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