Apply skiplist to cssname parts

[eschoeffler]

When renaming by part, skip renaming parts that are in the except list of cssnames. This aligns renaming behavior with the was Google's module set server does renaming.

[google-cla[bot]]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[eschoeffler]

@googlebot I signed it!

[rzhw]

Looking at Closure Compiler, it seems like skipped names are applied prior to splitting, and not after.

Running Closure Stylesheets (the .jar here) seems to also replicate this, for example for a test.css containing:

.container, .full-height, .image.full-width {
  color: #000;
}

If we run Closure Stylesheets we get:

> java -jar ~/Downloads/closure-stylesheets.jar test.css --rename CLOSURE --excluded-classes-from-renaming full
.a,.b-c,.d.b-e{color:#000}
> java -jar ~/Downloads/closure-stylesheets.jar test.css --rename CLOSURE --excluded-classes-from-renaming full-height
.a,.full-height,.b.c-d{color:#000}

Can I confirm what behavior/config we're trying to align with?

[eschoeffler]

The goal is to align with the behavior used by Google's module set server. Google's module set server applies the skiplist to parts in addition to the whole. While this could be addressed in Google specific code, BY_PART renaming is primarily a Google use case, and so we should use Google's module set server renaming patterns as the canonical standard in this library.

[rzhw]

Thanks for clarifying!