Native selector and value parsing in PostCSS

I would like to make an ambitious proposal. In PostCSS 7, could we parse selectors and values, or provide that parsing functionality out-of-the-box? If so, how could I help?

At the lowest effort, could we integrate postcss-selector-parser and postcss-values-parser?

At a higher effort, could we integrate the tokenizers? And have one tokenization to rule them all?