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Re: Additions to SVG 1.1 2nd Edition Conformance Tests

From: Chris Lilley <chris@w3.org>
Date: Sun, 21 Mar 2010 16:28:42 +0100
Message-ID: <1052659049.20100321162842@w3.org>
To: Johannes Rössel <johannes.roessel@uni-rostock.de>
CC: www-svg@w3.org
On Sunday, March 21, 2010, 1:58:27 PM, Johannes wrote:

JR> Hello,

>> It seems that the test expects this to result in a black line. Can
>> anyone explain why  please? The # does not seem to be valid according
>> to http://dev.w3.org/SVG/profiles/1.1F2/publish/paths.html#PathDataBNF,
>> so unless I'm reading it wrong the path is in error and should not be
>> drawn resulting in a red line being shown.

JR> If I'm reading the text below the BNF rules correctly:

JR> “The processing of the BNF must consume as much of a given BNF 
JR> production as possible, stopping at the point when a character is 
JR> encountered which no longer satisfies the production.”,

JR> then an error in the path data does not cease rendering of the path but
JR> instead tries to recover if possible and still render the path. So for
JR> the test case path data processing should stop when encountering the #
JR> sign but still draw everything that has been encountered until then.

Yes.

Indeed the test description (view source in the SVG file) says

      <p>
        The 'path' element's 'pathdata' attribute ignores additional whitespace, newline characters, and commas, and BNF processing consumes as much content as possible, stopping as soon as a character that doesn't satisfy the production is encountered.
      </p>
      <p>
        Various black path segments are rendered that each demonstrate one of the parsing rules. Each path segment is placed on top
        of a similar path segment that lacks the particular parsing rule that is being tested. Test passes if no red is visible.
      </p>

JR> Although the test case then wouldn't show an error condition if a 
JR> renderer decides to skip the # and draw the horizontal line up to 90; 
JR> perhaps that error would have best been inserted in the red line instead
JR> of the black.

Good point, I have made that change.

I also uncommented the test description and marked the test as reviewed.

-- 
 Chris Lilley                    mailto:chris@w3.org
 Technical Director, Interaction Domain
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG
Received on Sunday, 21 March 2010 15:28:44 GMT

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