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1 ;;; xml.el --- XML parser
3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
6 ;; Author: Emmanuel Briot <briot@gnat.com>
7 ;; Maintainer: Mark A. Hershberger <mah@everybody.org>
8 ;; Keywords: xml, data
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
25 ;;; Commentary:
27 ;; This file contains a somewhat incomplete non-validating XML parser. It
28 ;; parses a file, and returns a list that can be used internally by
29 ;; any other Lisp libraries.
31 ;;; FILE FORMAT
33 ;; The document type declaration may either be ignored or (optionally)
34 ;; parsed, but currently the parsing will only accept element
35 ;; declarations. The XML file is assumed to be well-formed. In case
36 ;; of error, the parsing stops and the XML file is shown where the
37 ;; parsing stopped.
39 ;; It also knows how to ignore comments and processing instructions.
41 ;; The XML file should have the following format:
42 ;; <node1 attr1="name1" attr2="name2" ...>value
43 ;; <node2 attr3="name3" attr4="name4">value2</node2>
44 ;; <node3 attr5="name5" attr6="name6">value3</node3>
45 ;; </node1>
46 ;; Of course, the name of the nodes and attributes can be anything. There can
47 ;; be any number of attributes (or none), as well as any number of children
48 ;; below the nodes.
50 ;; There can be only top level node, but with any number of children below.
52 ;;; LIST FORMAT
54 ;; The functions `xml-parse-file', `xml-parse-region' and
55 ;; `xml-parse-tag' return a list with the following format:
57 ;; xml-list ::= (node node ...)
58 ;; node ::= (qname attribute-list . child_node_list)
59 ;; child_node_list ::= child_node child_node ...
60 ;; child_node ::= node | string
61 ;; qname ::= (:namespace-uri . "name") | "name"
62 ;; attribute_list ::= ((qname . "value") (qname . "value") ...)
63 ;; | nil
64 ;; string ::= "..."
66 ;; Some macros are provided to ease the parsing of this list.
67 ;; Whitespace is preserved. Fixme: There should be a tree-walker that
68 ;; can remove it.
70 ;; TODO:
71 ;; * xml:base, xml:space support
72 ;; * more complete DOCTYPE parsing
73 ;; * pi support
75 ;;; Code:
77 ;; Note that buffer-substring and match-string were formerly used in
78 ;; several places, because the -no-properties variants remove
79 ;; composition info. However, after some discussion on emacs-devel,
80 ;; the consensus was that the speed of the -no-properties variants was
81 ;; a worthwhile tradeoff especially since we're usually parsing files
82 ;; instead of hand-crafted XML.
84 ;;*******************************************************************
85 ;;**
86 ;;** Macros to parse the list
87 ;;**
88 ;;*******************************************************************
90 (defconst xml-undefined-entity "?"
91 "What to substitute for undefined entities")
93 (defvar xml-entity-alist
94 '(("lt" . "<")
95 ("gt" . ">")
96 ("apos" . "'")
97 ("quot" . "\"")
98 ("amp" . "&"))
99 "The defined entities. Entities are added to this when the DTD is parsed.")
101 (defvar xml-sub-parser nil
102 "Dynamically set this to a non-nil value if you want to parse an XML fragment.")
104 (defvar xml-validating-parser nil
105 "Set to non-nil to get validity checking.")
107 (defsubst xml-node-name (node)
108 "Return the tag associated with NODE.
109 Without namespace-aware parsing, the tag is a symbol.
111 With namespace-aware parsing, the tag is a cons of a string
112 representing the uri of the namespace with the local name of the
113 tag. For example,
115 <foo>
117 would be represented by
119 '(\"\" . \"foo\")."
121 (car node))
123 (defsubst xml-node-attributes (node)
124 "Return the list of attributes of NODE.
125 The list can be nil."
126 (nth 1 node))
128 (defsubst xml-node-children (node)
129 "Return the list of children of NODE.
130 This is a list of nodes, and it can be nil."
131 (cddr node))
133 (defun xml-get-children (node child-name)
134 "Return the children of NODE whose tag is CHILD-NAME.
135 CHILD-NAME should match the value returned by `xml-node-name'."
136 (let ((match ()))
137 (dolist (child (xml-node-children node))
138 (if (and (listp child)
139 (equal (xml-node-name child) child-name))
140 (push child match)))
141 (nreverse match)))
143 (defun xml-get-attribute-or-nil (node attribute)
144 "Get from NODE the value of ATTRIBUTE.
145 Return nil if the attribute was not found.
147 See also `xml-get-attribute'."
148 (cdr (assoc attribute (xml-node-attributes node))))
150 (defsubst xml-get-attribute (node attribute)
151 "Get from NODE the value of ATTRIBUTE.
152 An empty string is returned if the attribute was not found.
154 See also `xml-get-attribute-or-nil'."
155 (or (xml-get-attribute-or-nil node attribute) ""))
157 ;;*******************************************************************
158 ;;**
159 ;;** Creating the list
160 ;;**
161 ;;*******************************************************************
163 ;;;###autoload
164 (defun xml-parse-file (file &optional parse-dtd parse-ns)
165 "Parse the well-formed XML file FILE.
