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595 lines
19 KiB
EmacsLisp
595 lines
19 KiB
EmacsLisp
;;; xml.el --- XML parser
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;; Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
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;; Author: Emmanuel Briot <briot@gnat.com>
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;; Maintainer: FSF
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;; Keywords: xml, data
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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 2, 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 the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This file contains a somewhat incomplete non-validating XML parser. It
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;; parses a file, and returns a list that can be used internally by
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;; any other lisp libraries.
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;;; FILE FORMAT
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;; The document type declaration may either be ignored or (optionally)
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;; parsed, but currently the parsing will only accept element
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;; declarations. The XML file is assumed to be well-formed. In case
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;; of error, the parsing stops and the XML file is shown where the
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;; parsing stopped.
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;;
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;; It also knows how to ignore comments and processing instructions.
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;;
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;; The XML file should have the following format:
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;; <node1 attr1="name1" attr2="name2" ...>value
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;; <node2 attr3="name3" attr4="name4">value2</node2>
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;; <node3 attr5="name5" attr6="name6">value3</node3>
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;; </node1>
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;; Of course, the name of the nodes and attributes can be anything. There can
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;; be any number of attributes (or none), as well as any number of children
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;; below the nodes.
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;;
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;; There can be only top level node, but with any number of children below.
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;;; LIST FORMAT
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;; The functions `xml-parse-file' and `xml-parse-tag' return a list with
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;; the following format:
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;;
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;; xml-list ::= (node node ...)
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;; node ::= (tag_name attribute-list . child_node_list)
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;; child_node_list ::= child_node child_node ...
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;; child_node ::= node | string
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;; tag_name ::= string
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;; attribute_list ::= (("attribute" . "value") ("attribute" . "value") ...)
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;; | nil
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;; string ::= "..."
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;;
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;; Some macros are provided to ease the parsing of this list.
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;; Whitespace is preserved. Fixme: There should be a tree-walker that
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;; can remove it.
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;;; Code:
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;; Note that {buffer-substring,match-string}-no-properties were
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;; formerly used in several places, but that removes composition info.
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;;*******************************************************************
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;;**
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;;** Macros to parse the list
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;;**
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;;*******************************************************************
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(defsubst xml-node-name (node)
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"Return the tag associated with NODE.
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The tag is a lower-case symbol."
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(car node))
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(defsubst xml-node-attributes (node)
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"Return the list of attributes of NODE.
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The list can be nil."
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(nth 1 node))
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(defsubst xml-node-children (node)
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"Return the list of children of NODE.
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This is a list of nodes, and it can be nil."
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(cddr node))
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(defun xml-get-children (node child-name)
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"Return the children of NODE whose tag is CHILD-NAME.
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CHILD-NAME should be a lower case symbol."
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(let ((match ()))
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(dolist (child (xml-node-children node))
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(if child
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(if (equal (xml-node-name child) child-name)
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(push child match))))
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(nreverse match)))
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(defun xml-get-attribute (node attribute)
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"Get from NODE the value of ATTRIBUTE.
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An empty string is returned if the attribute was not found."
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(if (xml-node-attributes node)
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(let ((value (assoc attribute (xml-node-attributes node))))
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(if value
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(cdr value)
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""))
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""))
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;;*******************************************************************
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;;**
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;;** Creating the list
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;;**
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;;*******************************************************************
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;;;###autoload
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(defun xml-parse-file (file &optional parse-dtd)
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"Parse the well-formed XML file FILE.
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If FILE is already visited, use its buffer and don't kill it.
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Returns the top node with all its children.
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If PARSE-DTD is non-nil, the DTD is parsed rather than skipped."
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(let ((keep))
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(if (get-file-buffer file)
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(progn
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(set-buffer (get-file-buffer file))
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(setq keep (point)))
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(let (auto-mode-alist) ; no need for xml-mode
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(find-file file)))
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(let ((xml (xml-parse-region (point-min)
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(point-max)
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(current-buffer)
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parse-dtd)))
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(if keep
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(goto-char keep)
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(kill-buffer (current-buffer)))
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xml)))
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;; Note that this is setup so that we can do whitespace-skipping with
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;; `(skip-syntax-forward " ")', inter alia. Previously this was slow
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;; compared with `re-search-forward', but that has been fixed. Also
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;; note that the standard syntax table contains other characters with
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;; whitespace syntax, like NBSP, but they are invalid in contexts in
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;; which we might skip whitespace -- specifically, they're not
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;; NameChars [XML 4].
