Initial revision

1 files changed, 257 insertions, 0 deletions

diff --git a/lisp/progmodes/prolog.el b/lisp/progmodes/prolog.el
new file mode 100644
index 00000000000..2ca899a59d0
--- /dev/null
+++ b/lisp/progmodes/prolog.el
@@ -0,0 +1,257 @@
+;; Major mode for editing Prolog, and for running Prolog under Emacs
+;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+;; Author Masanobu UMEDA (umerin@flab.flab.fujitsu.junet)
+
+;; 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 1, 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.
+
+(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 operaing 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 ?< "." 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-hook)
+  (setq comment-indent-hook '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))
+
+(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))
+
+(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*"))