;;; -*-  Mode: Lisp; Package: Maxima; Syntax: Common-Lisp; Base: 10 -*- ;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;     The data in this file contains enhancments.                    ;;;;;
;;;                                                                    ;;;;;
;;;  Copyright (c) 1984,1987 by William Schelter,University of Texas   ;;;;;
;;;     All rights reserved                                            ;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;     (c) Copyright 1981 Massachusetts Institute of Technology         ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(in-package :maxima)

(macsyma-module mformt)

(load-macsyma-macros mforma)

(setf (get '|| 'mformat-ops) nil)
(setf (get '|| 'mformat-state-vars) nil)

(defmacro def-mformat-op (char &rest body)
  `(+def-mformat-op ,'|| ,char ,@body))

(defmacro def-mformat-var (var val init)
  `(+def-mformat-var ,'|| ,var ,val ,init))

(defmacro mformat-loop (&rest endcode)
  `(+mformat-loop ,'|| ,@endcode))

(def-mformat-var |:-FLAG| nil t)
(def-mformat-var |@-FLAG| nil t)
(def-mformat-var parameter 0 t)	; Who can read "~33,34,87A" ?
(def-mformat-var parameter-p nil t)
(def-mformat-var text nil nil)
(def-mformat-var text-temp nil nil)
(def-mformat-var displa-p nil nil)
(def-mformat-var pre-%-p nil nil)
(def-mformat-var post-%-p nil nil)

(defmacro push-text-temp ()
  '(when text-temp
     (push (cons '(text-string) (nreverse text-temp)) text)
     (setq text-temp nil)))

(defmacro output-text ()
  '(progn
    (push-text-temp)
    (output-text* stream text displa-p pre-%-p post-%-p)
    (setq text nil
     displa-p nil
     pre-%-p nil
     post-%-p nil)))

(def-mformat-op (#\% #\&)
    (cond ((or text text-temp) ;; there is text to output.
	   (setq post-%-p t)
	   (output-text))
	  (t
	   (setq pre-%-p t))))

(def-mformat-op #\M
    (push-text-temp)
  (let ((arg (pop-mformat-arg)))
    (and |@-FLAG| (atom arg) 
	 (setq arg (or (get arg 'op) arg)))
    (cond (|:-FLAG|
	   (push (cons '(text-string) (mstring arg)) text))
	  (t
	   (setq displa-p t)
	   (push arg text)))))

(def-mformat-op #\A
    (push-text-temp)
  (push (cons '(text-string) (exploden (pop-mformat-arg))) text))

(def-mformat-op #\S
    (push-text-temp)
  (push (cons '(text-string)
	      (mapl #'(lambda (c)
			(rplaca c (getcharn (car c) 1)))
		    (explode (pop-mformat-arg))))
	text))

(defmfun mformat n
  (unless (> n 1)
    ;; make error message without new symbols.
    ;; This error should not happen in compiled code because
    ;; this check is done at compile time too.
    (maxima-error "MFORMAT: expected two or more arguments."))
  (let* ((stream (arg 1))
	 (sstring (exploden (arg 2)))
	 (arg-index 2))
    (when (or (null stream) (eq t stream))
      (setq stream *standard-output*))
    ;; This is all done via macros to save space,
    ;; (No functions, no special variable symbols.)
    ;; If the lack of flexibilty becomes an issue then
    ;; it can be changed easily.
    (mformat-loop (output-text))
    ;; Keep from getting bitten by buffering.
    (force-output stream)))

;;can't change mformat since there are various places where stream = nil means
;; standard output not a string  
;;note: compile whole file, incremental compiling will not work.

;; AFORMAT
;;
;; Basically the same as MFORMAT, which is a "souped-up" FORMAT implementation
;; with support for the ~M control string. However, unlike MFORMAT, when
;; DESTINATION is NIL, the function writes its result to a string.
(defmfun aformat (destination control-string &rest arguments)
  (if destination
      (apply 'mformat destination control-string arguments)
      (with-output-to-string (st)
			     (let ((*standard-output* st))
			       (apply 'mformat t control-string arguments)))))

(defun output-text* (stream text displa-p pre-%-p post-%-p)
  (setq text (nreverse text))
  ;; outputs a META-LINE of text.
  (cond (displa-p (displaf (cons '(mtext) text) stream))
	(t
	 (if pre-%-p (terpri stream))
	 (do ()
	     ((null text))
	   (do ((l (cdr (pop text)) (cdr l)))
	       ((null l))
	     (write-char (car l) stream)))
	 (if post-%-p (terpri stream)))))

(defun-prop (text-string dimension) (form result)
  (dimension-atom (maknam (cdr form)) result))

(defmfun displaf (object stream)
  ;; for DISPLA to a file.
  (if (or (eq stream nil) (eq stream *standard-output*))
      (displa object)
      (let ((*standard-output* stream)
	    (#.ttyoff t))
	(displa object))))

(defmfun mtell (&rest l)
  (apply #'mformat nil l))
