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;;;;;
;;;;; $Id$
;;;;; Copyright (C) 1991  Lysator Academic Computer Association.
;;;;;
;;;;; This file is part of the LysKOM server.
;;;;; 
;;;;; LysKOM is free software; you can redistribute it and/or modify it
;;;;; under the terms of the GNU General Public License as published by 
;;;;; the Free Software Foundation; either version 1, or (at your option) 
;;;;; any later version.
;;;;; 
;;;;; LysKOM is distributed in the hope that it will be useful, but WITHOUT
;;;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;;;;; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
;;;;; for more details.
;;;;; 
;;;;; You should have received a copy of the GNU General Public License
;;;;; along with LysKOM; see the file COPYING.  If not, write to
;;;;; Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
;;;;; or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
;;;;; MA 02139, USA.
;;;;;
;;;;; Please mail bug reports to bug-lyskom@lysator.liu.se. 
;;;;;
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;;;; ================================================================
;;;; ================================================================
;;;;
;;;; File: macros.el
;;;;
;;;; This file contains the macros which must be loaded before lyskom can
;;;; be compiled.
;;;;

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(defconst lyskom-clientversion-long "$Id$\n"
  "Version for every file in the client.")


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;;; lyskom-traverse - traverse a sequence.

(defmacro lyskom-traverse (atom sequence &rest body)
  "Bind ATOM to each element in SEQUENCE and execute BODY.
Value returned is always nil."
  (list 'let* (list '(__i__ 0)
		    (list '__sequence__ sequence)
		    '(__len__ (length __sequence__))
		    atom)
	(list 'if '(listp __sequence__)
	      (append (list 'while '__sequence__
			    (list 'setq atom '(car __sequence__)))
		      body
		      (list '(setq __sequence__ (cdr __sequence__))))
	      (append (list 'while '(< __i__ __len__)
			    (list 'setq atom '(aref __sequence__ __i__)))
		      body
		      (list '(setq __i__ (1+ __i__)))))))


;;;; lyskom-save-excursion Does not save point and mark.

(defmacro lyskom-save-excursion (&rest forms)
  "Save-excursion without saving point and mark."
  (list 'let (list '(__buffer__ (current-buffer)))
	(list 'unwind-protect
	      (cons 'progn
		    forms)
	      '(set-buffer __buffer__))))


;;;; Some useful macros to make the code more readable.

(defmacro char-in-string (char string)
  "Return t if the character CHAR is member of STRING. Otherwise return nil."
  (list 'null
	(list 'not
	      (list 'string-match
		    (list 'regexp-quote
			  (list 'char-to-string char))
		    string))))

(defmacro ++ (var)
  "Increment the variable VAR and return the value."
  (list 'setq var (list '1+ var)))

(defmacro -- (var)
  "Decrement the variable VAR and return the value."
  (list 'setq var (list '1- var)))
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;; Multiple blocking read from server

(defvar lyskom-multiple-blocking-return nil
  "Return from blocking-do-multiple")

(defun lyskom-blocking-do-multiple (call-list)
  (let ((lyskom-multiple-blocking-return 'not-yet-gotten))
    (lyskom-collect 'blocking)
    (while call-list
      (apply (intern-soft (concat "initiate-"
				  (symbol-name (car (car call-list)))))
	     'blocking nil
	     (cdr (car call-list)))
      (setq call-list (cdr call-list)))
    (lyskom-use 'blocking 'lyskom-blocking-do-multiple-1)
    (while (eq lyskom-multiple-blocking-return 'not-yet-gotten)
      (accept-process-output))
    lyskom-multiple-blocking-return))

(defun lyskom-blocking-do-multiple-1 (&rest data)
  (setq lyskom-multiple-blocking-return data))

(defmacro blocking-do-multiple (bind-list &rest body)
  "Bind variables according to BIND-LIST and then eval BODY.
The value of the last form in BODY is returned.
Each element in BIND-LIST is a list (SYMBOL FORM) which binds SYMBOL to
the result of the server call FORM, which is the same as used in blocking-do.
All the forms in BIND-LIST are evaluated before and symbols are bound."
  (let ((bindsym 'multiple-bind-sym)
	(index 0))
    (` (let (((, bindsym)
	      (lyskom-blocking-do-multiple
	       (list (,@ (mapcar (function (lambda (x) 
					     (` (list '(, (car (car (cdr x))))
						      (,@ (cdr (car (cdr x))))))))
			   bind-list))))))
	 (let ((,@ (mapcar (function 
			    (lambda (bpat)
			      (prog1
				  (` ((, (car bpat))
				      (elt (, bindsym) (, index))))
				(setq index (1+ index)))))
			   bind-list)))
	   (,@ body))))))


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;;; Local Variables: 
;;; eval: (put 'lyskom-traverse 'lisp-indent-hook 2)
;;; end: