code.delx.au - gnu-emacs/blob - lisp/progmodes/prolog.el

   1 ;;; prolog.el --- major mode for editing and running Prolog under Emacs
   2
   3 ;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
   4
   5 ;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp>
   6 ;; Keywords: languages
   7
   8 ;; This file is part of GNU Emacs.
   9
  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)
  13 ;; any later version.
  14
  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.
  19
  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 the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; This package provides a major mode for editing Prolog.  It knows
  28 ;; about Prolog syntax and comments, and can send regions to an inferior
  29 ;; Prolog interpreter process.
  30
  31 ;;; Code:
  32
  33 (defvar prolog-mode-syntax-table nil)
  34 (defvar prolog-mode-abbrev-table nil)
  35 (defvar prolog-mode-map nil)
  36
  37 (defgroup prolog nil
  38   "Major mode for editing and running Prolog under Emacs"
  39   :group 'languages)
  40
  41
  42 (defcustom prolog-program-name "prolog"
  43   "*Program name for invoking an inferior Prolog with `run-prolog'."
  44   :type 'string
  45   :group 'prolog)
  46
  47 (defcustom prolog-consult-string "reconsult(user).\n"
  48   "*(Re)Consult mode (for C-Prolog and Quintus Prolog). "
  49   :type 'string
  50   :group 'prolog)
  51
  52 (defcustom prolog-compile-string "compile(user).\n"
  53   "*Compile mode (for Quintus Prolog)."
  54   :type 'string
  55   :group 'prolog)
  56
  57 (defcustom prolog-eof-string "end_of_file.\n"
  58   "*String that represents end of file for prolog.
  59 nil means send actual operating system end of file."
  60   :type 'string
  61   :group 'prolog)
  62
  63 (defcustom prolog-indent-width 4
  64   "Level of indentation in Prolog buffers."
  65   :type 'integer
  66   :group 'prolog)
  67
  68 (if prolog-mode-syntax-table
  69     ()
  70   (let ((table (make-syntax-table)))
  71     (modify-syntax-entry ?_ "w" table)
  72     (modify-syntax-entry ?\\ "\\" table)
  73     (modify-syntax-entry ?/ "." table)
  74     (modify-syntax-entry ?* "." table)
  75     (modify-syntax-entry ?+ "." table)
  76     (modify-syntax-entry ?- "." table)
  77     (modify-syntax-entry ?= "." table)
  78     (modify-syntax-entry ?% "<" table)
  79     (modify-syntax-entry ?\n ">" table)
  80     (modify-syntax-entry ?< "." table)
  81     (modify-syntax-entry ?> "." table)
  82     (modify-syntax-entry ?\' "\"" table)
  83     (setq prolog-mode-syntax-table table)))
  84
  85 (define-abbrev-table 'prolog-mode-abbrev-table ())
  86
  87 (defun prolog-mode-variables ()
  88   (set-syntax-table prolog-mode-syntax-table)
  89   (setq local-abbrev-table prolog-mode-abbrev-table)
  90   (make-local-variable 'paragraph-start)
  91   (setq paragraph-start (concat "%%\\|$\\|" page-delimiter)) ;'%%..'
  92   (make-local-variable 'paragraph-separate)
  93   (setq paragraph-separate paragraph-start)
  94   (make-local-variable 'paragraph-ignore-fill-prefix)
  95   (setq paragraph-ignore-fill-prefix t)
  96   (make-local-variable 'imenu-generic-expression)
  97   (setq imenu-generic-expression "^[a-z][a-zA-Z0-9_]+")
  98   (make-local-variable 'indent-line-function)
  99   (setq indent-line-function 'prolog-indent-line)
 100   (make-local-variable 'comment-start)
 101   (setq comment-start "%")
 102   (make-local-variable 'comment-start-skip)
 103   (setq comment-start-skip "%+ *")
 104   (make-local-variable 'comment-column)
 105   (setq comment-column 48)
 106   (make-local-variable 'comment-indent-function)
 107   (setq comment-indent-function 'prolog-comment-indent))
 108
 109 (defun prolog-mode-commands (map)
 110   (define-key map "\t" 'prolog-indent-line)
 111   (define-key map "\e\C-x" 'prolog-consult-region))
 112
 113 (if prolog-mode-map
 114     nil
 115   (setq prolog-mode-map (make-sparse-keymap))
 116   (prolog-mode-commands prolog-mode-map))
 117
 118 ;;;###autoload
 119 (defun prolog-mode ()
 120   "Major mode for editing Prolog code for Prologs.
