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+;;; "jscheme.init" SLIB Initialization for JScheme -*-scheme-*-
+;;; Author: Aubrey Jaffer
+;;; Additions by Ken Anderson.
+;;; This code is in the public domain.
+
+;;; JScheme support of for the SLIB Scheme library.
+
+;;; The easiest way to get things going is to download the slib.zip to
+;;; the lib directory and invoke JScheme with a script like this (UNIX):
+
+;;; java -classpath "lib/jscheme.jar:lib/slib.zip" jscheme.REPL slib/jscheme.init "$@"
+
+;;; AGJ: This line works on my RedHat-9.0 system:
+;;; java -cp src:/usr/local/share/java/jscheme.jar:/usr/local/lib/slib jscheme.REPL jscheme.init
+
+;;; Alternatively, set the location of the slib directory using the
+;;; -D SCHEME_LIBRARY_PATH=... system property.
+
+;;; Let me know, if there is a problem with a module you'd like to use
+;;; (kanderson@bbn.com).
+
+;;@ (software-type) should be set to the generic operating system type.
+;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
+;; (define (software-type) 'UNIX)
+(define (software-type)
+ (if (.startsWith (System.getProperty "os.name") "Windows")
+ 'MS-DOS
+ 'UNIX))
+
+;;@ (scheme-implementation-type) should return the name of the scheme
+;;; implementation loading this file.
+(define (scheme-implementation-type) 'JScheme)
+
+;;@ (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://jscheme.sourceforge.net")
+
+;;@ (scheme-implementation-version) should return a string describing
+;;; the version the scheme implementation loading this file.
+(define (scheme-implementation-version) "6.2")
+
+;;@ (implementation-vicinity) should be defined to be the pathname of
+;;; the directory where any auxillary files to your Scheme
+;;; implementation reside.
+(define implementation-vicinity
+ (let ((implvic (case (software-type)
+ ((MS-DOS) "C:\\TEMP\\")
+ (else "/tmp/"))))
+ (lambda () implvic)))
+
+(define (getenv path)
+ (define prop (System.getProperty path))
+ (and (not (eq? prop #null)) prop))
+
+(define (slib.zip-on-classpath?)
+ (let loop ((urls (vector->list (.getURLs (Import.getClassLoader)))))
+ (if (null? urls) #f
+ (or (.endsWith (.getFile (car urls)) "slib.zip")
+ (loop (cdr urls))))))
+
+;;@ (library-vicinity) should be defined to be the pathname of the
+;;; directory where files of Scheme library functions reside.
+(define library-vicinity
+ (let ((library-path
+ (or
+ ;; Use this getenv if your implementation supports it.
+ (getenv "SCHEME_LIBRARY_PATH")
+ (and (or (slib.zip-on-classpath?)
+ (not (eq? #null (Scheme.openResource "slib/require.scm"))))
+ "slib/")
+ ;; Use this path if your scheme does not support GETENV
+ ;; or if SCHEME_LIBRARY_PATH is not set.
+ (case (software-type)
+ ((UNIX) "/usr/local/lib/slib/")
+ ((VMS) "lib$scheme:")
+ ((MS-DOS) "C:\\SLIB\\")
+ (else "")))))
+ (lambda () library-path)))
+
+;;@ (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)
+ (define home (or (getenv "HOME") (getenv "user.home")))
+ (and home
+ (case (software-type)
+ ((UNIX COHERENT MS-DOS) ;V7 unix has a / on HOME
+ (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
+ home
+ (string-append home "/")))
+ (else home))))
+;@
+(define in-vicinity string-append)
+;@
+(define (user-vicinity)
+ (case (software-type)
+ ((VMS) "[.]")
+ (else "")))
+
+(define *load-pathname* #f)
+;@
+(define vicinity:suffix?
+ (let ((suffi
+ (case (software-type)
+ ((AMIGA) '(#\: #\/))
+ ((MACOS THINKC) '(#\:))
+ ((MS-DOS WINDOWS ATARIST OS/2) '(#\\ #\/))
+ ((NOSVE) '(#\: #\.))
