339 lines
15 KiB
Scheme
339 lines
15 KiB
Scheme
;;; "vx-scheme.init" configuration template of *features* for Scheme -*-scheme-*-
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;;; Author: Chris Gaskett
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;;;
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;;; This code is in the public domain.
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;;; this version for vx-scheme under cygwin (at least)
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;;; (software-type) should be set to the generic operating system type.
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;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
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(define (software-type) 'UNIX)
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;;; (scheme-implementation-type) should return the name of the scheme
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;;; implementation loading this file.
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;(define (scheme-implementation-type) 'vx-scheme)
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;;; (scheme-implementation-home-page) should return a (string) URI
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;;; (Uniform Resource Identifier) for this scheme implementation's home
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;;; page; or false if there isn't one.
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;(define (scheme-implementation-home-page)
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; "http://colin-smith.net/vx-scheme/")
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;;; (scheme-implementation-version) should return a string describing
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;;; the version the scheme implementation loading this file.
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;(define (scheme-implementation-version) *version*)
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;;; (implementation-vicinity) should be defined to be the pathname of
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;;; the directory where any auxillary files to your Scheme
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;;; implementation reside.
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(define (implementation-vicinity) "")
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; (case (software-type)
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; ((UNIX) "/usr/local/src/scheme/")
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; ((VMS) "scheme$src:")
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; ((MS-DOS) "C:\\scheme\\")))
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;;; (library-vicinity) should be defined to be the pathname of the
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;;; directory where files of Scheme library functions reside.
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; (define library-vicinity
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; (let ((library-path
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; (or
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; ;; Use this getenv if your implementation supports it.
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; ; (getenv "SCHEME_LIBRARY_PATH")
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; ;; Use this path if your scheme does not support GETENV
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; ;; or if SCHEME_LIBRARY_PATH is not set.
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; (case (software-type)
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; ((UNIX) "/usr/local/lib/slib/")
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; ((VMS) "lib$scheme:")
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; ((MS-DOS) "C:\\SLIB\\")
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; (else "")))))
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; (lambda () library-path)))
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;(define (library-vicinity) "/usr/local/lib/slib/")
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(define (library-vicinity) "/usr/share/slib/")
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;;; (home-vicinity) should return the vicinity of the user's HOME
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;;; directory, the directory which typically contains files which
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;;; customize a computer environment for a user.
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(define (home-vicinity) "")
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; (define (home-vicinity)
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; (let ((home (getenv "HOME")))
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; (and home
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; (case (software-type)
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; ((UNIX COHERENT MS-DOS) ;V7 unix has a / on HOME
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; (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
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; home
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; (string-append home "/")))
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; (else home)))))
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;;; *FEATURES* should be set to a list of symbols describing features
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;;; of this implementation. Suggestions for features are:
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;;; @TODO@ some of these are wrong
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(define *features*
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'(
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source ;can load scheme source files
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;(slib:load-source "filename")
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; compiled ;can load compiled files
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;(slib:load-compiled "filename")
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;; Scheme report features
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; rev5-report ;conforms to
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; eval ;R5RS two-argument eval
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; values ;R5RS multiple values
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; dynamic-wind ;R5RS dynamic-wind
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; macro ;R5RS high level macros
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delay ;has DELAY and FORCE
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multiarg-apply ;APPLY can take more than 2 args.
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char-ready?
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; rationalize
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rev4-optional-procedures ;LIST-TAIL, STRING->LIST,
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;LIST->STRING, STRING-COPY,
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;STRING-FILL!, LIST->VECTOR,
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;VECTOR->LIST, and VECTOR-FILL!
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rev4-report ;conforms to
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ieee-p1178 ;conforms to
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; rev3-report ;conforms to
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; rev2-procedures ;SUBSTRING-MOVE-LEFT!,
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;SUBSTRING-MOVE-RIGHT!,
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;SUBSTRING-FILL!,
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;STRING-NULL?, APPEND!, 1+,
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;-1+, <?, <=?, =?, >?, >=?
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; object-hash ;has OBJECT-HASH
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; multiarg/and- ;/ and - can take more than 2 args.
