diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/xml-fixed.el (renamed from lib/pg-xml.el) | 0 | ||||
-rw-r--r-- | lib/xml-pg.el | 507 |
2 files changed, 0 insertions, 507 deletions
diff --git a/lib/pg-xml.el b/lib/xml-fixed.el index 97e189a9..97e189a9 100644 --- a/lib/pg-xml.el +++ b/lib/xml-fixed.el diff --git a/lib/xml-pg.el b/lib/xml-pg.el deleted file mode 100644 index 97e189a9..00000000 --- a/lib/xml-pg.el +++ /dev/null @@ -1,507 +0,0 @@ -;;; xml.el --- XML parser - -;;; !!! This version has been modified from the version distributed with -;;; XEmacs to fix a bug parsing empty elements, for Proof General. - -;; Copyright (C) 2000, 2001 Free Software Foundation, Inc. - -;; Author: Emmanuel Briot <briot@gnat.com> -;; Maintainer: Emmanuel Briot <briot@gnat.com> -;; Keywords: xml - -;; This file is part of GNU Emacs. - -;; GNU Emacs is free software; you can redistribute it and/or modify -;; it under the terms of the GNU General Public License as published by -;; the Free Software Foundation; either version 2, or (at your option) -;; any later version. - -;; GNU Emacs is distributed in the hope that it will be useful, -;; but WITHOUT ANY WARRANTY; without even the implied warranty of -;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -;; GNU General Public License for more details. - -;; You should have received a copy of the GNU General Public License -;; along with GNU Emacs; see the file COPYING. If not, write to the -;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, -;; Boston, MA 02111-1307, USA. - -;;; Commentary: - -;; This file contains a full XML parser. It parses a file, and returns a list -;; that can be used internally by any other lisp file. -;; See some example in todo.el - -;;; FILE FORMAT - -;; It does not parse the DTD, if present in the XML file, but knows how to -;; ignore it. The XML file is assumed to be well-formed. In case of error, the -;; parsing stops and the XML file is shown where the parsing stopped. -;; -;; It also knows how to ignore comments, as well as the special ?xml? tag -;; in the XML file. -;; -;; The XML file should have the following format: -;; <node1 attr1="name1" attr2="name2" ...>value -;; <node2 attr3="name3" attr4="name4">value2</node2> -;; <node3 attr5="name5" attr6="name6">value3</node3> -;; </node1> -;; Of course, the name of the nodes and attributes can be anything. There can -;; be any number of attributes (or none), as well as any number of children -;; below the nodes. -;; -;; There can be only top level node, but with any number of children below. - -;;; LIST FORMAT - -;; The functions `xml-parse-file' and `xml-parse-tag' return a list with -;; the following format: -;; -;; xml-list ::= (node node ...) -;; node ::= (tag_name attribute-list . child_node_list) -;; child_node_list ::= child_node child_node ... -;; child_node ::= node | string -;; tag_name ::= string -;; attribute_list ::= (("attribute" . "value") ("attribute" . "value") ...) -;; | nil -;; string ::= "..." -;; -;; Some macros are provided to ease the parsing of this list - -;;; Code: - -(eval-and-compile - (defalias 'match-string-no-properties 'match-string)) - -;;******************************************************************* -;;** -;;** Macros to parse the list -;;** -;;******************************************************************* - -(defsubst xml-node-name (node) - "Return the tag associated with NODE. -The tag is a lower-case symbol." - (car node)) - -(defsubst xml-node-attributes (node) - "Return the list of attributes of NODE. -The list can be nil." - (nth 1 node)) - -(defsubst xml-node-children (node) - "Return the list of children of NODE. -This is a list of nodes, and it can be nil." - (cddr node)) - -(defun xml-get-children (node child-name) - "Return the children of NODE whose tag is CHILD-NAME. -CHILD-NAME should be a lower case symbol." - (let ((match ())) - (dolist (child (xml-node-children node)) - (if child - (if (equal (xml-node-name child) child-name) - (push child match)))) - (nreverse match))) - -(defun xml-get-attribute (node attribute) - "Get from NODE the value of ATTRIBUTE. -An empty string is returned if the attribute was not found." - (if (xml-node-attributes node) - (let ((value (assoc attribute (xml-node-attributes node)))) - (if value - (cdr value) - "")) - "")) - -;;******************************************************************* -;;** -;;** Creating the list -;;** -;;******************************************************************* - -(defun xml-parse-file (file &optional parse-dtd) - "Parse the well-formed XML FILE. -If FILE is already edited, this will keep the buffer alive. -Returns the top node with all its children. -If PARSE-DTD is non-nil, the DTD is parsed rather than skipped." - (let ((keep)) - (if (get-file-buffer file) - (progn - (set-buffer (get-file-buffer