lisp/mim-syntax.el

   1 ;;; mim-syntax.el --- syntax checker for Mim (MDL).
   2
   3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
   4 ;; Principal author K. Shane Hartman
   5
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation; either version 1, or (at your option)
  11 ;; any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  20 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22
  23 (require 'mim-mode)
  24
  25 (defun slow-syntax-check-mim ()
  26   "Check Mim syntax slowly.
  27 Points out the context of the error, if the syntax is incorrect."
  28   (interactive)
  29   (message "checking syntax...")
  30   (let ((stop (point-max)) point-stack current last-bracket whoops last-point)
  31     (save-excursion
  32       (goto-char (point-min))
  33       (while (and (not whoops)
  34                   (re-search-forward "\\s(\\|\\s)\\|\"\\|[\\]" stop t))
  35         (setq current (preceding-char))
  36         (cond ((= current ?\")
  37                (condition-case nil
  38                    (progn (re-search-forward "[^\\]\"")
  39                           (setq current nil))
  40                  (error (setq whoops (point)))))
  41               ((= current ?\\)
  42                (condition-case nil (forward-char 1) (error nil)))
  43               ((= (char-syntax current) ?\))
  44                (if (or (not last-bracket)
  45                        (not (= (logand (lsh (aref (syntax-table) last-bracket) -8)
  46                                        ?\177)
  47                                current)))
  48                    (setq whoops (point))
  49                  (setq last-point (car point-stack))
  50                  (setq last-bracket (if last-point (char-after (1- last-point))))
  51                  (setq point-stack (cdr point-stack))))
  52               (t
  53                (if last-point (setq point-stack (cons last-point point-stack)))
  54                (setq last-point (point))
  55                (setq last-bracket current)))))
  56     (cond ((not (or whoops last-point))
  57            (message "Syntax correct"))
  58           (whoops
  59            (goto-char whoops)
  60            (cond ((equal current ?\")
  61                   (error "Unterminated string"))
  62                  ((not last-point)
  63                   (error "Extraneous %s" (char-to-string current)))
  64                  (t
  65                   (error "Mismatched %s with %s"
  66                            (save-excursion
  67                              (setq whoops (1- (point)))
  68                              (goto-char (1- last-point))
  69                              (buffer-substring (point)
  70                                                (min (progn (end-of-line) (point))
  71                                                     whoops)))
  72                            (char-to-string current)))))
  73           (t
  74            (goto-char last-point)
  75            (error "Unmatched %s" (char-to-string last-bracket))))))
  76
  77 (defun fast-syntax-check-mim ()
  78   "Checks Mim syntax quickly.
  79 Answers correct or incorrect, cannot point out the error context."
  80   (interactive)
  81   (save-excursion
  82     (goto-char (point-min))
  83     (let (state)
  84       (while (and (not (eobp))
  85                   (equal (car (setq state (parse-partial-sexp (point) (point-max) 0)))
  86                          0)))
  87       (if (equal (car state) 0)
  88           (message "Syntax correct")
  89         (error "Syntax incorrect")))))
  90
  91 ;;; mim-syntax.el ends here