De beste javascript mode voor Emacs is deze van Karl Landström. Hij heeft alleen moeite met het correct detecteren van strings en regexes:
Niet leuk als je de source van jQuery opent. (Waarschuwing, dit crasht emacs!)
Ook niet leuk is dat Emacs’ ingebouwde syntax-table niet overweg kan
met de complete overloading van / in Javascript (als deel-operator, regex quote, en 2 soorten commentaar marker). Boeh voor Emacs!
De oplossing is dan om alle auto-quoting uit te zetten en het zelf te doen. Kan je net zulke ingewikkelde syntax mee highlighten als je wilt. Hoera voor Emacs!
Relevante passages:
;; --- Syntax Table And Parsing ---
(defvar javascript-mode-syntax-table
(let ((table (make-syntax-table)))
(c-populate-syntax-table table)
;; switch off build-in quoted string detection
;; since that just makes it really hard to detect
;; regular expressions and comments
;;
;; this also has the benefit that multiline strings
;; are now not recognized as strings (since javascript does
;; not allow them)
(modify-syntax-entry ?' "." table)
(modify-syntax-entry ?\" "." table)
;; The syntax class of underscore should really be `symbol' ("_")
;; but that makes matching of tokens much more complex as e.g.
;; "\\" matches part of e.g. "_xyz" and "xyz_abc". Defines
;; it as word constituent for now.
(modify-syntax-entry ?_ "w" table)
table)
"Syntax table used in JavaScript mode.")
(defconst js-quoted-string-re "\\(\".*?[^\\]\"\\|'.*?[^\\]'\\)")
(defconst js-quoted-string-or-regex-re "\\(/.*?[^\\]/\\w*\\|\".*?[^\\]\"\\|'.*?[^\\]'\\)")
(defconst js-font-lock-keywords-1
(list
"\\"
(list js-function-heading-1-re 1 font-lock-function-name-face)
(list js-function-heading-2-re 1 font-lock-function-name-face)
;; detect literal strings following a + operator
(list (concat "+[ \t]*" js-quoted-string-re) 1 font-lock-string-face)
;; detect literal strings used in "literal object" keys
(list (concat "[,{][ \t]*" js-quoted-string-re "[ \t]*:" ) 1 font-lock-string-face)
;; detects strings and regexes when assigned, passed, returned
;; used as an object key string (i.e. bla["some string"]), when used
;; as a literal object value (i.e. key: "string"), used as an array
;; element, or when they appear as the first expression on a line
;; and a few other hairy cases
(list (concat "[=(:,;[][ \t]*" js-quoted-string-or-regex-re) 1 font-lock-string-face)
(list (concat "^[ \t]*" js-quoted-string-or-regex-re) 1 font-lock-string-face)
(list (concat "return[ \t]*" js-quoted-string-or-regex-re) 1 font-lock-string-face)
;; detect "autoquoted" object properties... clases with "switch { ... default: }"
;; may not be worth the trouble
(list "\\(^[ \t]*\\|[,{][ \t]*\\)\\(\\w+\\):" 2 font-lock-string-face))
"Level one font lock.")
En dan:
Patch is onderweg naar Karl. In de tussentijd kun je hier mijn versie downloaden.