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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/each.rb
# Runs a [lambda](https://puppet.com/docs/puppet/latest/lang_lambdas.html)
# repeatedly using each value in a data structure, then returns the values unchanged.
#
# This function takes two mandatory arguments, in this order:
#
# 1. An array, hash, or other iterable object that the function will iterate over.
# 2. A lambda, which the function calls for each element in the first argument. It can
# request one or two parameters.
#
# @example Using the `each` function
#
# `$data.each |$parameter| { <PUPPET CODE BLOCK> }`
#
# or
#
# `each($data) |$parameter| { <PUPPET CODE BLOCK> }`
#
# When the first argument (`$data` in the above example) is an array, Puppet passes each
# value in turn to the lambda, then returns the original values.
#
# @example Using the `each` function with an array and a one-parameter lambda
#
# ```puppet
# # For the array $data, run a lambda that creates a resource for each item.
# $data = ["routers", "servers", "workstations"]
# $data.each |$item| {
#  notify { $item:
#    message => $item
#  }
# }
# # Puppet creates one resource for each of the three items in $data. Each resource is
# # named after the item's value and uses the item's value in a parameter.
# ```
#
# When the first argument is a hash, Puppet passes each key and value pair to the lambda
# as an array in the form `[key, value]` and returns the original hash.
#
# @example Using the `each` function with a hash and a one-parameter lambda
#
# ```puppet
# # For the hash $data, run a lambda using each item as a key-value array that creates a
# # resource for each item.
# $data = {"rtr" => "Router", "svr" => "Server", "wks" => "Workstation"}
# $data.each |$items| {
#  notify { $items[0]:
#    message => $items[1]
#  }
# }
# # Puppet creates one resource for each of the three items in $data, each named after the
# # item's key and containing a parameter using the item's value.
# ```
#
# When the first argument is an array and the lambda has two parameters, Puppet passes the
# array's indexes (enumerated from 0) in the first parameter and its values in the second
# parameter.
#
# @example Using the `each` function with an array and a two-parameter lambda
#
# ```puppet
# # For the array $data, run a lambda using each item's index and value that creates a
# # resource for each item.
# $data = ["routers", "servers", "workstations"]
# $data.each |$index, $value| {
#  notify { $value:
#    message => $index
#  }
# }
# # Puppet creates one resource for each of the three items in $data, each named after the
# # item's value and containing a parameter using the item's index.
# ```
#
# When the first argument is a hash, Puppet passes its keys to the first parameter and its
# values to the second parameter.
#
# @example Using the `each` function with a hash and a two-parameter lambda
#
# ```puppet
# # For the hash $data, run a lambda using each item's key and value to create a resource
# # for each item.
# $data = {"rtr" => "Router", "svr" => "Server", "wks" => "Workstation"}
# $data.each |$key, $value| {
#  notify { $key:
#    message => $value
#  }
# }
# # Puppet creates one resource for each of the three items in $data, each named after the
# # item's key and containing a parameter using the item's value.
# ```
#
# For an example that demonstrates how to create multiple `file` resources using `each`,
# see the Puppet
# [iteration](https://puppet.com/docs/puppet/latest/lang_iteration.html)
# documentation.
#
# @since 4.0.0
#
Puppet::Functions.create_function(:each) do
  dispatch :foreach_Hash_2 do
    param 'Hash[Any, Any]', :hash
    block_param 'Callable[2,2]', :block
  end

  dispatch :foreach_Hash_1 do
    param 'Hash[Any, Any]', :hash
    block_param 'Callable[1,1]', :block
  end

  dispatch :foreach_Enumerable_2 do
    param 'Iterable', :enumerable
    block_param 'Callable[2,2]', :block
  end

  dispatch :foreach_Enumerable_1 do
    param 'Iterable', :enumerable
    block_param 'Callable[1,1]', :block
  end

  def foreach_Hash_1(hash)
    enumerator = hash.each_pair
    begin
      hash.size.times do
        yield(enumerator.next)
      end
    rescue StopIteration
    end
    # produces the receiver
    hash
  end

  def foreach_Hash_2(hash)
    enumerator = hash.each_pair
    begin
      hash.size.times do
        yield(*enumerator.next)
      end
    rescue StopIteration
    end
    # produces the receiver
    hash
  end

  def foreach_Enumerable_1(enumerable)
    enum = Puppet::Pops::Types::Iterable.asserted_iterable(self, enumerable)
      begin
        loop { yield(enum.next) }
      rescue StopIteration
      end
    # produces the receiver
    enumerable
  end

  def foreach_Enumerable_2(enumerable)
    enum = Puppet::Pops::Types::Iterable.asserted_iterable(self, enumerable)
    if enum.hash_style?
      enum.each { |entry| yield(*entry) }
    else
      begin
        index = 0
        loop do
          yield(index, enum.next)
          index += 1
        end
      rescue StopIteration
      end
    end
    # produces the receiver
    enumerable
  end
end
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