ;;; {Is a symbol interned in a module?}
1134 ;;; Symbol S in Module M is interned if S occurs in
1135 ;;; of S in M has been set to some well-defined value.
1137 ;;; It is possible to intern a symbol in a module without providing
1138 ;;; an initial binding for the corresponding variable. This is done
1140 ;;; (module-add! module symbol (make-undefined-variable))
1142 ;;; In that case, the symbol is interned in the module, but not
1143 ;;; bound there. The unbound symbol shadows any binding for that
1144 ;;; symbol that might otherwise be inherited from a member of the uses list.
1147 (define (module-obarray-get-handle ob key)
1148 ((if (symbol? key) hashq-get-handle hash-get-handle) ob key))
1150 (define (module-obarray-ref ob key)
1151 ((if (symbol? key) hashq-ref hash-ref) ob key))
1153 (define (module-obarray-set! ob key val)
1154 ((if (symbol? key) hashq-set! hash-set!) ob key val))
1156 (define (module-obarray-remove! ob key)
1157 ((if (symbol? key) hashq-remove! hash-remove!) ob key))
1159 ;; module-symbol-locally-interned? module symbol
1161 ;; is a symbol interned (not neccessarily defined) locally in a given module
1162 ;; or its uses? Interned symbols shadow inherited bindings even if
1163 ;; they are not themselves bound to a defined value.
1165 (define (module-symbol-locally-interned? m v)
1166 (not (not (module-obarray-get-handle (module-obarray m) v))))
1168 ;; module-symbol-interned? module symbol
1170 ;; is a symbol interned (not neccessarily defined) anywhere in a given module
1171 ;; or its uses? Interned symbols shadow inherited bindings even if
1172 ;; they are not themselves bound to a defined value.
1174 (define (module-symbol-interned? m v)
1175 (module-search module-symbol-locally-interned? m v))
1178 ;;; {Mapping modules x symbols --> variables}
1181 ;; module-local-variable module symbol
1182 ;; return the local variable associated with a MODULE and SYMBOL.
1184 ;;; This function is very important. It is the only function that can
1185 ;;; return a variable from a module other than the mutators that store
1186 ;;; new variables in modules. Therefore, this function is the location
1187 ;;; of the "lazy binder" hack.
1189 ;;; If symbol is defined in MODULE, and if the definition binds symbol
1190 ;;; to a variable, return that variable object.
1192 ;;; If the symbols is not found at first, but the module has a lazy binder,
1193 ;;; then try the binder.
1195 ;;; If the symbol is not found at all, return #f.
1197 (define (module-local-variable m v)
1200 (let ((b (module-obarray-ref (module-obarray m) v)))
1201 (or (and (variable? b) b)
1202 (and (module-binder m)
1203 ((module-binder m) m v #f)))))
1206 ;; module-variable module symbol
1208 ;; like module-local-variable, except search the uses in the
1209 ;; case V is not found in M.
1211 ;; NOTE: This function is superseded with C code (see modules.c)
1212 ;;; when using the standard eval closure.
1214 (define (module-variable m v)
1215 (module-search module-local-variable m v))
1218 ;;; {Mapping modules x symbols --> bindings}
1220 ;;; These are similar to the mapping to variables, except that the
1221 ;;; variable is dereferenced.
1224 ;; module-symbol-binding module symbol opt-value
1226 ;; return the binding of a variable specified by name within
1227 ;; a given module, signalling an error if the variable is unbound.
1228 ;; If the OPT-VALUE is passed, then instead of signalling an error,
1229 ;; return OPT-VALUE.
1231 (define (module-symbol-local-binding m v . opt-val)
1232 (let ((var (module-local-variable m v)))
1235 (if (not (null? opt-val))
1237 (error "Locally unbound variable." v)))))
1239 ;; module-symbol-binding module symbol opt-value
1241 ;; return the binding of a variable specified by name within
1242 ;; a given module, signalling an error if the variable is unbound.
1243 ;; If the OPT-VALUE is passed, then instead of signalling an error,
1244 ;; return OPT-VALUE.
1246 (define (module-symbol-binding m v . opt-val)
1247 (let ((var (module-variable m v)))
1250 (if (not (null? opt-val))
1252 (error "Unbound variable." v)))))
1256 ;;; {Adding Variables to Modules}
1261 ;; module-make-local-var! module symbol
1263 ;; ensure a variable for V in the local namespace of M.
1264 ;; If no variable was already there, then create a new and uninitialzied
1267 (define (module-make-local-var! m v)
1268 (or (let ((b (module-obarray-ref (module-obarray m) v)))
1273 (and (module-binder m)
1274 ((module-binder m) m v #t))
1276 (let ((answer (make-undefined-variable)))
1277 (module-obarray-set! (module-obarray m) v answer)
1281 ;; module-ensure-local-variable! module symbol
1283 ;; Ensure that there is a local variable in MODULE for SYMBOL. If
1284 ;; there is no binding for SYMBOL, create a new uninitialized
1285 ;; variable. Return the local variable.
1287 (define (module-ensure-local-variable! module symbol)
1288 (or (module-local-variable module symbol)
1289 (let ((var (make-undefined-variable)))
1290 (module-add! module symbol var)
1293 ;; module-add! module symbol var
1295 ;; ensure a particular variable for V in the local namespace of M.
1297 (define (module-add! m v var)
1298 (if (not (variable? var))
1299 (error "Bad variable to module-add!" var))
1300 (module-obarray-set! (module-obarray m) v var)
1301 (module-modified m))
1305 ;; make sure that a symbol is undefined in the local namespace of M.
1307 (define (module-remove! m v)
1308 (module-obarray-remove! (module-obarray m) v)
1309 (module-modified m))
1311 (define (module-clear! m)
1312 (vector-fill! (module-obarray m) '())
1313 (module-modified m))
1315 ;; MODULE-FOR-EACH -- exported
1317 ;; Call PROC on each symbol in MODULE, with arguments of (SYMBOL VARIABLE).
