override public IEnumerable <IDiagnostic> AnalyzeInternal(SemanticModel model)
{
// TODO: Performance: Use a visitor to visit VariableAccesssyntax and collects the non-error symbols into a list.
// Then do a symbol visitor to go through all the symbols that exist and compare.
// Same issue for unused-params rule.
// variables must have a reference of type VariableAccessSyntax
var unreferencedVariables = model.Root.Declarations.OfType <VariableSymbol>()
.Where(sym => !model.FindReferences(sym).OfType <VariableAccessSyntax>().Any());
foreach (var sym in unreferencedVariables)
{
yield return(CreateDiagnosticForSpan(sym.NameSyntax.Span, sym.Name));
}
// TODO: This will not find local variables because they are not in the top-level scope.
// Therefore this will not find scenarios such as a loop variable that is not used within the loop
// local variables must have a reference of type VariableAccessSyntax
var unreferencedLocalVariables = model.Root.Declarations.OfType <LocalVariableSymbol>()
.Where(sym => !model.FindReferences(sym).OfType <VariableAccessSyntax>().Any());
foreach (var sym in unreferencedLocalVariables)
{
yield return(CreateDiagnosticForSpan(sym.NameSyntax.Span, sym.Name));
}
}
override public IEnumerable <IDiagnostic> AnalyzeInternal(SemanticModel model)
{
// parameters must have at least two references
// 1) One reference will be the the paramater syntax declaration
// 2) VariableAccessSyntax indicates a reference to the parameter
var unreferencedParams = model.Root.ParameterDeclarations
.Where(sym => !model.FindReferences(sym).OfType <VariableAccessSyntax>().Any());
return(unreferencedParams.Select(param => CreateDiagnosticForSpan(param.NameSyntax.Span, param.Name)));
}
