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Subject: Re: Highlight comment in gauss mode
Date: 6 Jan 2004 16:20:49 -0800
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Thank you for your response and sorry for unclear information. 

Based on Gauss, the valid comment format is anything between /* and */
(same as C) and between @ ... @ when @ ... @ is at the same line.

I just use the gauss mode implemented by Steve Berry. However, this
mode only supports @ ... @ type comment but not highlight the comment.
The whole gauss mode is as follows. Could you help me modify the mode?
Thanks a lot.

James 


;; --------------------------------------------------------------
;; gauss-mode.el - major mode for editing Gauss programs with GNU
Emacs
;;
;; This major mode for GNU Emacs provides support for editing Gauss
;; source files.  It automatically indents for block structures, line
;; continuations (e.g., ...), and comments.  The usual paren matching
;; support is included.  
;;
;; In addition to automatic indentation when typing "do while" blocks,
;; "if" blocks, "proc" 's, etc., TAB indents an existing or new line
to
;; the correct level and META-; sets up a comment line.  META-return
starts
;; a newline at column one, ignoring the automatic indentation.
;; To properly indent an existing region in a *.prg file, use the
command
;; M-x indent-region.
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;; To enter gauss-mode automatically when editing .prg files, put 
;; something like this in your .emacs file.
;;
;;   (autoload 'gauss-mode "gauss-mode" "Enter Gauss-mode." t)
;;   (setq auto-mode-alist (cons '("\\.prg$" . gauss-mode)
auto-mode-alist))
;;   (setq gauss-mode-hook '(lambda () (setq fill-column 74)))
;;
;; Enjoy.
;;
;; THIS FILE IS A COMPLETE HACK by Steve Berry (March 1994).  It is
;; modified from octave-mode.el, which is modified from
;; matlab-mode.el.  Warning: I am no lisp programmer. 
;; The support for
;; syntax-highlighting (ie font-lock-mode) was added by Neel
Krishnaswami
;; in July 1999. 
;;
;; Octave-mode.el was modified by John W. Eaton (jwe@che.utexas.edu)
from
;; the file matlab-mode.el which is:
;;
;; Copyright (C) 1991 Matthew R. Wette.
;; Everyone is granted permission to copy, modify and redistribute
this
;; file provided:
;;   1. All copies contain this copyright notice.
;;   2. All modified copies shall carry a prominant notice stating who
;;      made the last modification and the date of such modification.
;;   3. No charge is made for this software or works derived from it.
;;      This clause shall not be construed as constraining other
software
;;      distributed on the same medium as this software, nor is a
;;      distribution fee considered a charge.
;;
;;
;; Constants used in all Gauss-mode buffers.
(defconst gauss-indent-level 2
  "*The indentation in Gauss-mode.")

(defconst gauss-comment-column 40
  "*The goal comment column in Gauss-mode buffers.")


;; Syntax Table
(defvar gauss-mode-syntax-table nil
  "Syntax table used in Gauss-mode buffers.")

(if gauss-mode-syntax-table
    ()
  (setq gauss-mode-syntax-table (make-syntax-table))
  (modify-syntax-entry ?\\ "." gauss-mode-syntax-table)
  (modify-syntax-entry ?/ "." gauss-mode-syntax-table)
  (modify-syntax-entry ?* "." gauss-mode-syntax-table)
  (modify-syntax-entry ?+ "." gauss-mode-syntax-table)
  (modify-syntax-entry ?- "." gauss-mode-syntax-table)
  (modify-syntax-entry ?= "." gauss-mode-syntax-table)
  (modify-syntax-entry ?< "." gauss-mode-syntax-table)
  (modify-syntax-entry ?> "." gauss-mode-syntax-table)
  (modify-syntax-entry ?& "." gauss-mode-syntax-table)
  (modify-syntax-entry ?| "." gauss-mode-syntax-table)
  (modify-syntax-entry ?\' "\"" gauss-mode-syntax-table)
  (modify-syntax-entry ?@ "\"" gauss-mode-syntax-table)
  (modify-syntax-entry ?/ ". 14b" gauss-mode-syntax-table)
  (modify-syntax-entry ?* ". 23b" gauss-mode-syntax-table)
  (set-syntax-table gauss-mode-syntax-table))


;; Abbrev Table
(defvar gauss-mode-abbrev-table nil
  "Abbrev table used in Gauss-mode buffers.")

