private static void AnalyzeSwitchStatement(SyntaxNodeAnalysisContext context)
{
var switchStatement = (SwitchStatementSyntax)context.Node;
SyntaxList <SwitchSectionSyntax> sections = switchStatement.Sections;
if (!sections.Any())
{
return;
}
ExpressionSyntax switchExpression = switchStatement.Expression;
SingleLocalDeclarationStatementInfo localInfo = default;
string name = GetName();
if (name == null)
{
return;
}
ITypeSymbol kindSymbol = context.SemanticModel.GetTypeSymbol(switchExpression, context.CancellationToken);
if (kindSymbol?.HasMetadataName(CSharpMetadataNames.Microsoft_CodeAnalysis_CSharp_SyntaxKind) != true)
{
return;
}
foreach (SwitchSectionSyntax section in sections)
{
SwitchLabelSyntax label = section.Labels.SingleOrDefault(shouldThrow: false);
if (label == null)
{
return;
}
SyntaxKind labelKind = label.Kind();
if (labelKind == SyntaxKind.DefaultSwitchLabel)
{
continue;
}
if (labelKind != SyntaxKind.CaseSwitchLabel)
{
Debug.Assert(labelKind == SyntaxKind.CasePatternSwitchLabel, labelKind.ToString());
return;
}
var caseLabel = (CaseSwitchLabelSyntax)label;
ExpressionSyntax value = caseLabel.Value;
if (!value.IsKind(SyntaxKind.SimpleMemberAccessExpression))
{
return;
}
var memberAccess = (MemberAccessExpressionSyntax)value;
if (!(memberAccess.Name is IdentifierNameSyntax identifierName))
{
return;
}
string kindName = identifierName.Identifier.ValueText;
if (!_syntaxKindNames.Contains(kindName))
{
return;
}
SyntaxList <StatementSyntax> statements = section.Statements;
StatementSyntax statement = statements.FirstOrDefault();
if (statement == null)
{
return;
}
if (statement is BlockSyntax block)
{
statement = block.Statements.FirstOrDefault();
}
if (!statement.IsKind(SyntaxKind.LocalDeclarationStatement))
{
return;
}
SingleLocalDeclarationStatementInfo localStatement = SyntaxInfo.SingleLocalDeclarationStatementInfo((LocalDeclarationStatementSyntax)statement);
if (!localStatement.Success)
{
return;
}
if (!(localStatement.Value is CastExpressionSyntax castExpression))
{
return;
}
if (!(castExpression.Expression is IdentifierNameSyntax localName))
{
return;
}
if (name != localName.Identifier.ValueText)
{
return;
}
if (!IsFixableSyntaxSymbol(castExpression.Type, kindName, context.SemanticModel, context.CancellationToken))
{
return;
}
}
if (localInfo.Success &&
IsLocalVariableReferenced(context, localInfo, switchStatement))
{
return;
}
DiagnosticHelpers.ReportDiagnostic(context, DiagnosticDescriptors.UsePatternMatching, switchStatement.SwitchKeyword);
string GetName()
{
switch (switchExpression.Kind())
{
case SyntaxKind.IdentifierName:
{
StatementSyntax previousStatement = switchStatement.PreviousStatement();
if (!previousStatement.IsKind(SyntaxKind.LocalDeclarationStatement))
{
return(null);
}
localInfo = SyntaxInfo.SingleLocalDeclarationStatementInfo((LocalDeclarationStatementSyntax)previousStatement);
if (!localInfo.Success)
{
return(null);
}
if (localInfo.IdentifierText != ((IdentifierNameSyntax)switchExpression).Identifier.ValueText)
{
return(null);
}
if (!localInfo.Value.IsKind(SyntaxKind.InvocationExpression))
{
return(null);
}
return(GetName2((InvocationExpressionSyntax)localInfo.Value));
}
case SyntaxKind.InvocationExpression:
{
return(GetName2((InvocationExpressionSyntax)switchExpression));
}
default:
{
return(null);
}
}
}
public static int GetInsertionIndex <TDeclaration>(
SyntaxList <TDeclaration> declarationList,
TDeclaration declaration,
CodeGenerationOptions options,
IList <bool> availableIndices,
IComparer <TDeclaration> comparerWithoutNameCheck,
