Initial import of the CDE 2.1.30 sources from the Open Group.
This commit is contained in:
Peter Howkins
265
cde/programs/dtdocbook/sgmls/sgml-mode.el
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265
cde/programs/dtdocbook/sgmls/sgml-mode.el
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;;; sgml-mode.el --- mode for editing SGML (ISO 8879)
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;; Copyright (C) 1992 Free Software Foundation, Inc.
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;; Author: James Clark <jjc@jclark.com>
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;; Version: 1.0
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;; This file is not yet 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 1, or (at your option)
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;; 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; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; Some suggestions for your .emacs file:
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;;
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;; (autoload 'sgml-mode "sgml-mode" "SGML mode" t)
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;;
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;; (setq auto-mode-alist
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;; (append (list (cons "\\.sgm$" 'sgml-mode)
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;; (cons "\\.sgml$" 'sgml-mode)
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;; (cons "\\.dtd$" 'sgml-mode))
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;; auto-mode-alist))
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;;; Code:
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(provide 'sgml-mode)
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(require 'compile)
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;;; sgmls is a free SGML parser available from
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;;; ftp.uu.net:pub/text-processing/sgml
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;;; Its error messages can be parsed by next-error.
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;;; The -s option suppresses output.
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(defconst sgml-validate-command
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"sgmls -s"
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"*The command to validate an SGML document.
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The file name of current buffer file name will be appended to this,
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separated by a space.")
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(defvar sgml-saved-validate-command nil
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"The command last used to validate in this buffer.")
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(defvar sgml-mode-map nil "Keymap for SGML mode")
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(if sgml-mode-map
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()
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(setq sgml-mode-map (make-sparse-keymap))
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(define-key sgml-mode-map ">" 'sgml-close-angle)
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(define-key sgml-mode-map "/" 'sgml-slash)
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(define-key sgml-mode-map "\C-c\C-v" 'sgml-validate))
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(defun sgml-mode ()
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"Major mode for editing SGML.
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Makes > display the matching <. Makes / display matching /.
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Use \\[sgml-validate] to validate your document with an SGML parser."
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(interactive)
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(kill-all-local-variables)
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(setq local-abbrev-table text-mode-abbrev-table)
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(use-local-map sgml-mode-map)
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(setq mode-name "SGML")
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(setq major-mode 'sgml-mode)
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(make-local-variable 'paragraph-start)
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;; A start or end tag by itself on a line separates a paragraph.
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;; This is desirable because SGML discards a newline that appears
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;; immediately after a start tag or immediately before an end tag.
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(setq paragraph-start
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"^[ \t\n]\\|\
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\\(</?\\([A-Za-z]\\([-.A-Za-z0-9= \t\n]\\|\"[^\"]*\"\\|'[^']*'\\)*\\)?>$\\)")
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(make-local-variable 'paragraph-separate)
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(setq paragraph-separate
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"^[ \t\n]*$\\|\
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^</?\\([A-Za-z]\\([-.A-Za-z0-9= \t\n]\\|\"[^\"]*\"\\|'[^']*'\\)*\\)?>$")
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(make-local-variable 'sgml-saved-validate-command)
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(set-syntax-table text-mode-syntax-table)
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(make-local-variable 'comment-start)
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(setq comment-start "<!-- ")
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(make-local-variable 'comment-end)
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(setq comment-end " -->")
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(make-local-variable 'comment-indent-hook)
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(setq comment-indent-hook 'sgml-comment-indent)
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(make-local-variable 'comment-start-skip)
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;; This will allow existing comments within declarations to be
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;; recognized.
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(setq comment-start-skip "--[ \t]*")
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(run-hooks 'text-mode-hook 'sgml-mode-hook))
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(defun sgml-comment-indent ()
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(if (and (looking-at "--")
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(not (and (eq (char-after (1- (point))) ?!)
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(eq (char-after (- (point) 2)) ?<))))
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(progn
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(skip-chars-backward " \t")
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(max comment-column (1+ (current-column))))
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0))
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(defconst sgml-start-tag-regex
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"<[A-Za-z]\\([-.A-Za-z0-9= \n\t]\\|\"[^\"]*\"\\|'[^']*'\\)*"
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"Regular expression that matches a non-empty start tag.
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Any terminating > or / is not matched.")
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(defvar sgml-mode-markup-syntax-table nil
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"Syntax table used for scanning SGML markup.")
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(if sgml-mode-markup-syntax-table
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()
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(setq sgml-mode-markup-syntax-table (make-syntax-table))
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(modify-syntax-entry ?< "(>" sgml-mode-markup-syntax-table)
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(modify-syntax-entry ?> ")<" sgml-mode-markup-syntax-table)
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(modify-syntax-entry ?- "_ 1234" sgml-mode-markup-syntax-table)
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(modify-syntax-entry ?\' "\"" sgml-mode-markup-syntax-table))
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(defconst sgml-angle-distance 4000
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"*If non-nil, is the maximum distance to search for matching <
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when > is inserted.")
