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Issue When running tests with Ruby 3.4.0rc1, the following warnings are displayed. ```console $ rake test Run options: --seed 46514 /work/ruby/json-stream/lib/json/stream/parser.rb:549: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information) /work/ruby/json-stream/lib/json/stream/parser.rb:555: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information) ``` Cuases According to https://bugs.ruby-lang.org/issues/20205, string literals may be frozen by default in future Ruby versions (potentially Ruby 4.0+). Starting from Ruby 3.4.0, warnings like `warning: literal string will be frozen in the future` are shown if string literals are mutable. Solution We explicitly make string literals mutable using `+"string literal"` Additionally, we add `# frozen_string_literal: true` at the top of the affected files and handle the warnings to ensure compatibility with Ruby versions before 3.4.0.
kou
reviewed
Dec 25, 2024
lib/json/stream/buffer.rb
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| # Avoid state machine for complete UTF-8. | ||
| if @buffer.empty? | ||
| data.force_encoding(Encoding::UTF_8) | ||
| (+data).force_encoding(Encoding::UTF_8) |
Contributor
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Does this work?
a = "a"
a.force_encoding("ASCII-8BIT")
a.freeze
(+a).force_encoding(Encoding::UTF_8)
p a.encoding # -> #<Encoding:BINARY (ASCII-8BIT)>
Author
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Sorry it doesn't work. We should assign the result to new variable. I will fix it.
a = "a"
a.force_encoding("ASCII-8BIT")
a.freeze
b = (+a).force_encoding(Encoding::UTF_8)
p a.encoding # -> #<Encoding:BINARY (ASCII-8BIT)>
p b.econding # -> #<Encoding:UTF-8>
Contributor
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dup than + (conditional dup) may be better here because users may not expect that << may change the argument (data).
data = data.dup
data.force_encoding(Encoding::UTF_8)
Author
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fix: d97d4d2 I see. It totally makes sense to me too!
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Issue
When running tests with Ruby 3.4.0rc1, the following warnings are displayed.
Causes
According to https://bugs.ruby-lang.org/issues/20205, string literals may be frozen by default in future Ruby versions (potentially Ruby 4.0+).
Starting from Ruby 3.4.0, warnings like
warning: literal string will be frozen in the futureare shown if string literals are mutable.Solution
We explicitly make string literals mutable using
+"string literal"Additionally, we add# frozen_string_literal: trueat the top of the affected files and handle the warnings to ensure compatibility with Ruby versions before 3.4.0.