IComparer <TDeclaration> comparerWithNameCheck,
Func <SyntaxList <TDeclaration>, TDeclaration> after = null,
Func <SyntaxList <TDeclaration>, TDeclaration> before = null)
where TDeclaration : SyntaxNode
{
Contract.ThrowIfTrue(availableIndices != null && availableIndices.Count != declarationList.Count + 1);
if (options != null)
{
// Try to strictly obey the after option by inserting immediately after the member containing the location
if (options.AfterThisLocation != null)
{
var afterMember = declarationList.LastOrDefault(m => m.SpanStart <= options.AfterThisLocation.SourceSpan.Start);
if (afterMember != null)
{
var index = declarationList.IndexOf(afterMember);
index = GetPreferredIndex(index + 1, availableIndices, forward: true);
if (index != -1)
{
return(index);
}
}
}
// Try to strictly obey the before option by inserting immediately before the member containing the location
if (options.BeforeThisLocation != null)
{
var beforeMember = declarationList.FirstOrDefault(m => m.Span.End >= options.BeforeThisLocation.SourceSpan.End);
if (beforeMember != null)
{
var index = declarationList.IndexOf(beforeMember);
index = GetPreferredIndex(index, availableIndices, forward: false);
if (index != -1)
{
return(index);
}
}
}
if (options.AutoInsertionLocation)
{
if (declarationList.IsEmpty())
{
return(0);
}
var desiredIndex = TryGetDesiredIndexIfGrouped(
declarationList, declaration, availableIndices,
comparerWithoutNameCheck, comparerWithNameCheck);
if (desiredIndex.HasValue)
{
return(desiredIndex.Value);
}
if (after != null)
{
var member = after(declarationList);
if (member != null)
{
var index = declarationList.IndexOf(member);
if (index >= 0)
{
index = GetPreferredIndex(index + 1, availableIndices, forward: true);
if (index != -1)
{
return(index);
}
}
}
}
if (before != null)
{
var member = before(declarationList);
if (member != null)
{
var index = declarationList.IndexOf(member);
if (index >= 0)
{
index = GetPreferredIndex(index, availableIndices, forward: false);
if (index != -1)
{
return(index);
}
}
}
}
}
}
// Otherwise, add the declaration to the end.
{
var index = GetPreferredIndex(declarationList.Count, availableIndices, forward: false);
if (index != -1)
{
return(index);
}
}
return(declarationList.Count);
}
public static MemberDeclarationSyntax FirstMember(SyntaxList <MemberDeclarationSyntax> members)
{
return(members.FirstOrDefault());
}
public static MemberDeclarationSyntax FirstMethod(SyntaxList <MemberDeclarationSyntax> members)
{
return(members.FirstOrDefault(m => m is MethodDeclarationSyntax));
}
public static int GetInsertionIndex <TDeclaration>(
SyntaxList <TDeclaration> declarationList,
TDeclaration declaration,
CodeGenerationOptions options,
IList <bool> availableIndices,
Func <SyntaxList <TDeclaration>, TDeclaration> after = null,
Func <SyntaxList <TDeclaration>, TDeclaration> before = null)
where TDeclaration : SyntaxNode
{
Contract.ThrowIfTrue(availableIndices != null && availableIndices.Count != declarationList.Count + 1);
if (options != null)
{
// Try to strictly obey the after option by inserting immediately after the member containing the location
if (options.AfterThisLocation != null)
{
var afterMember = declarationList.LastOrDefault(m => m.SpanStart <= options.AfterThisLocation.SourceSpan.Start);
if (afterMember != null)
{
var index = declarationList.IndexOf(afterMember);
index = GetPreferredIndex(index + 1, availableIndices, forward: true);
if (index != -1)
{
return(index);
}
}
}
// Try to strictly obey the before option by inserting immediately before the member containing the location
