public SnapshotMethod Generate(AbstractSyntaxTreeNode studentNode, AbstractSyntaxTreeNode solutionNode, MethodDeclaration method)
{
var studentMethod = GetMethodOrDefault(studentNode, method);
var solutionMethod = GetMethodOrDefault(solutionNode, method);
if (studentMethod == null || solutionMethod == null)
{
return new SnapshotMethod()
{
Declared = false,
MethodDeclaration = method,
}
}
;
return(new SnapshotMethod()
{
Declared = true,
CodeAnalysisMetric = new CodeAnalysisMetric()
{
AbstractSyntaxTreeMetric = AbstractSyntaxTreeMetricCreator.Create(solutionMethod, studentMethod),
BagOfWordsMetric = BagOfWordsMetricCreator.Create(solutionMethod, studentMethod),
},
MethodDeclaration = method
});
}
private double CalculateMetricDistance(AbstractSyntaxTreeNode leftRoot, AbstractSyntaxTreeNode rightRoot, DevAssignment assignment, MarkovModelOptions options)
{
if (leftRoot == null && rightRoot == null)
{
return(0.0d);
}
var accumlator = 0.0d;
foreach (var methodDeclarration in assignment.Solution.MethodDeclarations)
{
var leftNode = leftRoot == null ? null : GetMethodOrDefault(leftRoot, methodDeclarration);
var rightNode = rightRoot == null ? null : GetMethodOrDefault(leftRoot, methodDeclarration);
if (leftNode != null && rightNode != null)
{
var abstractSyntaxTreeMetric = AbstractSyntaxTreeMetricCreator.Create(leftNode, rightNode);
var bagOfWordsMetric = BagOfWordsMetricCreator.Create(leftNode, rightNode);
accumlator += Math.Pow(abstractSyntaxTreeMetric.Rotations * options.AbstractSyntaxTreeWeight, 2);
accumlator += Math.Pow(abstractSyntaxTreeMetric.Insertations * options.AbstractSyntaxTreeWeight, 2);
accumlator += Math.Pow(abstractSyntaxTreeMetric.Deletions * options.AbstractSyntaxTreeWeight, 2);
accumlator += Math.Pow(bagOfWordsMetric.Difference * options.BagOfWordsWeight, 2);
}
else if (leftNode != null)
{
var amount = leftNode.NumberOfNodes();
accumlator += Math.Pow(amount * options.AbstractSyntaxTreeWeight, 2);
accumlator += Math.Pow(amount * options.BagOfWordsWeight, 2);
}
else if (rightNode != null)
{
var amount = rightNode.NumberOfNodes();
accumlator += Math.Pow(amount * options.AbstractSyntaxTreeWeight, 2);
accumlator += Math.Pow(amount * options.BagOfWordsWeight, 2);
}
}
return(accumlator);
}