/// <summary>
/// Push current input into the stack
/// </summary>
public void PushInput(TextReader reader, string name)
{
Debug.Assert(currentToken != null &&
(currentToken.TokenType == LexerTokenType.NewLine || currentToken.TokenType == LexerTokenType.Eof), "New input can only be pushed after new line token or EOF");
if (name.Equals(currentInput.Filename, StringComparison.OrdinalIgnoreCase))
{
RaiseError(ErrorCode.CircularReference, GetCircularReferenceErrorMessage(name));
}
foreach (LexerInput input in inputStack)
{
if (name.Equals(input.Filename, StringComparison.OrdinalIgnoreCase))
{
RaiseError(ErrorCode.CircularReference, GetCircularReferenceErrorMessage(name));
}
}
inputStack.Push(currentInput);
currentInput = new LexerInput(reader, name);
SetState(RuleLine);
// We don't want to close the input, in that case the current file would be taken out of the
// input stack and cycle detection won't work.
popInputAtNextConsume = false;
ConsumeToken();
}
/// <summary>
/// Constructor for the lexer class used by SMO Batch Parser
/// </summary>
public Lexer(TextReader input, string name)
{
currentInput = new LexerInput(input, name);
currentToken = null;
RecognizeSqlCmdSyntax = true;
SetState(RuleLine);
}
public void PopAndCloseInput()
{
if (currentInput != null)
{
currentInput.Dispose();
currentInput = null;
}
if (inputStack.Count > 0)
{
currentInput = inputStack.Pop();
SetState(RuleLine);
}
}