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# frozen_string_literal: true
#
# prefix.rb
#
module Puppet::Parser::Functions
newfunction(:prefix, type: :rvalue, doc: <<-DOC
@summary
This function applies a prefix to all elements in an array or a hash.
@example **Usage**
prefix(['a','b','c'], 'p')
Will return: ['pa','pb','pc']
> *Note:* since Puppet 4.0.0 the general way to modify values is in array is by using the map
function in Puppet. This example does the same as the example above:
['a', 'b', 'c'].map |$x| { "p${x}" }
@return [Hash] or [Array] The passed values now contains the passed prefix
DOC
) do |arguments|
# Technically we support two arguments but only first is mandatory ...
raise(Puppet::ParseError, "prefix(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.empty?
enumerable = arguments[0]
raise Puppet::ParseError, "prefix(): expected first argument to be an Array or a Hash, got #{enumerable.inspect}" unless enumerable.is_a?(Array) || enumerable.is_a?(Hash)
prefix = arguments[1] if arguments[1]
raise Puppet::ParseError, "prefix(): expected second argument to be a String, got #{prefix.inspect}" if prefix && !prefix.is_a?(String)
result = if enumerable.is_a?(Array)
# Turn everything into string same as join would do ...
enumerable.map do |i|
i = i.to_s
prefix ? prefix + i : i
end
else
enumerable.to_h do |k, v|
k = k.to_s
[prefix ? prefix + k : k, v]
end
end
return result
end
end
# vim: set ts=2 sw=2 et :
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