1 ;;; prolog.el --- major mode for editing and running Prolog under Emacs
3 ;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
5 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to
22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 ;; This package provides a major mode for editing Prolog. It knows
27 ;; about Prolog syntax and comments, and can send regions to an inferior
28 ;; Prolog interpreter process.
32 (defvar prolog-mode-syntax-table nil)
33 (defvar prolog-mode-abbrev-table nil)
34 (defvar prolog-mode-map nil)
36 (defvar prolog-program-name "prolog"
37 "*Program name for invoking an inferior Prolog with `run-prolog'.")
39 (defvar prolog-consult-string "reconsult(user).\n"
40 "*(Re)Consult mode (for C-Prolog and Quintus Prolog). ")
42 (defvar prolog-compile-string "compile(user).\n"
43 "*Compile mode (for Quintus Prolog).")
45 (defvar prolog-eof-string "end_of_file.\n"
46 "*String that represents end of file for prolog.
47 nil means send actual operating system end of file.")
49 (defvar prolog-indent-width 4)
51 (if prolog-mode-syntax-table
53 (let ((table (make-syntax-table)))
54 (modify-syntax-entry ?_ "w" table)
55 (modify-syntax-entry ?\\ "\\" table)
56 (modify-syntax-entry ?/ "." table)
57 (modify-syntax-entry ?* "." table)
58 (modify-syntax-entry ?+ "." table)
59 (modify-syntax-entry ?- "." table)
60 (modify-syntax-entry ?= "." table)
61 (modify-syntax-entry ?% "<" table)
62 (modify-syntax-entry ?\n ">" table)
63 (modify-syntax-entry ?< "." table)
64 (modify-syntax-entry ?> "." table)
65 (modify-syntax-entry ?\' "\"" table)
66 (setq prolog-mode-syntax-table table)))
68 (define-abbrev-table 'prolog-mode-abbrev-table ())
70 (defun prolog-mode-variables ()
71 (set-syntax-table prolog-mode-syntax-table)
72 (setq local-abbrev-table prolog-mode-abbrev-table)
73 (make-local-variable 'paragraph-start)
74 (setq paragraph-start (concat "%%\\|$\\|" page-delimiter)) ;'%%..'
75 (make-local-variable 'paragraph-separate)
76 (setq paragraph-separate paragraph-start)
77 (make-local-variable 'paragraph-ignore-fill-prefix)
78 (setq paragraph-ignore-fill-prefix t)
79 (make-local-variable 'indent-line-function)
80 (setq indent-line-function 'prolog-indent-line)
81 (make-local-variable 'comment-start)
82 (setq comment-start "%")
83 (make-local-variable 'comment-start-skip)
84 (setq comment-start-skip "%+ *")
85 (make-local-variable 'comment-column)
86 (setq comment-column 48)
87 (make-local-variable 'comment-indent-function)
88 (setq comment-indent-function 'prolog-comment-indent))
90 (defun prolog-mode-commands (map)
91 (define-key map "\t" 'prolog-indent-line)
92 (define-key map "\e\C-x" 'prolog-consult-region))
96 (setq prolog-mode-map (make-sparse-keymap))
97 (prolog-mode-commands prolog-mode-map))
100 (defun prolog-mode ()
101 "Major mode for editing Prolog code for Prologs.
102 Blank lines and `%%...' separate paragraphs. `%'s start comments.
105 Entry to this mode calls the value of `prolog-mode-hook'
106 if that value is non-nil."
108 (kill-all-local-variables)
109 (use-local-map prolog-mode-map)
110 (setq major-mode 'prolog-mode)
111 (setq mode-name "Prolog")
112 (prolog-mode-variables)
113 (run-hooks 'prolog-mode-hook))
115 (defun prolog-indent-line (&optional whole-exp)
116 "Indent current line as Prolog code.
117 With argument, indent any additional lines of the same clause
118 rigidly along with this one (not yet)."
120 (let ((indent (prolog-indent-level))
121 (pos (- (point-max) (point))) beg)
124 (skip-chars-forward " \t")
125 (if (zerop (- indent (current-column)))
127 (delete-region beg (point))
129 (if (> (- (point-max) pos) (point))
130 (goto-char (- (point-max) pos)))
133 (defun prolog-indent-level ()
134 "Compute prolog indentation level."
