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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Documents;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Classification;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.EmbeddedLanguages.Common;
using Microsoft.CodeAnalysis.EmbeddedLanguages.StackFrame;
using Microsoft.CodeAnalysis.ErrorReporting;
using Microsoft.CodeAnalysis.FindUsages;
using Microsoft.CodeAnalysis.Navigation;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.StackTraceExplorer;
using Microsoft.VisualStudio.Text.Classification;
using Roslyn.Utilities;
namespace Microsoft.VisualStudio.LanguageServices.StackTraceExplorer
{
using StackFrameToken = EmbeddedSyntaxToken<StackFrameKind>;
using StackFrameTrivia = EmbeddedSyntaxTrivia<StackFrameKind>;
internal class StackFrameViewModel : FrameViewModel
{
private readonly ParsedStackFrame _frame;
private readonly IThreadingContext _threadingContext;
private readonly Workspace _workspace;
private readonly IStackTraceExplorerService _stackExplorerService;
private readonly Dictionary<StackFrameSymbolPart, DefinitionItem?> _definitionCache = new();
private Document? _cachedDocument;
private int _cachedLineNumber;
public StackFrameViewModel(
ParsedStackFrame frame,
IThreadingContext threadingContext,
Workspace workspace,
IClassificationFormatMap formatMap,
ClassificationTypeMap typeMap)
: base(formatMap, typeMap)
{
_frame = frame;
_threadingContext = threadingContext;
_workspace = workspace;
_stackExplorerService = workspace.Services.GetRequiredService<IStackTraceExplorerService>();
}
public override bool ShowMouseOver => true;
public void NavigateToClass()
{
var cancellationToken = _threadingContext.DisposalToken;
Task.Run(() => NavigateToClassAsync(cancellationToken), cancellationToken).ReportNonFatalErrorAsync();
}
public async Task NavigateToClassAsync(CancellationToken cancellationToken)
{
try
{
var definition = await GetDefinitionAsync(StackFrameSymbolPart.ContainingType, cancellationToken).ConfigureAwait(false);
await NavigateToDefinitionAsync(definition, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex) when (FatalError.ReportAndCatchUnlessCanceled(ex, cancellationToken))
{
}
}
private async Task NavigateToDefinitionAsync(DefinitionItem? definition, CancellationToken cancellationToken)
{
if (definition is null)
return;
var location = await definition.GetNavigableLocationAsync(
_workspace, cancellationToken).ConfigureAwait(false);
await location.TryNavigateToAsync(
_threadingContext, new NavigationOptions(PreferProvisionalTab: true, ActivateTab: false), cancellationToken).ConfigureAwait(false);
}
public void NavigateToSymbol()
{
var cancellationToken = _threadingContext.DisposalToken;
Task.Run(() => NavigateToMethodAsync(cancellationToken), cancellationToken).ReportNonFatalErrorAsync();
}
public async Task NavigateToMethodAsync(CancellationToken cancellationToken)
{
try
{
var definition = await GetDefinitionAsync(StackFrameSymbolPart.Method, cancellationToken).ConfigureAwait(false);
await NavigateToDefinitionAsync(definition, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex) when (FatalError.ReportAndCatchUnlessCanceled(ex, cancellationToken))
{
}
}
public void NavigateToFile()
{
var cancellationToken = _threadingContext.DisposalToken;
Task.Run(() => NavigateToFileAsync(cancellationToken), cancellationToken).ReportNonFatalErrorAsync();
}
public async Task NavigateToFileAsync(CancellationToken cancellationToken)
{
try
{
var (document, lineNumber) = GetDocumentAndLine();
if (document is not null)
{
// While navigating do not activate the tab, which will change focus from the tool window
var options = new NavigationOptions(PreferProvisionalTab: true, ActivateTab: false);
var sourceText = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
// If the line number is larger than the total lines in the file
// then just go to the end of the file (lines count). This can happen
// if the file changed between the stack trace being looked at and the current
// version of the file.
lineNumber = Math.Min(sourceText.Lines.Count, lineNumber);
var navigationService = _workspace.Services.GetService<IDocumentNavigationService>();
if (navigationService is null)
return;
var location = await navigationService.TryNavigateToLineAndOffsetAsync(
_threadingContext, _workspace, document.Id, lineNumber - 1, offset: 0, options, cancellationToken).ConfigureAwait(false);
}
}
catch (Exception ex) when (FatalError.ReportAndCatchUnlessCanceled(ex, cancellationToken))
{
}
}
protected override IEnumerable<Inline> CreateInlines()
{
var methodDeclaration = _frame.Root.MethodDeclaration;
var tree = _frame.Tree;
var className = methodDeclaration.MemberAccessExpression.Left;
var classLeadingTrivia = GetLeadingTrivia(className);
yield return MakeClassifiedRun(ClassificationTypeNames.Text, CreateString(classLeadingTrivia));
//
// Build the link to the class
//
var classLink = new Hyperlink();
var classLinkText = className.ToString();
classLink.Inlines.Add(MakeClassifiedRun(ClassificationTypeNames.ClassName, classLinkText));
classLink.Click += (s, a) => NavigateToClass();
classLink.RequestNavigate += (s, a) => NavigateToClass();
yield return classLink;
// Since we're only using the left side of a qualified name, we expect
// there to be no trivia on the right (trailing).
