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
3k
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
エンジニアインターン「Treasure」とHonoの2年、そして未来へ / Our Journey with Hono Two Years at Treasure and Beyond
carta_engineering
0
440
Cursorハンズオン実践!
eltociear
2
1.2k
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
530
技術的負債の正体を知って向き合う
irof
0
270
GC25 Recap: The Code You Reviewed is Not the Code You Built / #newt_gophercon_tour
mazrean
0
120
実践Claude Code:20の失敗から学ぶAIペアプログラミング
takedatakashi
18
9k
品質ワークショップをやってみた
nealle
0
650
NixOS + Kubernetesで構築する自宅サーバーのすべて
ichi_h3
0
1.2k
チームの境界をブチ抜いていけ
tokai235
0
230
One Enishi After Another
snoozer05
PRO
0
170
三者三様 宣言的UI
kkagurazaka
0
280
理論と実務のギャップを超える
eycjur
0
190
Featured
See All Featured
Designing for Performance
lara
610
69k
Into the Great Unknown - MozCon
thekraken
40
2.1k
The World Runs on Bad Software
bkeepers
PRO
72
11k
Building an army of robots
kneath
305
46k
VelocityConf: Rendering Performance Case Studies
addyosmani
333
24k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
285
14k
Visualization
eitanlees
150
16k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
37
2.6k
The Pragmatic Product Professional
lauravandoore
36
7k
Music & Morning Musume
bryan
46
6.9k
The Power of CSS Pseudo Elements
geoffreycrofte
80
6k
Done Done
chrislema
185
16k
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!!