Puppet Function: is_function_available

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

Overview

is_function_available() ⇒ Any

This function accepts a string as an argument, determines whether the Puppet runtime has access to a function by that name. It returns a true if the function exists, false if not.

Returns:

  • (Any) 


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# File 'puppet/modules/stdlib/lib/puppet/parser/functions/is_function_available.rb', line 6

newfunction(:is_function_available, :type => :rvalue, :doc => <<-EOS
This function accepts a string as an argument, determines whether the
Puppet runtime has access to a function by that name.  It returns a
true if the function exists, false if not.
  EOS
) do |arguments|

  if (arguments.size != 1) then
    raise(Puppet::ParseError, "is_function_available?(): Wrong number of arguments "+
      "given #{arguments.size} for 1")
  end

  # Only allow String types
  return false unless arguments[0].is_a?(String)

  function = Puppet::Parser::Functions.function(arguments[0].to_sym)
  function.is_a?(String) and not function.empty?
end