public static Function Parse(string formula)
{
var formulaObj = new CalculatorVisitor().Visit(
new CalculatorParser(new CommonTokenStream(
new CalculatorLexer(new AntlrInputStream(formula)))).prog());
return(formulaObj);
}
static void Main(string[] args)
{
var text = "1 + 3 - 1";
var inputStream = new AntlrInputStream(text);
var lexer = new ExampleLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
var parser = new ExampleParser(commonTokenStream);
var context = parser.expression();
var visitor = new CalculatorVisitor();
var result = context.Accept(visitor);
Console.WriteLine($"result = {result}");
}
static void Main(string[] args)
{
try
{
StreamReader inputStream = new StreamReader(Console.OpenStandardInput());
AntlrInputStream input = new AntlrInputStream(inputStream.ReadToEnd());
CalculatorLexer lexer = new CalculatorLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
CalculatorParser parser = new CalculatorParser(tokens);
IParseTree tree = parser.prog();
Console.WriteLine(tree.ToStringTree(parser));
CalculatorVisitor visitor = new CalculatorVisitor();
Console.WriteLine(visitor.Visit(tree));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.ReadLine();
}
static void Main(string[] args)
{
try
{
StreamReader inputStream = new StreamReader(Console.OpenStandardInput());
AntlrInputStream input = new AntlrInputStream(inputStream.ReadToEnd());
CalculatorLexer lexer = new CalculatorLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
CalculatorParser parser = new CalculatorParser(tokens);
IParseTree tree = parser.input();
Console.WriteLine(tree.ToStringTree(parser));
CalculatorVisitor visitor = new CalculatorVisitor();
Console.WriteLine(visitor.Visit(tree));
}
catch (DivideByZeroException ex)
{
Console.WriteLine("Cannot Divide By Zero");
}
Console.ReadLine();
}
