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+;;; scad.el --- SCAD mode derived mode
+
+;; Author:     Len Trigg
+;; Maintainer: Len Trigg <lenbok@gmail.com>
+;; Created:    March 2010
+;; Modified:   March 2010
+;; Version:    $Revision: 88 $
+
+;; 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 2 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; see the file COPYING.  If not, write to
+;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+;;
+;; This is a separate mode to implement the SCAD constructs and
+;; font-locking.
+;;
+;; To use, insert the following into your emacs startup:
+;;
+;; (autoload 'scad-mode "scad" "Major mode for editing SCAD code." t)
+;; (add-to-list 'auto-mode-alist '("\\.scad$" . scad-mode))
+
+;;; To Do:
+;; - Support for background/debug/root/disable modifiers
+;; - Font lock of non-built-in function calls
+
+;;; Autoload mode trigger
+(add-to-list 'auto-mode-alist '("\\.scad$" . scad-mode))
+
+(defcustom scad-keywords
+  '("return" "true" "false")
+  "SCAD keywords."
+  :type 'list
+  :group 'scad-font-lock)
+
+(defcustom scad-functions
+  '("cos" "acos" "sin" "asin" "tan" "atan" 
+    "pow" "log" "ln"
+    "abs" "min" "max" "sqrt" "round" "ceil" "floor" "lookup" 
+    "str" 
+    "dxf_dim" "dxf_cross"
+    )
+  "SCAD functions."
+  :type 'list
+  :group 'scad-font-lock)
+
+(defcustom scad-modules
+  '("for" "if" "assign" "intersection_for"
+    "echo"
+    "cube" "sphere" "cylinder" "polyhedron" 
+    "scale" "rotate" "translate" "mirror" "multmatrix" "color"
+    "union" "difference" "intersection" "render" "surface"
+    "square" "circle" "polygon" "dxf_linear_extrude" "linear_extrude" "dxf_rotate_extrude" "rotate_extrude"
+    "import_stl" "import_off" "import_dxf" "group"
+    "projection" "minkowski" "glide" "subdiv" "child"
+    )
+  "SCAD modules."
+  :type 'list
+  :group 'scad-font-lock)
+
+(defcustom scad-operators
+  '("+" "-" "*" "/" "%" 
+    "&&" "||" "!" 
+    "<" "<=" "==" "!=" ">" ">="
+    "?" ":" "=")
+  "SCAD operators."
+  :type 'list
+  :group 'scad-font-lock)
+
+(defvar scad-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map "\t" 'scad-indent-line)
+    (define-key map [return] 'newline-and-indent) 
+    map)
+  "Keymap for `scad-mode'.")
+
+(defvar scad-mode-syntax-table
+  (let ((st (make-syntax-table)))
+    ;; support comment style: “// ...” 
+    ;; support comment style: “/* ... */” 
+    (modify-syntax-entry ?\/ ". 124b" st)
+    (modify-syntax-entry ?\n "> b" st)
+    (modify-syntax-entry ?* ". 23" st)
+
+    ;; Extra punctuation
+    (modify-syntax-entry ?+  "." st)
+    (modify-syntax-entry ?-  "." st)
+    (modify-syntax-entry ?%  "." st)
+    (modify-syntax-entry ?<  "." st)
+    (modify-syntax-entry ?>  "." st)
+    (modify-syntax-entry ?&  "." st)
+    (modify-syntax-entry ?:  "." st)
+    (modify-syntax-entry ?|  "." st)
+    (modify-syntax-entry ?=  "." st)
+    (modify-syntax-entry ?\;  "." st)
+
+    ;; _ allowed in word (alternatively "_" as symbol constituent?)
+    (modify-syntax-entry ?_  "w" st)
+
+    st)
+  "Syntax table for `scad-mode'.")
