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);
}
}
protected CommonAST(CommonAST another)
{
// don't include child/sibling pointers in Clone()/dup()
//down = another.down;
//right = another.right;
ttype = another.ttype;
text = (another.text == null) ? null : String.Copy(another.text);
}
protected CommonAST(CommonAST another)
{
// don't include child/sibling pointers in Clone()/dup()
//down = another.down;
//right = another.right;
ttype = another.ttype;
text = (another.text==null) ? null : String.Copy(another.text);
}
public static void Main(string[] args)
{
try {
ExprLexer lexer = new ExprLexer(new CharBuffer(Console.In));
ExprParser parser = new ExprParser(lexer);
// set the type of tree node to create; this is default action
// so it is unnecessary to do it here, but demos capability.
parser.setASTNodeClass("antlr.CommonAST");
parser.expr();
antlr.CommonAST ast = (antlr.CommonAST)parser.getAST();
if (ast != null) {
Console.Out.WriteLine(ast.ToStringList());
} else {
Console.Out.WriteLine("null AST");
}
} catch(Exception e) {
Console.Error.WriteLine("exception: "+e);
}
}