166 If FILE is already visited, use its buffer and don't kill it.
167 Returns the top node with all its children.
168 If PARSE-DTD is non-nil, the DTD is parsed rather than skipped.
169 If PARSE-NS is non-nil, then QNAMES are expanded."
170 (if (get-file-buffer file)
171 (with-current-buffer (get-file-buffer file)
172 (save-excursion
173 (xml-parse-region (point-min)
174 (point-max)
175 (current-buffer)
176 parse-dtd parse-ns)))
177 (with-temp-buffer
178 (insert-file-contents file)
179 (xml-parse-region (point-min)
180 (point-max)
181 (current-buffer)
182 parse-dtd parse-ns))))
185 (defvar xml-name-re)
186 (defvar xml-entity-value-re)
187 (defvar xml-att-def-re)
188 (let* ((start-chars (concat "[:alpha:]:_"))
189 (name-chars (concat "-[:digit:]." start-chars))
190 ;;[3] S ::= (#x20 | #x9 | #xD | #xA)+
191 (whitespace "[ \t\n\r]"))
192 ;;[4] NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6]
193 ;; | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF]
194 ;; | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF]
195 ;; | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
196 (defvar xml-name-start-char-re (concat "[" start-chars "]"))
197 ;;[4a] NameChar ::= NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040]
198 (defvar xml-name-char-re (concat "[" name-chars "]"))
199 ;;[5] Name ::= NameStartChar (NameChar)*
200 (defvar xml-name-re (concat xml-name-start-char-re xml-name-char-re "*"))
201 ;;[6] Names ::= Name (#x20 Name)*
202 (defvar xml-names-re (concat xml-name-re "\\(?: " xml-name-re "\\)*"))
203 ;;[7] Nmtoken ::= (NameChar)+
204 (defvar xml-nmtoken-re (concat xml-name-char-re "+"))
205 ;;[8] Nmtokens ::= Nmtoken (#x20 Nmtoken)*
206 (defvar xml-nmtokens-re (concat xml-nmtoken-re "\\(?: " xml-name-re "\\)*"))
207 ;;[66] CharRef ::= '&#' [0-9]+ ';' | '&#x' [0-9a-fA-F]+ ';'
208 (defvar xml-char-ref-re "\\(?:&#[0-9]+;\\|&#x[0-9a-fA-F]+;\\)")
209 ;;[68] EntityRef ::= '&' Name ';'
210 (defvar xml-entity-ref (concat "&" xml-name-re ";"))
211 ;;[69] PEReference ::= '%' Name ';'
212 (defvar xml-pe-reference-re (concat "%" xml-name-re ";"))
213 ;;[67] Reference ::= EntityRef | CharRef
214 (defvar xml-reference-re (concat "\\(?:" xml-entity-ref "\\|" xml-char-ref-re "\\)"))
215 ;;[10] AttValue ::= '"' ([^<&"] | Reference)* '"' | "'" ([^<&'] | Reference)* "'"
216 (defvar xml-att-value-re (concat "\\(?:\"\\(?:[^&\"]\\|" xml-reference-re "\\)*\"\\|"
217 "'\\(?:[^&']\\|" xml-reference-re "\\)*'\\)"))
218 ;;[56] TokenizedType ::= 'ID' [VC: ID] [VC: One ID per Element Type] [VC: ID Attribute Default]
219 ;; | 'IDREF' [VC: IDREF]
220 ;; | 'IDREFS' [VC: IDREF]
221 ;; | 'ENTITY' [VC: Entity Name]
222 ;; | 'ENTITIES' [VC: Entity Name]
223 ;; | 'NMTOKEN' [VC: Name Token]
224 ;; | 'NMTOKENS' [VC: Name Token]
225 (defvar xml-tokenized-type-re "\\(?:ID\\|IDREF\\|IDREFS\\|ENTITY\\|ENTITIES\\|NMTOKEN\\|NMTOKENS\\)")
226 ;;[58] NotationType ::= 'NOTATION' S '(' S? Name (S? '|' S? Name)* S? ')'
227 (defvar xml-notation-type-re (concat "\\(?:NOTATION" whitespace "(" whitespace "*" xml-name-re
228 "\\(?:" whitespace "*|" whitespace "*" xml-name-re "\\)*" whitespace "*)\\)"))
229 ;;[59] Enumeration ::= '(' S? Nmtoken (S? '|' S? Nmtoken)* S? ')' [VC: Enumeration] [VC: No Duplicate Tokens]
230 (defvar xml-enumeration-re (concat "\\(?:(" whitespace "*" xml-nmtoken-re
231 "\\(?:" whitespace "*|" whitespace "*" xml-nmtoken-re "\\)*"
232 whitespace ")\\)"))
233 ;;[57] EnumeratedType ::= NotationType | Enumeration
234 (defvar xml-enumerated-type-re (concat "\\(?:" xml-notation-type-re "\\|" xml-enumeration-re "\\)"))
