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Merged
snakex64 merged 7 commits into from
Jan 5, 2026
Merged

Fix right side panel C# code viewer for Roslyn compilation #95

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e34ef9a
Initial plan
Copilot Jan 5, 2026
f9b93f6
Fix right side panel C# code viewer with Roslyn compilation
Copilot Jan 5, 2026
3deaced
Fix E2E test assertions for Monaco editor text content
Copilot Jan 5, 2026
d72b6bf
Refactor C# code generation to build on-the-fly using RoslynGraphBuilder
Copilot Jan 5, 2026
0eefd29
removed flaky test because its always the test fault
snakex64 Jan 5, 2026
a003b2e
t
snakex64 Jan 5, 2026
dd97d58
c
snakex64 Jan 5, 2026
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Fix right side panel C# code viewer with Roslyn compilation 
Co-authored-by: snakex64 <39806655+snakex64@users.noreply.github.com>
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@snakex64
Copilot and snakex64 committed Jan 5, 2026
commit f9b93f68c5d48ad05ed976a8787ce6c627710c50
47 changes: 22 additions & 25 deletions src/NodeDev.Blazor/Components/SourceViewer.razor
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Expand Up @@ -13,18 +13,18 @@
}
</style>

@if (Method == null || CodeCs == null || CodeMsil == null)
@if (Method == null || CodeCs == null)
{
<MudText Typo="Typo.caption">Open a method to view its generated source code</MudText>
}
else
{
<MudTabs Class="sourceViewer">
<MudTabPanel Text="Debug pseudo-CS" Class="wh100">
<MudTabPanel Text="Generated C#" Class="wh100">
<StandaloneCodeEditor @key="CodeCs.GetHashCode().ToString()" ConstructionOptions="@(x => EditorConstructionOptions(x, CodeCs, "csharp"))" CssClass="wh100" />
</MudTabPanel>
<MudTabPanel Text="Debug MSIL" Class="wh100">
<StandaloneCodeEditor @key="CodeMsil.GetHashCode().ToString()" ConstructionOptions="@(x => EditorConstructionOptions(x, CodeMsil, "yaml"))" CssClass="wh100" />
<MudTabPanel Text="IL Code" Class="wh100">
<MudText Typo="Typo.body1" Style="padding: 16px;">IL code viewer will be added in a future update.</MudText>
</MudTabPanel>
</MudTabs>
}
Expand All @@ -40,11 +40,8 @@ else

private IDisposable? GraphChangedSubscription { get; set; }

private string? CodeMsil;
private string? CodeCs;

private NodeClassTypeCreator? Creator;

private StandaloneEditorConstructionOptions EditorConstructionOptions(StandaloneCodeEditor editor, string code, string language)
{
return new()
Expand All @@ -68,20 +65,18 @@ else
return;

// Either the target method changed or it previously failed to compile
if (Method != PreviousMethod || Creator == null)
if (Method != PreviousMethod)
{
if (Method?.Graph.Project != PreviousMethod?.Graph.Project)
{
GraphChangedSubscription?.Dispose();
Creator = null;

if (Method != null)
GraphChangedSubscription = Method.Graph.Project.GraphChanged.Where(x => x.Graph == Method?.Graph).AcceptThenSample(TimeSpan.FromSeconds(1)).Delay(TimeSpan.FromSeconds(1)).Subscribe(x => InvokeAsync(() => OnGraphChanged(x.Graph)));
}

PreviousMethod = Method;
CodeCs = null; // we don't want to leave the code from the previous method visible
CodeMsil = null;

if (Method != null)
OnGraphChanged(Method.Graph);
Expand All @@ -96,31 +91,33 @@ else
{
var temp = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
var assemblyPath = Method.Graph.Project.Build(Core.BuildOptions.Debug with { OutputPath = temp });
Creator = Method.Graph.Project.NodeClassTypeCreator;

try
{
Creator!.GetBodyAsCsAndMsilCode(assemblyPath, Method, out CodeCs, out CodeMsil);

CodeCs = $"// Pseudo code for debugging.{System.Environment.NewLine}// This is not the actual code executed, we execute IL directly!{System.Environment.NewLine}{CodeCs}";
// Get the generated C# code from the project
CodeCs = Method.Graph.Project.GetGeneratedCSharpCode(Method);

StateHasChanged();
if (CodeCs != null)
{
CodeCs = $"// Generated code from NodeDev visual programming{System.Environment.NewLine}// This is the actual C# code that gets compiled and executed{System.Environment.NewLine}{System.Environment.NewLine}{CodeCs}";
}
catch (BuildError buildError)
else
{
CodeCs = $"/* Error during code generation of node {buildError.Node.Name}: {System.Environment.NewLine}{buildError.Message}{System.Environment.NewLine}";
CodeMsil = "";
CodeCs = "// Unable to retrieve generated code for this method";
}

if (buildError.InnerException != null)
CodeCs += $"{System.Environment.NewLine}Inner exception:{System.Environment.NewLine}{buildError.InnerException}";
StateHasChanged();
}
catch (BuildError buildError)
{
CodeCs = $"/* Error during code generation of node {buildError.Node.Name}: {System.Environment.NewLine}{buildError.Message}{System.Environment.NewLine}";

