view lisp/symbol-syntax.el @ 2362:6aa56b089139

[xemacs-hg @ 2004-11-02 09:51:04 by ben] To: xemacs-patches@xemacs.org internals/index.texi: Deleted. Incorporated into internals.texi. Having a separate index file messes up texinfo-master-menu. internals/internals.texi: Add bunches and bunches and bunches and bunches of stuff, taken from documentation floating around in various places -- text.c, file-coding.c, other .c and .h files, stuff that I wrote up for an old XEmacs contract, proposals written up in the process of an e-mail discussion, etc. Fix up some mistakes, esp. in CCL. Extra crap from CCL, duplicated with Lispref, removed. Sections on Old Future Work and Future Work Discussion added. Bunches of other work. Add bunches of documentation taken from the source code. Fixup various places to use @strong{}, @code{}, @file{}. Create new Text chapter, split off from Buffers and Textual Representation. Create new chapter for MS Windows, mostly written from scratch. Consolidate all Mule info under "Multilingual Support". Break up chapter on modules and move some parts to the sections discussing the modules, for consolidation purposes. Add a big cross-reference table for all the modules to where they're discussed (or not). New chapter Asynchronous Events; Quit Checking. (Taken from various parts of the code.) New Introduction. New section on Focus Handling (from the code). NOTE that in the process, I discovered that we essentially have FOUR redundant introductions to Mule issues! Someone really needs to go through and clean them up and integrate them (sjt?).
author ben
date Tue, 02 Nov 2004 09:51:18 +0000 (2004-11-02)
parents 3ecd8885ac67
children 308d34e9f07d
line wrap: on
line source
;;; symbol-syntax.el --- find chars with symbol syntax

;; Copyright (C) 1992, 1993, 1997 Free Software Foundation, Inc.
;; Copyright (C) 1995 Sun Microsystems.

;; Author: JBW, JBW@_CORTEZ
;; Created: Wed Jun 20 15:15:34 1990
;; Maintainer: XEmacs Development Team
;; Keywords: matching

;; This file is part of XEmacs.

;; XEmacs is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; XEmacs is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING.  If not, write to the 
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Synched up with: Not in FSF.

;;; Commentary:

;; Last modified by: Ben Wing, ben@xemacs.org
;; Last modified on: Mon Oct  2 02:32:05 GMT 1995

;;; Code:

(defvar symbol-syntax-table-alist nil)
;;  '((c-mode-syntax-table)
;;    (emacs-lisp-mode-syntax-table)
;;    (lisp-mode-syntax-table)
;;    (text-mode-syntax-table)))

(defun update-symbol-syntax-table-alist ()
  (let ((alist symbol-syntax-table-alist)
	item)
    (while (consp alist)
      (cond ((null (car alist))
	     (error "Missing alist item"))
	    ((null (car (car alist)))
	     (error "Alist item with null car"))
	    ;; this functionality not used
	    ((symbolp (setq item (car (car alist))))
	     (or (null (cdr (car alist)))
		 (error "Alist item expected to have null cdr"))
	     (while (symbolp item)
	       (setq item (symbol-value item)))
	     (setcar (car alist) item)))
      (cond ((not (syntax-table-p (car (car alist))))
	     (error "Alist item car expected to be symbol table"))
	    ((null (cdr (car alist)))
	     (setcdr (car alist)
		     (make-symbol-syntax-table (car (car alist))))))
      (setq alist (cdr alist)))))

(defun get-symbol-syntax-table (norm-table)
  (let (result)
    (if (setq result (assq norm-table symbol-syntax-table-alist))
	nil
      (update-symbol-syntax-table-alist)
      (if (setq result (assq norm-table symbol-syntax-table-alist))
	  nil
	(setq symbol-syntax-table-alist
	      (cons (list norm-table)
		    symbol-syntax-table-alist))
	(update-symbol-syntax-table-alist)
	(or (setq result (assq norm-table symbol-syntax-table-alist))
	    (error "Syntax table missing from symbol-syntax-table-alist"))))
    (or (setq result (cdr result))
	(error "Alist item has null cdr"))
    (or (syntax-table-p result)
	(error "Non-syntax-table item in alist"))
    result))

(defun make-symbol-syntax-table (in-table)
  (let ((out-table (copy-syntax-table in-table)))
    (map-syntax-table
     #'(lambda (key value)
	 (if (eq ?_ (char-syntax-from-code value))
	     (put-char-table key (set-char-syntax-in-code value ?w)
			     out-table))
	 nil)
     out-table)
    out-table))

;; stuff for examining contents of syntax tables
;;(show-chars-with-syntax
;; '(c-mode-syntax-table
;;   emacs-lisp-mode-syntax-table
;;   lisp-mode-syntax-table
;;   text-mode-syntax-table)
;; ?_)

(defun show-chars-with-syntax (tables syntax)
  (let ((schars nil))
    (unwind-protect
	(while (consp tables)
	  (let* ((chars nil)
		 (table-symbol (car tables))
		 (table table-symbol))
	    (or (symbolp table-symbol)
		(error "bad argument non-symbol"))
	    (while (symbolp table)
	      (setq table (symbol-value table)))
	    (map-syntax-table
	     #'(lambda (key value)
		 (if (eq syntax (char-syntax-from-code value))
		     (setq chars (cons key chars)))
		 nil)
	     table)
	    (setq schars (cons (list table-symbol (nreverse chars))
			       schars)))
	  (setq tables (cdr tables))))
    (nreverse schars)))

(provide 'symbol-syntax)

;;; symbol-syntax.el ends here