 121 Blank lines and `%%...' separate paragraphs.  `%'s start comments.
 122 Commands:
 123 \\{prolog-mode-map}
 124 Entry to this mode calls the value of `prolog-mode-hook'
 125 if that value is non-nil."
 126   (interactive)
 127   (kill-all-local-variables)
 128   (use-local-map prolog-mode-map)
 129   (setq major-mode 'prolog-mode)
 130   (setq mode-name "Prolog")
 131   (prolog-mode-variables)
 132   (run-hooks 'prolog-mode-hook))
 133
 134 (defun prolog-indent-line (&optional whole-exp)
 135   "Indent current line as Prolog code.
 136 With argument, indent any additional lines of the same clause
 137 rigidly along with this one (not yet)."
 138   (interactive "p")
 139   (let ((indent (prolog-indent-level))
 140         (pos (- (point-max) (point))) beg)
 141     (beginning-of-line)
 142     (setq beg (point))
 143     (skip-chars-forward " \t")
 144     (if (zerop (- indent (current-column)))
 145         nil
 146       (delete-region beg (point))
 147       (indent-to indent))
 148     (if (> (- (point-max) pos) (point))
 149         (goto-char (- (point-max) pos)))
 150     ))
 151
 152 (defun prolog-indent-level ()
 153   "Compute prolog indentation level."
 154   (save-excursion
 155     (beginning-of-line)
 156     (skip-chars-forward " \t")
 157     (cond
 158      ((looking-at "%%%") 0)             ;Large comment starts
 159      ((looking-at "%[^%]") comment-column) ;Small comment starts
 160      ((bobp) 0)                         ;Beginning of buffer
 161      (t
 162       (let ((empty t) ind more less)
 163         (if (looking-at ")")
 164             (setq less t)               ;Find close
 165           (setq less nil))
 166         ;; See previous indentation
 167         (while empty
 168           (forward-line -1)
 169           (beginning-of-line)
 170           (if (bobp)
 171               (setq empty nil)
 172             (skip-chars-forward " \t")
 173             (if (not (or (looking-at "%[^%]") (looking-at "\n")))
 174                 (setq empty nil))))
 175         (if (bobp)
 176             (setq ind 0)                ;Beginning of buffer
 177           (setq ind (current-column)))  ;Beginning of clause
 178         ;; See its beginning
 179         (if (looking-at "%%[^%]")
 180             ind
 181           ;; Real prolog code
 182           (if (looking-at "(")
 183               (setq more t)             ;Find open
 184             (setq more nil))
 185           ;; See its tail
 186           (end-of-prolog-clause)
 187           (or (bobp) (forward-char -1))
 188           (cond ((looking-at "[,(;>]")
 189                  (if (and more (looking-at "[^,]"))
 190                      (+ ind prolog-indent-width) ;More indentation
 191                    (max tab-width ind))) ;Same indentation
 192                 ((looking-at "-") tab-width) ;TAB
 193                 ((or less (looking-at "[^.]"))
 194                  (max (- ind prolog-indent-width) 0)) ;Less indentation
 195                 (t 0))                  ;No indentation
 196           )))
 197      )))
 198
 199 (defun end-of-prolog-clause ()
 200   "Go to end of clause in this line."
