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# frozen_string_literal: true
#
# clamp.rb
#
module Puppet::Parser::Functions
newfunction(:clamp, type: :rvalue, arity: -2, doc: <<-DOC
@summary
Keeps value within the range [Min, X, Max] by sort based on integer value
(parameter order doesn't matter).
Strings are converted and compared numerically. Arrays of values are flattened
into a list for further handling.
@example Example usage
clamp('24', [575, 187])` returns 187.
clamp(16, 88, 661)` returns 88.
clamp([4, 3, '99'])` returns 4.
> *Note:*
From Puppet 6.0.0 this can be done with only core Puppet like this:
`[$minval, $maxval, $value_to_clamp].sort[1]`
@return [Array[Integer]] The sorted Array
DOC
) do |args|
args.flatten!
raise(Puppet::ParseError, 'clamp(): Wrong number of arguments, need three to clamp') if args.size != 3
# check values out
args.each do |value|
case [value.class]
when [String]
raise(Puppet::ParseError, "clamp(): Required explicit numeric (#{value}:String)") unless %r{^\d+$}.match?(value)
when [Hash]
raise(Puppet::ParseError, "clamp(): The Hash type is not allowed (#{value})")
end
end
# convert to numeric each element
# then sort them and get a middle value
args.map(&:to_i).sort[1]
end
end
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