Backport #7954: "あ".byteslice(0,2).valid_encoding? should return false

• Status: Closed
• Assignee: usa (Usaku NAKAMURA)

[Tietew (Toru Iwase)]

=begin
valid encodingな文字列に対するString#bytesliceがinvalid encodingなバイト列を生成してもvalid_encoding?がtrueになります。
これはfalseになるべきだと思います。

なお、1.9.3も同じ挙動です。

irb(main):001:0> RUBY_DESCRIPTION
=> "ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]"
irb(main):002:0> "あ".encoding
=> #Encoding:UTF-8
irb(main):003:0> "あ".valid_encoding?
=> true
irb(main):004:0> "あ".byteslice(0,2)
=> "\xE3\x81"
irb(main):005:0> "あ".byteslice(0,2).valid_encoding?
=> true
irb(main):006:0> "\xE3\x81".encoding
=> #Encoding:UTF-8
irb(main):007:0> "\xE3\x81".valid_encoding?
=> false

ちなみに、invalidな文字列を正しい位置でbytesliceすると正しくvalidと判定されます。

irb(main):025:0> "あ\xE3".valid_encoding?
=> false
irb(main):026:0> "あ\xE3".byteslice(0,3).valid_encoding?
=> true
=end

[duerst (Martin Dürst)]

この場合の問題はそもぞも

"あ".byteslice(0,2).encoding
=> #Encoding:UTF-8

にあるかと思います。byteslice の戻り値の encoding は BINARY にすべきだと思います。

[naruse (Yui NARUSE)]

• Category set to M17N
• Status changed from Open to Assigned
• Assignee set to naruse (Yui NARUSE)

duerst (Martin Dürst) wrote:

この場合の問題はそもぞも

"あ".byteslice(0,2).encoding
=> #Encoding:UTF-8

にあるかと思います。byteslice の戻り値の encoding は BINARY にすべきだと思います。

BINARY で受け取りたいならば、"あ".b.slice(0,2) とすればいいのであって、別のメソッドである意味がありません。

[naruse (Yui NARUSE)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r39495.
Toru, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• string.c (str_byte_substr): don't set coderange if it's not known.
  [Bug #7954] [ruby-dev:47108]

[nagachika (Tomoyuki Chikanaga)]

• Tracker changed from Bug to Backport
• Project changed from Ruby master to Backport200
• Category deleted (M17N)
• Status changed from Closed to Assigned
• Assignee changed from naruse (Yui NARUSE) to nagachika (Tomoyuki Chikanaga)
• Target version deleted (2.0.0)

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Assigned to Closed

This issue was solved with changeset r39706.
Toru, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

merge revision(s) 39495: [Backport #7954]

* string.c (str_byte_substr): don't set coderange if it's not known.
  [Bug #7954] [ruby-dev:47108]

[nagachika (Tomoyuki Chikanaga)]

• Project changed from Backport200 to Backport193
• Status changed from Closed to Assigned
• Assignee changed from nagachika (Tomoyuki Chikanaga) to usa (Usaku NAKAMURA)

1.9.3 でも同じ挙動ということなので Backport93 に移動しておきます。

[usa (Usaku NAKAMURA)]

• Status changed from Assigned to Closed

This issue was solved with changeset r39978.
Toru, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

merge revision(s) 39495: [Backport #7954]

* string.c (str_byte_substr): don't set coderange if it's not known.
  [Bug #7954] [ruby-dev:47108]