Amiga Format CD 41/Amiga Format CD41 (1999-06)(Future Publishing)(GB)[!][issue 1999-07].iso/-seriously_amiga-/programming/other/scm/slib/vscm.init

Text File | 1999-04-19 | 11KB | 381 lines

;;; "vscm.init" Configuration of *features* for VSCM    -*-scheme-*-
;;; Author: Aubrey Jaffer
;;;
;;; This code is in the public domain.

;;; From: Matthias Blume <[e-mail]>
;;; Date: Tue, 1 Mar 1994 11:42:31 -0500
;;; Disclaimer: The code below is only a quick hack.  If I find some
;;; time to spare I might get around to make some more things work.

;;; You have to provide ``vscm.init'' as an explicit command line
;;; argument.  Since this is not very nice I would recommend the
;;; following installation procedure:

;1. run scheme
;2. (load "vscm.init")
;3. (slib:dump "dumpfile")
;3. mv dumpfile place-where-vscm-standard-bootfile-resides, e.g.
;   mv dumpfile /usr/local/vscm/lib/scheme-boot
;   (In this case vscm should have been compiled with flag
;    -DDEFAULT_BOOTFILE='"/usr/local/vscm/lib/scheme-boot"'.  See
;    Makefile (definition of DDP) for details.)

(define (slib:dump dump-to-file)
  (let ((args (dump dump-to-file)))
    (if args
    (begin
      (display "[SLIB available]")
      (newline)
      (((mcm) 'toplevel) args))
    (quit))))

;;; Caveat: While playing with this code I discovered a nasty bug.
;;; (Something is wrong with my ``restore'' code -- it seems to break
;;; on 64 bit machines (not always, though).)  It works on MIPS, etc.

;;; (software-type) should be set to the generic operating system type.
;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.

(define (software-type) 'UNIX)

;;; (scheme-implementation-type) should return the name of the scheme
;;; implementation loading this file.

(define (scheme-implementation-type) 'Vscm)

;;; (scheme-implementation-home-page) should return a (string) URL
;;; (Uniform Resource Locator) for this scheme implementation's home
;;; page; or false if there isn't one.

(define (scheme-implementation-home-page)
  "http://www.cs.princeton.edu/~blume/vscm/vscm.html")

;;; (scheme-implementation-version) should return a string describing the
;;; version the scheme implementation loading this file.

(define (scheme-implementation-version) "?")

;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxillary files to your Scheme
;;; implementation reside.

(define (implementation-vicinity)
  (case (software-type)
    ((UNIX)     "/usr/local/src/scheme/")
    ((VMS)    "scheme$src:")
    ((MS-DOS)    "C:\\scheme\\")))

;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.

(define library-vicinity
  (let ((library-path
     (or (getenv "SCHEME_LIBRARY_PATH")
         ;; Uses this path if SCHEME_LIBRARY_PATH is not set.
         (case (software-type)
           ((UNIX) "/usr/local/lib/slib/")
           ((VMS) "lib$scheme:")
           ((MS-DOS) "C:\\SLIB\\")
           (else "")))))
    (lambda () library-path)))

;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.

(define home-vicinity
  (let ((home-path (getenv "HOME")))
    (lambda () home-path)))

;;; *FEATURES* should be set to a list of symbols describing features
;;; of this implementation.  Suggestions for features are:

