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
続・mruby/cにUTF-8 を実装する
Search
ima1zumi
August 19, 2023
1
29
続・mruby/cにUTF-8 を実装する
ima1zumi
August 19, 2023
Tweet
Share
More Decks by ima1zumi
See All by ima1zumi
Ruby Taught Me About Under the Hood
ima1zumi
6
14k
Exploring Reline: Enhancing Command Line Usability
ima1zumi
1
80
10年物のRailsアプリにキャッチアップ!〜コードを読まずに理解したかった〜
ima1zumi
0
89
RubyKaigiの登壇者一覧ページを作った
ima1zumi
0
390
Relineのその後の生活
ima1zumi
0
220
IRB and Reline Kaigi 2024
ima1zumi
0
12
Exploring Reline: Enhancing Command Line Usability
ima1zumi
3
14k
Reline 1分 Cooking
ima1zumi
0
37
UTF-8 is coming to mruby/c
ima1zumi
4
5.4k
Featured
See All Featured
Designing Experiences People Love
moore
142
24k
How to Think Like a Performance Engineer
csswizardry
24
1.7k
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3.3k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.1k
Code Reviewing Like a Champion
maltzj
524
40k
Fireside Chat
paigeccino
37
3.5k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
The Cost Of JavaScript in 2023
addyosmani
50
8.3k
Art, The Web, and Tiny UX
lynnandtonic
299
21k
Writing Fast Ruby
sferik
628
61k
Transcript
ଓɾmruby/cʹUTF-8 Λ࣮͢Δ 2023-08-19 ima1zumi
Introduction • @ima1zumi (Mari Imaizumi) • Character encoding lover •
IRB and Reline committer • ESM, inc. 2
ఏڙ
RubyKaigi 2023Ͱͨ͜͠ͱ • mruby/cʹUTF-8Λ࣮ͯ͠·͢
mruby/cͱ • ϝϞϦ༻ྔ͕গͳ͍ • < 40KB • ϫϯνοϓϚΠίϯ͕λʔήοτ • CͱRubyͰ࣮͞Ε͍ͯΔ
5 [^3]: https://github.com/mrubyc/mrubyc
mruby/c !== mruby 6 Ref: mruby/cͰ࢝ΊΔΦϦδφϧIoTσόΠε࡞Γ https://magazine.rubyist.net/articles/0059/0059-original_mrubyc_iot_device.html
mruby/cͷString • RubyͰ͍͏ͱ͜ΖͷASCII-8BIT͔͑͠ͳ͍ • UTF-8͑ΔΑ͏ʹ࣮த
ରԠ͠ͳ͍͍ͯ͘ϝιου • new, +, *, to_i, to_f, to_s, b, clear,
chomp, chomp!, dup, empty?, getbyte, lstrip, lstrip!, rstrip, rstrip!, strip!, to_sym, start_with?, end_with?, include?, bytes, ==, <=> • 25ݸ 8
ରԠ͕ඞཁ • ࣮ࡁ: 12 • index, size(length), slice([]), slice!([]=), insert,
inspect, ord • <<, Integer#chr, each_char, encoding, valid_encoding? • Todo: 3 • tr, tr!, split 9
Integer#chr • selfΛίʔυϙΠϯτͱΈͳͯ͠จࣈΛฦ͢ • UTF-8ͷ߹Unicode scalar valueͱΈͳ͢ • Scalar value্Լαϩήʔτ(0xD800͔Β0xDFFF)ؚ·ͳ͍
https://www.unicode.org/versions/ Unicode15.0.0/ch03.pdf
None
0b0011_0000_0100_0010 (U+3042) ↑scalar value
0b0011_0000_0100_0010 (U+3042) 1110zzzz 10yyyyyy 10xxxxxx ↑scalar value
1110zzzz 10yyyyyy 10xxxxxx ↑scalar value 0b0011_0000_0100_0010 (U+3042)
11100011 10yyyyyy 10xxxxxx ↑scalar value 0b0011_0000_0100_0010 (U+3042)
0b0011_0000_0100_0010 (U+3042) 11100011 10yyyyyy 10xxxxxx ↑scalar value
0b0011_0000_0100_0010 (U+3042) 11100011 10000001 10xxxxxx ↑scalar value
0b0011_0000_0100_0010 (U+3042) 11100011 10000001 10xxxxxx ↑scalar value
0b0011_0000_0100_0010 (U+3042) 11100011 10000001 10000010 ↑scalar value
0b00110000_01000010 (U+3042) 0b11100011_10000001_10000010 "あ".bytes.map { _1.to_s(2) } => ["11100011", "10000001",
"10000010"]
None
String#<<
String#encoding • mruby/cͷจࣈίʔυΓସ͑ϏϧυΦϓγϣϯͰ੍ޚ • ϏϧυΦϓγϣϯΛݟͯฦ͚ͩ͢
String#valid_encoding? • ASCII-8BITͳΜͰOK • UTF-8well-formed͔Ͳ͏͔ͷఆ͕ඞཁ • ϏϧυΦϓγϣϯͰStringͷencodingΛΓସ͍͑ͯΔͨΊɺUTF-8ͱͯ͠well-formed͔Ͳ͏͔ Λͯ͢ͷStringͰ֬ೝ͢ΔͱόΠφϦ͕StringʹೖΒͳ͍ͱ͍͏͕͋Δ • ͔ͱ͍ͬͯෆਖ਼UTF-8ڐͨ͘͠ͳ͍
• ηΩϡϦςΟϦεΫ • StringͷߏମΛେ͖ͨ͘͘͠ͳ͍ • ંҊ: valid_encoding?ͰνΣοΫՄೳʹ͢Δ
Well-formed UTF-8 byte sequences • mruby/cϏϧυΦϓγϣϯͰStringͷencodingΛΓସ͑Δ • શStringͰਖ਼͍͔֬͠ೝ͢ΔͱόΠφϦ͕࡞ෆՄೳʹͳΔ • ͔ͱ͍ͬͯෆਖ਼UTF-8ڐͨ͘͠ͳ͍
• ηΩϡϦςΟϦεΫ • StringͷߏମΛେ͖ͨ͘͘͠ͳ͍ • ંҊ: valid_encoding?ͰνΣοΫՄೳʹ͢Δ
None
None
valid_encoding? • UTF-8ͷόϦσʔγϣϯΞϧΰϦζϜ͍Ζ͍Ζ • [ߴͳUTF-8όϦσʔγϣϯɺrangeΞϧΰϦζϜͷհ - ͖ͯͱ͏ ͳ͍͞ͱɻ͐ͨΜ](https://tekitoh-memdhoi.info/views/872) • https://github.com/cyb70289/utf8
• [[2010.03090] Validating UTF-8 In Less Than One Instruction Per Byte](https://arxiv.org/abs/2010.03090) • Θ͔Γ͍ͨ
upcase, downcase • ରԠ͠ͳ͍ • UnicodeͷେจࣈɺখจࣈมϚοϐϯάςʔϒϧ͕ඞਢ • "LJ".downcase == "lj"
• ϚΠίϯͰͦ͜·Ͱ͍ͨ͠Ϣʔεέʔε͋·Γͳͦ͞͏