+ ((UNIX COHERENT PLAN9) '(#\/))
+ ((VMS) '(#\: #\]))
+ (else
+ (slib:warn "require.scm" 'unknown 'software-type (software-type))
+ "/"))))
+ (lambda (chr) (and (memv chr suffi) #t))))
+;@
+(define (pathname->vicinity pathname)
+ (let loop ((i (- (string-length pathname) 1)))
+ (cond ((negative? i) "")
+ ((vicinity:suffix? (string-ref pathname i))
+ (substring pathname 0 (+ i 1)))
+ (else (loop (- i 1))))))
+(define (program-vicinity)
+ (if *load-pathname*
+ (pathname->vicinity *load-pathname*)
+ (slib:error 'program-vicinity " called; use slib:load to load")))
+;@
+(define sub-vicinity
+ (case (software-type)
+ ((VMS) (lambda
+ (vic name)
+ (let ((l (string-length vic)))
+ (if (or (zero? (string-length vic))
+ (not (char=? #\] (string-ref vic (- l 1)))))
+ (string-append vic "[" name "]")
+ (string-append (substring vic 0 (- l 1))
+ "." name "]")))))
+ (else (let ((*vicinity-suffix*
+ (case (software-type)
+ ((NOSVE) ".")
+ ((MACOS THINKC) ":")
+ ((MS-DOS WINDOWS ATARIST OS/2) "\\")
+ ((UNIX COHERENT PLAN9 AMIGA) "/"))))
+ (lambda (vic name)
+ (string-append vic name *vicinity-suffix*))))))
+;@
+(define (make-vicinity <pathname>) <pathname>)
+;@
+(define with-load-pathname
+ (let ((exchange
+ (lambda (new)
+ (let ((old *load-pathname*))
+ (set! *load-pathname* new)
+ old))))
+ (lambda (path thunk)
+ (let* ((old (exchange path))
+ (val (thunk)))
+ (exchange old)
+ val))))
+
+;;@ *FEATURES* should be set to a list of symbols describing features
+;;; of this implementation. Suggestions for features are:
+(define *features*
+ '(
+ source ;can load scheme source files
+ ;(SLIB:LOAD-SOURCE "filename")
+;;; compiled ;can load compiled files
+ ;(SLIB:LOAD-COMPILED "filename")
+ vicinity
+ srfi-59
+
+ ;; Scheme report features
+ ;; R5RS-compliant implementations should provide all 9 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?
+;;; KRA 23DEC03: JScheme is missing: vector-fill! string-copy string-fill!
+;;; rev4-optional-procedures ;LIST-TAIL, STRING-COPY,
+ ;STRING-FILL!, and VECTOR-FILL!
+
+ ;; These four features are optional in both R4RS and R5RS
+
+;;; multiarg/and- ;/ and - can take more than 2 args.
+;;; rationalize
+;;; transcript ;TRANSCRIPT-ON and TRANSCRIPT-OFF
+;;; with-file ;has WITH-INPUT-FROM-FILE and
+ ;WITH-OUTPUT-TO-FILE
+
+ 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
+
+;;; full-continuation ;can return multiple times
+ ieee-floating-point ;conforms to IEEE Standard 754-1985
+ ;IEEE Standard for Binary
+ ;Floating-Point Arithmetic.
+
+ ;; 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
+ (let ((port (current-output-port)))
+ (lambda () port)))
+
+;;@ (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>)
+;;; KRA 24DEC03: This allows load to find a file, resource or URL, but
+;;; the rest of SLIB assumes f names a file.
+(define (file-exists? f) (not (eq? (Scheme.open f) #null)))
+;;;(define (file-exists? f) (.exists (java.io.File. f)))
+
+;;@ (DELETE-FILE <string>)
+(define (delete-file f) (.delete (java.io.File. f)))
+
+;;@ 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)
+ (.flush (if (pair? arg) (car args)
+ (current-output-port))))
+
+;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
+;;; port versions of CALL-WITH-*PUT-FILE.
