This project is a PHP implementation of a CSS selector engine that transforms CSS selector strings into compatible XPath expressions for locating elements within documents. It serves as a converter and expression generator that maps CSS selection logic to the XPath query language.
The library processes selectors through a pipeline involving lexer-based tokenization and recursive descent parsing to create an abstract syntax tree. It utilizes pattern-matching logic to handle child and sibling relationships, translating CSS pseudo-classes and selectors into functional XPath logic.
These capabilities support document navigation and data extraction across HTML and XML structures, including applications in web scraping and automated browser testing.