Puppet Function: str2bool

Defined in:
lib/puppet/parser/functions/str2bool.rb
Function type:
Ruby 3.x API

Overview

str2bool() ⇒ Any

This converts a string to a boolean. This attempt to convert strings that contain things like: Y,y, 1, T,t, TRUE,true to ‘true’ and strings that contain things like: 0, F,f, N,n, false, FALSE, no to ‘false’.

Returns:

  • (Any) 


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# File 'lib/puppet/parser/functions/str2bool.rb', line 5

newfunction(:str2bool, :type => :rvalue, :doc => <<-DOC
  This converts a string to a boolean. This attempt to convert strings that
  contain things like: Y,y, 1, T,t, TRUE,true to 'true' and strings that contain things
  like: 0, F,f, N,n, false, FALSE, no to 'false'.
DOC
           ) do |arguments|

  raise(Puppet::ParseError, "str2bool(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.empty?

  string = arguments[0]

  # If string is already Boolean, return it
  if !!string == string # rubocop:disable Style/DoubleNegation : No viable alternative
    return string
  end

  unless string.is_a?(String)
    raise(Puppet::ParseError, 'str2bool(): Requires string to work with')
  end

  # We consider all the yes, no, y, n and so on too ...
  result = case string
           #
           # This is how undef looks like in Puppet ...
           # We yield false in this case.
           #
           when %r{^$}, '' then false # Empty string will be false ...
           when %r{^(1|t|y|true|yes)$}i  then true
           when %r{^(0|f|n|false|no)$}i  then false
           when %r{^(undef|undefined)$} then false # This is not likely to happen ...
           else
             raise(Puppet::ParseError, 'str2bool(): Unknown type of boolean given')
           end

  return result
end