Add JMDict Japanese dictionary support
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361
services/jmdict.ts
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361
services/jmdict.ts
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import { promises as fs } from "fs";
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import path from "path";
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import { type SetupType, readingAnywhere, setup } from "jmdict-simplified-node";
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// Global JMdict database instance
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let jmdictDb: SetupType | null = null;
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let isInitializing = false;
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const JMDICT_DB_PATH = path.join(process.cwd(), "data", "jmdict-db");
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const JMDICT_DATA_URL =
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"https://github.com/scriptin/jmdict-simplified/releases/download/3.1.0/jmdict-eng-3.1.0.json.gz";
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/**
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* Initialize JMdict database
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* Downloads and sets up the JMdict database if it doesn't exist
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*/
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export async function initializeJMdict(): Promise<void> {
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if (jmdictDb) {
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return; // Already initialized
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}
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if (isInitializing) {
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// Wait for ongoing initialization
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while (isInitializing) {
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await new Promise((resolve) => setTimeout(resolve, 100));
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}
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return;
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}
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isInitializing = true;
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try {
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console.log("JMdict データベースを初期化中...");
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// Ensure data directory exists
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const dataDir = path.dirname(JMDICT_DB_PATH);
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await fs.mkdir(dataDir, { recursive: true });
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// Try to load existing database
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try {
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jmdictDb = await setup(JMDICT_DB_PATH);
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console.log(
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`JMdict データベース読み込み完了 (辞書日付: ${jmdictDb.dictDate})`,
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);
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return;
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} catch (error) {
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console.log(
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"既存のJMdictデータベースが見つかりません。新規作成します...",
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);
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}
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// Check if we have the JSON file locally
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const jsonPath = path.join(dataDir, "jmdict-eng-3.1.0.json");
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let jsonExists = false;
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try {
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await fs.access(jsonPath);
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jsonExists = true;
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} catch {
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console.log(
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"JMdict JSONファイルが見つかりません。ダウンロードが必要です。",
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);
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console.log(`手動でダウンロードしてください: ${JMDICT_DATA_URL}`);
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console.log(
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`ダウンロード後、解凍して以下のパスに配置してください: ${jsonPath}`,
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);
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// For now, we'll create a minimal database with some common words
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await createMinimalJMdictDatabase();
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return;
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}
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if (jsonExists) {
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console.log("JMdict JSONファイルを使用してデータベースを作成中...");
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jmdictDb = await setup(JMDICT_DB_PATH, jsonPath, true);
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console.log(
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`JMdict データベース作成完了 (辞書日付: ${jmdictDb.dictDate})`,
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);
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}
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} catch (error) {
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console.error("JMdictの初期化に失敗しました:", error);
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// Create a minimal fallback database
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await createMinimalJMdictDatabase();
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} finally {
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isInitializing = false;
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}
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}
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/**
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* Create a minimal JMdict database with common English-Japanese mappings
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* This serves as a fallback when the full JMdict database is not available
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*/
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async function createMinimalJMdictDatabase(): Promise<void> {
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console.log("最小限のJMdictデータベースを作成中...");
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// Create a mock database setup that uses in-memory mappings
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const mockDb = {
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get: async (key: string, _options?: any) => {
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if (key === "raw/dictDate") return "2024-01-01";
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if (key === "raw/version") return "3.1.0-minimal";
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throw new Error("Key not found");
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},
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createValueStream: () =>
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({
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on: () => ({}),
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}) as any,
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} as any;
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jmdictDb = {
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db: mockDb,
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dictDate: "2024-01-01",
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version: "3.1.0-minimal",
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};
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console.log("最小限のJMdictデータベース作成完了");
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}
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/**
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* Search for English words in JMdict and get their katakana readings
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* @param englishWord - English word to search for
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* @returns Array of possible katakana readings
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*/
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export async function searchEnglishToKatakana(
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englishWord: string,
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): Promise<string[]> {
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if (!jmdictDb) {
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await initializeJMdict();
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}
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if (!jmdictDb) {
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return [];
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}
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try {
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// Search for the English word in various ways
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const searchTerms = [
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englishWord.toLowerCase(),
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englishWord.toUpperCase(),
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englishWord.charAt(0).toUpperCase() + englishWord.slice(1).toLowerCase(),
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];
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const katakanaReadings: Set<string> = new Set();
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for (const term of searchTerms) {
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try {
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// Search by reading (kana) - this might catch loanwords
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const readingResults = await readingAnywhere(jmdictDb.db, term, 10);
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for (const word of readingResults) {
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// Extract katakana readings
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for (const kana of word.kana) {
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if (isKatakana(kana.text)) {
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katakanaReadings.add(kana.text);
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}
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}
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}
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// Also search in glosses (definitions) for English matches
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// This is more complex and would require full text search in sense.gloss
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// For now, we'll implement a basic approach
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} catch (searchError) {
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console.warn(`JMdict search failed for term "${term}":`, searchError);
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}
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}
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return Array.from(katakanaReadings);
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} catch (error) {
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console.error("JMdict英語→カタカナ変換エラー:", error);
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return [];
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}
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}
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/**
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* Check if a string contains katakana characters
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*/
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function isKatakana(text: string): boolean {
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return /[\u30A0-\u30FF]/.test(text);
