/// <summary>
/// Make a local variable symbol whose type can be inferred (if necessary) by binding and enclosing construct.
/// </summary>
internal static LocalSymbol MakeLocalSymbolWithEnclosingContext(
Symbol containingSymbol,
Binder scopeBinder,
Binder nodeBinder,
TypeSyntax typeSyntax,
SyntaxToken identifierToken,
LocalDeclarationKind kind,
SyntaxNode nodeToBind,
SyntaxNode forbiddenZone)
{
Debug.Assert(
nodeToBind.Kind() == SyntaxKind.CasePatternSwitchLabel ||
nodeToBind.Kind() == SyntaxKind.ThisConstructorInitializer ||
nodeToBind.Kind() == SyntaxKind.BaseConstructorInitializer ||
nodeToBind.Kind() == SyntaxKind.SwitchExpressionArm ||
nodeToBind.Kind() == SyntaxKind.ArgumentList && nodeToBind.Parent is ConstructorInitializerSyntax ||
nodeToBind.Kind() == SyntaxKind.VariableDeclaration &&
new[] { SyntaxKind.LocalDeclarationStatement, SyntaxKind.UsingStatement, SyntaxKind.FixedStatement }.
Contains(nodeToBind.Ancestors().OfType <StatementSyntax>().First().Kind()) ||
nodeToBind is ExpressionSyntax);
Debug.Assert(!(nodeToBind.Kind() == SyntaxKind.SwitchExpressionArm) || nodeBinder is SwitchExpressionArmBinder);
return(typeSyntax.IsNullWithNoType() != false && kind != LocalDeclarationKind.DeclarationExpressionVariable
? new LocalSymbolWithEnclosingContext(containingSymbol, scopeBinder, nodeBinder, typeSyntax, identifierToken, kind, nodeToBind, forbiddenZone)
: new SourceLocalSymbol(containingSymbol, scopeBinder, Compiler.RefKind.None, typeSyntax, identifierToken, kind));
}
/// <summary>
/// Make a local variable symbol for an element of a deconstruction,
/// which can be inferred (if necessary) by binding the enclosing statement.
/// </summary>
/// <param name="containingSymbol"></param>
/// <param name="scopeBinder">
/// Binder that owns the scope for the local, the one that returns it in its <see cref="Binder.Locals"/> array.
/// </param>
/// <param name="nodeBinder">
/// Enclosing binder for the location where the local is declared.
/// It should be used to bind something at that location.
/// </param>
/// <param name="closestTypeSyntax"></param>
/// <param name="identifierToken"></param>
/// <param name="kind"></param>
/// <param name="deconstruction"></param>
/// <returns></returns>
public static SourceLocalSymbol MakeDeconstructionLocal(
Symbol containingSymbol,
Binder scopeBinder,
Binder nodeBinder,
TypeSyntax closestTypeSyntax,
SyntaxToken identifierToken,
LocalDeclarationKind kind,
SyntaxNode deconstruction)
{
Debug.Assert(closestTypeSyntax != null);
Debug.Assert(nodeBinder != null);
return(closestTypeSyntax.IsNullWithNoType()
? new DeconstructionLocalSymbol(containingSymbol, scopeBinder, nodeBinder, closestTypeSyntax, identifierToken, kind, deconstruction)
: new SourceLocalSymbol(containingSymbol, scopeBinder, RefKind.None, closestTypeSyntax, identifierToken, kind));
}
internal static GlobalExpressionVariable Create(
SourceMemberContainerTypeSymbol containingType,
DeclarationModifiers modifiers,
TypeSyntax typeSyntax,
string name,
SyntaxNode syntax,
Location location,
FieldSymbol containingFieldOpt,
SyntaxNode nodeToBind)
{
Debug.Assert(nodeToBind.Kind() == SyntaxKind.VariableDeclaration || nodeToBind is ExpressionSyntax);
var syntaxReference = syntax.GetReference();
return((typeSyntax == null || typeSyntax.IsNullWithNoType())
? new InferrableGlobalExpressionVariable(containingType, modifiers, typeSyntax, name, syntaxReference, location, containingFieldOpt, nodeToBind)
: new GlobalExpressionVariable(containingType, modifiers, typeSyntax, name, syntaxReference, location));
}