duskmoon_code_engine

A pure Dart code editor engine for Flutter — a ground-up port of the CodeMirror 6 architecture. Zero external dependencies beyond Flutter.

Features

• Rope-based document model — efficient incremental text updates
• Immutable state system — EditorState, Transaction, Selection, Facet, Extension
• Incremental Lezer parser — LRParser, SyntaxNode, TreeCursor
• Tag-based syntax highlighting — Tag, HighlightStyle, TagStyle
• 19 language grammars — Dart, JavaScript, TypeScript, Python, HTML, CSS, JSON, Markdown, Rust, Go, YAML, C, C++, Elixir, Java, Kotlin, PHP, Ruby, Erlang, Swift, Zig
• Built-in commands — undo/redo, bracket matching, comment toggling, code folding, search & replace, clipboard
• Flutter widget — CodeEditorWidget with virtual scrolling, gutter, selection painting, cursor blinking, search panel

Getting Started

import 'package:duskmoon_code_engine/duskmoon_code_engine.dart';

CodeEditorWidget(
  initialCode: 'void main() => print("Hello!");',
  language: 'dart',
  theme: HighlightStyle.defaultStyle(),
);

Supported Languages

Dart, JavaScript, TypeScript, Python, HTML, CSS, JSON, Markdown, Rust, Go, YAML, C, C++, Elixir, Java, Kotlin, PHP, Ruby, Erlang, Swift, Zig.

License

MIT