Build a Lexer: Tokenizing for Programming Languages

Have you ever wondered how programming languages convert human-readable code into something a computer can process? The journey begins with lexing, the essential first step in understanding code. This course will guide you through the fundamental concepts of lexing, enabling you to build a basic lexer capable of breaking down source code into a stream of tokens, laying the groundwork for more complex language processing. What you'll learn: * Understand what lexing is and its crucial role in programming language processing * Learn the concept of tokens, lexemes, and the tokenization process for various input types * Apply principles to design and implement a simple lexer for numbers, identifiers, and basic operators * Practice crafting regular expressions to define token patterns effectively * Explore basic error handling strategies within a lexer to manage invalid input * Understand the role of test-driven development in building robust lexers The course begins with core terminology and theoretical foundations, then progresses to practical exercises where you will design and implement your own lexer by reading and applying detailed written instructions and code examples. This course is designed for absolute beginners with no prior experience in compiler design or programming language theory. No specific prerequisites are required beyond a basic understanding of general programming concepts. Start your journey into programming language creation by mastering the art of lexing.