Allow highlighting for numbers

Author: jsmestad

elixir-mode.el

@@ -88,6 +88,13 @@
  "For use with atoms & map keys."
  :group 'font-lock-faces)
 
+(defvar elixir-number-face 'elixir-number-face)
+(defface elixir-number-face
+ '((t (:inherit font-lock-builtin-face)))
+ "For use with numbers."
+ :group 'font-lock-faces)
+
+
 (eval-when-compile
  (defconst elixir-rx-constituents
  `(
@@ -107,6 +114,11 @@
  (zero-or-more (any "a-z" "A-Z" "0-9" "_" "\"" "'" "!" "@" "?")))
  (and "\"" (one-or-more (not (any "\""))) "\"")
  (and "'" (one-or-more (not (any "'"))) "'"))))
+ (numbers . ,(rx (and symbol-start
+ (? "-")
+ (+ digit)
+ (0+ (and "_" (= 3 digit)))
+ symbol-end)))
  (builtin . ,(rx symbol-start
  (or "case" "cond" "for" "if" "quote" "raise" "receive" "send"
  "super" "throw" "try" "unless" "unquote" "unquote_splicing"
@@ -382,6 +394,10 @@ is used to limit the scan."
  (optional "="))
  1 elixir-atom-face)
 
+ ;; Numbers
+ (,(elixir-rx (group numbers))
+ 1 elixir-number-face)
+
  ;; Gray out variables starting with "_"
  (,(elixir-rx symbol-start
  (group (and "_"