samples/packages/sass/src/ast/selector

Selector Abstract Syntax Tree

This directory contains the abstract syntax tree that represents a parsed CSS selector. This AST is constructed recursively by the selector parser. It's fully immutable.

Unlike the Sass AST, which is parsed from a raw source string before being evaluated, the selector AST is parsed during evaluation. This is necessary to ensure that there's a chance to resolve interpolation before fully parsing the selectors in question.

Although this AST doesn't include any SassScript, it does include a few Sass-specific constructs: the parent selector & and placeholder selectors. Parent selectors are resolved by the evaluator before it hands the AST off to the serializer, while placeholders are omitted in the serializer itself.