REFACTORING TOOLS IN PERL

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

REFACTORING CATALOG

• ▶Add Parameter

• ▶Change Bidirectional Association to Unidirectional

• ▶Change Reference to Value

• ▶Change Unidirectional Association to Bidirectional

• ▶Change Value to Reference

• ▶Collapse Hierarchy

• ▶Consolidate Conditional Expression

• ▶Consolidate Duplicate Conditional Fragments

• ▶Decompose Conditional

• ▶Duplicate Observed Data

• ▶Dynamic Method Definition

• ▶Eagerly Initialized Attribute

• ▶Encapsulate Collection

THE GOALS

• Make code more readable and comprehensible

• Eliminate duplication

WHY?

• Lots of time is spent reading code

• Bugs hide in obscure code

• Duplication makes code rot

• LEARNING!

START OUT BRAINDEAD, GET BETTER

TOOLS?????

JAVA REFACTORINGIn Eclipse

JAVASCRIPT REFACTORINGIn WebStorm

PERL REFACTORING

PPIx::EditorTools

• Supports Vim and Emacs

• RenameVariable (safe renaming)

• RenamePackageFromPath

• IntroduceTemporaryVariable

My extensions

• Supports Vim only

• ExtractMethod

• ConvertVarToAttribute

Why refactor long methods?

• Readability—make the essential logic clear

• Isolated testing

• Isolated editing

• Avoid comments getting out of sync

ARCHITECTUREAnalyzer

VariableSorter

CodeGenerator

CodeEditor

ANALYZER CLASSES

CURRENT STATUS

• Mostly safe with “normal” code.

• No fancy installation available

• Use the README athttps://github.com/dagfinnr/perl-extract-method

• dagfinn@startsiden.no

• dagfinn@reiersol.com

• Github, Twitter (theoretically): dagfinnr