public HashSet <ArmadaPC> AssumeIntro(Dictionary <ArmadaPC, ArmadaPC> pcMap)
{
Diff();
HashSet <ArmadaPC> assumeIntroduced = new HashSet <ArmadaPC>();
// introduced assume statements should not be mapped from any low-level assume statement
foreach (var pair in map)
{
if (pair.Value != null &&
pair.Key.startPC != null && pair.Key.endPC != null &&
pair.Value.startPC != null && pair.Value.endPC != null)
{
if (pcMap.ContainsKey(pair.Key.startPC) && pcMap[pair.Key.startPC] != pair.Value.startPC)
{
}
else
{
pcMap[pair.Key.startPC] = pair.Value.startPC;
}
if (pcMap.ContainsKey(pair.Key.endPC) && pcMap[pair.Key.endPC] != pair.Value.endPC)
{
}
else
{
pcMap[pair.Key.endPC] = pair.Value.endPC;
}
}
}
foreach (var node in ASTHelper.Traverse(tgt, false, true))
{
if (!map.ContainsValue(node))
{
// this statement is not in the map, therefore it should be an assume statement
if ((node.Flags & ASTFlag.ASSUME) != ASTFlag.ASSUME)
{
Console.WriteLine($"{node.TraverseId} is not in the map, but not an assume statement");
}
else
{
assumeIntroduced.Add(node.startPC);
assumeIntroduced.Add(node.endPC);
}
}
}
return(assumeIntroduced);
}
public void Diff()
{
ASTHelper.InitId(this.src);
ASTHelper.InitId(this.tgt);
TopDown();
bottomUp();
foreach (var srcNode in ASTHelper.Traverse(src))
{
if (!map.ContainsKey(srcNode))
{
unmatched.Add(srcNode);
map.Add(srcNode, null);
}
}
}
private IEnumerable <ASTNode> FindCandidates(ASTNode node, ASTNode root)
{
foreach (var candidate in ASTHelper.Traverse(root))
{
if (candidate.Value == node.Value && !map.ContainsValue(candidate))
{
foreach (var child in node.EnumerateChildren)
{
if (map.ContainsKey(child) && map[child].parent == candidate)
{
yield return(candidate);
break;
}
}
}
}
}
private void bottomUp()
{
foreach (var node in ASTHelper.Traverse(src, true))
{
if (!map.ContainsKey(node))
{
bool flag = false;
foreach (var child in node.EnumerateChildren)
{
if (map.ContainsKey(child))
{
flag = true;
break;
}
}
if (flag)
{
List <ASTNode> candidates = FindCandidates(node, tgt).ToList();
double dice = 0;
ASTNode elected = null;
foreach (var candidate in candidates)
{
double temp = Dice(node, candidate, map);
if (temp > dice)
{
elected = candidate;
dice = temp;
}
}
if (elected != null && dice > 0.5)
{
map.Add(node, elected);
// TODO(luke): For transformation-specific algorithms
}
else if (elected != null)
{
Console.WriteLine($"{elected.TraverseId} elected for {node.TraverseId}, but dice=${dice} failed");
}
}
}
}
}
// calculate the weight function
private double Dice(ASTNode src, ASTNode tgt, IDictionary <ASTNode, ASTNode> map)
{
int denominator = 0, numerator = 0;
foreach (var srcNode in ASTHelper.Traverse(src))
{
foreach (var tgtNode in ASTHelper.Traverse(tgt))
{
if (map.ContainsKey(srcNode) && Object.ReferenceEquals(map[srcNode], tgtNode))
{
++numerator;
}
}
}
denominator = ASTHelper.Traverse(src).Count() + ASTHelper.Traverse(tgt).Count() - 2; // deleting themselves
return(2.0 * ((double)numerator) / ((double)denominator));
}
// Top-Down(preOrder) scan of the AST tree, finish course matches
private void TopDown()
{
var prioritySrc = new SortedSet <ASTNode>();
var priorityTgt = new SortedSet <ASTNode>();
var candidates = new List <Tuple <ASTNode, ASTNode> >();
prioritySrc.Add(this.src);
priorityTgt.Add(this.tgt);
while (Math.Min(prioritySrc.Max()?.Height ?? -1, priorityTgt.Max()?.Height ?? -1) > minHeight)
{
if (prioritySrc.Max().Height != priorityTgt.Max().Height)
{
if (prioritySrc.Max().Height > priorityTgt.Max().Height)
{
var maxList = Pop(prioritySrc);
Open(prioritySrc, maxList);
}
else
{
var maxList = Pop(priorityTgt);
Open(priorityTgt, maxList);
}
}
else
{
var srcList = Pop(prioritySrc);
var tgtList = Pop(priorityTgt);
foreach (var srcNode in srcList)
{
foreach (var tgtNode in tgtList)
{
if (Isomorphic(srcNode, tgtNode))
{
bool flag = false;
foreach (var node in ASTHelper.Traverse(tgt))
{
if (Isomorphic(srcNode, node) && tgtNode.TraverseId != node.TraverseId)
{
flag = true;
break;
}
}
if (!flag)
{
foreach (var node in ASTHelper.Traverse(src))
{
if (Isomorphic(node, tgtNode) && srcNode.TraverseId != node.TraverseId)
{
flag = true;
break;
}
}
}
if (!flag)
{
map.Add(srcNode, tgtNode);
}
else
{
candidates.Add(Tuple.Create(srcNode, tgtNode));
}
}
}
}
Open(prioritySrc, srcList);
Open(priorityTgt, tgtList);
}
}
candidates = new List <Tuple <ASTNode, ASTNode> >(candidates.OrderBy(tuple => {
if (tuple.Item1.parent == null || tuple.Item2.parent == null) // TODO(luke): what about root?
{
return(Dice(tuple.Item1, tuple.Item2, map));
}
else
{
return(Dice(tuple.Item1.parent, tuple.Item2.parent, map));
}
}).Where(tuple => Dice(tuple.Item1.parent, tuple.Item2.parent, map) > 0));
while (candidates.Count() > 0)
{
var pair = candidates.Last();
var src = pair.Item1;
var tgt = pair.Item2;
foreach (var srcNode in ASTHelper.Traverse(src))
{
foreach (var tgtNode in ASTHelper.Traverse(tgt))
{
if (Isomorphic(srcNode, tgtNode) && !map.ContainsKey(srcNode) && !map.ContainsValue(tgtNode))
{
map.Add(srcNode, tgtNode);
}
}
}
candidates.RemoveAt(candidates.Count() - 1);
}
}