diff options
Diffstat (limited to 'lib/prism/polyfill')
-rw-r--r-- | lib/prism/polyfill/byteindex.rb | 13 | ||||
-rw-r--r-- | lib/prism/polyfill/unpack1.rb | 14 |
2 files changed, 27 insertions, 0 deletions
diff --git a/lib/prism/polyfill/byteindex.rb b/lib/prism/polyfill/byteindex.rb new file mode 100644 index 0000000000..98c6089f14 --- /dev/null +++ b/lib/prism/polyfill/byteindex.rb @@ -0,0 +1,13 @@ +# frozen_string_literal: true + +# Polyfill for String#byteindex, which didn't exist until Ruby 3.2. +if !("".respond_to?(:byteindex)) + String.include( + Module.new { + def byteindex(needle, offset = 0) + charindex = index(needle, offset) + slice(0...charindex).bytesize if charindex + end + } + ) +end diff --git a/lib/prism/polyfill/unpack1.rb b/lib/prism/polyfill/unpack1.rb new file mode 100644 index 0000000000..3fa9b5a0c5 --- /dev/null +++ b/lib/prism/polyfill/unpack1.rb @@ -0,0 +1,14 @@ +# frozen_string_literal: true + +# Polyfill for String#unpack1 with the offset parameter. Not all Ruby engines +# have Method#parameters implemented, so we check the arity instead if +# necessary. +if (unpack1 = String.instance_method(:unpack1)).respond_to?(:parameters) ? unpack1.parameters.none? { |_, name| name == :offset } : (unpack1.arity == 1) + String.prepend( + Module.new { + def unpack1(format, offset: 0) # :nodoc: + offset == 0 ? super(format) : self[offset..].unpack1(format) # steep:ignore + end + } + ) +end |