Slides from presentation at Mojoconf. Discusses my Extract Method refactoring implementation for Perl.

1. REFACTORING TOOLS IN
PERL

2. WHAT IS REFACTORING
Refactoring is a
disciplined technique
for restructuring an
existing body of code,
altering its internal
structure without
changing its external
behavior

3. REFACTORING CATALOG
• ▶Add Parameter
• ▶Change Bidirectional
Association to Unidirectional
• ▶Change Reference to Value
• ▶Change Unidirectional
Association to Bidirectional
• ▶Change Value to Reference
• ▶Collapse Hierarchy
Expression
• ▶Consolidate Duplicate
Conditional Fragments
• ▶Decompose Conditional
• ▶Duplicate Observed Data
• ▶Dynamic Method Definition
• ▶Eagerly Initialized Attribute

4. THE GOALS
• Make code more readable and comprehensible
• Eliminate duplication

5. WHY?
• Lots of time is spent reading code
• Bugs hide in obscure code
• Duplication makes code rot
• LEARNING!

6. START OUT BRAINDEAD, GET
BETTER

7. TOOLS
?????

8. JAVA REFACTORING
In Eclipse

9. JAVASCRIPT
REFACTORING
In WebStorm

10. PERL REFACTORING

11. PPIx::EditorTools
• Supports Vim and Emacs
• RenameVariable (safe renaming)
• RenamePackageFromPath
• IntroduceTemporaryVariable

12. My extensions
• Supports Vim only
• ExtractMethod
• ConvertVarToAttribute

13. Why refactor long methods?
• Readability—make the essential logic clear
• Isolated testing
• Isolated editing
• Avoid comments getting out of sync

14. ARCHITECTURE
Analyzer
VariableSorter
CodeGenerator
CodeEditor

15. ANALYZER CLASSES

16. CURRENT STATUS
• Mostly safe with “normal”
code.
• No fancy installation
available
• Use the README at
https://github.com/dagfin
nr/perl-extract-method

17. • dagfinn@startsiden.no
• dagfinn@reiersol.com
• Github, Twitter (theoretically): dagfinnr