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78 lines
2.7 KiB
78 lines
2.7 KiB
#ifndef INC_ASTPair_hpp__
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#define INC_ASTPair_hpp__
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/**
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* <b>SOFTWARE RIGHTS</b>
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* <p>
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* ANTLR 2.6.0 MageLang Insitute, 1999
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* <p>
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* We reserve no legal rights to the ANTLR--it is fully in the
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* public domain. An individual or company may do whatever
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* they wish with source code distributed with ANTLR or the
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* code generated by ANTLR, including the incorporation of
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* ANTLR, or its output, into commerical software.
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* <p>
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* We encourage users to develop software with ANTLR. However,
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* we do ask that credit is given to us for developing
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* ANTLR. By "credit", we mean that if you use ANTLR or
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* incorporate any source code into one of your programs
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* (commercial product, research project, or otherwise) that
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* you acknowledge this fact somewhere in the documentation,
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* research report, etc... If you like ANTLR and have
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* developed a nice tool with the output, please mention that
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* you developed it using ANTLR. In addition, we ask that the
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* headers remain intact in our source code. As long as these
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* guidelines are kept, we expect to continue enhancing this
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* system and expect to make other tools available as they are
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* completed.
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* <p>
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* The ANTLR gang:
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* @version ANTLR 2.6.0 MageLang Insitute, 1999
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* @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
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* @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
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* @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
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*/
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#include "antlr/config.h"
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#include "antlr/AST.h"
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ANTLR_BEGIN_NAMESPACE(antlr)
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/** ASTPair: utility class used for manipulating a pair of ASTs
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* representing the current AST root and current AST sibling.
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* This exists to compensate for the lack of pointers or 'var'
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* arguments in Java.
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*
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* OK, so we can do those things in C++, but it seems easier
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* to stick with the Java way for now.
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*/
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class ASTPair {
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public:
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RefAST root; // current root of tree
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RefAST child; // current child to which siblings are added
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/** Make sure that child is the last sibling */
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void advanceChildToEnd() {
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if (child) {
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while (child->getNextSibling()) {
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child = child->getNextSibling();
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}
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}
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}
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// /** Copy an ASTPair. Don't call it clone() because we want type-safety */
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// ASTPair copy() {
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// ASTPair tmp = new ASTPair();
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// tmp.root = root;
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// tmp.child = child;
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// return tmp;
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// }
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ANTLR_USE_NAMESPACE(std)string toString() const {
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ANTLR_USE_NAMESPACE(std)string r = !root ? ANTLR_USE_NAMESPACE(std)string("null") : root->getText();
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ANTLR_USE_NAMESPACE(std)string c = !child ? ANTLR_USE_NAMESPACE(std)string("null") : child->getText();
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return "["+r+","+c+"]";
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}
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};
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ANTLR_END_NAMESPACE
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#endif //INC_ASTPair_hpp__
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