feat(wip): Add support for C# documents

Currently, this only includes basic support for the TreeSitter grammar,
without support for symbols or LSP.

.gitmodules

@@ -32,3 +32,6 @@
 [submodule "3rdparty/photonwidgets"]
 	path = 3rdparty-kdab/photonwidgets
 	url = ssh://codereview.kdab.com:29418/photonwidgets
+[submodule "3rdparty/tree-sitter-c-sharp"]
+	path = 3rdparty/tree-sitter-c-sharp
+	url = https://github.com/tree-sitter/tree-sitter-c-sharp.git

3rdparty/CMakeLists.txt

@@ -99,3 +99,15 @@ target_link_libraries(${PROJECT_NAME} PRIVATE TreeSitter)
 # Always build tree-sitter with optimizations enabled. We shouldn't have to
 # debug it and it's performance critical.
 enable_optimizations(${PROJECT_NAME})
+
+# TreeSitterCSharp
+# ##############################################################################
+check_submodule(tree-sitter tree-sitter-c-sharp)
+project(TreeSitterCSharp LANGUAGES C)
+
+add_library(${PROJECT_NAME} STATIC tree-sitter-c-sharp/src/parser.c
+                                   tree-sitter-c-sharp/src/scanner.c)
+target_link_libraries(${PROJECT_NAME} PRIVATE TreeSitter)
+# Always build tree-sitter with optimizations enabled. We shouldn't have to
+# debug it and it's performance critical.
+enable_optimizations(${PROJECT_NAME})

src/core/CMakeLists.txt

@@ -25,6 +25,8 @@ set(PROJECT_SOURCES
     cppdocument.cpp
     cppdocument_p.h
     cppdocument_p.cpp
+    csharpdocument.h
+    csharpdocument.cpp
     functionsymbol.h
     functionsymbol.cpp
     dataexchange.h

src/core/core/settings.json

@@ -54,6 +54,7 @@
         "ico": "image_type",
         "slint": "slint_type",
         "qml": "qml_type",
+        "cs": "csharp_type",
         "ts": "qtts_type"
     },
     "text_editor": {

src/core/csharpdocument.cpp

@@ -0,0 +1,35 @@
+/*
+  This file is part of Knut.
+
+  SPDX-FileCopyrightText: 2025 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+
+  SPDX-License-Identifier: GPL-3.0-only
+
+  Contact KDAB at <[email protected]> for commercial licensing options.
+*/
+
+#include "csharpdocument.h"
+
+#include "codedocument_p.h"
+#include "symbol.h"
+
+namespace {
+QList<Core::Symbol *> queryAllSymbols(Core::CodeDocument *const document)
+{
+    Q_UNUSED(document);
+    // TODO
+    return {};
+}
+}
+
+namespace Core {
+
+CSharpDocument::CSharpDocument(QObject *parent)
+    : CodeDocument(Type::CSharp, parent)
+{
+    helper()->querySymbols = queryAllSymbols;
+}
+
+CSharpDocument::~CSharpDocument() = default;
+
+} // namespace Core

src/core/csharpdocument.h

@@ -0,0 +1,26 @@
+/*
+  This file is part of Knut.
+
+  SPDX-FileCopyrightText: 2025 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+
+  SPDX-License-Identifier: GPL-3.0-only
+
+  Contact KDAB at <[email protected]> for commercial licensing options.
+*/
+
+#pragma once
+
+#include "codedocument.h"
+
+namespace Core {
+
+class CSharpDocument : public CodeDocument
+{
+    Q_OBJECT
+
+public:
+    explicit CSharpDocument(QObject *parent = nullptr);
+    ~CSharpDocument() override;
+};
+
+}

src/core/document.h

@@ -36,6 +36,7 @@ class Document : public QObject
         Image,
         Slint,
         Qml,
+        CSharp,
         QtTs,
         Json,
     };
@@ -105,6 +106,7 @@ NLOHMANN_JSON_SERIALIZE_ENUM(Document::Type,
                               {Document::Type::Slint, "slint_type"},
                               {Document::Type::QtTs, "qtts_type"},
                               {Document::Type::Qml, "qml_type"},
+                              {Document::Type::CSharp, "csharp_type"},
                               {Document::Type::Json, "json_type"}})
 
 } // namespace Core

src/core/project.cpp

@@ -10,6 +10,7 @@
 
 #include "project.h"
 #include "cppdocument.h"
+#include "csharpdocument.h"
 #include "imagedocument.h"
 #include "jsondocument.h"
 #include "logger.h"
@@ -221,6 +222,8 @@ static Document *createDocument(const QString &suffix)
         return new QtTsDocument();
     case Document::Type::Qml:
         return new QmlDocument();
+    case Document::Type::CSharp:
+        return new CSharpDocument();
     case Document::Type::Json:
         return new JsonDocument();
     default:

src/gui/apiexecutorwidget.cpp

@@ -10,6 +10,7 @@
 
 #include "apiexecutorwidget.h"
 #include "core/cppdocument.h"
+#include "core/csharpdocument.h"
 #include "core/imagedocument.h"
 #include "core/jsondocument.h"
 #include "core/logger.h"
@@ -76,6 +77,8 @@ static const QMetaObject *metaObjectFromType(Core::Document::Type type)
         return &Core::QtTsDocument::staticMetaObject;
     case Core::Document::Type::Json:
         return &Core::JsonDocument::staticMetaObject;
+    case Core::Document::Type::CSharp:
+        return &Core::CSharpDocument::staticMetaObject;
     }
     Q_UNREACHABLE();
 }

src/gui/mainwindow.cpp

@@ -762,6 +762,7 @@ QWidget *MainWindow::widgetForDocument(Core::Document *document)
         tsView->setTsDocument(qobject_cast<Core::QtTsDocument *>(document));
         return tsView;
     }
+    case Core::Document::Type::CSharp:
     case Core::Document::Type::Cpp: {
         auto codeView = new CodeView();
         codeView->setDocument(qobject_cast<Core::CodeDocument *>(document));

src/treesitter/CMakeLists.txt

@@ -30,6 +30,7 @@ target_link_libraries(
   TreeSitter
   TreeSitterCpp
   TreeSitterQmlJs
+  TreeSitterCSharp
   kdalgorithms
   knut-utils
   Qt::Core)

src/treesitter/languages.h

@@ -15,4 +15,5 @@ struct TSLanguage;
 extern "C" {
 TSLanguage *tree_sitter_cpp();
 TSLanguage *tree_sitter_qmljs();
+TSLanguage *tree_sitter_c_sharp();
 }

src/treesitter/parser.cpp

@@ -75,6 +75,8 @@ TSLanguage *Parser::getLanguage(Core::Document::Type type)
         return tree_sitter_qmljs();
     case Core::Document::Type::Cpp:
         return tree_sitter_cpp();
+    case Core::Document::Type::CSharp:
+        return tree_sitter_c_sharp();
     default:
         Q_UNREACHABLE();
     }