public static string Creator(string mathInput)
{
var input = new AntlrInputStream(mathInput);
var lexer = new mathLexer(input);
var tokens = new CommonTokenStream(lexer);
var parser = new mathParser(tokens);
IParseTree tree = parser.prog();
var visitor = new visitorMath();
return(visitor.Visit(tree));
}
/// <summary>
/// 编译公式，默认
/// </summary>
/// <param name="exp">公式</param>
/// <returns></returns>
public bool Parse(string exp)
{
if (string.IsNullOrWhiteSpace(exp))
{
LastError = "Parameter exp invalid !";
return(false);
}
//try {
var stream = new CaseChangingCharStream(new AntlrInputStream(exp));
var lexer = new mathLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new mathParser(tokens);
var antlrErrorListener = new AntlrErrorListener();
parser.RemoveErrorListeners();
parser.AddErrorListener(antlrErrorListener);
var context = parser.prog();
var end = context.Stop.StopIndex;
if (end + 1 < exp.Length)
{
_context = null;
LastError = "Parameter exp invalid !";
return(false);
}
if (antlrErrorListener.IsError)
{
_context = null;
LastError = antlrErrorListener.ErrorMsg;
return(false);
}
_context = context;
return(true);
//} catch (Exception ex) {
// LastError = ex.Message;
// return false;
//}
}