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
Let’s Create An Interpreter In Go
Search
Kenshi Kamata
November 05, 2017
Programming
0
140
Let’s Create An Interpreter In Go
Go Conference 2017 Autumn
Kenshi Kamata
November 05, 2017
Tweet
Share
More Decks by Kenshi Kamata
See All by Kenshi Kamata
500万ユーザーを支える残高の冪等性 / The idempotency of the balance for 5 million Merpay users
knsh14
0
2.8k
チャネルの仕組み
knsh14
6
5.4k
Go1.10 strings.Builder の紹介
knsh14
2
1.4k
Go でインタプリタを 書いてみよう
knsh14
0
2.9k
Go Code Review Comment を翻訳した話
knsh14
0
7.5k
tvOS Leaderboard
knsh14
0
1.2k
Other Decks in Programming
See All in Programming
はじめてのMaterial3 Expressive
ym223
2
840
AIを活用し、今後に備えるための技術知識 / Basic Knowledge to Utilize AI
kishida
22
5.8k
「手軽で便利」に潜む罠。 Popover API を WCAG 2.2の視点で安全に使うには
taitotnk
0
870
テストコードはもう書かない:JetBrains AI Assistantに委ねる非同期処理のテスト自動設計・生成
makun
0
360
時間軸から考えるTerraformを使う理由と留意点
fufuhu
16
4.8k
Flutter with Dart MCP: All You Need - 박제창 2025 I/O Extended Busan
itsmedreamwalker
0
150
為你自己學 Python - 冷知識篇
eddie
1
350
CJK and Unicode From a PHP Committer
youkidearitai
PRO
0
110
Navigation 2 を 3 に移行する(予定)ためにやったこと
yokomii
0
300
Tool Catalog Agent for Bedrock AgentCore Gateway
licux
6
2.5k
複雑なフォームに立ち向かう Next.js の技術選定
macchiitaka
2
160
Processing Gem ベースの、2D レトロゲームエンジンの開発
tokujiros
2
130
Featured
See All Featured
Building Applications with DynamoDB
mza
96
6.6k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
840
Speed Design
sergeychernyshev
32
1.1k
Git: the NoSQL Database
bkeepers
PRO
431
66k
Imperfection Machines: The Place of Print at Facebook
scottboms
268
13k
The Power of CSS Pseudo Elements
geoffreycrofte
77
6k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Become a Pro
speakerdeck
PRO
29
5.5k
Rails Girls Zürich Keynote
gr2m
95
14k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.6k
jQuery: Nuts, Bolts and Bling
dougneiner
64
7.9k
Transcript
Let’s Create An Interpreter In Go Go Conference 2017 Autumn
Self Introduce • Kenshi Kamata • @knsh14 (twitter, GitHub) •
KLab inc. ◦ Unity3d Editor Extension ◦ Create Facebook Instant Game
What I did? • Read Writing An Interpreter In Go
◦ https://interpreterbook.com/ • Actually Create An Interpreter • Create An Interpreter in about 1400 lines! ◦ Included test code, about 2500 lines
DEMO let x = 0; let array = [0, 10,
20, 30, 40]; array[1]; let fib = fn(x) { if(x == 0) { 0; } else { if (x == 1) { 1;} else { fib(x-1) + fib(x-2);}}}; let loop = fn(i, max, f) { if(i == max){return 0;} f(); loop(i +1, max, f);}; let p = fn() { puts(“hello world”);};
Why I did? • I want to create self-produced Language
• Tried “Writing An Interpreter In C” book ◦ but it was so hard and gave up • I heard good book by Go is released! so I decided to try again.
Specification • Monkey Language • Integer, Boolean, String, Function •
Array, Hash • Able to use if statement ◦ No For loop • No yacc, use self-implemented Lexer and Parser
How long Until Finished • About 1 month • some
finished in one week • Most of people can finish within 1.5 month
Hard Part • Parser logic was hard • Pratt Parser
• google 演算子順位法 in japanese
What I learned • Fun to make Language by myself!
• Understand AST a little through Parser Chapter • Not Following Go Practice in Some part
Understand AST • Build AST in Parser Chapter • Wrote
A tool to check cyclomatic complexity with AST in past but it was poor code • I must be able to write better code after reading Parser chapter
Not Following Go Practice • Return Error ASAP / Return
Error type • Not good practice in Interpreter • Example Code in Monkey • Actually, go/parser has similar code • https://golang.org/src/go/parser/parser.go filter by “p.error”, you can see no handling error
Not following Go practice • Don’t want to stop processing
• For user experience, Parse to End then show all error messages • append to error string list, so not need to handle error at the time
Finally • Great feeling to exec code on my own
interpreter ◦ different feeling to playing my own game • Good for Japanese people ◦ Easy English ◦ Understand by English after Understanding by Code
Next is Your Turn!!