;;; ****************************************************************
;;; OPS5 Interpreter ***********************************************
;;; ****************************************************************
;;; This Common Lisp version of OPS5 is in the public domain. It is based
;;; in part on based on a Franz Lisp implementation done by Charles L. Forgy
;;; at Carnegie-Mellon University, which was placed in the public domain by
;;; the author in accordance with CMU policies. Ported to Common Lisp by
;;; George Wood and Jim Kowalski. CMU Common Lisp modifications by
;;; Dario Guise, Skef Wholey, Michael Parzen, and Dan Kuokka.
;;; Modified to work in CLtL1, CLtL2 and X3J13 compatible lisps by
;;; Mark Kantrowitz on 14-OCT-92.
;;;
;;; This code is made available is, and without warranty of any kind by the
;;; authors or by Carnegie-Mellon University.
;;;
;;;; This file contains all the functions pertaining to I/O.
(in-package "OPS")
;; (shadow '(write)) ; Should get this by requiring ops-rhs
;;; Internal global variables.
(defvar *write-file* nil)
(defvar *trace-file* nil)
(defvar *accept-file* nil)
(defvar *ppline* nil)
(defvar *filters* nil)
;;; Initialization
(defun io-init ()
(setq *write-file* nil)
(setq *trace-file* nil)
(setq *accept-file* nil))
;;; User I/O commands
;;; Dario Giuse - rewrote the (write) function to follow OPS-5 specifications.
;;; Michael Huhns fixed a few bugs in this rewrttien functions some years later.
;;; used only in this file.
(defmacro append-string (x)
`(setq wrstring (concatenate 'simple-string wrstring ,x)))
(defun ops-write (z)
(if (not *in-rhs*)
(%warn '|cannot be called at top level| 'write)
(prog (port max k x)
($reset)
(eval-args z)
(setq max ($parametercount))
(when (< max 1)
(%warn '|write: nothing to print| z)
(return nil))
(setq x ($parameter 1))
(cond ((and (symbolp x) ($ofile x))
(setq port ($ofile x))
(setq k 2))
(t
(setq port (default-write-file))
(setq k 1)))
;; Analyze and output all the parameters (write) was passed.
(do* ((wrstring "")
(x ($parameter k) ($parameter k))
(field-width))
((> k max)
(format port wrstring)
(force-output)) ; Dario Giuse - added to force output
(incf k)
(case x
(|=== C R L F ===|
(format port "~A~%" wrstring) ; Flush the previous line
(setq wrstring ""))
(|=== R J U S T ===|
(setq field-width ($parameter k)) ; Number following (tabto)
(incf k)
(setq x (format nil "~A" ($parameter k))) ; Next field to print
(when (<= (length x) field-width)
;; Right-justify field
(append-string (format nil "~V@A" field-width x))
(incf k))) ; Skip next field, since we printed it already
(|=== T A B T O ===|
(setq x ($parameter k)) ; Position to tab to
(incf k)
(when (< x (length wrstring))
;; Flush line, start a new one
(format port "~A~%" wrstring)
(setq wrstring ""))
(append-string (format nil "~V,1@T" (- x (length wrstring) 1))))
(t
(append-string (format nil "~A " x))))))))
(defun ops-openfile (z)
(prog (file mode id)
($reset)
(eval-args z)
(cond ((not (equal ($parametercount) 3.))
