Bug 945 – Add checking for d attribute of SVG path element (path data) [was: Extra commas in path data should give an error]

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Bug 945 - Add checking for d attribute of SVG path element (path data) [was: Extra commas in path data should give an error]


Summary:	Add checking for d attribute of SVG path element (path data) [was: Extra comm...

Status:	RESOLVED FIXED

Product:	Validator.nu
Classification:	Unclassified
Component:	SVG 1.1 schema
Version:	HEAD
Hardware:	All All

Importance:	P2 normal
Assigned To:	Michael[tm] Smith

URL:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2012-11-13 15:07 CET by Simon Pieters
Modified:	2013-02-05 18:33 CET (History)
CC List:	2 users (show)

See Also:

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Description Simon Pieters 2012-11-13 15:07:46 CET

I hit this issue https://bugzilla.mozilla.org/show_bug.cgi?id=629897

v.nu didn't point out the error for me. (The bug referenced above claims it's an error.)

example:

<svg viewBox="0 0 10 10"><path d="M0,0,L5,5"/></svg>

Comment 1 Simon Pieters 2012-11-13 15:09:52 CET

(needs a stroke color to show something...)

<svg viewBox="0 0 10 10"><path stroke="#000" d="M0,0,L5,5"/></svg>

vs.

<svg viewBox="0 0 10 10"><path stroke="#000" d="M0,0L5,5"/></svg>

Comment 2 Michael[tm] Smith 2012-11-13 15:29:16 CET

So the thing is, we're just using the stock SVG 1.1 schema from http://www.w3.org/Graphics/SVG/1.1/rng/ as-is. And along with this bug, I know of at least one other, which was caused by the fact that the SVG WG published a "Second Edition" of SVG 1.1 with substantive changes but didn't update the schema. And when I asked them about that they told me that the schema is not a work product of the SVG WG and nobody plans to update it.

Given that I'm not really happy about needing to fix bugs in their schema that they rightly ought to be fixing themselves. But I guess I don't really have much choice at this point.

Comment 3 Michael[tm] Smith 2012-11-13 17:18:15 CET

I find http://xn--dahlstrm-t4a.net/svg/tools/scour/svg_regex.py from Erik Dahlstrom.  
Which might be port-able to the (Java) HTML5 datatype library that the validator uses, and which seems to do at least some actual error reporting. I'll check with Erik to see if it's up to date with SVG 1.1 2nd Edition.

Don't want to go anywhere near http://www.w3.org/Graphics/SVG/2002/01/pathdata.re ...

Comment 4 Michael[tm] Smith 2012-11-13 18:00:32 CET

http://svn.apache.org/repos/asf/xmlgraphics/batik/branches/svg11/sources/org/apache/batik/parser/PathParser.java might be usable

Comment 5 Henri Sivonen 2012-11-14 10:56:16 CET

(In reply to comment #4)
> http://svn.apache.org/repos/asf/xmlgraphics/batik/branches/svg11/sources/org/apache/batik/parser/PathParser.java
> might be usable

Copying and pasting this code (and its license header) seems like the best solution. Unfortunately, it introduces an Apache License dependency, but the datatype library already has for a license dependencies through Rhino.

Comment 6 Michael[tm] Smith 2012-11-15 08:23:27 CET

Implemented in my workspace and pushed to http://qa-dev.w3.org:8888/ for testing. Please give it a try.

If/when it's working as expected, I'll get a patch to Henri for review.

Comment 7 Simon Pieters 2012-11-15 10:10:58 CET

Would it be possible to somehow point at the character being in error? In real-world SVG, d="" is often huge and has commands repeated, making it difficult to spot the error with the current message. Here's a test case:

<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink">
	<path style="stroke-width:1;fill:rgb(246,127,0);stroke:none"
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<!-- Generated by Jasc WebDraw PR4(tm) on 06/07/01 12:18:39 -->
</svg>

Comment 8 Simon Pieters 2012-11-15 10:59:29 CET

<hsivonen> zcorpan: the datatype back end can report which character was the problem. I don’t recall how well (if at all) the front end handles that data
<hsivonen> zcorpan: but I expect it to not handle line breaks in the attribute value very well
<hsivonen> zcorpan: yeah, the front end doesn’t handle the error index given by the back end: http://html5.validator.nu/?doc=data%3Atext%2Fhtml%3Bcharset%3Dutf-8%2C%3C!DOCTYPE+html%3E%3Ctitle%3E%3C%2Ftitle%3E%3Cinput+type%3Drange+step%3D0.k5%3E

Comment 9 Michael[tm] Smith 2012-11-16 10:56:01 CET

(In reply to comment #7)
> Would it be possible to somehow point at the character being in error? In
> real-world SVG, d="" is often huge and has commands repeated, making it
> difficult to spot the error with the current message.

OK, I added a mechanism for more precise reporting of the context for the error. Please test it at http://qa-dev.w3.org:8888 and let me know what you think.

It should generate error messages like this: "Error: Bad value for attribute d on element path: Expected additional coordinate pair for M command but found C (context: M110.73 272.9,C)."

I also added a mechanism for truncating long extracts (>200 characters). It works on the client side by just setting "overflow: hidden" and "height: 72px" on an extract areas whose textContent is more than 200 characters. Let me know what you think of that too.

Note that when you do a find-on-page for the error-context text (e.g., "M110.73 272.9,C"), that mechanism has the benefit of making the extract area scroll to display that text (in IE, Opera, Chrome and WebKit at least, but not in Firefox).

Comment 10 Michael[tm] Smith 2013-02-05 18:33:04 CET

https://bitbucket.org/validator/syntax/commits/6a86b84cf574962604f656ac55f349ab1820390c