(define-abbrev-table 'gauss-mode-abbrev-table ())


;; Syntax Highlighting

(defvar gauss-compiler-directives
  (mapconcat 'identity
	     '( "#define\\>"	    "#definecs\\>"
		"#undef\\>"	    "#ifdef\\>"
		"#ifndef\\>"	    "#iflight\\>"
		"#ifdos\\>"	    "#ifos2win\\>"
		"#ifunix\\>"	    "#else\\>"
		"#endif\\>"	    "#include\\>"
		"#lineson\\>"	    "#linesoff\\>"
		"#srcfile\\>"	    "#srcline\\>")
	     "\\|"))

(defvar gauss-keywords
  (mapconcat 'identity
	     '("\\<proc\\>"	"\\<keyword\\>"	
	       "\\<endp\\>"	"\\<retp\\>"
	       "\\<do\\>"	"\\<while\\>"
	       "\\<until\\>"	"\\<endo\\>"
	       "\\<for\\>"	"\\<endfor\\>"
	       "\\<break\\>"	"\\<continue\\>"
	       "\\<if\\>"	"\\<elseif\\>"
	       "\\<else\\>"	"\\<endif\\>"
	       "\\<goto\\>"	"\\<gosub\\>")
	     "\\|"))

(defvar gauss-types
  (mapconcat 'identity
	     '("\\<matrix\\>"	"\\<string\\>"
	       "\\<declare\\>"	"\\<let\\>"
	       "\\<fn\\>"	"\\<local\\>")
	     "\\|"))

(defvar gauss-identifier "[a-zA-Z0-9_]+")

(defvar gauss-local-declaration
  (concat "\\<local\\s-+"
	  "\\("
	  gauss-identifier
	  "\\s-*\\(,\\s-*" gauss-identifier "\\s-*\\)*"
	  "\\);"))

(defvar gauss-type-declaration-1
  (concat "\\<declare\\s-+"
	  "\\(matrix\\|string\\)?"
	  "\\("
	  gauss-identifier
	  "\\s-*\\(,\\s-*" gauss-identifier "\\s-*\\)*"
	  "\\);"))

(defvar gauss-type-declaration-2
  (concat "\\<declare\\s-+"
	  "\\(" gauss-types "\\)?"
	  "\\s-*"
	  "\\(" gauss-identifier "\\)"
	  "\\s-*"
	  "\\(=\\|!=\\|:=\\|\?=\\)"
	  "[^;]+;"))

(defvar gauss-proc-declaration
  (concat "\\<proc\\s-*"
	  "\\(([0-9]+)\\)?"
	  "\\s-*[=]?\\s-*"
	  "\\(" gauss-identifier "\\)"))

(defvar gauss-font-lock-keywords
  (list
   (cons gauss-compiler-directives 'font-lock-warning-face)
   (cons gauss-types 'font-lock-type-face)
   (cons gauss-keywords 'font-lock-keyword-face)
   (cons gauss-proc-declaration
	 '(2 font-lock-function-name-face nil nil))
   (cons gauss-local-declaration
	 '(1 font-lock-variable-name-face nil nil))
   (cons gauss-type-declaration-1
	 '(2 font-lock-variable-name-face nil nil))
   (cons gauss-type-declaration-2
	 '(2 font-lock-variable-name-face nil nil))))

;; Mode Map
(defvar gauss-mode-map ()
  "Keymap used in gauss-mode.")

(if gauss-mode-map
    ()
  (setq gauss-mode-map (make-sparse-keymap))
  (define-key gauss-mode-map "\r" 'gauss-return)
  (define-key gauss-mode-map "\t" 'gauss-indent-line)
  (define-key gauss-mode-map "\M-;" 'gauss-comment)
  (define-key gauss-mode-map "\C-ct" 'gauss-line-type)
  (define-key gauss-mode-map "\C-ci" 'gauss-indent-type)
  (define-key gauss-mode-map "\M-\r" 'newline))


