/// <summary>
/// Parses the given VBA expression.
/// </summary>
/// <param name="expression">The expression to parse. NOTE: Call statements are not supported.</param>
/// <returns>The root of the parse tree.</returns>
public ParserRuleContext Parse(string expression)
{
var stream = new AntlrInputStream(expression);
var lexer = new VBALexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new VBAParser(tokens);
parser.AddErrorListener(new ExceptionErrorListener());
ParserRuleContext tree = null;
try
{
parser.Interpreter.PredictionMode = PredictionMode.Sll;
tree = parser.expression();
}
catch (Exception ex)
{
Logger.Warn(ex, "SLL mode failed for {0}. Retrying using LL.", expression);
tokens.Reset();
parser.Reset();
parser.Interpreter.PredictionMode = PredictionMode.Ll;
tree = parser.expression();
}
return(tree);
}