Creating Your Own Programming Language in Rust #1: Lexer

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This article walks through the first part of creating a custom programming language in Rust, focusing on the lexer. It explains the token model, source position tracking, and error handling for unknown characters and bounds checks. The post then shows how to tokenize operators, delimiters, identifiers, numbers, strings, booleans, and keywords such as if, while, fn, and return. It also includes test snippets that demonstrate lexer output and verify multi-character tokens like ==, !=, &&, and ||. The piece is aimed at developers who want to understand compiler construction and language tooling in Rust.

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