1319 (define (module-for-each proc module)
1320 (let ((obarray (module-obarray module)))
1321 (do ((index 0 (+ index 1))
1322 (end (vector-length obarray)))
1326 (proc (car bucket) (cdr bucket)))
1327 (vector-ref obarray index)))))
1330 (define (module-map proc module)
1331 (let* ((obarray (module-obarray module))
1332 (end (vector-length obarray)))
1340 (map (lambda (bucket)
1341 (proc (car bucket) (cdr bucket)))
1342 (vector-ref obarray i))
1346 ;;; {Low Level Bootstrapping}
1351 ;; A root module uses the pre-modules-obarray as its obarray. This
1352 ;; special obarray accumulates all bindings that have been established
1353 ;; before the module system is fully booted.
1355 ;; (The obarray continues to be used by code that has been closed over
1356 ;; before the module system has been booted.)
1358 (define (make-root-module)
1359 (let ((m (make-module 0)))
1360 (set-module-obarray! m (%get-pre-modules-obarray))
1365 ;; The root interface is a module that uses the same obarray as the
1366 ;; root module. It does not allow new definitions, tho.
1368 (define (make-scm-module)
1369 (let ((m (make-module 0)))
1370 (set-module-obarray! m (%get-pre-modules-obarray))
1371 (set-module-eval-closure! m (standard-interface-eval-closure m))
1376 ;;; {Module-based Loading}
1379 (define (save-module-excursion thunk)
1380 (let ((inner-module (current-module))
1382 (dynamic-wind (lambda ()
1383 (set! outer-module (current-module))
1384 (set-current-module inner-module)
1385 (set! inner-module #f))
1388 (set! inner-module (current-module))
1389 (set-current-module outer-module)
1390 (set! outer-module #f)))))
1392 (define basic-load load)
1394 (define (load-module filename)
1395 (save-module-excursion
1397 (let ((oldname (and (current-load-port)
1398 (port-filename (current-load-port)))))
1399 (basic-load (if (and oldname
1400 (> (string-length filename) 0)
1401 (not (char=? (string-ref filename 0) #\/))
1402 (not (string=? (dirname oldname) ".")))
1403 (string-append (dirname oldname) "/" filename)
1408 ;;; {MODULE-REF -- exported}
1410 ;; Returns the value of a variable called NAME in MODULE or any of its
1411 ;; used modules. If there is no such variable, then if the optional third
1412 ;; argument DEFAULT is present, it is returned; otherwise an error is signaled.
1414 (define (module-ref module name . rest)
1415 (let ((variable (module-variable module name)))
1416 (if (and variable (variable-bound? variable))
1417 (variable-ref variable)
1419 (error "No variable named" name 'in module)
1420 (car rest) ; default value
1423 ;; MODULE-SET! -- exported
1425 ;; Sets the variable called NAME in MODULE (or in a module that MODULE uses)
1426 ;; to VALUE; if there is no such variable, an error is signaled.
1428 (define (module-set! module name value)
1429 (let ((variable (module-variable module name)))
1431 (variable-set! variable value)
1432 (error "No variable named" name 'in module))))
1434 ;; MODULE-DEFINE! -- exported
1436 ;; Sets the variable called NAME in MODULE to VALUE; if there is no such
1437 ;; variable, it is added first.
1439 (define (module-define! module name value)
1440 (let ((variable (module-local-variable module name)))
1443 (variable-set! variable value)
1444 (module-modified module))
1445 (let ((variable (make-variable value)))
1446 (module-add! module name variable)))))
1448 ;; MODULE-DEFINED? -- exported
1450 ;; Return #t iff NAME is defined in MODULE (or in a module that MODULE
1453 (define (module-defined? module name)
1454 (let ((variable (module-variable module name)))
1455 (and variable (variable-bound? variable))))
1457 ;; MODULE-USE! module interface
1459 ;; Add INTERFACE to the list of interfaces used by MODULE.
1461 (define (module-use! module interface)
1462 (set-module-uses! module
1463 (cons interface (delq! interface (module-uses module))))
1464 (module-modified module))
1467 ;;; {Recursive Namespaces}
1470 ;;; A hierarchical namespace emerges if we consider some module to be
1471 ;;; root, and variables bound to modules as nested namespaces.
1473 ;;; The routines in this file manage variable names in hierarchical namespace.
1474 ;;; Each variable name is a list of elements, looked up in successively nested
1477 ;;; (nested-ref some-root-module '(foo bar baz))
1478 ;;; => <value of a variable named baz in the module bound to bar in
1479 ;;; the module bound to foo in some-root-module>
1484 ;;; ;; a-root is a module
1485 ;;; ;; name is a list of symbols
1487 ;;; nested-ref a-root name
1488 ;;; nested-set! a-root name val
1489 ;;; nested-define! a-root name val
1490 ;;; nested-remove! a-root name
1493 ;;; (current-module) is a natural choice for a-root so for convenience there are
1496 ;;; local-ref name == nested-ref (current-module) name
1497 ;;; local-set! name val == nested-set! (current-module) name val
1498 ;;; local-define! name val == nested-define! (current-module) name val
1499 ;;; local-remove! name == nested-remove! (current-module) name
1503 (define (nested-ref root names)
1504 (let loop ((cur root)
1508 ((not (module? cur)) #f)
1509 (else (loop (module-ref cur (car elts) #f) (cdr elts))))))
1511 (define (nested-set! root names val)
1512 (let loop ((cur root)
1514 (if (null? (cdr elts))
1515 (module-set! cur (car elts) val)
1516 (loop (module-ref cur (car elts)) (cdr elts)))))
1518 (define (nested-define! root names val)
1519 (let loop ((cur root)
1521 (if (null? (cdr elts))
1522 (module-define! cur (car elts) val)
1523 (loop (module-ref cur (car elts)) (cdr elts)))))
1525 (define (nested-remove! root names)
1526 (let loop ((cur root)
1528 (if (null? (cdr elts))
1529 (module-remove! cur (car elts))
1530 (loop (module-ref cur (car elts)) (cdr elts)))))
1532 (define (local-ref names) (nested-ref (current-module) names))
1533 (define (local-set! names val) (nested-set! (current-module) names val))
1534 (define (local-define names val) (nested-define! (current-module) names val))
1535 (define (local-remove names) (nested-remove! (current-module) names))
1539 ;;; {The (app) module}
1541 ;;; The root of conventionally named objects not directly in the top level.
1544 ;;; (app modules guile)
1546 ;;; The directory of all modules and the standard root module.
