Import Upstream version 3a2upstream/3a2

1 files changed, 133 insertions, 59 deletions

diff --git a/scsh.init b/scsh.init
index 210fd42..82b24d4 100644
--- a/scsh.init
+++ b/scsh.init
@@ -44,62 +44,150 @@
 		home
 		(string-append home "/")))
 	   (else home)))))
-
-;;; *FEATURES* should be set to a list of symbols describing features
-;;; of this implementation.  Suggestions for features are:
+;@
+(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 #f))
+	(dynamic-wind
+	    (lambda () (set! old (exchange path)))
+	    thunk
+	    (lambda () (exchange old)))))))
+
+;;@ *FEATURES* is a list of symbols naming the (SLIB) features
+;;; initially supported by this implementation.
 (define *features*
       '(
 	source				;can load scheme source files
-					;(slib:load-source "filename")
-;	compiled			;can load compiled files
-					;(slib:load-compiled "filename")
+					;(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?
+	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
-;	r3rs				;conforms to
+
 	ieee-p1178			;conforms to
-;	srfi				;srfi-0, COND-EXPAND finds all srfi-*
-;	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!,
+
+;;;	r3rs				;conforms to
+
+;;;	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-TO-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				;proposed 2-arugment eval
-;	record				;has user defined data structures
-	values				;proposed multiple values
-	dynamic-wind			;proposed dynamic-wind
-;	ieee-floating-point		;conforms to
+;;;	object-hash			;has OBJECT-HASH
+
 	full-continuation		;can return multiple times
-;	object-hash			;has OBJECT-HASH
+;;;	ieee-floating-point		;conforms to IEEE Standard 754-1985
+					;IEEE Standard for Binary
+					;Floating-Point Arithmetic.
 
-;	sort
-;	pretty-print
-;	object->string
+			;; 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
-;	trace				;has macros: TRACE and UNTRACE
-;	compiler			;has (COMPILER)
-;	ed				;(ED) is editor
-;	system				;posix (system <string>)
+;;;	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
+;;;	program-arguments		;returns list of strings (argv)
+;;;	current-time			;returns time in seconds since 1/1/1970
+
+		  ;; Implementation Specific features
+
 	))
 
 ;;; (OUTPUT-PORT-WIDTH <port>)
@@ -219,18 +307,7 @@
 
 (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)))))
+;; slib:eval-load definition moved to "require.scm"
 
 (define slib:warn
   (lambda args
@@ -261,10 +338,8 @@
 (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.
+;;; return if exiting not supported.
 (define slib:exit (lambda args #f))
 
 ;;; Here for backward compatability
@@ -295,7 +370,6 @@
 (define transcript-off #f)
 
 (define array? #f)
-(define record? #f)
 (define sort! #f)
 
 (slib:load (in-vicinity (library-vicinity) "require"))