396 lines
12 KiB
Scheme
396 lines
12 KiB
Scheme
; Derived from: -*-scheme-*-
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; "Template.scm" configuration template of *features* for Scheme
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; Copyright (C) 1991, 1992, 1993 Aubrey Jaffer.
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; Compatibility file for MzScheme --
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; http://www.plt-scheme.org/software/mzscheme/
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; -- and DrScheme --
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; http://www.plt-scheme.org/software/drscheme/
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; -- produced by Shriram Krishnamurthi <sk@cs.brown.edu>,
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; Mon Feb 10 12:03:53 CST 1997
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(require (lib "pretty.ss"))
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(unless (memq (system-type) '(unix beos))
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(namespace-require '(lib "date.ss")))
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;; See hack at end:
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(require (rename mzscheme mz:require require))
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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)
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(case (system-type)
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[(unix macosx) 'UNIX]
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[(windows) 'MS-DOS]
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[(macos) 'MACOS]
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[else (system-type)]))
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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) '|MzScheme|)
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;;; (scheme-implementation-home-page) should return a (string) URL
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;;; (Uniform Resource Locator) 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://www.plt-scheme.org/")
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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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(let ([path
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(or (getenv "PLTHOME")
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(with-handlers ([void (lambda (x) #f)])
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(let ([p (collection-path "mzlib")])
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(let*-values ([(base name dir?) (split-path p)]
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[(base name dir?) (split-path base)])
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(and (string? base) base))))
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(case (system-type)
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((unix macosx) "/usr/local/lib/plt")
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((windows) "C:\\Program Files\\PLT")
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((macos) "My Disk:plt:")))])
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(lambda () path)))
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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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(with-handlers ([void
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(lambda (x)
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(error 'slib-init
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"can't find SCHEME_LIBRARY_PATH environment variable or \"slib\" collection"))])
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(collection-path "slib")))))
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(lambda () library-path)))
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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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(find-system-path 'home-dir))
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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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(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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rev4-report ;conforms to
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; rev3-report ;conforms to
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; ieee-p1178 ;conforms to
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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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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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; 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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multiarg/and- ;/ and - can take more than 2 args.
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multiarg-apply ;APPLY can take more than 2 args.
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rationalize
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delay ;has DELAY and FORCE
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with-file ;has WITH-INPUT-FROM-FILE and
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;WITH-OUTPUT-FROM-FILE
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string-port ;has CALL-WITH-INPUT-STRING and
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;CALL-WITH-OUTPUT-STRING
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; transcript ;TRANSCRIPT-ON and TRANSCRIPT-OFF
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char-ready?
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macro ;has R4RS high level macros
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defmacro ;has Common Lisp DEFMACRO
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eval ;SLIB:EVAL is single argument eval
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; record ;has user defined data structures
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values ;proposed multiple values
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dynamic-wind ;proposed dynamic-wind
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ieee-floating-point ;conforms to
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full-continuation ;can return multiple times
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; object-hash ;has OBJECT-HASH
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; sort
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; queue ;queues
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pretty-print
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; object->string
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; format
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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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; Xwindows ;X support
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; curses ;screen management package
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; termcap ;terminal description package
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; terminfo ;sysV terminal description
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current-time ;returns time in seconds since 1/1/1970
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))
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(define program-arguments
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(lambda ()
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(vector->list (current-command-line-arguments))))
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(define current-time
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;; Gives time since 1/1/1970 ...
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;; ... GMT for Unix, Windows, and Mac OS X.
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;; ... local time for Mac OS.
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(if (memq (system-type) '(unix macosx windows))
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current-seconds
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(let ([zero (find-seconds 0 0 0 1 1 1970)])
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(lambda ()
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(- (current-seconds) zero)))))
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;;; Remainder is modifications of existing code in Template.scm.
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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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;; Already in MzScheme
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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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;; Already in MzScheme
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;;; (DELETE-FILE <string>)
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;; Already in MzScheme
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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 flush-output)
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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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(define call-with-input-string
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(lambda (string thunk)
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(parameterize ((current-input-port (open-input-string string)))
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(thunk))))
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(define call-with-output-string
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(lambda (receiver)
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(let ((sp (open-output-string)))
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(receiver sp)
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(get-output-string sp))))
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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 #x3FFFFFFF) ; 30 bits on 32-bit machines
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; (define most-positive-fixnum #x3FFFFFFFFFFFFFFF) ; 62 bits on 64-bit machines
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;;; Return argument
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(define (identity x) x)
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;;; If your implementation provides eval SLIB:EVAL is single argument
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;;; 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 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 *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 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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(slib:require 'defmacroexpand)
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(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 an error procedure for the library
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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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(apply error "Error:" args))))
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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+ add1)
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(define -1+ sub1)
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(define 1- -1+)
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(define in-vicinity
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(lambda args
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(let loop ([args args])
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(cond
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[(null? (cdr args)) (car args)]
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[(string=? "" (car args)) (loop (cdr args))]
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[else (let ([v (loop (cdr args))])
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(build-path (car args) v))]))))
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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 exit)
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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 f) (load (string-append f ".zo")))
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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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(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 x cep)) args)
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(newline cep))))
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(slib:load (in-vicinity (library-vicinity) "require"))
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;;; Hack `require' to try to work with both SLIB
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;;; and MzScheme:
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(define slib:require require)
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(define-syntax (require stx)
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(syntax-case stx (quote)
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[_
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(identifier? stx)
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#'slib:require]
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[(_ (quote something))
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#'(slib:require (quote something))]
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[(_ req ...)
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(if (eq? 'top-level (syntax-local-context))
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#'(mz:require req ...)
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#'(slib:require req ...))]))
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;; The rest are from:
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;;;"DrScheme.init" Initialization for SLIB for DrScheme -*-scheme-*-
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;; Friedrich Dominicus <frido@q-software-solutions.com>
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;; Newsgroups: comp.lang.scheme
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;; Date: 02 Oct 2000 09:24:57 +0200
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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? port) (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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