Taming the Flat AST: Ergonomics in the Age of Zero Allocations
Summary
The article discusses egg, a Go-based LL(1) parser generator that uses a flat AST encoded as a single []int32, achieving high performance and low GC pressure. It introduces ergonomic patterns: a lightweight view into the AST, a Go 1.23 iterator-based traversal, and an example showing how to preserve readability while maintaining zero-alloc semantics. The piece also covers advanced lookahead with iter.Pull to handle LL(1) parsing decisions.