Pick one way to extract method changes

[yiming-tang-cs]

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1. Using AST differences. Once we get the AST differences, we increase the DOI of the method.
   Pros.
   We only need to consider the code changes instead of the non-code changes.
   We do not care about the ordering of the methods in the class.
   Cons.
   It's exspensive to implement and use, espeacially for a large project.
   No matter how many lines of code changes in a method, the DOI value is only modified once.

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2. Using line differences. For each line deleted or added, the DOI value of the method which includes that line is modified.
   Pros.
   Easier to implement.
   It's effective.
   Like mylyn plugin, it also considers the non code changes, such as whitespace.
   Cons.
   If the developers sort the methods, the DOI values could be modified a lot. Actually, sorting the methods should not change the DOI values of the methods.

┆Issue is synchronized with this Asana task

[yiming-tang-cs]

I am using line differences now. How can we process comments? The comments above the method should be considered as part of the method? Right?

[khatchad]

Sorry, is this related to #39?

[yiming-tang-cs]

Sorry, is this related to #39?

Yes.

[khatchad]

We picked the second one and use edit differences.