The article explains the design and implementation of Bike’s outline paths, a feature that allows efficient and expressive matching of rows and text runs in a tree-structured outline. It details the key components—including an Abstract Syntax Tree (AST) in Swift, a parser built with the swift-parsing library featuring tracing for syntax highlighting and error recovery, and an evaluator that walks the AST to produce query results—and provides links to tools and a simplified code example for developers to explore and understand the system.
https://www.hogbaysoftware.com/posts/bike-outline-path-implementation/