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(defvar xml-syntax-table
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(let ((table (make-syntax-table)))
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;; Get space syntax correct per XML [3].
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(dotimes (c 31)
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(modify-syntax-entry c "." table)) ; all are space in standard table
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(dolist (c '(?\t ?\n ?\r)) ; these should be space
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(modify-syntax-entry c " " table))
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;; For skipping attributes.
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(modify-syntax-entry ?\" "\"" table)
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(modify-syntax-entry ?' "\"" table)
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;; Non-alnum name chars should be symbol constituents (`-' and `_'
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;; are OK by default).
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(modify-syntax-entry ?. "_" table)
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(modify-syntax-entry ?: "_" table)
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;; XML [89]
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(dolist (c '(#x00B7 #x02D0 #x02D1 #x0387 #x0640 #x0E46 #x0EC6 #x3005
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#x3031 #x3032 #x3033 #x3034 #x3035 #x309D #x309E #x30FC
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#x30FD #x30FE))
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(modify-syntax-entry (decode-char 'ucs c) "w" table))
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;; Fixme: rest of [4]
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table)
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"Syntax table used by `xml-parse-region'.")
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;; XML [5]
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;; Note that [:alpha:] matches all multibyte chars with word syntax.
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(eval-and-compile
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(defconst xml-name-regexp "[[:alpha:]_:][[:alnum:]._:-]*"))
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;; Fixme: This needs re-writing to deal with the XML grammar properly, i.e.
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;; document ::= prolog element Misc*
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;; prolog ::= XMLDecl? Misc* (doctypedecl Misc*)?
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;;;###autoload
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(defun xml-parse-region (beg end &optional buffer parse-dtd)
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"Parse the region from BEG to END in BUFFER.
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If BUFFER is nil, it defaults to the current buffer.
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Returns the XML list for the region, or raises an error if the region
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is not a well-formed XML file.
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If PARSE-DTD is non-nil, the DTD is parsed rather than skipped,
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and returned as the first element of the list."
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(save-restriction
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(narrow-to-region beg end)
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;; Use fixed syntax table to ensure regexp char classes and syntax
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;; specs DTRT.
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(with-syntax-table (standard-syntax-table)
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(let ((case-fold-search nil) ; XML is case-sensitive.
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xml result dtd)
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(save-excursion
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(if buffer
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(set-buffer buffer))
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(goto-char (point-min))
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(while (not (eobp))
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(if (search-forward "<" nil t)
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(progn
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(forward-char -1)
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(if xml
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;; translation of rule [1] of XML specifications
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(error "XML files can have only one toplevel tag")
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(setq result (xml-parse-tag parse-dtd))
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(cond
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((null result))
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((listp (car result))
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(setq dtd (car result))
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(if (cdr result) ; possible leading comment
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(add-to-list 'xml (cdr result))))
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(t
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(add-to-list 'xml result)))))
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(goto-char (point-max))))
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(if parse-dtd
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(cons dtd (nreverse xml))
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(nreverse xml)))))))
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(defun xml-parse-tag (&optional parse-dtd)
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"Parse the tag at point.
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If PARSE-DTD is non-nil, the DTD of the document, if any, is parsed and
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returned as the first element in the list.
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Returns one of:
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- a list : the matching node
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- nil : the point is not looking at a tag.
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- a pair : the first element is the DTD, the second is the node."
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(cond
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;; Processing instructions (like the <?xml version="1.0"?> tag at the
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;; beginning of a document).
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((looking-at "<\\?")
