private void ValidateScope(ILanguageScope scope)
{
// collect duplicate identifiers at this scope
// declaring a variable in a local scope hides the parent scope variables,
// so we don't need to look at other levels
var outputDeclarations = scope.Declarations.Where(decl => decl is OutputSymbol);
var nonOutputDeclarations = scope.Declarations.Where(decl => decl is not OutputSymbol);
// all symbols apart from outputs are in the same namespace, so check for uniqueness.
this.Diagnostics.AddRange(
FindDuplicateNamedSymbols(nonOutputDeclarations)
.Select(decl => DiagnosticBuilder.ForPosition(decl.NameSyntax).IdentifierMultipleDeclarations(decl.Name)));
// output symbols cannot be referenced, so the names declared by them do not need to be unique in the scope.
// we still need to ensure that they unique among other outputs.
this.Diagnostics.AddRange(
FindDuplicateNamedSymbols(outputDeclarations)
.Select(decl => DiagnosticBuilder.ForPosition(decl.NameSyntax).OutputMultipleDeclarations(decl.Name)));
// imported namespaces are reserved in all the scopes
// otherwise the user could accidentally hide a namespace which would remove the ability
// to fully qualify a function
this.Diagnostics.AddRange(nonOutputDeclarations
.Where(decl => decl.NameSyntax.IsValid && this.importedNamespaces.ContainsKey(decl.Name))
.Select(reservedSymbol => DiagnosticBuilder.ForPosition(reservedSymbol.NameSyntax).SymbolicNameCannotUseReservedNamespaceName(reservedSymbol.Name, this.importedNamespaces.Keys)));
}
private void ValidateScope(ILanguageScope scope)
{
// collect duplicate identifiers at this scope
// declaring a variable in a local scope hides the parent scope variables,
// so we don't need to look at other levels
this.Diagnostics.AddRange(scope.AllDeclarations
.Where(decl => decl.NameSyntax.IsValid)
.GroupBy(decl => decl.Name, LanguageConstants.IdentifierComparer)
.Where(group => group.Count() > 1)
.SelectMany(group => group)
.Select(decl => DiagnosticBuilder.ForPosition(decl.NameSyntax).IdentifierMultipleDeclarations(decl.Name)));
// imported namespaces are reserved in all the scopes
// otherwise the user could accidentally hide a namespace which would remove the ability
// to fully qualify a function
this.Diagnostics.AddRange(scope.AllDeclarations
.Where(decl => decl.NameSyntax.IsValid && this.importedNamespaces.ContainsKey(decl.Name))
.Select(reservedSymbol => DiagnosticBuilder.ForPosition(reservedSymbol.NameSyntax).SymbolicNameCannotUseReservedNamespaceName(reservedSymbol.Name, this.importedNamespaces.Keys)));
}
private static ResourceSymbol?LookupResourceSymbolByName(ILanguageScope scope, IdentifierSyntax identifierSyntax) => scope.Declarations .OfType <ResourceSymbol>() .FirstOrDefault(symbol => string.Equals(identifierSyntax.IdentifierName, symbol.Name, LanguageConstants.IdentifierComparison));
