help on text-properties

help on text-properties

[Yu,Gang]

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Hi all:
  I want to set text properties on a string, however, any time I get a nil
result after the (set|add)-text-properties call, the text is not properly
propetied.

 what's wrong??

I use emacs 22.1, here is the source code:

(defun show-paren-minibuffer (pair-point pos)
  "show the paren pair in the minibuffer, pos is current point , pair-point
is the point of the paren pair"
  (if (not (pos-visible-in-window-p pair-point))
      (let ((pair-line-number (line-number-at-pos pair-point))
        (pos-line-number (line-number-at-pos pos))
        show-string
        offset)
    (if (not (equal pair-line-number pos-line-number))
        (save-excursion
          (goto-line pair-line-number)
          (setq offset (- pair-point (line-beginning-position)))
          (setq show-string (buffer-substring (line-beginning-position)
(line-end-position)))
          (diag-pr (set-text-properties offset offset '(comment t face
highlight) show-string))
          (if (< (length show-string) 20)
          (setq show-string
            (concat
             (buffer-substring
              (- (line-beginning-position) 30)
              (- (line-beginning-position) 1))
             "\n"
             show-string
             "\n"
             (buffer-substring
              (+ (line-end-position) 1)
              (+ (line-end-position) 30)))))
          (message "%s" show-string))))))

and my diag-pr macro:

(defmacro diag-pr (exp)
  "print the expression result in the *scratch buffer"
  `(let ((tmp-diag-var ,exp))
     (print (list ',exp 'result 'is (list tmp-diag-var)) diag-buffer)
     tmp-diag-var))

in the diag-buffer, all resutls display "nil"

How can I sovle the problem?

thanks !!

-- 
YuGang

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Re: help on text-properties

[Thien-Thi Nguyen]

() "Yu,Gang" <wuhanyugang@gmail.com>
() Wed, 6 Jun 2007 13:15:35 +0800

   (set-text-properties offset offset ...)

   How can I sovle the problem?

what is the distance between offset and offset?
(would be a fine number to count if but "not yet".)
when an expression paints pictures in thin air,
can memory alone suffice to record what's there?
if desire to build is too strong, one reflects,
it's easy to miss what is wrong, through neglect.

thi

Re: help on text-properties

[Kim F. Storm]

"Yu,Gang" <wuhanyugang@gmail.com> writes:

> Hi all:
>  I want to set text properties on a string, however, any time I get a nil
> result after the (set|add)-text-properties call, the text is not properly
> propetied.
>
> what's wrong??

>          (diag-pr (set-text-properties offset offset '(comment t face
> highlight) show-string))

This part?

It sets the properties from "offset" to "offset" -- which is a no-op.

-- 
Kim F. Storm  http://www.cua.dk

Re: help on text-properties

[Yu,Gang]

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Thanks, I get things run now~

(defun show-paren-minibuffer (pair-point pos)
  "show the paren pair in the minibuffer"
  (if (not (pos-visible-in-window-p pair-point))
      (let ((pair-line-number (line-number-at-pos pair-point))
        (pos-line-number (line-number-at-pos pos))
        show-string
        offset)
    (if (not (equal pair-line-number pos-line-number))
        (save-excursion
          (goto-line pair-line-number)
          (setq offset (- pair-point (line-beginning-position)))
          (setq show-string (buffer-substring (line-beginning-position)
(line-end-position)))
          (if (> pos pair-point)
          (add-text-properties offset (+ offset 1) '(fontified t face
highlight) show-string)
        (add-text-properties (- offset 1) offset '(fontified t face
highlight) show-string))
          (if (< (length show-string) 20)
          (setq show-string
            (concat
             (buffer-substring
              (- (line-beginning-position) 30)
              (- (line-beginning-position) 1))
             "\n"
             show-string
             "\n"
             (buffer-substring
              (+ (line-end-position) 1)
              (+ (line-end-position) 30)))))
          (message "%s" show-string))))))

On 6/6/07, Thien-Thi Nguyen <ttn@gnuvola.org> wrote:
>
> () "Yu,Gang" <wuhanyugang@gmail.com>
> () Wed, 6 Jun 2007 13:15:35 +0800
>
>    (set-text-properties offset offset ...)
>
>    How can I sovle the problem?
>
> what is the distance between offset and offset?
> (would be a fine number to count if but "not yet".)
> when an expression paints pictures in thin air,
> can memory alone suffice to record what's there?
> if desire to build is too strong, one reflects,
> it's easy to miss what is wrong, through neglect.
>
> thi
> _______________________________________________
> help-gnu-emacs mailing list
> help-gnu-emacs@gnu.org
> http://lists.gnu.org/mailman/listinfo/help-gnu-emacs
>



-- 
YuGang

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