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(search-forward "?>")
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(skip-syntax-forward " ")
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(xml-parse-tag parse-dtd))
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;; Character data (CDATA) sections, in which no tag should be interpreted
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((looking-at "<!\\[CDATA\\[")
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(let ((pos (match-end 0)))
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(unless (search-forward "]]>" nil t)
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(error "CDATA section does not end anywhere in the document"))
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(buffer-substring pos (match-beginning 0))))
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;; DTD for the document
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((looking-at "<!DOCTYPE")
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(let (dtd)
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(if parse-dtd
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(setq dtd (xml-parse-dtd))
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(xml-skip-dtd))
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(skip-syntax-forward " ")
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(if dtd
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(cons dtd (xml-parse-tag))
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(xml-parse-tag))))
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;; skip comments
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((looking-at "<!--")
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(search-forward "-->")
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nil)
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;; end tag
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((looking-at "</")
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'())
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;; opening tag
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((looking-at "<\\([^/>[:space:]]+\\)")
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(goto-char (match-end 1))
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(let* ((node-name (match-string 1))
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;; Parse the attribute list.
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(children (list (xml-parse-attlist) (intern node-name)))
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pos)
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;; is this an empty element ?
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(if (looking-at "/>")
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(progn
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(forward-char 2)
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(nreverse children))
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;; is this a valid start tag ?
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(if (eq (char-after) ?>)
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(progn
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(forward-char 1)
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;; Now check that we have the right end-tag. Note that this
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;; one might contain spaces after the tag name
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(let ((end (concat "</" node-name "\\s-*>")))
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(while (not (looking-at end))
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(cond
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((looking-at "</")
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(error "XML: Invalid end tag (expecting %s) at pos %d"
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node-name (point)))
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((= (char-after) ?<)
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(let ((tag (xml-parse-tag)))
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(when tag
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(push tag children))))
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(t
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(setq pos (point))
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(search-forward "<")
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(forward-char -1)
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(let ((string (buffer-substring pos (point)))
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(pos 0))
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;; Clean up the string. As per XML
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;; specifications, the XML processor should
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;; always pass the whole string to the
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;; application. But \r's should be replaced:
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;; http://www.w3.org/TR/2000/REC-xml-20001006#sec-line-ends
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(while (string-match "\r\n?" string pos)
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(setq string (replace-match "\n" t t string))
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(setq pos (1+ (match-beginning 0))))
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(setq string (xml-substitute-special string))
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(setq children
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(if (stringp (car children))
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;; The two strings were separated by a comment.
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(cons (concat (car children) string)
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(cdr children))
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(cons string children))))))))
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(goto-char (match-end 0))
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(nreverse children))
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;; This was an invalid start tag
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(error "XML: Invalid attribute list")))))
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(t ;; This is not a tag.
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(error "XML: Invalid character"))))
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(defun xml-parse-attlist ()
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"Return the attribute-list after point.
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Leave point at the first non-blank character after the tag."
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(let ((attlist ())
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start-pos name)
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(skip-syntax-forward " ")
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(while (looking-at (eval-when-compile
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(concat "\\(" xml-name-regexp "\\)\\s-*=\\s-*")))
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(setq name (intern (match-string 1)))
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(goto-char (match-end 0))
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;; See also: http://www.w3.org/TR/2000/REC-xml-20001006#AVNormalize
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;; Do we have a string between quotes (or double-quotes),
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;; or a simple word ?
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(if (looking-at "\"\\([^\"]*\\)\"")
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(setq start-pos (match-beginning 0))
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(if (looking-at "'\\([^']*\\)'")
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(setq start-pos (match-beginning 0))
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(error "XML: Attribute values must be given between quotes")))
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;; Each attribute must be unique within a given element
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(if (assoc name attlist)
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(error "XML: each attribute must be unique within an element"))
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;; Multiple whitespace characters should be replaced with a single one
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;; in the attributes
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(let ((string (match-string 1))
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(pos 0))
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(replace-regexp-in-string "\\s-\\{2,\\}" " " string)
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(push (cons name (xml-substitute-special string)) attlist))
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(goto-char start-pos)
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(forward-sexp) ; we have string syntax
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(skip-syntax-forward " "))
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(nreverse attlist)))
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;;*******************************************************************
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;;**
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;;** The DTD (document type declaration)
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;;** The following functions know how to skip or parse the DTD of
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;;** a document
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;;**
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;;*******************************************************************
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;; Fixme: This fails at least if the DTD contains conditional sections.
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(defun xml-skip-dtd ()
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"Skip the DTD at point.
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This follows the rule [28] in the XML specifications."
