clean-css 4.0

Hey folks,

So several new commits, I’ve been working on for a while, just landed in master. So far there’s a much simpler tokenizer & import inliner, while the optimizations are basically the same as in 3.4.

However the latter is going to change as well. Here are some ideas:

• regroupsimple and advanced optimizations into optimization levels, similar to gcc, i.e. -O0 (no optimizations just import inlining & rebasing), -O1 (default - same as basic previously), -O2 (same as advanced previously but with disabled restructuring) - EDIT: see #850 - DONE
• ability to turn on/off any optimization in both API and CLI - EDIT: see #850 - DONE
• whitelist -O1 optimizations based on property name (how to handle shorthands?) instead of trying to blindly apply all optimizations to every and each value - EDIT: it’d nice but have but let’s leave it for 4.1.

And some other ideas for 4.0 not covered in tickets yet:

• change CleanCSS#minify method to minify(styles, sourceMap, callback) or minify(styles, callback) so sourceMap can be passed directly instead of via constructor as it does not belong there - DONE in #857
• merge processImport and processImportFrom into one imports flag which defaults to local - which means remote imports being disabled by default - DONE as new inline option
• code in the current master gets rid of root, relativeTo, target options in favor of just a single option rebaseTo - this means all URLs has to be relative to the current directory, or, in case of imported files, relative to the imported file. All absolute URLs are left as they are. See da45a94c9f62a957c5a9baf940ba2299967b8632. I wonder if that’s enough. There was once an idea to allow specifying target value as a function, so maybe allowing rebaseTo to be a function is a way to cover many use cases not covered above?

Feedback is more than welcome! Jakub

[jakubpawlowicz]

4.0 is out. Thanks again!

[jakubpawlowicz]

Closing this ticket as 4.0 is feature ready. Thanks @ngyikp @ben-eb @madwizard-thomas @alexlamsl for your valuable input! 💯