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author | Ken Barber <ken@bob.sh> | 2011-04-29 09:27:10 +0200 |
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committer | Ken Barber <ken@bob.sh> | 2011-04-30 15:59:31 +0200 |
commit | 99a93d366f2e1efb977fcc8fe300d3d8357c8214 (patch) | |
tree | fab7510323f123c83da6d7c6cae4fe9e3f2f1e27 /lib/puppet/parser/functions/shuffle.rb | |
parent | 781a8720577d0cafe2147f3a1b938db7bec31789 (diff) |
Convert to module format.
Diffstat (limited to 'lib/puppet/parser/functions/shuffle.rb')
-rw-r--r-- | lib/puppet/parser/functions/shuffle.rb | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/shuffle.rb b/lib/puppet/parser/functions/shuffle.rb new file mode 100644 index 0000000..73e798c --- /dev/null +++ b/lib/puppet/parser/functions/shuffle.rb @@ -0,0 +1,45 @@ +# +# shuffle.rb +# + +module Puppet::Parser::Functions + newfunction(:shuffle, :type => :rvalue, :doc => <<-EOS + EOS + ) do |arguments| + + raise(Puppet::ParseError, "shuffle(): Wrong number of arguments " + + "given (#{arguments.size} for 1)") if arguments.size < 1 + + value = arguments[0] + klass = value.class + + unless [Array, String].include?(klass) + raise(Puppet::ParseError, 'shuffle(): Requires either ' + + 'array or string to work with') + end + + result = value.clone + + string = value.is_a?(String) ? true : false + + # Check whether it makes sense to shuffle ... + return result if result.size <= 1 + + # We turn any string value into an array to be able to shuffle ... + result = string ? result.split('') : result + + elements = result.size + + # Simple implementation of Fisher–Yates in-place shuffle ... + elements.times do |i| + j = rand(elements - i) + i + result[j], result[i] = result[i], result[j] + end + + result = string ? result.join : result + + return result + end +end + +# vim: set ts=2 sw=2 et : |