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(forward-char (length "<!DOCTYPE"))
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(if (looking-at "\\s-*>")
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(error "XML: invalid DTD (excepting name of the document)"))
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(condition-case nil
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(progn
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(forward-sexp)
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(skip-syntax-forward " ")
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(if (looking-at "\\[")
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(re-search-forward "]\\s-*>")
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(search-forward ">")))
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(error (error "XML: No end to the DTD"))))
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(defun xml-parse-dtd ()
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"Parse the DTD at point."
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(forward-char (eval-when-compile (length "<!DOCTYPE")))
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(skip-syntax-forward " ")
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(if (looking-at ">")
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(error "XML: invalid DTD (excepting name of the document)"))
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;; Get the name of the document
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(looking-at xml-name-regexp)
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(let ((dtd (list (match-string 0) 'dtd))
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type element end-pos)
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(goto-char (match-end 0))
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(skip-syntax-forward " ")
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;; XML [75]
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(cond ((looking-at "PUBLIC\\s-+")
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(goto-char (match-end 0))
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(unless (or (re-search-forward
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"\\=\"\\([[:space:][:alnum:]-'()+,./:=?;!*#@$_%]*\\)\""
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nil t)
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(re-search-forward
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"\\='\\([[:space:][:alnum:]-()+,./:=?;!*#@$_%]*\\)'"
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nil t))
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(error "XML: missing public id"))
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(let ((pubid (match-string 1)))
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(unless (or (re-search-forward "\\='\\([^']*\\)'" nil t)
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(re-search-forward "\\=\"\\([^\"]*\\)\"" nil t))
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(error "XML: missing system id"))
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(push (list pubid (match-string 1) 'public) dtd)))
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((looking-at "SYSTEM\\s-+")
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(goto-char (match-end 0))
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(unless (or (re-search-forward "\\='\\([^']*\\)'" nil t)
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(re-search-forward "\\=\"\\([^\"]*\\)\"" nil t))
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(error "XML: missing system id"))
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(push (list (match-string 1) 'system) dtd)))
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(skip-syntax-forward " ")
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(if (eq ?> (char-after))
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(forward-char)
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(skip-syntax-forward " ")
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(if (not (eq (char-after) ?\[))
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(error "XML: bad DTD")
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(forward-char)
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;; Parse the rest of the DTD
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;; Fixme: Deal with ENTITY, ATTLIST, NOTATION, PIs.
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(while (not (looking-at "\\s-*\\]"))
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(skip-syntax-forward " ")
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(cond
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;; Translation of rule [45] of XML specifications
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((looking-at
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"<!ELEMENT\\s-+\\([[:alnum:].%;]+\\)\\s-+\\([^>]+\\)>")
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(setq element (intern (match-string 1))
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type (match-string-no-properties 2))
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(setq end-pos (match-end 0))
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;; Translation of rule [46] of XML specifications
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(cond
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((string-match "^EMPTY[ \t\n\r]*$" type) ;; empty declaration
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(setq type 'empty))
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((string-match "^ANY[ \t\n\r]*$" type) ;; any type of contents
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(setq type 'any))
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((string-match "^(\\(.*\\))[ \t\n\r]*$" type) ;; children ([47])
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(setq type (xml-parse-elem-type (match-string 1 type))))
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((string-match "^%[^;]+;[ \t\n\r]*$" type) ;; substitution
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nil)
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(t
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(error "XML: Invalid element type in the DTD")))
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;; rule [45]: the element declaration must be unique
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(if (assoc element dtd)
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(error "XML: element declarations must be unique in a DTD (<%s>)"
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(symbol-name element)))
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;; Store the element in the DTD
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(push (list element type) dtd)
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(goto-char end-pos))
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((looking-at "<!--")
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(search-forward "-->"))
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(t
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(error "XML: Invalid DTD item")))
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;; Skip the end of the DTD
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(search-forward ">"))))
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(nreverse dtd)))
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(defun xml-parse-elem-type (string)
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"Convert element type STRING into a Lisp structure."