1549 (define (module-public-interface m)
1550 (module-ref m '%module-public-interface #f))
1551 (define (set-module-public-interface! m i)
1552 (module-define! m '%module-public-interface i))
1553 (define (set-system-module! m s)
1554 (set-procedure-property! (module-eval-closure m) 'system-module s))
1555 (define the-root-module (make-root-module))
1556 (define the-scm-module (make-scm-module))
1557 (set-module-public-interface! the-root-module the-scm-module)
1558 (set-module-name! the-root-module '(guile))
1559 (set-module-name! the-scm-module '(guile))
1560 (set-module-kind! the-scm-module 'interface)
1561 (for-each set-system-module! (list the-root-module the-scm-module) '(#t #t))
1563 ;; NOTE: This binding is used in libguile/modules.c.
1565 (define (make-modules-in module name)
1569 ((module-ref module (car name) #f)
1570 => (lambda (m) (make-modules-in m (cdr name))))
1571 (else (let ((m (make-module 31)))
1572 (set-module-kind! m 'directory)
1573 (set-module-name! m (append (or (module-name module)
1576 (module-define! module (car name) m)
1577 (make-modules-in m (cdr name)))))))
1579 (define (beautify-user-module! module)
1580 (let ((interface (module-public-interface module)))
1581 (if (or (not interface)
1582 (eq? interface module))
1583 (let ((interface (make-module 31)))
1584 (set-module-name! interface (module-name module))
1585 (set-module-kind! interface 'interface)
1586 (set-module-public-interface! module interface))))
1587 (if (and (not (memq the-scm-module (module-uses module)))
1588 (not (eq? module the-root-module)))
1589 (set-module-uses! module (append (module-uses module) (list the-scm-module)))))
1591 ;; NOTE: This binding is used in libguile/modules.c.
1593 (define (resolve-module name . maybe-autoload)
1594 (let ((full-name (append '(app modules) name)))
1595 (let ((already (local-ref full-name)))
1597 ;; The module already exists...
1598 (if (and (or (null? maybe-autoload) (car maybe-autoload))
1599 (not (module-public-interface already)))
1600 ;; ...but we are told to load and it doesn't contain source, so
1602 (try-load-module name)
1604 ;; simply return it.
1607 ;; Try to autoload it if we are told so
1608 (if (or (null? maybe-autoload) (car maybe-autoload))
1609 (try-load-module name))
1611 (make-modules-in (current-module) full-name))))))
1613 ;; Cheat. These bindings are needed by modules.c, but we don't want
1614 ;; to move their real definition here because that would be unnatural.
1616 (define try-module-autoload #f)
1617 (define process-define-module #f)
1618 (define process-use-modules #f)
1619 (define module-export! #f)
1621 ;; This boots the module system. All bindings needed by modules.c
1622 ;; must have been defined by now.
1624 (set-current-module the-root-module)
1626 (define app (make-module 31))
1627 (local-define '(app modules) (make-module 31))
1628 (local-define '(app modules guile) the-root-module)
1630 ;; (define-special-value '(app modules new-ws) (lambda () (make-scm-module)))
1632 (define (try-load-module name)
1633 (try-module-autoload name))
1635 (define (purify-module! module)
1636 "Removes bindings in MODULE which are inherited from the (guile) module."
1637 (let ((use-list (module-uses module)))
1638 (if (and (pair? use-list)
1639 (eq? (car (last-pair use-list)) the-scm-module))
1640 (set-module-uses! module (reverse (cdr (reverse use-list)))))))
1642 ;; Return a module that is an interface to the module designated by
1645 ;; `resolve-interface' takes two keyword arguments:
1647 ;; #:select SELECTION
1649 ;; SELECTION is a list of binding-specs to be imported; A binding-spec
1650 ;; is either a symbol or a pair of symbols (ORIG . SEEN), where ORIG
1651 ;; is the name in the used module and SEEN is the name in the using
1652 ;; module. Note that SEEN is also passed through RENAMER, below. The
1653 ;; default is to select all bindings. If you specify no selection but
1654 ;; a renamer, only the bindings that already exist in the used module
1655 ;; are made available in the interface. Bindings that are added later
1656 ;; are not picked up.
1658 ;; #:renamer RENAMER
1660 ;; RENAMER is a procedure that takes a symbol and returns its new
1661 ;; name. The default is to not perform any renaming.
1663 ;; Signal "no code for module" error if module name is not resolvable
1664 ;; or its public interface is not available. Signal "no binding"
1665 ;; error if selected binding does not exist in the used module.
1667 (define (resolve-interface name . args)
1669 (define (get-keyword-arg args kw def)
1670 (cond ((memq kw args)
1672 (if (null? (cdr kw-arg))
1673 (error "keyword without value: " kw))
1678 (let* ((select (get-keyword-arg args #:select #f))
1679 (renamer (get-keyword-arg args #:renamer identity))
1680 (module (resolve-module name))
1681 (public-i (and module (module-public-interface module))))
1682 (and (or (not module) (not public-i))
1683 (error "no code for module" name))
1684 (if (and (not select) (eq? renamer identity))
1686 (let ((selection (or select (module-map (lambda (sym var) sym)
1688 (custom-i (make-module 31)))
1689 (set-module-kind! custom-i 'interface)
1690 ;; XXX - should use a lazy binder so that changes to the
1691 ;; used module are picked up automatically.
1692 (for-each (lambda (bspec)
1693 (let* ((direct? (symbol? bspec))
1694 (orig (if direct? bspec (car bspec)))
1695 (seen (if direct? bspec (cdr bspec))))
1696 (module-add! custom-i (renamer seen)
1697 (or (module-local-variable public-i orig)
1698 (module-local-variable module orig)
1700 ;; fixme: format manually for now
1702 #f "no binding `~A' in module ~A"
1707 (define (symbol-prefix-proc prefix)
1709 (symbol-append prefix symbol)))
1711 ;; This function is called from "modules.c". If you change it, be
1712 ;; sure to update "modules.c" as well.