;; Gauss Mode
(defun gauss-mode ()
  "Major mode for editing Gauss source files.  Version 1.0, 23 Feb
1993.
Will run gauss-mode-hook if it is non-nil.  Auto-fill-mode seems to
work.
Filling does not work (yet).
Special Key Bindings:
\\{gauss-mode-map}
Variables:
  gauss-indent-level                   Level to indent blocks.
  gauss-comment-column                 Goal column for on-line
comments.
  fill-column                           Column used in auto-fill
(default=70).
Commands:
  gauss-mode                           Enter Gauss major mode.
  gauss-return                         Handle return with indenting.
  gauss-indent-line                    Indent line for structure.
  gauss-comment                        Add comment to current line.
  gauss-comment-indent                 Compute indent for comment.
  gauss-line-type                      Tell current line type (for
debugging).
  gauss-indent-type                    Tell last indent type (for
debugging).
To add automatic support put something like the following in your
.emacs file:
  \(autoload 'gauss-mode \"gauss-mode\" \"Enter Gauss-mode.\" t\)
  \(setq auto-mode-alist \(cons '\(\"\\\\.m[201z$\" . gauss-mode\) \
auto-mode-alist\)\)
  \(setq gauss-mode-hook '\(lambda \(\) \(setq fill-column 74\)\)\)"
  (interactive)
  (kill-all-local-variables)
  (use-local-map gauss-mode-map)
  (setq major-mode 'gauss-mode)
  (setq mode-name "Gauss")
  (setq local-abbrev-table gauss-mode-abbrev-table)
  (set-syntax-table gauss-mode-syntax-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 'gauss-indent-line)
  (make-local-variable 'comment-start-skip)
  (setq comment-start-skip "[%@][ \t]*")
  (make-local-variable 'comment-column)
  (setq comment-column 'gauss-comment-column)
  (make-local-variable 'comment-indent-hook)
  (setq comment-indent-hook 'gauss-comment-indent)
  (make-local-variable 'fill-column)
  (setq fill-column default-fill-column)
  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults '(gauss-font-lock-keywords
			     t		         ;; Keywords-only?
			     t  		 ;; Fold case?
			     nil		 ;; Syntax-alist
			     nil		 ;; Syntax-begin    
			    ))
  (run-hooks 'gauss-mode-hook))


(defun gauss-return ()
  "Handle carriage return in Gauss-mode."
  (interactive)
  (if (gauss-block-end-line)
      (gauss-indent-line))
  (newline)
  (gauss-indent-line))

(defun gauss-comment ()
  "Add a comment to the following line, or format if one already
exists."
  (interactive)
  (cond
   ((gauss-empty-line)
    (gauss-indent-line)
    (insert "@   @") 
    (backward-char) (backward-char) (backward-char) )
   ((gauss-comment-line))
   (t
    (end-of-line)
    (re-search-backward "[^ \t^]" 0 t)
    (forward-char)
    (delete-horizontal-space)
    (if (< (current-column) gauss-comment-column)
        (indent-to gauss-comment-column)
      (insert " "))
    (insert "@   @") 
     (backward-char) (backward-char) (backward-char) )))

(defun gauss-comment-indent ()
  "Indent a comment line in Gauss-mode."
  (gauss-calc-indent))

(defun gauss-indent-line ()
  "Indent a line in Gauss-mode."
  (interactive)
  (save-excursion
    (beginning-of-line)
    (delete-horizontal-space)
    (indent-to (gauss-calc-indent)))
  (skip-chars-forward " \t"))

(defconst gauss-comment-1
  (list
   '("@.*@" . font-lock-warning-face))
  "highlighting comment.")


(defun gauss-line-type ()
  "Display type of current line.  Used in debugging."
  (interactive)
  (cond
   ((gauss-empty-line)
    (message "gauss-line-type: empty-line"))
   ((gauss-comment-line)
    (message "gauss-line-type: comment-line"))
   ((gauss-continuation-line)
    (message "gauss-line-type: continuation-line"))
   ((gauss-block-beg-end-line)
    (message "gauss-line-type: block-beg-end-line"))
   ((gauss-block-beg-line)
    (message "gauss-line-type: block-beg-line"))
   ((gauss-block-end-line)
    (message "gauss-line-type: block-end-line"))
   (t
    (message "gauss-line-type: other"))))

(defun gauss-indent-type ()
  "Display type of current or previous nonempty line.  Used in
debugging."
  (interactive)
  (message (concat "gauss-ident-type: " gauss-last-indent-type)))

(defun gauss-fill-region (from to &optional justify-flag)
  "Fill the region of comments.
Prefix arg (non-nil third arg, if called from program)
means justify as well."
  (interactive "r\nP")
  (messages "gauss-fill-region not implemented yet."))

(defvar gauss-last-indent-type "unknown"
  "String to tell line type.")

(defun gauss-calc-indent ()
  "Return the appropriate indentation for this line as an int."
  (let ((indent 0))
    (save-excursion
      (forward-line -1)                 ; compute indent based on
previous
      (if (gauss-empty-line)               ;   non-empty line
          (re-search-backward "[^ \t\n]" 0 t))
      (cond
       ((gauss-empty-line) 
        (setq gauss-last-indent-type "empty"))
       ((gauss-comment-line) 
        (setq gauss-last-indent-type "comment"))
       ((gauss-continuation-line)
        (setq gauss-last-indent-type "continuation")
        (setq indent (* 2 gauss-indent-level)))
       ((gauss-block-beg-end-line)
        (setq gauss-last-indent-type "block begin-end"))
       ((gauss-block-beg-line)
        (setq gauss-last-indent-type "block begin")
        (setq indent gauss-indent-level))
       ((gauss-unbal-matexp-line)
        (setq gauss-last-indent-type "unbalanced-matrix-expression")
        (setq indent (gauss-calc-matexp-indent)))
       (t
        (setq gauss-last-indent-type "other")))
      (setq indent (+ indent (current-indentation)))
      (if (= 0 (forward-line -1))
          (if (gauss-continuation-line)
              (setq indent (- indent (* 2 gauss-indent-level))))))
    (if (gauss-block-end-line) (setq indent (- indent
gauss-indent-level)))
    (if (< indent 0) (setq indent 0))
    indent))