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(defun sgml-close-angle (arg)
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"Insert > and display matching <."
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(interactive "p")
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(insert-char ?> arg)
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(if (> arg 0)
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(let ((oldpos (point))
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(blinkpos))
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(save-excursion
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(save-restriction
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(if sgml-angle-distance
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(narrow-to-region (max (point-min)
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(- (point) sgml-angle-distance))
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oldpos))
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;; See if it's the end of a marked section.
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(and (> (- (point) (point-min)) 3)
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(eq (char-after (- (point) 2)) ?\])
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(eq (char-after (- (point) 3)) ?\])
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(re-search-backward "<!\\[\\(-?[A-Za-z0-9. \t\n&;]\\|\
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--\\([^-]\\|-[^-]\\)*--\\)*\\["
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(point-min)
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t)
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(let ((msspos (point)))
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(if (and (search-forward "]]>" oldpos t)
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(eq (point) oldpos))
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(setq blinkpos msspos))))
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;; This handles cases where the > ends one of the following:
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;; markup declaration starting with <! (possibly including a
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;; declaration subset); start tag; end tag; SGML declaration.
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(if blinkpos
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()
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(goto-char oldpos)
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(condition-case ()
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(let ((oldtable (syntax-table))
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(parse-sexp-ignore-comments t))
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(unwind-protect
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(progn
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(set-syntax-table sgml-mode-markup-syntax-table)
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(setq blinkpos (scan-sexps oldpos -1)))
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(set-syntax-table oldtable)))
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(error nil))
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(and blinkpos
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(goto-char blinkpos)
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(or
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;; Check that it's a valid delimiter in context.
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(not (looking-at
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"<\\(\\?\\|/?[A-Za-z>]\\|!\\([[A-Za-z]\\|--\\)\\)"))
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;; Check that it's not a net-enabling start tag
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;; nor an unclosed start-tag.
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(looking-at (concat sgml-start-tag-regex "[/<]"))
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;; Nor an unclosed end-tag.
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(looking-at "</[A-Za-z][-.A-Za-z0-9]*[ \t]*<"))
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(setq blinkpos nil)))
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(if blinkpos
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()
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;; See if it's the end of a processing instruction.
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(goto-char oldpos)
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(if (search-backward "<?" (point-min) t)
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(let ((pipos (point)))
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(if (and (search-forward ">" oldpos t)
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(eq (point) oldpos))
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(setq blinkpos pipos))))))
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(if blinkpos
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(progn
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(goto-char blinkpos)
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(if (pos-visible-in-window-p)
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(sit-for 1)
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(message "Matches %s"
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(buffer-substring blinkpos
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(progn (end-of-line)
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(point)))))))))))
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;;; I doubt that null end tags are used much for large elements,
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;;; so use a small distance here.
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(defconst sgml-slash-distance 1000
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"*If non-nil, is the maximum distance to search for matching /
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when / is inserted.")
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(defun sgml-slash (arg)
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"Insert / and display any previous matching /.
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Two /s are treated as matching if the first / ends a net-enabling
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start tag, and the second / is the corresponding null end tag."
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(interactive "p")
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(insert-char ?/ arg)
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(if (> arg 0)
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(let ((oldpos (point))
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(blinkpos)
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(level 0))
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(save-excursion
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(save-restriction
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(if sgml-slash-distance
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(narrow-to-region (max (point-min)
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(- (point) sgml-slash-distance))
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oldpos))
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(if (and (re-search-backward sgml-start-tag-regex (point-min) t)
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(eq (match-end 0) (1- oldpos)))
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()
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(goto-char (1- oldpos))
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(while (and (not blinkpos)
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(search-backward "/" (point-min) t))
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(let ((tagend (save-excursion
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(if (re-search-backward sgml-start-tag-regex
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(point-min) t)
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(match-end 0)
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nil))))
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(if (eq tagend (point))
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(if (eq level 0)
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(setq blinkpos (point))
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(setq level (1- level)))
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(setq level (1+ level)))))))
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(if blinkpos
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(progn
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(goto-char blinkpos)
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(if (pos-visible-in-window-p)
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(sit-for 1)
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(message "Matches %s"
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(buffer-substring (progn
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(beginning-of-line)
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(point))
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(1+ blinkpos))))))))))
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(defun sgml-validate (command)
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"Validate an SGML document.
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Runs COMMAND, a shell command, in a separate process asynchronously
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with output going to the buffer *compilation*.
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You can then use the command \\[next-error] to find the next error message
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and move to the line in the SGML document that caused it."
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(interactive
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(list (read-string "Validate command: "
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(or sgml-saved-validate-command
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(concat sgml-validate-command
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" "
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(let ((name (buffer-file-name)))
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(and name
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(file-name-nondirectory name))))))))
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(setq sgml-saved-validate-command command)
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(compile1 command "No more errors"))
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;;; sgml-mode.el ends here
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