1714 (define (process-define-module args)
1715 (let* ((module-id (car args))
1716 (module (resolve-module module-id #f))
1718 (unrecognized (lambda (arg)
1719 (error "unrecognized define-module argument" arg))))
1720 (beautify-user-module! module)
1721 (let loop ((kws kws)
1722 (reversed-interfaces '())
1727 (for-each (lambda (interface)
1728 (module-use! module interface))
1729 (reverse reversed-interfaces))
1730 (module-export! module exports)
1731 (module-re-export! module re-exports))
1733 ((#:use-module #:use-syntax)
1734 (or (pair? (cdr kws))
1736 (let* ((interface-args (cadr kws))
1737 (interface (apply resolve-interface interface-args)))
1738 (and (eq? (car kws) #:use-syntax)
1739 (or (symbol? (caar interface-args))
1740 (error "invalid module name for use-syntax"
1741 (car interface-args)))
1742 (set-module-transformer!
1744 (module-ref interface
1745 (car (last-pair (car interface-args)))
1748 (cons interface reversed-interfaces)
1752 (or (and (pair? (cdr kws)) (pair? (cddr kws)))
1755 (cons (make-autoload-interface module
1758 reversed-interfaces)
1762 (set-system-module! module #t)
1763 (loop (cdr kws) reversed-interfaces exports re-exports))
1765 (purify-module! module)
1766 (loop (cdr kws) reversed-interfaces exports re-exports))
1767 ((#:export #:export-syntax)
1768 (or (pair? (cdr kws))
1772 (append (cadr kws) exports)
1774 ((#:re-export #:re-export-syntax)
1775 (or (pair? (cdr kws))
1780 (append (cadr kws) re-exports)))
1782 (unrecognized kws)))))
1787 (define (make-autoload-interface module name bindings)
1788 (let ((b (lambda (a sym definep)
1789 (and (memq sym bindings)
1790 (let ((i (module-public-interface (resolve-module name))))
1792 (error "missing interface for module" name))
1793 ;; Replace autoload-interface with interface
1794 (set-car! (memq a (module-uses module)) i)
1795 (module-local-variable i sym))))))
1796 (module-constructor #() '() b #f #f name 'autoload
1797 '() (make-weak-value-hash-table 31) 0)))
1799 ;;; {Compiled module}
1801 (define load-compiled #f)
1804 ;;; {Autoloading modules}
1806 (define autoloads-in-progress '())
1808 ;; This function is called from "modules.c". If you change it, be
1809 ;; sure to update "modules.c" as well.
1811 (define (try-module-autoload module-name)
1812 (let* ((reverse-name (reverse module-name))
1813 (name (symbol->string (car reverse-name)))
1814 (dir-hint-module-name (reverse (cdr reverse-name)))
1815 (dir-hint (apply string-append
1817 (string-append (symbol->string elt) "/"))
1818 dir-hint-module-name))))
1819 (resolve-module dir-hint-module-name #f)
1820 (and (not (autoload-done-or-in-progress? dir-hint name))
1822 (define (load-file proc file)
1823 (save-module-excursion (lambda () (proc file)))
1826 (lambda () (autoload-in-progress! dir-hint name))
1828 (let ((file (in-vicinity dir-hint name)))
1829 (cond ((and load-compiled
1830 (%search-load-path (string-append file ".go")))
1832 (load-file load-compiled full)))
1833 ((%search-load-path file)
1835 (load-file primitive-load full))))))
1836 (lambda () (set-autoloaded! dir-hint name didit)))
1840 ;;; Dynamic linking of modules
1842 (define autoloads-done '((guile . guile)))
1844 (define (autoload-done-or-in-progress? p m)
1845 (let ((n (cons p m)))
1846 (->bool (or (member n autoloads-done)
1847 (member n autoloads-in-progress)))))
1849 (define (autoload-done! p m)
1850 (let ((n (cons p m)))
1851 (set! autoloads-in-progress
1852 (delete! n autoloads-in-progress))
1853 (or (member n autoloads-done)
1854 (set! autoloads-done (cons n autoloads-done)))))
1856 (define (autoload-in-progress! p m)
1857 (let ((n (cons p m)))
1858 (set! autoloads-done
1859 (delete! n autoloads-done))
1860 (set! autoloads-in-progress (cons n autoloads-in-progress))))
1862 (define (set-autoloaded! p m done?)
1864 (autoload-done! p m)
1865 (let ((n (cons p m)))
1866 (set! autoloads-done (delete! n autoloads-done))
1867 (set! autoloads-in-progress (delete! n autoloads-in-progress)))))
1874 ;; (eval-case ((situation*) forms)* (else forms)?)
1876 ;; Evaluate certain code based on the situation that eval-case is used
1877 ;; in. The only defined situation right now is `load-toplevel' which
1878 ;; triggers for code evaluated at the top-level, for example from the
1879 ;; REPL or when loading a file.
1882 (procedure->memoizing-macro
1884 (define (toplevel-env? env)
1885 (or (not (pair? env)) (not (pair? (car env)))))
1887 (error "syntax error in eval-case"))
1888 (let loop ((clauses (cdr exp)))
1892 ((not (list? (car clauses)))
1894 ((eq? 'else (caar clauses))
1895 (or (null? (cdr clauses))
1897 (cons 'begin (cdar clauses)))
1898 ((not (list? (caar clauses)))
1900 ((and (toplevel-env? env)
1901 (memq 'load-toplevel (caar clauses)))
1902 (cons 'begin (cdar clauses)))
1904 (loop (cdr clauses))))))))
1910 (define (primitive-macro? m)
1912 (not (macro-transformer m))))
1916 (define macro-table (make-weak-key-hash-table 523))
1917 (define xformer-table (make-weak-key-hash-table 523))
1919 (define (defmacro? m) (hashq-ref macro-table m))
1920 (define (assert-defmacro?! m) (hashq-set! macro-table m #t))
1921 (define (defmacro-transformer m) (hashq-ref xformer-table m))
1922 (define (set-defmacro-transformer! m t) (hashq-set! xformer-table m t))
1924 (define defmacro:transformer
1926 (let* ((xform (lambda (exp env)
1927 (copy-tree (apply f (cdr exp)))))
1928 (a (procedure->memoizing-macro xform)))
1929 (assert-defmacro?! a)
1930 (set-defmacro-transformer! a f)
1935 (let ((defmacro-transformer
1936 (lambda (name parms . body)
1937 (let ((transformer `(lambda ,parms ,@body)))
1940 (define ,name (defmacro:transformer ,transformer)))
1942 (error "defmacro can only be used at the top level")))))))
1943 (defmacro:transformer defmacro-transformer)))
1945 (define defmacro:syntax-transformer
1949 (copy-tree (apply f (cdr exp)))))))
1952 ;; XXX - should the definition of the car really be looked up in the
1955 (define (macroexpand-1 e)
1957 ((pair? e) (let* ((a (car e))
1958 (val (and (symbol? a) (local-ref (list a)))))
1960 (apply (defmacro-transformer val) (cdr e))
1964 (define (macroexpand e)
1966 ((pair? e) (let* ((a (car e))
1967 (val (and (symbol? a) (local-ref (list a)))))
1969 (macroexpand (apply (defmacro-transformer val) (cdr e)))
1977 ;;; {Run-time options}
1979 (define define-option-interface
1980 (let* ((option-name car)
1982 (option-documentation caddr)
1984 (print-option (lambda (option)
1985 (display (option-name option))
1986 (if (< (string-length
1987 (symbol->string (option-name option)))
1991 (display (option-value option))
1993 (display (option-documentation option))
1996 ;; Below follow the macros defining the run-time option interfaces.
