1#ifndef INC_ASTPair_hpp__
2#define INC_ASTPair_hpp__
3
4/* ANTLR Translator Generator
5 * Project led by Terence Parr at http://www.jGuru.com
6 * Software rights: http://www.antlr.org/license.html
7 *
8 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/ASTPair.hpp#2 $
9 */
10
11#include <antlr/config.hpp>
12#include <antlr/AST.hpp>
13
14#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
15namespace antlr {
16#endif
17
18/** ASTPair:  utility class used for manipulating a pair of ASTs
19  * representing the current AST root and current AST sibling.
20  * This exists to compensate for the lack of pointers or 'var'
21  * arguments in Java.
22  *
23  * OK, so we can do those things in C++, but it seems easier
24  * to stick with the Java way for now.
25  */
26class ANTLR_API ASTPair {
27public:
28	RefAST root;		// current root of tree
29	RefAST child;		// current child to which siblings are added
30
31	/** Make sure that child is the last sibling */
32	void advanceChildToEnd() {
33		if (child) {
34			while (child->getNextSibling()) {
35				child = child->getNextSibling();
36			}
37		}
38	}
39//	/** Copy an ASTPair.  Don't call it clone() because we want type-safety */
40//	ASTPair copy() {
41//		ASTPair tmp = new ASTPair();
42//		tmp.root = root;
43//		tmp.child = child;
44//		return tmp;
45//	}
46	ANTLR_USE_NAMESPACE(std)string toString() const {
47		ANTLR_USE_NAMESPACE(std)string r = !root ? ANTLR_USE_NAMESPACE(std)string("null") : root->getText();
48		ANTLR_USE_NAMESPACE(std)string c = !child ? ANTLR_USE_NAMESPACE(std)string("null") : child->getText();
49		return "["+r+","+c+"]";
50	}
51};
52
53#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
54}
55#endif
56
57#endif //INC_ASTPair_hpp__
58