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Current Path : /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/functions/
Current File : //opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/functions/slice.rb
# Slices an array or hash into pieces of a given size.
#
# This function takes two mandatory arguments: the first should be an array or hash, and the second specifies
# the number of elements to include in each slice.
#
# When the first argument is a hash, each key value pair is counted as one. For example, a slice size of 2 will produce
# an array of two arrays with key, and value.
#
# @example Slicing a Hash
#
# ```puppet
# $a.slice(2) |$entry|          { notice "first ${$entry[0]}, second ${$entry[1]}" }
# $a.slice(2) |$first, $second| { notice "first ${first}, second ${second}" }
# ```
# The function produces a concatenated result of the slices.
#
# @example Slicing an Array
#
# ```puppet
# slice([1,2,3,4,5,6], 2) # produces [[1,2], [3,4], [5,6]]
# slice(Integer[1,6], 2)  # produces [[1,2], [3,4], [5,6]]
# slice(4,2)              # produces [[0,1], [2,3]]
# slice('hello',2)        # produces [[h, e], [l, l], [o]]
# ```
#
# @example Passing a lambda to a slice (optional)
#
# ```puppet
#  $a.slice($n) |$x| { ... }
#  slice($a) |$x| { ... }
# ```
#
# The lambda should have either one parameter (receiving an array with the slice), or the same number
# of parameters as specified by the slice size (each parameter receiving its part of the slice).
# If there are fewer remaining elements than the slice size for the last slice, it will contain the remaining
# elements. If the lambda has multiple parameters, excess parameters are set to undef for an array, or
# to empty arrays for a hash.
#
# @example Getting individual values of a slice
#
# ```puppet
#     $a.slice(2) |$first, $second| { ... }
# ```
#
# @since 4.0.0
#
Puppet::Functions.create_function(:slice) do
  dispatch :slice_Hash do
    param 'Hash[Any, Any]', :hash
    param 'Integer[1, default]', :slice_size
    optional_block_param
  end

  dispatch :slice_Enumerable do
    param 'Iterable', :enumerable
    param 'Integer[1, default]', :slice_size
    optional_block_param
  end

  def slice_Hash(hash, slice_size, &pblock)
    result = slice_Common(hash, slice_size, [], block_given? ? pblock : nil)
    block_given? ? hash : result
  end

  def slice_Enumerable(enumerable, slice_size, &pblock)
    enum = Puppet::Pops::Types::Iterable.asserted_iterable(self, enumerable)
    result = slice_Common(enum, slice_size, nil, block_given? ? pblock : nil)
    block_given? ? enumerable : result
  end

  def slice_Common(o, slice_size, filler, pblock)
    serving_size = asserted_slice_serving_size(pblock, slice_size)

    enumerator = o.each_slice(slice_size)
    result = []
    if serving_size == 1
      begin
        if pblock
          loop do
            pblock.call(enumerator.next)
          end
        else
          loop do
            result << enumerator.next
          end
        end
      rescue StopIteration
      end
    else
      begin
        loop do
          a = enumerator.next
          if a.size < serving_size
            a = a.dup.fill(filler, a.length...serving_size)
          end
          pblock.call(*a)
        end
      rescue StopIteration
      end
    end
    if pblock
      o
    else
      result
    end
  end

  def asserted_slice_serving_size(pblock, slice_size)
    if pblock
      arity = pblock.arity
      serving_size = arity < 0 ? slice_size : arity
    else
      serving_size = 1
    end
    if serving_size == 0
      raise ArgumentError, _("slice(): block must define at least one parameter. Block has 0.")
    end
    unless serving_size == 1 || serving_size == slice_size
      raise ArgumentError, _("slice(): block must define one parameter, or the same number of parameters as the given size of the slice (%{slice_size}). Block has %{serving_size}; %{parameter_names}") %
          { slice_size: slice_size, serving_size: serving_size, parameter_names: pblock.parameter_names.join(', ') }
    end
    serving_size
  end
end
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