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Free Download Crusty Interpreter
Released 11/2025
By David Beazley
MP4 | Video: h264, 1280x720 | Audio: AAC, 44.1 KHz, 2 Ch
Genre: eLearning | Language: English | Duration: 9 Lessons ( 27h 28m ) | Size: 3.3 GB
Challenge yourself by implementing an interpreter for a programming language that you don't know (Lox) in a programming language that you might not know (Rust) from a book that uses a programming language that a lot of people used to know (Java).
Overview
Sometimes in college, you would take one of THOSE courses where the professor shows up on the first day and gives out a modest first assignment like "design an CPU instruction set architecture", "implement the Unix shell from scratch", or "solve the Dirac equation." When faced with such a prospect, some students flee to higher ground while others start sporting a wry smile that says "bring it." This course is kind of like that.
Starting from nothing, you'll be dropped into Robert Nystrom's excellent Crafting Interpreters book and tasked with the problem of implementing a tokenizer and recursive descent parser as a first exposure to Rust programming. After that, things start to get hard.
Target Audience
This course is for experienced programmers who want to improve their programming skills by undertaking a good coding challenge in a modern programming language. Maybe you see yourself here
You've already programmed some Rust, but want to stretch your skills by undertaking a non-trivial project with many moving parts.
You've never written any Rust, but you're curious about it. You've previously written some kind of interpreter or compiler and based on that, you're reasonably sure you could swim if thrown into the deep end of the pool.
You've never written any Rust or an interpreter for that matter. However, you literally have nothing else going on (especially work) for the entire week and you feel up the challenge.
Seriously, this course is difficult in the same way that running a marathon is difficult. While it's happening, you'll probably be thinking WTF have I gotten myself into?!? However, when it's over, you'll feel pretty good about it.
Instruction Format
This is a week-long project course. At the start of each day, we'll discuss a variety of topics from programming language design and how they pertain to the Rust language and the project at hand. However, most of our time will be spent suffering, er, I mean "coding." There will be periodic discussion sessions throughout the day to discuss the difficulties encountered (if any).
Prerequisites
You should be experienced with common concepts from programming languages including expressions, statements, variables, control flow, functions, and classes. Prior experience implementing some kind of interpreter (in any programming language) will be helpful, but is not strictly required. No prior experience with Rust is assumed, but you should be prepared to jump into it at an accelerated pace. Rust is not the easiest language to learn, so expect a fair bit of fumbling around at the beginning.
Syllabus
The primary goal is to complete the first ten chapters of the Crafting Interpreters book wherein a tree-walking interpreter for the Lox programming language is created. In doing so, the following core topics related to programming language implementation get covered
Scanning/Tokenizing.
Recursive descent parsing.
Program representation and abstract syntax trees (ASTs).
Program execution.
Variables, scoping rules, and environments.
Control flow (conditionals, while loops, for-loops).
Functions, including higher-order functions and closures.
In implementing the interpreter, you will also be exposed to a variety of Rust programming issues including
Project organization (multiple files).
String manipulation
Error handling and optionals.
Testing.
Algebraic data types (structs and enums).
Recursive data types (trees, linked lists).
Pattern matching.
Ownership and borrowing rules.
Interior mutability.
The Crafting Interpreters book contains code samples for everything that needs to be coded, but they are all written in Java and make use of certain idioms that don't directly translate to Rust. Part of the challenge involves understanding the task at hand well enough to code it. This extra difficulty actually makes for interesting course discussion.
Homepage
Code:
https://www.dabeaz.com/crusty.html
Code:
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