file)) - (setq keep (point))) - (find-file file)) - - (let ((xml (xml-parse-region (point-min) - (point-max) - (current-buffer) - parse-dtd))) - (if keep - (goto-char keep) - (kill-buffer (current-buffer))) - xml))) - -(defun xml-parse-region (beg end &optional buffer parse-dtd) - "Parse the region from BEG to END in BUFFER. -If BUFFER is nil, it defaults to the current buffer. -Returns the XML list for the region, or raises an error if the region -is not a well-formed XML file. -If PARSE-DTD is non-nil, the DTD is parsed rather than skipped, -and returned as the first element of the list" - (let (xml result dtd) - (save-excursion - (if buffer - (set-buffer buffer)) - (goto-char beg) - (while (< (point) end) - (if (search-forward "<" end t) - (progn - (forward-char -1) - (if (null xml) - (progn - (setq result (xml-parse-tag end parse-dtd)) - (cond - ((null result)) - ((listp (car result)) - (setq dtd (car result)) - (add-to-list 'xml (cdr result))) - (t - (add-to-list 'xml result)))) - - ;; translation of rule [1] of XML specifications - (error "XML files can have only one toplevel tag"))) - (goto-char end))) - (if parse-dtd - (cons dtd (nreverse xml)) - (nreverse xml))))) - - -(defun xml-parse-tag (end &optional parse-dtd) - "Parse the tag that is just in front of point. -The end tag must be found before the position END in the current buffer. -If PARSE-DTD is non-nil, the DTD of the document, if any, is parsed and -returned as the first element in the list. -Returns one of: - - a list : the matching node - - nil : the point is not looking at a tag. - - a cons cell: the first element is the DTD, the second is the node" - (cond - ;; Processing instructions (like the <?xml version="1.0"?> tag at the - ;; beginning of a document) - ((looking-at "<\\?") - (search-forward "?>" end) - (skip-chars-forward " \t\n") - (xml-parse-tag end)) - ;; Character data (CDATA) sections, in which no tag should be interpreted - ((looking-at "<!\\[CDATA\\[") - (let ((pos (match-end 0))) - (unless (search-forward "]]>" end t) - (error "CDATA section does not end anywhere in the document")) - (buffer-substring-no-properties pos (match-beginning 0)))) - ;; DTD for the document - ((looking-at "<!DOCTYPE") - (let (dtd) - (if parse-dtd - (setq dtd (xml-parse-dtd end)) - (xml-skip-dtd end)) - (skip-chars-forward " \t\n") - (if dtd - (cons dtd (xml-parse-tag end)) - (xml-parse-tag end)))) - ;; skip comments - ((looking-at "<!--") - (search-forward "-->" end) - nil) - ;; end tag - ((looking-at "</") - '()) - ;; opening tag - ((looking-at "<\\([^/> \t\n]+\\)") - (goto-char (match-end 1)) - (let* ((case-fold-search nil) ;; XML is case-sensitive. - (node-name (match-string 1)) - ;; Parse the attribute list. - (children (list (xml-parse-attlist end) (intern node-name))) - pos) - - ;; is this an empty element ? - (if (looking-at "/>") - (progn - (forward-char 2) - (nreverse children)) - - ;; is this a valid start tag ? - (if (eq (char-after) ?>) - (progn - (forward-char 1) - ;; Now check that we have the right end-tag. Note that this - ;; one might contain spaces after the tag name - (while (not (looking-at (concat "</" node-name "[ \t\n]*>"))) - (cond - ((looking-at "</") - (error (concat - "XML: invalid syntax -- invalid end tag (expecting " - node-name - ") at pos " (number-to-string (point))))) - ((= (char-after) ?<) - (let ((tag (xml-parse-tag end))) - (when tag - (push tag children)))) - (t - (setq pos (point)) - (search-forward "<" end) - (forward-char -1) - (let ((string (buffer-substring-no-properties pos (point))) - (pos 0)) - - ;; Clean up the string (no newline characters) - ;; Not done, since as per XML specifications, the XML processor - ;; should always pass the whole string to the application. - ;; (while (string-match "\\s +" string pos) - ;; (setq string (replace-match " " t t string)) - ;; (setq pos (1+ (match-beginning 0)))) - - (setq string (xml-substitute-special string)) - (setq children - (if (stringp (car children)) - ;; The two strings were separated by a comment. - (cons (concat (car children) string) - (cdr children)) - (cons string children))))))) - (goto-char (match-end 0)) - (if (> (point) end) - (error "XML: End tag for %s not found before end of region" - node-name)) - (nreverse children)) - - ;; This was an invalid start tag - (error "XML: Invalid attribute list") - )))) - (t ;; This is not a tag. - (error "XML: Invalid character")) - )) - -(defun xml-parse-attlist (end) - "Return the attribute-list that point is looking at. -The search for attributes end at the position END in the current buffer. -Leaves the point on the first non-blank character after the tag." - (let ((attlist ()) - name) - (skip-chars-forward " \t\n") - (while (looking-at "\\([a-zA-Z_:][-a-zA-Z0-9._:]*\\)[ \t\n]*=[ \t\n]*") - (setq name (intern (match-string 1))) - (goto-char (match-end 0)) - - ;; Do we have a string between quotes (or double-quotes), - ;; or a simple word ? - (unless (looking-at "\"\\([^\"]*\\)\"") - (unless (looking-at "'\\([^']*\\)'") - (error "XML: Attribute values must be given between quotes"))) - - ;; Each attribute must be unique within a given element - (if (assoc name attlist) - (error "XML: each attribute must be unique within an element")) - - (push (cons name (match-string-no-properties 1)) attlist) - (goto-char (match-end 0)) - (skip-chars-forward " \t\n") - (if (> (point) end) - (error "XML: end of attribute list not found before end of region")) - ) - (nreverse attlist))) - -;;******************************************************************* -;;** -;;** The DTD (document type declaration) -;;** The following functions know how to skip or parse the DTD of -;;** a document -;;** -;;******************************************************************* - -(defun xml-skip-dtd (end) - "Skip the DTD that point is looking at. -The DTD must end before the position END in the current buffer. -The point must be just before the starting tag of the DTD. -This follows the rule [28] in the XML specifications." - (forward-char (length "<!DOCTYPE")) - (if (looking-at "[ \t\n]*>") - (error "XML: invalid DTD (excepting name of the document)")) - (condition-case nil - (progn - (forward-word 1) ;; name of the document - (skip-chars-forward " \t\n") - (if (looking-at "\\[") - (re-search-forward "\\][ \t\n]*>" end) - (search-forward ">" end))) - (error (error "XML: No end to the DTD")))) - -(defun xml-parse-dtd (end) - "Parse the DTD that point is looking at. -The DTD must end before the position END in the current buffer." - (forward-char (length "<!DOCTYPE")) - (skip-chars-forward " \t\n") - (if (looking-at ">") - (error "XML: invalid DTD (excepting name of the document)")) - - ;; Get the name of the document - (looking-at "\\sw+") - (let ((dtd (list (match-string-no-properties 0) 'dtd)) - type element end-pos) - (goto-char (match-end 0)) - - (skip-chars-forward " \t\n") - - ;; External DTDs => don't know how to handle them yet - (if (looking-at "SYSTEM") - (error "XML: Don't know how to handle external DTDs")) - - (if (not (= (char-after) ?\[)) - (error "XML: Unknown declaration in the DTD")) - - ;; Parse the rest of the DTD - (forward-char 1) - (while (and (not (looking-at "[ \t\n]*\\]")) - (<= (point) end)) - (cond - - ;; Translation of rule [45] of XML specifications - ((looking-at - "[\t \n]*<!ELEMENT[ \t\n]+\\([a-zA-Z0-9.%;]+\\)[ \t\n]+\\([^>]+\\)>") - - (setq element (intern (match-string-no-properties 1)) - type (match-string-no-properties 2)) - (setq end-pos (match-end 0)) - - ;; Translation of rule [46] of XML specifications - (cond - ((string-match "^EMPTY[ \t\n]*$" type) ;; empty declaration - (setq type 'empty)) - ((string-match "^ANY[ \t\n]*$" type) ;; any type of contents - (setq type 'any)) - ((string-match "^(\\(.*\\))[ \t\n]*$" type) ;; children ([47]) - (setq type (xml-parse-elem-type (match-string-no-properties 1 type)))) - ((string-match "^%[^;]+;[ \t\n]*$" type) ;; substitution - nil) - (t - (error "XML: Invalid element type in the DTD"))) - - ;; rule [45]: the element declaration must be unique - (if (assoc element dtd) - (error "XML: elements declaration must be unique in a DTD (<%s>)" - (symbol-name element))) - - ;; Store the element in the DTD - (push (list element type) dtd) - (goto-char end-pos)) - - - (t - (error "XML: Invalid DTD item")) - ) - ) - - ;; Skip the end of the DTD - (search-forward ">" end) - (nreverse dtd))) - - -(defun xml-parse-elem-type (string) - "Convert a STRING for an element type into an elisp structure." - - (let (elem modifier) - (if (string-match "(\\([^)]+\\))\\([+*?]?\\)" string) - (progn - (setq elem (match-string 1 string) - modifier (match-string 2 string)) - (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]*\\([^+*?]+\\)\\([+*?]?\\)" 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 -;;** -;;******************************************************************* - -(defun xml-substitute-special (string) - "Return STRING, after subsituting special XML sequences." - (while (string-match "&" string) - (setq string (replace-match "&" t nil string))) - (while (string-match "<" string) - (setq string (replace-match "<" t nil string))) - (while (string-match ">" string) - (setq string (replace-match ">" t nil string))) - (while (string-match "'" string) - (setq string (replace-match "'" t nil string))) - (while (string-match """ string) - (setq string (replace-match "\"" t nil string))) - string) - -;;******************************************************************* -;;** -;;** 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 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 " ") - (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 |