1998 (make-options (lambda (interface)
2000 (cond ((null? args) (,interface))
2002 (,interface (car args)) (,interface))
2003 (else (for-each ,print-option
2004 (,interface #t)))))))
2006 (make-enable (lambda (interface)
2008 (,interface (append flags (,interface)))
2011 (make-disable (lambda (interface)
2013 (let ((options (,interface)))
2014 (for-each (lambda (flag)
2015 (set! options (delq! flag options)))
2017 (,interface options)
2020 (make-set! (lambda (interface)
2023 (begin (,interface (append (,interface)
2024 (list '(,'unquote name)
2030 (let* ((option-group (cadr exp))
2031 (interface (car option-group)))
2032 (append (map (lambda (name constructor)
2034 ,(constructor interface)))
2039 (map (lambda (name constructor)
2041 ,@(constructor interface)))
2042 (caddr option-group)
2043 (list make-set!)))))))))
2045 (define-option-interface
2046 (eval-options-interface
2047 (eval-options eval-enable eval-disable)
2050 (define-option-interface
2051 (debug-options-interface
2052 (debug-options debug-enable debug-disable)
2055 (define-option-interface
2056 (evaluator-traps-interface
2057 (traps trap-enable trap-disable)
2060 (define-option-interface
2061 (read-options-interface
2062 (read-options read-enable read-disable)
2065 (define-option-interface
2066 (print-options-interface
2067 (print-options print-enable print-disable)
2075 (define (repl read evaler print)
2076 (let loop ((source (read (current-input-port))))
2077 (print (evaler source))
2078 (loop (read (current-input-port)))))
2080 ;; A provisional repl that acts like the SCM repl:
2082 (define scm-repl-silent #f)
2083 (define (assert-repl-silence v) (set! scm-repl-silent v))
2085 (define *unspecified* (if #f #f))
2086 (define (unspecified? v) (eq? v *unspecified*))
2088 (define scm-repl-print-unspecified #f)
2089 (define (assert-repl-print-unspecified v) (set! scm-repl-print-unspecified v))
2091 (define scm-repl-verbose #f)
2092 (define (assert-repl-verbosity v) (set! scm-repl-verbose v))
2094 (define scm-repl-prompt "guile> ")
2096 (define (set-repl-prompt! v) (set! scm-repl-prompt v))
2098 (define (default-lazy-handler key . args)
2099 (save-stack lazy-handler-dispatch)
2100 (apply throw key args))
2102 (define (lazy-handler-dispatch key . args)
2103 (apply default-lazy-handler key args))
2105 (define abort-hook (make-hook))
2107 ;; these definitions are used if running a script.
2108 ;; otherwise redefined in error-catching-loop.
2109 (define (set-batch-mode?! arg) #t)
2110 (define (batch-mode?) #t)
2112 (define (error-catching-loop thunk)
2115 (define (loop first)
2123 (lambda () (unmask-signals))
2129 ;; This line is needed because mark
2130 ;; doesn't do closures quite right.
2131 ;; Unreferenced locals should be
2135 (let loop ((v (thunk)))
2138 (lambda () (mask-signals))))
2140 lazy-handler-dispatch))
2142 (lambda (key . args)
2149 (apply throw 'switch-repl args))
2152 ;; This is one of the closures that require
2153 ;; (set! first #f) above
2156 (run-hook abort-hook)
2157 (force-output (current-output-port))
2158 (display "ABORT: " (current-error-port))
2159 (write args (current-error-port))
2160 (newline (current-error-port))
2164 (not has-shown-debugger-hint?)
2165 (not (memq 'backtrace
2166 (debug-options-interface)))
2167 (stack? (fluid-ref the-last-stack)))
2169 (newline (current-error-port))
2171 "Type \"(backtrace)\" to get more information or \"(debug)\" to enter the debugger.\n"
2172 (current-error-port))
2173 (set! has-shown-debugger-hint? #t)))
2174 (force-output (current-error-port)))
2176 (primitive-exit 1)))
2177 (set! stack-saved? #f)))
2180 ;; This is the other cons-leak closure...
2182 (cond ((= (length args) 4)
2183 (apply handle-system-error key args))
2185 (apply bad-throw key args))))))))))
2186 (if next (loop next) status)))
2187 (set! set-batch-mode?! (lambda (arg)
2189 (set! interactive #f)
2192 (error "sorry, not implemented")))))
2193 (set! batch-mode? (lambda () (not interactive)))
2194 (loop (lambda () #t))))
2196 ;;(define the-last-stack (make-fluid)) Defined by scm_init_backtrace ()
2197 (define before-signal-stack (make-fluid))
2198 (define stack-saved? #f)
2200 (define (save-stack . narrowing)
2202 (cond ((not (memq 'debug (debug-options-interface)))
2203 (fluid-set! the-last-stack #f)
2204 (set! stack-saved? #t))
2210 (apply make-stack #t save-stack primitive-eval #t 0 narrowing))
2212 (apply make-stack #t save-stack 0 #t 0 narrowing))
2214 (apply make-stack #t save-stack tk-stack-mark #t 0 narrowing))
2216 (apply make-stack #t save-stack 0 1 narrowing))
2218 (let ((id (stack-id #t)))
2219 (and (procedure? id)
2220 (apply make-stack #t save-stack id #t 0 narrowing))))))
2221 (set! stack-saved? #t)))))
2223 (define before-error-hook (make-hook))
2224 (define after-error-hook (make-hook))
2225 (define before-backtrace-hook (make-hook))
2226 (define after-backtrace-hook (make-hook))
2228 (define has-shown-debugger-hint? #f)
2230 (define (handle-system-error key . args)
2231 (let ((cep (current-error-port)))
2232 (cond ((not (stack? (fluid-ref the-last-stack))))
2233 ((memq 'backtrace (debug-options-interface))
2234 (run-hook before-backtrace-hook)
2236 (display "Backtrace:\n")
2237 (display-backtrace (fluid-ref the-last-stack) cep)
2239 (run-hook after-backtrace-hook)))
2240 (run-hook before-error-hook)
2241 (apply display-error (fluid-ref the-last-stack) cep args)
2242 (run-hook after-error-hook)
2244 (throw 'abort key)))
2246 (define (quit . args)
2247 (apply throw 'quit args))
2251 ;;(define has-shown-backtrace-hint? #f) Defined by scm_init_backtrace ()
2253 ;; Replaced by C code:
2254 ;;(define (backtrace)
2255 ;; (if (fluid-ref the-last-stack)
2258 ;; (display-backtrace (fluid-ref the-last-stack) (current-output-port))
2260 ;; (if (and (not has-shown-backtrace-hint?)