Debug.Assert(GetTrailingTrivia(className).IsEmpty);
//
// Build the link to the method
//
var methodLink = new Hyperlink();
var methodTextBuilder = new StringBuilder();
methodTextBuilder.Append(methodDeclaration.MemberAccessExpression.DotToken.ToFullString());
methodTextBuilder.Append(methodDeclaration.MemberAccessExpression.Right.ToFullString());
if (methodDeclaration.TypeArguments is not null)
{
methodTextBuilder.Append(methodDeclaration.TypeArguments.ToFullString());
}
methodTextBuilder.Append(methodDeclaration.ArgumentList.ToFullString());
methodLink.Inlines.Add(MakeClassifiedRun(ClassificationTypeNames.MethodName, methodTextBuilder.ToString()));
methodLink.Click += (s, a) => NavigateToSymbol();
methodLink.RequestNavigate += (s, a) => NavigateToSymbol();
yield return methodLink;
//
// If there is file information build a link to that
//
if (_frame.Root.FileInformationExpression is not null)
{
var fileInformation = _frame.Root.FileInformationExpression;
var leadingTrivia = GetLeadingTrivia(fileInformation);
yield return MakeClassifiedRun(ClassificationTypeNames.Text, CreateString(leadingTrivia));
var fileLink = new Hyperlink();
var fileLinkText = _frame.Root.FileInformationExpression.ToString();
fileLink.Inlines.Add(MakeClassifiedRun(ClassificationTypeNames.Text, fileInformation.ToString()));
fileLink.Click += (s, a) => NavigateToFile();
fileLink.RequestNavigate += (s, a) => NavigateToFile();
yield return fileLink;
var trailingTrivia = GetTrailingTrivia(fileInformation);
yield return MakeClassifiedRun(ClassificationTypeNames.Text, CreateString(trailingTrivia));
}
//
// Don't lose the trailing trivia text
//
yield return MakeClassifiedRun(ClassificationTypeNames.Text, _frame.Root.EndOfLineToken.ToFullString());
}
private (Document? document, int lineNumber) GetDocumentAndLine()
{
if (_cachedDocument is not null)
{
return (_cachedDocument, _cachedLineNumber);
}
(_cachedDocument, _cachedLineNumber) = _stackExplorerService.GetDocumentAndLine(_workspace.CurrentSolution, _frame);
return (_cachedDocument, _cachedLineNumber);
}
private async Task<DefinitionItem?> GetDefinitionAsync(StackFrameSymbolPart symbolPart, CancellationToken cancellationToken)
{
if (_definitionCache.TryGetValue(symbolPart, out var definition) && definition is not null)
{
return definition;
}
_definitionCache[symbolPart] = await _stackExplorerService.TryFindDefinitionAsync(_workspace.CurrentSolution, _frame, symbolPart, cancellationToken).ConfigureAwait(false);
return _definitionCache[symbolPart];
}
private static ImmutableArray<StackFrameTrivia> GetLeadingTrivia(StackFrameNode node)
{
if (node.ChildCount == 0)
{
return ImmutableArray<StackFrameTrivia>.Empty;
}
var child = node[0];
if (child.IsNode)
{
return GetLeadingTrivia(child.Node);
}
return child.Token.LeadingTrivia;
}
private static ImmutableArray<StackFrameTrivia> GetTrailingTrivia(StackFrameNode node)
{
if (node.ChildCount == 0)
{
return ImmutableArray<StackFrameTrivia>.Empty;
}
var child = node[^1];
if (child.IsNode)
{
return GetTrailingTrivia(child.Node);
}
return child.Token.TrailingTrivia;
}
/// <summary>
/// Depth first traversal of the descendents of a node to the tokens
/// </summary>
private static void GetLeafTokens(StackFrameNode node, ArrayBuilder<StackFrameToken> builder)
{
foreach (var child in node)
{
if (child.IsNode)
{
GetLeafTokens(child.Node, builder);
}
else
{
builder.Add(child.Token);
}
}
}
private static string CreateString(ImmutableArray<StackFrameTrivia> triviaList)
{
using var _ = PooledStringBuilder.GetInstance(out var sb);
foreach (var trivia in triviaList)
{
sb.Append(trivia.ToString());
}
return sb.ToString();
}
}
}
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