SweetLine 1.2.1

SweetLine for .NET

SweetLine is a high-performance syntax highlighting and code structure analysis engine. This package provides the .NET / C# binding over the SweetLine native core via P/Invoke.

Features

• Full-text highlighting with TextAnalyzer.AnalyzeText(...)
• Single-line highlighting with TextAnalyzer.AnalyzeLine(...)
• Managed-document incremental highlighting with DocumentAnalyzer
• Visible-range slice update with DocumentAnalyzer.AnalyzeIncrementalInLineRange(...)
• Visible-range cached slice read with DocumentAnalyzer.GetHighlightSlice(...)
• Scope and indent guide analysis with AnalyzeIndentGuides(...)
• Preprocessor macro support with DefineMacro(...) / UndefineMacro(...)
• Style-ID mode and inline-style mode through HighlightConfig
• Syntax loading from JSON string or file, plus file-extension lookup

Install

dotnet add package SweetLine

Syntax Rules

Built-in syntax rule JSON files are not embedded in the NuGet package. Download the language rules you need from the repository syntaxes/ directory:

• syntaxes/

Then place the selected JSON files in your application resources or deployment directory and load them with CompileSyntaxFromFile(...).

Quick Start

using SweetLine;

var config = new HighlightConfig(ShowIndex: true, InlineStyle: false);
using var engine = new HighlightEngine(config);

engine.RegisterStyleName("keyword", 1);
engine.RegisterStyleName("string", 2);
engine.RegisterStyleName("comment", 3);

// Syntax JSON files are not included in the NuGet package.
// Download them from https://github.com/FinalScave/SweetLine/tree/main/syntaxes
engine.CompileSyntaxFromFile("syntaxes/csharp.json");
// or: engine.CompileSyntaxFromJson(jsonString);

TextAnalyzer? textAnalyzer = engine.CreateAnalyzerByName("csharp");
if (textAnalyzer is not null)
{
    DocumentHighlight result = textAnalyzer.AnalyzeText("public class Demo {}");
    IndentGuideResult guides = textAnalyzer.AnalyzeIndentGuides("public class Demo {}");
}

Managed Document and Incremental Updates

using var document = new Document("file:///example.cs", sourceText);
DocumentAnalyzer? analyzer = engine.LoadDocument(document);

if (analyzer is not null)
{
    DocumentHighlight initial = analyzer.Analyze();

    var editRange = new TextRange(
        new TextPosition(Line: 2, Column: 4),
        new TextPosition(Line: 2, Column: 8));

    DocumentHighlight updated = analyzer.AnalyzeIncremental(editRange, "newText");

    // Read the current visible window from the latest cached highlight result
    DocumentHighlightSlice visible = analyzer.GetHighlightSlice(
        new LineRange(StartLine: 0, LineCount: 80));

    // Or apply a patch and return only the requested slice in one call
    DocumentHighlightSlice updatedVisible = analyzer.AnalyzeIncrementalInLineRange(
        editRange,
        "newText",
        new LineRange(StartLine: 0, LineCount: 80));

    IndentGuideResult guides = analyzer.AnalyzeIndentGuides();
}

Use GetHighlightSlice(...) after Analyze() or AnalyzeIncremental(...) when the editor only needs the current viewport. Use AnalyzeIncrementalInLineRange(...) when you want to apply the edit and fetch the visible slice in one step.

Single-Line Analysis

var lineInfo = new TextLineInfo(Line: 0, StartState: 0, StartCharOffset: 0);
LineAnalyzeResult lineResult = textAnalyzer!.AnalyzeLine("int x = 42;", lineInfo);

// lineResult.Highlight   token spans for this line
// lineResult.EndState    pass into the next line's StartState
// lineResult.CharCount   characters consumed

Output Models

Native Library

This package bundles:

• runtimes/win-x64/native/sweetline.dll
• runtimes/linux-x64/native/libsweetline.so
• runtimes/linux-arm64/native/libsweetline.so
• runtimes/osx-x64/native/libsweetline.dylib
• runtimes/osx-arm64/native/libsweetline.dylib

Native resolver search order:

1. SWEETLINE_LIB_PATH environment variable, either a file path or a directory
2. App base directory / current directory
3. runtimes/{rid}/native/ folders and common build output directories
4. System default loader

Override example:

$env:SWEETLINE_LIB_PATH = "C:\path\to\native"

Requirements

• .NET 8.0 or newer
• Windows x64, Linux x64/arm64, or macOS x64/arm64 for bundled native binaries

Pack and Publish

Build or sync the native libraries under prebuilt/windows/x64, prebuilt/linux/x86_64, prebuilt/linux/aarch64, prebuilt/osx/x86_64, and prebuilt/osx/arm64 first.

dotnet pack platform/CSharp/SweetLine/SweetLine.csproj -c Release -o artifacts/nuget /p:PackageVersion=1.2.0

dotnet nuget push artifacts/nuget/SweetLine.1.2.0.nupkg \
  --api-key $NUGET_API_KEY \
  --source https://api.nuget.org/v3/index.json \
  --skip-duplicate

Links

• Repository: FinalScave/SweetLine
• .NET API docs: docs/en/api_dotnet.md
• General docs: docs