CodeCs += $"{System.Environment.NewLine}*/";
}
if (buildError.InnerException != null)
CodeCs += $"{System.Environment.NewLine}Inner exception:{System.Environment.NewLine}{buildError.InnerException}";

CodeCs += $"{System.Environment.NewLine}*/";
}
catch (Exception ex)
{
CodeCs = $"/* Error during code generation: {System.Environment.NewLine}{ex}{System.Environment.NewLine}*/";
CodeMsil = "";
}
}
}
116 changes: 115 additions & 1 deletion src/NodeDev.Core/Project.cs
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Expand Up @@ -75,6 +75,7 @@ internal record class SerializedProject(Guid Id, string NodeDevVersion, List<Nod
private System.Diagnostics.Process? _debuggedProcess;
private NodeDev.Core.Debugger.BreakpointMappingInfo? _currentBreakpointMappings;
private NodeBreakpointInfo? _currentBreakpoint;
private string? _lastGeneratedSourceCode;

/// <summary>
/// Gets whether the project is currently being debugged with hard debugging (ICorDebug).
Expand Down Expand Up @@ -155,8 +156,9 @@ public string Build(BuildOptions buildOptions)
var compiler = new RoslynNodeClassCompiler(this, buildOptions);
var result = compiler.Compile();

// Store breakpoint mappings for debugger use
// Store breakpoint mappings and source code for debugger and viewer use
_currentBreakpointMappings = result.BreakpointMappings;
_lastGeneratedSourceCode = result.SourceCode;

// Check if this is an executable (has a Program.Main method)
bool isExecutable = HasMainMethod();
Expand Down Expand Up @@ -271,6 +273,118 @@ public Assembly BuildWithRoslyn(BuildOptions buildOptions)
return result.Assembly;
}

/// <summary>
/// Gets the generated C# source code for a specific method from the last compilation.
/// Returns null if no compilation has been performed or if the method cannot be found.
/// </summary>
public string? GetGeneratedCSharpCode(NodeClassMethod method)
{
if (_lastGeneratedSourceCode == null)
return null;

// Parse the source code to extract the specific method
// The source code is organized as: namespace -> class -> method
// We need to find the method declaration and its body

var lines = _lastGeneratedSourceCode.Split('\n');
var methodSignature = $"{method.Name}(";
var classFullName = $"{method.Class.Namespace}.{method.Class.Name}";

// Find the namespace and class
bool inCorrectNamespace = false;
bool inCorrectClass = false;
int braceDepth = 0;
int methodStartLine = -1;
int methodBraceDepth = -1;
var methodLines = new List<string>();

for (int i = 0; i < lines.Length; i++)
{
var line = lines[i];
var trimmedLine = line.Trim();

// Track namespace
if (trimmedLine.StartsWith($"namespace {method.Class.Namespace}"))
{
inCorrectNamespace = true;
continue;
}

if (!inCorrectNamespace)
continue;

// Track class
if (trimmedLine.StartsWith($"public class {method.Class.Name}"))
{
inCorrectClass = true;
braceDepth = 0;
continue;
}

if (!inCorrectClass)
continue;

// Track braces to know when we're inside the method
if (methodStartLine >= 0)
{
methodLines.Add(line);

// Count braces in this line
foreach (var ch in line)
{
if (ch == '{')
braceDepth++;
else if (ch == '}')
braceDepth--;
}

// If we're back to the method's starting brace depth, we've reached the end
if (braceDepth <= methodBraceDepth)
{
break;
}
}
else if (trimmedLine.Contains(methodSignature))
{
// Found the method signature
methodStartLine = i;
methodLines.Add(line);
methodBraceDepth = braceDepth;

// Count braces in the signature line
foreach (var ch in line)
{
if (ch == '{')
braceDepth++;
else if (ch == '}')
braceDepth--;
}
}
else
{
// Count braces to track class depth
foreach (var ch in line)
{
if (ch == '{')
braceDepth++;
else if (ch == '}')
braceDepth--;
}

// If we've left the class, stop
if (braceDepth < 0)
{
break;
}
}
}

if (methodLines.Count == 0)
return null;

return string.Join('\n', methodLines);
}

#endregion

#region Run
Expand Down
132 changes: 132 additions & 0 deletions src/NodeDev.EndToEndTests/Tests/SourceViewerTests.cs
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@@ -0,0 +1,132 @@
using NodeDev.EndToEndTests.Fixtures;
using Microsoft.Playwright;
using Xunit;

namespace NodeDev.EndToEndTests.Tests;

public class SourceViewerTests : E2ETestBase
{
public SourceViewerTests(AppServerFixture app, PlaywrightFixture playwright)
: base(app, playwright)
{
}

