lisp/mim-syntax.el

   1 ;;; mim-syntax.el --- syntax checker for Mim (MDL).
   2
   3 ;; Author: K. Shane Hartman
   4 ;; Maintainer: FSF
   5 ;; Last-Modified: 31 Oct 1989
   6
   7 ;; Copyright (C) 1985 Free Software Foundation, Inc.
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Code:
  26
  27 (require 'mim-mode)
  28
  29 (defun slow-syntax-check-mim ()
  30   "Check Mim syntax slowly.
  31 Points out the context of the error, if the syntax is incorrect."
  32   (interactive)
  33   (message "checking syntax...")
  34   (let ((stop (point-max)) point-stack current last-bracket whoops last-point)
  35     (save-excursion
  36       (goto-char (point-min))
  37       (while (and (not whoops)
  38                   (re-search-forward "\\s(\\|\\s)\\|\"\\|[\\]" stop t))
  39         (setq current (preceding-char))
  40         (cond ((= current ?\")
  41                (condition-case nil
  42                    (progn (re-search-forward "[^\\]\"")
  43                           (setq current nil))
  44                  (error (setq whoops (point)))))
  45               ((= current ?\\)
  46                (condition-case nil (forward-char 1) (error nil)))
  47               ((= (char-syntax current) ?\))
  48                (if (or (not last-bracket)
  49                        (not (= (logand (lsh (aref (syntax-table) last-bracket) -8)
  50                                        ?\177)
  51                                current)))
  52                    (setq whoops (point))
  53                  (setq last-point (car point-stack))
  54                  (setq last-bracket (if last-point (char-after (1- last-point))))
  55                  (setq point-stack (cdr point-stack))))
  56               (t
  57                (if last-point (setq point-stack (cons last-point point-stack)))
  58                (setq last-point (point))
  59                (setq last-bracket current)))))
  60     (cond ((not (or whoops last-point))
  61            (message "Syntax correct"))
  62           (whoops
  63            (goto-char whoops)
  64            (cond ((equal current ?\")
  65                   (error "Unterminated string"))
  66                  ((not last-point)
  67                   (error "Extraneous %s" (char-to-string current)))
  68                  (t
  69                   (error "Mismatched %s with %s"
  70                            (save-excursion
  71                              (setq whoops (1- (point)))
  72                              (goto-char (1- last-point))
  73                              (buffer-substring (point)
  74                                                (min (progn (end-of-line) (point))
  75                                                     whoops)))
  76                            (char-to-string current)))))
  77           (t
  78            (goto-char last-point)
  79            (error "Unmatched %s" (char-to-string last-bracket))))))
  80
  81 (defun fast-syntax-check-mim ()
  82   "Checks Mim syntax quickly.
  83 Answers correct or incorrect, cannot point out the error context."
  84   (interactive)
  85   (save-excursion
  86     (goto-char (point-min))
  87     (let (state)
  88       (while (and (not (eobp))
  89                   (equal (car (setq state (parse-partial-sexp (point) (point-max) 0)))
  90                          0)))
  91       (if (equal (car state) 0)
  92           (message "Syntax correct")
  93         (error "Syntax incorrect")))))
  94
  95 ;;; mim-syntax.el ends here