58 lines
1.6 KiB
Ruby
58 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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# Released under the MIT License.
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# Copyright, 2022-2024, by Samuel Williams.
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class IO
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module Event
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# Helper methods for detecting support for various features.
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module Support
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# Some features are only availble if the IO::Buffer class is available.
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#
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# @returns [Boolean] Whether the IO::Buffer class is available.
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def self.buffer?
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IO.const_defined?(:Buffer)
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end
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# The basic fiber scheduler was introduced along side the IO::Buffer class.
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#
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# @returns [Boolean] Whether the IO::Buffer class is available.
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#
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# To be removed on 31 Mar 2025.
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def self.fiber_scheduler_v1?
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IO.const_defined?(:Buffer)
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end
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# More advanced read/write methods and blocking controls were introduced in Ruby 3.2.
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#
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# To be removed on 31 Mar 2026.
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def self.fiber_scheduler_v2?
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# Some interface changes were back-ported incorrectly:
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# https://github.com/ruby/ruby/pull/10778
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# Specifically "Improvements to IO::Buffer read/write/pread/pwrite."
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# Missing correct size calculation.
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return false if RUBY_VERSION >= "3.2.5"
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IO.const_defined?(:Buffer) and Fiber.respond_to?(:blocking) and IO::Buffer.instance_method(:read).arity == -1
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end
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# Updated inferfaces for read/write and IO::Buffer were introduced in Ruby 3.3, including pread/pwrite.
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#
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# To become the default 31 Mar 2026.
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def self.fiber_scheduler_v3?
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if fiber_scheduler_v2?
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return true if RUBY_VERSION >= "3.3"
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# Feature detection if required:
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begin
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IO::Buffer.new.slice(0, 0).write(STDOUT)
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return true
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rescue
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return false
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end
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end
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end
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end
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end
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end
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