source: trunk/yao/share/antlr-2.7.7/lib/cpp/antlr/ASTPair.hpp @ 1

#ifndef INC_ASTPair_hpp__
#define INC_ASTPair_hpp__

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/ASTPair.hpp#2 $
 */

#include <antlr/config.hpp>
#include <antlr/AST.hpp>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

/** ASTPair:  utility class used for manipulating a pair of ASTs
  * representing the current AST root and current AST sibling.
  * This exists to compensate for the lack of pointers or 'var'
  * arguments in Java.
  *
  * OK, so we can do those things in C++, but it seems easier
  * to stick with the Java way for now.
  */
class ANTLR_API ASTPair {
public:
        RefAST root;            // current root of tree
        RefAST child;           // current child to which siblings are added

        /** Make sure that child is the last sibling */
        void advanceChildToEnd() {
                if (child) {
                        while (child->getNextSibling()) {
                                child = child->getNextSibling();
                        }
                }
        }
//      /** Copy an ASTPair.  Don't call it clone() because we want type-safety */
//      ASTPair copy() {
//              ASTPair tmp = new ASTPair();
//              tmp.root = root;
//              tmp.child = child;
//              return tmp;
//      }
        ANTLR_USE_NAMESPACE(std)string toString() const {
                ANTLR_USE_NAMESPACE(std)string r = !root ? ANTLR_USE_NAMESPACE(std)string("null") : root->getText();
                ANTLR_USE_NAMESPACE(std)string c = !child ? ANTLR_USE_NAMESPACE(std)string("null") : child->getText();
                return "["+r+","+c+"]";
        }
};

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_ASTPair_hpp__