In JRuby, StringScanner.new("") can only hold Encoding:US-ASCII encoding. #78
Description
No Problem case (Ruby 3.3.0) 🙆♂️
$ ruby -v
ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin22]
$ gem list strscan
*** LOCAL GEMS ***
strscan (3.0.8, default: 3.0.7)
$ irb
> require 'strscan'
=> true
> s = StringScanner.new("test")
=> #<StringScanner 0/4 @ "test">
> s.rest.encoding
=> #<Encoding:UTF-8>
> s = StringScanner.new("")
=> #<StringScanner fin>
> s.rest.encoding
=> #<Encoding:UTF-8>
> s.string.force_encoding("ASCII-8BIT")
=> ""
> s.rest.encoding
=> #<Encoding:ASCII-8BIT>
s.string.force_encoding("UTF-8")
=> ""
> s.rest.encoding
=> #<Encoding:UTF-8>
Problem case (JRuby 9.4.5.0 ) 🙅
$ ruby -v
jruby 9.4.5.0 (3.1.4) 2023-11-02 1abae2700f Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 +jit [x86_64-darwin]
$ gem list strscan
*** LOCAL GEMS ***
strscan (3.0.8 java, default: 3.0.7 java)
$ irb
> require 'strscan'
=> true
> s = StringScanner.new("test")
=> #<StringScanner 0/4 @ "test">
> s.rest.encoding
=> #<Encoding:UTF-8>
> s = StringScanner.new("")
=> #<StringScanner fin>
> s.rest.encoding
=> #<Encoding:US-ASCII>
> s.string.force_encoding("UTF-8")
=> ""
> s.rest.encoding
=> #<Encoding:US-ASCII>
StringScanner.new("") can only hold Encoding:US-ASCII encoding.
The above causes the following differences in behavior.
- Ruby 3.3.0
> s = StringScanner.new("")
=> #<StringScanner fin>
> s.string = s.rest + "test"
=> "test"
> s.rest.encoding
=> #<Encoding:UTF-8>
- JRuby 9.4.5.0
> s = StringScanner.new("")
=> #<StringScanner fin>
> s.string = s.rest + "test"
=> "test"
> s.rest.encoding
=> #<Encoding:US-ASCII>
The following appear to be unaffected.
- Ruby 3.3.0
> s = StringScanner.new("")
=> #<StringScanner fin>
> s << "test"
=> #<StringScanner 0/4 @ "test">
> s.rest.encoding
=> #<Encoding:UTF-8>
- JRuby 9.4.5.0
> s = StringScanner.new("")
=> #<StringScanner fin>
> s << "test"
=> #<StringScanner 0/4 @ "test">
> s.rest.encoding
=> #<Encoding:UTF-8>
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