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[Bug 891] New: Basic stylesheet partitioning bug involving semicolon handling

From: <bugzilla@wiggum.w3.org>
Date: Mon, 27 Sep 2004 10:29:49 +0000
To: www-validator-cvs@w3.org
Message-Id: <E1CBslR-0006ry-2Z@wiggum.w3.org>


           Summary: Basic stylesheet partitioning bug involving semicolon
           Product: CSSValidator
           Version: CSS Validator
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P3
         Component: CSS 2.0
        AssignedTo: ot@w3.org
        ReportedBy: roth@visualclick.de
         QAContact: www-validator-cvs@w3.org

The following stylesheet:
  @chars [.-;abc];
  p {color: red}

yields as effective result:

  p {color: red}

This is wrong according to the specs, the effective style sheet should be empty. Reason:

A stylesheet consists of rule-sets and at-rules. The above stylesheet partitioned according to the 
recognition rules for both of these looks like:

ATRULE="@chars [.-;"
The at-rule extends up to the first semicolon as there is no block.

RULESET="abc];p {color:red}"
This is because we parse until we find the end of the first block, and it cannot be an at-rule since it 
doesn't start with "@...".

So the stylesheet consists of two rules, an ATRULE and a RULESET. Let's have a look at the rule-set: 
The selector is everything up to the first opening brace, so the selector is "abc];p " . This is a 
selector which cannot be parsed according to selector rules, hence it is invalid. If a selector is 
invalid, it and its corresponding declaration block must be discarded. Follows that the RULESET 
must be discarded.

Since the ATRULE consists of an unknown ATKEYWORD, it is discarded. Likewise, due to its invalid 
selector, the RULESET is discarded, so effectively the resulting stylesheet is the empty stylesheet. 
That's however not what the validator delivers as result, so this must be considered a bug.

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Received on Monday, 27 September 2004 10:29:49 UTC

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