public object Evaluate(string formula)
{
if (string.IsNullOrEmpty(formula))
{
return(0);
}
var inputStream = new AntlrInputStream(formula);
var lexer = new FormulaLexer(inputStream);
var tokens = new CommonTokenStream(lexer);
var parser = new FormulaParser(tokens);
var errorListener = new FormulaErrorListener();
parser.RemoveErrorListeners();
parser.AddErrorListener(errorListener);
var parseTree = parser.main();
if (!errorListener.IsValid)
{
throw new FormulaException(
errorListener.ErrorLocation,
errorListener.ErrorMessage);
}
return(new EvaluationVisitor(Functions).VisitMain(parseTree));
}
/// <summary>
/// 翻译公式
/// </summary>
/// <param name="formula">公式</param>
/// <param name="availableMethodsType">包含公式中可用静态方法的类型</param>
/// <returns></returns>
public string Interpret(string formula, Type availableMethodsType)
{
AntlrInputStream input = new AntlrInputStream(formula);
FormulaLexer lexer = new FormulaLexer(input);
lexer.RemoveErrorListeners();
lexer.AddErrorListener(LexerErrorListener.Instance);
CommonTokenStream tokens = new CommonTokenStream(lexer);
FormulaParser parser = new FormulaParser(tokens);
parser.RemoveErrorListeners();
parser.AddErrorListener(ParserErrorListener.Instance);
FormulaCSListener listener = new FormulaCSListener(availableMethodsType);
ParseTreeWalker walker = new ParseTreeWalker();
walker.Walk(listener, parser.formula());
return(listener.Result);
}
