ASTPair.hpp
上传用户:afrynkmhm
上传日期:2007-01-06
资源大小:1262k
文件大小:3k
- #ifndef INC_ASTPair_hpp__
- #define INC_ASTPair_hpp__
- /**
- * <b>SOFTWARE RIGHTS</b>
- * <p>
- * ANTLR 2.6.0 MageLang Insitute, 1999
- * <p>
- * We reserve no legal rights to the ANTLR--it is fully in the
- * public domain. An individual or company may do whatever
- * they wish with source code distributed with ANTLR or the
- * code generated by ANTLR, including the incorporation of
- * ANTLR, or its output, into commerical software.
- * <p>
- * We encourage users to develop software with ANTLR. However,
- * we do ask that credit is given to us for developing
- * ANTLR. By "credit", we mean that if you use ANTLR or
- * incorporate any source code into one of your programs
- * (commercial product, research project, or otherwise) that
- * you acknowledge this fact somewhere in the documentation,
- * research report, etc... If you like ANTLR and have
- * developed a nice tool with the output, please mention that
- * you developed it using ANTLR. In addition, we ask that the
- * headers remain intact in our source code. As long as these
- * guidelines are kept, we expect to continue enhancing this
- * system and expect to make other tools available as they are
- * completed.
- * <p>
- * The ANTLR gang:
- * @version ANTLR 2.6.0 MageLang Insitute, 1999
- * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
- * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
- * @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
- */
- #include "antlr/config.hpp"
- #include "antlr/AST.hpp"
- ANTLR_BEGIN_NAMESPACE(antlr)
- /** 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 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+"]";
- }
- };
- ANTLR_END_NAMESPACE
- #endif //INC_ASTPair_hpp__