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1992-05-26
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; /ports/emacs/GNU/el3.1 @(#)qui_aux.el 1.1 11/15/90
;;; /ports/home/sitaram/Gnu/qui_emacs/qui_aux.el @(#)qui_aux.el 1.2 11/13/90
;;; Quintus Prolog - GNU Emacs Interface
;;; Support Functions
;;;
;;; Consolidated by Sitaram Muralidhar
;;;
;;; sitaram@quintus.com
;;; Quintus Computer Systems, Inc.
;;; 2 May 1989
;;;
;;; This file defines functions that support the Quintus Prolog - GNU Emacs
;;; interface.
;;;
;;; Acknowledgements
;;;
;;; This interface was made possible by contributions from Fernando
;;; Pereira and various customers of Quintus Computer Systems, Inc.,
;;; based on code for Quintus's Unipress Emacs interface.
;;;
;----------------------------------------------------------------------------
; The following routines are used to properly handle message display
; for the routines which talk to the Emacs interface from Prolog
(defvar *qpmess-buffer* " ")
(defun &qp-message (message)
(setq *qpmess-buffer* message)
)
(defun display-any-messages ()
(if (not (string-equal *qpmess-buffer* ""))
(message *qpmess-buffer*)
)
(sit-for 0)
(&clear-message)
)
(defun &clear-message ()
(setq *qpmess-buffer* "")
)
(defun &no-message ()
(setq *qpmess-buffer* "")
)
(defmacro first-line ()
(save-excursion (beginning-of-line) (bobp)))
(defmacro last-line ()
(save-excursion (end-of-line) (eobp)))
(defun skip-prolog-comment (range)
(let ((current-location (point)))
(if (save-excursion
(beginning-of-line)
(search-forward "%" current-location t))
(progn (skip-prolog-%-comment range) t)
(not (skip-prolog-/*-*/-comment range)))))
(defun skip-prolog-%-comment (range)
"Skip to the beginning or end of a prolog comment depending
on if the range is before or after the point in"
(let* ((forward (> (point) range))
(line-skip (if forward -1 1))
(in-comment t))
(while (and in-comment (not (bobp)) (not (eobp)))
(previous-line line-skip)
(beginning-of-line)
(setq in-comment (= (following-char) ?%)))))
(defun skip-prolog-/*-*/-comment (range)
"Skip to the beginning or end of a prolog comment depending
on if the range is before or after the point in"
(let* ((current-point (point))
(forward (> current-point range)))
(if forward
(if (save-excursion (search-backward "\/*" range t))
(not (search-forward "*\/"))
t)
(if (save-excursion (search-forward "*\/" range t))
(not (search-backward "\/*"))
t))))
(defun beginning-of-clause (&optional arg)
"Move backward to next beginning-of-clause.
With argument, do this that many times.
Returns t unless search stops due to end of buffer."
(interactive "p")
(and arg (< arg 0) (forward-char 1))
(let ((clause-point (point)) (not-done t) (command-point (point)))
(while (and not-done (not (bobp)) (not (eobp)))
(if (and arg (< arg 0))
(skip-chars-forward " \t\n")
(skip-chars-backward " \t\n"))
(if (re-search-backward "^\\S-" nil 'move (or arg 1))
(if (= (following-char) ?%)
(skip-prolog-%-comment clause-point)
(setq not-done (not (skip-prolog-/*-*/-comment clause-point)))))
(setq clause-point (point)))
)
)
(defun end-of-clause (&optional arg)
"Move forward to next end of prolog clause.
An end of a defun is found by moving forward from the beginning of one."
(interactive "p")
(and arg (< arg 0) (forward-char 1))
(let ((clause-point (point)) (not-done t) (command-point (point)))
(while (and not-done (not (bobp)) (not (eobp)))
(re-search-forward "[^.]\\.\\(\\s-\\)*$" nil 'move (or arg 1))
(setq not-done (skip-prolog-comment clause-point))
(setq clause-point (point)))
(if not-done (progn (goto-char command-point) (beep)))))
(defun mark-clause ()
(interactive)
(end-of-clause)
(set-mark (point))
(beginning-of-clause)
(message "Clause marked")
)
(defun kill-clause ()
"Kill the prolog clause that the point in currently in"
(interactive)
(mark-clause)
(kill-region (point) (mark)))