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

Text File | 1999-04-19 | 9KB | 292 lines

;;;"gambit.init" Initialization for SLIB for Gambit    -*-scheme-*-
;;; Author: Aubrey Jaffer
;;;
;;; This code is in the public domain.

;;; Updated 1992 February 1 for Gambit v1.71 -- by Ken Dickey
;;; Date: Wed, 12 Jan 1994 15:03:12 -0500
;;; From: [e-mail] (Lewis Barnett)
;;; Relative pathnames for Slib in MacGambit
;;; Hacked yet again for Gambit v2.4, Jan 1997, by Mike Pope

(define (software-type) 'MACOS)        ; for MacGambit.
(define (software-type) 'UNIX)        ; for Unix platforms.

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

;;; (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.iro.umontreal.ca/~gambit/index.html")

(define (scheme-implementation-version) "3.0")
;;; Jefferson R. Lowrey reports that in Gambit Version 3.0
;;; (argv) returns '("").
(define argv
  (if (equal? '("") (argv))        ;Fix only if it is broken.
      (lambda () '("Lowrey HD:Development:MacGambit 3.0:Interpreter"))
      argv))

;;; (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)    (lambda () "/usr/local/src/scheme/"))
    ((VMS)    (lambda () "scheme$src:"))
    ((MS-DOS)    (lambda () "C:\\scheme\\"))
    ((WINDOWS)  (lambda () "c:/scheme/"))
    ((MACOS)
     (let ((arg0 (list-ref (argv) 0)))
       (let loop ((i (- (string-length arg0) 1)))
     (cond ((negative? i) "")
           ((char=? #\: (string-ref arg0 i))
        (set! arg0 (substring arg0 0 (+ i 1)))
        (lambda () arg0))
           (else (loop (- i 1)))))))))

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

;;; This assumes that the slib files are in a folder
;;; called slib in the same directory as the MacGambit Interpreter.

(define library-vicinity
  (let ((library-path
     (case (software-type)
       ((UNIX) "/usr/local/lib/slib/")
       ((MACOS) (string-append (implementation-vicinity) "slib:"))
       ((AMIGA)    "dh0:scm/Library/")
       ((VMS) "lib$scheme:")
       ((WINDOWS 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) #f)

;;; *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!
;    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
;    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
;    current-time            ;returns time in seconds since 1/1/1970
    ))

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

;;; (OUTPUT-PORT-HEIGHT <port>)
(define (output-port-height . arg) 24)

;;; (CURRENT-ERROR-PORT)
(define current-error-port
  (let ((port (current-output-port)))
    (lambda () port)))

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

;;; Gambit supports SYSTEM as an "Unstable Addition"; Watch for changes.
(define system ##shell-command)

;;; (FILE-EXISTS? <string>)
;(define (file-exists? f) #f)

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

;;; FORCE-OUTPUT flushes any pending output on optional arg output port
;;; use this definition if your system doesn't have such a procedure.
(define force-output flush-output)

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

;;; 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 #x1FFFFFFF) ; 3-bit tag for 68K

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

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

; Define program-arguments as argv
(define program-arguments argv)

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

; Set up defmacro in terms of gambit's define-macro
(define-macro (defmacro name args . body)
  `(define-macro (,name ,@args) ,@body))

(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 base:eval)

(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 error)

;; define these as appropriate for your system.
(define slib:tab (integer->char 9))
(define slib:form-feed (integer->char 12))

;;; 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 (exit)))

;;; 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 load)

;;; (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"))