tree 4a08953fd06e977dfff1e7e663bd7b654e8ea372
parent 5d0997fef755b6eeb815dab82213792971db3160
author Leon Senft <leonsenft@google.com> 1595627793 -0700
committer Leon Senft <leonsenft@users.noreply.github.com> 1595715465 -0700

Support parsing identifiers with escape codes in them

The output of `CssPrinter` will now also retain escape codes in identifiers.
This ensures they remain valid identifiers, as the escaped values may not parse
as valid identifiers.

The parser will also no longer accept an ID or class selector with space between
the first token (`#` or `.` respectively) and the identifier. The parser will
now fail immediately on these selector errors instead of attempting to recover.
Recovering in a robust manner is difficult given that this parser immediately
attempts to parse at the selector granularity, rather than first parsing the
style sheet into rules as described [here][parse-rule].

[parse-rule]: https://www.w3.org/TR/css-syntax-3/#consume-a-qualified-rule

Fixes https://github.com/dart-lang/csslib/issues/58.