private static SyntaxToken GetFirstIncludedToken(StatementSyntax statement, bool inRecursiveCall = false)
{
Debug.Assert(statement != null);
switch (statement.Kind())
{
case SyntaxKind.Block:
return(((BlockSyntax)statement).OpenBraceToken);
case SyntaxKind.BreakStatement:
return(((BreakStatementSyntax)statement).BreakKeyword);
case SyntaxKind.CheckedStatement:
case SyntaxKind.UncheckedStatement:
return(((CheckedStatementSyntax)statement).Keyword);
case SyntaxKind.ContinueStatement:
return(((ContinueStatementSyntax)statement).ContinueKeyword);
case SyntaxKind.ExpressionStatement:
case SyntaxKind.LocalDeclarationStatement:
return(statement.GetFirstToken());
case SyntaxKind.DoStatement:
return(((DoStatementSyntax)statement).DoKeyword);
case SyntaxKind.EmptyStatement:
return(default(SyntaxToken)); //The caller will have to check for this.
case SyntaxKind.FixedStatement:
return(((FixedStatementSyntax)statement).FixedKeyword);
case SyntaxKind.ForEachStatement:
// NB: iteration variable is only in scope in body.
ForEachStatementSyntax forEachSyntax = (ForEachStatementSyntax)statement;
if (inRecursiveCall)
{
return(forEachSyntax.ForEachKeyword);
}
return(GetFirstIncludedToken(forEachSyntax.Statement, inRecursiveCall: true));
case SyntaxKind.ForStatement:
// Section 8.8.3 of the spec says that the scope of the loop variable starts at
// its declaration. If it's not there, then the scope we are interested in is
// the loop body.
ForStatementSyntax forSyntax = (ForStatementSyntax)statement;
if (inRecursiveCall)
{
return(forSyntax.ForKeyword);
}
VariableDeclarationSyntax declOpt = forSyntax.Declaration;
return(declOpt == null?GetFirstIncludedToken(forSyntax.Statement, inRecursiveCall : true) : declOpt.GetFirstToken());
case SyntaxKind.GotoDefaultStatement:
case SyntaxKind.GotoCaseStatement:
case SyntaxKind.GotoStatement:
return(((GotoStatementSyntax)statement).GotoKeyword);
case SyntaxKind.IfStatement:
return(((IfStatementSyntax)statement).IfKeyword);
case SyntaxKind.LabeledStatement:
return(((LabeledStatementSyntax)statement).Identifier);
case SyntaxKind.LockStatement:
return(((LockStatementSyntax)statement).LockKeyword);
case SyntaxKind.ReturnStatement:
return(((ReturnStatementSyntax)statement).ReturnKeyword);
case SyntaxKind.SwitchStatement:
return(((SwitchStatementSyntax)statement).OpenBraceToken);
case SyntaxKind.ThrowStatement:
return(((ThrowStatementSyntax)statement).ThrowKeyword);
case SyntaxKind.TryStatement:
return(((TryStatementSyntax)statement).TryKeyword);
case SyntaxKind.UnsafeStatement:
return(((UnsafeStatementSyntax)statement).UnsafeKeyword);
case SyntaxKind.UsingStatement:
return(((UsingStatementSyntax)statement).UsingKeyword);
case SyntaxKind.WhileStatement:
return(((WhileStatementSyntax)statement).WhileKeyword);
case SyntaxKind.YieldReturnStatement:
case SyntaxKind.YieldBreakStatement:
return(((YieldStatementSyntax)statement).YieldKeyword);
default:
throw ExceptionUtilities.UnexpectedValue(statement.Kind());
}
}
