2 files changed, 76 insertions, 0 deletions

diff --git a/indra/llui/llui.cpp b/indra/llui/llui.cpp
index c300fe55d9..87669574c2 100644
--- a/indra/llui/llui.cpp
+++ b/indra/llui/llui.cpp
@@ -61,6 +61,8 @@
 // for XUIParse
 #include "llquaternion.h"
 #include <boost/tokenizer.hpp>
+#include <boost/algorithm/string/find_iterator.hpp>
+#include <boost/algorithm/string/finder.hpp>
 
 //
 // Globals
@@ -2020,6 +2022,53 @@ void LLUI::positionViewNearMouse(LLView* view, S32 spawn_x, S32 spawn_y)
 	view->translateIntoRectWithExclusion( virtual_window_rect, mouse_rect, FALSE );
 }
 
+LLView* LLUI::resolvePath(LLView* context, const std::string& path)
+{
+	// Nothing about resolvePath() should require non-const LLView*. If caller
+	// wants non-const, call the const flavor and then cast away const-ness.
+	return const_cast<LLView*>(resolvePath(const_cast<const LLView*>(context), path));
+}
+
+const LLView* LLUI::resolvePath(const LLView* context, const std::string& path)
+{
+	// Create an iterator over slash-separated parts of 'path'. Dereferencing
+	// this iterator returns an iterator_range over the substring. Unlike
+	// LLStringUtil::getTokens(), this split_iterator doesn't combine adjacent
+	// delimiters: leading/trailing slash produces an empty substring, double
+	// slash produces an empty substring. That's what we need.
+	boost::split_iterator<std::string::const_iterator> ti(path, boost::first_finder("/")), tend;
+
+	if (ti == tend)
+	{
+		// 'path' is completely empty, no navigation
+		return context;
+	}
+
+	// leading / means "start at root"
+	if (ti->empty())
+	{
+		context = getRootView();
+		++ti;
+	}
+
+	bool recurse = false;
+	for (; ti != tend && context; ++ti)
+	{
+		if (ti->empty()) 
+		{
+			recurse = true;
+		}
+		else
+		{
+			std::string part(ti->begin(), ti->end());
+			context = context->findChildView(part, recurse);
+			recurse = false;
+		}
+	}
+
+	return context;
+}
+
 
 // LLLocalClipRect and LLScreenClipRect moved to lllocalcliprect.h/cpp
 
diff --git a/indra/llui/llui.h b/indra/llui/llui.h
index 62d10df8b2..50cb9e6632 100644
--- a/indra/llui/llui.h
+++ b/indra/llui/llui.h
@@ -185,6 +185,33 @@ public:
 	//helper functions (should probably move free standing rendering helper functions here)
 	static LLView* getRootView() { return sRootView; }
 	static void setRootView(LLView* view) { sRootView = view; }
+	/**
+	 * Walk the LLView tree to resolve a path
+	 * Paths can be discovered using Develop > XUI > Show XUI Paths
+	 *
+	 * A leading "/" indicates the root of the tree is the starting
+	 * position of the search, (otherwise the context node is used)
+	 *
+	 * Adjacent "//" mean that the next level of the search is done
+	 * recursively ("descendant" rather than "child").
+	 *
+	 * Return values: If no match is found, NULL is returned,
+	 * otherwise the matching LLView* is returned.
+	 *
+	 * Examples:
+	 *
+	 * "/" -> return the root view
+	 * "/foo" -> find "foo" as a direct child of the root
+	 * "foo" -> find "foo" as a direct child of the context node
+	 * "//foo" -> find the first "foo" child anywhere in the tree
+	 * "/foo/bar" -> find "foo" as direct child of the root, and
+	 *      "bar" as a direct child of "foo"
+	 * "//foo//bar/baz" -> find the first "foo" anywhere in the
+	 *      tree, the first "bar" anywhere under it, and "baz"
+	 *      as a direct child of that
+	 */
+	static const LLView* resolvePath(const LLView* context, const std::string& path);
+	static LLView* resolvePath(LLView* context, const std::string& path);
 	static std::string locateSkin(const std::string& filename);
 	static void setMousePositionScreen(S32 x, S32 y);
 	static void getMousePositionScreen(S32 *x, S32 *y);