private static void AnalyzeSymbol(SyntaxNodeAnalysisContext context)
{
var invocation = context.Node as InvocationExpressionSyntax;
var info = context.SemanticModel.GetSymbolInfo(invocation);
var method = info.Symbol as IMethodSymbol;
if (method == null)
{
return;
}
// is serilog even present in the compilation?
var messageTemplateAttribute = context.SemanticModel.Compilation.GetTypeByMetadataName("Serilog.Core.MessageTemplateFormatMethodAttribute");
if (messageTemplateAttribute == null)
{
return;
}
// is it a serilog logging method?
var attributes = method.GetAttributes();
var attributeData = attributes.FirstOrDefault(x => x.AttributeClass == messageTemplateAttribute);
if (attributeData == null)
{
return;
}
string messageTemplateName = attributeData.ConstructorArguments.First().Value as string;
// check for errors in the MessageTemplate
var arguments = new List <SourceArgument>();
var properties = new List <PropertyToken>();
var hasErrors = false;
var literalSpan = default(TextSpan);
var exactPositions = true;
var stringText = default(string);
foreach (var argument in invocation.ArgumentList.Arguments)
{
var paramter = RoslynHelper.DetermineParameter(argument, context.SemanticModel, true, context.CancellationToken);
if (paramter.Name == messageTemplateName)
{
string messageTemplate;
// is it a simple string literal?
var literal = argument.Expression as LiteralExpressionSyntax;
if (literal == null)
{
// can we at least get a computed constant value for it?
var constantValue = context.SemanticModel.GetConstantValue(argument.Expression, context.CancellationToken);
if (!constantValue.HasValue || !(constantValue.Value is string))
{
context.ReportDiagnostic(Diagnostic.Create(ConstantMessageTemplateRule, argument.Expression.GetLocation(), argument.Expression.ToString()));
continue;
}
// we can't map positions back from the computed string into the real positions
exactPositions = false;
messageTemplate = constantValue.Value as string;
}
else
{
stringText = literal.Token.Text;
exactPositions = true;
messageTemplate = literal.Token.ValueText;
}
literalSpan = argument.Expression.GetLocation().SourceSpan;
var messageTemplateDiagnostics = AnalyzingMessageTemplateParser.Analyze(messageTemplate);
foreach (var templateDiagnostic in messageTemplateDiagnostics)
{
var property = templateDiagnostic as PropertyToken;
if (property != null)
{
properties.Add(property);
continue;
}
var diagnostic = templateDiagnostic as MessageTemplateDiagnostic;
if (diagnostic != null)
{
hasErrors = true;
ReportDiagnostic(ref context, ref literalSpan, stringText, exactPositions, TemplateRule, diagnostic);
}
}
}
else if (paramter.Name.StartsWith("propertyValue", StringComparison.Ordinal))
{
var location = argument.GetLocation().SourceSpan;
arguments.Add(new SourceArgument {
StartIndex = location.Start, Length = location.Length
});
}
}
// do properties match up?
if (!hasErrors && literalSpan != default(TextSpan) && (arguments.Count > 0 || properties.Count > 0))
{
var diagnostics = PropertyBindingAnalyzer.AnalyzeProperties(properties, arguments);
foreach (var diagnostic in diagnostics)
{
ReportDiagnostic(ref context, ref literalSpan, stringText, exactPositions, PropertyBindingRule, diagnostic);
}
// are there duplicate property names?
var usedNames = new HashSet <string>();
foreach (var property in properties)
{
if (!property.IsPositional && !usedNames.Add(property.PropertyName))
{
ReportDiagnostic(ref context, ref literalSpan, stringText, exactPositions, UniquePropertyNameRule, new MessageTemplateDiagnostic(property.StartIndex, property.Length, property.PropertyName));
}
}
}
// is this an overload where the exception argument is used?
var exception = context.SemanticModel.Compilation.GetTypeByMetadataName("System.Exception");
if (method.Parameters.First().Type == exception)
{
return;
}
// is there an overload with the exception argument?