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with-file ;has WITH-INPUT-FROM-FILE and
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;WITH-OUTPUT-FROM-FILE
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; transcript ;TRANSCRIPT-ON and TRANSCRIPT-OFF
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ieee-floating-point ;conforms to IEEE Standard 754-1985
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;IEEE Standard for Binary
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;Floating-Point Arithmetic.
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full-continuation ;can return multiple times
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;; Other common features
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; srfi ;srfi-0, COND-EXPAND finds all srfi-*
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; sicp ;runs code from Structure and
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;Interpretation of Computer
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;Programs by Abelson and Sussman.
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defmacro ;has Common Lisp DEFMACRO
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; record ;has user defined data structures
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; string-port ;has CALL-WITH-INPUT-STRING and
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;CALL-WITH-OUTPUT-STRING
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; sort
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; pretty-print
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; object->string
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; format ;Common-lisp output formatting
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; trace ;has macros: TRACE and UNTRACE
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; compiler ;has (COMPILER)
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; ed ;(ED) is editor
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; system ;posix (system <string>)
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; getenv ;posix (getenv <string>)
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; program-arguments ;returns list of strings (argv)
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; current-time ;returns time in seconds since 1/1/1970
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;; Implementation Specific features
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))
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;;; (OUTPUT-PORT-WIDTH <port>)
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(define (output-port-width . arg) 79)
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;;; (OUTPUT-PORT-HEIGHT <port>)
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(define (output-port-height . arg) 24)
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;;; (CURRENT-ERROR-PORT)
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(define current-error-port
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(let ((port (current-output-port)))
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(lambda () port)))
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;;; (TMPNAM) makes a temporary file name.
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(define tmpnam (let ((cntr 100))
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(lambda () (set! cntr (+ 1 cntr))
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(string-append "slib_" (number->string cntr)))))
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;;; (FILE-EXISTS? <string>)
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;; provided in custom version of vx-scheme
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;;(define (file-exists? f) #f)
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;;; (DELETE-FILE <string>)
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(define (delete-file f) #f)
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;;; FORCE-OUTPUT flushes any pending output on optional arg output port
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;;; use this definition if your system doesn't have such a procedure.
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(define (force-output . arg) #t)
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;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
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;;; port versions of CALL-WITH-*PUT-FILE.
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;;; "rationalize" adjunct procedures.
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;;(define (find-ratio x e)
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;; (let ((rat (rationalize x e)))
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;; (list (numerator rat) (denominator rat))))
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;;(define (find-ratio-between x y)
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;; (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))
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;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
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;;; be returned by CHAR->INTEGER.
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(define char-code-limit 256)
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;;; MOST-POSITIVE-FIXNUM is used in modular.scm
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(define most-positive-fixnum #x0FFFFFFF)
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;;; Return argument
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(define (identity x) x)
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;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
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(define slib:eval eval)
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;;; If your implementation provides R4RS macros:
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;(define macro:eval slib:eval)
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;(define macro:load load)
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(define *defmacros*
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(list (cons 'defmacro
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(lambda (name parms . body)
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`(set! *defmacros* (cons (cons ',name (lambda ,parms ,@body))
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*defmacros*))))))
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(define (defmacro? m) (and (assq m *defmacros*) #t))
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(define (macroexpand-1 e)
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(if (pair? e)
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(let ((a (car e)))
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(cond ((symbol? a) (set! a (assq a *defmacros*))
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(if a (apply (cdr a) (cdr e)) e))
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(else e)))
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e))
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(define (macroexpand e)
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(if (pair? e)
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(let ((a (car e)))
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(cond ((symbol? a)
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(set! a (assq a *defmacros*))
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(if a (macroexpand (apply (cdr a) (cdr e))) e))
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(else e)))
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e))
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(define gentemp
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(let ((*gensym-counter* -1))
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(lambda ()
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(set! *gensym-counter* (+ *gensym-counter* 1))
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(string->symbol
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(string-append "slib:G" (number->string *gensym-counter*))))))
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(define base:eval slib:eval)
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(define (defmacro:eval x) (base:eval (defmacro:expand* x)))
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(define (defmacro:expand* x)
