1 files changed, 57 insertions, 0 deletions
diff --git a/lib/antlr/antlr/ASTPair.hpp b/lib/antlr/antlr/ASTPair.hpp
new file mode 100644
index 00000000..d6237902
--- /dev/null
+++ b/lib/antlr/antlr/ASTPair.hpp
@@ -0,0 +1,57 @@
+#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
+ *
+ * $Id$
+ */
+
+#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__