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1 ;;; symbol-syntax.el --- find chars with symbol syntax
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2
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3 ;; Copyright (C) 1992, 1993 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Sun Microsystems.
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5
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6 ;; Created by: JBW, JBW@_CORTEZ
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7 ;; Created on: Wed Jun 20 15:15:34 1990
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8 ;; Last modified by: Ben Wing, wing@666.com
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9 ;; Last modified on: Mon Oct 2 02:32:05 GMT 1995
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10 ;; Filename: symbol-syntax.el
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11 ;; Keywords: matching
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12
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13 ;; This file is part of XEmacs.
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14
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15 ;; XEmacs is free software; you can redistribute it and/or modify it
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16 ;; under the terms of the GNU General Public License as published by
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17 ;; the Free Software Foundation; either version 2, or (at your option)
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18 ;; any later version.
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19
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20 ;; XEmacs is distributed in the hope that it will be useful, but
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21 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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22 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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23 ;; General Public License for more details.
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24
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25 ;; You should have received a copy of the GNU General Public License
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26 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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27 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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28
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29 ;;; Synched up with: Not in FSF.
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30
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31 (defvar symbol-syntax-table-alist nil)
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32 ;; '((c-mode-syntax-table)
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33 ;; (emacs-lisp-mode-syntax-table)
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34 ;; (lisp-mode-syntax-table)
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35 ;; (text-mode-syntax-table)))
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36
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37 (defun update-symbol-syntax-table-alist ()
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38 (let ((alist symbol-syntax-table-alist)
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39 item)
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40 (while (consp alist)
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41 (cond ((null (car alist))
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42 (error "Missing alist item"))
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43 ((null (car (car alist)))
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44 (error "Alist item with null car"))
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45 ;; this functionality not used
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46 ((symbolp (setq item (car (car alist))))
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47 (or (null (cdr (car alist)))
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48 (error "Alist item expected to have null cdr"))
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49 (while (symbolp item)
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50 (setq item (symbol-value item)))
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51 (setcar (car alist) item)))
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52 (cond ((not (syntax-table-p (car (car alist))))
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53 (error "Alist item car expected to be symbol table"))
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54 ((null (cdr (car alist)))
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55 (setcdr (car alist)
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56 (make-symbol-syntax-table (car (car alist))))))
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57 (setq alist (cdr alist)))))
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58
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59 (defun get-symbol-syntax-table (norm-table)
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60 (let (result)
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61 (if (setq result (assq norm-table symbol-syntax-table-alist))
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62 nil
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63 (update-symbol-syntax-table-alist)
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64 (if (setq result (assq norm-table symbol-syntax-table-alist))
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65 nil
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66 (setq symbol-syntax-table-alist
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67 (cons (list norm-table)
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68 symbol-syntax-table-alist))
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69 (update-symbol-syntax-table-alist)
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70 (or (setq result (assq norm-table symbol-syntax-table-alist))
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71 (error "Syntax table missing from symbol-syntax-table-alist"))))
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72 (or (setq result (cdr result))
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73 (error "Alist item has null cdr"))
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74 (or (syntax-table-p result)
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75 (error "Non-syntax-table item in alist"))
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76 result))
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77
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78 (defun make-symbol-syntax-table (in-table)
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79 (let ((osyn (syntax-table))
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80 (out-table (copy-syntax-table in-table))
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81 (i 0)
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82 (syntax nil))
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83 (while (< i 256)
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84 (setq syntax (aref out-table i))
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85 (if (eq 3 (logand 255 syntax))
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86 (aset out-table i (logior 2 (logand (lognot 255) syntax))))
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87 (setq i (1+ i)))
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88 out-table))
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89
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90 ;; stuff for examining contents of syntax tables
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91 ;;(show-chars-with-syntax
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92 ;; '(c-mode-syntax-table
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93 ;; emacs-lisp-mode-syntax-table
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94 ;; lisp-mode-syntax-table
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95 ;; text-mode-syntax-table)
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96 ;; ?_)
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97
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98 (defun show-chars-with-syntax (tables syntax)
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99 (let ((osyn (syntax-table))
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100 (schars nil))
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101 (unwind-protect
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102 (while (consp tables)
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103 (let* ((chars nil)
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104 (table-symbol (car tables))
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105 (table table-symbol)
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106 (i 0))
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107 (or (symbolp table-symbol)
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108 (error "bad argument non-symbol"))
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109 (while (symbolp table)
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110 (setq table (symbol-value table)))
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111 (set-syntax-table table)
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112 (while (< i 256)
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113 (if (eq syntax (char-syntax i))
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114 (setq chars (cons (format "%c" i) chars)))
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115 (setq i (1+ i)))
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116 (setq schars (cons (list table-symbol
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117 (mapconcat 'identity (nreverse chars) ""))
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118 schars)))
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119 (setq tables (cdr tables)))
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120 (set-syntax-table osyn))
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121 (nreverse schars)))
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122
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123 (provide 'symbol-syntax)
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