...It explains how Go source files can be represented as semantically equivalent AST structures. The book focuses on the standard library packages behind this process, especially go/ast and go/token. It shows how tools such as formatting, documentation, parsing, and code analysis are built on top of syntax tree concepts. The repository includes chapter files, appendices, images, configuration, and build tooling for publishing the book online. It is aimed at Go developers who want to go beyond normal application programming and understand how Go code can be inspected, transformed, generated, and extended.