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- ;;; sgml-mode.el --- SGML-editing mode
-
- ;; Copyright (C) 1992 Free Software Foundation, Inc.
-
- ;; Author: James Clark <jjc@clark.com>
- ;; Adapted-By: ESR
- ;; Keywords: wp
-
- ;; 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 1, 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; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Commentary:
-
- ;; Major mode for editing the SGML document-markup language.
-
- ;;; Code:
-
- (provide 'sgml-mode)
- (require 'compile)
-
- ;;; sgmls is a free SGML parser available from
- ;;; ftp.uu.net:pub/text-processing/sgml
- ;;; Its error messages can be parsed by next-error.
- ;;; The -s option suppresses output.
-
- (defconst sgml-validate-command
- "sgmls -s"
- "*The command to validate an SGML document.
- The file name of current buffer file name will be appended to this,
- separated by a space.")
-
- (defvar sgml-saved-validate-command nil
- "The command last used to validate in this buffer.")
-
- (defvar sgml-mode-map nil "Keymap for SGML mode")
-
- (if sgml-mode-map
- ()
- (setq sgml-mode-map (make-sparse-keymap))
- (define-key sgml-mode-map ">" 'sgml-close-angle)
- (define-key sgml-mode-map "/" 'sgml-slash)
- (define-key sgml-mode-map "\C-c\C-v" 'sgml-validate))
-
- ;;;###autoload
- (defun sgml-mode ()
- "Major mode for editing SGML.
- Makes > display the matching <. Makes / display matching /.
- Use \\[sgml-validate] to validate your document with an SGML parser."
- (interactive)
- (kill-all-local-variables)
- (setq local-abbrev-table text-mode-abbrev-table)
- (use-local-map sgml-mode-map)
- (setq mode-name "SGML")
- (setq major-mode 'sgml-mode)
- (make-local-variable 'paragraph-start)
- ;; A start or end tag by itself on a line separates a paragraph.
- ;; This is desirable because SGML discards a newline that appears
- ;; immediately after a start tag or immediately before an end tag.
- (setq paragraph-start
- "^[ \t\n]\\|\
- \\(</?\\([A-Za-z]\\([-.A-Za-z0-9= \t\n]\\|\"[^\"]*\"\\|'[^']*'\\)*\\)?>$\\)")
- (make-local-variable 'paragraph-separate)
- (setq paragraph-separate
- "^[ \t\n]*$\\|\
- ^</?\\([A-Za-z]\\([-.A-Za-z0-9= \t\n]\\|\"[^\"]*\"\\|'[^']*'\\)*\\)?>$")
- (make-local-variable 'sgml-saved-validate-command)
- (set-syntax-table text-mode-syntax-table)
- (make-local-variable 'comment-start)
- (setq comment-start "<!-- ")
- (make-local-variable 'comment-end)
- (setq comment-end " -->")
- (make-local-variable 'comment-indent-function)
- (setq comment-indent-function 'sgml-comment-indent)
- (make-local-variable 'comment-start-skip)
- ;; This will allow existing comments within declarations to be
- ;; recognized.
- (setq comment-start-skip "--[ \t]*")
- (run-hooks 'text-mode-hook 'sgml-mode-hook))
-
- (defun sgml-comment-indent ()
- (if (and (looking-at "--")
- (not (and (eq (char-after (1- (point))) ?!)
- (eq (char-after (- (point) 2)) ?<))))
- (progn
- (skip-chars-backward " \t")
- (max comment-column (1+ (current-column))))
- 0))
-
- (defconst sgml-start-tag-regex
- "<[A-Za-z]\\([-.A-Za-z0-9= \n\t]\\|\"[^\"]*\"\\|'[^']*'\\)*"
- "Regular expression that matches a non-empty start tag.
- Any terminating > or / is not matched.")
-
- (defvar sgml-mode-markup-syntax-table nil
- "Syntax table used for scanning SGML markup.")
-
- (if sgml-mode-markup-syntax-table
- ()
- (setq sgml-mode-markup-syntax-table (make-syntax-table))
- (modify-syntax-entry ?< "(>" sgml-mode-markup-syntax-table)
- (modify-syntax-entry ?> ")<" sgml-mode-markup-syntax-table)
- (modify-syntax-entry ?- "_ 1234" sgml-mode-markup-syntax-table)
- (modify-syntax-entry ?\' "\"" sgml-mode-markup-syntax-table))
-
- (defconst sgml-angle-distance 4000
- "*If non-nil, is the maximum distance to search for matching <.")
-
- (defun sgml-close-angle (arg)
- "Insert > and display matching <."
