--- Begin Message ---
Subject: |
elisp: Replacing dots in strings (. -> \.) |
Date: |
Sun, 8 Jul 2007 08:10:51 -0300 |
User-agent: |
Mutt/1.5.16 (2007-06-11) |
Hi.
I'm using Emacs 22.1, and while working on my .emacs file I found
a problem.
I have written functions to add a face to font-lock, and then let me
add words to be highlighted with a different color.
;; The new special face:
;;
(defface special-face
'((t (:foreground "red" :background "black")))
"Special face used to dynamically add words to be highlighted.")
(set-face-foreground 'special-face "red")
;; Adds one symbol to be highlighted as special-face.
;;
(defun add-special-at-point ()
"Adds the symbol at point to the list of symbols to be highlighted
with special-face."
(interactive)
(let ((name (symbol-name (symbol-at-point))))
(message name)
(let ((newname (replace-regexp-in-string "\\." "\\\\." name t t)))
(font-lock-add-keywords nil `((,name . 'special-face))))))
;; f9 will add the symbol at point:
;;
(global-set-key [f9] 'add-special-at-point)
This doesn't work really well, because when I write a symbol that starts
with a dot:
.my_special_var
And put it in the list, then Emacs will treat the leading dot as
in a regexp, and here:
(my_special_var ...)
the opening parenthesis would be highlighted also.
This seems to be because replace-regexp-in-string is ignoring
the :literal argument (I'm guessing).
I have tried passing "t" for the "literal" argument in
replace-regexp-in-string, and tried several different amounts of
backslashes in the replacement string and found something funny:
(replace-regexp-in-string "\\." "\." "aaa . bbb" t t)
==> "aaa . bbb"
(replace-regexp-in-string "\\." "\\." "aaa . bbb" t t)
==> "aaa \\. bbb"
(replace-regexp-in-string "\\." "\\\." "aaa . bbb" t t)
==> "aaa \\. bbb"
(replace-regexp-in-string "\\." "\\\\." "aaa . bbb" t t)
==> "aaa \\\\. bbb"
Now, that confuses me since I was explicitly asking the replacement to
be treated literally. What I am doing wrong?
Or, is there an easier way to replace the dots in a string so that
function will work properly?
Thanks a lot,
J.
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