235 ;;[54] AttType ::= StringType | TokenizedType | EnumeratedType
236 ;;[55] StringType ::= 'CDATA'
237 (defvar xml-att-type-re (concat "\\(?:CDATA\\|" xml-tokenized-type-re "\\|" xml-notation-type-re"\\|" xml-enumerated-type-re "\\)"))
238 ;;[60] DefaultDecl ::= '#REQUIRED' | '#IMPLIED' | (('#FIXED' S)? AttValue)
239 (defvar xml-default-decl-re (concat "\\(?:#REQUIRED\\|#IMPLIED\\|\\(?:#FIXED" whitespace "\\)*" xml-att-value-re "\\)"))
240 ;;[53] AttDef ::= S Name S AttType S DefaultDecl
241 (defvar xml-att-def-re (concat "\\(?:" whitespace "*" xml-name-re
242 whitespace "*" xml-att-type-re
243 whitespace "*" xml-default-decl-re "\\)"))
244 ;;[9] EntityValue ::= '"' ([^%&"] | PEReference | Reference)* '"'
245 ;; | "'" ([^%&'] | PEReference | Reference)* "'"
246 (defvar xml-entity-value-re (concat "\\(?:\"\\(?:[^%&\"]\\|" xml-pe-reference-re
247 "\\|" xml-reference-re "\\)*\"\\|'\\(?:[^%&']\\|"
248 xml-pe-reference-re "\\|" xml-reference-re "\\)*'\\)")))
249 ;;[75] ExternalID ::= 'SYSTEM' S SystemLiteral
250 ;; | 'PUBLIC' S PubidLiteral S SystemLiteral
251 ;;[76] NDataDecl ::= S 'NDATA' S
252 ;;[73] EntityDef ::= EntityValue| (ExternalID NDataDecl?)
253 ;;[71] GEDecl ::= '<!ENTITY' S Name S EntityDef S? '>'
254 ;;[74] PEDef ::= EntityValue | ExternalID
255 ;;[72] PEDecl ::= '<!ENTITY' S '%' S Name S PEDef S? '>'
256 ;;[70] EntityDecl ::= GEDecl | PEDecl
258 ;; Note that this is setup so that we can do whitespace-skipping with
259 ;; `(skip-syntax-forward " ")', inter alia. Previously this was slow
260 ;; compared with `re-search-forward', but that has been fixed. Also
261 ;; note that the standard syntax table contains other characters with
262 ;; whitespace syntax, like NBSP, but they are invalid in contexts in
263 ;; which we might skip whitespace -- specifically, they're not
264 ;; NameChars [XML 4].
266 (defvar xml-syntax-table
267 (let ((table (make-syntax-table)))
268 ;; Get space syntax correct per XML [3].
269 (dotimes (c 31)
270 (modify-syntax-entry c "." table)) ; all are space in standard table
271 (dolist (c '(?\t ?\n ?\r)) ; these should be space
272 (modify-syntax-entry c " " table))
273 ;; For skipping attributes.
274 (modify-syntax-entry ?\" "\"" table)
275 (modify-syntax-entry ?' "\"" table)
276 ;; Non-alnum name chars should be symbol constituents (`-' and `_'
277 ;; are OK by default).
278 (modify-syntax-entry ?. "_" table)
279 (modify-syntax-entry ?: "_" table)
280 ;; XML [89]
281 (unless (featurep 'xemacs)
282 (dolist (c '(#x00B7 #x02D0 #x02D1 #x0387 #x0640 #x0E46 #x0EC6 #x3005
283 #x3031 #x3032 #x3033 #x3034 #x3035 #x309D #x309E #x30FC
284 #x30FD #x30FE))
285 (modify-syntax-entry (decode-char 'ucs c) "w" table)))
286 ;; Fixme: rest of [4]
287 table)
288 "Syntax table used by `xml-parse-region'.")
290 ;; XML [5]
291 ;; Note that [:alpha:] matches all multibyte chars with word syntax.
292 (eval-and-compile
293 (defconst xml-name-regexp "[[:alpha:]_:][[:alnum:]._:-]*"))
295 ;; Fixme: This needs re-writing to deal with the XML grammar properly, i.e.
296 ;; document ::= prolog element Misc*
297 ;; prolog ::= XMLDecl? Misc* (doctypedecl Misc*)?
299 ;;;###autoload
300 (defun xml-parse-region (beg end &optional buffer parse-dtd parse-ns)
301 "Parse the region from BEG to END in BUFFER.
302 If BUFFER is nil, it defaults to the current buffer.
303 Returns the XML list for the region, or raises an error if the region
304 is not well-formed XML.
305 If PARSE-DTD is non-nil, the DTD is parsed rather than skipped,
306 and returned as the first element of the list.
