Subtrack

Lexical Analysis

Learn to break source code into tokens - the fundamental building blocks of compilation. Master tokenization, pattern matching, and error recovery.

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~360 Minutes 8 Challenges

write a lexer in C tutorial

About this subtrack

Lexical Analysis turns source text into tokens. You define token structs, scan identifiers and keywords, handle errors, and touch DFA and regex subset ideas. Primary query: "write a lexer from scratch." This is the first compiler stage you can finish in a weekend of focused tasks and reuse forever.

Lexical Analysis

About this subtrack

Tasks (8)

Token Struct Definition

Basic Lexer Implementation

Lexer Error Handling

Identifier and Keyword Recognition

Implement Keyword Recognition Using Hash Table

Add Error Recovery: Skip Invalid Characters

Build a Finite Automaton (DFA) and Use It to Drive Your Lexer

Write a Regex Engine Subset That Can Describe Token Patterns