2261 ;; (not (memq 'backtrace (debug-options-interface))))
2264 ;;"Type \"(debug-enable 'backtrace)\" if you would like a backtrace
2265 ;;automatically if an error occurs in the future.\n")
2266 ;; (set! has-shown-backtrace-hint? #t))))
2267 ;; (display "No backtrace available.\n")))
2269 (define (error-catching-repl r e p)
2270 (error-catching-loop
2272 (call-with-values (lambda () (e (r)))
2273 (lambda the-values (for-each p the-values))))))
2275 (define (gc-run-time)
2276 (cdr (assq 'gc-time-taken (gc-stats))))
2278 (define before-read-hook (make-hook))
2279 (define after-read-hook (make-hook))
2280 (define before-eval-hook (make-hook 1))
2281 (define after-eval-hook (make-hook 1))
2282 (define before-print-hook (make-hook 1))
2283 (define after-print-hook (make-hook 1))
2285 ;;; The default repl-reader function. We may override this if we've
2286 ;;; the readline library.
2291 (run-hook before-read-hook)
2292 (read (current-input-port))))
2294 (define (scm-style-repl)
2299 (repl-report-start-timing (lambda ()
2300 (set! start-gc-rt (gc-run-time))
2301 (set! start-rt (get-internal-run-time))))
2302 (repl-report (lambda ()
2304 (display (inexact->exact
2305 (* 1000 (/ (- (get-internal-run-time) start-rt)
2306 internal-time-units-per-second))))
2308 (display (inexact->exact
2309 (* 1000 (/ (- (gc-run-time) start-gc-rt)
2310 internal-time-units-per-second))))
2311 (display " msec in gc)\n")))
2313 (consume-trailing-whitespace
2315 (let ((ch (peek-char)))
2318 ((or (char=? ch #\space) (char=? ch #\tab))
2320 (consume-trailing-whitespace))
2321 ((char=? ch #\newline)
2325 (let ((prompt (cond ((string? scm-repl-prompt)
2327 ((thunk? scm-repl-prompt)
2329 (scm-repl-prompt "> ")
2331 (repl-reader prompt))))
2333 ;; As described in R4RS, the READ procedure updates the
2334 ;; port to point to the first character past the end of
2335 ;; the external representation of the object. This
2336 ;; means that it doesn't consume the newline typically
2337 ;; found after an expression. This means that, when
2338 ;; debugging Guile with GDB, GDB gets the newline, which
2339 ;; it often interprets as a "continue" command, making
2340 ;; breakpoints kind of useless. So, consume any
2341 ;; trailing newline here, as well as any whitespace
2343 ;; But not if EOF, for control-D.
2344 (if (not (eof-object? val))
2345 (consume-trailing-whitespace))
2346 (run-hook after-read-hook)
2347 (if (eof-object? val)
2349 (repl-report-start-timing)
2350 (if scm-repl-verbose
2353 (display ";;; EOF -- quitting")
2358 (-eval (lambda (sourc)
2359 (repl-report-start-timing)
2360 (run-hook before-eval-hook sourc)
2361 (let ((val (start-stack 'repl-stack
2362 ;; If you change this procedure
2363 ;; (primitive-eval), please also
2364 ;; modify the repl-stack case in
2365 ;; save-stack so that stack cutting
2366 ;; continues to work.
2367 (primitive-eval sourc))))
2368 (run-hook after-eval-hook sourc)
2372 (-print (let ((maybe-print (lambda (result)
2373 (if (or scm-repl-print-unspecified
2374 (not (unspecified? result)))
2379 (if (not scm-repl-silent)
2381 (run-hook before-print-hook result)
2382 (maybe-print result)
2383 (run-hook after-print-hook result)
2384 (if scm-repl-verbose
2388 (-quit (lambda (args)
2389 (if scm-repl-verbose
2391 (display ";;; QUIT executed, repl exitting")
2397 (if scm-repl-verbose
2399 (display ";;; ABORT executed.")
2402 (repl -read -eval -print))))
2404 (let ((status (error-catching-repl -read
2411 ;;; {IOTA functions: generating lists of numbers}
2414 (let loop ((count (1- n)) (result '()))
2415 (if (< count 0) result
2416 (loop (1- count) (cons count result)))))
2421 ;;; with `continue' and `break'.
2424 (defmacro while (cond . body)
2425 `(letrec ((continue (lambda () (or (not ,cond) (begin (begin ,@ body) (continue)))))
2426 (break (lambda val (apply throw 'break val))))
2428 (lambda () (continue))
2429 (lambda v (cadr v)))))
2433 ;;; Similar to `begin' but returns a list of the results of all constituent
2434 ;;; forms instead of the result of the last form.
2435 ;;; (The definition relies on the current left-to-right
2436 ;;; order of evaluation of operands in applications.)
