Emacs有BNF模式吗？ [英] Is there a BNF mode for Emacs?

问题描述

我必须以.bnf格式编辑大量语法文件。 Emacs中有没有这种模式？

I have to edit lots of grammar files in .bnf format. Is there a mode for this in Emacs?

我看过了CEDET的语义包，似乎它使用了一个bnf模式，但是没有任何更多。这个片段是可以隐藏的，但是语义bnf模式似乎不存在：

I've looked at CEDET's semantic package, and it seems that it USED to have a bnf-mode, but not any more. This snippet is googlable, but semantic-bnf-mode doesn't seem to exist:

(autoload 'semantic-bnf-mode "semantic-bnf" "Mode for Bovine Normal Form." t)
(add-to-list 'auto-mode-alist '("\\.bnf$" . semantic-bnf-mode))

推荐答案

我改进了代码，这里有一个新版本。

Thanks Don. I improved the code very slightly, here's a new version.

(define-generic-mode 'bnf-mode
  () ;; comment char: inapplicable because # must be at start of line
  nil ;; keywords
  '(
    ("^#.*" . 'font-lock-comment-face) ;; comments at start of line
    ("^<.*?>" . 'font-lock-function-name-face) ;; LHS nonterminals
    ("<.*?>" . 'font-lock-builtin-face) ;; other nonterminals
    ("::=" . 'font-lock-const-face) ;; "goes-to" symbol
    ("\|" . 'font-lock-warning-face) ;; "OR" symbol
    ("\{:\\|:\}" . 'font-lock-keyword-face) ;; special pybnf delimiters
   )
  '("\\.bnf\\'" "\\.pybnf\\'") ;; filename suffixes
  nil ;; extra function hooks
  "Major mode for BNF highlighting.")

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