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-;;;"scheme48.init" Initialisation for SLIB for Scheme48-0.57 -*-scheme-*-
-;;; Author: Aubrey Jaffer
-;;;
-;;; This code is in the public domain.
-
-,batch on
-,load-package floatnums
-,config
-,load =scheme48/misc/packages.scm
-(define-structure slib-primitives
- (export s48-getenv
- s48-system
- s48-current-error-port
- s48-force-output
- s48-with-handler
- s48-ascii->char
- s48-error)
- (open scheme signals ascii extended-ports i/o primitives handle
- posix c-system-function)
- (begin
- (define s48-getenv lookup-environment-variable)
- (define s48-system system)
- (define s48-current-error-port current-error-port)
- (define s48-force-output force-output)
- (define s48-with-handler with-handler)
- (define s48-ascii->char ascii->char)
- (define s48-error error)))
-,user
-,open slib-primitives
-
-(define getenv s48-getenv)
-(define system s48-system)
-
-;;; (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) 'Scheme48)
-
-;;; (scheme-implementation-home-page) should return a (string) URI
-;;; (Uniform Resource Identifier) for this scheme implementation's home
-;;; page; or false if there isn't one.
-(define (scheme-implementation-home-page) "http://s48.org/")
-
-;;; (scheme-implementation-version) should return a string describing
-;;; the version of the scheme implementation loading this file.
-(define scheme-implementation-version
- (let ((version (getenv "S48_VERSION")))
- (lambda () version)))
-
-;;; (implementation-vicinity) should be defined to be the pathname of
-;;; the directory where any auxiliary files to your Scheme
-;;; implementation reside.
-(define implementation-vicinity
- (let ((vic (getenv "S48_VICINITY")))
- (lambda () vic)))
-
-;;; (library-vicinity) should be defined to be the pathname of the
-;;; directory where files of Scheme library functions reside.
-(define library-vicinity
- (let ((vic (getenv "SCHEME_LIBRARY_PATH")))
- (lambda () vic)))
-
-;;; (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.
-;;;
-;;; Ivan Shmakov points out that evaluating (getenv "HOME") when
-;;; compiling captures the installer's home directory. So delay until
-;;; HOME-VICINITY is called.
-(define (home-vicinity)
- (let ((home (getenv "HOME")))
- (and home
- (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
- home
- (string-append home "/")))))
-
-;;; *FEATURES* should be set to a list of symbols describing features
-;;; of this implementation. See Template.scm for the list of feature
-;;; names.
-(define *features*
- '(
- source ;can load scheme source files
- ;(slib:load-source "filename")
-; compiled ;can load compiled files
- ;(slib:load-compiled "filename")
-
- ;; Scheme report features
-
- r5rs ;conforms to
- eval ;R5RS two-argument eval
- values ;R5RS multiple values
- dynamic-wind ;R5RS dynamic-wind
- macro ;R5RS high level macros
- delay ;has DELAY and FORCE
- multiarg-apply ;APPLY can take more than 2 args.
- char-ready?
- rationalize
- rev4-optional-procedures ;LIST-TAIL, STRING->LIST,
- ;LIST->STRING, STRING-COPY,
- ;STRING-FILL!, LIST->VECTOR,
- ;VECTOR->LIST, and VECTOR-FILL!
-
- r4rs ;conforms to
-
- ieee-p1178 ;conforms to
-
-; r3rs ;conforms to
-
-; rev2-procedures ;SUBSTRING-MOVE-LEFT!,
- ;SUBSTRING-MOVE-RIGHT!,
- ;SUBSTRING-FILL!,
- ;STRING-NULL?, APPEND!, 1+,
- ;-1+, <?, <=?, =?, >?, >=?
-; object-hash ;has OBJECT-HASH
-
-; multiarg/and- ;/ and - can take more than 2 args.
- with-file ;has WITH-INPUT-FROM-FILE and
- ;WITH-OUTPUT-TO-FILE
-; transcript ;TRANSCRIPT-ON and TRANSCRIPT-OFF
-; ieee-floating-point ;conforms to IEEE Standard 754-1985
- ;IEEE Standard for Binary
- ;Floating-Point Arithmetic.
- full-continuation ;can return multiple times
-
- ;; Other common features
-
-; srfi ;srfi-0, COND-EXPAND finds all srfi-*
-; sicp ;runs code from Structure and
- ;Interpretation of Computer
- ;Programs by Abelson and Sussman.
- defmacro ;has Common Lisp DEFMACRO
-; record ;has user defined data structures
-; string-port ;has CALL-WITH-INPUT-STRING and
- ;CALL-WITH-OUTPUT-STRING
-; sort
-; pretty-print
-; object->string
-; format ;Common-lisp output formatting
-; 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)
-; current-time ;returns time in seconds since 1/1/1970
- ;; Implementation Specific features
- ))
-
-;;; (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 s48-current-error-port)
-
-;;; (TMPNAM) makes a temporary file name.
