to_bytes.rb
No OneTemporary
Actions

Size

1 KB

Subscribers

None

to_bytes.rb
View Options

	#
	# to_bytes.rb
	#
	module Puppet::Parser::Functions
	newfunction(:to_bytes, :type => :rvalue, :doc => <<-EOS
	Converts the argument into bytes, for example 4 kB becomes 4096.
	Takes a single string value as an argument.
	These conversions reflect a layperson's understanding of
	1 MB = 1024 KB, when in fact 1 MB = 1000 KB, and 1 MiB = 1024 KiB.
	EOS
	) do \|arguments\|

	raise(Puppet::ParseError, "to_bytes(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.size != 1

	arg = arguments[0]

	return arg if arg.is_a? Numeric

	value, prefix = %r{([0-9.e+-])\s*([^bB]?)}.match(arg)[1, 2]

	value = value.to_f
	case prefix
	when '' then return value.to_i
	when 'k' then return (value * (1 << 10)).to_i
	when 'M' then return (value * (1 << 20)).to_i
	when 'G' then return (value * (1 << 30)).to_i
	when 'T' then return (value * (1 << 40)).to_i
	when 'P' then return (value * (1 << 50)).to_i
	when 'E' then return (value * (1 << 60)).to_i
	else raise Puppet::ParseError, "to_bytes(): Unknown prefix #{prefix}"
	end
	end
	end