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# frozen_string_literal: true
#
# delete_undef_values.rb
#
module Puppet::Parser::Functions
newfunction(:delete_undef_values, type: :rvalue, doc: <<-DOC
@summary
Returns a copy of input hash or array with all undefs deleted.
@example Example usage
$hash = delete_undef_values({a=>'A', b=>'', c=>undef, d => false})
Would return: {a => 'A', b => '', d => false}
While:
$array = delete_undef_values(['A','',undef,false])
Would return: ['A','',false]
> *Note:*
Since Puppet 4.0.0 the equivalent can be performed with the built-in
[`filter`](https://puppet.com/docs/puppet/latest/function.html#filter) function:
$array.filter |$val| { $val =~ NotUndef }
$hash.filter |$key, $val| { $val =~ NotUndef }
@return [Array] The given array now issing of undefined values.
DOC
) do |args|
raise(Puppet::ParseError, "delete_undef_values(): Wrong number of arguments given (#{args.size})") if args.empty?
raise(Puppet::ParseError, "delete_undef_values(): expected an array or hash, got #{args[0]} type #{args[0].class} ") unless args[0].is_a?(Array) || args[0].is_a?(Hash)
result = args[0].dup
if result.is_a?(Hash)
result.delete_if { |_, val| val.equal?(:undef) || val.nil? }
elsif result.is_a?(Array)
result.delete :undef
result.delete nil
end
result
end
end
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