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Amiga Format CD41 (1999-06)(Future Publishing)(GB)[!][issue 1999-07].iso
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slib
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t3.init
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1999-04-19
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;;; "t3.init" Initialization file for SLIB for T3.1. -*-scheme-*-
;;; Authors: David Carlton, Stephen Bevan, F. Javier Thayer, and Aubrey Jaffer.
;;;
;;; This code is in the public domain.
;;; File has T syntax, and should be compiled in standard-env.
;;; Compiled file has .so suffix.
;;; File (or compiled version) should be loaded into scheme-env.
;;; This is provided with ABSOLUTELY NO GUARANTEE.
(herald t3)
(define (software-type) 'UNIX)
(define (scheme-implementation-type) 'T)
(define (scheme-implementation-version) "3.1")
;;; (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)
"ftp://ftp.cs.indiana.edu:21/pub/scheme-repository/imp/t/README")
;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxillary files to your Scheme
;;; implementation reside. It is settable.
(define implementation-vicinity
(make-simple-switch 'implementation-vicinity
(lambda (x) (or (string? x) (false? x)))
'#f))
(set (implementation-vicinity) "/usr/local/lib/tsystem/")
;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside. It is settable.
(define library-vicinity
(make-simple-switch 'library-vicinity
(lambda (x) (or (string? x) (false? x)))
'#f))
(set (library-vicinity) "/usr/local/lib/slib/")
;;Obviously put your value here.
;;; (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. 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")
rev3-report
rev4-optional-procedures
rev3-procedures
rev2-procedures
multiarg/and-
multiarg-apply
rationalize
object-hash
delay
i/o-redirection
char-ready?
with-file
transcript
full-continuation
pretty-print
format
trace ;has macros: TRACE and UNTRACE
program-arguments
))
(define substring
(let ((primitive-substring (*value standard-env 'substring)))
(lambda (string start end)
(primitive-substring string start (max 0 (- end 1))))))
; Modify substring as T's substring takes (start,count) instead of
; (start,end)
(set (syntax-table-entry (env-syntax-table scheme-env) 'require) '#f)
; Turn off the macro REQUIRE so that it can be rebound as a function
; later.
; extend <, >, <= and >= so that they take more than two arguments.
(define <
(let ((primitive< (*value standard-env '<)))
(labels ((v (lambda (a b . rest)
(if (null? rest)
(primitive< a b)
(and (primitive< a b)
(apply v b (car rest) (cdr rest)))))))
v)))
(define >
(let ((primitive> (*value standard-env '>)))
(labels ((v (lambda (a b . rest)
(if (null? rest)
(primitive> a b)
(and (primitive> a b)
(apply v b (car rest) (cdr rest)))))))
v)))
(define <=
(let ((primitive<= (*value standard-env '<=)))
(labels ((v (lambda (a b . rest)
(if (null? rest)
(primitive<= a b)
(and (primitive<= a b)
(apply v b (car rest) (cdr rest)))))))
v)))
(define >=
(let ((primitive>= (*value standard-env '>=)))
(labels ((v (lambda (a b . rest)
(if (null? rest)
(primitive>= a b)
(and (primitive>= a b)
(apply v b (car rest) (cdr rest)))))))
v)))
(define =
(let ((primitive= (*value standard-env '=)))
(labels ((v (lambda (a b . rest)
(if (null? rest)
(primitive= a b)
(and (primitive= a b)
(apply v b (car rest) (cdr rest)))))))
v)))
(define gcd
(let ((prim (*value standard-env 'gcd)))
(labels ((v (lambda x
(cond ((null? x) 0)
((= (length x) 1) (car x))
('#t (prim (car x) (apply v (cdr x))))))))
v)))
(define list? (*value standard-env 'proper-list?))
(define program-arguments command-line)
;;; (OUTPUT-PORT-WIDTH <port>)
(define output-port-width
(lambda x
(if (null? x) (line-length (standard-input))
(line-length (car x)))))
;;; (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))
(let ((tmp (string-append "slib_" (number->string cntr))))
(if (file-exists? tmp) (tmpnam) tmp)))))
(define delete-file file-delete)
;;; 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
;;; T already has it.
;;; Return argument
(define (identity x) x)
;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define (slib:eval form) (eval form scheme-env))
;;; 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 error)
;;; define these as appropriate for your system.
