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;; proof-indent.el Generic Indentation for Proof Assistants
;; Copyright (C) 1997, 1998 LFCS Edinburgh
;; Authors: Healfdene Goguen, Thomas Kleymann and Dilip Sequeira
;; Maintainer: Proof General maintainer <proofgen@dcs.ed.ac.uk>
;;
;; $Id$
;;
(require 'proof) ; loader
(require 'proof-script) ; indent code is for script editing
;; This is quite different from sml-mode, but borrows some bits of
;; code. It's quite a lot less general, but works with nested
;; comments.
;; parse-to-point: If from is nil, parsing starts from either
;; proof-locked-end if we're in the proof-script-buffer or the
;; beginning of the buffer. Otherwise state must contain a valid
;; triple.
(defun proof-parse-to-point (&optional from state)
(let ((cmt-level 0) (stack (list (list nil 0)))
(end (point)) instring c forward-amount
(cmt-end-regexp (regexp-quote proof-comment-end))
(cmt-start-regexp (regexp-quote proof-comment-start)))
(save-excursion
(if (null from)
(goto-char (point-min))
(goto-char from)
(setq instring (car state)
cmt-level (nth 1 state)
stack (nth 2 state)))
(while (< (point) end)
(setq c (char-after (point)))
(setq forward-amount 1) ; may be subject to dynamic scoping!
(cond
;; strings
((and instring (proof-looking-at proof-string-end-regexp))
(setq forward-amount (length (match-string 0)))
(setq instring nil))
(instring)
((proof-looking-at proof-string-start-regexp)
(setq forward-amount (length (match-string 0)))
(setq instring t))
;; comments
((proof-looking-at cmt-start-regexp)
(setq forward-amount (length (match-string 0)))
(incf cmt-level))
((proof-looking-at cmt-end-regexp)
(setq forward-amount (length (match-string 0)))
(decf cmt-level))
((> cmt-level 0))
;; parentheses
((proof-looking-at "\\s(")
(setq stack (cons (list c (point)) stack)))
((proof-looking-at "\\s)")
(setq stack (cdr stack)))
;; basic indentation for commands
((proof-looking-at proof-indent-commands-regexp)
(setq stack (cons (list proof-terminal-char (point)) stack)))
((and (eq c proof-terminal-char)
(eq (car (car stack)) proof-terminal-char))
(setq stack (cdr stack)))
;; prover specific plugin
(proof-parse-indent
(setq stack (funcall proof-parse-indent c stack))))
(forward-char forward-amount))
(list instring cmt-level stack))))
;;;###autoload
(defun proof-indent-line ()
"Indent current line of proof script, if indentation enabled."
(interactive)
(unless (not (proof-ass script-indent))
(if (< (point) (proof-locked-end))
(if (< (current-column) (current-indentation))
(skip-chars-forward "\t "))
(save-excursion
(beginning-of-line)
(let* ((state (proof-parse-to-point))
(beg (point))
(indent (cond
((car state) 1)
((> (nth 1 state) 0) 1)
(t (funcall proof-stack-to-indent (nth 2 state))))))
(skip-chars-forward "\t ")
(if (not (eq (current-indentation) indent))
(progn (delete-region beg (point))
(indent-to indent)))))
(skip-chars-forward "\t "))))
;;;###autoload
(defun proof-indent-region (start end)
(interactive "r")
(if (< (point) (proof-locked-end))
(error "can't indent locked region!"))
(save-excursion
(goto-char start)
(beginning-of-line)
(let* ((beg (point))
(state (proof-parse-to-point))
indent)
;; End of region changes with new indentation
(while (< (point) end)
(setq indent
(cond ((car state) 1)
((> (nth 1 state) 0) 1)
(t (funcall proof-stack-to-indent (nth 2 state)))))
(skip-chars-forward "\t ")
(let ((diff (- (current-indentation) indent)))
(if (not (eq diff 0))
(progn
(delete-region beg (point))
(indent-to indent)
(setq end (- end diff)))))
(end-of-line)
(if (< (point) (point-max)) (forward-char))
(setq state (proof-parse-to-point beg state)
beg (point))))))
(provide 'proof-indent)
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