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;;; prolog.el --- major mode for editing and running Prolog under Emacs
;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;; Keywords: languages
;; This file is part of GNU Emacs.
;; GNU Emacs 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 2, or (at your option)
;; any later version.
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This package provides a major mode for editing Prolog. It knows
;; about Prolog syntax and comments, and can send regions to an inferior
;; Prolog interpreter process.
;;; Code:
(defvar prolog-mode-syntax-table nil)
(defvar prolog-mode-abbrev-table nil)
(defvar prolog-mode-map nil)
(defvar prolog-program-name "prolog"
"*Program name for invoking an inferior Prolog with `run-prolog'.")
(defvar prolog-consult-string "reconsult(user).\n"
"*(Re)Consult mode (for C-Prolog and Quintus Prolog). ")
(defvar prolog-compile-string "compile(user).\n"
"*Compile mode (for Quintus Prolog).")
(defvar prolog-eof-string "end_of_file.\n"
"*String that represents end of file for prolog.
nil means send actual operating system end of file.")
(defvar prolog-indent-width 4)
(if prolog-mode-syntax-table
()
(let ((table (make-syntax-table)))
(modify-syntax-entry ?_ "w" table)
(modify-syntax-entry ?\\ "\\" table)
(modify-syntax-entry ?/ "." table)
(modify-syntax-entry ?* "." table)
(modify-syntax-entry ?+ "." table)
(modify-syntax-entry ?- "." table)
(modify-syntax-entry ?= "." table)
(modify-syntax-entry ?% "<" table)
(modify-syntax-entry ?\n ">" table)
(modify-syntax-entry ?< "." table)
(modify-syntax-entry ?> "." table)
(modify-syntax-entry ?\' "\"" table)
(setq prolog-mode-syntax-table table)))
(define-abbrev-table 'prolog-mode-abbrev-table ())
(defun prolog-mode-variables ()
(set-syntax-table prolog-mode-syntax-table)
(setq local-abbrev-table prolog-mode-abbrev-table)
(make-local-variable 'paragraph-start)
(setq paragraph-start (concat "%%\\|$\\|" page-delimiter)) ;'%%..'
(make-local-variable 'paragraph-separate)
(setq paragraph-separate paragraph-start)
(make-local-variable 'paragraph-ignore-fill-prefix)
(setq paragraph-ignore-fill-prefix t)
(make-local-variable 'indent-line-function)
(setq indent-line-function 'prolog-indent-line)
(make-local-variable 'comment-start)
(setq comment-start "%")
(make-local-variable 'comment-start-skip)
(setq comment-start-skip "%+ *")
(make-local-variable 'comment-column)
(setq comment-column 48)
(make-local-variable 'comment-indent-function)
(setq comment-indent-function 'prolog-comment-indent))
(defun prolog-mode-commands (map)
(define-key map "\t" 'prolog-indent-line)
(define-key map "\e\C-x" 'prolog-consult-region))
(if prolog-mode-map
nil
(setq prolog-mode-map (make-sparse-keymap))
(prolog-mode-commands prolog-mode-map))
;;;###autoload
(defun prolog-mode ()
"Major mode for editing Prolog code for Prologs.
Blank lines and `%%...' separate paragraphs. `%'s start comments.
Commands:
\\{prolog-mode-map}
Entry to this mode calls the value of `prolog-mode-hook'
if that value is non-nil."
(interactive)
(kill-all-local-variables)
(use-local-map prolog-mode-map)
(setq major-mode 'prolog-mode)
(setq mode-name "Prolog")
(prolog-mode-variables)
(run-hooks 'prolog-mode-hook))
(defun prolog-indent-line (&optional whole-exp)
"Indent current line as Prolog code.
With argument, indent any additional lines of the same clause
rigidly along with this one (not yet)."
(interactive "p")
(let ((indent (prolog-indent-level))
(pos (- (point-max) (point))) beg)
(beginning-of-line)
(setq beg (point))
(skip-chars-forward " \t")
(if (zerop (- indent (current-column)))
nil
(delete-region beg (point))
(indent-to indent))
(if (> (- (point-max) pos) (point))
(goto-char (- (point-max) pos)))
))
(defun prolog-indent-level ()
"Compute prolog indentation level."