+
+;;@ "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 char-code-limit (char->integer Character.MAX_VALUE$))
+
+;;@ MOST-POSITIVE-FIXNUM is used in modular.scm
+(define most-positive-fixnum Integer.MAX_VALUE$)
+
+;;@ 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:
+;(define macro:eval slib:eval)
+;(define macro:load load)
+
+(define (constant? exp)
+ (if (pair? exp) (eq? (car exp) 'quote) (not (symbol? exp))))
+
+(define (combine-skeletons left right exp)
+ (cond
+ ((and (constant? left) (constant? right))
+ (if (and (eqv? (eval left) (car exp))
+ (eqv? (eval right) (cdr exp)))
+ (list 'quote exp)
+ (list 'quote (cons (eval left) (eval right)))))
+ ((null? right) (list 'list left))
+ ((and (pair? right) (eq? (car right) 'list))
+ (cons 'list (cons left (cdr right))))
+ (else (list 'cons left right))))
+
+(define (expand-quasiquote exp nesting)
+ (cond
+ ((vector? exp)
+ (list 'apply 'vector (expand-quasiquote (vector->list exp) nesting)))
+ ((not (pair? exp))
+ (if (constant? exp) exp (list 'quote exp)))
+ ((and (eq? (car exp) 'unquote) (= (length exp) 2))
+ (if (= nesting 0)
+ (second exp)
+ (combine-skeletons ''unquote
+ (expand-quasiquote (cdr exp) (- nesting 1))
+ exp)))
+ ((and (eq? (car exp) 'quasiquote) (= (length exp) 2))
+ (combine-skeletons ''quasiquote
+ (expand-quasiquote (cdr exp) (+ nesting 1))
+ exp))
+ ((and (pair? (car exp))
+ (eq? (caar exp) 'unquote-splicing)
+ (= (length (car exp)) 2))
+ (if (= nesting 0)
+ (list 'append (second (first exp))
+ (expand-quasiquote (cdr exp) nesting))
+ (combine-skeletons (expand-quasiquote (car exp) (- nesting 1))
+ (expand-quasiquote (cdr exp) nesting)
+ exp)))
+ (else (combine-skeletons (expand-quasiquote (car exp) nesting)
+ (expand-quasiquote (cdr exp) nesting)
+ exp))))
+
+(define quasiquote
+ (set-procedure-name!
+ (macro (x)
+ (expand-quasiquote x 0))
+ 'quasiquote))
+
+(define-macro (defmacro name args . body)
+ `(define-macro ,(cons name args) ,@body))
+;@
+(define (defmacro? m)
+ (and (.isDefined m) (eq? (.getClass (eval m)) Macro.class)))
+;@
+
+(tryCatch ; once-only
+ macroexpand-1
+ (lambda (e) (set! macroexpand-1 macroexpand)))
+
+;@
+(define (macroexpand e)
+ (if (pair? e)
+ (let ((a (car e)))
+ (cond ((and (symbol? a) (defmacro? a))
+ (macroexpand (macroexpand-1 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:eval base:eval)
+
+(define (defmacro:expand* x)
+ (require 'defmacroexpand) (apply defmacro:expand* x '()))
+;@
+(define (defmacro:load <pathname>)
+ (slib:eval-load <pathname> defmacro:eval))
+;; slib:eval-load definition moved to "require.scm"
+
+;@
+(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 error args))
+;@
+(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 end) (zero? (system (string-append cmd url end))))
+ (or (try "netscape-remote -remote 'openURL(" ")'")
+ (try "netscape -remote 'openURL(" ")'")
+ (try "netscape '" "'&")
+ (try "netscape '" "'")))
+
+;;@ 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 SLIB:EXIT to be the implementation procedure to exit or
+;;; return if exiting not supported.
+(define (slib:exit) (System.exit 0))
+
+;;@ 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)
+
+(slib:load (in-vicinity (library-vicinity) "require"))
+
+(define (current-time) (/ (System.currentTimeMillis) 1000))
+
+(if (not (.isDefined 'old-require))
+ (begin
+ (set! old-require require)
+ (set! require
+ (lambda (feature)
+ (let ((jsyntax U.useJavaSyntax$))
+ (set! U.useJavaSyntax$ #f)
+ (Procedure.tryFinally
+ (lambda () (old-require feature))
+ (lambda () (set! U.useJavaSyntax$ jsyntax))))))))