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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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16
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26 ;; along with XEmacs; see the file COPYING. If not, write to the
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27 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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28 ;; Boston, MA 02111-1307, USA.
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29
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30 ;;; Synched up with: Not in FSF.
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31
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32 (defvar symbol-syntax-table-alist nil)
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33 ;; '((c-mode-syntax-table)
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34 ;; (emacs-lisp-mode-syntax-table)
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35 ;; (lisp-mode-syntax-table)
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36 ;; (text-mode-syntax-table)))
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37
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38 (defun update-symbol-syntax-table-alist ()
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39 (let ((alist symbol-syntax-table-alist)
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40 item)
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41 (while (consp alist)
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42 (cond ((null (car alist))
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43 (error "Missing alist item"))
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44 ((null (car (car alist)))
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45 (error "Alist item with null car"))
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46 ;; this functionality not used
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47 ((symbolp (setq item (car (car alist))))
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48 (or (null (cdr (car alist)))
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49 (error "Alist item expected to have null cdr"))
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50 (while (symbolp item)
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51 (setq item (symbol-value item)))
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52 (setcar (car alist) item)))
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53 (cond ((not (syntax-table-p (car (car alist))))
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54 (error "Alist item car expected to be symbol table"))
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55 ((null (cdr (car alist)))
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56 (setcdr (car alist)
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57 (make-symbol-syntax-table (car (car alist))))))
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58 (setq alist (cdr alist)))))
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59
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60 (defun get-symbol-syntax-table (norm-table)
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61 (let (result)
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62 (if (setq result (assq norm-table symbol-syntax-table-alist))
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63 nil
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64 (update-symbol-syntax-table-alist)
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65 (if (setq result (assq norm-table symbol-syntax-table-alist))
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66 nil
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67 (setq symbol-syntax-table-alist
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68 (cons (list norm-table)
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69 symbol-syntax-table-alist))
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70 (update-symbol-syntax-table-alist)
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71 (or (setq result (assq norm-table symbol-syntax-table-alist))
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72 (error "Syntax table missing from symbol-syntax-table-alist"))))
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73 (or (setq result (cdr result))
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74 (error "Alist item has null cdr"))
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75 (or (syntax-table-p result)
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76 (error "Non-syntax-table item in alist"))
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77 result))
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78
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79 (defun make-symbol-syntax-table (in-table)
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70
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80 (let ((out-table (copy-syntax-table in-table)))
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81 (map-syntax-table
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82 #'(lambda (key value)
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83 (if (eq ?_ (char-syntax-from-code value))
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84 (put-char-table key (set-char-syntax-in-code value ?w)
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85 out-table))
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86 nil)
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87 out-table)
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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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70
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111 (map-syntax-table
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112 #'(lambda (key value)
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113 (if (eq syntax (char-syntax-from-code value))
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114 (setq chars (cons key chars)))
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115 nil)
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116 table)
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117 (setq schars (cons (list table-symbol (nreverse chars))
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118 schars)))
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70
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119 (setq tables (cdr tables))))
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120 (nreverse schars)))
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121
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122 (provide 'symbol-syntax)
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