X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flibr2c2%2Ftrackiter.cpp;h=64d223e21cc3ce6142061ab7efc670e3fbd715f5;hb=32316772d422223827833366a7ee2d0a76d76ff1;hp=c636d27c84cef8a30d6c700bb6fd454c9d49c9e0;hpb=ac3bd4db7b4d639488e05dab7d8316182f5368c7;p=r2c2.git

diff --git a/source/libr2c2/trackiter.cpp b/source/libr2c2/trackiter.cpp
index c636d27..64d223e 100644
--- a/source/libr2c2/trackiter.cpp
+++ b/source/libr2c2/trackiter.cpp
@@ -1,4 +1,5 @@
 #include <algorithm>
+#include "blockiter.h"
 #include "track.h"
 #include "trackiter.h"
 #include "tracktype.h"
@@ -21,6 +22,40 @@ TrackIter::TrackIter(Track *t, unsigned e):
 		throw out_of_range("TrackIter::TrackIter");
 }
 
+BlockIter TrackIter::block_iter() const
+{
+	if(!_track)
+		return BlockIter();
+
+	Block &block = _track->get_block();
+	const vector<Block::Endpoint> &beps = block.get_endpoints();
+
+	if(_track->get_type().is_turnout())
+	{
+		/* A turnouts is the only track in its block.  Go ahead and find the
+		matching endpoint in the block. */
+		for(unsigned i=0; i<beps.size(); ++i)
+			if(beps[i].track==_track && beps[i].track_ep==_entry)
+				return BlockIter(&block, i);
+	}
+	else
+	{
+		TrackIter rev = reverse();
+		while(rev && &rev.track()->get_block()==&block)
+		{
+			TrackIter fwd = rev.reverse();
+
+			for(unsigned i=0; i<beps.size(); ++i)
+				if(beps[i].track==fwd.track() && beps[i].track_ep==fwd.entry())
+					return BlockIter(&block, i);
+
+			rev = rev.next();
+		}
+	}
+
+	throw logic_error("internal error (didn't find block entry endpoint)");
+}
+
 const TrackType::Endpoint &TrackIter::endpoint() const
 {
 	if(!_track)