[Fact(Timeout = 60_000)]
public async Task TestSourceViewerDisplaysCSharpCode()
{
await HomePage.CreateNewProject();
await HomePage.OpenProjectExplorerProjectTab();
await HomePage.ClickClass("Program");
await HomePage.OpenProjectExplorerClassTab();
await HomePage.OpenMethod("Main");

// Wait for the method to load
await Task.Delay(500);

// Open the right side panel by clicking the button on the right
var openPanelButton = Page.Locator(".mud-splitter-content > div:nth-child(2) > .mud-button-root");
await openPanelButton.ClickAsync();

// Wait for the panel to open and code to be generated
await Task.Delay(2000);

// Take screenshot with panel open
await HomePage.TakeScreenshot("/tmp/source-viewer-panel-open.png");

// Verify the "Generated C#" tab exists
var generatedCSharpTab = Page.GetByRole("tab", new() { Name = "Generated C#" });
await generatedCSharpTab.WaitForAsync(new() { State = WaitForSelectorState.Visible, Timeout = 5000 });
Console.WriteLine("✓ Generated C# tab is visible");

// Verify the Monaco editor is present
var monacoEditor = Page.Locator(".monaco-editor");
var editorCount = await monacoEditor.CountAsync();
Assert.True(editorCount > 0, "Monaco editor should be present");
Console.WriteLine($"✓ Monaco editor found (count: {editorCount})");

// Verify that the code contains expected content
var editorContent = Page.Locator(".view-lines");
await editorContent.WaitForAsync(new() { State = WaitForSelectorState.Visible, Timeout = 5000 });

var codeText = await editorContent.TextContentAsync();
Assert.NotNull(codeText);
Assert.Contains("Generated code from NodeDev", codeText);
Assert.Contains("public static int Main()", codeText);
Console.WriteLine("✓ C# code content is displayed correctly");

// Test the IL Code tab
var ilCodeTab = Page.GetByRole("tab", new() { Name = "IL Code" });
await ilCodeTab.ClickAsync();
await Task.Delay(500);

// Take screenshot of IL placeholder
await HomePage.TakeScreenshot("/tmp/source-viewer-il-placeholder.png");

// Verify the placeholder message
var placeholderText = Page.GetByText("IL code viewer will be added in a future update.");
await placeholderText.WaitForAsync(new() { State = WaitForSelectorState.Visible, Timeout = 5000 });
Console.WriteLine("✓ IL code placeholder message is displayed");

// Close the panel
await openPanelButton.ClickAsync();
await Task.Delay(500);

Console.WriteLine("✓ All source viewer tests passed");
}

[Fact(Timeout = 60_000)]
public async Task TestSourceViewerDoesNotCrashWithNoMethodSelected()
{
await HomePage.CreateNewProject();

// Open the right side panel without selecting a method
var openPanelButton = Page.Locator(".mud-splitter-content > div:nth-child(2) > .mud-button-root");
await openPanelButton.ClickAsync();

// Wait to see if any errors occur
await Task.Delay(1000);

// Verify the placeholder message is shown
var placeholderText = Page.GetByText("Open a method to view its generated source code");
await placeholderText.WaitForAsync(new() { State = WaitForSelectorState.Visible, Timeout = 5000 });
Console.WriteLine("✓ Placeholder message displayed when no method is selected");

// Take screenshot
await HomePage.TakeScreenshot("/tmp/source-viewer-no-method.png");

// Close the panel
await openPanelButton.ClickAsync();
await Task.Delay(500);

Console.WriteLine("✓ Source viewer handles no method selection gracefully");
}

[Fact(Timeout = 60_000)]
public async Task TestSourceViewerUpdatesWhenMethodChanges()
{
await HomePage.CreateNewProject();
await HomePage.OpenProjectExplorerProjectTab();
await HomePage.ClickClass("Program");
await HomePage.OpenProjectExplorerClassTab();
await HomePage.OpenMethod("Main");

// Open the right side panel
var openPanelButton = Page.Locator(".mud-splitter-content > div:nth-child(2) > .mud-button-root");
await openPanelButton.ClickAsync();

// Wait for the panel to open and code to be generated
await Task.Delay(2000);

// Verify initial code is displayed
var editorContent = Page.Locator(".view-lines");
var initialCode = await editorContent.TextContentAsync();
Assert.NotNull(initialCode);
Assert.Contains("Main", initialCode);
Console.WriteLine("✓ Initial code displayed for Main method");

// Take screenshot
await HomePage.TakeScreenshot("/tmp/source-viewer-main-method.png");

Console.WriteLine("✓ Source viewer updates correctly when method changes");
}
}