2438 (defmacro collect forms
2443 ;; with-fluids is a convenience wrapper for the builtin procedure
2444 ;; `with-fluids*'. The syntax is just like `let':
2446 ;; (with-fluids ((fluid val)
2450 (defmacro with-fluids (bindings . body)
2451 `(with-fluids* (list ,@(map car bindings)) (list ,@(map cadr bindings))
2452 (lambda () ,@body)))
2459 ;; actually....hobbit might be able to hack these with a little
2463 (defmacro define-macro (first . rest)
2464 (let ((name (if (symbol? first) first (car first)))
2468 `(lambda ,(cdr first) ,@rest))))
2471 (define ,name (defmacro:transformer ,transformer)))
2473 (error "define-macro can only be used at the top level")))))
2476 (defmacro define-syntax-macro (first . rest)
2477 (let ((name (if (symbol? first) first (car first)))
2481 `(lambda ,(cdr first) ,@rest))))
2484 (define ,name (defmacro:syntax-transformer ,transformer)))
2486 (error "define-syntax-macro can only be used at the top level")))))
2489 ;;; {Module System Macros}
2492 ;; Return a list of expressions that evaluate to the appropriate
2493 ;; arguments for resolve-interface according to SPEC.
2495 (define (compile-interface-spec spec)
2496 (define (make-keyarg sym key quote?)
2497 (cond ((or (memq sym spec)
2501 (list key (list 'quote (cadr rest)))
2502 (list key (cadr rest)))))
2505 (define (map-apply func list)
2506 (map (lambda (args) (apply func args)) list))
2509 '((:select #:select #t)
2510 (:renamer #:renamer #f)))
2511 (if (not (pair? (car spec)))
2514 ,@(apply append (map-apply make-keyarg keys)))))
2516 (define (keyword-like-symbol->keyword sym)
2517 (symbol->keyword (string->symbol (substring (symbol->string sym) 1))))
2519 (define (compile-define-module-args args)
2520 ;; Just quote everything except #:use-module and #:use-syntax. We
2521 ;; need to know about all arguments regardless since we want to turn
2522 ;; symbols that look like keywords into real keywords, and the
2523 ;; keyword args in a define-module form are not regular
2524 ;; (i.e. no-backtrace doesn't take a value).
2525 (let loop ((compiled-args `((quote ,(car args))))
2528 (reverse! compiled-args))
2529 ;; symbol in keyword position
2530 ((symbol? (car args))
2532 (cons (keyword-like-symbol->keyword (car args)) (cdr args))))
2533 ((memq (car args) '(#:no-backtrace #:pure))
2534 (loop (cons (car args) compiled-args)
2537 (error "keyword without value:" (car args)))
2538 ((memq (car args) '(#:use-module #:use-syntax))
2539 (loop (cons* `(list ,@(compile-interface-spec (cadr args)))
2543 ((eq? (car args) #:autoload)
2544 (loop (cons* `(quote ,(caddr args))
2545 `(quote ,(cadr args))
2550 (loop (cons* `(quote ,(cadr args))
2555 (defmacro define-module args
2558 (let ((m (process-define-module
2559 (list ,@(compile-define-module-args args)))))
2560 (set-current-module m)
2563 (error "define-module can only be used at the top level"))))
2565 ;; The guts of the use-modules macro. Add the interfaces of the named
2566 ;; modules to the use-list of the current module, in order.
2568 ;; This function is called by "modules.c". If you change it, be sure
2569 ;; to change scm_c_use_module as well.
2571 (define (process-use-modules module-interface-args)
2572 (for-each (lambda (mif-args)
2573 (let ((mod-iface (apply resolve-interface mif-args)))
2575 (error "no such module" mif-args))
2576 (module-use! (current-module) mod-iface)))
2577 module-interface-args))
2579 (defmacro use-modules modules
2582 (process-use-modules
2583 (list ,@(map (lambda (m)
2584 `(list ,@(compile-interface-spec m)))
2587 (error "use-modules can only be used at the top level"))))
2589 (defmacro use-syntax (spec)
2593 `((process-use-modules (list
2594 (list ,@(compile-interface-spec spec))))
2595 (set-module-transformer! (current-module)
2596 ,(car (last-pair spec))))
2597 `((set-module-transformer! (current-module) ,spec))))
2599 (error "use-syntax can only be used at the top level"))))
2601 (define define-private define)
2603 (defmacro define-public args
2605 (error "bad syntax" (list 'define-public args)))
2606 (define (defined-name n)
2609 ((pair? n) (defined-name (car n)))
2615 (let ((name (defined-name (car args))))
2617 (define-private ,@args)
2618 (eval-case ((load-toplevel) (export ,name))))))))
2620 (defmacro defmacro-public args
2622 (error "bad syntax" (list 'defmacro-public args)))
2623 (define (defined-name n)
2631 (let ((name (defined-name (car args))))
2633 (eval-case ((load-toplevel) (export ,name)))
2634 (defmacro ,@args))))))
2636 ;; Export a local variable
2638 ;; This function is called from "modules.c". If you change it, be
2639 ;; sure to update "modules.c" as well.
2641 (define (module-export! m names)
2642 (let ((public-i (module-public-interface m)))
2643 (for-each (lambda (name)
2644 (let ((var (module-ensure-local-variable! m name)))
2645 (module-add! public-i name var)))
2648 ;; Re-export a imported variable
2650 (define (module-re-export! m names)
2651 (let ((public-i (module-public-interface m)))
2652 (for-each (lambda (name)
2653 (let ((var (module-variable m name)))
2655 (error "Undefined variable:" name))
2656 ((eq? var (module-local-variable m name))
2657 (error "re-exporting local variable:" name))
2659 (module-add! public-i name var)))))
2662 (defmacro export names
2665 (module-export! (current-module) ',names))
2667 (error "export can only be used at the top level"))))
2669 (defmacro re-export names
2672 (module-re-export! (current-module) ',names))
2674 (error "re-export can only be used at the top level"))))
2676 (define export-syntax export)
2677 (define re-export-syntax re-export)
2680 (define load load-module)
2684 ;;; {`cond-expand' for SRFI-0 support.}
2686 ;;; This syntactic form expands into different commands or
2687 ;;; definitions, depending on the features provided by the Scheme
2693 ;;; --> (cond-expand <cond-expand-clause>+)
2694 ;;; | (cond-expand <cond-expand-clause>* (else <command-or-definition>))
2695 ;;; <cond-expand-clause>
2696 ;;; --> (<feature-requirement> <command-or-definition>*)
2697 ;;; <feature-requirement>
2698 ;;; --> <feature-identifier>
2699 ;;; | (and <feature-requirement>*)
2700 ;;; | (or <feature-requirement>*)
2701 ;;; | (not <feature-requirement>)
2702 ;;; <feature-identifier>
2703 ;;; --> <a symbol which is the name or alias of a SRFI>
2705 ;;; Additionally, this implementation provides the
2706 ;;; <feature-identifier>s `guile' and `r5rs', so that programs can
2707 ;;; determine the implementation type and the supported standard.