307 If PARSE-NS is non-nil, then QNAMES are expanded."
308 ;; Use fixed syntax table to ensure regexp char classes and syntax
309 ;; specs DTRT.
310 (with-syntax-table (standard-syntax-table)
311 (let ((case-fold-search nil) ; XML is case-sensitive.
312 xml result dtd)
313 (save-excursion
314 (if buffer
315 (set-buffer buffer))
316 (save-restriction
317 (narrow-to-region beg end)
318 (goto-char (point-min))
319 (while (not (eobp))
320 (if (search-forward "<" nil t)
321 (progn
322 (forward-char -1)
323 (setq result (xml-parse-tag parse-dtd parse-ns))
324 (cond
325 ((null result)
326 ;; Not looking at an xml start tag.
327 (forward-char 1))
328 ((and xml (not xml-sub-parser))
329 ;; Translation of rule [1] of XML specifications
330 (error "XML: (Not Well-Formed) Only one root tag allowed"))
331 ((and (listp (car result))
332 parse-dtd)
333 (setq dtd (car result))
334 (if (cdr result) ; possible leading comment
335 (add-to-list 'xml (cdr result))))
337 (add-to-list 'xml result))))
338 (goto-char (point-max))))
339 (if parse-dtd
340 (cons dtd (nreverse xml))
341 (nreverse xml)))))))
343 (defun xml-maybe-do-ns (name default xml-ns)
344 "Perform any namespace expansion.
345 NAME is the name to perform the expansion on.
346 DEFAULT is the default namespace. XML-NS is a cons of namespace
347 names to uris. When namespace-aware parsing is off, then XML-NS
348 is nil.
350 During namespace-aware parsing, any name without a namespace is
351 put into the namespace identified by DEFAULT. nil is used to
352 specify that the name shouldn't be given a namespace."
353 (if (consp xml-ns)
354 (let* ((nsp (string-match ":" name))
355 (lname (if nsp (substring name (match-end 0)) name))
356 (prefix (if nsp (substring name 0 (match-beginning 0)) default))
357 (special (and (string-equal lname "xmlns") (not prefix)))
358 ;; Setting default to nil will insure that there is not
359 ;; matching cons in xml-ns. In which case we
360 (ns (or (cdr (assoc (if special "xmlns" prefix)
361 xml-ns))
362 "")))
363 (cons ns (if special "" lname)))
364 (intern name)))
366 (defun xml-parse-fragment (&optional parse-dtd parse-ns)
367 "Parse xml-like fragments."
368 (let ((xml-sub-parser t)
369 children)
370 (while (not (eobp))
371 (let ((bit (xml-parse-tag
372 parse-dtd parse-ns)))
373 (if children
374 (setq children (append (list bit) children))
375 (if (stringp bit)
376 (setq children (list bit))
377 (setq children bit)))))
378 (reverse children)))
380 (defun xml-parse-tag (&optional parse-dtd parse-ns)
381 "Parse the tag at point.
382 If PARSE-DTD is non-nil, the DTD of the document, if any, is parsed and
383 returned as the first element in the list.
384 If PARSE-NS is non-nil, then QNAMES are expanded.
385 Returns one of:
386 - a list : the matching node
387 - nil : the point is not looking at a tag.
388 - a pair : the first element is the DTD, the second is the node."
389 (let ((xml-validating-parser (or parse-dtd xml-validating-parser))
390 (xml-ns (if (consp parse-ns)
391 parse-ns
392 (if parse-ns
393 (list
394 ;; Default for empty prefix is no namespace
395 (cons "" "")
396 ;; "xml" namespace
397 (cons "xml" "http://www.w3.org/XML/1998/namespace")
398 ;; We need to seed the xmlns namespace
399 (cons "xmlns" "http://www.w3.org/2000/xmlns/"))))))
400 (cond
401 ;; Processing instructions (like the <?xml version="1.0"?> tag at the
402 ;; beginning of a document).
403 ((looking-at "<\\?")
404 (search-forward "?>")
405 (skip-syntax-forward " ")
406 (xml-parse-tag parse-dtd xml-ns))
407 ;; Character data (CDATA) sections, in which no tag should be interpreted
408 ((looking-at "<!\\[CDATA\\[")
409 (let ((pos (match-end 0)))
410 (unless (search-forward "]]>" nil t)
411 (error "XML: (Not Well Formed) CDATA section does not end anywhere in the document"))
412 (concat
413 (buffer-substring-no-properties pos (match-beginning 0))
414 (xml-parse-string))))
415 ;; DTD for the document
416 ((looking-at "<!DOCTYPE")
417 (let ((dtd (xml-parse-dtd parse-ns)))
418 (skip-syntax-forward " ")
419 (if xml-validating-parser
420 (cons dtd (xml-parse-tag nil xml-ns))
421 (xml-parse-tag nil xml-ns))))
422 ;; skip comments
423 ((looking-at "<!--")
424 (search-forward "-->")
425 nil)
426 ;; end tag
427 ((looking-at "</")
428 '())
429 ;; opening tag
430 ((looking-at "<\\([^/>[:space:]]+\\)")
431 (goto-char (match-end 1))
433 ;; Parse this node
434 (let* ((node-name (match-string-no-properties 1))
435 ;; Parse the attribute list.
