[antlr-interest] Rule ignored in CSS grammar

[Michnay Balázs]

Hi Guys,

The attached grammar is supposed to parse CSS files. I used this as an
initial version:

http://www.antlr.org/grammar/1214945003224/csst3.g

First I tried to add a functionality to prevent "_" chars for property
names, so I created a new lexer rule "CSSPROPERTYNAME" to ensure this. The
"declaration" rule has been updated accordingly. The funny thing is that now
the "selector" rule fails to recognize tag selectors like:

.class_selector img {
  property: value;
  ...
}

Since my update should only affect property names and not selectors, I
really do not understand what the problem is. I tried to define lexer rules
as both fragments and literal values, no luck.

I used ANTLRWorks to debug this and have noticed that in the "selector" rule
"selectorOperation" is ignored:

selector
  : elem selectorOperation* attrib* pseudo? ->  elem selectorOperation*
attrib* pseudo*
  ;

Any ideas?

Thanks.
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