Building a Parser from scratch

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Course overview

Parsing or syntactic analysis is one of the first stages in designing and implementing a compiler. A well-designed syntax of your programming language is a big motivation why users would prefer and choose exactly your language.

Note: this is a practical class on building a manual Recursive-descent parser. If you’re interested in parsing theory and automated algorithms you may also consider the [ Parsing Algorithms ] class.


Recursive descent parsers are the group of parsers which are widely used on practice in many production programming languages. In contrast with automated parsing algorithms, the manual implementation allows having full control over the parsing process, and handling complex constructs, which may not be possible in the automatic parsers.

Besides, implementing a full manual parser from scratch allows understanding and seeing this process from inside, demystifying internal structures, and turning building parsers into an interesting engineering task.


In the Building a Parser from scratch class we dive into pure practical implementation, building and learning different aspects of parsers.

In this class you will learn concept of Recursive descent parsing, understand what is Tokenizer and how it cooperates with Parser module, learn what is Abstract Syntax Tree (AST), and how to have different formats of these ASTs, what is “lookahead” and the predictive parsing, and eventually build a parser for a full programming language, similar to Java or JavaScript.

Implementing a parser would also make your practical usage of other programming languages more professional.

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