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#
# zip.rb
#
module Puppet::Parser::Functions
newfunction(:zip, :type => :rvalue, :doc => <<-EOS
Takes one element from first array and merges corresponding elements from second array. This generates a sequence of n-element arrays, where n is one more than the count of arguments.
*Example:*
zip(['1','2','3'],['4','5','6'])
Would result in:
["1", "4"], ["2", "5"], ["3", "6"]
EOS
) do |arguments|
# Technically we support three arguments but only first is mandatory ...
raise(Puppet::ParseError, "zip(): Wrong number of arguments " +
"given (#{arguments.size} for 2)") if arguments.size < 2
a = arguments[0]
b = arguments[1]
unless a.is_a?(Array) and b.is_a?(Array)
raise(Puppet::ParseError, 'zip(): Requires array to work with')
end
flatten = arguments[2] if arguments[2]
if flatten
klass = flatten.class
# We can have either true or false, or string which resembles boolean ...
unless [FalseClass, TrueClass, String].include?(klass)
raise(Puppet::ParseError, 'zip(): Requires either ' +
'boolean or string to work with')
end
if flatten.is_a?(String)
# We consider all the yes, no, y, n and so on too ...
flatten = case flatten
#
# This is how undef looks like in Puppet ...
# We yield false in this case.
#
when /^$/, '' then false # Empty string will be false ...
when /^(1|t|y|true|yes)$/ then true
when /^(0|f|n|false|no)$/ then false
when /^(undef|undefined)$/ then false # This is not likely to happen ...
else
raise(Puppet::ParseError, 'zip(): Unknown type of boolean given')
end
end
end
result = a.zip(b)
result = flatten ? result.flatten : result
return result
end
end
# vim: set ts=2 sw=2 et :
|
