branch: master
commit ada08b05a1ff278c1e20d9af60fb22fe9f8e65fc
Author: Stefan Monnier <monn...@iro.umontreal.ca>
Commit: Stefan Monnier <monn...@iro.umontreal.ca>
* rnc-mode: New package
---
packages/rnc-mode/rnc-mode.el | 153 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 153 insertions(+), 0 deletions(-)
diff --git a/packages/rnc-mode/rnc-mode.el b/packages/rnc-mode/rnc-mode.el
new file mode 100644
index 0000000..81f891b
--- /dev/null
+++ b/packages/rnc-mode/rnc-mode.el
@@ -0,0 +1,153 @@
+;;; rnc-mode.el --- Emacs mode to edit Relax-NG Compact files -*-
lexical-binding:t -*-
+
+;; Copyright (C) 1994-1998, 2001-2016 Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monn...@iro.umontreal.ca>
+;; Keywords: xml relaxng
+;; Version: 0.1
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+
+(require 'smie)
+(require 'nxml-mode)
+
+;;; Code:
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.rnc\\'" . rnc-mode))
+
+(defconst rnc-mode-syntax-table
+ (let ((st (make-syntax-table)))
+ (modify-syntax-entry ?# "<" st)
+ (modify-syntax-entry ?\n ">" st)
+ (modify-syntax-entry ?\" "\"" st)
+ (modify-syntax-entry ?- "_" st)
+ (modify-syntax-entry ?. "_" st)
+ (modify-syntax-entry ?: "_" st)
+ (modify-syntax-entry ?_ "_" st)
+ st))
+
+(defconst rnc--keywords
+ ;; Taken from the grammar in http://relaxng.org/compact-20021121.html,
+ ;; by order of appearance.
+ '("namespace" "default" "datatypes" "element" "attribute"
+ "list" "mixed" "parent" "empty" "text" "notAllowed" "external"
+ "grammar" "div" "include" ;; "start"
+ "string" "token" "inherit"))
+
+(defconst rnc--def-regexp "^[ \t]*\\([\\[:alpha:]][[:alnum:]-._]*\\)[ \t]*=")
+
+(defconst rnc-font-lock-keywords
+ `((,rnc--def-regexp (1 font-lock-function-name-face))
+ (,(concat "\\_<" (regexp-opt rnc--keywords) "\\_>")
+ (0 font-lock-keyword-face))
+ ("attribute[ \t\n]+\\([^ ]+\\)" (1 'nxml-attribute-local-name))
+ ;; FIXME: We'd like to use nxml-element-local-name for element names,
+ ;; but by default this looks exactly like font-lock-function-name-face,
+ ;; which we want to use for local pattern definitions.
+ ;; ("element[ \t\n]+\\([^ ]+\\)" (1 'nxml-element-local-name))
+ ))
+
+(defconst rnc-imenu-generic-expression `((nil ,rnc--def-regexp 1)))
+
+(defconst rnc-smie-grammar
+ ;; The body of an RNC file is a sequence of definitions.
+ ;; Problem is: these definitions are not separated by any special keyword.
+ ;; It's basically a repetition of (id "=" pattern), where
+ ;; patterns can end with:
+ ;; "}", ")" "*", "+", "?", id, stringliteral
+ ;; Since this is way beyond the power of SMIE, we resort to using a pseudo
+ ;; " ; " separator which is introduced by the tokenizer.
+ (smie-prec2->grammar
+ (smie-bnf->prec2
+ '((id) (atom) (args)
+ (header (header "include" atom))
+ (decls (id "=" pattern) (id "|=" pattern) (id "&=" pattern)
+ (decls " ; " decls))
+ (pattern ("element" args) ("attribute" args)
+ ("list" args) ("mixed" args)
+ ("parent" id) ("external" id)
+ ("grammar" atom)
+ ("{" pattern "}")
+ (pattern "," pattern)
+ (pattern "&" pattern)
+ (pattern "|" pattern)
+ (pattern "?")
+ (pattern "*")
+ (pattern "+")))
+ ;; The spec says "There is no notion of operator precedence".
+ '((assoc " ; "))
+ '((assoc "," "&" "|") (nonassoc "?" "*" "+"))
+ )))
+
+(defun rnc-smie-forward-token ()
+ (let ((start (point)))
+ (forward-comment (point-max))
+ (if (and (> (point) start)
+ (looking-at "\\(?:\\s_\\|\\sw\\)+[ \t\n]*[|&]?=")
+ (save-excursion
+ (goto-char start)
+ (forward-comment -1)
+ (= (point) start)))
+ " ; "
+ (smie-default-forward-token))))
+
+(defun rnc-smie-backward-token ()
+ (let ((start (point)))
+ (forward-comment (- (point)))
+ (if (and (< (point) start)
+ (let ((pos (point)))
+ (goto-char start)
+ (prog1
+ (looking-at "\\(?:\\s_\\|\\sw\\)+[ \t\n]*[|&]?=")
+ (goto-char pos))))
+ " ; "
+ (smie-default-backward-token))))
+
+(defun rnc-smie-rules (kind token)
+ (pcase (cons kind token)
+ (`(:list-intro . "element") t)
+ (`(:before . ,(or "include" "default" "namespace" "datatypes")) 0)
+ (`(:before . "{")
+ (save-excursion
+ (let ((offset (if (smie-rule-bolp) smie-indent-basic 0))
+ x)
+ (while (or (null (car-safe x))
+ (integerp (car-safe x)))
+ (setq x (smie-backward-sexp 'halfsexp)))
+ (goto-char (nth 1 x))
+ `(column . ,(+ (smie-indent-virtual) offset)))))
+ (`(:after . ,(or "=" "|=" "&=")) smie-indent-basic)
+ (`(:before . ,(or "|" "&" ","))
+ (and (smie-rule-bolp) (smie-rule-parent-p "(" "{") (smie-rule-parent)))
+ (`(,_ . " ; ") (smie-rule-separator kind))
+ ))
+
+;;;###autoload
+(define-derived-mode rnc-mode prog-mode "RNC"
+ "Major mode to edit Relax-NG Compact files."
+ (setq-local comment-start "#")
+ (setq-local font-lock-defaults '(rnc-font-lock-keywords))
+ (setq-local imenu-generic-expression rnc-imenu-generic-expression)
+ (smie-setup rnc-smie-grammar #'rnc-smie-rules
+ :forward-token #'rnc-smie-forward-token
+ :backward-token #'rnc-smie-backward-token))
+
+(provide 'rnc-mode)
+;;; rnc-mode.el ends here
