protected static IParseTree AntlrParse(string expression)
{
var inputStream = new AntlrInputStream(expression);
var lexer = new ExpressionAntlrLexer(inputStream);
lexer.RemoveErrorListeners();
var tokenStream = new CommonTokenStream(lexer);
var parser = new ExpressionAntlrParser(tokenStream);
parser.RemoveErrorListeners();
parser.AddErrorListener(ParserErrorListener.Instance);
parser.BuildParseTree = true;
return(parser.file()?.expression());
}
protected static IParseTree AntlrParse(string expression)
{
if (expressionDict.TryGetValue(expression, out var expressionParseTree))
{
return(expressionParseTree);
}
var inputStream = new AntlrInputStream(expression);
var lexer = new ExpressionAntlrLexer(inputStream);
lexer.RemoveErrorListeners();
var tokenStream = new CommonTokenStream(lexer);
var parser = new ExpressionAntlrParser(tokenStream);
parser.RemoveErrorListeners();
parser.AddErrorListener(ParserErrorListener.Instance);
parser.BuildParseTree = true;
var expressionContext = parser.file()?.expression();
expressionDict.TryAdd(expression, expressionContext);
return(expressionContext);
}