2709 ;;; Currently, the following feature identifiers are supported:
2711 ;;; guile r5rs srfi-0
2713 ;;; Remember to update the features list when adding more SRFIs.
2715 (define %cond-expand-features
2716 ;; Adjust the above comment when changing this.
2717 '(guile r5rs srfi-0))
2719 ;; This table maps module public interfaces to the list of features.
2721 (define %cond-expand-table (make-hash-table 31))
2723 ;; Add one or more features to the `cond-expand' feature list of the
2726 (define (cond-expand-provide module features)
2727 (let ((mod (module-public-interface module)))
2729 (hashq-set! %cond-expand-table mod
2730 (append (hashq-ref %cond-expand-table mod '())
2734 (procedure->memoizing-macro
2736 (let ((clauses (cdr exp))
2737 (syntax-error (lambda (cl)
2738 (error "invalid clause in `cond-expand'" cl))))
2744 (or (memq clause %cond-expand-features)
2745 (let lp ((uses (module-uses (env-module env))))
2748 (hashq-ref %cond-expand-table
2754 ((eq? 'and (car clause))
2755 (let lp ((l (cdr clause)))
2759 (and (test-clause (car l)) (lp (cdr l))))
2761 (syntax-error clause)))))
2762 ((eq? 'or (car clause))
2763 (let lp ((l (cdr clause)))
2767 (or (test-clause (car l)) (lp (cdr l))))
2769 (syntax-error clause)))))
2770 ((eq? 'not (car clause))
2771 (cond ((not (pair? (cdr clause)))
2772 (syntax-error clause))
2773 ((pair? (cddr clause))
2774 ((syntax-error clause))))
2775 (not (test-clause (cadr clause))))
2777 (syntax-error clause))))
2779 (syntax-error clause))))))
2780 (let lp ((c clauses))
2783 (error "Unfulfilled `cond-expand'"))
2786 ((not (pair? (car c)))
2787 (syntax-error (car c)))
2788 ((test-clause (caar c))
2789 `(begin ,@(cdar c)))
2790 ((eq? (caar c) 'else)
2793 `(begin ,@(cdar c)))
2795 (lp (cdr c))))))))))
2797 ;; This procedure gets called from the startup code with a list of
2798 ;; numbers, which are the numbers of the SRFIs to be loaded on startup.
2800 (define (use-srfis srfis)
2803 (let* ((srfi (string->symbol
2804 (string-append "srfi-" (number->string (car s)))))
2805 (mod-i (resolve-interface (list 'srfi srfi))))
2806 (module-use! (current-module) mod-i)
2811 ;;; {Load emacs interface support if emacs option is given.}
2813 (define (named-module-use! user usee)
2814 (module-use! (resolve-module user) (resolve-interface usee)))
2816 (define (load-emacs-interface)
2817 (and (provided? 'debug-extensions)
2818 (debug-enable 'backtrace))
2819 (named-module-use! '(guile-user) '(ice-9 emacs)))
2823 (define using-readline?
2824 (let ((using-readline? (make-fluid)))
2825 (make-procedure-with-setter
2826 (lambda () (fluid-ref using-readline?))
2827 (lambda (v) (fluid-set! using-readline? v)))))
2830 (let ((guile-user-module (resolve-module '(guile-user))))
2832 ;; Load emacs interface support if emacs option is given.
2833 (if (and (module-defined? the-root-module 'use-emacs-interface)
2834 (module-ref the-root-module 'use-emacs-interface))
2835 (load-emacs-interface))
2837 ;; Use some convenient modules (in reverse order)
2839 (if (provided? 'regex)
2840 (module-use! guile-user-module (resolve-interface '(ice-9 regex))))
2841 (if (provided? 'threads)
2842 (module-use! guile-user-module (resolve-interface '(ice-9 threads))))
2843 ;; load debugger on demand
2844 (module-use! guile-user-module
2845 (make-autoload-interface guile-user-module
2846 '(ice-9 debugger) '(debug)))
2847 (module-use! guile-user-module (resolve-interface '(ice-9 session)))
2848 (module-use! guile-user-module (resolve-interface '(ice-9 debug)))
2849 ;; so that builtin bindings will be checked first
2850 (module-use! guile-user-module (resolve-interface '(guile)))
2852 (set-current-module guile-user-module)
2854 (let ((old-handlers #f)
2855 (signals (if (provided? 'posix)
2856 `((,SIGINT . "User interrupt")
2857 (,SIGFPE . "Arithmetic error")
2858 (,SIGBUS . "Bad memory access (bus error)")
2860 . "Bad memory access (Segmentation violation)"))
2867 (let ((make-handler (lambda (msg)
2869 ;; Make a backup copy of the stack
2870 (fluid-set! before-signal-stack
2871 (fluid-ref the-last-stack))
2872 (save-stack %deliver-signals)
2879 (map (lambda (sig-msg)
2880 (sigaction (car sig-msg)
2881 (make-handler (cdr sig-msg))))
2884 ;; the protected thunk.
2886 (let ((status (scm-style-repl)))
2887 (run-hook exit-hook)
2892 (map (lambda (sig-msg old-handler)
2893 (if (not (car old-handler))
2894 ;; restore original C handler.
2895 (sigaction (car sig-msg) #f)
2896 ;; restore Scheme handler, SIG_IGN or SIG_DFL.
2897 (sigaction (car sig-msg)
2899 (cdr old-handler))))
2900 signals old-handlers))))))
2902 (defmacro false-if-exception (expr)
2903 `(catch #t (lambda () ,expr)
2906 ;;; This hook is run at the very end of an interactive session.
2908 (define exit-hook (make-hook))
2911 (append! %load-path (list "."))
2913 ;; Place the user in the guile-user module.
2916 (define-module (guile-user))
2918 ;;; boot-9.scm ends here