(save-excursion
(beginning-of-line)
(skip-chars-forward " \t")
(cond
((looking-at "%%%") 0) ;Large comment starts
((looking-at "%[^%]") comment-column) ;Small comment starts
((bobp) 0) ;Beginning of buffer
(t
(let ((empty t) ind more less)
(if (looking-at ")")
(setq less t) ;Find close
(setq less nil))
;; See previous indentation
(while empty
(forward-line -1)
(beginning-of-line)
(if (bobp)
(setq empty nil)
(skip-chars-forward " \t")
(if (not (or (looking-at "%[^%]") (looking-at "\n")))
(setq empty nil))))
(if (bobp)
(setq ind 0) ;Beginning of buffer
(setq ind (current-column))) ;Beginning of clause
;; See its beginning
(if (looking-at "%%[^%]")
ind
;; Real prolog code
(if (looking-at "(")
(setq more t) ;Find open
(setq more nil))
;; See its tail
(end-of-prolog-clause)
(or (bobp) (forward-char -1))
(cond ((looking-at "[,(;>]")
(if (and more (looking-at "[^,]"))
(+ ind prolog-indent-width) ;More indentation
(max tab-width ind))) ;Same indentation
((looking-at "-") tab-width) ;TAB
((or less (looking-at "[^.]"))
(max (- ind prolog-indent-width) 0)) ;Less indentation
(t 0)) ;No indentation
)))
)))
(defun end-of-prolog-clause ()
"Go to end of clause in this line."
(beginning-of-line 1)
(let* ((eolpos (save-excursion (end-of-line) (point))))
(if (re-search-forward comment-start-skip eolpos 'move)
(goto-char (match-beginning 0)))
(skip-chars-backward " \t")))
(defun prolog-comment-indent ()
"Compute prolog comment indentation."
(cond ((looking-at "%%%") 0)
((looking-at "%%") (prolog-indent-level))
(t
(save-excursion
(skip-chars-backward " \t")
;; Insert one space at least, except at left margin.
(max (+ (current-column) (if (bolp) 0 1))
comment-column)))
))
;;;
;;; Inferior prolog mode
;;;
(defvar inferior-prolog-mode-map nil)
(defun inferior-prolog-mode ()
"Major mode for interacting with an inferior Prolog process.
The following commands are available:
\\{inferior-prolog-mode-map}
Entry to this mode calls the value of `prolog-mode-hook' with no arguments,
if that value is non-nil. Likewise with the value of `comint-mode-hook'.
`prolog-mode-hook' is called after `comint-mode-hook'.
You can send text to the inferior Prolog from other buffers
using the commands `send-region', `send-string' and \\[prolog-consult-region].
Commands:
Tab indents for Prolog; with argument, shifts rest
of expression rigidly with the current line.
Paragraphs are separated only by blank lines and '%%'.
'%'s start comments.
Return at end of buffer sends line as input.
Return not at end copies rest of line to end and sends it.
\\[comint-kill-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
\\[comint-interrupt-subjob] interrupts the shell or its current subjob if any.
\\[comint-stop-subjob] stops. \\[comint-quit-subjob] sends quit signal."
(interactive)
(require 'comint)
(comint-mode)
(setq major-mode 'inferior-prolog-mode
mode-name "Inferior Prolog"
comint-prompt-regexp "^| [ ?][- ] *")
(prolog-mode-variables)
(if inferior-prolog-mode-map nil
(setq inferior-prolog-mode-map (copy-keymap comint-mode-map))
(prolog-mode-commands inferior-prolog-mode-map))
(use-local-map inferior-prolog-mode-map)
(run-hooks 'prolog-mode-hook))
;;;###autoload
(defun run-prolog ()
"Run an inferior Prolog process, input and output via buffer *prolog*."
(interactive)
(require 'comint)
(switch-to-buffer (make-comint "prolog" prolog-program-name))
(inferior-prolog-mode))
(defun prolog-consult-region (compile beg end)
"Send the region to the Prolog process made by \"M-x run-prolog\".
If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
(interactive "P\nr")
(save-excursion
(if compile
(send-string "prolog" prolog-compile-string)
(send-string "prolog" prolog-consult-string))
(send-region "prolog" beg end)
(send-string "prolog" "\n") ;May be unnecessary
(if prolog-eof-string
(send-string "prolog" prolog-eof-string)
(process-send-eof "prolog")))) ;Send eof to prolog process.
(defun prolog-consult-region-and-go (compile beg end)
"Send the region to the inferior Prolog, and switch to *prolog* buffer.
If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
(interactive "P\nr")
(prolog-consult-region compile beg end)
(switch-to-buffer "*prolog*"))
;;; prolog.el ends here
|