(defun gauss-empty-line ()
  "Returns t if current line is empty."
  (save-excursion
    (beginning-of-line)
    (looking-at "^[ \t]*$")))

(defun gauss-comment-line ()
  "Returns t if current line is an Gauss comment line."
  (save-excursion
    (beginning-of-line)
    (skip-chars-forward " \t")
    (looking-at "[%@]")))

(defun gauss-continuation-line ()
  "Returns t if current line ends in ... and optional comment."
  (save-excursion
    (beginning-of-line)
    (re-search-forward "\\.\\.\\.+[ \t]*\\(%.*\\)?$"
(gauss-eoln-point) t)))

(defun gauss-eoln-point ()
  "Returns point for end-of-line in Gauss-mode."
  (save-excursion
    (end-of-line)
    (point)))

(defun gauss-block-beg-line ()
  "Returns t if line contains beginning of Gauss block."
  (save-excursion
    (beginning-of-line)
    (looking-at (concat "\\([^%@\n]*[ \t]\\)?" gauss-block-beg-kw))))

(defconst gauss-block-beg-kw
  "\\(for\\|while\\|until\\|if\\|else\\|elseif\\|proc \\)"
  "Regular expression for keywords which begin blocks in Gauss-mode.")

(defun gauss-block-end-line ()
  "Returns t if line contains end of Gauss block."
  (save-excursion
    (beginning-of-line)
    (looking-at (concat "\\([^%@\n]*[ \t]\\)?" gauss-block-end-kw))))

(defconst gauss-block-end-kw
  "\\(endfor\\|endo\\|endif\\|endp\\|else\\|elseif\\)"
  "Regular expression for keywords which end blocks.")

(defun gauss-block-beg-end-line ()
  "Returns t if line contains matching block begin-end in Gauss-mode."
  (save-excursion
    (beginning-of-line)
    (looking-at (concat
                 "\\([^%@\n]*[ \t]\\)?" gauss-block-beg-kw 
                 "." "\\([^%@\n]*[ \t]\\)?" gauss-block-end-kw))))

(defun gauss-unbal-matexp-line ()
  (if (= (gauss-calc-matexp-indent) 0)
    ()
    t))

(defun gauss-calc-matexp-indent ()
  (let ((indent 0))
    (save-excursion
      (beginning-of-line)
      (while (< (point) (gauss-eoln-point))
	(cond
	 ((looking-at "\\[")
	  (setq indent (+ indent gauss-indent-level)))
	 ((looking-at "\\]")
	  (setq indent (- indent gauss-indent-level))))
	(forward-char)))
    (* 2 indent)))

(defun gauss-comment-on-line ()
  "Returns t if current line contains a comment."
  (save-excursion
    (beginning-of-line)
    (looking-at "[^\n]*[%@]")))

(defun gauss-in-comment ()
  "Returns t if point is in a comment."
  (save-excursion
    (and (/= (point) (point-max)) (forward-char))
    (search-backward "[%@]" (save-excursion (beginning-of-line)
(point)) t)))

(defvar gauss-auto-newline nil
  "*Non-nil means automatically newline after semicolomns.")




(provide 'gauss-mode)

;; --- last line of gauss-mode.el --- 




Stefan Monnier <monnier@iro.umontreal.ca> wrote in message news:<jwvad517wo7.fsf-monnier+gnu.emacs.help@asado.iro.umontreal.ca>...
> > @ This is one line comment @
> 
> Is
> 
>   @ this is
>     a two line comment @
> 
> valid?  Or is
> 
>   @ this is a one line comment
> 
> valid?  How about
> 
>   @ comment @ not comment
> 
> ?
> 
> > /* 
> > This is multiple-lines comments
> > */
>  
> > My current syntax  table is as the follows but it did not work.
> 
> You don't give us enough info to know what you did and what failed to happen.
> 
> >   (modify-syntax-entry ?@ "\"" gauss-mode-syntax-table)
> 
> This is wrong because it says @ is used for strings rather than
> for comments.  You probably want to use "!" instead of "\"" although
> it depends on the answers to the above questions.
> 
> >   (modify-syntax-entry ?/ ". 14b" gauss-mode-syntax-table)
> >   (modify-syntax-entry ?* ". 23b" gauss-mode-syntax-table)
> 
> That looks right.
> 
> 
>         Stefan