-(define tmpnam
- (let ((cntr 100))
- (lambda () (set! cntr (+ 1 cntr))
- (let ((tmp (string-append "slib_" (number->string cntr))))
- (if (file-exists? tmp) (tmpnam) tmp)))))
-
-;;; (FILE-EXISTS? <string>)
-(define (file-exists? f)
- (call-with-current-continuation
- (lambda (k)
- (s48-with-handler
- (lambda (condition decline)
- (k #f))
- (lambda ()
- (close-input-port (open-input-file f))
- #t)))))
-
-;;; (DELETE-FILE <string>)
-(define (delete-file file-name)
- (system (string-append "rm " file-name)))
-
-;;; 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 . arg)
- (s48-force-output
- (if (null? arg) (current-output-port) (car arg))))
-
-(define (make-exchanger obj)
- (lambda (rep) (let ((old obj)) (set! obj rep) old)))
-(define (open-file filename modes)
- (case modes
- ((r rb) (open-input-file filename))
- ((w wb) (open-output-file filename))
- (else (slib:error 'open-file 'mode? modes))))
-(define (port? obj) (or (input-port? port) (output-port? port)))
-(define (call-with-open-ports . ports)
- (define proc (car ports))
- (cond ((procedure? proc) (set! ports (cdr ports)))
- (else (set! ports (reverse ports))
- (set! proc (car ports))
- (set! ports (reverse (cdr ports)))))
- (let ((ans (apply proc ports)))
- (for-each close-port ports)
- ans))
-(define (close-port port)
- (cond ((input-port? port)
- (close-input-port port)
- (if (output-port? port) (close-output-port port)))
- ((output-port? port) (close-output-port port))
- (else (slib:error 'close-port 'port? port))))
-
-(define (browse-url url)
- (define (try cmd) (eqv? 0 (system (sprintf #f cmd url))))
- (or (try "netscape-remote -remote 'openURL(%s)'")
- (try "netscape -remote 'openURL(%s)'")
- (try "netscape '%s'&")
- (try "netscape '%s'")))
-
-;;; "rationalize" adjunct procedures.
-(define (find-ratio x e)
- (let ((rat (rationalize x e)))
- (list (numerator rat) (denominator rat))))
-(define (find-ratio-between x y)
- (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))
-
-;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
-;;; be returned by CHAR->INTEGER.
-(define integer->char s48-ascii->char)
-(define char->integer
- (let ((char->integer char->integer)
- (code0 (char->integer (integer->char 0))))
- (lambda (char) (- (char->integer char) code0))))
-(define char-code-limit 256)
-
-;;; Workaround MODULO bug
-(define modulo
- (let ((modulo modulo))
- (lambda (n1 n2)
- (let ((ans (modulo n1 n2)))
- (if (= ans n2) (- ans ans) ans)))))
-
-;;; Workaround atan bug
-(define two-arg:atan atan)
-(define (atan y . x)
- (if (null? x) (two-arg:atan y 1) (two-arg:atan y (car x))))
-
-;;; Workaround inexact->exact and exact->inexact bugs.
-(define inexact->exact
- (let ((i->e inexact->exact))
- (lambda (z)
- (if (exact? z) z (i->e z)))))
-(define exact->inexact
- (let ((e->i exact->inexact))
- (lambda (z)
- (if (inexact? z) z (e->i z)))))
-
-;;; MOST-POSITIVE-FIXNUM is used in modular.scm
-(define most-positive-fixnum #x1FFFFFFF)
-
-;;; Return argument
-(define identity values)
-
-;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
-(define slib:eval
- (let ((eval eval)
- (interaction-environment interaction-environment))
- (lambda (form)
- (eval form (interaction-environment)))))
-
-;;; If your implementation provides R4RS macros:
-(define macro:eval slib:eval)
-(define (macro:load <pathname>)
- (if (not (file-exists? <pathname>))
- (set! <pathname> (string-append <pathname> (scheme-file-suffix))))
- (load <pathname>))
-
-(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:load macro:load)
-
-(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 ((cep (current-error-port)))
- ;;(if (provided? 'trace) (print-call-stack cep))
- (display "Warn: " cep)
- (for-each (lambda (x) (display #\ cep) (write x cep)) args))))
-
-;;; define an error procedure for the library
-(define (slib:error . args)
- ;;(if (provided? 'trace) (print-call-stack (current-error-port)))
- (apply s48-error args))
-
-;;; define these as appropriate for your system.
-(define slib:tab (s48-ascii->char 9))
-(define slib:form-feed (s48-ascii->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 them 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 #f))
-
-;;; Here for backward compatability
-(define scheme-file-suffix
- (case (software-type)
- ((NOSVE) (lambda () "_scm"))
- (else (lambda () ".scm"))))
-
-;;; (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)
-
-;;; Scheme48 complains that these are not defined (even though they
-;;; won't be called until they are).
-(define synclo:load #f)
-(define syncase:load #f)
-(define macwork:load #f)
-(define transcript-on #f)
-(define transcript-off #f)
-
-;;; Jacques Mequin wins the Spring 2001 SLIB extreme cleverness award:
-(define-syntax defmacro
- (lambda (e r c)
- (let* ((e-fields (cdr e))
- (macro-name (car e-fields))
- (macro-args (cdr e-fields))
- (slib-store (eval 'defmacro:eval (interaction-environment))))
- (slib-store `(defmacro ,macro-name ,@macro-args)))
- `(define-syntax ,(cadr e)
- (lambda (em rm cm)
- (let ((macro-name ',(cadr e))
- (macro-args (cdr em))
- (slib-eval (eval 'macroexpand-1 (interaction-environment))))
- (slib-eval `(,macro-name ,@macro-args)))))))
-
-(slib:load (in-vicinity (library-vicinity) "require"))
-
-;;; Needed to support defmacro
-(require 'defmacroexpand)
-(define *args* '())
-(define (program-arguments) (cons "scheme48" *args*))
-(set! *catalog* #f)
-
-,collect
-,batch off
-,dump slib.image "(slib 3a1)"
-,exit