436 (attrs (xml-parse-attlist xml-ns))
437 children pos)
439 ;; add the xmlns:* attrs to our cache
440 (when (consp xml-ns)
441 (dolist (attr attrs)
442 (when (and (consp (car attr))
443 (equal "http://www.w3.org/2000/xmlns/"
444 (caar attr)))
445 (push (cons (cdar attr) (cdr attr))
446 xml-ns))))
448 (setq children (list attrs (xml-maybe-do-ns node-name "" xml-ns)))
450 ;; is this an empty element ?
451 (if (looking-at "/>")
452 (progn
453 (forward-char 2)
454 (nreverse children))
456 ;; is this a valid start tag ?
457 (if (eq (char-after) ?>)
458 (progn
459 (forward-char 1)
460 ;; Now check that we have the right end-tag. Note that this
461 ;; one might contain spaces after the tag name
462 (let ((end (concat "</" node-name "\\s-*>")))
463 (while (not (looking-at end))
464 (cond
465 ((looking-at "</")
466 (error "XML: (Not Well-Formed) Invalid end tag (expecting %s) at pos %d"
467 node-name (point)))
468 ((= (char-after) ?<)
469 (let ((tag (xml-parse-tag nil xml-ns)))
470 (when tag
471 (push tag children))))
473 (let ((expansion (xml-parse-string)))
474 (setq children
475 (if (stringp expansion)
476 (if (stringp (car children))
477 ;; The two strings were separated by a comment.
478 (setq children (append (list (concat (car children) expansion))
479 (cdr children)))
480 (setq children (append (list expansion) children)))
481 (setq children (append expansion children))))))))
483 (goto-char (match-end 0))
484 (nreverse children)))
485 ;; This was an invalid start tag (Expected ">", but didn't see it.)
486 (error "XML: (Well-Formed) Couldn't parse tag: %s"
487 (buffer-substring-no-properties (- (point) 10) (+ (point) 1)))))))
488 (t ;; (Not one of PI, CDATA, Comment, End tag, or Start tag)
489 (unless xml-sub-parser ; Usually, we error out.
490 (error "XML: (Well-Formed) Invalid character"))
492 ;; However, if we're parsing incrementally, then we need to deal
493 ;; with stray CDATA.
494 (xml-parse-string)))))
496 (defun xml-parse-string ()
497 "Parse the next whatever. Could be a string, or an element."
498 (let* ((pos (point))
499 (string (progn (skip-chars-forward "^<")
500 (buffer-substring-no-properties pos (point)))))
501 ;; Clean up the string. As per XML specifications, the XML
502 ;; processor should always pass the whole string to the
503 ;; application. But \r's should be replaced:
504 ;; http://www.w3.org/TR/2000/REC-xml-20001006#sec-line-ends
505 (setq pos 0)
506 (while (string-match "\r\n?" string pos)
507 (setq string (replace-match "\n" t t string))
508 (setq pos (1+ (match-beginning 0))))
510 (xml-substitute-special string)))
512 (defun xml-parse-attlist (&optional xml-ns)
513 "Return the attribute-list after point.
514 Leave point at the first non-blank character after the tag."
515 (let ((attlist ())
516 end-pos name)
517 (skip-syntax-forward " ")
518 (while (looking-at (eval-when-compile
519 (concat "\\(" xml-name-regexp "\\)\\s-*=\\s-*")))
520 (setq end-pos (match-end 0))
521 (setq name (xml-maybe-do-ns (match-string-no-properties 1) nil xml-ns))
522 (goto-char end-pos)
524 ;; See also: http://www.w3.org/TR/2000/REC-xml-20001006#AVNormalize
526 ;; Do we have a string between quotes (or double-quotes),
527 ;; or a simple word ?
528 (if (looking-at "\"\\([^\"]*\\)\"")
529 (setq end-pos (match-end 0))
530 (if (looking-at "'\\([^']*\\)'")
531 (setq end-pos (match-end 0))
532 (error "XML: (Not Well-Formed) Attribute values must be given between quotes")))
534 ;; Each attribute must be unique within a given element
535 (if (assoc name attlist)
536 (error "XML: (Not Well-Formed) Each attribute must be unique within an element"))
538 ;; Multiple whitespace characters should be replaced with a single one
539 ;; in the attributes
540 (let ((string (match-string-no-properties 1))
541 (pos 0))
542 (replace-regexp-in-string "\\s-\\{2,\\}" " " string)
543 (let ((expansion (xml-substitute-special string)))
544 (unless (stringp expansion)
545 ; We say this is the constraint. It is acctually that
546 ; external entities nor "<" can be in an attribute value.
