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Diffstat (limited to 'lib/prism/polyfill/unpack1.rb')
-rw-r--r-- | lib/prism/polyfill/unpack1.rb | 14 |
1 files changed, 14 insertions, 0 deletions
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 |