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#
# join.rb
#
module Puppet::Parser::Functions
newfunction(:join_keys_to_values, :type => :rvalue, :doc => <<-EOS
This function joins each key of a hash to that key's corresponding value with a
separator. Keys are cast to strings. If values are arrays, multiple keys
are added for each element. The return value is an array in
which each element is one joined key/value pair.
*Examples:*
join_keys_to_values({'a'=>1,'b'=>2}, " is ")
Would result in: ["a is 1","b is 2"]
join_keys_to_values({'a'=>1,'b'=>[2,3]}, " is ")
Would result in: ["a is 1","b is 2","b is 3"]
EOS
) do |arguments|
# Validate the number of arguments.
if arguments.size != 2
raise(Puppet::ParseError, "join_keys_to_values(): Takes exactly two " +
"arguments, but #{arguments.size} given.")
end
# Validate the first argument.
hash = arguments[0]
if not hash.is_a?(Hash)
raise(TypeError, "join_keys_to_values(): The first argument must be a " +
"hash, but a #{hash.class} was given.")
end
# Validate the second argument.
separator = arguments[1]
if not separator.is_a?(String)
raise(TypeError, "join_keys_to_values(): The second argument must be a " +
"string, but a #{separator.class} was given.")
end
# Join the keys to their values.
hash.map do |k,v|
if v.is_a?(Array)
v.map { |va| String(k) + separator + String(va) }
else
String(k) + separator + String(v)
end
end.flatten
end
end
# vim: set ts=2 sw=2 et :
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