C# syntax highlighting

Since: Unreleased

GameEventScript.SyntaxHighlighter is an optional .NET Standard 2.1 library for GES/GESA editors and terminals. It uses BCL Regex, with no third-party, Compiler, Runtime or UI dependency. It shares the canonical TextMate rules with the CLI and the Swift product.

using GameEventScript.SyntaxHighlighter;

var highlighter = new GameEventScriptSyntaxHighlighter(); // GES by default
var result = highlighter.Highlight(source);
if (result.IsComplete)
{
    foreach (var span in result.Spans)
    {
        // UTF-16 offsets; map Kind or the TextMate Scopes to your editor's theme.
        ApplyStyle(span.Start, span.Length, span.Kind);
    }
}

Reuse the highlighter. For incremental editing use HighlightLine(line, previousState) with the original line terminator. Cache each line’s text, spans and NextState; after edits, reprocess until unchanged text and state converge. Add the document line offset when applying spans. Incomplete results have no spans or state: render plain text and do not cache that state.

var highlighter = new GameEventScriptSyntaxHighlighter(GameEventScriptSyntaxLanguage.Gesa);
var result = highlighter.Highlight(dump);
var displayed = result.IsComplete
    ? GameEventScriptAnsiRenderer.Render(dump, result.Spans)
    : dump;

The ANSI renderer accepts an optional category-to-SGR-color callback. Terminal capabilities, NO_COLOR, redirection and color enablement remain caller decisions.

Run dotnet test implementation/csharp/GameEventScript.SyntaxHighlighter/tests. C# and Swift execute the same Markdown cases. See the contract for ranges, categories, limits, incremental states and supported TextMate features. The NuGet package is available from the next release; a source checkout can reference the project now.