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# frozen_string_literal: true
#
# to_bytes.rb
#
module Puppet::Parser::Functions
newfunction(:to_bytes, type: :rvalue, doc: <<-DOC
@summary
Converts the argument into bytes, for example 4 kB becomes 4096.
@return
converted value into bytes
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.
DOC
) 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
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