puppetlabs-stdlib/lib/puppet/parser/functions/delete.rb

#
# delete.rb
#

# TODO(Krzysztof Wilczynski): We need to add support for regular expression ...

module Puppet::Parser::Functions
  newfunction(:delete, :type => :rvalue, :doc => <<-EOS
Deletes all instances of a given element from an array, substring from a
string, or key from a hash.

*Examples:*

    delete(['a','b','c','b'], 'b')
    Would return: ['a','c']

    delete({'a'=>1,'b'=>2,'c'=>3}, 'b')
    Would return: {'a'=>1,'c'=>3}

    delete({'a'=>1,'b'=>2,'c'=>3}, ['b','c'])
    Would return: {'a'=>1}

    delete('abracadabra', 'bra')
    Would return: 'acada'
  EOS
  ) do |arguments|

    if (arguments.size != 2) then
      raise(Puppet::ParseError, "delete(): Wrong number of arguments "+
                                  "given #{arguments.size} for 2.")
    end

    collection = arguments[0].dup
    Array(arguments[1]).each do |item|
      case collection
        when Array, Hash
          collection.delete item
        when String
          collection.gsub! item, ''
        else
          raise(TypeError, "delete(): First argument must be an Array, " +
                             "String, or Hash. Given an argument of class #{collection.class}.")
      end
    end
    collection
  end
end

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