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#
# prefix.rb
#
module Puppet::Parser::Functions
newfunction(:prefix, :type => :rvalue, :doc => <<-EOS
This function applies a prefix to all elements in an array or a hash.
*Examples:*
prefix(['a','b','c'], 'p')
Will return: ['pa','pb','pc']
EOS
) 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.size < 1
enumerable = arguments[0]
unless enumerable.is_a?(Array) or enumerable.is_a?(Hash)
raise Puppet::ParseError, "prefix(): expected first argument to be an Array or a Hash, got #{enumerable.inspect}"
end
prefix = arguments[1] if arguments[1]
if prefix
unless prefix.is_a?(String)
raise Puppet::ParseError, "prefix(): expected second argument to be a String, got #{prefix.inspect}"
end
end
if enumerable.is_a?(Array)
# Turn everything into string same as join would do ...
result = enumerable.collect do |i|
i = i.to_s
prefix ? prefix + i : i
end
else
result = Hash[enumerable.map 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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