1 ;;; prolog.el --- major mode for editing and running Prolog under Emacs
3 ;; Copyright (C) 1986, 1987, 2001, 2002, 2003, 2004, 2005
4 ;; Free Software Foundation, Inc.
6 ;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp>
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
28 ;; This package provides a major mode for editing Prolog. It knows
29 ;; about Prolog syntax and comments, and can send regions to an inferior
30 ;; Prolog interpreter process. Font locking is tuned towards GNU Prolog.
34 (defvar comint-prompt-regexp
)
38 "Major mode for editing and running Prolog under Emacs."
42 (defcustom prolog-program-name
43 (let ((names '("prolog" "gprolog")))
45 (not (executable-find (car names
))))
46 (setq names
(cdr names
)))
47 (or (car names
) "prolog"))
48 "*Program name for invoking an inferior Prolog with `run-prolog'."
52 (defcustom prolog-consult-string
"reconsult(user).\n"
53 "*(Re)Consult mode (for C-Prolog and Quintus Prolog). "
57 (defcustom prolog-compile-string
"compile(user).\n"
58 "*Compile mode (for Quintus Prolog)."
62 (defcustom prolog-eof-string
"end_of_file.\n"
63 "*String that represents end of file for Prolog.
64 When nil, send actual operating system end of file."
68 (defcustom prolog-indent-width
4
69 "Level of indentation in Prolog buffers."
73 (defvar prolog-font-lock-keywords
74 '(("\\(#[<=]=>\\|:-\\)\\|\\(#=\\)\\|\\(#[#<>\\/][=\\/]*\\|!\\)"
75 0 font-lock-keyword-face
)
76 ("\\<\\(is\\|write\\|nl\\|read_\\sw+\\)\\>"
77 1 font-lock-keyword-face
)
78 ("^\\(\\sw+\\)\\s-*\\((\\(.+\\))\\)*"
79 (1 font-lock-function-name-face
)
80 (3 font-lock-variable-name-face
)))
81 "Font-lock keywords for Prolog mode.")
83 (defvar prolog-mode-syntax-table
84 (let ((table (make-syntax-table)))
85 (modify-syntax-entry ?_
"w" table
)
86 (modify-syntax-entry ?
\\ "\\" table
)
87 (modify-syntax-entry ?
/ ". 14" table
)
88 (modify-syntax-entry ?
* ". 23" table
)
89 (modify-syntax-entry ?
+ "." table
)
90 (modify-syntax-entry ?-
"." table
)
91 (modify-syntax-entry ?
= "." table
)
92 (modify-syntax-entry ?%
"<" table
)
93 (modify-syntax-entry ?
\n ">" table
)
94 (modify-syntax-entry ?
< "." table
)
95 (modify-syntax-entry ?
> "." table
)
96 (modify-syntax-entry ?
\' "\"" table
)
99 (defvar prolog-mode-abbrev-table nil
)
100 (define-abbrev-table 'prolog-mode-abbrev-table
())
102 (defun prolog-mode-variables ()
103 (make-local-variable 'paragraph-separate
)
104 (setq paragraph-separate
(concat "%%\\|$\\|" page-delimiter
)) ;'%%..'
105 (make-local-variable 'paragraph-ignore-fill-prefix
)
106 (setq paragraph-ignore-fill-prefix t
)
107 (make-local-variable 'imenu-generic-expression
)
108 (setq imenu-generic-expression
'((nil "^\\sw+" 0)))
109 (make-local-variable 'indent-line-function
)
110 (setq indent-line-function
'prolog-indent-line
)
111 (make-local-variable 'comment-start
)
112 (setq comment-start
"%")
113 (make-local-variable 'comment-start-skip
)
114 (setq comment-start-skip
"\\(?:%+\\|/\\*+\\)[ \t]*")
115 (make-local-variable 'comment-end-skip
)
116 (setq comment-end-skip
"[ \t]*\\(\n\\|\\*+/\\)")
117 (make-local-variable 'comment-column
)
118 (setq comment-column
48))
120 (defvar prolog-mode-map
121 (let ((map (make-sparse-keymap)))
122 (define-key map
"\e\C-x" 'prolog-consult-region
)
126 (defun prolog-mode ()
127 "Major mode for editing Prolog code for Prologs.
128 Blank lines and `%%...' separate paragraphs. `%'s start comments.
131 Entry to this mode calls the value of `prolog-mode-hook'
132 if that value is non-nil."
134 (kill-all-local-variables)
135 (use-local-map prolog-mode-map
)
136 (set-syntax-table prolog-mode-syntax-table
)
137 (setq major-mode
'prolog-mode
)
138 (setq mode-name
"Prolog")
139 (prolog-mode-variables)
141 (setq font-lock-defaults
'(prolog-font-lock-keywords
144 (run-mode-hooks 'prolog-mode-hook
))
146 (defun prolog-indent-line (&optional whole-exp
)
147 "Indent current line as Prolog code.