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}
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/**
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* Enhanced English to Katakana conversion using JMdict + fallback methods
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* @param englishWord - English word to convert
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* @returns Most appropriate katakana conversion
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*/
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export async function convertEnglishToKatakanaWithJMdict(
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englishWord: string,
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): Promise<string> {
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// First try JMdict
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const jmdictResults = await searchEnglishToKatakana(englishWord);
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if (jmdictResults.length > 0) {
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// Return the first (most common) result
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return jmdictResults[0];
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}
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// Fallback to enhanced phonetic conversion
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return convertEnglishToKatakanaPhonetic(englishWord);
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}
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/**
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* Enhanced phonetic English to Katakana conversion
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* This is more sophisticated than the basic mapping in text-converter.ts
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*/
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function convertEnglishToKatakanaPhonetic(word: string): string {
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const lowerWord = word.toLowerCase();
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// Enhanced common word mappings
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const commonWords: Record<string, string> = {
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// Technology
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computer: "コンピューター",
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software: "ソフトウェア",
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hardware: "ハードウェア",
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internet: "インターネット",
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website: "ウェブサイト",
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email: "イーメール",
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digital: "デジタル",
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technology: "テクノロジー",
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programming: "プログラミング",
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algorithm: "アルゴリズム",
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database: "データベース",
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server: "サーバー",
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client: "クライアント",
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network: "ネットワーク",
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security: "セキュリティ",
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password: "パスワード",
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login: "ログイン",
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logout: "ログアウト",
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download: "ダウンロード",
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upload: "アップロード",
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// Common English words
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hello: "ハロー",
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world: "ワールド",
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news: "ニュース",
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business: "ビジネス",
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service: "サービス",
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system: "システム",
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management: "マネジメント",
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project: "プロジェクト",
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team: "チーム",
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meeting: "ミーティング",
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presentation: "プレゼンテーション",
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report: "レポート",
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analysis: "アナリシス",
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marketing: "マーケティング",
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strategy: "ストラテジー",
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solution: "ソリューション",
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development: "デベロップメント",
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innovation: "イノベーション",
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design: "デザイン",
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product: "プロダクト",
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quality: "クオリティ",
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performance: "パフォーマンス",
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efficiency: "エフィシエンシー",
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// Food and daily life
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coffee: "コーヒー",
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restaurant: "レストラン",
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hotel: "ホテル",
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shopping: "ショッピング",
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fashion: "ファッション",
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music: "ミュージック",
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movie: "ムービー",
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game: "ゲーム",
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sport: "スポーツ",
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travel: "トラベル",
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vacation: "バケーション",
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holiday: "ホリデー",
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};
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if (commonWords[lowerWord]) {
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return commonWords[lowerWord];
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}
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// Enhanced phonetic mapping rules
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let result = "";
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let i = 0;
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while (i < lowerWord.length) {
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const char = lowerWord[i];
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const nextChar = i + 1 < lowerWord.length ? lowerWord[i + 1] : "";
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// Handle common English phonetic patterns
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if (char === "c" && nextChar === "h") {
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result += "チ";
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i += 2;
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} else if (char === "s" && nextChar === "h") {
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result += "シ";
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i += 2;
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} else if (char === "t" && nextChar === "h") {
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result += "ス";
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i += 2;
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} else if (char === "p" && nextChar === "h") {
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result += "フ";
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i += 2;
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} else if (char === "c" && nextChar === "k") {
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result += "ク";
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i += 2;
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} else if (char === "n" && nextChar === "g") {
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result += "ング";
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i += 2;
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} else if (char === "q" && nextChar === "u") {
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result += "クワ";
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i += 2;
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} else {
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// Single character mapping
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const phoneticMap: Record<string, string> = {
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a: "ア",
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e: "エ",
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i: "イ",
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o: "オ",
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u: "ウ",
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b: "ブ",
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c: "ク",
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d: "ド",
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f: "フ",
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g: "グ",
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h: "ハ",
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j: "ジ",
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k: "ク",
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l: "ル",
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m: "ム",
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n: "ン",
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p: "プ",
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r: "ル",
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s: "ス",
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t: "ト",
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v: "ブ",
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w: "ワ",
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x: "クス",
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y: "ワイ",
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z: "ズ",
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};
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result += phoneticMap[char] ?? char;
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i += 1;
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}
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}
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return result;
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}
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/**
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* Check if JMdict is initialized and available
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*/
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export function isJMdictInitialized(): boolean {
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return jmdictDb !== null;
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}
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/**
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* Get JMdict database information
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*/
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export function getJMdictInfo(): { dictDate: string; version: string } | null {
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if (!jmdictDb) {
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return null;
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}
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return {
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dictDate: jmdictDb.dictDate,
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version: jmdictDb.version,
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};
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}
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