ruby-dev

返信ありがとうございます。
> なかだです。
>   
> 1. nil.to_sはencodingに関係なく、US-ASCIIの""を返す
> 2. 文字列リテラルは、内容に関係なく-Kで指定されたencodingに従う
> 3. 結合の際にASCII-compatibleかどうかは考慮されない
>
> 詳細は[ruby-dev:31715]からのスレッドをみてください。
>   
内部コードをどうするかという仕様に関係するのですね。
> 上の例に関しては、nil.to_sを直すだけでも通るようになると思います
> が、たとえばutf-8のライブラリを使うときには必ず-Kuを付けなければ
> ならないというのも、不便だと思います。
>
> 結局、自動変換をサポートするかという話になるのかもしれませんが、
> 外部からもらったStringは常にencodeしてから使え、というのもかなり
> 面倒です。
>   
よく理解していないかもしれませんが、
[ruby-dev:31715]のなかださんの提案は、

ruby -Ks -e '"at" + nil.to_s'
US-ASCII + US-ASCII でOK

ruby -Ks -e '"あっと" + nil.to_s'
Shift_JIS + US-ASCIIでNG

って感じでしょうか。それともなんらかの変換をして後者も通るようになってる
んでしょうか。

eklerni

Thread

Prev Next

In This Thread

Prev Next

[#31690] m17n questions — SASADA Koichi <ko1@...>

[#31692] cannot run test-all — "U.Nakamura" <usa@...>

[#31697] Re: [ruby-list:43970] 次の1.8.6 — Tadayoshi Funaba <tadf@...>

[#31698] Re: [ruby-cvs:20568] Ruby:r13331 (trunk): * eval_jump.ci (rb_f_catch): generate new tag object if no argument is — "U.Nakamura" <usa@...>

[#31702] [ANN] Rubyロゴコンテスト — Shugo Maeda <shugo@...>

[#31709] [BUG] non-initialized struct — Tanaka Akira <akr@...>

[#31710] optimize range space — Tanaka Akira <akr@...>

[#31715] string literal encoding — Nobuyoshi Nakada <nobu@...>

[#31729] packed st_table — Nobuyoshi Nakada <nobu@...>

[#31731] ordered/unordered st_table — Nobuyoshi Nakada <nobu@...>

[#31734] [m17n] String#chop & String#succ — Nobuyoshi Nakada <nobu@...>

[#31736] integer overflow in Array#[] — sheepman <sheepman@...>

[#31737] integer overflow in Array#[]= — sheepman <sheepman@...>

[#31738] integer overflow in Array#fill — sheepman <sheepman@...>

[#31739] integer overflow in String#[]= — sheepman <sheepman@...>

[#31740] FileTest.identical? with IO — sheepman <sheepman@...>

[#31743] deprecating RUBY_VERSION_CODE — Nobuyoshi Nakada <nobu@...>

[#31744] [m17n] String#encode — Nobuyoshi Nakada <nobu@...>

[#31748] typo at Array#cycle documentation — Yugui <yugui@...>

[#31754] Re: [ruby-cvs:20585] Ruby:r13348 (trunk): * array.c (rb_ary_cycle): typo in rdoc. a patch from Yugui — "U.Nakamura" <usa@...>

[#31759] SEGV by modifying __members__ — Tanaka Akira <akr@...>

[#31763] integer overflow in Range#step — sheepman <sheepman@...>

[#31768] shellescape — "Akinori MUSHA" <knu@...>

[#31774] RSTRING(value)->ptr == NULL ? — Tietew <tietew+ruby-dev@...>

[#31775] 1.9 on OpenBSD — SASADA Koichi <ko1@...>

[#31780] "string"[/str/]=:not_string dumps core — Nobuyoshi Nakada <nobu@...>

[#31781] `scan': character encodings differ (ArgumentError) — Kouhei Sutou <kou@...>

[#31786] rstripがstripしすぎる — Kouhei Sutou <kou@...>

[#31787] 文字列のinspect — eklerni <eklerni@...>

[#31798] generator from Enumerable#map — "Yusuke ENDOH" <mame@...>

[#31799] weakref.rbにデバッグ用print — "madoka yamamoto" <yamamotomadoka@...>

[#31802] hash value of { n => n } — "Yusuke ENDOH" <mame@...>

[#31804] TYPE(cl) in rb_obj_is_kind_of — Tanaka Akira <akr@...>

[#31806] rb_str_substr is much slower than rb_str_subpat — Nobuyoshi Nakada <nobu@...>

[#31810] rb_obj_is_kind_of — Tanaka Akira <akr@...>

[#31815] 文字列の式展開 — eklerni <eklerni@...>

[#31816] SEGV by removing undefined method — Tanaka Akira <akr@...>

[#31817] removing undefined method on 1.8 — Tanaka Akira <akr@...>

[#31818] SEGV by attr — Tanaka Akira <akr@...>

[#31819] rb_clear_cache_by_class — Tanaka Akira <akr@...>

[#31820] valgrind set_trace_func — Tanaka Akira <akr@...>

[#31821] unsubscribe — "Angadpreet Chadha" <angadsc@...>

[#31831] trunk で現状セルフビルドができません — "きむらこういち" <hogemuta@...>

[#31835] Kernel#` is blocked with Ruby/GLib2 on Intel Mac — Kouhei Sutou <kou@...>

[#31840] valgrind fiber — Tanaka Akira <akr@...>

[#31842] 拡張ライブラリ内での SIGVTALRM — とみたまさひろ <tommy@...>

[#31848] huge `if' dumps core — "Yusuke ENDOH" <mame@...>

[#31849] Exception `ArgumentError' at (null):0 - NULL pointer given — Tanaka Akira <akr@...>

[#31850] meta programming might dump core — "Yusuke ENDOH" <mame@...>

[#31852] Re: [ ruby-Bugs-14195 ] Array instance method include? speed can be increased — Urabe Shyouhei <shyouhei@...>

[#31853] optimize T_OBJECT space — Tanaka Akira <akr@...>

[#31854] Symbol.all_symbols — eklerni <eklerni@...>

[#31866] reading a pipe by multiple threads — Tanaka Akira <akr@...>

[#31870] marshal_dumpで不正なデータが書き出される — kumaryu <kumaryu@...>

[#31871] Process::WNOHANG — Tanaka Akira <akr@...>

[#31887] ruby 1.9 で ruby 1.9 はコンパイルできなかった — Martin Duerst <duerst@...>

[#31896] URI::LDAPS — Kouhei Sutou <kou@...>

[#31898] memory consumption on ext/dl build — Tanaka Akira <akr@...>

[#31900] platform-independent per-process initialization — Nobuyoshi Nakada <nobu@...>

[#31909] ipaddr — Kazuhiro NISHIYAMA <zn@...>

[#31911] eval("", TOPLEVEL_BINDING) and ObjectSpace._id2ref — Tanaka Akira <akr@...>

[#31912] exit status of ruby -v — Tanaka Akira <akr@...>

[#31913] SEGV: Fiber.new{ callcc{|c| @c = c } }.resume — Tanaka Akira <akr@...>

[#31914] m17nの全貌に関する何か — Masayoshi Takahashi <maki@...>

[ruby-dev:31825] Re: 文字列の式展開

Thread

In This Thread

[#31759] SEGV by modifying members — Tanaka Akira <akr@...>