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;;; nxml-util.el --- utility functions for nxml-*.el -*- lexical-binding:t -*-
;; Copyright (C) 2003, 2007-2024 Free Software Foundation, Inc.
;; Author: James Clark
;; Keywords: wp, hypermedia, languages, XML
;; 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:
(defconst nxml-debug nil
"Enable nxml debugging. Effective only at compile time.")
(defsubst nxml-debug (format &rest args)
(when nxml-debug
(apply #'message format args)))
(defmacro nxml-debug-change (name start end)
(when nxml-debug
`(nxml-debug "%s: %S" ,name
(buffer-substring-no-properties ,start ,end))))
(defun nxml-make-namespace (str)
"Return a symbol for the namespace URI STR.
STR must be a string. If STR is the empty string, return nil.
Otherwise, return the symbol whose name is STR prefixed with a colon."
(if (string-equal str "")
nil
(intern (concat ":" str))))
(defun nxml-namespace-name (ns)
"Return the namespace URI corresponding to the symbol NS.
This is the inverse of `nxml-make-namespace'."
(and ns (substring (symbol-name ns) 1)))
(defconst nxml-xml-namespace-uri
(nxml-make-namespace "http://www.w3.org/XML/1998/namespace"))
(defconst nxml-xmlns-namespace-uri
(nxml-make-namespace "http://www.w3.org/2000/xmlns/"))
(defmacro nxml-with-degradation-on-error (context &rest body)
(declare (indent 1) (debug t))
(if (not nxml-debug)
(let ((error-symbol (make-symbol "err")))
`(condition-case ,error-symbol
(progn ,@body)
(error
(nxml-degrade ,context ,error-symbol))))
`(progn ,@body)))
(defun nxml-display-file-parse-error (err)
(let* ((filename (nth 1 err))
(buffer (find-file-noselect filename))
(pos (nth 2 err))
(message (nth 3 err)))
(pop-to-buffer buffer)
;; What's the right thing to do if the buffer's modified?
;; The position in the saved file could be completely different.
(goto-char (if (buffer-modified-p) 1 pos))
(error "%s" message)))
(defun nxml-signal-file-parse-error (file pos message &optional error-symbol)
(signal (or error-symbol 'nxml-file-parse-error)
(list file pos message)))
(define-error 'nxml-error nil)
(define-error 'nxml-file-parse-error "Error parsing file" 'nxml-error)
(provide 'nxml-util)
;;; nxml-util.el ends here
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