bug#20859: 25.0.50; css-mode: Comments within URIs

[Simen Heggestøyl]

On Sat, Aug 22, 2015 at 6:04 AM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

The question was not whether the regexp works, but what does the CSS language want us to do. I.e. is "url(foo)bar)" equivalent to "url('foo)bar')" or to "url('foo')bar)"?

Ah, good that you asked, because the CSS spec states the following:

  Some characters appearing in an unquoted URI, such as parentheses,

  white space characters, single quotes (') and double quotes ("),

  must be escaped with a backslash so that the resulting URI value is

  a URI token: '\(', '\)'.

So in "url(foo)bar)", the URI ends at the first ")", while in

"url(foo\)bar)", it ends at the last ")".

The following regexp seems to handle this:

"url\\((\\)[[:space:]]*\\(?:\\\\.\\|[^()[:space:]\n'\"]\\)+[[:space:]]*\\()\\)"

-- Simen