/
flatten.rb
69 lines (54 loc) · 1.83 KB
/
flatten.rb
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#
# flatten.rb
#
# Copyright 2012 Krzysztof Wilczynski
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
module Puppet::Parser::Functions
newfunction(:flatten, :type => :rvalue, :doc => <<-EOS
Returns a new array that is a one-dimensional flat array resulting from
recursively merging of every sub-array present at any level of recursion.
Prototype:
flatten(a)
Where a is an array type.
For example:
Given the following statements:
$a = ['a']
$b = [$a, ['b', 'c']]
$c = [$b, 'd', 'e', 'f']
notice flatten($a)
notice flatten($b)
notice flatten($c)
The result will be as follows:
notice: Scope(Class[main]): a
notice: Scope(Class[main]): a b c
notice: Scope(Class[main]): a b c d e f
EOS
) do |*arguments|
#
# This is to ensure that whenever we call this function from within
# the Puppet manifest or alternatively form a template it will always
# do the right thing ...
#
arguments = arguments.shift if arguments.first.is_a?(Array)
raise Puppet::ParseError, "flatten(): Wrong number of arguments " +
"given (#{arguments.size} for 1)" if arguments.size < 1
array = arguments.shift
raise Puppet::ParseError, 'flatten(): Requires an array type ' +
'to work with' unless array.is_a?(Array)
array.flatten
end
end
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# encoding: utf-8