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(require 'defmacroexpand) (apply defmacro:expand* x '()))
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(define (defmacro:load <pathname>)
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(slib:eval-load <pathname> defmacro:eval))
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(define (slib:eval-load <pathname> evl)
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(if (not (file-exists? <pathname>))
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(set! <pathname> (string-append <pathname> (scheme-file-suffix))))
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(call-with-input-file <pathname>
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(lambda (port)
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(let ((old-load-pathname *load-pathname*))
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(set! *load-pathname* <pathname>)
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(do ((o (read port) (read port)))
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((eof-object? o))
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(evl o))
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(set! *load-pathname* old-load-pathname)))))
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(define slib:warn
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(lambda args
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(let ((cep (current-error-port)))
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(if (provided? 'trace) (print-call-stack cep))
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(display "Warn: " cep)
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(for-each (lambda (x) (display #\ cep) (write x cep)) args)
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(newline cep))))
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;;; define an error procedure for the library
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;; error function in vx-scheme expects one string
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;; so this is a copy of the warn function above
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;;(define (slib:error . args)
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;; (if (provided? 'trace) (print-call-stack (current-error-port)))
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;; (apply error args))
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(define slib:error
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(lambda args
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(let ((cep (current-error-port)))
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(if (provided? 'trace) (print-call-stack cep))
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(display "Error: " cep)
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(for-each (lambda (x) (display #\ cep) (write x cep)) args)
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(newline cep))))
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(define (make-exchanger obj)
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(lambda (rep) (let ((old obj)) (set! obj rep) old)))
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(define (open-file filename modes)
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(case modes
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((r rb) (open-input-file filename))
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((w wb) (open-output-file filename))
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(else (slib:error 'open-file 'mode? modes))))
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(define (port? obj) (or (input-port? port) (output-port? port)))
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(define (call-with-open-ports . ports)
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(define proc (car ports))
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(cond ((procedure? proc) (set! ports (cdr ports)))
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(else (set! ports (reverse ports))
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(set! proc (car ports))
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(set! ports (reverse (cdr ports)))))
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(let ((ans (apply proc ports)))
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(for-each close-port ports)
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ans))
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(define (close-port port)
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(cond ((input-port? port)
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(close-input-port port)
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(if (output-port? port) (close-output-port port)))
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((output-port? port) (close-output-port port))
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(else (slib:error 'close-port 'port? port))))
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(define (browse-url url)
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(define (try cmd end) (zero? (system (string-append cmd url end))))
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(or (try "netscape-remote -remote 'openURL(" ")'")
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(try "netscape -remote 'openURL(" ")'")
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(try "netscape '" "'&")
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(try "netscape '" "'")))
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;;; define these as appropriate for your system.
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(define slib:tab (integer->char 9))
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(define slib:form-feed (integer->char 12))
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;;; Support for older versions of Scheme. Not enough code for its own file.
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(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
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(define t #t)
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(define nil #f)
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;;; Define these if your implementation's syntax can support it and if
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;;; they are not already defined.
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;(define (1+ n) (+ n 1))
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;(define (-1+ n) (+ n -1))
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;(define 1- -1+)
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(define in-vicinity string-append)
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;;; Define SLIB:EXIT to be the implementation procedure to exit or
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;;; return if exitting not supported.
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(define slib:exit (lambda args #f))
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;;; Here for backward compatability
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(define scheme-file-suffix
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(let ((suffix (case (software-type)
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((NOSVE) "_scm")
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(else ".scm"))))
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(lambda () suffix)))
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;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
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;;; suffix all the module files in SLIB have. See feature 'SOURCE.
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(define (slib:load-source f) (load (string-append f ".scm")))
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;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
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;;; by compiling "foo.scm" if this implementation can compile files.
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;;; See feature 'COMPILED.
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(define slib:load-compiled load)
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;;; At this point SLIB:LOAD must be able to load SLIB files.
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(define slib:load slib:load-source)
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(slib:load (in-vicinity (library-vicinity) "require"))
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