4 module Puppet::Parser::Functions
5 newfunction(:to_bytes, :type => :rvalue, :doc => <<-DOC
6 Converts the argument into bytes, for example 4 kB becomes 4096.
7 Takes a single string value as an argument.
8 These conversions reflect a layperson's understanding of
9 1 MB = 1024 KB, when in fact 1 MB = 1000 KB, and 1 MiB = 1024 KiB.
13 raise(Puppet::ParseError, "to_bytes(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.size != 1
17 return arg if arg.is_a? Numeric
19 value, prefix = *%r{([0-9.e+-]*)\s*([^bB]?)}.match(arg)[1, 2]
23 when '' then return value.to_i
24 when 'k' then return (value * (1 << 10)).to_i
25 when 'M' then return (value * (1 << 20)).to_i
26 when 'G' then return (value * (1 << 30)).to_i
27 when 'T' then return (value * (1 << 40)).to_i
28 when 'P' then return (value * (1 << 50)).to_i
29 when 'E' then return (value * (1 << 60)).to_i
30 else raise Puppet::ParseError, "to_bytes(): Unknown prefix #{prefix}"