(define *features*
      '(
    source                ;can load scheme source files
                    ;(slib:load-source "filename")
;    compiled            ;can load compiled files
                    ;(slib:load-compiled "filename")
    rev4-report            ;conforms to
;    rev3-report            ;conforms to
    ieee-p1178            ;conforms to
;    sicp                ;runs code from Structure and
                    ;Interpretation of Computer
                    ;Programs by Abelson and Sussman.
    rev4-optional-procedures    ;LIST-TAIL, STRING->LIST,
                    ;LIST->STRING, STRING-COPY,
                    ;STRING-FILL!, LIST->VECTOR,
                    ;VECTOR->LIST, and VECTOR-FILL!
    rev3-procedures            ;LAST-PAIR, T, and NIL
;    rev2-procedures            ;SUBSTRING-MOVE-LEFT!,
                    ;SUBSTRING-MOVE-RIGHT!,
                    ;SUBSTRING-FILL!,
                    ;STRING-NULL?, APPEND!, 1+,
                    ;-1+, <?, <=?, =?, >?, >=?
    multiarg/and-            ;/ and - can take more than 2 args.
    multiarg-apply            ;APPLY can take more than 2 args.
    rationalize
    delay                ;has DELAY and FORCE
    with-file            ;has WITH-INPUT-FROM-FILE and
                    ;WITH-OUTPUT-FROM-FILE
    string-port            ;has CALL-WITH-INPUT-STRING and
                    ;CALL-WITH-OUTPUT-STRING
;    transcript            ;TRANSCRIPT-ON and TRANSCRIPT-OFF
;    char-ready?
;    macro                ;has R4RS high level macros
    defmacro            ;has Common Lisp DEFMACRO
;    eval                ;proposed 2-argument eval
;    record                ;has user defined data structures
    values                ;proposed multiple values
;    dynamic-wind            ;proposed dynamic-wind
    ieee-floating-point        ;conforms to
    full-continuation        ;can return multiple times
;    object-hash            ;has OBJECT-HASH

;    sort
;    queue                ;queues
;    pretty-print
    object->string
;    format
;    trace                ;has macros: TRACE and UNTRACE
;    compiler            ;has (COMPILER)
;    ed                ;(ED) is editor
    system                ;posix (system <string>)
    getenv                ;posix (getenv <string>)
    program-arguments        ;returns list of strings (argv)
;    Xwindows            ;X support
;    curses                ;screen management package
;    termcap                ;terminal description package
;    terminfo            ;sysV terminal description
    ))

;;; (OBJECT->STRING obj)  -- analogous to WRITE
(define object->string string-write)

;;; (PROGRAM-ARGUMENTS)
;;;
(define (program-arguments) command-line-arguments)

;;; (OUTPUT-PORT-WIDTH <port>)
(define (output-port-width . arg) 79)

;;; (CURRENT-ERROR-PORT)
(define (current-error-port)
  (standard-port 2))

;;; (TMPNAM) makes a temporary file name.
(define tmpnam (let ((cntr 100))
         (lambda () (set! cntr (+ 1 cntr))
             (string-append "slib_" (number->string cntr)))))

;;; (FILE-EXISTS? <string>)
(define (file-exists? f)
  (system (string-append "test -f " f)))

;;; (DELETE-FILE <string>)
(define (delete-file f)
  (remove-file f))

;;; FORCE-OUTPUT flushes any pending output on optional arg output port
(define force-output flush)

;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
;;; port versions of CALL-WITH-*PUT-FILE.

(define (call-with-output-string proc)
  (let ((outsp (open-output-string)))
    (proc outsp)
    (close-output-port outsp)))

(define (call-with-input-string string proc)
  (let* ((insp (open-input-string string))
     (res (proc insp)))
    (close-input-port insp)
    res))

;;; Implementation of string ports using generic ports
(define (open-input-string s)

  (let ((l (string-length s))
    (eof (call-with-values (lambda () (string-read "")) (lambda (x y) x))))

    (define (read)
      (call-with-values
       (lambda ()
     (string-read s))
       (lambda (obj res)
     (set! s res)
     (set! l (string-length res))
     obj)))

  (define (read-char)
    (if (zero? l)
    eof
    (let ((c (string-ref s 0)))
      (set! s (substring s 1 l))
      (set! l (- l 1))
      c)))

  (define (peek-char)
    (if (zero? l) eof (string-ref s 0)))

  (define (char-ready?) #t)

  (define (close) s)

  (open-input-generic read read-char peek-char char-ready? close)))

(define (open-output-string)

  (let ((s ""))

    (define (write x)
      (set! s (string-append s (string-write x)))
      x)

    (define (display x)
      (set! s (string-append s (string-display x)))
      x)

