lisp/nxml/rng-util.el

   1 ;;; rng-util.el --- utility functions for RELAX NG library
   2
   3 ;; Copyright (C) 2003, 2007-2018 Free Software Foundation, Inc.
   4
   5 ;; Author: James Clark
   6 ;; Keywords: wp, hypermedia, languages, XML, RelaxNG
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (defun rng-make-datatypes-uri (uri)
  28   (if (string-equal uri "")
  29       ;; The spec doesn't say to do this, but it's perfectly conformant
  30       ;; and better than using nil, I think.
  31       'http://relaxng.org/ns/structure/1.0
  32     (intern uri)))
  33
  34 (defconst rng-xsd-datatypes-uri
  35   (rng-make-datatypes-uri "http://www.w3.org/2001/XMLSchema-datatypes"))
  36
  37 (defconst rng-builtin-datatypes-uri (rng-make-datatypes-uri ""))
  38
  39 (defun rng-uniquify-eq (list)
  40   "Destructively remove `eq' duplicates from LIST."
  41   (and list
  42        (let ((head list))
  43          (while (cdr head)
  44            (if (eq (car head) (cadr head))
  45                (setcdr head (cddr head)))
  46            (setq head (cdr head)))
  47          list)))
  48
  49 (defun rng-uniquify-equal (list)
  50   "Destructively remove `equal' duplicates from LIST."
  51   (and list
  52        (let ((head list))
  53          (while (cdr head)
  54            (if (equal (car head) (cadr head))
  55                (setcdr head (cddr head)))
  56            (setq head (cdr head)))
  57          list)))
  58
  59 (defun rng-blank-p (str) (string-match "\\`[ \t\n\r]*\\'" str))
  60
  61 (defun rng-substq (new old list)
  62   "Replace first member of LIST (if any) that is `eq' to OLD by NEW.
  63 LIST is not modified."
  64   (cond ((null list) nil)
  65         ((eq (car list) old)
  66          (cons new (cdr list)))
  67         (t
  68          (let ((tail (cons (car list)
  69                            nil))
  70                (rest (cdr list)))
  71            (setq list tail)
  72            (while rest
  73              (let ((item (car rest)))
  74                (setq rest (cdr rest))
  75                (cond ((eq item old)
  76                       (setcdr tail
  77                               (cons new rest))
  78                       (setq rest nil))
  79                      (t
  80                       (setq tail
  81                             (setcdr tail
  82                                     (cons item nil))))))))
  83          list)))
  84
  85 (defun rng-escape-string (s)
  86   (replace-regexp-in-string "[&\"<>]"
  87                             (lambda (match)
  88                               (cdr (assoc match
  89                                           '(("&" . "&amp;")
  90                                             ("\"" . "&quot;")
  91                                             (">" . "&gt;")
  92                                             ("<" . "&lt;")))))
  93                             s
  94                             t))
  95
  96 (defun rng-collapse-space (string)
  97   (setq string
  98         (replace-regexp-in-string "[ \t\r\n]+" " " string t t))
  99   (when (string-match "\\` " string)
 100     (setq string (substring string 1)))
 101   (when (string-match " \\'" string)
 102     (setq string (substring string 0 -1)))
 103   string)
 104
 105 (define-error 'rng-error nil)
 106
 107 (provide 'rng-util)
 108
 109 ;;; rng-util.el ends here