(define slib:tab #\tab)
(define slib:form-feed #\form)
;;; 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+ n) (+ n -1))
(define program-vicinity
(make-simple-switch 'program-vicinity
(lambda (x) (or (string? x) (false? x)))
'#f))
(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))
(define (string . args) (apply string-append (map char->string args)))
(define make-string
(let ((t:make-string (*value standard-env 'make-string)))
(lambda (a . b)
(let ((str (t:make-string a)))
(if b (map-string! (lambda (x) (ignore x) (car b)) str) str)))))
(define (string>? a b)
(labels ((aux
(lambda (n a b)
;;start off with n<=(string-length b) and n<=(string-length a)
;;a,b coincide for chars <n
(cond ((= (string-length a) n) (< n (string-length b)))
;;now (< n (string-length a))
((= (string-length b) n) '#f)
;;now (< n (string-length a))
((char=? (nthchar a n) (nthchar b n) ) (aux (+ 1 n) a b))
('#t (char<? (nthchar b n) (nthchar a n)))))))
(aux 0 a b)))
(define (string<? a b) (string>? b a))
(define (string<=? a b) (not (string>? a b)))
(define (string>=? a b) (not (string<? a b)))
(define (string-ci<? a b)
(string<? (string-upcase a) (string-upcase b)))
(define (string-ci>? a b)
(string>? (string-upcase a) (string-upcase b)))
(define (string-ci<=? a b)
(string<=? (string-upcase a) (string-upcase b)))
(define (string-ci>=? a b)
(string>=? (string-upcase a) (string-upcase b)))
;;; FORCE-OUTPUT flushes any pending output on optional arg output port
;;; use this definition if your system doesn't have such a procedure.
;;; T already has it, but requires 1 argument.
(define force-output
(let ((t:force-output (*value standard-env 'force-output)))
(lambda x
(if x
(t:force-output (car x))
(t:force-output (current-output-port))))))
;;; 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)
(with-output-to-string var (proc var)))
(define (call-with-input-string string proc)
(with-input-from-string (variable string) (proc variable)))
(define (string->number s . x)
(let ((base (if x (car x) 10))
(s (string-upcase s)))
(or (mem? = base '(8 10 16))
(error (format (current-error-port) "Bad radix ~A" base)))
(if (= (string-length s) 0) '()
(let ((char->number
(lambda (ch)
(cdr (ass char=? ch
'((#\0 . 0)
(#\1 . 1) (#\2 . 2) (#\3 . 3) (#\4 . 4)
(#\5 . 5) (#\6 . 6) (#\7 . 7) (#\8 . 8)
(#\9 . 9) (#\A . 10) (#\B . 11) (#\C . 12)
(#\D . 13) (#\E . 14) (#\F . 15)))))))
(catch not-num
(iterate loop ((pos (- (string-length s) 1))
(power 1) (accum 0))
(if (< pos 0) accum
(let ((num (char->number (string-ref s pos))))
(or num (not-num '()))
(or (< num base) (not-num '()))
(loop (- pos 1)
(* power base)
(+ accum (* num power)))))))))))
(define (number->string n . x)
(let ((rad (if (car x) (car x) 10)))
(format nil
(case rad
((8) "~O")
((10) "~D")
((16) "~X")
(else (error (format (current-error-port)
"Bad radix ~A" (car x)))))
n)))
(define (inexact? f)
(float? f))
(define (exact? f)
(not (inexact? f)))
(define exact->inexact ->float)
(define peek-char
(let ((t:peek-char (*value standard-env 'peek-char)))
(lambda p
(let ((port (if p (car p) (current-input-port))))
(t:peek-char port)))))
;;;(set ((*value scheme-env 'standard-early-binding-env) 'load) '#f)
;;;(set ((*value scheme-env 'standard-early-binding-env) 'substring) '#f)
(set ((*value scheme-env 'standard-early-binding-env) 'less?) '#f)
(set ((*value scheme-env 'standard-early-binding-env) 'greater?) '#f)
(set ((*value scheme-env 'standard-early-binding-env) 'not-less?) '#f)
(set ((*value scheme-env 'standard-early-binding-env) 'not-greater?) '#f)
(set ((*value scheme-env 'standard-early-binding-env) 'number-equal?) '#f)
(set ((*value scheme-internal-env 'standard-early-binding-env) 'list?) '#f)
(set ((*value t-implementation-env 'SOURCE-FILE-EXTENSION)) 'scm)
;;; Here for backward compatability
(define (scheme-file-suffix) "")
(define load
(let ((t:load (*value standard-env 'load)))
(lambda (filespec . x)
(apply t:load (->filename filespec) x))))
;;; (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") scheme-env)
;;;(define scheme-read-table
;;; (make-read-table standard-read-table 'modified-read-table))
;;;
;;;(set (read-table-entry scheme-read-table '#\#)
;;; (lambda (p ch rtable)
;;; (ignore ch) (ignore rtable)
;;; ((*value scheme-env 'string->number)
;;; (symbol->string (read-refusing-eof p)) 16)))
;;;
;;;(set (port-read-table (standard-input)) scheme-read-table)
; eof