    (define (write-char x)
      (set! s (string-append s (string x)))
      x)

    (define (newline)
      (set! s (string-append s "\n"))
      #f)

    (define (flush) #f)

    (define (close) s)

    (open-output-generic write display write-char newline flush close)))

;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
;;; be returned by CHAR->INTEGER.
(define char-code-limit 256)

;;; MOST-POSITIVE-FIXNUM is used in modular.scm
(define most-positive-fixnum #x0fffffff)

;;; Return argument
(define (identity x) x)

;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define slib:eval eval)

;;; If your implementation provides R4RS macros:
(define macro:eval slib:eval)
(define macro:load load)

(define *defmacros*
  (list (cons 'defmacro
          (lambda (name parms . body)
        `(set! *defmacros* (cons (cons ',name (lambda ,parms ,@body))
                      *defmacros*))))))
(define (defmacro? m) (and (assq m *defmacros*) #t))

(define (macroexpand-1 e)
  (if (pair? e) (let ((a (car e)))
          (cond ((symbol? a) (set! a (assq a *defmacros*))
                     (if a (apply (cdr a) (cdr e)) e))
            (else e)))
      e))

(define (macroexpand e)
  (if (pair? e) (let ((a (car e)))
          (cond ((symbol? a)
             (set! a (assq a *defmacros*))
             (if a (macroexpand (apply (cdr a) (cdr e))) e))
            (else e)))
      e))

(define gentemp
  (let ((*gensym-counter* -1))
    (lambda ()
      (set! *gensym-counter* (+ *gensym-counter* 1))
      (string->symbol
       (string-append "slib:G" (number->string *gensym-counter*))))))

(define base:eval slib:eval)
(define (defmacro:eval x) (base:eval (defmacro:expand* x)))
(define (defmacro:expand* x)
  (require 'defmacroexpand) (apply defmacro:expand* x '()))

(define (defmacro:load <pathname>)
  (slib:eval-load <pathname> defmacro:eval))

(define (slib:eval-load <pathname> evl)
  (if (not (file-exists? <pathname>))
      (set! <pathname> (string-append <pathname> (scheme-file-suffix))))
  (call-with-input-file <pathname>
    (lambda (port)
      (let ((old-load-pathname *load-pathname*))
    (set! *load-pathname* <pathname>)
    (do ((o (read port) (read port)))
        ((eof-object? o))
      (evl o))
    (set! *load-pathname* old-load-pathname)))))

(define slib:warn
  (lambda args
    (let ((port (current-error-port)))
      (display "Warn: " port)
      (for-each (lambda (x) (display x port)) args))))

;;; define an error procedure for the library
(define (slib:error . argl)
  (error argl))

;;; define these as appropriate for your system.
(define slib:tab #\Tab)
(define slib:form-feed #\d12)

;;; Support for older versions of Scheme.  Not enough code for its own file.
(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
(define t #t)
(define nil #f)

;;; Define these if your implementation's syntax can support it and if
;;; they are not already defined.

(define (1+ n) (+ n 1))
(define (-1+ n) (+ n -1))
(define 1- -1+)

(define in-vicinity string-append)

;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exitting not supported.
(define slib:exit
  (lambda args
    (cond ((null? args) (quit))
      ((eqv? #t (car args)) (quit))
      ((eqv? #f (car args)) (quit 1))
      (else (quit (car args))))))

;;; Here for backward compatability
(define scheme-file-suffix
  (let ((suffix (case (software-type)
          ((NOSVE) "_scm")
          (else ".scm"))))
    (lambda () suffix)))

;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
;;; suffix all the module files in SLIB have.  See feature 'SOURCE.

(define (slib:load-source f) (load (string-append f (scheme-file-suffix))))

;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
;;; by compiling "foo.scm" if this implementation can compile files.
;;; See feature 'COMPILED.

(define slib:load-compiled load)

;;; At this point SLIB:LOAD must be able to load SLIB files.

(define slib:load slib:load-source)

(slib:load (in-vicinity (library-vicinity) "require"))