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Amiga Format CD 41
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Amiga Format CD41 (1999-06)(Future Publishing)(GB)[!][issue 1999-07].iso
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programming
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scm
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slib
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pscheme.init
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1999-04-19
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;;; "pscheme.init" -*-scheme-*-
;;; SLIB init file for Pocket Scheme
;;; SLIB orig Author: Aubrey Jaffer (jaffer@ai.mit.edu)
;;; initial pscheme work for 0.2.3 by Robert Goldman (goldman@htc.honeywell.com)
;;;
;;; This code is in the public domain.
; best fit for Windows CE?
(define (software-type) 'MS-DOS)
(define (scheme-implementation-type) 'PocketScheme)
(define (scheme-implementation-version) "0.2.5")
(define (scheme-implementation-home-page)
"http://www.angrygraycat.com/scheme/pscheme.htm")
(define (implementation-vicinity)
"\\Program Files\\Pocket Scheme\\")
(define (library-vicinity)
(string-append
(implementation-vicinity)
"slib\\"))
(define (home-vicinity)
"\\My Documents\\")
(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
eval ;R5RS two-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
; 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) 12)
;;; (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)
(let ((file #f))
(with-handlers (
((lambda (x) #t) (lambda (x) #f))
)
(set! file (open-input-file f))
(close-input-port file)
#t)))
;; pscheme: current-error-port, delete-file, force-output already defined
;;; 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 #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:
;; n.b. since pscheme doesn't support qq, slib can't fake it
;(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 (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 (defmacro:load <pathname>)
(slib:eval-load <pathname> defmacro:eval))
(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 exit)
;;; Here for backward compatability
(define (scheme-file-suffix) ".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 ".scm")))
;;; (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)
;; Hold onto pscheme native version
(define pscheme:require require)
(slib:load (in-vicinity (library-vicinity) "require"))