internal static bool IsInLocalFunctionTypeParameterScope(int position, LocalFunctionStatementSyntax localFunction)
{
Debug.Assert(localFunction != null);
if (localFunction.TypeParameterList == null)
{
// no type parameters => they are not in scope
return(false);
}
// optimization for a common case - when position is in the ReturnType, we can see type parameters
if (localFunction.ReturnType.FullSpan.Contains(position))
{
return(true);
}
// Must be in the local function, but not in an attribute on the method.
if (IsInAttributeSpecification(position, localFunction.AttributeLists))
{
return(false);
}
var firstNameToken = localFunction.Identifier;
var firstPostNameToken = localFunction.TypeParameterList.LessThanToken;
// Scope does not include local function name.
return(!IsBetweenTokens(position, firstNameToken, firstPostNameToken));
}
private static SyntaxToken GetFirstExcludedToken(StatementSyntax statement)
{
Debug.Assert(statement != null);
switch (statement.Kind())
{
case SyntaxKind.Block:
return(((BlockSyntax)statement).CloseBraceToken);
case SyntaxKind.BreakStatement:
return(((BreakStatementSyntax)statement).SemicolonToken);
case SyntaxKind.CheckedStatement:
case SyntaxKind.UncheckedStatement:
return(((CheckedStatementSyntax)statement).Block.CloseBraceToken);
case SyntaxKind.ContinueStatement:
return(((ContinueStatementSyntax)statement).SemicolonToken);
case SyntaxKind.LocalDeclarationStatement:
return(((LocalDeclarationStatementSyntax)statement).SemicolonToken);
case SyntaxKind.DoStatement:
return(((DoStatementSyntax)statement).SemicolonToken);
case SyntaxKind.EmptyStatement:
return(((EmptyStatementSyntax)statement).SemicolonToken);
case SyntaxKind.ExpressionStatement:
return(((ExpressionStatementSyntax)statement).SemicolonToken);
case SyntaxKind.FixedStatement:
return(GetFirstExcludedToken(((FixedStatementSyntax)statement).Statement));
case SyntaxKind.ForEachStatement:
case SyntaxKind.ForEachVariableStatement:
return(GetFirstExcludedToken(((CommonForEachStatementSyntax)statement).Statement));
case SyntaxKind.ForStatement:
return(GetFirstExcludedToken(((ForStatementSyntax)statement).Statement));
case SyntaxKind.GotoDefaultStatement:
case SyntaxKind.GotoCaseStatement:
case SyntaxKind.GotoStatement:
return(((GotoStatementSyntax)statement).SemicolonToken);
case SyntaxKind.IfStatement:
IfStatementSyntax ifStmt = (IfStatementSyntax)statement;
ElseClauseSyntax elseOpt = ifStmt.Else;
return(GetFirstExcludedToken(elseOpt == null ? ifStmt.Statement : elseOpt.Statement));
case SyntaxKind.LabeledStatement:
return(GetFirstExcludedToken(((LabeledStatementSyntax)statement).Statement));
case SyntaxKind.LockStatement:
return(GetFirstExcludedToken(((LockStatementSyntax)statement).Statement));
case SyntaxKind.ReturnStatement:
return(((ReturnStatementSyntax)statement).SemicolonToken);
case SyntaxKind.SwitchStatement:
return(((SwitchStatementSyntax)statement).CloseBraceToken);
case SyntaxKind.ThrowStatement:
return(((ThrowStatementSyntax)statement).SemicolonToken);
case SyntaxKind.TryStatement:
TryStatementSyntax tryStmt = (TryStatementSyntax)statement;
FinallyClauseSyntax finallyClause = tryStmt.Finally;
if (finallyClause != null)
{
return(finallyClause.Block.CloseBraceToken);
}
CatchClauseSyntax lastCatch = tryStmt.Catches.LastOrDefault();
if (lastCatch != null)
{
return(lastCatch.Block.CloseBraceToken);
}
return(tryStmt.Block.CloseBraceToken);
case SyntaxKind.UnsafeStatement:
return(((UnsafeStatementSyntax)statement).Block.CloseBraceToken);
case SyntaxKind.UsingStatement:
return(GetFirstExcludedToken(((UsingStatementSyntax)statement).Statement));
case SyntaxKind.WhileStatement:
return(GetFirstExcludedToken(((WhileStatementSyntax)statement).Statement));
case SyntaxKind.YieldReturnStatement:
case SyntaxKind.YieldBreakStatement:
return(((YieldStatementSyntax)statement).SemicolonToken);
case SyntaxKind.LocalFunctionStatement:
LocalFunctionStatementSyntax localFunctionStmt = (LocalFunctionStatementSyntax)statement;
if (localFunctionStmt.Body != null)
{
return(GetFirstExcludedToken(localFunctionStmt.Body));
}
if (localFunctionStmt.SemicolonToken != default(SyntaxToken))
{
return(localFunctionStmt.SemicolonToken);
}
return(localFunctionStmt.ParameterList.GetLastToken());
default:
throw ExceptionUtilities.UnexpectedValue(statement.Kind());
}
}
