source: other-projects/hathitrust/vagrant-hadoop-cluster/trunk/modules/stdlib/lib/puppet/parser/functions/hash.rb@ 30903

#
# hash.rb
#

module Puppet::Parser::Functions
  newfunction(:hash, :type => :rvalue, :doc => <<-EOS
This function converts an array into a hash.

*Examples:*

    hash(['a',1,'b',2,'c',3])

Would return: {'a'=>1,'b'=>2,'c'=>3}
    EOS
  ) do |arguments|

    raise(Puppet::ParseError, "hash(): Wrong number of arguments " +
      "given (#{arguments.size} for 1)") if arguments.size < 1

    array = arguments[0]

    unless array.is_a?(Array)
      raise(Puppet::ParseError, 'hash(): Requires array to work with')
    end

    result = {}

    begin
      # This is to make it compatible with older version of Ruby ...
      array  = array.flatten
      result = Hash[*array]
    rescue StandardError
      raise(Puppet::ParseError, 'hash(): Unable to compute ' +
        'hash from array given')
    end

    return result
  end
end

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