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|
#!/usr/local/bin/ruby -w
# $Id$
require 'puppet'
require 'puppet/fact'
module Puppet
#---------------------------------------------------------------
# this class will provide something like a 'select' statement, but it will
# return a value
# it will be used something like this:
# value = Selector.new(
# proc { test() } => value,
# proc { test2() } => value2,
# )
# each test gets evaluated in turn; the first one to return true has its
# value returned as the value of the statement
# this will be used to provide abstraction in objects, but it's currently
# unused
class Selector < Array
attr_accessor :default
def add(value,&block)
option = Option.new(value,&block)
@ohash[value] = option
@oarray.push(option)
end
def evaluate
@oarray.each { |option|
if option.true?
return option.value
end
}
return nil
end
# we have to support providing different values based on
# different criteria, e.g., default is X, SunOS gets Y, and
# host Yayness gets Z.
# thus, no invariant
def initialize
@oarray = []
@ohash = {}
if block_given?
yield self
end
end
def to_s
return self.evaluate()
end
class Option
attr_accessor :value, :test, :invariant
def initialize(value,&block)
@value = value
@test = block
end
def to_s
if self.evaluate
return value
end
end
def true?
unless @test.is_a?(Proc)
raise "Cannot yet evaluate non-code tests"
end
return @test.call()
end
end
#---------------------------------------------------------------
end
end
|
