cmState: Clarify name of member tracking the active scope in a directory

The `DirectoryEnd` member added by commit 52dbe654de (cmState: Record
the end position of each directory., 2015-08-01, v3.4.0-rc1~251^2~1)
actually tracks the current top-most scope in a directory's stack.  This
is evidenced by the use case in commit 3f4e5e8c3d (cmState: Return end
snapshot for GetBuildsystemDirectoryParent., 2015-09-01,
v3.4.0-rc1~100^2~1).  Rename the member to `CurrentScope` to clarify
this role.

Source/cmState.cxx

@@ -281,7 +281,7 @@ cmStateSnapshot cmState::Reset()
     it->CompileOptions.clear();
     it->LinkOptions.clear();
     it->LinkDirectories.clear();
-    it->DirectoryEnd = pos;
+    it->CurrentScope = pos;
     it->NormalTargetNames.clear();
     it->ImportedTargetNames.clear();
     it->Properties.Clear();
@@ -819,7 +819,7 @@ cmStateSnapshot cmState::CreateBaseSnapshot()
   pos->CompileOptionsPosition = 0;
   pos->LinkOptionsPosition = 0;
   pos->LinkDirectoriesPosition = 0;
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->Policies = this->PolicyStack.Root();
   pos->PolicyRoot = this->PolicyStack.Root();
   pos->PolicyScope = this->PolicyStack.Root();
@@ -846,7 +846,7 @@ cmStateSnapshot cmState::CreateBuildsystemDirectorySnapshot(
     originSnapshot.Position->BuildSystemDirectory);
   pos->ExecutionListFile =
     this->ExecutionListFiles.Push(originSnapshot.Position->ExecutionListFile);
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->Policies = originSnapshot.Position->Policies;
   pos->PolicyRoot = originSnapshot.Position->Policies;
   pos->PolicyScope = originSnapshot.Position->Policies;
@@ -876,7 +876,7 @@ cmStateSnapshot cmState::CreateDeferCallSnapshot(
   pos->ExecutionListFile = this->ExecutionListFiles.Push(
     originSnapshot.Position->ExecutionListFile, fileName);
   assert(originSnapshot.Position->Vars.IsValid());
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   return { this, pos };
 }
@@ -891,7 +891,7 @@ cmStateSnapshot cmState::CreateFunctionCallSnapshot(
   pos->Keep = false;
   pos->ExecutionListFile = this->ExecutionListFiles.Push(
     originSnapshot.Position->ExecutionListFile, fileName);
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   assert(originSnapshot.Position->Vars.IsValid());
   cmLinkedTree<cmDefinitions>::iterator origin = originSnapshot.Position->Vars;
@@ -910,7 +910,7 @@ cmStateSnapshot cmState::CreateMacroCallSnapshot(
   pos->ExecutionListFile = this->ExecutionListFiles.Push(
     originSnapshot.Position->ExecutionListFile, fileName);
   assert(originSnapshot.Position->Vars.IsValid());
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   return { this, pos };
 }
@@ -925,7 +925,7 @@ cmStateSnapshot cmState::CreateIncludeFileSnapshot(
   pos->ExecutionListFile = this->ExecutionListFiles.Push(
     originSnapshot.Position->ExecutionListFile, fileName);
   assert(originSnapshot.Position->Vars.IsValid());
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   return { this, pos };
 }
@@ -938,7 +938,7 @@ cmStateSnapshot cmState::CreateVariableScopeSnapshot(
   pos->ScopeParent = originSnapshot.Position;
   pos->SnapshotType = cmStateEnums::VariableScopeType;
   pos->Keep = false;
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   assert(originSnapshot.Position->Vars.IsValid());
 
@@ -958,7 +958,7 @@ cmStateSnapshot cmState::CreateInlineListFileSnapshot(
   pos->Keep = true;
   pos->ExecutionListFile = this->ExecutionListFiles.Push(
     originSnapshot.Position->ExecutionListFile, fileName);
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   return { this, pos };
 }
@@ -970,7 +970,7 @@ cmStateSnapshot cmState::CreatePolicyScopeSnapshot(
     this->SnapshotData.Push(originSnapshot.Position, *originSnapshot.Position);
   pos->SnapshotType = cmStateEnums::PolicyScopeType;
   pos->Keep = false;
-  pos->BuildSystemDirectory->DirectoryEnd = pos;
+  pos->BuildSystemDirectory->CurrentScope = pos;
   pos->PolicyScope = originSnapshot.Position->Policies;
   return { this, pos };
 }
@@ -990,7 +990,7 @@ cmStateSnapshot cmState::Pop(cmStateSnapshot const& originSnapshot)
     prevPos->BuildSystemDirectory->LinkOptions.size();
   prevPos->LinkDirectoriesPosition =
     prevPos->BuildSystemDirectory->LinkDirectories.size();
-  prevPos->BuildSystemDirectory->DirectoryEnd = prevPos;
+  prevPos->BuildSystemDirectory->CurrentScope = prevPos;
 
   if (!pos->Keep && this->SnapshotData.IsLast(pos)) {
     if (pos->Vars != prevPos->Vars) {

Source/cmStatePrivate.h

@@ -62,7 +62,7 @@ struct cmStateDetail::PolicyStackEntry : public cmPolicies::PolicyMap
 
 struct cmStateDetail::BuildsystemDirectoryStateType
 {
-  cmStateDetail::PositionType DirectoryEnd;
+  cmStateDetail::PositionType CurrentScope;
 
   std::string Location;
   std::string OutputLocation;

Source/cmStateSnapshot.cxx

@@ -64,7 +64,7 @@ bool cmStateSnapshot::IsValid() const
 
 cmStateSnapshot cmStateSnapshot::GetBuildsystemDirectory() const
 {
-  return { this->State, this->Position->BuildSystemDirectory->DirectoryEnd };
+  return { this->State, this->Position->BuildSystemDirectory->CurrentScope };
 }
 
 cmStateSnapshot cmStateSnapshot::GetBuildsystemDirectoryParent() const
@@ -76,7 +76,7 @@ cmStateSnapshot cmStateSnapshot::GetBuildsystemDirectoryParent() const
   cmStateDetail::PositionType parentPos = this->Position->DirectoryParent;
   if (parentPos != this->State->SnapshotData.Root()) {
     snapshot = cmStateSnapshot(this->State,
-                               parentPos->BuildSystemDirectory->DirectoryEnd);
+                               parentPos->BuildSystemDirectory->CurrentScope);
   }
 
   return snapshot;
@@ -177,9 +177,9 @@ cmPolicies::PolicyStatus cmStateSnapshot::GetPolicy(cmPolicies::PolicyID id,
   while (true) {
     assert(dir.IsValid());
     cmLinkedTree<cmStateDetail::PolicyStackEntry>::iterator leaf =
-      dir->DirectoryEnd->Policies;
+      dir->CurrentScope->Policies;
     cmLinkedTree<cmStateDetail::PolicyStackEntry>::iterator root =
-      dir->DirectoryEnd->PolicyRoot;
+      dir->CurrentScope->PolicyRoot;
     for (; leaf != root; ++leaf) {
       if (parent_scope) {
         parent_scope = false;
@@ -190,7 +190,7 @@ cmPolicies::PolicyStatus cmStateSnapshot::GetPolicy(cmPolicies::PolicyID id,
         return status;
       }
     }
-    cmStateDetail::PositionType e = dir->DirectoryEnd;
+    cmStateDetail::PositionType e = dir->CurrentScope;
     cmStateDetail::PositionType p = e->DirectoryParent;
     if (p == this->State->SnapshotData.Root()) {
       break;