source: trunk/yao/share/antlr-2.7.7/examples/java/transform/Calc.java @ 1

import java.io.*;
import antlr.CommonAST;
import antlr.collections.AST;
import antlr.DumpASTVisitor;

class Calc {
        public static void main(String[] args) {
                try {
                        CalcLexer lexer = new CalcLexer(new DataInputStream(System.in));
                        CalcParser parser = new CalcParser(lexer);
                        // Parse the input expression
                        parser.expr();
                        CommonAST t = (CommonAST)parser.getAST();
                        // Print the resulting tree out in LISP notation
                        System.out.println(t.toStringList());
                        CalcTreeWalker walker = new CalcTreeWalker();
                        // Traverse the tree created by the parser
                        walker.expr(t);
                        t = (CommonAST)walker.getAST();
                        System.out.println(t.toStringList());
                } catch(Exception e) {
                        System.err.println("exception: "+e);
                }
        }
}