Ohm v18 introduces a complete rewrite of its parsing engine, compiling PEG grammars directly into WebAssembly modules for dramatic performance gains—over 50x faster with 90% less memory usage. The post details the technical shift from AST interpretation to Wasm compilation, explaining optimizations like PExpr trees and control flow handling. This represents a significant advancement in parser technology with practical implications for language tooling and web development.
Background
Ohm is a parsing toolkit for JavaScript that uses parsing expression grammars (PEGs) to define languages. WebAssembly (Wasm) is a low-level binary instruction format for web browsers, enabling near-native performance.
- Source
- Lobsters
- Published
- Mar 24, 2026 at 11:58 PM
- Score
- 7.0 / 10