Building a Code Formatter: Lexing, Parsing, and Syntax Trees

How do modern development tools understand, analyze, and format your code? Demystify the inner workings of compilers and static analysis tools by building your own syntax formatter from scratch. In this text-based course, you will progress from understanding raw source text to building a fully functioning formatter that parses types and structures. You will learn the mechanics of tokenization, tree generation, and code generation, gaining a deep conceptual foundation in language tooling. What you'll learn: 1. Understand foundational compiler phases, including lexical analysis, parsing, and code generation. 2. Convert raw source text into structured tokens using a custom lexer. 3. Build an abstract syntax tree (AST) that represents types and expressions accurately. 4. Practice handling type annotations and complex syntax structures during the parsing phase. 5. Implement formatting rules to print clean, consistent, and well-structured code. 6. Apply modern testing patterns to verify your parser and formatter outputs. You will start with essential terminology and the theory of formal grammars before moving step-by-step through lexer implementation, parser construction, and final output formatting. This course is designed for beginner to intermediate developers who want to understand how compilers and formatters work under the hood; no prior compiler experience is required. Start reading today to master the core mechanics of modern language tooling.