(%warn '|openfile: wrong number of arguments| z)
(return nil)))
(setq id ($parameter 1))
(setq file ($parameter 2))
(setq mode ($parameter 3))
(cond ((not (symbolp id))
(%warn '|openfile: file id must be a symbolic atom| id)
(return nil))
((null id)
(%warn '|openfile: 'nil' is reserved for the terminal| nil)
(return nil))
((or ($ifile id)($ofile id))
(%warn '|openfile: name already in use| id)
(return nil)))
;;@@@ (cond ((eq mode 'in) (setf (gethash id *inputfile-table*) (infile file)))
;;@@@ ((eq mode 'out) (setf (gethash id *outputfile-table*) (outfile file)))
;; dec 7 83 gdw added setq : is putprop needed ? )
(cond ((eq mode 'in) (setf (gethash id *inputfile-table*)
(setq id (infile file))))
((eq mode 'out) (setf (gethash id *outputfile-table*)
(setq id (outfile file))))
(t (%warn '|openfile: illegal mode| mode)
(return nil)))
(return nil)))
(defun infile (f_name)
(open f_name :direction :input))
(defun outfile (f_name)
(open f_name :direction :output :if-exists :new-version))
(defun ops-closefile (z)
($reset)
(eval-args z)
(mapc #'closefile2 (use-result-array)))
(defun closefile2 (file)
(let (port)
(cond ((not (symbolp file))
(%warn '|closefile: illegal file identifier| file))
((setq port ($ifile file))
(close port)
(remhash file *inputfile-table*))
((setq port ($ofile file))
(close port)
(remhash file *outputfile-table*)))
nil))
(defun ops-default (z)
(prog (file use)
($reset)
(eval-args z)
(cond ((not (equal ($parametercount) 2.))
(%warn '|default: wrong number of arguments| z)
(return nil)))
(setq file ($parameter 1))
(setq use ($parameter 2))
(cond ((not (symbolp file))
(%warn '|default: illegal file identifier| file)
(return nil))
((not (member use '(write accept trace) :test #'equal))
(%warn '|default: illegal use for a file| use)
(return nil))
((and (member use '(write trace) :test #'equal)
(not (null file))
(not ($ofile file)))
(%warn '|default: file has not been opened for output| file)
(return nil))
((and (equal use 'accept)
(not (null file))
(not ($ifile file)))
(%warn '|default: file has not been opened for input| file)
(return nil))
((equal use 'write) (setq *write-file* file))
((equal use 'accept) (setq *accept-file* file))
((equal use 'trace) (setq *trace-file* file)))
(return nil)))
(defun ops-accept (z)
(prog (port arg)
(cond ((> (length z) 1.)
(%warn '|accept: wrong number of arguments| z)
(return nil)))
(setq port *standard-input*)
(cond (*accept-file*
(setq port ($ifile *accept-file*))
(cond ((null port)
(%warn '|accept: file has been closed| *accept-file*)
(return nil)))))
(cond ((= (length z) 1)
(setq arg ($varbind (car z)))
(cond ((not (symbolp arg))
(%warn '|accept: illegal file name| arg)
(return nil)))
(setq port ($ifile arg))
(cond ((null port)
(%warn '|accept: file not open for input| arg)
(return nil)))))
(cond ((equal (peek-char t port nil "eof" ) "eof" )
($value 'end-of-file)
(return nil)))
(flat-value (read port))))
;;; Dario Giuse - completely changed the algorithm. It now uses one read-line
;;; and the read-from-string.
;;;
(defun ops-acceptline (z)
(let ((port *standard-input*)
(def z))
(cond (*accept-file*
(setq port ($ifile *accept-file*))
(cond ((null port)
(%warn '|acceptline: file has been closed|
*accept-file*)
(return-from ops-acceptline nil)))))
(cond ((> (length def) 0)
(let ((arg ($varbind (car def))))
(cond ((and (symbolp arg) ($ifile arg))
(setq port ($ifile arg))
(setq def (cdr def)))))))
(let ((line (read-line port nil 'eof)))
(declare (simple-string line))
;; Strip meaningless characters from start and end of string.
(setq line (string-trim '(#\( #\) #\, #\tab #\space) line))
(when (equal line "")
(mapc (function $change) def)
(return-from ops-acceptline nil))
(setq line (concatenate 'simple-string "(" line ")"))
;; Read all items from the line
(flat-value (read-from-string line)))))
(defun ops-rjust (z)
(prog (val)
(when (not (= (length z) 1.))
(%warn '|rjust: wrong number of arguments| z)
(return nil))
(setq val ($varbind (car z)))
(cond ((or (not (numberp val)) (< val 1.) (> val 127.))
(%warn '|rjust: illegal value for field width| val)
(return nil)))
($value '|=== R J U S T ===|)
($value val)))
(defun ops-crlf (z)
(cond (z (%warn '|crlf: does not take arguments| z))
(t ($value '|=== C R L F ===|))))
(defun ops-tabto (z)
(prog (val)
(when (not (= (length z) 1.))
