--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/stdlib/lib/puppet/parser/functions/validate_numeric.rb	Fri Jan 03 19:56:04 2020 +0000
@@ -0,0 +1,99 @@
+#
+# validate_numeric.rb
+#
+module Puppet::Parser::Functions
+  newfunction(:validate_numeric, :doc => <<-'DOC') do |args|
+    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.
+
+    DOC
+
+    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.'])
+
+    # 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.empty? && 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 && 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 && max && 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 = ->(num) do
+      # check input < max
+      if max && 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 && 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
+end