547 (error "XML: (Not Well-Formed) Entities in attributes cannot expand into elements"))
548 (push (cons name expansion) attlist)))
550 (goto-char end-pos)
551 (skip-syntax-forward " "))
552 (nreverse attlist)))
554 ;;*******************************************************************
555 ;;**
556 ;;** The DTD (document type declaration)
557 ;;** The following functions know how to skip or parse the DTD of
558 ;;** a document
559 ;;**
560 ;;*******************************************************************
562 ;; Fixme: This fails at least if the DTD contains conditional sections.
564 (defun xml-skip-dtd ()
565 "Skip the DTD at point.
566 This follows the rule [28] in the XML specifications."
567 (let ((xml-validating-parser nil))
568 (xml-parse-dtd)))
570 (defun xml-parse-dtd (&optional parse-ns)
571 "Parse the DTD at point."
572 (forward-char (eval-when-compile (length "<!DOCTYPE")))
573 (skip-syntax-forward " ")
574 (if (and (looking-at ">")
575 xml-validating-parser)
576 (error "XML: (Validity) Invalid DTD (expecting name of the document)"))
578 ;; Get the name of the document
579 (looking-at xml-name-regexp)
580 (let ((dtd (list (match-string-no-properties 0) 'dtd))
581 type element end-pos)
582 (goto-char (match-end 0))
584 (skip-syntax-forward " ")
585 ;; XML [75]
586 (cond ((looking-at "PUBLIC\\s-+")
587 (goto-char (match-end 0))
588 (unless (or (re-search-forward
589 "\\=\"\\([[:space:][:alnum:]-'()+,./:=?;!*#@$_%]*\\)\""
590 nil t)
591 (re-search-forward
592 "\\='\\([[:space:][:alnum:]-()+,./:=?;!*#@$_%]*\\)'"
593 nil t))
594 (error "XML: Missing Public ID"))
595 (let ((pubid (match-string-no-properties 1)))
596 (skip-syntax-forward " ")
597 (unless (or (re-search-forward "\\='\\([^']*\\)'" nil t)
598 (re-search-forward "\\=\"\\([^\"]*\\)\"" nil t))
599 (error "XML: Missing System ID"))
600 (push (list pubid (match-string-no-properties 1) 'public) dtd)))
601 ((looking-at "SYSTEM\\s-+")
602 (goto-char (match-end 0))
603 (unless (or (re-search-forward "\\='\\([^']*\\)'" nil t)
604 (re-search-forward "\\=\"\\([^\"]*\\)\"" nil t))
605 (error "XML: Missing System ID"))
606 (push (list (match-string-no-properties 1) 'system) dtd)))
607 (skip-syntax-forward " ")
608 (if (eq ?> (char-after))
609 (forward-char)
610 (if (not (eq (char-after) ?\[))
611 (error "XML: Bad DTD")
612 (forward-char)
613 ;; Parse the rest of the DTD
614 ;; Fixme: Deal with NOTATION, PIs.
615 (while (not (looking-at "\\s-*\\]"))
616 (skip-syntax-forward " ")
617 (cond
619 ;; Translation of rule [45] of XML specifications
620 ((looking-at
621 "<!ELEMENT\\s-+\\([[:alnum:].%;]+\\)\\s-+\\([^>]+\\)>")
623 (setq element (match-string-no-properties 1)
624 type (match-string-no-properties 2))
625 (setq end-pos (match-end 0))
627 ;; Translation of rule [46] of XML specifications
628 (cond
629 ((string-match "^EMPTY[ \t\n\r]*$" type) ;; empty declaration
630 (setq type 'empty))
631 ((string-match "^ANY[ \t\n\r]*$" type) ;; any type of contents
632 (setq type 'any))
633 ((string-match "^(\\(.*\\))[ \t\n\r]*$" type) ;; children ([47])
634 (setq type (xml-parse-elem-type (match-string-no-properties 1 type))))
635 ((string-match "^%[^;]+;[ \t\n\r]*$" type) ;; substitution
636 nil)
638 (if xml-validating-parser
639 (error "XML: (Validity) Invalid element type in the DTD"))))
641 ;; rule [45]: the element declaration must be unique
642 (if (and (assoc element dtd)
643 xml-validating-parser)
644 (error "XML: (Validity) Element declarations must be unique in a DTD (<%s>)"
645 element))
647 ;; Store the element in the DTD
648 (push (list element type) dtd)
649 (goto-char end-pos))
651 ;; Translation of rule [52] of XML specifications
652 ((looking-at (concat "<!ATTLIST[ \t\n\r]*\\(" xml-name-re
653 "\\)[ \t\n\r]*\\(" xml-att-def-re
