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);
}
