private FEELRule RetrieveParser(string exprText)
{
var inputStream = CharStreams.fromstring(exprText);
var lexer = new FEELLexer(inputStream);
lexer.RemoveErrorListeners();
lexer.AddErrorListener(new LexerErrors());
var tokenStream = new CommonTokenStream(lexer);
var parser = new FEELRule(tokenStream);
parser.RemoveErrorListeners();
parser.AddErrorListener(new ParserErrors());
parser.BuildParseTree = true;
return(parser);
}
private void ThrowParserErrors(string exprTxt, string whichFeel, FEELRule parser)
{
var parserErrs = parser.ErrorListeners[0] as ParserErrors;
if (parserErrs.ErrorList.Any())
{
var errTxt = "";
foreach (var item in parserErrs.ErrorList)
{
errTxt += item;
}
throw new FEELException($"Problem parsing the input expresion: {exprTxt} : {whichFeel} : {errTxt}");
}
}