654 "\\)*[ \t\n\r]*>"))
656 ;; We don't do anything with ATTLIST currently
657 (goto-char (match-end 0)))
659 ((looking-at "<!--")
660 (search-forward "-->"))
661 ((looking-at (concat "<!ENTITY[ \t\n\r]*\\(" xml-name-re
662 "\\)[ \t\n\r]*\\(" xml-entity-value-re
663 "\\)[ \t\n\r]*>"))
664 (let ((name (match-string-no-properties 1))
665 (value (substring (match-string-no-properties 2) 1
666 (- (length (match-string-no-properties 2)) 1))))
667 (goto-char (match-end 0))
668 (setq xml-entity-alist
669 (append xml-entity-alist
670 (list (cons name
671 (with-temp-buffer
672 (insert value)
673 (goto-char (point-min))
674 (xml-parse-fragment
675 xml-validating-parser
676 parse-ns))))))))
677 ((or (looking-at (concat "<!ENTITY[ \t\n\r]+\\(" xml-name-re
678 "\\)[ \t\n\r]+SYSTEM[ \t\n\r]+"
679 "\\(\"[^\"]*\"\\|'[^']*'\\)[ \t\n\r]*>"))
680 (looking-at (concat "<!ENTITY[ \t\n\r]+\\(" xml-name-re
681 "\\)[ \t\n\r]+PUBLIC[ \t\n\r]+"
682 "\"[- \r\na-zA-Z0-9'()+,./:=?;!*#@$_%]*\""
683 "\\|'[- \r\na-zA-Z0-9()+,./:=?;!*#@$_%]*'"
684 "[ \t\n\r]+\\(\"[^\"]*\"\\|'[^']*'\\)"
685 "[ \t\n\r]*>")))
686 (let ((name (match-string-no-properties 1))
687 (file (substring (match-string-no-properties 2) 1
688 (- (length (match-string-no-properties 2)) 1))))
689 (goto-char (match-end 0))
690 (setq xml-entity-alist
691 (append xml-entity-alist
692 (list (cons name (with-temp-buffer
693 (insert-file-contents file)
694 (goto-char (point-min))
695 (xml-parse-fragment
696 xml-validating-parser
697 parse-ns))))))))
698 ;; skip parameter entity declarations
699 ((or (looking-at (concat "<!ENTITY[ \t\n\r]+%[ \t\n\r]+\\(" xml-name-re
700 "\\)[ \t\n\r]+SYSTEM[ \t\n\r]+"
701 "\\(\"[^\"]*\"\\|'[^']*'\\)[ \t\n\r]*>"))
702 (looking-at (concat "<!ENTITY[ \t\n\r]+"
703 "%[ \t\n\r]+"
704 "\\(" xml-name-re "\\)[ \t\n\r]+"
705 "PUBLIC[ \t\n\r]+"
706 "\\(\"[- \r\na-zA-Z0-9'()+,./:=?;!*#@$_%]*\""
707 "\\|'[- \r\na-zA-Z0-9()+,./:=?;!*#@$_%]*'\\)[ \t\n\r]+"
708 "\\(\"[^\"]+\"\\|'[^']+'\\)"
709 "[ \t\n\r]*>")))
710 (goto-char (match-end 0)))
711 ;; skip parameter entities
712 ((looking-at (concat "%" xml-name-re ";"))
713 (goto-char (match-end 0)))
715 (when xml-validating-parser
716 (error "XML: (Validity) Invalid DTD item"))))))
717 (if (looking-at "\\s-*]>")
718 (goto-char (match-end 0))))
719 (nreverse dtd)))
721 (defun xml-parse-elem-type (string)
722 "Convert element type STRING into a Lisp structure."
724 (let (elem modifier)
725 (if (string-match "(\\([^)]+\\))\\([+*?]?\\)" string)
726 (progn
727 (setq elem (match-string-no-properties 1 string)
728 modifier (match-string-no-properties 2 string))
729 (if (string-match "|" elem)
730 (setq elem (cons 'choice
731 (mapcar 'xml-parse-elem-type
732 (split-string elem "|"))))
733 (if (string-match "," elem)
734 (setq elem (cons 'seq
735 (mapcar 'xml-parse-elem-type
736 (split-string elem ",")))))))
737 (if (string-match "[ \t\n\r]*\\([^+*?]+\\)\\([+*?]?\\)" string)
738 (setq elem (match-string-no-properties 1 string)
739 modifier (match-string-no-properties 2 string))))
741 (if (and (stringp elem) (string= elem "#PCDATA"))
742 (setq elem 'pcdata))
744 (cond
745 ((string= modifier "+")
746 (list '+ elem))
747 ((string= modifier "*")
748 (list '* elem))
749 ((string= modifier "?")
750 (list '\? elem))
752 elem))))
754 ;;*******************************************************************
755 ;;**
756 ;;** Substituting special XML sequences
757 ;;**
758 ;;*******************************************************************
760 (defun xml-substitute-special (string)
761 "Return STRING, after subsituting entity references."
762 ;; This originally made repeated passes through the string from the
763 ;; beginning, which isn't correct, since then either "&amp;amp;" or
764 ;; "&#38;amp;" won't DTRT.