(%warn '|tabto: wrong number of arguments| z)
(return nil))
(setq val ($varbind (car z)))
(cond ((or (not (numberp val)) (< val 1.) (> val 127.))
(%warn '|tabto: illegal column number| z)
(return nil)))
($value '|=== T A B T O ===|)
($value val)))
(defun do-rjust (width value port)
(prog (size)
(cond ((eq value '|=== T A B T O ===|)
(%warn '|rjust cannot precede this function| 'tabto)
(return nil))
((eq value '|=== C R L F ===|)
(%warn '|rjust cannot precede this function| 'crlf)
(return nil))
((eq value '|=== R J U S T ===|)
(%warn '|rjust cannot precede this function| 'rjust)
(return nil)))
;;original-> (setq size (flatc value (1+ width)))
(setq size (min value (1+ width))) ;### KLUGE
(cond ((> size width)
(princ '| | port)
(princ value port)
(return nil)))
;;### (do k (- width size) (1- k) (not (> k 0)) (princ '| | port))
;;^^^KLUGE @@@do
(princ value port)))
(defun do-tabto (col port)
(prog (pos)
;;### KLUGE: FLUSHES STREAM & SETS POS TO 0
;;OIRGINAL-> (setq pos (1+ (nwritn port))) ;hmm-takes 1 arg @@@ port
(finish-output port);kluge
(setq pos 0);kluge
(cond ((> pos col)
(terpri port)
(setq pos 1)))
;;###(do k (- col pos) (1- k) (not (> k 0)) (princ '| | port))
;;^^^KLUGE @@@do
(return nil)))
(defun flat-value (x)
(cond ((atom x) ($value x))
(t (mapc #'flat-value x))))
;;; Printing WM
(defun ops-ppwm (avlist)
(prog (next a)
(setq *filters* nil)
(setq next 1.)
loop (and (atom avlist) (go print))
(setq a (car avlist))
(setq avlist (cdr avlist))
;;this must be expecting (ppwm class ^ attr ^ attr2 ...) not ^attr
(cond ((eq a '^)
(setq next (car avlist))
(setq avlist (cdr avlist))
(setq next ($litbind next))
(and (floatp next) (setq next (floor next)))
(cond ((or (not (numberp next))
(> next *size-result-array*)
(> 1. next))
(%warn '|illegal index after ^| next)
(return nil))))
((variablep a)
(%warn '|ppwm does not take variables| a)
(return nil))
(t (setq *filters* (cons next (cons a *filters*)))
(setq next (1+ next))))
(go loop)
print (mapwm #'ppwm2)
(terpri)
(return nil)))
(defun default-write-file ()
(let ((port *standard-output*))
(when *write-file*
(setq port ($ofile *write-file*))
(when (null port)
(%warn '|write: file has been closed| *write-file*)
(setq port *standard-output*)))
port))
(defun trace-file ()
(let ((port *standard-output*))
(when *trace-file*
(setq port ($ofile *trace-file*))
(when (null port)
(%warn '|trace: file has been closed| *trace-file*)
(setq port *standard-output*)))
port))
(defun ppwm2 (elm-tag)
(cond ((filter (car elm-tag))
(terpri) (ppelm (car elm-tag) (default-write-file)))))
(defun filter (elm)
(prog (fl indx val)
(setq fl *filters*)
top (and (atom fl) (return t))
(setq indx (car fl))
(setq val (cadr fl))
(setq fl (cddr fl))
(and (ident (nth (1- indx) elm) val) (go top))
(return nil)))
(defun ident (x y)
(cond ((eq x y) t)
((not (numberp x)) nil)
((not (numberp y)) nil)
((=alg x y) t)
(t nil)))
;; the new ppelm is designed especially to handle literalize format
;; however, it will do as well as the old ppelm on other formats
(defun ppelm (elm port)
(prog (ppdat sep val att mode lastpos)
(princ (creation-time elm) port)
(princ '|: | port)
(setq mode 'vector)
(setq ppdat (gethash (car elm) *ppdat-table*))
(and ppdat (setq mode 'a-v))
(setq sep "(") ; ")"
(setq lastpos 0)
(do ((curpos 1 (1+ curpos)) (vlist elm (cdr vlist)))
((atom vlist) nil) ; terminate
(setq val (car vlist)) ; tagbody begin
(setq att (assoc curpos ppdat)) ;should ret (curpos attr-name)
(cond (att (setq att (cdr att))) ; att = (attr-name) ??
