internal static async Task <long> GetLinesOfCodeAsync(ImmutableArray <SyntaxReference> declarations, ISymbol symbol, SemanticModelProvider semanticModelProvider, CancellationToken cancellationToken)
{
long linesOfCode = 0;
foreach (var decl in declarations)
{
SyntaxNode declSyntax = await GetTopmostSyntaxNodeForDeclarationAsync(decl, symbol, semanticModelProvider, cancellationToken).ConfigureAwait(false);
// For namespace symbols, don't count lines of code for declarations of child namespaces.
// For example, "namespace N1.N2 { }" is a declaration reference for N1, but the actual declaration is for N2.
if (symbol.Kind == SymbolKind.Namespace)
{
var model = semanticModelProvider.GetSemanticModel(declSyntax);
if (model.GetDeclaredSymbol(declSyntax, cancellationToken) != (object)symbol)
{
continue;
}
}
FileLinePositionSpan linePosition = declSyntax.SyntaxTree.GetLineSpan(declSyntax.FullSpan, cancellationToken);
long delta = linePosition.EndLinePosition.Line - linePosition.StartLinePosition.Line;
if (delta == 0)
{
// Declaration on a single line, we count it as a separate line.
delta = 1;
}
linesOfCode += delta;
}
return(linesOfCode);
}
internal static async Task <SyntaxNode> GetTopmostSyntaxNodeForDeclarationAsync(SyntaxReference declaration, ISymbol declaredSymbol, SemanticModelProvider semanticModelProvider, CancellationToken cancellationToken)
{
var declSyntax = await declaration.GetSyntaxAsync(cancellationToken).ConfigureAwait(false);
if (declSyntax.Language == LanguageNames.VisualBasic)
{
SemanticModel model = semanticModelProvider.GetSemanticModel(declSyntax);
while (declSyntax.Parent != null && Equals(model.GetDeclaredSymbol(declSyntax.Parent, cancellationToken), declaredSymbol))
{
declSyntax = declSyntax.Parent;
}
}
return(declSyntax);
}
internal static async Task <(int cyclomaticComplexity, ComputationalComplexityMetrics computationalComplexityMetrics)> ComputeCoupledTypesAndComplexityExcludingMemberDeclsAsync(
ImmutableArray <SyntaxReference> declarations,
ISymbol symbol,
ImmutableHashSet <INamedTypeSymbol> .Builder builder,
SemanticModelProvider semanticModelProvider,
CancellationToken cancellationToken)
{
int cyclomaticComplexity = 0;
ComputationalComplexityMetrics computationalComplexityMetrics = ComputationalComplexityMetrics.Default;
var nodesToProcess = new Queue <SyntaxNode>();
foreach (var declaration in declarations)
{
SyntaxNode syntax = await GetTopmostSyntaxNodeForDeclarationAsync(declaration, symbol, semanticModelProvider, cancellationToken).ConfigureAwait(false);
nodesToProcess.Enqueue(syntax);
// Ensure we process parameter initializers and attributes.
var parameters = GetParameters(symbol);
foreach (var parameter in parameters)
{
var parameterSyntaxRef = parameter.DeclaringSyntaxReferences.FirstOrDefault();
if (parameterSyntaxRef != null)
{
var parameterSyntax = await parameterSyntaxRef.GetSyntaxAsync(cancellationToken).ConfigureAwait(false);
nodesToProcess.Enqueue(parameterSyntax);
}
}
var attributes = symbol.GetAttributes();
if (symbol is IMethodSymbol methodSymbol)
{
attributes = attributes.AddRange(methodSymbol.GetReturnTypeAttributes());
}
foreach (var attribute in attributes)
{
if (attribute.ApplicationSyntaxReference != null)
{
var attributeSyntax = await attribute.ApplicationSyntaxReference.GetSyntaxAsync(cancellationToken).ConfigureAwait(false);
nodesToProcess.Enqueue(attributeSyntax);
}
}
do
{
var node = nodesToProcess.Dequeue();
var model = semanticModelProvider.GetSemanticModel(node);
if (!ReferenceEquals(node, syntax))
{
var declaredSymbol = model.GetDeclaredSymbol(node, cancellationToken);
if (declaredSymbol != null && !Equals(symbol, declaredSymbol) && declaredSymbol.Kind != SymbolKind.Parameter)
{
// Skip member declarations.
continue;
}
}
var typeInfo = model.GetTypeInfo(node, cancellationToken);
AddCoupledNamedTypesCore(builder, typeInfo.Type);
var operationBlock = model.GetOperation(node, cancellationToken);
if (operationBlock != null && operationBlock.Parent == null)
{
switch (operationBlock.Kind)
{
case OperationKind.Block:
case OperationKind.MethodBodyOperation:
case OperationKind.ConstructorBodyOperation:
cyclomaticComplexity += 1;
break;
}
computationalComplexityMetrics = computationalComplexityMetrics.Union(ComputationalComplexityMetrics.Compute(operationBlock));
// Add used types within executable code in the operation tree.
foreach (var operation in operationBlock.DescendantsAndSelf())
{
#if LEGACY_CODE_METRICS_MODE
// Legacy mode does not account for code within lambdas/local functions for code metrics.
if (operation.IsWithinLambdaOrLocalFunction())
{
continue;
}
#endif
if (!operation.IsImplicit && hasConditionalLogic(operation))
{
cyclomaticComplexity += 1;
}
AddCoupledNamedTypesCore(builder, operation.Type);
// Handle static member accesses specially as there is no operation for static type off which the member is accessed.
if (operation is IMemberReferenceOperation memberReference &&
memberReference.Member.IsStatic)
{
AddCoupledNamedTypesCore(builder, memberReference.Member.ContainingType);
}
else if (operation is IInvocationOperation invocation &&
(invocation.TargetMethod.IsStatic || invocation.TargetMethod.IsExtensionMethod))
{
AddCoupledNamedTypesCore(builder, invocation.TargetMethod.ContainingType);
}
}
}