766 (let ((point 0)
767 children end-point)
768 (while (string-match "&\\([^;]*\\);" string point)
769 (setq end-point (match-end 0))
770 (let* ((this-part (match-string-no-properties 1 string))
771 (prev-part (substring string point (match-beginning 0)))
772 (entity (assoc this-part xml-entity-alist))
773 (expansion
774 (cond ((string-match "#\\([0-9]+\\)" this-part)
775 (let ((c (decode-char
776 'ucs
777 (string-to-number (match-string-no-properties 1 this-part)))))
778 (if c (string c))))
779 ((string-match "#x\\([[:xdigit:]]+\\)" this-part)
780 (let ((c (decode-char
781 'ucs
782 (string-to-number (match-string-no-properties 1 this-part) 16))))
783 (if c (string c))))
784 (entity
785 (cdr entity))
786 ((eq (length this-part) 0)
787 (error "XML: (Not Well-Formed) No entity given"))
789 (if xml-validating-parser
790 (error "XML: (Validity) Undefined entity `%s'"
791 this-part)
792 xml-undefined-entity)))))
794 (cond ((null children)
795 ;; FIXME: If we have an entity that expands into XML, this won't work.
796 (setq children
797 (concat prev-part expansion)))
798 ((stringp children)
799 (if (stringp expansion)
800 (setq children (concat children prev-part expansion))
801 (setq children (list expansion (concat prev-part children)))))
802 ((and (stringp expansion)
803 (stringp (car children)))
804 (setcar children (concat prev-part expansion (car children))))
805 ((stringp expansion)
806 (setq children (append (concat prev-part expansion)
807 children)))
808 ((stringp (car children))
809 (setcar children (concat (car children) prev-part))
810 (setq children (append expansion children)))
812 (setq children (list expansion
813 prev-part
814 children))))
815 (setq point end-point)))
816 (cond ((stringp children)
817 (concat children (substring string point)))
818 ((stringp (car (last children)))
819 (concat (car (last children)) (substring string point)))
820 ((null children)
821 string)
823 (concat (mapconcat 'identity
824 (nreverse children)
826 (substring string point))))))
828 (defun xml-substitute-numeric-entities (string)
829 "Substitute SGML numeric entities by their respective utf characters.
830 This function replaces numeric entities in the input STRING and
831 returns the modified string. For example \"&#42;\" gets replaced
832 by \"*\"."
833 (if (and string (stringp string))
834 (let ((start 0))
835 (while (string-match "&#\\([0-9]+\\);" string start)
836 (condition-case nil
837 (setq string (replace-match
838 (string (read (substring string
839 (match-beginning 1)
840 (match-end 1))))
841 nil nil string))
842 (error nil))
843 (setq start (1+ (match-beginning 0))))
844 string)
845 nil))
847 ;;*******************************************************************
848 ;;**
849 ;;** Printing a tree.
850 ;;** This function is intended mainly for debugging purposes.
851 ;;**
852 ;;*******************************************************************
854 (defun xml-debug-print (xml &optional indent-string)
855 "Outputs the XML in the current buffer.
856 XML can be a tree or a list of nodes.
857 The first line is indented with the optional INDENT-STRING."
858 (setq indent-string (or indent-string ""))
859 (dolist (node xml)
860 (xml-debug-print-internal node indent-string)))
862 (defalias 'xml-print 'xml-debug-print)
864 (defun xml-escape-string (string)
865 "Return the string with entity substitutions made from
866 xml-entity-alist."
867 (mapconcat (lambda (byte)
868 (let ((char (char-to-string byte)))
869 (if (rassoc char xml-entity-alist)
870 (concat "&" (car (rassoc char xml-entity-alist)) ";")
871 char)))
872 ;; This differs from the non-unicode branch. Just
873 ;; grabbing the string works here.
874 string ""))
876 (defun xml-debug-print-internal (xml indent-string)
877 "Outputs the XML tree in the current buffer.
878 The first line is indented with INDENT-STRING."
879 (let ((tree xml)
880 attlist)
881 (insert indent-string ?< (symbol-name (xml-node-name tree)))
883 ;; output the attribute list
884 (setq attlist (xml-node-attributes tree))
885 (while attlist
886 (insert ?\ (symbol-name (caar attlist)) "=\""
887 (xml-escape-string (cdar attlist)) ?\")
888 (setq attlist (cdr attlist)))
890 (setq tree (xml-node-children tree))
892 (if (null tree)
893 (insert ?/ ?>)
894 (insert ?>)
896 ;; output the children
897 (dolist (node tree)
898 (cond
899 ((listp node)
900 (insert ?\n)
901 (xml-debug-print-internal node (concat indent-string " ")))
902 ((stringp node)
903 (insert (xml-escape-string node)))
905 (error "Invalid XML tree"))))
907 (when (not (and (null (cdr tree))
908 (stringp (car tree))))
909 (insert ?\n indent-string))
910 (insert ?< ?/ (symbol-name (xml-node-name xml)) ?>))))
912 (provide 'xml)
914 ;; arch-tag: 5864b283-5a68-4b59-a20d-36a72b353b9b
915 ;;; xml.el ends here