Building a Trilingual Input Method: Chinese, Japanese, and English in One Keyboard

Type three languages without switching. Built on RIME, powered by open source.

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I speak three languages. I type in three languages. And I was tired of constantly switching input methods.

Chinese IME → Japanese IME → English keyboard → back to Chinese. Repeat hundreds of times a day. Every switch breaks my flow. Every switch costs keystrokes.

So I built rime-snomiao: a unified input method that handles Chinese (Pinyin and Wubi), Japanese (Romaji), and English - all at once, in the same input session.

No switching. No hotkeys. Just type.

The Problem: Input Method Hell

If you're multilingual, you know the pain:

• Chinese needs an IME to convert Pinyin/Wubi to characters
• Japanese needs an IME to convert Romaji to Hiragana/Katakana/Kanji
• English is just... direct typing

Most operating systems treat these as completely separate modes. Want to type a Chinese sentence with a Japanese word? Switch IME. Want to add an English term? Switch again.

Even worse: many proprietary IMEs collect your typing data. Every keystroke sent to some cloud server.

I needed something better.

The Solution: RIME

RIME (Rime Input Method Engine / 中州韻輸入法引擎) is an open-source input method framework. Think of it as a programmable typing engine:

• Cross-platform (Windows, macOS, Linux)
• Fully customizable via YAML config files
• Zero data collection - everything runs locally
• Supports multiple input schemas simultaneously

The key insight: RIME doesn't care what language you're typing. It just maps input sequences to output characters based on your configuration.

So I configured it to handle all three languages at once.

How It Works

Mixed Mode Input

In rime-snomiao, you never switch modes. The system recognizes what you're typing:

nihao     → 你好 (Chinese Pinyin)
wbig      → 大 (Chinese Wubi code)
konnichiwa → こんにちは (Japanese Romaji)
hello     → hello (English passthrough)

All in the same input session. The engine uses context and dictionary matching to determine which language you intend.

Chinese: Wubi + Pinyin Hybrid

For Chinese, I combined two input methods:

Wubi (五笔) - A shape-based method where each key represents a component. Fast and precise, but requires memorizing codes.

Pinyin (拼音) - Sound-based input. Easier to learn, but slower due to homophone selection.

With rime-snomiao, you can mix them:

• Type full Wubi codes for common characters
• Fall back to Pinyin when you forget a code
• Press z for Pinyin reverse lookup

Japanese: Romaji to Everything

Japanese input converts Romaji to:

• Hiragana (あいうえお)
• Katakana (アイウエオ)
• Kanji (漢字)

The dictionary includes:

• Google Mozc vocabulary
• JMDict (comprehensive Japanese dictionary)
• Japanese names and place names

Built-in Translation

One killer feature: integrated translation lookups.

Trigger	Function
Type English	Get Chinese translation candidates
Type English	Get Japanese translation candidates
Type Chinese	Get English translation candidates

Learning vocabulary while you type. No separate dictionary app needed.

Technical Architecture

Schema Files

Each input mode is defined by a schema:

# snomiao.schema.yaml - The unified schema
schema:
  schema_id: snomiao
  name: 雪星全能
  version: "2024.1"

engine:
  processors:
    - punctuator
    - selector
    - navigator
    - express_editor
  segmentors:
    - abc_segmentor
    - punct_segmentor
  translators:
    - punct_translator
    - script_translator
    - table_translator@wubi
    - table_translator@pinyin
    - table_translator@japanese

Dictionary Structure

Dictionaries are simple TSV-like YAML:

# japanese.dict.yaml
---
name: japanese
version: "1.0"
sort: by_weight
...

あ	a	100
い	i	100
う	u	100
漢字	kanji	50
日本語	nihongo	80

Snowstar-Wubi Enhancement

My Wubi variant includes:

• Variable-length encoding (type fewer keys for common words)
• Long sentence optimization
• Microsoft Wubi 86 code table base

Installation

Windows (Recommended: npx)

# One command - installs Weasel + configures everything
npx rime-snomiao@latest

Windows (Manual)

1. Install Weasel (RIME for Windows)
2. Download rime-snomiao release
3. Extract Rime/* to %APPDATA%\Rime
4. Right-click tray icon → Deploy

macOS

# Install Squirrel (RIME for macOS)
brew install squirrel --cask

# Clone and configure
git clone https://github.com/snomiao/rime-snomiao
cp -r ./rime-snomiao/Rime/* ~/Library/Rime/

# Deploy from menu bar icon

Linux

# Install ibus-rime or fcitx-rime via your package manager
# Then copy configuration to ~/.config/ibus/rime/

Daily Usage

After a week of using rime-snomiao:

Before:

• Ctrl+Space to switch to Chinese
• Type Chinese
• Ctrl+Space to switch to Japanese
• Type Japanese
• Ctrl+Space to switch to English
• Repeat ad nauseam

After:

• Just type
• Everything works

Quick Reference

Input	Output	Method
nihao	你好	Pinyin
wbig	大	Wubi
konnichiwa	こんにちは	Romaji
hello	hello	English
z + pinyin	Reverse lookup	When in Wubi

Who Is This For?

Multilingual Professionals

• Translators working across CJK languages
• Business people communicating with Chinese and Japanese partners
• Language teachers creating materials

Language Learners

• Chinese speakers learning Japanese
• Japanese speakers learning Chinese
• Anyone wanting translation hints while typing

Privacy-Conscious Users

• No cloud sync
• No keystroke logging
• Everything runs locally

Wubi Users

• Keep your muscle memory
• Add Pinyin fallback for rare characters
• Get translation lookups as bonus

The Philosophy

Your keyboard is a tool. It should adapt to you, not the other way around.

Switching input methods is a workaround for a limitation that shouldn't exist. If you think in multiple languages, you should type in multiple languages - fluidly, without friction.

RIME makes this possible. rime-snomiao is my configuration for it.

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Try It

Download: github.com/snomiao/rime-snomiao

Quick Install: npx rime-snomiao@latest

Community: Telegram @rime_snomiao

Star the repo if it helps you. And let me know what languages you'd like supported next.

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Snowstar Miao builds tools for polyglot productivity. CapsLockX for keyboard-first computing, rime-snomiao for multilingual typing.