Puppet Function: validate_numeric

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

Overview

validate_numeric()Any

Validate that the first argument is a numeric value (or an array of numeric values). Abort catalog compilation if any of the checks fail.

The second argument is optional and passes a maximum. (All elements of) the first argument has to be less or equal to this max.

The third argument is optional and passes a minimum. (All elements of) the first argument has to be greater or equal to this min. If, and only if, a minimum is given, the second argument may be an empty string or undef, which will be handled to just check if (all elements of) the first argument are greater or equal to the given minimum.

It will fail if the first argument is not a numeric (Integer or Float) or array of numerics, and if arg 2 and arg 3 are not convertable to a numeric.

For passing and failing usage, see `validate_integer()`. It is all the same for validate_numeric, yet now floating point values are allowed, too.

Returns:

  • (Any)


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# File 'puppet/modules/stdlib/lib/puppet/parser/functions/validate_numeric.rb', line 3

newfunction(:validate_numeric, :doc => <<-'ENDHEREDOC') do |args|

  function_deprecation([:validate_numeric, 'This method is deprecated, please use the stdlib validate_legacy function, with Stdlib::Compat::Numeric. There is further documentation for validate_legacy function in the README.'])
  Validate that the first argument is a numeric value (or an array of numeric values). Abort catalog compilation if any of the checks fail.

  The second argument is optional and passes a maximum. (All elements of) the first argument has to be less or equal to this max.

  The third argument is optional and passes a minimum.  (All elements of) the first argument has to be greater or equal to this min.
  If, and only if, a minimum is given, the second argument may be an empty string or undef, which will be handled to just check
  if (all elements of) the first argument are greater or equal to the given minimum.

  It will fail if the first argument is not a numeric (Integer or Float) or array of numerics, and if arg 2 and arg 3 are not convertable to a numeric.

  For passing and failing usage, see `validate_integer()`. It is all the same for validate_numeric, yet now floating point values are allowed, too.

  ENDHEREDOC

  # tell the user we need at least one, and optionally up to two other parameters
  raise Puppet::ParseError, "validate_numeric(): Wrong number of arguments; must be 1, 2 or 3, got #{args.length}" unless args.length > 0 and args.length < 4

  input, max, min = *args

  # check maximum parameter
  if args.length > 1
    max = max.to_s
    # allow max to be empty (or undefined) if we have a minimum set
    if args.length > 2 and max == ''
      max = nil
    else
      begin
        max = Float(max)
      rescue TypeError, ArgumentError
        raise Puppet::ParseError, "validate_numeric(): Expected second argument to be unset or a Numeric, got #{max}:#{max.class}"
      end
    end
  else
    max = nil
  end

  # check minimum parameter
  if args.length > 2
    begin
      min = Float(min.to_s)
    rescue TypeError, ArgumentError
      raise Puppet::ParseError, "validate_numeric(): Expected third argument to be unset or a Numeric, got #{min}:#{min.class}"
    end
  else
    min = nil
  end

  # ensure that min < max
  if min and max and min > max
    raise Puppet::ParseError, "validate_numeric(): Expected second argument to be larger than third argument, got #{max} < #{min}"
  end

  # create lamba validator function
  validator = lambda do |num|
    # check input < max
    if max and num > max
      raise Puppet::ParseError, "validate_numeric(): Expected #{input.inspect} to be smaller or equal to #{max}, got #{input.inspect}."
    end
    # check input > min (this will only be checked if no exception has been raised before)
    if min and num < min
      raise Puppet::ParseError, "validate_numeric(): Expected #{input.inspect} to be greater or equal to #{min}, got #{input.inspect}."
    end
  end

  # if this is an array, handle it.
  case input
  when Array
    # check every element of the array
    input.each_with_index do |arg, pos|
      begin
        raise TypeError if arg.is_a?(Hash)
        arg = Float(arg.to_s)
        validator.call(arg)
      rescue TypeError, ArgumentError
        raise Puppet::ParseError, "validate_numeric(): Expected element at array position #{pos} to be a Numeric, got #{arg.class}"
      end
    end
  # for the sake of compatibility with ruby 1.8, we need extra handling of hashes
  when Hash
    raise Puppet::ParseError, "validate_integer(): Expected first argument to be a Numeric or Array, got #{input.class}"
  # check the input. this will also fail any stuff other than pure, shiny integers
  else
    begin
      input = Float(input.to_s)
      validator.call(input)
    rescue TypeError, ArgumentError
      raise Puppet::ParseError, "validate_numeric(): Expected first argument to be a Numeric or Array, got #{input.class}"
    end
  end
end