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(let (elem modifier)
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(if (string-match "(\\([^)]+\\))\\([+*?]?\\)" string)
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(progn
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(setq elem (match-string 1 string)
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modifier (match-string 2 string))
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(if (string-match "|" elem)
|
|
(setq elem (cons 'choice
|
|
(mapcar 'xml-parse-elem-type
|
|
(split-string elem "|"))))
|
|
(if (string-match "," elem)
|
|
(setq elem (cons 'seq
|
|
(mapcar 'xml-parse-elem-type
|
|
(split-string elem ",")))))))
|
|
(if (string-match "[ \t\n\r]*\\([^+*?]+\\)\\([+*?]?\\)" string)
|
|
(setq elem (match-string 1 string)
|
|
modifier (match-string 2 string))))
|
|
|
|
(if (and (stringp elem) (string= elem "#PCDATA"))
|
|
(setq elem 'pcdata))
|
|
|
|
(cond
|
|
((string= modifier "+")
|
|
(list '+ elem))
|
|
((string= modifier "*")
|
|
(list '* elem))
|
|
((string= modifier "?")
|
|
(list '\? elem))
|
|
(t
|
|
elem))))
|
|
|
|
;;*******************************************************************
|
|
;;**
|
|
;;** Substituting special XML sequences
|
|
;;**
|
|
;;*******************************************************************
|
|
|
|
(eval-when-compile
|
|
(defvar str)) ; dynamic from replace-regexp-in-string
|
|
|
|
;; Fixme: Take declared entities from the DTD when they're available.
|
|
(defun xml-substitute-entity (match)
|
|
"Subroutine of xml-substitute-special."
|
|
(save-match-data
|
|
(let ((match1 (match-string 1 str)))
|
|
(cond ((string= match1 "lt") "<")
|
|
((string= match1 "gt") ">")
|
|
((string= match1 "apos") "'")
|
|
((string= match1 "quot") "\"")
|
|
((string= match1 "amp") "&")
|
|
((and (string-match "#\\([0-9]+\\)" match1)
|
|
(let ((c (decode-char
|
|
'ucs
|
|
(string-to-number (match-string 1 match1)))))
|
|
(if c (string c))))) ; else unrepresentable
|
|
((and (string-match "#x\\([[:xdigit:]]+\\)" match1)
|
|
(let ((c (decode-char
|
|
'ucs
|
|
(string-to-number (match-string 1 match1) 16))))
|
|
(if c (string c)))))
|
|
;; Default to asis. Arguably, unrepresentable code points
|
|
;; might be best replaced with U+FFFD.
|
|
(t match)))))
|
|
|
|
(defun xml-substitute-special (string)
|
|
"Return STRING, after subsituting entity references."
|
|
;; This originally made repeated passes through the string from the
|
|
;; beginning, which isn't correct, since then either "&amp;" or
|
|
;; "&amp;" won't DTRT.
|
|
(replace-regexp-in-string "&\\([^;]+\\);"
|
|
#'xml-substitute-entity string t t))
|
|
|
|
;;*******************************************************************
|
|
;;**
|
|
;;** Printing a tree.
|
|
;;** This function is intended mainly for debugging purposes.
|
|
;;**
|
|
;;*******************************************************************
|
|
|
|
(defun xml-debug-print (xml)
|
|
(dolist (node xml)
|
|
(xml-debug-print-internal node "")))
|
|
|
|
(defun xml-debug-print-internal (xml indent-string)
|
|
"Outputs the XML tree in the current buffer.
|
|
The first line is indented with INDENT-STRING."
|
|
(let ((tree xml)
|
|
attlist)
|
|
(insert indent-string ?< (symbol-name (xml-node-name tree)))
|
|
|
|
;; output the attribute list
|
|
(setq attlist (xml-node-attributes tree))
|
|
(while attlist
|
|
(insert ?\ (symbol-name (caar attlist)) "=\"" (cdar attlist) ?\")
|
|
(setq attlist (cdr attlist)))
|
|
|
|
(insert ?>)
|
|
|
|
(setq tree (xml-node-children tree))
|
|
|
|
;; output the children
|
|
(dolist (node tree)
|
|
(cond
|
|
((listp node)
|
|
(insert ?\n)
|
|
(xml-debug-print-internal node (concat indent-string " ")))
|
|
((stringp node) (insert node))
|
|
(t
|
|
(error "Invalid XML tree"))))
|
|
|
|
(insert ?\n indent-string
|
|
?< ?/ (symbol-name (xml-node-name xml)) ?>)))
|
|
|
|
(provide 'xml)
|
|
|
|
;;; xml.el ends here
|