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Re: xml.el produces incorrect sexp for empty element.


From: Mark A. Hershberger
Subject: Re: xml.el produces incorrect sexp for empty element.
Date: Fri, 30 May 2003 15:38:57 -0500
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (gnu/linux)

Thien-Thi Nguyen <address@hidden> writes:

> address@hidden (Mark A. Hershberger) writes:
>
>    * xml.el (xml-parse-tag): Fixed incorrect handling of empty elements.
>
> because i'm not an xml expert i don't understand what was incorrect
> before.  could you reword this in the sense of:
>
>   * xml.el (xml-parse-tag): Handle empty elements [IN CORRECT WAY].
>
> w/ a touch more detail on the correction made?

I did this with my previous patches, but since I made a mistake in
that last patch, thank you for the opportunity to fix my mistake.

    The old xml-parse-region parses the following two bits of XML into
    different sexps.

        "<xml/>" is parsed to ((xml nil ("")))

    while

        "<xml></xml>" is parsed to ((xml nil))

    <URL: http://www.w3.org/TR/2000/REC-xml-20001006#sec-starttags>
    states that "An element with no content is said to be empty.] The
    representation of an empty element is either a start-tag
    immediately followed by an end-tag, or an empty-element tag."

    So, "<xml/>" is equivilent to "<xml></xml>", but they don't parse
    the same in xml.el.
    
The following patch and changelog fix the problem.

address@hidden (Mark A. Hershberger) writes:                         
                                                                         
   * xml.el (xml-parse-tag): Fixed handling of empty elements so that
     "<x/>" parses the same as "<x></x>".

*** xml.el.~1.18.~      Thu Mar 20 12:01:04 2003
--- xml.el      Fri May 30 15:37:12 2003
***************
*** 221,228 ****
        ;; is this an empty element ?
        (if (looking-at "/[ \t\n\r]*>")
          (progn
!           (forward-char 2)
!           (nreverse (cons '("") children)))
  
        ;; is this a valid start tag ?
        (if (eq (char-after) ?>)
--- 221,228 ----
        ;; is this an empty element ?
        (if (looking-at "/[ \t\n\r]*>")
          (progn
!           (goto-char (match-end 0))
!           (nreverse children))
  
        ;; is this a valid start tag ?
        (if (eq (char-after) ?>)



-- 
As long as you have mystery you have health; when you destroy mystery
you create morbidity.                        -- G.K. Chesterson




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