148 With argument, indent any additional lines of the same clause
149 rigidly along with this one (not yet)."
151 (let ((indent (prolog-indent-level))
152 (pos (- (point-max) (point))) beg
)
155 (skip-chars-forward " \t")
156 (if (zerop (- indent
(current-column)))
158 (delete-region beg
(point))
160 (if (> (- (point-max) pos
) (point))
161 (goto-char (- (point-max) pos
)))
164 (defun prolog-indent-level ()
165 "Compute Prolog indentation level."
168 (skip-chars-forward " \t")
170 ((looking-at "%%%") 0) ;Large comment starts
171 ((looking-at "%[^%]") comment-column
) ;Small comment starts
172 ((bobp) 0) ;Beginning of buffer
174 (let ((empty t
) ind more less
)
176 (setq less t
) ;Find close
178 ;; See previous indentation
184 (skip-chars-forward " \t")
185 (if (not (or (looking-at "%[^%]") (looking-at "\n")))
188 (setq ind
0) ;Beginning of buffer
189 (setq ind
(current-column))) ;Beginning of clause
191 (if (looking-at "%%[^%]")
195 (setq more t
) ;Find open
198 (end-of-prolog-clause)
199 (or (bobp) (forward-char -
1))
200 (cond ((looking-at "[,(;>]")
201 (if (and more
(looking-at "[^,]"))
202 (+ ind prolog-indent-width
) ;More indentation
203 (max tab-width ind
))) ;Same indentation
204 ((looking-at "-") tab-width
) ;TAB
205 ((or less
(looking-at "[^.]"))
206 (max (- ind prolog-indent-width
) 0)) ;Less indentation
207 (t 0)) ;No indentation
211 (defun end-of-prolog-clause ()
212 "Go to end of clause in this line."
213 (beginning-of-line 1)
214 (let* ((eolpos (save-excursion (end-of-line) (point))))
215 (if (re-search-forward comment-start-skip eolpos
'move
)
216 (goto-char (match-beginning 0)))
217 (skip-chars-backward " \t")))
220 ;;; Inferior prolog mode
222 (defvar inferior-prolog-mode-map
223 (let ((map (make-sparse-keymap)))
224 ;; This map will inherit from `comint-mode-map' when entering
225 ;; inferior-prolog-mode.
228 (defvar inferior-prolog-mode-syntax-table prolog-mode-syntax-table
)
229 (defvar inferior-prolog-mode-abbrev-table prolog-mode-abbrev-table
)
231 (define-derived-mode inferior-prolog-mode comint-mode
"Inferior Prolog"
232 "Major mode for interacting with an inferior Prolog process.
234 The following commands are available:
235 \\{inferior-prolog-mode-map}
237 Entry to this mode calls the value of `prolog-mode-hook' with no arguments,
238 if that value is non-nil. Likewise with the value of `comint-mode-hook'.
239 `prolog-mode-hook' is called after `comint-mode-hook'.
241 You can send text to the inferior Prolog from other buffers using the commands
242 `process-send-region', `process-send-string' and \\[prolog-consult-region].
245 Tab indents for Prolog; with argument, shifts rest
246 of expression rigidly with the current line.
247 Paragraphs are separated only by blank lines and '%%'.
250 Return at end of buffer sends line as input.
251 Return not at end copies rest of line to end and sends it.
252 \\[comint-kill-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
253 \\[comint-interrupt-subjob] interrupts the shell or its current subjob if any.
254 \\[comint-stop-subjob] stops. \\[comint-quit-subjob] sends quit signal."
255 (setq comint-prompt-regexp
"^| [ ?][- ] *")
256 (prolog-mode-variables))
260 "Run an inferior Prolog process, input and output via buffer *prolog*."
263 (pop-to-buffer (make-comint "prolog" prolog-program-name
))
264 (inferior-prolog-mode))
266 (defun prolog-consult-region (compile beg end
)
267 "Send the region to the Prolog process made by \"M-x run-prolog\".
268 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
272 (process-send-string "prolog" prolog-compile-string
)
273 (process-send-string "prolog" prolog-consult-string
))
274 (process-send-region "prolog" beg end
)
275 (process-send-string "prolog" "\n") ;May be unnecessary
276 (if prolog-eof-string
277 (process-send-string "prolog" prolog-eof-string
)
278 (process-send-eof "prolog")))) ;Send eof to prolog process.
280 (defun prolog-consult-region-and-go (compile beg end
)
281 "Send the region to the inferior Prolog, and switch to *prolog* buffer.
282 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
284 (prolog-consult-region compile beg end
)
285 (switch-to-buffer "*prolog*"))
289 ;;; arch-tag: f3ec6748-1272-4ab6-8826-c50cb1607636
290 ;;; prolog.el ends here