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dts-mode.el
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dts-mode.el
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;;; dts-mode.el --- Major mode for Devicetree source code
;; Copyright (C) 2014 Ben Gamari
;; Version: 0.1.0
;; Author: Ben Gamari <ben@smart-cactus.org>
;; Keywords: languages
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(defconst dts-re-ident "\\([[:word:]_][[:word:][:multibyte:]_,[:digit:]-]*\\)")
(defvar dts-mode-font-lock-keywords
`(
;; names like `name: hi {`
(,(concat dts-re-ident ":") 1 font-lock-variable-name-face)
;; nodes
(,(concat dts-re-ident "\\(@[[:xdigit:]]+\\)?[[:space:]]*{") 1 font-lock-type-face)
;; assignments
(,(concat dts-re-ident "[[:space:]]*=") 1 font-lock-variable-name-face)
(,(concat dts-re-ident "[[:space:]]*;") 1 font-lock-variable-name-face)
;; references
(,(concat "\\&" dts-re-ident) 1 font-lock-variable-name-face)
)
)
(defvar dts-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?< "(>" table)
(modify-syntax-entry ?> ")<" table)
(modify-syntax-entry ?& "." table)
(modify-syntax-entry ?| "." table)
(modify-syntax-entry ?& "." table)
(modify-syntax-entry ?~ "." table)
;; _ and , are both word characters
(modify-syntax-entry ?, "_" table)
(modify-syntax-entry ?_ "w" table)
;; Strings
(modify-syntax-entry ?\" "\"" table)
(modify-syntax-entry ?\\ "\\" table)
;; Comments
(modify-syntax-entry ?/ ". 124b" table)
(modify-syntax-entry ?* ". 23" table)
(modify-syntax-entry ?\n "> b" table)
(modify-syntax-entry ?\^m "> b" table)
table))
(defun dts--calculate-indentation ()
(interactive)
(save-excursion
(let ((end (point-at-eol))
(cnt 0)
(initial-point (point)))
(goto-char 0)
(while (re-search-forward "\\([{}]\\)" end t)
(if (string= (match-string-no-properties 0) "{")
(setq cnt (1+ cnt))
(setq cnt (1- cnt))))
;; subtract one if the current line has an opening brace since we
;; shouldn't add the indentation level until the following line
(goto-char initial-point)
(beginning-of-line)
(when (re-search-forward "{" (point-at-eol) t)
(setq cnt (1- cnt)))
cnt)))
(defun dts-indent-line ()
(interactive)
(let ((indent (dts--calculate-indentation)))
(save-excursion
(indent-line-to (* indent tab-width)))
(when (or (bolp) (looking-back "^[[:space:]]+"))
(beginning-of-line-text))))
(defalias 'dts-parent-mode
(if (fboundp 'prog-mode) 'prog-mode 'fundamental-mode))
;;;###autoload
(define-derived-mode dts-mode dts-parent-mode "Devicetree"
"Major mode for editing Devicetrees"
:group 'dts-mode
:syntax-table dts-mode-syntax-table
;; Fonts
(set (make-local-variable 'font-lock-defaults) '(dts-mode-font-lock-keywords nil nil nil nil))
(set (make-local-variable 'comment-start) "/* ")
(set (make-local-variable 'comment-end) " */")
(set (make-local-variable 'comment-multi-line) t)
(set (make-local-variable 'indent-line-function) 'dts-indent-line))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.dts\\'" . dts-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.dtsi\\'" . dts-mode))
(provide 'dts-mode)
;;; dts-mode.el ends here