1. RefactorHub:
A Commit Annotator
for Refactoring
Ryo
Kuramoto
Shinpei
Hayashi
Motoshi
Saeki
TokyoTech.
Japan
github.com/
salab/RefactorHub

2. Empirical studies
on refactoring
We need
refactoring data

3. How to collect refactoring data
Using detection tools
(e.g.. RefactoringMiner, RefDiff)
Using self-affirmed commits
(commit message filtering)
f6f7e4d
refactor: extract printing name
and outstanding
f6f7e4d
Extract Method
✓ Accuracy
✗ Type coverage
✓ Detail information
✗ Accuracy
✓ Type coverage
✗ Detail information

4. RefactorHub:
A Commit Annotator for Refactoring

5. Annotation Approach
f6f7e4d
refactor: extract printing name and
outstanding
Input (Commit)
RefactorHub
extracted code
invocation
extracted method
{
"type": "ExtractMethod",
~
"extracted method": {
"type": "MethodDeclaration",
~
"path": "src/main/Printer.java",
"range": {
"startLine": 6, "startColumn": 2,
"endLine": 9, "endColumn": 3
~
Output (JSON)
✓ Accuracy
✓ Detail information
✗ Accuracy
✗ Detail information

6. Refactoring info.
Code difference
Modified files
Refactoring
parameters
(before refactoring)
Refactoring
parameters
(after refactoring)

7. Annotating
Extract
Method
Before:
• extracted
code
• target
method
After:
• extracted
code
• invocation
• extracted
method
• target
method

8. Annotating
Extract
Method
Before:
• extracted
code
• target
method
After:
• extracted
code
• invocation
• extracted
method
• target
method

9. Annotating
Extract
Method
Before:
• extracted
code
• target
method
After:
• extracted
code
• invocation
• extracted
method
• target
method

10. RefactorHub:
A Commit Annotator
for Refactoring
Ryo
Kuramoto
Shinpei
Hayashi
Motoshi
Saeki
TokyoTech.
Japan
github.com/
salab/RefactorHub