;;; arduino-mode.el --- Major mode for the Arduino language

;; Copyright (C) 2008  Christopher Grim

;; Author: Christopher Grim <christopher.grim@gmail.com>
;; Keywords: languages, arduino

;; This file 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, or (at your option)
;; any later version.

;; This file 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; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:
;;
;; Based on derived-mode-ex.el found here:
;;
;; <http://cc-mode.sourceforge.net/derived-mode-ex.el>.
;;

;;; Code:
(require 'cc-mode)

(eval-when-compile
  (require 'cc-langs)
  (require 'cc-fonts)
  (require 'cc-menus))

(eval-and-compile
  ;; fall back on c-mode
  (c-add-language 'arduino-mode 'c-mode))

(c-lang-defconst c-primitive-type-kwds
  arduino (append '("boolean" "byte")
                  (c-lang-const c-primitive-type-kwds)))

(c-lang-defconst c-constant-kwds
  arduino (append '("HIGH" "LOW" "INPUT" "OUTPUT")
                  (c-lang-const c-constant-kwds)))

(c-lang-defconst c-simple-stmt-kwds
  arduino (append '("pinMode" "digitalWrite" "digitalRead"                      ; Digital I/O
                    "analogRead" "analogWrite"                                  ; Analog I/O
                    "shiftOut" "pulseIn"                                        ; Advanced I/O
                    "millis" "delay" "delayMicroseconds"                        ; Time
                    "min" "max" "abs" "constrain" "map" "pow" "sq" "sqrt" "sin" ; Math
                    "sin" "cos" "tan"                                           ; Trigonometry
                    "randomSeed" "random"                                       ; Random Numbers
                    "attachInterrupt" "detachInterrupt"                         ; External Interrupts
                    "interrupts" "noInterrupts"                                 ; Interrupts
                    "begin" "available" "read" "flush" "print" "println")       ; Serial Communication
                  (c-lang-const c-simple-stmt-kwds)))

(c-lang-defconst c-primary-expr-kwds
  arduino (append '("Serial")
                  (c-lang-const c-primary-expr-kwds)))

(defgroup arduino nil "Arduino mode customizations")

(defcustom arduino-font-lock-extra-types nil
  "*List of extra types (aside from the type keywords) to recognize in Arduino mode.
Each list item should be a regexp matching a single identifier." :group 'arduino)

(defconst arduino-font-lock-keywords-1 (c-lang-const c-matchers-1 arduino)
  "Minimal highlighting for Arduino mode.")

(defconst arduino-font-lock-keywords-2 (c-lang-const c-matchers-2 arduino)
  "Fast normal highlighting for Arduino mode.")

(defconst arduino-font-lock-keywords-3 (c-lang-const c-matchers-3 arduino)
  "Accurate normal highlighting for Arduino mode.")

(defvar arduino-font-lock-keywords arduino-font-lock-keywords-3
  "Default expressions to highlight in ARDUINO mode.")

(defvar arduino-mode-syntax-table nil
  "Syntax table used in arduino-mode buffers.")
(or arduino-mode-syntax-table
    (setq arduino-mode-syntax-table
          (funcall (c-lang-const c-make-mode-syntax-table arduino))))

(defvar arduino-mode-abbrev-table nil
  "Abbreviation table used in arduino-mode buffers.")

(c-define-abbrev-table 'arduino-mode-abbrev-table
  ;; Keywords that if they occur first on a line might alter the
  ;; syntactic context, and which therefore should trig reindentation
  ;; when they are completed.
  '(("else" "else" c-electric-continued-statement 0)
    ("while" "while" c-electric-continued-statement 0)))

(defvar arduino-mode-map (let ((map (c-make-inherited-keymap)))
                      ;; Add bindings which are only useful for Arduino
                      map)
  "Keymap used in arduino-mode buffers.")

(easy-menu-define arduino-menu arduino-mode-map "Arduino Mode Commands"
                  (cons "Arduino" (c-lang-const c-mode-menu arduino)))

;;;###autoload
(add-to-list 'auto-mode-alist '("\\.pde\\'" . arduino-mode))

;;;###autoload
(defun arduino-mode ()
  "Major mode for editing Arduino code.

The hook `c-mode-common-hook' is run with no args at mode
initialization, then `arduino-mode-hook'.

Key bindings:
\\{arduino-mode-map}"
  (interactive)
  (kill-all-local-variables)
  (c-initialize-cc-mode t)
  (set-syntax-table arduino-mode-syntax-table)
  (setq major-mode 'arduino-mode
        mode-name "Arduino"
        local-abbrev-table arduino-mode-abbrev-table
        abbrev-mode t
        imenu-generic-expression cc-imenu-c-generic-expression)
  (use-local-map c-mode-map)
  ;; `c-init-language-vars' is a macro that is expanded at compile
  ;; time to a large `setq' with all the language variables and their
  ;; customized values for our language.
  (c-init-language-vars arduino-mode)
  ;; `c-common-init' initializes most of the components of a CC Mode
  ;; buffer, including setup of the mode menu, font-lock, etc.
  ;; There's also a lower level routine `c-basic-common-init' that
  ;; only makes the necessary initialization to get the syntactic
  ;; analysis and similar things working.
  (c-common-init 'arduino-mode)
  (easy-menu-add arduino-menu)
  (run-hooks 'c-mode-common-hook)
  (run-hooks 'arduino-mode-hook)
  (c-update-modeline))

(provide 'arduino-mode)
;;; arduino-mode.el ends here