Tweaked by tabbott to not remove it from lister.py, linter_lib, and
friends, since those are intended to support both Python 2 and 3
(we're planning to extract them from the repository).
In this commit we modify our CSS parser not only to render the text from
a given CSS tokens produced but also enforce 4 space indentation on it.
Also we enforce some basic rules we would like our CSS to follow such as
* Always have "\n" in between the starting of body({) and body itself
and ending of the body and the closing of body(}).
* Use 4 space indents while having but something within the block
structure ( { .... } ).
* Have single space after ',' in between multiple selectors.
* Have only a single space in between selector and the starting of
block structure ({ ... }) if block structure starts on same line as
of selector.
eg. body {
body content here
}
Notice single space between 'body' and '{'.
Fixes: #1659.
This is a fairly major overhaul of the CSS parser to support
line numbers in error messages.
Basically, instead of passing "slices" of tokens around, we pass
indexes into the token arrays to all of our sub-parsers, which
allows them to have access to previous tokens in certain cases.
This is particularly important for errors where stuff is missing
(vs. being wrong).
In testing this out I found a few more places to catch errors.
Now, `tools/test-all` calls a new program called `tools/tests-tools`
that runs unit tests in `test_css_parser.py` and 'test_template_parser.py`.
This puts 100% line coverage on tools/lib/css_parser.py.
This puts about 50% line coverage on tools/lib/template_parser.py.
