/// <summary>
/// Rely on the error handler for this parser but, if no tokens are consumed
/// to recover, add an error node.
/// </summary>
/// <remarks>
/// Rely on the error handler for this parser but, if no tokens are consumed
/// to recover, add an error node. Otherwise, nothing is seen in the parse
/// tree.
/// </remarks>
protected internal virtual void Recover(RecognitionException e)
{
int i = _input.Index;
ErrorHandler.Recover(this, e);
if (_input.Index == i)
{
// no input consumed, better add an error node
if (e is InputMismatchException)
{
InputMismatchException ime = (InputMismatchException)e;
IToken tok = e.OffendingToken;
int expectedTokenType = ime.GetExpectedTokens().MinElement;
// get any element
IToken errToken = TokenFactory.Create(Tuple.Create(tok.TokenSource, tok.TokenSource.InputStream), expectedTokenType, tok.Text, TokenConstants.DefaultChannel, -1, -1, tok.Line, tok.Column);
// invalid start/stop
_ctx.AddErrorNode(errToken);
}
else
{
// NoViableAlt
IToken tok = e.OffendingToken;
IToken errToken = TokenFactory.Create(Tuple.Create(tok.TokenSource, tok.TokenSource.InputStream), TokenConstants.InvalidType, tok.Text, TokenConstants.DefaultChannel, -1, -1, tok.Line, tok.Column);
// invalid start/stop
_ctx.AddErrorNode(errToken);
}
}
}
/// <summary>
/// This is called by
/// <see cref="ReportError(Parser, RecognitionException)">ReportError(Parser, RecognitionException)
/// </see>
/// when the exception is an
/// <see cref="InputMismatchException">InputMismatchException</see>
/// .
/// </summary>
/// <seealso cref="ReportError(Parser, RecognitionException)">ReportError(Parser, RecognitionException)
/// </seealso>
/// <param name="recognizer">the parser instance</param>
/// <param name="e">the recognition exception</param>
protected internal virtual void ReportInputMismatch(Parser recognizer, InputMismatchException
e)
{
string msg = "mismatched input " + GetTokenErrorDisplay(e.OffendingToken) + " expecting "
+ e.GetExpectedTokens().ToString(recognizer.TokenNames);
NotifyErrorListeners(recognizer, msg, e);
}
/// <summary>
/// This is called by
/// <see cref="ReportError(Parser, RecognitionException)"/>
/// when the exception is an
/// <see cref="InputMismatchException"/>
/// .
/// </summary>
/// <seealso cref="ReportError(Parser, RecognitionException)"/>
/// <param name="recognizer">the parser instance</param>
/// <param name="e">the recognition exception</param>
protected internal virtual void ReportInputMismatch(Parser recognizer, InputMismatchException e)
{
string msg = "mismatched input " + GetTokenErrorDisplay(e.OffendingToken) + " expecting " + e.GetExpectedTokens().ToString(recognizer.Vocabulary);
NotifyErrorListeners(recognizer, msg, e);
}