+
+(defvar scad-keywords-regexp (regexp-opt scad-keywords 'words))
+(defvar scad-modules-regexp (regexp-opt scad-modules 'words))
+(defvar scad-functions-regexp (regexp-opt scad-functions 'words))
+(defvar scad-operators-regexp (regexp-opt scad-operators))
+
+(defvar scad-font-lock-keywords
+  `(
+    ("\\(module\\|function\\)[ \t]+\\(\\sw+\\)" (1 'font-lock-keyword-face nil) (2 'font-lock-function-name-face nil t))
+    ("<\\(\\sw+\\)>" (1 'font-lock-builtin-face nil))
+    ("$\\(\\sw+\\)" (1 'font-lock-builtin-face nil))
+    (,scad-keywords-regexp . font-lock-keyword-face)
+    (,scad-modules-regexp .  font-lock-builtin-face)
+    (,scad-functions-regexp .  font-lock-function-name-face)
+    ;(,scad-operators-regexp .  font-lock-operator-face) ;; This actually looks pretty ugly
+    ;("\\(\\<\\S +\\>\\)\\s *(" 1 font-lock-function-name-face t) ;; Seems to override other stuff (e.g. in comments and builtins)
+    )
+  "Keyword highlighting specification for `scad-mode'.")
+
+;(defvar scad-imenu-generic-expression ...)
+;(defvar scad-outline-regexp ...)
+
+;;;###autoload
+(define-derived-mode scad-mode fundamental-mode "SCAD"
+  "A major mode for editing SCAD files."
+  :syntax-table scad-mode-syntax-table
+  (set (make-local-variable 'font-lock-defaults) '(scad-font-lock-keywords))
+  (set (make-local-variable 'indent-line-function) 'scad-indent-line)
+  ;(set (make-local-variable 'imenu-generic-expression) scad-imenu-generic-expression)
+  ;(set (make-local-variable 'outline-regexp) scad-outline-regexp)
+  )
+
+
+;;; Indentation, based on http://www.emacswiki.org/emacs/download/actionscript-mode-haas-7.0.el
+
+(defun scad-indent-line ()
+  "Indent current line of SCAD code."
+  (interactive)
+  (let ((savep (> (current-column) (current-indentation)))
+        (indent (condition-case nil (max (scad-calculate-indentation) 0)
+                  (error 0))))
+    (if savep
+        (save-excursion (indent-line-to indent))
+      (indent-line-to indent))))
+
+(defun scad-calculate-indentation ()
+  "Return the column to which the current line should be indented."
+  (save-excursion
+    (scad-maybe-skip-leading-close-delim)
+    (let ((pos (point)))
+      (beginning-of-line)
+      (if (not (search-backward-regexp "[^\n\t\r ]" 1 0))
+          0
+        (progn
+          (scad-maybe-skip-leading-close-delim)
+          (+ (current-indentation) (* standard-indent (scad-count-scope-depth (point) pos))))))))
+
+(defun scad-maybe-skip-leading-close-delim ()
+  (beginning-of-line)
+  (forward-to-indentation 0)
+  (if (looking-at "\\s)")
+      (forward-char)
+    (beginning-of-line)))
+
+(defun scad-face-at-point (pos)
+  "Return face descriptor for char at point."
+  (plist-get (text-properties-at pos) 'face))
+
+(defun scad-count-scope-depth (rstart rend)
+  "Return difference between open and close scope delimeters."
+  (save-excursion
+    (goto-char rstart)
+    (let ((open-count 0)
+          (close-count 0)
+          opoint)
+      (while (and (< (point) rend)
+                  (progn (setq opoint (point))
+                         (re-search-forward "\\s)\\|\\s(" rend t)))
+        (if (= opoint (point))
+            (forward-char 1)
+          (cond
+           ;; Don't count if in string or comment.
+           ((scad-face-at-point (- (point) 1)))
+           ((looking-back "\\s)")
+            (incf close-count))
+           ((looking-back "\\s(")
+            (incf open-count))
+           )))
+      (- open-count close-count))))
+
+
+(provide 'scad)
+;;; scad.el ends here