module Puppet::Parser::Functions newfunction(:validate_numeric, :doc => <<-'ENDHEREDOC') 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. 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 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