if (options.BeforeThisLocation != null)
{
var beforeMember = declarationList.FirstOrDefault(m => m.Span.End >= options.BeforeThisLocation.SourceSpan.End);
if (beforeMember != null)
{
var index = declarationList.IndexOf(beforeMember);
index = GetPreferredIndex(index, availableIndices, forward: false);
if (index != -1)
{
return(index);
}
}
}
if (options.AutoInsertionLocation)
{
if (declarationList.IsEmpty())
{
return(0);
}
else if (declarationList.IsSorted(CSharpDeclarationComparer.Instance))
{
var result = Array.BinarySearch(declarationList.ToArray(), declaration, CSharpDeclarationComparer.Instance);
var index = GetPreferredIndex(result < 0 ? ~result : result, availableIndices, forward: true);
if (index != -1)
{
return(index);
}
}
if (after != null)
{
var member = after(declarationList);
if (member != null)
{
var index = declarationList.IndexOf(member);
if (index >= 0)
{
index = GetPreferredIndex(index + 1, availableIndices, forward: true);
if (index != -1)
{
return(index);
}
}
}
}
if (before != null)
{
var member = before(declarationList);
if (member != null)
{
var index = declarationList.IndexOf(member);
if (index >= 0)
{
index = GetPreferredIndex(index, availableIndices, forward: false);
if (index != -1)
{
return(index);
}
}
}
}
}
}
// Otherwise, add the declaration to the end.
{
var index = GetPreferredIndex(declarationList.Count, availableIndices, forward: false);
if (index != -1)
{
return(index);
}
}
return(declarationList.Count);
}
public static MemberDeclarationSyntax?FirstMethod(SyntaxList <MemberDeclarationSyntax> members) => members.FirstOrDefault(m => m is MethodDeclarationSyntax);
public static MemberDeclarationSyntax?FirstMember(SyntaxList <MemberDeclarationSyntax> members) => members.FirstOrDefault();
private bool TryRemoveSummaryPrefix(ref SyntaxList <XmlNodeSyntax> summaryContent, string prefix)
{
XmlNodeSyntax firstContent = summaryContent.FirstOrDefault(IsContentElement);
XmlTextSyntax firstText = firstContent as XmlTextSyntax;
if (firstText == null)
{
return(false);
}
string firstTextContent = string.Concat(firstText.DescendantTokens());
if (!firstTextContent.TrimStart().StartsWith(prefix, StringComparison.Ordinal))
{
return(false);
}
// Find the token containing the prefix, such as "Gets or sets "
SyntaxToken prefixToken = default(SyntaxToken);
foreach (SyntaxToken textToken in firstText.TextTokens)
{
if (textToken.IsMissing)
{
continue;
}
if (!textToken.Text.TrimStart().StartsWith(prefix, StringComparison.Ordinal))
{
continue;
}
prefixToken = textToken;
break;
}
if (prefixToken.IsMissingOrDefault())
{
return(false);
}
string text = prefixToken.Text;
string valueText = prefixToken.ValueText;
int index = text.IndexOf(prefix);
if (index >= 0)
{
bool additionalCharacters = index + prefix.Length < text.Length;
text = text.Substring(0, index)
+ (additionalCharacters ? char.ToUpperInvariant(text[index + prefix.Length]).ToString() : string.Empty)
+ text.Substring(index + (additionalCharacters ? (prefix.Length + 1) : prefix.Length));
}
index = valueText.IndexOf(prefix);
if (index >= 0)
{
valueText = valueText.Remove(index, prefix.Length);
}
SyntaxToken replaced = SyntaxFactory.Token(prefixToken.LeadingTrivia, prefixToken.Kind(), text, valueText, prefixToken.TrailingTrivia);
summaryContent = summaryContent.Replace(firstText, firstText.ReplaceToken(prefixToken, replaced));
return(true);
}
private static SwitchSectionSyntax GetDefaultExpression(SyntaxList <SwitchSectionSyntax> caseSyntaxes)
{
return(caseSyntaxes.FirstOrDefault(x => x.Labels.FirstOrDefault() is DefaultSwitchLabelSyntax));
}
