Syntax highlight (problem with 'concat)

Syntax highlight (problem with 'concat)

[Tim Johnson]

Hello:
I'm attempting to create a derived mode for lisp using the example
from this URL:
http://www.emacswiki.org/cgi-bin/wiki/DerivedMode

;; Note the line in the code below where I use the 'concat form
;; This line does not provide the syntax highlighting that I desire.
;;  However, the line above with the literal regexp string *does*
;; highlight correctly
;; Any hints on how to correct the usage of the 'concat form will
;; be greatly appreciated.
(define-derived-mode tj-lisp-mode lisp-mode "tj-lisp"
  "Major Mode for extending standard lisp mode"
  (defconst tj-lisp-user-keywords (regexp-opt '("print" "setq")))
  (defconst tj-word-begin "\\b\\(")
  (defconst tj-word-end "\\)\\b")
      ;;register keywords
    (setq tj-lisp-font-lock-keywords
          (list '("\\b\\(if\\|progn\\)\\b" .  font-lock-loop-face)
                '("\\b\\(print\\|setq\\)\\b" .  font-lock-user-keyword-face)   ;; good, line below is bad
                ;'((concat tj-word-begin tj-lisp-user-keywords tj-word-end) . font-lock-user-keyword-face)
                ))
  (font-lock-mode))
;; TIA
tj

-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com

Re: Syntax highlight (problem with 'concat)

[Ian Zimmerman]

Tim> Hello:
Tim> I'm attempting to create a derived mode for lisp using the example
Tim> from this URL:
Tim> http://www.emacswiki.org/cgi-bin/wiki/DerivedMode

Tim> ;; Note the line in the code below where I use the 'concat form
Tim> ;; This line does not provide the syntax highlighting that I desire.
Tim> ;;  However, the line above with the literal regexp string *does*
Tim> ;; highlight correctly
Tim> ;; Any hints on how to correct the usage of the 'concat form will
Tim> ;; be greatly appreciated.
Tim> (define-derived-mode tj-lisp-mode lisp-mode "tj-lisp"
Tim> "Major Mode for extending standard lisp mode"
Tim> (defconst tj-lisp-user-keywords (regexp-opt '("print" "setq")))
Tim> (defconst tj-word-begin "\\b\\(")
Tim> (defconst tj-word-end "\\)\\b")
Tim> ;;register keywords
Tim> (setq tj-lisp-font-lock-keywords
Tim> (list '("\\b\\(if\\|progn\\)\\b" .  font-lock-loop-face)
Tim> '("\\b\\(print\\|setq\\)\\b" .  font-lock-user-keyword-face)   ;; good, line below is bad
Tim> ;'((concat tj-word-begin tj-lisp-user-keywords tj-word-end) . font-lock-user-keyword-face)
Tim> ))
Tim> (font-lock-mode))
Tim> ;; TIA
Tim> tj

The quote around the last item in the list applies to _everything_ inside.
So your concat call never actually happens.  What you want is something like

...

(cons (concat tj-word-begin tj-lisp-user-keywords tj-word-end) 'font-lock-user-keyword-face)
...


or use quasi-quotes (see Elisp manual)

-- 
A true pessimist won't be discouraged by a little success.

Re: Syntax highlight (problem with 'concat)

[Tim Johnson]

* Ian Zimmerman <nobrowser@gmail.com> [060102 18:51]:
> Tim> '("\\b\\(print\\|setq\\)\\b" .  font-lock-user-keyword-face)   ;; good, line below is bad
> Tim> ;'((concat tj-word-begin tj-lisp-user-keywords tj-word-end) . font-lock-user-keyword-face)
> 
> The quote around the last item in the list applies to _everything_ inside.
> So your concat call never actually happens.  What you want is something like
 
  I suspected that ....
> ...
> 
> (cons (concat tj-word-begin tj-lisp-user-keywords tj-word-end) 'font-lock-user-keyword-face)

 Aha!
> ...
> 
> 
> or use quasi-quotes (see Elisp manual)

   Okay, will bone up on that too...

   Thank you Ian!
-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com

Re: Syntax highlight (problem with 'concat)

[Kevin Rodgers]

Tim Johnson wrote:
> * Ian Zimmerman <nobrowser@gmail.com> [060102 18:51]:
>>or use quasi-quotes (see Elisp manual)
> 
>    Okay, will bone up on that too...

Good luck finding that: the correct term is "Backquote".

-- 
Kevin