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
Amazon Q CLI開発で学んだAIコーディングツールの使い方
licux
3
190
WebAssemblyインタプリタを書く ~Component Modelを添えて~
ruccho
1
870
レガシープロジェクトで最大限AIの恩恵を受けられるようClaude Codeを利用する
tk1351
2
420
Constant integer division faster than compiler-generated code
herumi
2
670
The State of Fluid (2025)
s2b
0
180
Nuances on Kubernetes - RubyConf Taiwan 2025
envek
0
180
学習を成果に繋げるための個人開発の考え方 〜 「学習のための個人開発」のすすめ / personal project for leaning
panda_program
1
100
パスタの技術
yusukebe
1
390
kiroでゲームを作ってみた
iriikeita
0
180
サイトを作ったらNFCタグキーホルダーを爆速で作れ!
yuukis
0
400
Google I/O recap web編 大分Web祭り2025
kponda
0
2.9k
Bedrock AgentCore ObservabilityによるAIエージェントの運用
licux
9
710
Featured
See All Featured
The Straight Up "How To Draw Better" Workshop
denniskardys
236
140k
RailsConf 2023
tenderlove
30
1.2k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3k
A designer walks into a library…
pauljervisheath
207
24k
Navigating Team Friction
lara
188
15k
Fireside Chat
paigeccino
39
3.6k
YesSQL, Process and Tooling at Scale
rocio
173
14k
Code Review Best Practice
trishagee
70
19k
Six Lessons from altMBA
skipperchong
28
4k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
1k
Designing Experiences People Love
moore
142
24k
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!!