Module rules 

Rule-based HS code classification engine.

The engine uses a static CAS → HS mapping table (static_table) and a shape/purity matcher (matcher) to classify known compounds without any LLM calls.

Modules

jp_table

Japan Customs 統計品目番号 (statistical item code) lookup table.

matcher

Rule matching logic — selects the best HsRule for a given CAS number, physical form, and optional purity.

static_table

Compile-time embedded CAS → HS code mapping table.

types

Types for the static HS rule table.