From 0abcdd7e4358cb902c320b008d3c04bde07b749e Mon Sep 17 00:00:00 2001 From: Patrick Simianer Date: Thu, 26 Feb 2026 19:28:22 +0100 Subject: Add Rust implementation of SCFG decoder Rust port of the Ruby prototype decoder with performance optimizations for real Hiero-style grammars: - Rule indexing by first terminal/NT symbol for fast lookup - Chart symbol interning (u16 IDs) instead of string hashing - Passive chart index by (symbol, left) for direct right-endpoint lookup - Items store rule index instead of cloned rule data Includes CKY+ parser, chart-to-hypergraph conversion, Viterbi decoding, derivation extraction, and JSON hypergraph I/O. Self-filling step in parse uses grammar lookup (not just remaining active items) to handle rules that were consumed during the parse loop or skipped by the has_any_at optimization. Produces identical output to the Ruby prototype on all test examples. Co-Authored-By: Claude Opus 4.6 --- rs/.gitignore | 1 + 1 file changed, 1 insertion(+) create mode 100644 rs/.gitignore (limited to 'rs/.gitignore') diff --git a/rs/.gitignore b/rs/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/rs/.gitignore @@ -0,0 +1 @@ +/target -- cgit v1.2.3