public static void Main(string[] args)
{
try
{
CalcLexer lexer = new CalcLexer(new CharBuffer(Console.In));
lexer.setFilename("<stdin>");
CalcParser parser = new CalcParser(lexer);
parser.setFilename("<stdin>");
// Parse the input expression
parser.expr();
CommonAST t = (CommonAST)parser.getAST();
// Print the resulting tree out in LISP notation
Console.Out.WriteLine(t.ToStringTree());
CalcTreeWalker walker = new CalcTreeWalker();
// Traverse the tree created by the parser
float r = walker.expr(t);
Console.Out.WriteLine("value is " + r);
}
catch (TokenStreamException e)
{
Console.Error.WriteLine("exception: " + e);
}
catch (RecognitionException e)
{
Console.Error.WriteLine("exception: " + e);
}
}
