[ruby-core:78997] [Ruby trunk Bug#13110] Byte-based operations for String

Issue #13110 has been updated by Shugo Maeda.


Let me share my use case.

I'm implementing a text editor, in which the point of a buffer is represented by a byte-based offset for speed.
We can get substrings of a buffer by byteslice, but we need force_encoding(Encoding::ASCII_8BIT) to change
the contents of a buffer because we don't have bytesplice:

  https://github.com/shugo/textbringer/blob/d69d4daddc268a95b1a51dbe397bff8fc2d587f9/lib/textbringer/buffer.rb#L32
  https://github.com/shugo/textbringer/blob/d69d4daddc268a95b1a51dbe397bff8fc2d587f9/lib/textbringer/buffer.rb#L135

We also need force_encoding(Encoding::ASCII_8BIT) for text search:

  https://github.com/shugo/textbringer/blob/d69d4daddc268a95b1a51dbe397bff8fc2d587f9/lib/textbringer/buffer.rb#L472

In this case, searching by a regular expression like /[あいうえお]/ fails.

String#bytesplice, String#byteindex, and MatchData#byteoffset are useful for these purposes.


----------------------------------------
Bug #13110: Byte-based operations for String
https://bugs.ruby-lang.org/issues/13110#change-62407

* Author: Shugo Maeda
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
How about to add byte-based operations for String?

```
s = "あああいいいあああ"
p s.byteindex(/ああ/, 4) #=> 18
x, y = Regexp.last_match.byteoffset(0) #=> [18, 24]
s.bytesplice(x...y, "おおお")
p s #=> "あああいいいおおおあ"
```



---Files--------------------------------
byteindex.diff (2.83 KB)


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