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136 lines
4.5 KiB
EmacsLisp
136 lines
4.5 KiB
EmacsLisp
;;; nxml-util.el --- utility functions for nxml-*.el
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;; Copyright (C) 2003, 2007-2011 Free Software Foundation, Inc.
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;; Author: James Clark
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;; Keywords: XML
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(defconst nxml-debug nil
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"Enable nxml debugging. Effective only at compile time.")
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(defsubst nxml-debug (format &rest args)
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(when nxml-debug
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(apply #'message format args)))
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(defmacro nxml-debug-change (name start end)
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(when nxml-debug
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`(nxml-debug "%s: %S" ,name
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(buffer-substring-no-properties ,start ,end))))
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(defmacro nxml-debug-set-inside (start end)
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(when nxml-debug
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`(let ((overlay (make-overlay ,start ,end)))
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(overlay-put overlay 'face '(:background "red"))
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(overlay-put overlay 'nxml-inside-debug t)
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(nxml-debug-change "nxml-set-inside" ,start ,end))))
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(defmacro nxml-debug-clear-inside (start end)
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(when nxml-debug
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`(loop for overlay in (overlays-in ,start ,end)
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if (overlay-get overlay 'nxml-inside-debug)
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do (delete-overlay overlay)
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finally (nxml-debug-change "nxml-clear-inside" ,start ,end))))
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(defun nxml-make-namespace (str)
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"Return a symbol for the namespace URI STR.
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STR must be a string. If STR is the empty string, return nil.
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Otherwise, return the symbol whose name is STR prefixed with a colon."
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(if (string-equal str "")
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nil
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(intern (concat ":" str))))
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(defun nxml-namespace-name (ns)
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"Return the namespace URI corresponding to the symbol NS.
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This is the inverse of `nxml-make-namespace'."
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(and ns (substring (symbol-name ns) 1)))
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(defconst nxml-xml-namespace-uri
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(nxml-make-namespace "http://www.w3.org/XML/1998/namespace"))
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(defconst nxml-xmlns-namespace-uri
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(nxml-make-namespace "http://www.w3.org/2000/xmlns/"))
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(defmacro nxml-with-degradation-on-error (context &rest body)
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(if (not nxml-debug)
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(let ((error-symbol (make-symbol "err")))
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`(condition-case ,error-symbol
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(progn ,@body)
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(error
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(nxml-degrade ,context ,error-symbol))))
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`(progn ,@body)))
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(defmacro nxml-with-unmodifying-text-property-changes (&rest body)
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"Evaluate BODY without any text property changes modifying the buffer.
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Any text properties changes happen as usual but the changes are not treated as
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modifications to the buffer."
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(let ((modified (make-symbol "modified")))
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`(let ((,modified (buffer-modified-p))
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(inhibit-read-only t)
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(inhibit-modification-hooks t)
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(buffer-undo-list t)
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(deactivate-mark nil)
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;; Apparently these avoid file locking problems.
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(buffer-file-name nil)
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(buffer-file-truename nil))
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(unwind-protect
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(progn ,@body)
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(unless ,modified
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(restore-buffer-modified-p nil))))))
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(put 'nxml-with-unmodifying-text-property-changes 'lisp-indent-function 0)
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(def-edebug-spec nxml-with-unmodifying-text-property-changes t)
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(defmacro nxml-with-invisible-motion (&rest body)
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"Evaluate body without calling any point motion hooks."
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`(let ((inhibit-point-motion-hooks t))
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,@body))
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(put 'nxml-with-invisible-motion 'lisp-indent-function 0)
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(def-edebug-spec nxml-with-invisible-motion t)
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(defun nxml-display-file-parse-error (err)
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(let* ((filename (nth 1 err))
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(buffer (find-file-noselect filename))
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(pos (nth 2 err))
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(message (nth 3 err)))
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(pop-to-buffer buffer)
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;; What's the right thing to do if the buffer's modified?
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;; The position in the saved file could be completely different.
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(goto-char (if (buffer-modified-p) 1 pos))
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(error "%s" message)))
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(defun nxml-signal-file-parse-error (file pos message &optional error-symbol)
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(signal (or error-symbol 'nxml-file-parse-error)
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(list file pos message)))
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(put 'nxml-file-parse-error
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'error-conditions
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'(error nxml-file-parse-error))
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(put 'nxml-parse-file-error
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'error-message
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"Error parsing file")
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(provide 'nxml-util)
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;;; nxml-util.el ends here
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