Lightning Talk: Improving an HTML Parser with Swift 6 Pattern Matching

on YouTube ↗06m

" summary

A C++ HTML tokenizer for Ladybird LibWeb is rewired into Swift 6 pattern matching and choice types, replacing a macro-heavy giant switch with small functions that return enum results to drive the top-level state machine. The HTML spec requires roughly 80 parser states, and the reimplementation targets the tokenizer portion, emitting tokens, switching states, or EOF via pattern matches. The result compiles and runs, yielding a far clearer, testable state machine and removing goto/macros while matching the spec.

AI-written summary · about

" related talks

• 31mBuilding a Programming Language in SwiftChris Eidhof · UIKonf 2020
• 22mImproving Swift Tools with libSyntaxHarlan Haskins · try! Swift NYC 2017
• 27mAST Meta-programmingKishikawa Katsumi · try! Swift Tokyo 2018
• 38mCompilers aren’t magic, so let’s build one in SwiftBen Difrancesco · 360|iDev 2016
• 31mMaking the Most Out of SwiftAntoine van der Lee · iOS Conf SG 2023
• 01h 05mHTML: The Good PartsVadym Makeev · JavaScript fwdays'20
• 21mOptimizing Swift code for separation of concerns and simplicityJavier Soto · try! Swift Tokyo 2018
• 53mSwift: New Paradigms for iOS DevelopmentMarc Prud'Hommeaux · GOTO Copenhagen 2014