Re: Adding font-lock keywords

[Glenn Morris]

Brendan Van Horn wrote:

> (setq my-win32-constant-keywords
>       (regexp-opt
>        '("COINIT_MULTITHREADED" "ICC_COOL_CLASSES" "NULL" "SW_SHOWDEFAULT"
>        "VT_BSTR" "VT_I4")))
>
> (font-lock-add-keywords
>  'c++-mode
>  '((my-win32-constant-keywords . font-lock-constant-face)))

Use of a single-quote ' prevents symbols from being evaluated.

Compare:

my-win32-constant-keywords

with

'my-win32-constant-keywords

by putting the cursor at the end of the line and using C-x C-e. What
you are doing is adding the symbol my-win32-constant-keywords to the
keywords list, rather than its value.

You could use

(font-lock-add-keywords
 'c++-mode
 `((,my-win32-constant-keywords . font-lock-constant-face)))

because ` acts like ' except that anything preceded by a comma gets
evaluated. Or you could use:

(font-lock-add-keywords
 'c++-mode
 (list
  (cons my-win32-constant-keywords font-lock-constant-face)))