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|
#
# collect_indices.rb
#
module Puppet::Parser::Functions
newfunction(:collect_indices, :type => :rvalue, :doc => <<-EOS
EOS
) do |arguments|
raise(Puppet::ParseError, "collect_indices(): Wrong number of " +
"arguments given (#{arguments.size} for 2)") if arguments.size < 2
array = arguments.shift
array_size = array.size
if not array.is_a?(Array)
raise(Puppet::ParseError, 'collect_indices(): Requires an array ' +
'to work with')
end
indices = *arguments # Get them all ... Pokemon ...
if not indices or indices.empty?
raise(Puppet::ParseError, 'collect_indices(): You must provide ' +
'indices to collect')
end
indices_list = []
indices.each do |i|
if m = i.match(/^(\d+)\-(\d+)$/)
start = m[1].to_i
stop = m[2].to_i
if start > stop
raise(Puppet::ParseError, 'collect_indices(): Stop index in ' +
'given indices range is smaller than the start index')
elsif stop > array_size - 1 # First element is at index 0 is it not?
raise(Puppet::ParseError, 'collect_indices(): Stop index in ' +
'given indices range exceeds array size')
end
(start .. stop).each { |i| indices_list << i.to_i }
else
# Only positive numbers allowed in this case ...
if not i.match(/^\d+$/)
raise(Puppet::ParseError, 'collect_indices(): Unknown format ' +
'of given index')
end
# In Puppet numbers are often string-encoded ...
i = i.to_i
if i > array_size - 1 # Same story. First element is at index 0 ...
raise(Puppet::ParseError, 'collect_indices(): Given index ' +
'exceeds array size')
end
indices_list << i
end
end
array = indices_list.collect { |i| array[i] }.compact
return array
end
end
# vim: set ts=2 sw=2 et :
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