- (interactive "p")
- (insert-char ?> arg)
- (if (> arg 0)
- (let ((oldpos (point))
- (blinkpos))
- (save-excursion
- (save-restriction
- (if sgml-angle-distance
- (narrow-to-region (max (point-min)
- (- (point) sgml-angle-distance))
- oldpos))
- ;; See if it's the end of a marked section.
- (and (> (- (point) (point-min)) 3)
- (eq (char-after (- (point) 2)) ?\])
- (eq (char-after (- (point) 3)) ?\])
- (re-search-backward "<!\\[\\(-?[A-Za-z0-9. \t\n&;]\\|\
- --\\([^-]\\|-[^-]\\)*--\\)*\\["
- (point-min)
- t)
- (let ((msspos (point)))
- (if (and (search-forward "]]>" oldpos t)
- (eq (point) oldpos))
- (setq blinkpos msspos))))
- ;; This handles cases where the > ends one of the following:
- ;; markup declaration starting with <! (possibly including a
- ;; declaration subset); start tag; end tag; SGML declaration.
- (if blinkpos
- ()
- (goto-char oldpos)
- (condition-case ()
- (let ((oldtable (syntax-table))
- (parse-sexp-ignore-comments t))
- (unwind-protect
- (progn
- (set-syntax-table sgml-mode-markup-syntax-table)
- (setq blinkpos (scan-sexps oldpos -1)))
- (set-syntax-table oldtable)))
- (error nil))
- (and blinkpos
- (goto-char blinkpos)
- (or
- ;; Check that it's a valid delimiter in context.
- (not (looking-at
- "<\\(\\?\\|/?[A-Za-z>]\\|!\\([[A-Za-z]\\|--\\)\\)"))
- ;; Check that it's not a net-enabling start tag
- ;; nor an unclosed start-tag.
- (looking-at (concat sgml-start-tag-regex "[/<]"))
- ;; Nor an unclosed end-tag.
- (looking-at "</[A-Za-z][-.A-Za-z0-9]*[ \t]*<"))
- (setq blinkpos nil)))
- (if blinkpos
- ()
- ;; See if it's the end of a processing instruction.
- (goto-char oldpos)
- (if (search-backward "<?" (point-min) t)
- (let ((pipos (point)))
- (if (and (search-forward ">" oldpos t)
- (eq (point) oldpos))
- (setq blinkpos pipos))))))
- (if blinkpos
- (progn
- (goto-char blinkpos)
- (if (pos-visible-in-window-p)
- (sit-for 1)
- (message "Matches %s"
- (buffer-substring blinkpos
- (progn (end-of-line)
- (point)))))))))))
-
- ;;; I doubt that null end tags are used much for large elements,
- ;;; so use a small distance here.
- (defconst sgml-slash-distance 1000
- "*If non-nil, is the maximum distance to search for matching /.")
-
- (defun sgml-slash (arg)
- "Insert / and display any previous matching /.
- Two /s are treated as matching if the first / ends a net-enabling
- start tag, and the second / is the corresponding null end tag."
- (interactive "p")
- (insert-char ?/ arg)
- (if (> arg 0)
- (let ((oldpos (point))
- (blinkpos)
- (level 0))
- (save-excursion
- (save-restriction
- (if sgml-slash-distance
- (narrow-to-region (max (point-min)
- (- (point) sgml-slash-distance))
- oldpos))
- (if (and (re-search-backward sgml-start-tag-regex (point-min) t)
- (eq (match-end 0) (1- oldpos)))
- ()
- (goto-char (1- oldpos))
- (while (and (not blinkpos)
- (search-backward "/" (point-min) t))
- (let ((tagend (save-excursion
- (if (re-search-backward sgml-start-tag-regex
- (point-min) t)
- (match-end 0)
- nil))))
- (if (eq tagend (point))
- (if (eq level 0)
- (setq blinkpos (point))
- (setq level (1- level)))
- (setq level (1+ level)))))))
- (if blinkpos
- (progn
- (goto-char blinkpos)
- (if (pos-visible-in-window-p)
- (sit-for 1)
- (message "Matches %s"
- (buffer-substring (progn
- (beginning-of-line)
- (point))
- (1+ blinkpos))))))))))
-
- (defun sgml-validate (command)
- "Validate an SGML document.
- Runs COMMAND, a shell command, in a separate process asynchronously
- with output going to the buffer *compilation*.
- You can then use the command \\[next-error] to find the next error message
- and move to the line in the SGML document that caused it."
- (interactive
- (list (read-string "Validate command: "
- (or sgml-saved-validate-command
- (concat sgml-validate-command
- " "
- (let ((name (buffer-file-name)))
- (and name
- (file-name-nondirectory name))))))))
- (setq sgml-saved-validate-command command)
- (compile-internal command "No more errors"))
-
- ;;; sgml-mode.el ends here
-