private ErrorExpression Error(string verbatimImage = null, Expression preceeding = null) {
var res = new ErrorExpression(verbatimImage, preceeding);
res.SetLoc(GetStart(), GetEnd());
return res;
}
private ErrorExpression ReadLineAsError(Expression preceeding, string message) {
var t = NextToken();
Debug.Assert(t.Kind == TokenKind.Colon);
var image = new StringBuilder();
if (_verbatim) {
image.Append(_tokenWhiteSpace);
}
image.Append(':');
while (!IsEndOfLineToken(PeekToken())) {
t = NextToken();
if (_verbatim) {
image.Append(_tokenWhiteSpace);
image.Append(t.VerbatimImage);
} else {
image.Append(t.Image);
}
}
var err = new ErrorExpression(image.ToString(), preceeding);
err.SetLoc(preceeding.StartIndex, GetEnd());
ReportSyntaxError(err.StartIndex, err.EndIndex, message);
return err;
}