[ESS] change font-lock-string-face for back ticks

[Peter Meilstrup]

Here's some elisp I have to correct some things with ESS's syntax
highlighting, including how to highlight backticks.

(add-hook 'R-mode-hook 'pbm-fix-R-syntax-highlighting)

(defun pbm-fix-R-syntax-highlighting ()
  ;; ESS classes % as punctuation, but it's
  ;; really a sort of quote delimiter -- but since it doesn't
  ;; escape with \, there's a slight hole
  (modify-syntax-entry ?% "\"")
  ;; On the other hand ESS classes $ @ and : as word characters but they
  ;; are really punctuation
  (modify-syntax-entry ?$ ".")
  (modify-syntax-entry ?@ ".")
  (modify-syntax-entry ?: ".")
  (setq font-lock-syntactic-face-function 'pbm-R-syntactic-face-function)
  (font-lock-fontify-buffer))

(defun pbm-R-syntactic-face-function (state)
  (cond
   ((nth 3 state) ;strings and stringlike elements
    (case (nth 3 state)
      ;R has four things that are to be tokenized like quotes: single
      ;and double quoted strings, backtick symbols (which are names,
      ;not strings, so they shouldn't be in string face) and %custom%
      ;infix operators which shouldn't either
      (?\" font-lock-string-face)
      (?' font-lock-string-face)
      (?` font-lock-variable-name-face)
      (?% font-lock-constant-face)))
   (t font-lock-comment-face)))



On Mon, Feb 17, 2014 at 10:22 AM, Munawar Cheema <mcheema at btinternet.com> wrote:
> On 17/02/2014 18:08, Vitalie Spinu wrote:
>>
>>   >>> Munawar Cheema on Mon, 17 Feb 2014 15:35:59 +0000 wrote:
>>
>> [...]
>>
>>   > In my emacs statements such as:
>>   > `%weirdly-named-function` <- function(){}
>>   > `var-name` <- "djsf"
>>
>>   > The face of the function is the string-face and not the face for
>>   > functions and similarly for the var-name face.
>>
>> For me the function is highlighted with
>> font-lock-function-name-face. The `var-name` is indeed highlighted as a
>> string. It kind of makes sense for it not to be.
>>
>>    Vitalie
>>
>>
>>
>
> Vitalie,
> I just tried again without my customizations and you are right the function
> does indeed get the font-lock-function-name-face.
> I tried to figure out where Emacs sets the delimiters for strings but my
> Emacs lisp foo fails me.  There must be a way to tell it not to use back
> ticks for strings in ESS-mode.
>
>
> --
> *Munawar Cheema *
>
>
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