;;; smie.el --- Simple Minded Indentation Engine -*- lexical-binding: t -*-
-;; Copyright (C) 2010-2011 Free Software Foundation, Inc.
+;; Copyright (C) 2010-2012 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: languages, lisp, internal, parsing, indentation
;; building the 2D precedence tables and then computing the precedence levels
;; from it) can be found in pages 187-194 of "Parsing techniques" by Dick Grune
;; and Ceriel Jacobs (BookBody.pdf available at
-;; http://www.cs.vu.nl/~dick/PTAPG.html).
+;; http://dickgrune.com/Books/PTAPG_1st_Edition/).
;;
;; OTOH we had to kill many chickens, read many coffee grounds, and practice
;; untold numbers of black magic spells, to come up with the indentation code.
(save-excursion (indent-line-to indent))
(indent-line-to indent)))))
+(defun smie-auto-fill ()
+ (let ((fc (current-fill-column)))
+ (while (and fc (> (current-column) fc))
+ (cond
+ ((not (or (nth 8 (save-excursion
+ (syntax-ppss (line-beginning-position))))
+ (nth 8 (syntax-ppss))))
+ (save-excursion
+ (beginning-of-line)
+ (smie-indent-forward-token)
+ (let ((bsf (point))
+ (gain 0)
+ curcol)
+ (while (<= (setq curcol (current-column)) fc)
+ ;; FIXME? `smie-indent-calculate' can (and often will)
+ ;; return a result that actually depends on the presence/absence
+ ;; of a newline, so the gain computed here may not be accurate,
+ ;; but in practice it seems to works well enough.
+ (let* ((newcol (smie-indent-calculate))
+ (newgain (- curcol newcol)))
+ (when (> newgain gain)
+ (setq gain newgain)
+ (setq bsf (point))))
+ (smie-indent-forward-token))
+ (when (> gain 0)
+ (goto-char bsf)
+ (newline-and-indent)))))
+ (t (do-auto-fill))))))
+
+
(defun smie-setup (grammar rules-function &rest keywords)
"Setup SMIE navigation and indentation.
GRAMMAR is a grammar table generated by `smie-prec2->grammar'.
(set (make-local-variable 'smie-rules-function) rules-function)
(set (make-local-variable 'smie-grammar) grammar)
(set (make-local-variable 'indent-line-function) 'smie-indent-line)
+ (set (make-local-variable 'normal-auto-fill-function) 'smie-auto-fill)
(set (make-local-variable 'forward-sexp-function)
'smie-forward-sexp-command)
(while keywords