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- ;;; psgml-api.el --- Extra API functions for PSGML
- ;; $Id: psgml-api.el,v 1.4 1996/03/19 21:00:19 lenst Exp $
-
- ;; Copyright (C) 1994 Lennart Staflin
-
- ;; Author: Lennart Staflin <lenst@lysator.liu.se>
-
- ;; This program 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 2
- ;; of the License, or (at your option) any later version.
- ;;
- ;; This program 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 this program; if not, write to the Free Software
- ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
- ;;; Commentary:
-
- ;; Provides some extra functions for the API to PSGML.
-
-
- ;;; Code:
-
- (provide 'psgml-api)
- (require 'psgml)
- (require 'psgml-parse)
-
-
- ;;;; Mapping: map and modify
-
- (defun sgml-map-element-modify (el-fun element)
- "Apply EL-FUN to ELEMENT and the elements in its content.
- The EL-FUN may change the buffer. But if it changes the buffer and
- leaves the element with no start-tag some elements may be ignored."
- (let ((level ; level in the element tree
- 0)
- next
- (tick ; change counter
- (buffer-modified-tick)))
- (while element
- (funcall el-fun element)
- ;; If the function has modified the buffer, a fresh parse is needed
- (when (/= tick (buffer-modified-tick))
- (setq element (sgml-find-element-of (sgml-element-start element)))
- (setq tick (buffer-modified-tick)))
- (cond
- ;; Map content if any
- ((setq next (sgml-element-content element))
- (incf level))
- ;; If in a sub-tree, move to next element
- (t
- (while (and (> level 0)
- (null (setq next (sgml-element-next element))))
- (setq element (sgml-element-parent element))
- (decf level))))
- (setq element next))))
-
- ;;;; Map content
-
- (defun sgml-map-content (element element-fun
- &optional data-fun pi-fun entity-fun)
- "Map content of ELEMENT, calling ELEMENT-FUN for every element.
- Also calling DATA-FUN, if non-nil, with data in content."
- (sgml-pop-all-entities)
- (sgml-need-dtd)
- (sgml-element-end element) ; Make sure all content is parsed
- (let ((main-buffer-max (point-max)))
- (save-excursion
- (sgml-set-parse-state element 'start)
- (when (eobp) (sgml-pop-entity))
- (when (eolp) (forward-char 1))
- (sgml-parse-data main-buffer-max data-fun pi-fun entity-fun)
- (let ((c (sgml-tree-content element)))
- (while c
- (sgml-pop-all-entities)
- (funcall element-fun c)
- (sgml-set-parse-state c 'after)
- (sgml-parse-data main-buffer-max data-fun pi-fun entity-fun)
- (setq c (sgml-tree-next c)))))
- )
- (sgml-pop-all-entities))
-
- (defun sgml-parse-data (sgml-goal sgml-data-function sgml-pi-function
- sgml-entity-function)
- (let ((sgml-throw-on-element-change 'el-done))
- (catch sgml-throw-on-element-change
- (sgml-with-parser-syntax
- (sgml-parser-loop nil)))))
-
- ;;;; Entity management
-
- (defun sgml-push-to-string (string)
- "Create an entity from STRING and push it on the top of the entity stack.
- After this the current buffer will be a scratch buffer containing the text
- of the new entity with point at the first character.
- Use `sgml-pop-entity' to exit from this buffer."
- (sgml-push-to-entity (sgml-make-entity "#STRING" 'text string)))
-
-
-
- ;;; psgml-api.el ends here
-