 201   (beginning-of-line 1)
 202   (let* ((eolpos (save-excursion (end-of-line) (point))))
 203     (if (re-search-forward comment-start-skip eolpos 'move)
 204         (goto-char (match-beginning 0)))
 205     (skip-chars-backward " \t")))
 206
 207 (defun prolog-comment-indent ()
 208   "Compute prolog comment indentation."
 209   (cond ((looking-at "%%%") 0)
 210         ((looking-at "%%") (prolog-indent-level))
 211         (t
 212          (save-excursion
 213                (skip-chars-backward " \t")
 214                ;; Insert one space at least, except at left margin.
 215                (max (+ (current-column) (if (bolp) 0 1))
 216                     comment-column)))
 217         ))
 218
 219 \f
 220 ;;;
 221 ;;; Inferior prolog mode
 222 ;;;
 223 (defvar inferior-prolog-mode-map nil)
 224
 225 (defun inferior-prolog-mode ()
 226   "Major mode for interacting with an inferior Prolog process.
 227
 228 The following commands are available:
 229 \\{inferior-prolog-mode-map}
 230
 231 Entry to this mode calls the value of `prolog-mode-hook' with no arguments,
 232 if that value is non-nil.  Likewise with the value of `comint-mode-hook'.
 233 `prolog-mode-hook' is called after `comint-mode-hook'.
 234
 235 You can send text to the inferior Prolog from other buffers
 236 using the commands `send-region', `send-string' and \\[prolog-consult-region].
 237
 238 Commands:
 239 Tab indents for Prolog; with argument, shifts rest
 240  of expression rigidly with the current line.
 241 Paragraphs are separated only by blank lines and '%%'.
 242 '%'s start comments.
 243
 244 Return at end of buffer sends line as input.
 245 Return not at end copies rest of line to end and sends it.
 246 \\[comint-kill-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
 247 \\[comint-interrupt-subjob] interrupts the shell or its current subjob if any.
 248 \\[comint-stop-subjob] stops. \\[comint-quit-subjob] sends quit signal."
 249   (interactive)
 250   (require 'comint)
 251   (comint-mode)
 252   (setq major-mode 'inferior-prolog-mode
 253         mode-name "Inferior Prolog"
 254         comint-prompt-regexp "^| [ ?][- ] *")
 255   (prolog-mode-variables)
 256   (if inferior-prolog-mode-map nil
 257     (setq inferior-prolog-mode-map (copy-keymap comint-mode-map))
 258     (prolog-mode-commands inferior-prolog-mode-map))
 259   (use-local-map inferior-prolog-mode-map)
 260   (run-hooks 'prolog-mode-hook))
 261
 262 ;;;###autoload
 263 (defun run-prolog ()
 264   "Run an inferior Prolog process, input and output via buffer *prolog*."
 265   (interactive)
 266   (require 'comint)
 267   (switch-to-buffer (make-comint "prolog" prolog-program-name))
 268   (inferior-prolog-mode))
 269
 270 (defun prolog-consult-region (compile beg end)
 271   "Send the region to the Prolog process made by \"M-x run-prolog\".
 272 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
 273   (interactive "P\nr")
 274   (save-excursion
 275     (if compile
 276         (send-string "prolog" prolog-compile-string)
 277       (send-string "prolog" prolog-consult-string))
 278     (send-region "prolog" beg end)
 279     (send-string "prolog" "\n")         ;May be unnecessary
 280     (if prolog-eof-string
 281         (send-string "prolog" prolog-eof-string)
 282       (process-send-eof "prolog")))) ;Send eof to prolog process.
 283
 284 (defun prolog-consult-region-and-go (compile beg end)
 285   "Send the region to the inferior Prolog, and switch to *prolog* buffer.
 286 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
 287   (interactive "P\nr")
 288   (prolog-consult-region compile beg end)
 289   (switch-to-buffer "*prolog*"))
 290
 291 (provide 'prolog)
 292
 293 ;;; prolog.el ends here