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SweetEditor

Cross-Platform Code Editor Core (C++17)

A C++17 core with platform-native rendering, built for long-term editor infrastructure in IDEs, AI programming tools, cloud development workspaces, and similar products.

Android / iOS / macOS / Windows / Swing / OHOS / Web*

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This repository is an unofficial fork maintained by LangLang03, and is not the official OpenSweetEditor repository.

Official upstream repository: FinalScave/OpenSweetEditor

Project Positioning

SweetEditor is a cross-platform code editor core designed for products that need consistent editing behavior across Android, iOS, macOS, Windows, Swing, and OHOS.

It adopts a "C++17 core + platform-native rendering" architecture: the C++ core is responsible for document editing semantics, text layout, and the decoration model, while each platform layer handles input forwarding and rendering.

It is suited for long-term editor infrastructure in IDEs, AI programming tools, cloud development workspaces, and similar products.

Core Features

• One unified core, reused across platforms: capabilities such as highlighting, folding, Inlay Hints, Ghost Text, and structural guides are all generated by a single C++ core
• Separation of core and rendering: platform layers focus on input bridging and native drawing, reducing regression risk and maintenance cost across platforms
• Comprehensive advanced editing capabilities: supports code folding, snippets, linked editing, diagnostic decorations, completion extensions, and more
• A clear performance path: built on Piece Table, incremental layout, viewport rendering, SIMD Unicode acceleration, and mmap-based large-file loading
• Friendly native integration: already adapted for Android, Apple platforms, Windows, Swing, and OHOS, with Web support currently in testing through an unofficial fork

Platform Support Status

Platform	Status	Rendering Technology	UI Framework	Implementation
Android	Implemented	Canvas + Paint	Android View	./platform/Android
iOS	Implemented	CoreText + CoreGraphics	UIKit / SwiftUI (being refined)	./platform/Apple
macOS	Implemented	CoreText + CoreGraphics	AppKit / SwiftUI (being refined)	./platform/Apple
Windows	Implemented	GDI+	WinForms	./platform/WinForms
Swing	Implemented	Java2D	Swing	./platform/Swing
OHOS	Implemented	ArkUI Canvas	ArkUI	./platform/OHOS
Flutter	Implemented	TextPainter	Flutter	./platform/Flutter
Qt	Implemented	QPainter	Qt	FinalScave/SweetEditor-Qt
Compose Multiplatform	In Progress	Compose Canvas	Compose	lumkit/SweetEditor-Compose
Web	Testing (Unofficial)	-	-	LangLang03/OpenSweetEditor-Web
C# Avalonia UI	Planned	-	-	-
C# WinUI	Planned	-	-	-

Overall Architecture

+-----------------------------------------------------------------------------------+
|                          Platform Layer (Input + Render)                          |
|                                                                                   |
| Android        Apple         Swing / WinForms      OHOS            Web*           |
| Canvas         CoreText/CG   Java2D / GDI+         ArkUI Canvas    Testing        |
+----------------+-------------+----------------------+---------------+--------------+
         |               |                 |                    |
         | JNI direct    | manual C bridge | C API / payload    | NAPI direct
         v               v                 v                    v
+----------------+ +----------------+ +------------------+ +-------------------+
| JNI Bridge     | | Apple Bridge   | | C API Bridge     | | OHOS NAPI Bridge |
| jni_entry      | | Swift + C      | | extern "C"       | | ArkTS + NAPI     |
+----------------+ +----------------+ +------------------+ +-------------------+
          \               |                 |                    /
           \              |                 |                   /
            +-------------+-----------------+------------------+
                                  |
                                  v
               +--------------------------------------------------+
               |             SweetEditor Core (C++17)             |
               | Document / TextLayout / DecorationManager /      |
               | EditorCore / GestureHandler / UndoManager /      |
               | LinkedEditing                                    |
               +--------------------------------------------------+

For the full architecture documentation, see Architecture

Core Capabilities

The C++ core covers document editing (Piece Table, undo/redo, large-file loading), text layout (word wrapping, incremental layout, viewport clipping), styling and decorations (syntax/semantic highlighting, Inlay Hints, Ghost Text, diagnostics, structural guides), advanced editing (code folding, snippets, linked editing), and platform extension mechanisms (DecorationProvider, CompletionProvider). Performance is built on SIMD Unicode transcoding, measurement caching, and viewport-level rendering.

For the complete capability list, see EditorCore API.

Quick Start

Build

git clone https://github.com/LangLang03/OpenSweetEditor-Web.git
cd OpenSweetEditor
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release
cmake --build . -j

For platform quick-start guides and WebAssembly testing builds, see the Platform API Index.

Minimal Integration Example

SweetEditor editor = new SweetEditor(context);
editor.applyTheme(EditorTheme.dark());
editor.loadDocument(new Document("Hello, SweetEditor!"));

For more examples, see the platform API documentation.

Platform Demo Screenshots

Android	macOS
Windows (WinForms)	Swing

The original Android screenshot has a relatively low resolution, so it is displayed here at a smaller width.

Dependencies

SweetEditor follows a minimal-dependency principle. The core runtime depends only on a small set of lightweight libraries:

• simdutf: SIMD-accelerated Unicode encoding and decoding
• nlohmann/json: JSON debug export and internal helper structures
• utfcpp: UTF-8 iteration and validation

Testing uses Catch2.

Documentation

Document	Description
Architecture	Core architecture, module design, data flow, and rendering pipeline
EditorCore API	Reference for the C++ core layer and C API
Platform API Index	Entry point for Android, Swing, Apple, WinForms, and OHOS platform API docs
Platform Implementation Standard	Required types, module structure, API contracts, and compliance rules for all platform implementations
Web Platform API (Guide)	Web SDK v2 usage guide, build flow, runtime bundling, and CDN integration
Web SDK v2 Full API Reference	100% declaration coverage for @sweeteditor/sdk, @sweeteditor/core, @sweeteditor/widget, and @sweeteditor/providers-sweetline
Contributing	Repository structure, reading entry points, and platform synchronization checkpoints

Contributing

SweetEditor is building an open ecosystem for cross-platform editor infrastructure, and contributions are welcome.

See Contributing Guide for details.

Community

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QQ QQ Group ID: 1090609035

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License

SweetEditor is licensed under the GNU Lesser General Public License v2.1 or later (LGPL-2.1+), with an additional Static Linking Exception provided as a supplementary clarification.

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