(t (setq att curpos)))
(and (symbolp att) (is-vector-attribute att) (setq mode 'vector))
(cond ((or (not (null val)) (eq mode 'vector))
(princ sep port)
(ppval val att lastpos port)
(setq sep '| |)
(setq lastpos curpos))))
(princ '|)| port)))
(defun ppval (val att lastpos port)
;; (break "in ppval")
(cond ((not (equal att (1+ lastpos))) ; ok, if we got an att
(princ '^ port)
(princ att port)
(princ '| | port)))
(princ val port))
;;; Printing production memory
(defun ops-pm (z) (mapc #'pprule z) (terpri) nil)
(defun pprule (name)
(prog (matrix next lab)
(and (not (symbolp name)) (return nil))
(setq matrix (gethash name *production-table*))
(and (null matrix) (return nil))
(terpri)
(princ '|(p |) ;)
(princ name)
top (and (atom matrix) (go fin))
(setq next (car matrix))
(setq matrix (cdr matrix))
(setq lab nil)
(terpri)
(cond ((eq next '-)
(princ '| - |)
(setq next (car matrix))
(setq matrix (cdr matrix)))
((eq next '-->)
(princ '| |))
((and (eq next '{) (atom (car matrix)))
(princ '| {|)
(setq lab (car matrix))
(setq next (cadr matrix))
(setq matrix (cdddr matrix)))
((eq next '{)
(princ '| {|)
(setq lab (cadr matrix))
(setq next (car matrix))
(setq matrix (cdddr matrix)))
(t (princ '| |)))
(ppline next)
(cond (lab (princ '| |) (princ lab) (princ '})))
(go top)
fin (princ '|)|)))
(defun ppline (line)
(cond ((atom line) (princ line))
(t
(princ '|(|) ;)
(setq *ppline* line)
(ppline2)
;;(
(princ '|)|)))
nil)
(defun ppline2 ()
(prog (needspace)
(setq needspace nil)
top (and (atom *ppline*) (return nil))
(and needspace (princ '| |))
(cond ((eq (car *ppline*) '^) (ppattval))
(t (pponlyval)))
(setq needspace t)
(go top)))
(defun ppattval ()
(prog (att val)
(setq att (cadr *ppline*))
(setq *ppline* (cddr *ppline*))
(setq val (getval))
;;### (cond ((> (+ (nwritn) (flatc att) (flatc val)) 76.)))
;;@@@ nwritn no arg
;; ;"plus" changed to "+" by gdw
;; (terpri)
;; (princ '| |)
(princ '^)
(princ att)
(mapc (function (lambda (z) (princ '| |) (princ z))) val)))
(defun pponlyval ()
(prog (val needspace)
(setq val (getval))
(setq needspace nil)
;;### (cond ((> (+ (nwritn) (flatc val)) 76.)))
;;"plus" changed to "+" by gdw
;; (setq needspace nil) ;^nwritn no arg @@@
;; (terpri)
;; (princ '| |)
top (and (atom val) (return nil))
(and needspace (princ '| |))
(setq needspace t)
(princ (car val))
(setq val (cdr val))
(go top)))
(defun getval ()
(let ((v1 (pop *ppline*))
res)
(cond ((member v1 '(= <> < <= => > <=>))
(setq res (cons v1 (getval))))
((eq v1 '{)
(setq res (cons v1 (getupto '}))))
((eq v1 '<<)
(setq res (cons v1 (getupto '>>))))
((eq v1 '//)
(setq res (list v1 (car *ppline*)))
(setq *ppline* (cdr *ppline*)))
(t (setq res (list v1))))
res))
(defun getupto (end)
(if (atom *ppline*) nil
(let ((v (pop *ppline*)))
(if (eq v end)
(list v)
(cons v (getupto end))))))
;;; *EOF*