if (!method.ContainingType.GetMembers().OfType <IMethodSymbol>().Any(x => x.Name == method.Name && x.Parameters.FirstOrDefault()?.Type == exception))
{
return;
}
// check wether any of the format arguments is an exception
foreach (var argument in invocation.ArgumentList.Arguments)
{
var arginfo = context.SemanticModel.GetTypeInfo(argument.Expression);
if (IsException(exception, arginfo.Type))
{
context.ReportDiagnostic(Diagnostic.Create(ExceptionRule, argument.GetLocation(), argument.Expression.ToFullString()));
}
}
}
private static void AnalyzeSymbol(SyntaxNodeAnalysisContext context)
{
var invocation = context.Node as InvocationExpressionSyntax;
var info = context.SemanticModel.GetSymbolInfo(invocation, context.CancellationToken);
var method = info.Symbol as IMethodSymbol;
if (method == null)
{
return;
}
// is serilog even present in the compilation?
var messageTemplateAttribute = context.SemanticModel.Compilation.GetTypeByMetadataName("Serilog.Core.MessageTemplateFormatMethodAttribute");
if (messageTemplateAttribute == null)
{
return;
}
// check if ForContext<T> / ForContext(typeof(T)) calls use the containing type as T
if (method.Name == ForContext && method.ReturnType.ToString() == ILogger)
{
CheckForContextCorrectness(ref context, invocation, method);
}
// is it a serilog logging method?
var attributes = method.GetAttributes();
var attributeData = attributes.FirstOrDefault(x => x.AttributeClass == messageTemplateAttribute);
if (attributeData == null)
{
return;
}
string messageTemplateName = attributeData.ConstructorArguments.First().Value as string;
// check for errors in the MessageTemplate
var arguments = default(List <SourceArgument>);
var properties = new List <PropertyToken>();
var hasErrors = false;
var literalSpan = default(TextSpan);
var exactPositions = true;
var stringText = default(string);
var invocationArguments = invocation.ArgumentList.Arguments;
foreach (var argument in invocationArguments)
{
var parameter = RoslynHelper.DetermineParameter(argument, context.SemanticModel, true, context.CancellationToken);
if (parameter.Name == messageTemplateName)
{
string messageTemplate;
// is it a simple string literal?
if (argument.Expression is LiteralExpressionSyntax literal)
{
stringText = literal.Token.Text;
exactPositions = true;
messageTemplate = literal.Token.ValueText;
}
else
{
// can we at least get a computed constant value for it?
var constantValue = context.SemanticModel.GetConstantValue(argument.Expression, context.CancellationToken);
if (!constantValue.HasValue || !(constantValue.Value is string constString))
{
INamedTypeSymbol StringType() => context.SemanticModel.Compilation.GetTypeByMetadataName("System.String");
if (context.SemanticModel.GetSymbolInfo(argument.Expression, context.CancellationToken).Symbol is IFieldSymbol field && field.Name == "Empty" && field.Type == StringType())
{
constString = "";
}
else
{
context.ReportDiagnostic(Diagnostic.Create(ConstantMessageTemplateRule, argument.Expression.GetLocation(), argument.Expression.ToString()));
continue;
}
}
// we can't map positions back from the computed string into the real positions
exactPositions = false;
messageTemplate = constString;
}
literalSpan = argument.Expression.GetLocation().SourceSpan;
var messageTemplateDiagnostics = AnalyzingMessageTemplateParser.Analyze(messageTemplate);
foreach (var templateDiagnostic in messageTemplateDiagnostics)
{
if (templateDiagnostic is PropertyToken property)
{
properties.Add(property);
continue;
}
if (templateDiagnostic is MessageTemplateDiagnostic diagnostic)
{
hasErrors = true;
ReportDiagnostic(ref context, ref literalSpan, stringText, exactPositions, TemplateRule, diagnostic);
}
}
var messageTemplateArgumentIndex = invocationArguments.IndexOf(argument);
arguments = invocationArguments.Skip(messageTemplateArgumentIndex + 1).Select(x =>
{
var location = x.GetLocation().SourceSpan;
return(new SourceArgument {
Argument = x, StartIndex = location.Start, Length = location.Length
});
}).ToList();
break;
}
}