v1.3.0

Performance

Major performance improvements to pattern generation, achieving up to 40x speedup on warm queries and matching or exceeding kensaku.vim (jsmigemo + denops IPC) performance.

Warm queries (dictionary caches populated)

Input	v1.2.0	v1.3.0	Speedup
"a"	130ms	3ms	43x
"jo"	24ms	1ms	24x
"joutai"	0.6ms	0.03ms	20x

Key optimizations

• Eliminate coroutine overhead — Replace coroutine.wrap/yield with callback-based iteration, enabling LuaJIT JIT compilation of hot rank/select loops
• Iterative AA-tree insertion — Convert recursive insert_node/add_to_tree to iterative loops, enabling LuaJIT JIT compilation (previously caused NYI trace aborts)
• Multi-level caching:
  • Parent cache (FFI array) for LOUDSTrie reverse_lookup
  • Reverse lookup result cache per trie node
  • Mapping result cache per dictionary node (critical for incremental search)
  • Flat search result cache per query key
  • Query result memoization (repeated queries return in ~0.002ms)
• Pre-build parent cache at dictionary load time, shifting ~20ms from first query to load time
• Inline UTF-8 decoding in TernaryRegexGenerator, avoiding table allocation per word
• utf8_char result caching for repeated Unicode-to-UTF8 encoding

Compatibility

• jsmigemo pattern compatibility — Fix predictive romaji conversion to not recursively expand sokuon (っ). With the same dictionary, luamigemo now produces identical patterns to jsmigemo (only difference is kensaku.vim's \m prefix).
  • Before: じょう\%([たちつてと]\|っ[たちつてと]\)
  • After: じょう[たちっつてと] (matches jsmigemo)

Benchmarks

Added benchmark and comparison scripts in bench/:

• profile.lua — Internal phase-level profiling
• practical_bench.lua — Diverse query benchmark (80+ queries, incremental typing simulation)
• compare_patterns.lua — Pattern output comparison vs kensaku
• find_differences.lua — Comprehensive pattern difference scanner

See bench/README.md for usage.

API

No breaking changes. All public APIs remain backward compatible.

v1.2.0

Changes

set_rxop() を廃止し、query() の引数で rxop を指定する方式に変更

set_rxop() はシングルトンインスタンスの状態を変更するため、異なる箇所から get() で取得したインスタンス全てに影響してしまう問題がありました。

この変更により、rxop は query() のオプション引数として渡す方式になりました。インスタンスの状態を汚さず、呼び出しごとに正規表現方言を指定できます。

Before:

local m = migemo.get()
m:set_rxop(migemo.RXOP_VIM)
local pattern = m:query("tokyo")

After:

local pattern = migemo.query("tokyo", migemo.RXOP_VIM)

rxop を省略した場合のデフォルトは従来通り RXOP_PCRE です。

v1.1.1

Documentation

• lazy.nvim のプラグインスペック例に version = "*" を追加し、リリースバージョンへの固定を推奨するようにしました。

What's Changed

• Updated lazy.nvim plugin spec examples in both README.md and README.ja.md to recommend pinning to release versions with version = "*" for stability.

Full Changelog: v1.1.0...v1.1.1

v1.1.0

Simplify M.query() API

M.query() now takes only a word argument. Dictionary and regex operator configuration is done through the instance API.

Before

local migemo = require "luamigemo"
local pattern = migemo.query(nil, "kensaku", migemo.RXOP_PCRE)

After

local migemo = require "luamigemo"
local pattern = migemo.query("kensaku")

Customizing regex dialect or dictionary

Use migemo.get() to create an instance with full control:

local m = migemo.get()              -- bundled dict
m:set_rxop(migemo.RXOP_VIM)         -- Vim regex
local pattern = m:query("kensaku")

-- Or with a custom dictionary
local m = migemo.get("/path/to/dict")
m:set_rxop(migemo.RXOP_PCRE)
local pattern = m:query("kensaku")

v1.0.0

luamigemo v1.0.0

Pure Lua migemo engine for LuaJIT — romaji to regex converter for Japanese text search.

Features

• Romaji input to regex pattern conversion matching hiragana, katakana, and kanji
• BSD-licensed dictionary bundled — works out of the box with zero configuration
• PCRE and Vim regex dialect support (RXOP_PCRE / RXOP_VIM)
• No vim.* dependency in core — runs on any LuaJIT environment
• Singleton instance with dictionary caching for efficient repeated queries
• Predictive search with camelCase-aware query parsing
• Full/half-width and hiragana/katakana character conversion
• :checkhealth luamigemo support for Neovim

Install

-- lazy.nvim
{ "delphinus/luamigemo" }

# LuaRocks
luarocks install luamigemo

Usage

local migemo = require "luamigemo"
local pattern = migemo.query(nil, "kensaku", migemo.RXOP_PCRE)
-- => (?:kensaku|けんさく|ケンサク|検索|...)

Acknowledgements

Ported from oguna/jsmigemo. Dictionary data from oguna/yet-another-migemo-dict (BSD 3-Clause).