From 1a20505c4f0f5cdcf023b03eb0e80e6f1de7eadb Mon Sep 17 00:00:00 2001
From: Ichthyostega <prg@ichthyostega.de>
Date: Fri, 4 Mar 2016 21:38:39 +0100
Subject: [PATCH] implement src position and simple match operation

---
 src/lib/diff/test-mutation-target.hpp | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/lib/diff/test-mutation-target.hpp b/src/lib/diff/test-mutation-target.hpp
index 5866e35db..e41140efc 100644
--- a/src/lib/diff/test-mutation-target.hpp
+++ b/src/lib/diff/test-mutation-target.hpp
@@ -274,15 +274,20 @@ namespace diff{
         }
       
       
+      using iterator       = typename iter_stl::_SeqT<VecS>::Range;
       using const_iterator = typename iter_stl::_SeqT<const VecS>::Range;
       
       const_iterator begin() const { return iter_stl::eachElm(content_); }
       const_iterator end()   const { return const_iterator(); }
       
+      iterator srcIter()           {return iter_stl::eachElm(prev_content_); }
+      
+      
       friend const_iterator begin (TestMutationTarget const& target) { return target.begin(); }
       friend const_iterator end   (TestMutationTarget const& target) { return target.end(); }
       
       
+      
     private:
     };
   
@@ -314,12 +319,16 @@ namespace diff{
                                           : renderChild(n));
           }
         
-        /** ensure the next source element matches with given spec */
+        /** ensure the next recorded source element
+         *  matches on a formal level with given spec */
         virtual bool
-        matchSrc (GenNode const&)
+        matchSrc (GenNode const& n)
           {
-            UNIMPLEMENTED();
-            return false;
+            if (target_.emptySrc())
+              return false;
+            string spec{n.isNamed()? renderAttribute(n)
+                                   : renderChild(n) };
+            return spec == *pos_;
           }
         
         /** accept existing element, when matching the given spec */
@@ -342,12 +351,15 @@ namespace diff{
         TestWireTap(TestMutationTarget& dummy, PAR const& chain)
           : PAR(chain)
           , target_(dummy)
+          , pos_()
           {
             target_.initMutation (identify(this));
+            pos_ = target_.srcIter();
           }
         
       private:
         TestMutationTarget& target_;
+        TestMutationTarget::iterator pos_;
       };