137 (skip-chars-forward " \t")
139 ((looking-at "%%%") 0) ;Large comment starts
140 ((looking-at "%[^%]") comment-column) ;Small comment starts
141 ((bobp) 0) ;Beginning of buffer
143 (let ((empty t) ind more less)
145 (setq less t) ;Find close
147 ;; See previous indentation
153 (skip-chars-forward " \t")
154 (if (not (or (looking-at "%[^%]") (looking-at "\n")))
157 (setq ind 0) ;Beginning of buffer
158 (setq ind (current-column))) ;Beginning of clause
160 (if (looking-at "%%[^%]")
164 (setq more t) ;Find open
167 (end-of-prolog-clause)
168 (or (bobp) (forward-char -1))
169 (cond ((looking-at "[,(;>]")
170 (if (and more (looking-at "[^,]"))
171 (+ ind prolog-indent-width) ;More indentation
172 (max tab-width ind))) ;Same indentation
173 ((looking-at "-") tab-width) ;TAB
174 ((or less (looking-at "[^.]"))
175 (max (- ind prolog-indent-width) 0)) ;Less indentation
176 (t 0)) ;No indentation
180 (defun end-of-prolog-clause ()
181 "Go to end of clause in this line."
182 (beginning-of-line 1)
183 (let* ((eolpos (save-excursion (end-of-line) (point))))
184 (if (re-search-forward comment-start-skip eolpos 'move)
185 (goto-char (match-beginning 0)))
186 (skip-chars-backward " \t")))
188 (defun prolog-comment-indent ()
189 "Compute prolog comment indentation."
190 (cond ((looking-at "%%%") 0)
191 ((looking-at "%%") (prolog-indent-level))
194 (skip-chars-backward " \t")
195 ;; Insert one space at least, except at left margin.
196 (max (+ (current-column) (if (bolp) 0 1))
202 ;;; Inferior prolog mode
204 (defvar inferior-prolog-mode-map nil)
206 (defun inferior-prolog-mode ()
207 "Major mode for interacting with an inferior Prolog process.
209 The following commands are available:
210 \\{inferior-prolog-mode-map}
212 Entry to this mode calls the value of `prolog-mode-hook' with no arguments,
213 if that value is non-nil. Likewise with the value of `comint-mode-hook'.
214 `prolog-mode-hook' is called after `comint-mode-hook'.
216 You can send text to the inferior Prolog from other buffers
217 using the commands `send-region', `send-string' and \\[prolog-consult-region].
220 Tab indents for Prolog; with argument, shifts rest
221 of expression rigidly with the current line.
222 Paragraphs are separated only by blank lines and '%%'.
225 Return at end of buffer sends line as input.
226 Return not at end copies rest of line to end and sends it.
227 \\[comint-kill-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
228 \\[comint-interrupt-subjob] interrupts the shell or its current subjob if any.
229 \\[comint-stop-subjob] stops. \\[comint-quit-subjob] sends quit signal."
233 (setq major-mode 'inferior-prolog-mode
234 mode-name "Inferior Prolog"
235 comint-prompt-regexp "^| [ ?][- ] *")
236 (prolog-mode-variables)
237 (if inferior-prolog-mode-map nil
238 (setq inferior-prolog-mode-map (copy-keymap comint-mode-map))
239 (prolog-mode-commands inferior-prolog-mode-map))
240 (use-local-map inferior-prolog-mode-map)
241 (run-hooks 'prolog-mode-hook))
245 "Run an inferior Prolog process, input and output via buffer *prolog*."
248 (switch-to-buffer (make-comint "prolog" prolog-program-name))
249 (inferior-prolog-mode))
251 (defun prolog-consult-region (compile beg end)
252 "Send the region to the Prolog process made by \"M-x run-prolog\".
253 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
257 (send-string "prolog" prolog-compile-string)
258 (send-string "prolog" prolog-consult-string))
259 (send-region "prolog" beg end)
260 (send-string "prolog" "\n") ;May be unnecessary
261 (if prolog-eof-string
262 (send-string "prolog" prolog-eof-string)
263 (process-send-eof "prolog")))) ;Send eof to prolog process.
265 (defun prolog-consult-region-and-go (compile beg end)
266 "Send the region to the inferior Prolog, and switch to *prolog* buffer.
267 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
269 (prolog-consult-region compile beg end)
270 (switch-to-buffer "*prolog*"))
272 ;;; prolog.el ends here