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
15 namespace 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   */
26 class ANTLR_API ASTPair {
27 public:
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 */
advanceChildToEnd()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 //	}
ANTLR_USE_NAMESPACE(std)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