lisp/mim-syntax.el

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