Puppet Function: clamp

Defined in:
vendor_modules/stdlib/lib/puppet/parser/functions/clamp.rb
Function type:
Ruby 3.x API

Summary

Keeps value within the range [Min, X, Max] by sort based on integer value (parameter order doesn't matter).

Overview

clamp() ⇒ Array[Integer]

Strings are converted and compared numerically. Arrays of values are flattened into a list for further handling.

> Note:

From Puppet 6.0.0 this can be done with only core Puppet like this:
`[$minval, $maxval, $value_to_clamp].sort[1]`

Examples:

Example usage


clamp('24', [575, 187])` returns 187.
clamp(16, 88, 661)` returns 88.
clamp([4, 3, '99'])` returns 4.

Returns:

  • (Array[Integer]) —

    The sorted Array



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# File 'vendor_modules/stdlib/lib/puppet/parser/functions/clamp.rb', line 7

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 { |n| n.to_i }.sort[1]
end