Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Write ruby code to change ruby code
Search
flyerhzm
September 19, 2014
Programming
5
3.6k
Write ruby code to change ruby code
flyerhzm
September 19, 2014
Tweet
Share
More Decks by flyerhzm
See All by flyerhzm
玩转 AST
flyerhzm
0
230
Find and Replace Code based on AST
flyerhzm
0
330
Rails Performance Tips
flyerhzm
0
1.2k
Refactor ruby code based on AST
flyerhzm
4
3.7k
基于AST的代码优化
flyerhzm
10
840
Building Asynchronous APIs
flyerhzm
25
9k
构建异步API服务
flyerhzm
19
7.3k
JRuby @ OpenFeint
flyerhzm
23
3.2k
Other Decks in Programming
See All in Programming
設計やレビューに悩んでいるPHPerに贈る、クリーンなオブジェクト設計の指針たち
panda_program
6
2.3k
ソフトウェア品質を数字で捉える技術。事業成長を支えるシステム品質の マネジメント
takuya542
2
14k
A full stack side project webapp all in Kotlin (KotlinConf 2025)
dankim
0
130
PHP 8.4の新機能「プロパティフック」から学ぶオブジェクト指向設計とリスコフの置換原則
kentaroutakeda
2
990
Deep Dive into ~/.claude/projects
hiragram
14
7.2k
Azure AI Foundryではじめてのマルチエージェントワークフロー
seosoft
0
190
20250704_教育事業におけるアジャイルなデータ基盤構築
hanon52_
5
880
チームのテスト力を総合的に鍛えて品質、スピード、レジリエンスを共立させる/Testing approach that improves quality, speed, and resilience
goyoki
5
990
AI時代の『改訂新版 良いコード/悪いコードで学ぶ設計入門』 / ai-good-code-bad-code
minodriven
21
8.7k
RailsGirls IZUMO スポンサーLT
16bitidol
0
190
おやつのお供はお決まりですか?@WWDC25 Recap -Japan-\(region).swift
shingangan
0
140
LT 2025-06-30: プロダクトエンジニアの役割
yamamotok
0
800
Featured
See All Featured
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Faster Mobile Websites
deanohume
307
31k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Raft: Consensus for Rubyists
vanstee
140
7k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
8
700
Art, The Web, and Tiny UX
lynnandtonic
299
21k
Code Review Best Practice
trishagee
69
19k
The Language of Interfaces
destraynor
158
25k
Java REST API Framework Comparison - PWX 2021
mraible
31
8.7k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
740
Done Done
chrislema
184
16k
Transcript
Write ruby code to change ruby code Richard Huang Xinmin
Labs
About Me Founder at Xinmin Labs Full Stack Developer Open
Source Enthusiast @flyerhzm
Problem
Hey, let’s use rspec new syntax for project A Yes,
sure, I love the rspec new syntax
Hey, let’s use rspec new syntax for project B Hmmm…ok
Hey, let’s use rspec new syntax for project C Oh,
no, I don’t want to repeat it again
Developers love upgrading and refactoring code
Developers hate changing code again and again
Automation
Metric Tools
Metric Tools • cane - fails your build if code
quality thresholds are not met • reek - is a tool that examines Ruby classes, modules and methods and reports any code smells it finds. • rails_best_practices - is a tool to check the quality of rails code. • ……
Tell you what to do, but can’t do for you
IDE
IDE • can rename class / method / variable name
• can extract methods • can ……
IDE • can’t customize
Based on text
Based on text Replace FactoryGirl.create with create ! $ sed
-i '' 's/FactoryGirl.create/create/g' spec/**/*.rb
Based on text Replace FactoryGirl.create with create ! !
Based on text Hard to be accurate ! ! !
!
Based on text Hard to convert complicated cases ! !
! !
Based on AST
What’s AST AST is short for Abstract Syntax Tree
What’s AST
Why AST It is much more accurate to parse ruby
code.
None
None
How to use AST • ripper • ParseTree - https://github.com/seattlerb/parsetree
• ruby_parser - https://github.com/seattlerb/ruby_parser • parser - https://github.com/whitequark/parser
How to use AST
Example transpec - https://github.com/yujinakayama/ transpec
None
Based on AST Accurate, but hard to write and read
Synvert https://github.com/xinminlabs/synvert
Demo http://xinminlabs.github.io/synvert/
None
Synvert • Add useful attributes to AST nodes ! •
Provide DSL to parse and rewrite code
Attributes for AST node
Attributes for AST node
Attributes for AST node
Attributes for AST node Check out more attributes http://xinminlabs.github.io/synvert/rules/
DSL • within_file / within_files • with_node / within_node •
if_exist_node / unless_exist_node • append / insert / insert_after / replace_with / remove • ……
DSL Check out more DSL http://xinminlabs.github.io/synvert/dsl/
None
Playground http://synvert-tools.herokuapp.com/
Snippets https://github.com/xinminlabs/synvert-snippets
Want more? • Fork and send pull request • Open
issues on github • Hire us to refactor your project
Q&A ! Thank you