;;; rng-util.el --- utility functions for RELAX NG library  -*- lexical-binding: t; -*-

;; Copyright (C) 2003, 2007-2025 Free Software Foundation, Inc.

;; Author: James Clark
;; Keywords: text, hypermedia, languages, XML, RelaxNG

;; This file is part of GNU Emacs.

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(require 'cl-lib)

(defun rng-make-datatypes-uri (uri)
  (if (string-equal uri "")
      ;; The spec doesn't say to do this, but it's perfectly conformant
      ;; and better than using nil, I think.
      'http://relaxng.org/ns/structure/1.0
    (intern uri)))

(defconst rng-xsd-datatypes-uri
  (rng-make-datatypes-uri "http://www.w3.org/2001/XMLSchema-datatypes"))

(defconst rng-builtin-datatypes-uri (rng-make-datatypes-uri ""))

(defun rng-substq (new old list)
  "Replace first member of LIST (if any) that is `eq' to OLD by NEW.
LIST is not modified."
  (cl-substitute new old list :count 1 :test #'eq))

(defun rng-escape-string (s)
  (replace-regexp-in-string "[&\"<>]"
			    (lambda (match)
			      (cdr (assoc match
					  '(("&" . "&amp;")
					    ("\"" . "&quot;")
					    (">" . "&gt;")
					    ("<" . "&lt;")))))
			    s
			    t))

(define-error 'rng-error nil)

(defun rng-uniquify-eq (list)
  (declare (obsolete seq-uniq "28.1"))
  (seq-uniq list #'eq))

(define-obsolete-function-alias 'rng-uniquify-equal #'seq-uniq "28.1")
(define-obsolete-function-alias 'rng-blank-p #'string-blank-p "29.1")
(define-obsolete-function-alias 'rng-collapse-space #'string-clean-whitespace "29.1")

(provide 'rng-util)

;;; rng-util.el ends here